3GPP TS 36.322 V10.0.0 (2010-12)
Technical Specification
3rd Generation Partnership Project;
Technical Specification Group Radio Access Network;
Evolved Universal Terrestrial Radio Access (E-UTRA);
Radio Link Control (RLC) protocol specification
(Release 10)
The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.
The present document has not been subject to any approval process by the 3GPP Organisational Partners and shall not be implemented.
This Specification is provided for future development work within 3GPP only. The Organisational Partners accept no liability for any use of this Specification.
Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organisational Partners' Publications Offices.
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Keywords
UMTS, radio
3GPP
Postal address
3GPP support office address
650 Route des Lucioles - Sophia Antipolis
Valbonne - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
Internet
http://www.3gpp.org
Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© 2010, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC).
All rights reserved.
UMTS™ is a Trade Mark of ETSI registered for the benefit of its members
3GPP™ is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners
LTE™ is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partners
GSM® and the GSM logo are registered and owned by the GSM Association
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Contents
Foreword ............................................................................................................................................................5
1
Scope ........................................................................................................................................................6
2
References ................................................................................................................................................6
3
Definitions, symbols and abbreviations ...................................................................................................6
3.1
3.2
4
Definitions ......................................................................................................................................................... 6
Abbreviations..................................................................................................................................................... 6
General .....................................................................................................................................................7
4.1
4.2
4.2.1
4.2.1.1
4.2.1.1.1
4.2.1.1.2
4.2.1.1.3
4.2.1.2
4.2.1.2.1
4.2.1.2.2
4.2.1.2.3
4.2.1.3
4.2.1.3.1
4.2.1.3.2
4.2.1.3.3
4.3
4.3.1
4.3.2
4.4
4.5
5
Introduction........................................................................................................................................................ 7
RLC architecture................................................................................................................................................ 7
RLC entities ................................................................................................................................................. 7
TM RLC entity ....................................................................................................................................... 9
General.............................................................................................................................................. 9
Transmitting TM RLC entity ............................................................................................................ 9
Receiving TM RLC entity................................................................................................................. 9
UM RLC entity....................................................................................................................................... 9
General.............................................................................................................................................. 9
Transmitting UM RLC entity.......................................................................................................... 10
Receiving UM RLC entity .............................................................................................................. 10
AM RLC entity..................................................................................................................................... 11
General............................................................................................................................................ 11
Transmitting side ............................................................................................................................ 11
Receiving side................................................................................................................................. 12
Services............................................................................................................................................................ 12
Services provided to upper layers .............................................................................................................. 12
Services expected from lower layers.......................................................................................................... 12
Functions.......................................................................................................................................................... 12
Data available for transmission........................................................................................................................ 13
Procedures ..............................................................................................................................................13
5.1
Data transfer procedures .................................................................................................................................. 13
5.1.1
TM data transfer......................................................................................................................................... 13
5.1.1.1
Transmit operations .............................................................................................................................. 13
5.1.1.1.1
General............................................................................................................................................ 13
5.1.1.2
Receive operations................................................................................................................................ 13
5.1.1.2.1
General............................................................................................................................................ 13
5.1.2
UM data transfer ........................................................................................................................................ 13
5.1.2.1
Transmit operations .............................................................................................................................. 13
5.1.2.1.1
General............................................................................................................................................ 13
5.1.2.2
Receive operations................................................................................................................................ 13
5.1.2.2.1
General............................................................................................................................................ 13
5.1.2.2.2
Actions when an UMD PDU is received from lower layer............................................................. 14
5.1.2.2.3
Actions when an UMD PDU is placed in the reception buffer ....................................................... 14
5.1.2.2.4
Actions when t-Reordering expires ................................................................................................ 15
5.1.3
AM data transfer ........................................................................................................................................ 15
5.1.3.1
Transmit operations .............................................................................................................................. 15
5.1.3.1.1
General............................................................................................................................................ 15
5.1.3.2
Receive operations................................................................................................................................ 15
5.1.3.2.1
General............................................................................................................................................ 15
5.1.3.2.2
Actions when a RLC data PDU is received from lower layer......................................................... 16
5.1.3.2.3
Actions when a RLC data PDU is placed in the reception buffer ................................................... 16
5.1.3.2.4
Actions when t-Reordering expires ................................................................................................ 17
5.2
ARQ procedures .............................................................................................................................................. 17
5.2.1
Retransmission ........................................................................................................................................... 17
5.2.2
Polling ........................................................................................................................................................ 18
5.2.2.1
Transmission of a AMD PDU or AMD PDU segment......................................................................... 18
5.2.2.2
Reception of a STATUS report ............................................................................................................ 18
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5.2.3
5.3
5.4
5.5
5.5.1
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Expiry of t-PollRetransmit ................................................................................................................... 19
Status reporting .......................................................................................................................................... 19
SDU discard procedures .................................................................................................................................. 20
Re-establishment procedure............................................................................................................................. 20
Handling of unknown, unforeseen and erroneous protocol data...................................................................... 21
Reception of PDU with reserved or invalid values .................................................................................... 21
Protocol data units, formats and parameters ..........................................................................................21
6.1
Protocol data units ........................................................................................................................................... 21
6.1.1
RLC data PDU ........................................................................................................................................... 21
6.1.2
RLC control PDU....................................................................................................................................... 21
6.2
Formats and parameters ................................................................................................................................... 21
6.2.1
Formats....................................................................................................................................................... 21
6.2.1.1
General ................................................................................................................................................. 21
6.2.1.2
TMD PDU ............................................................................................................................................ 22
6.2.1.3
UMD PDU............................................................................................................................................ 22
6.2.1.4
AMD PDU............................................................................................................................................ 24
6.2.1.5
AMD PDU segment ............................................................................................................................. 25
6.2.1.6
STATUS PDU ...................................................................................................................................... 27
6.2.2
Parameters .................................................................................................................................................. 27
6.2.2.1
General ................................................................................................................................................. 27
6.2.2.2
Data field .............................................................................................................................................. 28
6.2.2.3
Sequence Number (SN) field................................................................................................................ 28
6.2.2.4
Extension bit (E) field........................................................................................................................... 28
6.2.2.5
Length Indicator (LI) field.................................................................................................................... 28
6.2.2.6
Framing Info (FI) field ......................................................................................................................... 29
6.2.2.7
Segment Offset (SO) field .................................................................................................................... 29
6.2.2.8
Last Segment Flag (LSF) field ............................................................................................................. 29
6.2.2.9
Data/Control (D/C) field....................................................................................................................... 29
6.2.2.10
Re-segmentation Flag (RF) field .......................................................................................................... 29
6.2.2.11
Polling bit (P) field ............................................................................................................................... 30
6.2.2.12
Reserved 1 (R1) field............................................................................................................................ 30
6.2.2.13
Control PDU Type (CPT) field............................................................................................................. 30
6.2.2.14
Acknowledgement SN (ACK_SN) field............................................................................................... 30
6.2.2.15
Extension bit 1 (E1) field...................................................................................................................... 30
6.2.2.16
Negative Acknowledgement SN (NACK_SN) field ............................................................................ 31
6.2.2.17
Extension bit 2 (E2) field...................................................................................................................... 31
6.2.2.18
SO start (SOstart) field ......................................................................................................................... 31
6.2.2.19
SO end (SOend) field ........................................................................................................................... 31
7
7.1
7.2
7.3
7.4
Variables, constants and timers ..............................................................................................................31
State variables.................................................................................................................................................. 31
Constants.......................................................................................................................................................... 33
Timers .............................................................................................................................................................. 33
Configurable parameters.................................................................................................................................. 34
Annex A (informative):
Change history ...............................................................................................35
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Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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Scope
The present document specifies the E-UTRA Radio Link Control (RLC) protocol for the UE – E-UTRAN radio interface.
The specification describes:
-
E-UTRA RLC sublayer architecture;
-
E-UTRA RLC entities;
-
services expected from lower layers by E-UTRA RLC;
-
services provided to upper layers by E-UTRA RLC;
-
E-UTRA RLC functions;
-
elements for peer-to-peer E-UTRA RLC communication including protocol data units, formats and parameters;
-
handling of unknown, unforeseen and erroneous protocol data at E-UTRA RLC.
2
References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
 References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
 For a specific reference, subsequent revisions do not apply.
 For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a
GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1]
3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
3GPP TS 36.300: "E-UTRA and E-UTRAN Overall Description; Stage 2".
[3]
3GPP TS 36.321: "E-UTRA MAC protocol specification".
[4]
3GPP TS 36.323: "E-UTRA PDCP specification".
[5]
3GPP TS 36.331: "E-UTRA RRC Protocol specification".
3
Definitions, symbols and abbreviations
3.1
Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1] and the following apply. A
term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 [1].
byte segment: A byte of the Data field of an AMD PDU. Specifically, byte segment number 0 corresponds to the first
byte of the Data field of an AMD PDU.
Data field element: An RLC SDU or an RLC SDU segment that is mapped to the Data field.
RLC SDU segment: A segment of an RLC SDU.
3.2
Abbreviations
For the purposes of the present document, the following abbreviations apply:
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AM
AMD
ARQ
BCCH
BCH
CCCH
DCCH
DL
DL-SCH
DTCH
E
eNB
E-UTRA
E-UTRAN
FI
HARQ
LI
LSF
MAC
MCCH
MTCH
PCCH
PDU
RLC
RRC
SAP
SDU
SN
SO
TB
TM
TMD
UE
UL
UM
UMD
3GPP TS 36.322 V10.0.0 (2010-12)
Acknowledged Mode
AM Data
Automatic Repeat reQuest
Broadcast Control CHannel
Broadcast CHannel
Common Control CHannel
Dedicated Control CHannel
DownLink
DL-Shared CHannel
Dedicated Traffic CHannel
Extension bit
E-UTRAN Node B
Evolved UMTS Terrestrial Radio Access
Evolved UMTS Terrestrial Radio Access Network
Framing Info
Hybrid ARQ
Length Indicator
Last Segment Flag
Medium Access Control
Multicast Control Channel
Multicast Traffic Channel
Paging Control CHannel
Protocol Data Unit
Radio Link Control
Radio Resource Control
Service Access Point
Service Data Unit
Sequence Number
Segment Offset
Transport Block
Transparent Mode
TM Data
User Equipment
UpLink
Unacknowledged Mode
UM Data
4
General
4.1
Introduction
The objective is to describe the RLC architecture and the RLC entities from a functional point of view.
4.2
RLC architecture
4.2.1
RLC entities
The description in this sub clause is a model and does not specify or restrict implementations.
RRC is generally in control of the RLC configuration.
Functions of the RLC sub layer are performed by RLC entities. For a RLC entity configured at the eNB, there is a peer
RLC entity configured at the UE and vice versa.
An RLC entity receives/delivers RLC SDUs from/to upper layer and sends/receives RLC PDUs to/from its peer RLC
entity via lower layers. An RLC PDU can either be a RLC data PDU (see sub clause 6.1.1) or a RLC control PDU (see
sub clause 6.1.2). If an RLC entity receives RLC SDUs from upper layer, it receives them through a single SAP
between RLC and upper layer, and after forming RLC data PDUs from the received RLC SDUs, the RLC entity
delivers the RLC data PDUs to lower layer through a single logical channel. If an RLC entity receives RLC data PDUs
from lower layer, it receives them through a single logical channel, and after forming RLC SDUs from the received
RLC data PDUs, the RLC entity delivers the RLC SDUs to upper layer through a single SAP between RLC and upper
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layer. If an RLC entity delivers/receives RLC control PDUs to/from lower layer, it delivers/receives them through the
same logical channel it delivers/receives the RLC data PDUs through.
An RLC entity can be configured to perform data transfer in one of the following three modes: Transparent Mode (TM),
Unacknowledged Mode (UM) or Acknowledged Mode (AM). Consequently, an RLC entity is categorized as a TM
RLC entity, an UM RLC entity or an AM RLC entity depending on the mode of data transfer that the RLC entity is
configured to provide.
A TM RLC entity is configured either as a transmitting TM RLC entity or a receiving TM RLC entity. The transmitting
TM RLC entity receives RLC SDUs from upper layer and sends RLC PDUs to its peer receiving TM RLC entity via
lower layers. The receiving TM RLC entity delivers RLC SDUs to upper layer and receives RLC PDUs from its peer
transmitting TM RLC entity via lower layers.
An UM RLC entity is configured either as a transmitting UM RLC entity or a receiving UM RLC entity. The
transmitting UM RLC entity receives RLC SDUs from upper layer and sends RLC PDUs to its peer receiving UM RLC
entity via lower layers. The receiving UM RLC entity delivers RLC SDUs to upper layer and receives RLC PDUs from
its peer transmitting UM RLC entity via lower layers.
An AM RLC entity consists of a transmitting side and a receiving side. The transmitting side of an AM RLC entity
receives RLC SDUs from upper layer and sends RLC PDUs to its peer AM RLC entity via lower layers. The receiving
side of an AM RLC entity delivers RLC SDUs to upper layer and receives RLC PDUs from its peer AM RLC entity via
lower layers.
Figure 1 illustrates the overview model of the RLC sub layer.
Figure 4.2.1-1: Overview model of the RLC sub layer
The following applies to all RLC entity types (i.e. TM, UM and AM RLC entity):
-
RLC SDUs of variable sizes which are byte aligned (i.e. multiple of 8 bits) are supported;
-
RLC PDUs are formed only when a transmission opportunity has been notified by lower layer (i.e. by MAC) and
are then delivered to lower layer.
Description of different RLC entity types are provided below.
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TM RLC entity
4.2.1.1.1
General
A TM RLC entity can be configured to deliver/receive RLC PDUs through the following logical channels:
-
BCCH, DL/UL CCCH and PCCH.
UE/ENB
ENB/UE
radio interface
TM-SAP
TM-SAP
Transmission
buffer
Transmitting
TM-RLC
entity
Receiving
TM-RLC
entity
BCCH/PCCH/CCCH
BCCH/PCCH/CCCH
Figure 4.2.1.1.1-1: Model of two transparent mode peer entities
A TM RLC entity delivers/receives the following RLC data PDU:
-
TMD PDU.
4.2.1.1.2
Transmitting TM RLC entity
When a transmitting TM RLC entity forms TMD PDUs from RLC SDUs, it shall:
-
not segment nor concatenate the RLC SDUs;
-
not include any RLC headers in the TMD PDUs.
4.2.1.1.3
Receiving TM RLC entity
When a receiving TM RLC entity receives TMD PDUs, it shall:
-
deliver the TMD PDUs (which are just RLC SDUs) to upper layer.
4.2.1.2
4.2.1.2.1
UM RLC entity
General
An UM RLC entity can be configured to deliver/receive RLC PDUs through the following logical channels:
-
DL/UL DTCH, MCCH or MTCH.
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Figure 4.2.1.2.1-1: Model of two unacknowledged mode peer entities
An UM RLC entity delivers/receives the following RLC data PDU:
-
UMD PDU.
NOTE:
4.2.1.2.2
HARQ reordering is not applicable for MCCH or MTCH reception.
Transmitting UM RLC entity
When a transmitting UM RLC entity forms UMD PDUs from RLC SDUs, it shall:
-
segment and/or concatenate the RLC SDUs so that the UMD PDUs fit within the total size of RLC PDU(s)
indicated by lower layer at the particular transmission opportunity notified by lower layer;
-
include relevant RLC headers in the UMD PDU.
4.2.1.2.3
Receiving UM RLC entity
When a receiving UM RLC entity receives UMD PDUs, it shall:
-
detect whether or not the UMD PDUs have been received in duplication, and discard duplicated UMD PDUs;
-
reorder the UMD PDUs if they are received out of sequence;
-
detect the loss of UMD PDUs at lower layers and avoid excessive reordering delays;
-
reassemble RLC SDUs from the reordered UMD PDUs (not accounting for RLC PDUs for which losses have
been detected) and deliver the RLC SDUs to upper layer in ascending order of the RLC SN;
-
discard received UMD PDUs that cannot be re-assembled into a RLC SDU due to loss at lower layers of an
UMD PDU which belonged to the particular RLC SDU.
At the time of RLC re-establishment, the receiving UM RLC entity shall:
-
if possible, reassemble RLC SDUs from the UMD PDUs that are received out of sequence and deliver them to
upper layer;
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discard any remaining UMD PDUs that could not be reassembled into RLC SDUs;
-
initialize relevant state variables and stop relevant timers.
4.2.1.3
AM RLC entity
4.2.1.3.1
General
An AM RLC entity can be configured to deliver/receive RLC PDUs through the following logical channels:
-
DL/UL DCCH or DL/UL DTCH.
AM-SAP
Transmission
buffer
RLC control
SDU reassembly
Remove RLC header
Segmentation &
Concatenation
Retransmission
buffer
Reception
buffer & HARQ
reordering
Add RLC header
Routing
DCCH/DTCH
DCCH/DTCH
Figure 4.2.1.3.1-1: Model of an acknowledged mode enttiy
An AM RLC entity delivers/receives the following RLC data PDUs:
-
AMD PDU;
-
AMD PDU segment.
An AM RLC entity delivers/receives the following RLC control PDU:
-
STATUS PDU.
4.2.1.3.2
Transmitting side
When the transmitting side of an AM RLC entity forms AMD PDUs from RLC SDUs, it shall:
-
segment and/or concatenate the RLC SDUs so that the AMD PDUs fit within the total size of RLC PDU(s)
indicated by lower layer at the particular transmission opportunity notified by lower layer.
The transmitting side of an AM RLC entity supports retransmission of RLC data PDUs (ARQ):
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if the RLC data PDU to be retransmitted does not fit within the total size of RLC PDU(s) indicated by lower
layer at the particular transmission opportunity notified by lower layer, the AM RLC entity can re-segment the
RLC data PDU into AMD PDU segments;
-
the number of re-segmentation is not limited.
When the transmitting side of an AM RLC entity forms AMD PDUs from RLC SDUs received from upper layer or
AMD PDU segments from RLC data PDUs to be retransmitted, it shall:
-
include relevant RLC headers in the RLC data PDU.
4.2.1.3.3
Receiving side
When the receiving side of an AM RLC entity receives RLC data PDUs, it shall:
-
detect whether or not the RLC data PDUs have been received in duplication, and discard duplicated RLC data
PDUs;
-
reorder the RLC data PDUs if they are received out of sequence;
-
detect the loss of RLC data PDUs at lower layers and request retransmissions to its peer AM RLC entity;
-
reassemble RLC SDUs from the reordered RLC data PDUs and deliver the RLC SDUs to upper layer in
sequence.
At the time of RLC re-establishment, the receiving side of an AM RLC entity shall:
-
if possible, reassemble RLC SDUs from the RLC data PDUs that are received out of sequence and deliver them
to upper layer;
-
discard any remaining RLC data PDUs that could not be reassembled into RLC SDUs;
-
initialize relevant state variables and stop relevant timers.
4.3
Services
4.3.1
Services provided to upper layers
The following services are provided by RLC to upper layer:
-
TM data transfer;
-
UM data transfer;
-
AM data transfer, including indication of successful delivery of upper layers PDUs.
4.3.2
Services expected from lower layers
The following services are expected by RLC from lower layer (i.e. MAC):
-
data transfer;
-
notification of a transmission opportunity, together with the total size of the RLC PDU(s) to be transmitted in the
transmission opportunity.
4.4
Functions
The following functions are supported by the RLC sub layer:
-
transfer of upper layer PDUs;
-
error correction through ARQ (only for AM data transfer);
-
concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer);
-
re-segmentation of RLC data PDUs (only for AM data transfer);
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reordering of RLC data PDUs (only for UM and AM data transfer);
-
duplicate detection (only for UM and AM data transfer);
-
RLC SDU discard (only for UM and AM data transfer);
-
RLC re-establishment;
-
Protocol error detection (only for AM data transfer).
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Data available for transmission
For the purpose of MAC buffer status reporting, the UE shall consider the following as data available for transmission
in the RLC layer:
-
RLC SDUs, or segments thereof, that have not yet been included in an RLC data PDU;
-
RLC data PDUs, or portions thereof, that are pending for retransmission (RLC AM).
In addition, if a STATUS PDU has been triggered and t-StatusProhibit is not running or has expired, the UE shall
estimate the size of the STATUS PDU that will be transmitted in the next transmission opportunity, and consider this as
data available for transmission in the RLC layer.
5
Procedures
5.1
Data transfer procedures
5.1.1
TM data transfer
5.1.1.1
5.1.1.1.1
Transmit operations
General
When submitting a new TMD PDU to lower layer, the transmitting TM RLC entity shall:
-
submit a RLC SDU without any modification to lower layer.
5.1.1.2
5.1.1.2.1
Receive operations
General
When receiving a new TMD PDU from lower layer, the receiving TM RLC entity shall:
-
deliver the TMD PDU without any modification to upper layer.
5.1.2
5.1.2.1
5.1.2.1.1
UM data transfer
Transmit operations
General
When delivering a new UMD PDU to lower layer, the transmitting UM RLC entity shall:
-
set the SN of the UMD PDU to VT(US), and then increment VT(US) by one.
5.1.2.2
5.1.2.2.1
Receive operations
General
The receiving UM RLC entity shall maintain a reordering window according to state variable VR(UH) as follows:
-
a SN falls within the reordering window if (VR(UH) – UM_Window_Size) <= SN < VR(UH);
-
a SN falls outside of the reordering window otherwise.
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When receiving an UMD PDU from lower layer, the receiving UM RLC entity shall:
-
either discard the received UMD PDU or place it in the reception buffer (see sub clause 5.1.2.2.2);
-
if the received UMD PDU was placed in the reception buffer:
-
update state variables, reassemble and deliver RLC SDUs to upper layer and start/stop t-Reordering as
needed (see sub clause 5.1.2.2.3);
When t-Reordering expires, the receiving UM RLC entity shall:
-
update state variables, reassemble and deliver RLC SDUs to upper layer and start t-Reordering as needed (see
sub clause 5.1.2.2.4).
5.1.2.2.2
Actions when an UMD PDU is received from lower layer
When an UMD PDU with SN = x is received from lower layer, the receiving UM RLC entity shall:
-
if VR(UR) < x < VR(UH) and the UMD PDU with SN = x has been received before; or
-
if (VR(UH) – UM_Window_Size) <= x < VR(UR):
-
-
discard the received UMD PDU;
else:
-
place the received UMD PDU in the reception buffer.
5.1.2.2.3
Actions when an UMD PDU is placed in the reception buffer
When an UMD PDU with SN = x is placed in the reception buffer, the receiving UM RLC entity shall:
-
if x falls outside of the reordering window:
-
update VR(UH) to x + 1;
-
reassemble RLC SDUs from any UMD PDUs with SN that falls outside of the reordering window, remove
RLC headers when doing so and deliver the reassembled RLC SDUs to upper layer in ascending order of the
RLC SN if not delivered before;
-
if VR(UR) falls outside of the reordering window:
-
-
-
if the reception buffer contains an UMD PDU with SN = VR(UR):
-
update VR(UR) to the SN of the first UMD PDU with SN > current VR(UR) that has not been received;
-
reassemble RLC SDUs from any UMD PDUs with SN < updated VR(UR), remove RLC headers when doing
so and deliver the reassembled RLC SDUs to upper layer in ascending order of the RLC SN if not delivered
before;
if t-Reordering is running:
-
if VR(UX) <= VR(UR); or
-
if VR(UX) falls outside of the reordering window and VR(UX) is not equal to VR(UH)::
-
-
set VR(UR) to (VR(UH) – UM_Window_Size);
stop and reset t-Reordering;
if t-Reordering is not running (includes the case when t-Reordering is stopped due to actions above):
-
if VR(UH) > VR(UR):
-
start t-Reordering;
-
set VR(UX) to VR(UH).
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Actions when t-Reordering expires
When t-Reordering expires, the receiving UM RLC entity shall:
-
update VR(UR) to the SN of the first UMD PDU with SN >= VR(UX) that has not been received;
-
reassemble RLC SDUs from any UMD PDUs with SN < updated VR(UR), remove RLC headers when doing so
and deliver the reassembled RLC SDUs to upper layer in ascending order of the RLC SN if not delivered before;
-
if VR(UH) > VR(UR):
-
start t-Reordering;
-
set VR(UX) to VR(UH).
5.1.3
AM data transfer
5.1.3.1
Transmit operations
5.1.3.1.1
General
The transmitting side of an AM RLC entity shall prioritize transmission of RLC control PDUs over RLC data PDUs.
The transmitting side of an AM RLC entity shall prioritize retransmission of RLC data PDUs over transmission of new
AMD PDUs.
The transmitting side of an AM RLC entity shall maintain a transmitting window according to state variables VT(A)
and VT(MS) as follows:
-
a SN falls within the transmitting window if VT(A) <= SN < VT(MS);
-
a SN falls outside of the transmitting window otherwise.
The transmitting side of an AM RLC entity shall not deliver to lower layer any RLC data PDU whose SN falls outside
of the transmitting window.
When delivering a new AMD PDU to lower layer, the transmitting side of an AM RLC entity shall:
-
set the SN of the AMD PDU to VT(S), and then increment VT(S) by one.
The transmitting side of an AM RLC entity can receive a positive acknowledgement (confirmation of successful
reception by its peer AM RLC entity) for a RLC data PDU by the following:
-
STATUS PDU from its peer AM RLC entity.
When receiving a positive acknowledgement for an AMD PDU with SN = VT(A), the transmitting side of an AM RLC
entity shall:
-
set VT(A) equal to the SN of the AMD PDU with the smallest SN, whose SN falls within the range VT(A) <=
SN <= VT(S) and for which a positive acknowledgment has not been received yet.
-
if positive acknowledgements have been received for all AMD PDUs associated with a transmitted RLC SDU:
-
send an indication to the upper layers of successful delivery of the RLC SDU.
5.1.3.2
5.1.3.2.1
Receive operations
General
The receiving side of an AM RLC entity shall maintain a receiving window according to state variables VR(R) and
VR(MR) as follows:
-
a SN falls within the receiving window if VR(R) <= SN < VR(MR);
-
a SN falls outside of the receiving window otherwise.
When receiving a RLC data PDU from lower layer, the receiving side of an AM RLC entity shall:
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either discard the received RLC data PDU or place it in the reception buffer (see sub clause 5.1.3.2.2);
-
if the received RLC data PDU was placed in the reception buffer:
-
update state variables, reassemble and deliver RLC SDUs to upper layer and start/stop t-Reordering as
needed (see sub clause 5.1.3.2.3).
When t-Reordering expires, the receiving side of an AM RLC entity shall:
-
update state variables and start t-Reordering as needed (see sub clause 5.1.3.2.4).
5.1.3.2.2
Actions when a RLC data PDU is received from lower layer
When a RLC data PDU is received from lower layer, where the RLC data PDU contains byte segment numbers y to z of
an AMD PDU with SN = x, the receiving side of an AM RLC entity shall:
-
if x falls outside of the receiving window; or
-
if byte segment numbers y to z of the AMD PDU with SN = x have been received before:
-
-
discard the received RLC data PDU;
else:
-
place the received RLC data PDU in the reception buffer;
-
if some byte segments of the AMD PDU contained in the RLC data PDU have been received before:
-
discard the duplicate byte segments.
5.1.3.2.3
Actions when a RLC data PDU is placed in the reception buffer
When a RLC data PDU with SN = x is placed in the reception buffer, the receiving side of an AM RLC entity shall:
-
if x >= VR(H)
-
-
if all byte segments of the AMD PDU with SN = VR(MS) are received:
-
-
update VR(MS) to the SN of the first AMD PDU with SN > current VR(MS) for which not all byte segments
have been received;
if x = VR(R):
-
-
-
update VR(H) to x+ 1;
if all byte segments of the AMD PDU with SN = VR(R) are received:
-
update VR(R) to the SN of the first AMD PDU with SN > current VR(R) for which not all byte segments
have been received;
-
update VR(MR) to the updated VR(R) + AM_Window_Size;
reassemble RLC SDUs from any byte segments of AMD PDUs with SN that falls outside of the receiving
window and in-sequence byte segments of the AMD PDU with SN = VR(R), remove RLC headers when
doing so and deliver the reassembled RLC SDUs to upper layer in sequence if not delivered before;
if t-Reordering is running:
-
if VR(X) = VR(R); or
-
if VR(X) falls outside of the receiving window and VR(X) is not equal to VR(MR):
-
-
stop and reset t-Reordering;
if t-Reordering is not running (includes the case t-Reordering is stopped due to actions above):
-
if VR (H) > VR(R):
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start t-Reordering;
-
set VR(X) to VR(H).
5.1.3.2.4
3GPP TS 36.322 V10.0.0 (2010-12)
Actions when t-Reordering expires
When t-Reordering expires, the receiving side of an AM RLC entity shall:
-
update VR(MS) to the SN of the first AMD PDU with SN >= VR(X) for which not all byte segments have been
received;
-
if VR(H) > VR(MS):
-
start t-Reordering;
-
set VR(X) to VR(H).
5.2
ARQ procedures
ARQ procedures are only performed by an AM RLC entity.
5.2.1
Retransmission
The transmitting side of an AM RLC entity can receive a negative acknowledgement (notification of reception failure
by its peer AM RLC entity) for an AMD PDU or a portion of an AMD PDU by the following:
-
STATUS PDU from its peer AM RLC entity.
When receiving a negative acknowledgement for an AMD PDU or a portion of an AMD PDU by a STATUS PDU from
its peer AM RLC entity, the transmitting side of the AM RLC entity shall:
-
if the SN of the corresponding AMD PDU falls within the range VT(A) <= SN < VT(S):
-
consider the AMD PDU or the portion of the AMD PDU for which a negative acknowledgement was
received for retransmission.
When an AMD PDU or a portion of an AMD PDU is considered for retransmission, the transmitting side of the AM
RLC entity shall:
-
if the AMD PDU is considered for retransmission for the first time:
-
-
else, if it (the AMD PDU or the portion of the AMD PDU that is considered for retransmission) is not pending
for retransmission already, or a portion of it is not pending for retransmission already:
-
-
set the RETX_COUNT associated with the AMD PDU to zero;
increment the RETX_COUNT;
if RETX_COUNT = maxRetxThreshold:
-
indicate to upper layers that max retransmission has been reached.
When retransmitting an AMD PDU, the transmitting side of an AM RLC entity shall:
-
if the AMD PDU can entirely fit within the total size of RLC PDU(s) indicated by lower layer at the particular
transmission opportunity:
-
-
deliver the AMD PDU as it is except for the P field (the P field should be set according to sub clause 5.2.2) to
lower layer;
otherwise:
-
segment the AMD PDU, form a new AMD PDU segment which will fit within the total size of RLC PDU(s)
indicated by lower layer at the particular transmission opportunity and deliver the new AMD PDU segment
to lower layer.
When retransmitting a portion of an AMD PDU, the transmitting side of an AM RLC entity shall:
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segment the portion of the AMD PDU as necessary, form a new AMD PDU segment which will fit within the
total size of RLC PDU(s) indicated by lower layer at the particular transmission opportunity and deliver the new
AMD PDU segment to lower layer.
When forming a new AMD PDU segment, the transmitting side of an AM RLC entity shall:
-
only map the Data field of the original AMD PDU to the Data field of the new AMD PDU segment;
-
set the header of the new AMD PDU segment in accordance with the description in sub clause 6.;
-
set the P field according to sub clause 5.2.2.
5.2.2
Polling
An AM RLC entity can poll its peer AM RLC entity in order to trigger STATUS reporting at the peer AM RLC entity.
5.2.2.1
Transmission of a AMD PDU or AMD PDU segment
Upon assembly of a new AMD PDU, the transmitting side of an AM RLC entity shall:
-
increment PDU_WITHOUT_POLL by one;
-
increment BYTE_WITHOUT_POLL by every new byte of Data field element that it maps to the Data field of
the RLC data PDU;
-
if PDU_WITHOUT_POLL >= pollPDU; or
-
if BYTE_WITHOUT_POLL >= pollByte;
-
include a poll in the RLC data PDU as described below.
Upon assembly of an AMD PDU or AMD PDU segment, the transmitting side of an AM RLC entity shall:
-
if both the transmission buffer and the retransmission buffer becomes empty (excluding transmitted RLC data
PDU awaiting for acknowledgements) after the transmission of the RLC data PDU; or
-
if no new RLC data PDU can be transmitted after the transmission of the RLC data PDU (e.g. due to window
stalling);
-
include a poll in the RLC data PDU as described below.
To include a poll in a RLC data PDU, the transmitting side of an AM RLC entity shall:
-
set the P field of the RLC data PDU to "1";
-
set PDU_WITHOUT_POLL to 0;
-
set BYTE_WITHOUT_POLL to 0;
After delivering a RLC data PDU including a poll to lower layer and after incrementing of VT(S) if necessary, the
transmitting side of an AM RLC entity shall:
-
set POLL_SN to VT(S) – 1;
-
if t-PollRetransmit is not running:
-
-
start t-PollRetransmit;
else:
-
5.2.2.2
restart t-PollRetransmit;
Reception of a STATUS report
Upon reception of a STATUS report from the receiving RLC AM entity the transmitting side of an AM RLC entity
shall:
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if the STATUS report comprises a positive or negative acknowledgement for the RLC data PDU with sequence
number equal to POLL_SN:
-
if t-PollRetransmit is running:
-
stop and reset t-PollRetransmit.
5.2.2.3
Expiry of t-PollRetransmit
Upon expiry of t-PollRetransmit, the transmitting side of an AM RLC entity shall:
-
if both the transmission buffer and the retransmission buffer are empty (excluding transmitted RLC data PDU
awaiting for acknowledgements); or
-
if no new RLC data PDU can be transmitted (e.g. due to window stalling):
-
-
consider the AMD PDU with SN = VT(S) – 1 for retransmission; or
-
consider any AMD PDU which has not been positively acknowledged for retransmission;
include a poll in a RLC data PDU as described in section 5.2.2.1.
5.2.3
Status reporting
An AM RLC entity sends STATUS PDUs to its peer AM RLC entity in order to provide positive and/or negative
acknowledgements of RLC PDUs (or portions of them).
RRC configures whether or not the status prohibit function is to be used for an AM RLC entity.
Triggers to initiate STATUS reporting include:
-
Polling from its peer AM RLC entity:
-
When a RLC data PDU with SN = x and the P field set to “1” is received from lower layer, the receiving side
of an AM RLC entity shall:
-
if the PDU is to be discarded as specified in subclause 5.1.3.2.2; or
-
if x < VR(MS) or x >= VR(MR):
-
-
trigger a STATUS report;
else:
-
delay triggering the STATUS report until x < VR(MS) or x >= VR(MR).
NOTE 1: This ensures that the RLC Status report is transmitted after HARQ reordering.
-
Detection of reception failure of an RLC data PDU:
-
The receiving side of an AM RLC entity shall trigger a STATUS report when t-Reordering expires.
NOTE 2: The expiry of t-Reordering triggers both VR(MS) to be updated and a STATUS report to be triggered, but
the STATUS report shall be triggered after VR(MS) is updated.
When STATUS reporting has been triggered, the receiving side of an AM RLC entity shall:
-
if t-StatusProhibit is not running:
-
-
at the first transmission opportunity indicated by lower layer, construct a STATUS PDU and deliver it to
lower layer;
else:
-
at the first transmission opportunity indicated by lower layer after t-StatusProhibit expires, construct a single
STATUS PDU even if status reporting was triggered several times while t-StatusProhibit was running and
deliver it to lower layer;
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When a STATUS PDU has been delivered to lower layer, the receiving side of an AM RLC entity shall:
-
start t-StatusProhibit.
When constructing a STATUS PDU, the AM RLC entity shall:
-
for the AMD PDUs with SN such that VR(R) <= SN < VR(MS) that has not been completely received yet, in
increasing SN order of PDUs and increasing byte segment order within PDUs, starting with SN = VR(R) up to
the point where the resulting STATUS PDU still fits to the total size of RLC PDU(s) indicated by lower layer:
-
for an AMD PDU for which no byte segments have been received yet::
-
-
for a continuous sequence of byte segments of a partly received AMD PDU that have not been received yet:
-
-
include in the STATUS PDU a NACK_SN which is set to the SN of the AMD PDU;
include in the STATUS PDU a set of NACK_SN, SOstart and SOend
set the ACK_SN to the SN of the next not received RLC Data PDU which is not indicated as missing in the
resulting STATUS PDU.
5.3
SDU discard procedures
When indicated from upper layer (i.e. PDCP) to discard a particular RLC SDU, the transmitting side of an AM RLC
entity or the transmitting UM RLC entity shall discard the indicated RLC SDU if no segment of the RLC SDU has been
mapped to a RLC data PDU yet.
5.4
Re-establishment procedure
RLC re-establishment is performed upon request by RRC, and the function is applicable for AM, UM and TM RLC
entities.
When RRC indicates that an RLC entity should be re-established, the RLC entity shall:
-
if it is a transmitting TM RLC entity:
-
-
-
if it is a receiving UM RLC entity:
-
when possible, reassemble RLC SDUs from UMD PDUs with SN < VR(UH), remove RLC headers when
doing so and deliver all reassembled RLC SDUs to upper layer in ascending order of the RLC SN, if not
delivered before;
-
discard all remaining UMD PDUs;
if it is a transmitting UM RLC entity:
-
-
discard all RLC SDUs;
discard all RLC SDUs;
if it is an AM RLC entity:
-
when possible, reassemble RLC SDUs from any byte segments of AMD PDUs with SN < VR(MR) in the
receiving side, remove RLC headers when doing so and deliver all reassembled RLC SDUs to upper layer in
ascending order of the RLC SN, if not delivered before;
-
discard the remaining AMD PDUs and byte segments of AMD PDUs in the receiving side;
-
discard all RLC SDUs and AMD PDUs in the transmitting side;
-
discard all RLC control PDUs.
-
stop and reset all timers;
-
reset all state variables to their initial values.
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5.5
Handling of unknown, unforeseen and erroneous protocol
data
5.5.1
Reception of PDU with reserved or invalid values
When an RLC entity receives an RLC PDU that contains reserved or invalid values, the RLC entity shall:
-
discard the received PDU.
6
Protocol data units, formats and parameters
6.1
Protocol data units
RLC PDUs can be categorized into RLC data PDUs and RLC control PDUs. RLC data PDUs in sub clause 6.1.1 are
used by TM, UM and AM RLC entities to transfer upper layer PDUs (i.e. RLC SDUs). RLC control PDUs in sub clause
6.1.2 are used by AM RLC entity to perform ARQ procedures.
6.1.1
RLC data PDU
a) TMD PDU
TMD PDU is used to transfer upper layer PDUs by a TM RLC entity.
b) UMD PDU
UMD PDU is used to transfer upper layer PDUs by an UM RLC entity.
c) AMD PDU
AMD PDU is used to transfer upper layer PDUs by an AM RLC entity. It is used when the AM RLC entity transmits
(part of) the RLC SDU for the first time, or when the AM RLC entity retransmits an AMD PDU without having to
perform re-segmentation.
d) AMD PDU segment
AMD PDU segment is used to transfer upper layer PDUs by an AM RLC entity. It is used when the AM RLC entity
needs to retransmit a portion of an AMD PDU.
6.1.2
RLC control PDU
a) STATUS PDU
STATUS PDU is used by the receiving side of an AM RLC entity to inform the peer AM RLC entity about RLC data
PDUs that are received successfully, and RLC data PDUs that are detected to be lost by the receiving side of an AM
RLC entity.
6.2
Formats and parameters
The formats of RLC PDUs are described in sub clause 6.2.1 and their parameters are described in sub clause 6.2.2.
6.2.1
6.2.1.1
Formats
General
RLC PDU is a bit string. In the figures in sub clause 6.2.1.2 to 6.2.1.6, bit strings are represented by tables in which the
first and most significant bit is the left most bit of the first line of the table, the last and least significant bit is the
rightmost bit of the last line of the table, and more generally the bit string is to be read from left to right and then in the
reading order of the lines.
RLC SDUs are bit strings that are byte aligned (i.e. multiple of 8 bits) in length. An RLC SDU is included into an RLC
PDU from first bit onward.
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TMD PDU
TMD PDU consists only of a Data field and does not consist of any RLC headers.
Data
Oct 1
Oct N
Figure 6.2.1.2-1: TMD PDU
6.2.1.3
UMD PDU
UMD PDU consists of a Data field and an UMD PDU header.
UMD PDU header consists of a fixed part (fields that are present for every UMD PDU) and an extension part (fields
that are present for an UMD PDU when necessary). The fixed part of the UMD PDU header itself is byte aligned and
consists of a FI, an E and a SN. The extension part of the UMD PDU header itself is byte aligned and consists of E(s)
and LI(s).
An UM RLC entity is configured by RRC to use either a 5 bit SN or a 10 bit SN. When the 5 bit SN is configured, the
length of the fixed part of the UMD PDU header is one byte. When the 10 bit SN is configured, the fixed part of the
UMD PDU header is identical to the fixed part of the AMD PDU header, except for D/C, RF and P fields all being
replaced with R1 fields. The extension part of the UMD PDU header is identical to the extension part of the AMD PDU
header (regardless of the configured SN size).
An UMD PDU header consists of an extension part only when more than one Data field elements are present in the
UMD PDU, in which case an E and a LI are present for every Data field element except the last. Furthermore, when an
UMD PDU header consists of an odd number of LI(s), four padding bits follow after the last LI.
Figure 6.2.1.3-1: UMD PDU with 5 bit SN (No LI)
Figure 6.2.1.3-2: UMD PDU with 10 bit SN (No LI)
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FI
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SN
E
E
LI1
E
LI2 (if K>=3)
LIK-2
E
LIK-1
LI1
LI2
Present
if K >= 3
E
LIK-2
LIK-1
LIK
E
LIK
Padding
Data
Oct 1
Oct 2
Oct 3
Oct 4
Oct [2.5+1.5*K-5]
Oct [2.5+1.5*K-4]
Oct [2.5+1.5*K-3]
Oct [2.5+1.5*K-2]
Oct [2.5+1.5*K-1]
Oct [2.5+1.5*K]
Oct N
Figure 6.2.1.3-3: UMD PDU with 5 bit SN (Odd number of LIs, i.e. K = 1, 3, 5, …)
Figure 6.2.1.3-4: UMD PDU with 5 bit SN (Even number of LIs, i.e. K = 2, 4, 6, …)
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R1
R1
R1
FI
SN
E
3GPP TS 36.322 V10.0.0 (2010-12)
E
SN
LI1
E
LI2 (if K>=3)
LIK-2
E
LIK-1
LI1
LI2
Present
if K >= 3
E
LIK-2
LIK-1
LIK
E
LIK
Padding
Data
Oct 1
Oct 2
Oct 3
Oct 4
Oct 5
Oct [2.5+1.5*K-4]
Oct [2.5+1.5*K-3]
Oct [2.5+1.5*K-2]
Oct [2.5+1.5*K-1]
Oct [2.5+1.5*K]
Oct [2.5+1.5*K+1]
Oct N
Figure 6.2.1.3-5: UMD PDU with 10 bit SN (Odd number of LIs, i.e. K = 1, 3, 5, …)
Figure 6.2.1.3-6: UMD PDU with 10 bit SN (Even number of LIs, i.e. K = 2, 4, 6, …)
6.2.1.4
AMD PDU
AMD PDU consists of a Data field and an AMD PDU header.
AMD PDU header consists of a fixed part (fields that are present for every AMD PDU) and an extension part (fields
that are present for an AMD PDU when necessary). The fixed part of the AMD PDU header itself is byte aligned and
consists of a D/C, a RF, a P, a FI, an E and a SN. The extension part of the AMD PDU header itself is byte aligned and
consists of E(s) and LI(s).
An AMD PDU header consists of an extension part only when more than one Data field elements are present in the
AMD PDU, in which case an E and a LI are present for every Data field element except the last. Furthermore, when an
AMD PDU header consists of an odd number of LI(s), four padding bits follow after the last LI.
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D/C
RF
P
3GPP TS 36.322 V10.0.0 (2010-12)
FI
SN
Data
E
SN
Oct 1
Oct 2
Oct 3
Oct N
Figure 6.2.1.4-1: AMD PDU (No LI)
D/C
RF
P
FI
SN
E
E
LI1
E
LI1
SN
LI2 (if K>=3)
LI2
Present if
K >= 3
E
LIK-2
LIK-2
E
LIK-1
LIK-1
LIK
E
LIK
Padding
Data
Oct
Oct
Oct
Oct
Oct
1
2
3
4
5
Oct [2.5+1.5*K-4]
Oct [2.5+1.5*K-3]
Oct [2.5+1.5*K-2]
Oct [2.5+1.5*K-1]
Oct [2.5+1.5*K]
Oct [2.5+1.5*K+1]
Oct N
Figure 6.2.1.4-2: AMD PDU (Odd number of LIs, i.e. K = 1, 3, 5, …)
Figure 6.2.1.4-3: AMD PDU (Even number of LIs, i.e. K = 2, 4, 6, …)
6.2.1.5
AMD PDU segment
AMD PDU segment consists of a Data field and an AMD PDU segment header.
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AMD PDU segment header consists of a fixed part (fields that are present for every AMD PDU segment) and an
extension part (fields that are present for an AMD PDU segment when necessary). The fixed part of the AMD PDU
segment header itself is byte aligned and consists of a D/C, a RF, a P, a FI, an E, a SN, a LSF and a SO. The extension
part of the AMD PDU segment header itself is byte aligned and consists of E(s) and LI(s).
An AMD PDU segment header consists of an extension part only when more than one Data field elements are present
in the AMD PDU segment, in which case an E and a LI are present for every Data field element except the last.
Furthermore, when an AMD PDU segment header consists of an odd number of LI(s), four padding bits follow after the
last LI.
Figure 6.2.1.5-1: AMD PDU segment (No LI)
Figure 6.2.1.5-2: AMD PDU segment (Odd number of LIs, i.e. K = 1, 3, 5, …)
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D/C
RF
P
FI
SN
LSF
3GPP TS 36.322 V10.0.0 (2010-12)
E
SN
SO
SO
E
LI1
E
LI2
LIK-1
E
LIK
LI1
LI2
E
LIK-1
LIK
Data
Oct
Oct
Oct
Oct
Oct
Oct
Oct
1
2
3
4
5
6
7
Oct
Oct
Oct
Oct
[4+1.5*K-2]
[4+1.5*K-1]
[4+1.5*K]
[4+1.5*K+1]
Oct N
Figure 6.2.1.5-3: AMD PDU segment (Even number of LIs, i.e. K = 2, 4, 6, …)
6.2.1.6
STATUS PDU
STATUS PDU consists of a STATUS PDU payload and a RLC control PDU header.
RLC control PDU header consists of a D/C and a CPT field.
The STATUS PDU payload starts from the first bit following the RLC control PDU header, and it consists of one
ACK_SN and one E1, zero or more sets of a NACK_SN, an E1 and an E2, and possibly a set of a SOstart and a SOend
for each NACK_SN. When necessary one to seven padding bits are included in the end of the STATUS PDU to achieve
octet alignment.
Figure 6.2.1.6-1: STATUS PDU
6.2.2
Parameters
6.2.2.1
General
In the definition of each field in sub clauses 6.2.2.2 to 6.2.2.19, the bits in the parameters are represented in which the
first and most significant bit is the left most bit and the last and least significant bit is the rightmost bit. Unless
mentioned otherwise, integers are encoded in standard binary encoding for unsigned integers.
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Data field
Data field elements are mapped to the Data field in the order which they arrive to the RLC entity at the transmitter.
For TMD PDU, UMD PDU and AMD PDU:
-
The granularity of the Data field size is one byte;
-
The maximum Data field size is the maximum TB size minus the sum of minimum MAC PDU header size and
minimum RLC PDU header size.
For TMD PDU:
-
Only one RLC SDU can be mapped to the Data field of one TMD PDU.
For UMD PDU, AMD PDU and AMD PDU segment:
-
Either of the following can be mapped to the Data field of one UMD PDU, AMD PDU or AMD PDU segment:
-
Zero RLC SDU segments and one or more RLC SDUs;
-
One or two RLC SDU segments and zero or more RLC SDUs;
-
RLC SDU segments are either mapped to the beginning or the end of the Data field;
-
A RLC SDU or RLC SDU segment larger than 2047 octets can only be mapped to the end of the Data field;
-
When there are two RLC SDU segments, they belong to different RLC SDUs.
6.2.2.3
Sequence Number (SN) field
Length: 10 bits for AMD PDU and AMD PDU segments. 5 bits or 10 bits (configurable) for UMD PDU.
The SN field indicates the sequence number of the corresponding UMD or AMD PDU. For an AMD PDU segment, the
SN field indicates the sequence number of the original AMD PDU from which the AMD PDU segment was constructed
from. The sequence number is incremented by one for every UMD or AMD PDU.
6.2.2.4
Extension bit (E) field
Length: 1 bit.
The E field indicates whether Data field follows or a set of E field and LI field follows. The interpretation of the E field
is provided in Table 6.2.2.4-1 and Table 6.2.2.4-2.
Table 6.2.2.4-1: E field interpretation (for E field in the fixed part of the header)
Value
0
1
Description
Data field follows from the octet following the fixed part of the header
A set of E field and LI field follows from the octet following the fixed part of the header
Table 6.2.2.4-2: E field interpretation (for E field in the extension part of the header)
Value
0
1
6.2.2.5
Description
Data field follows from the octet following the LI field following this E field
A set of E field and LI field follows from the bit following the LI field following this E field
Length Indicator (LI) field
Length: 11 bits.
The LI field indicates the length in bytes of the corresponding Data field element present in the RLC data PDU
delivered/received by an UM or an AM RLC entity. The first LI present in the RLC data PDU header corresponds to the
first Data field element present in the Data field of the RLC data PDU, the second LI present in the RLC data PDU
header corresponds to the second Data field element present in the Data field of the RLC data PDU, and so on. The
value 0 is reserved.
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Framing Info (FI) field
Length: 2 bits.
The FI field indicates whether a RLC SDU is segmented at the beginning and/or at the end of the Data field.
Specifically, the FI field indicates whether the first byte of the Data field corresponds to the first byte of a RLC SDU,
and whether the last byte of the Data field corresponds to the last byte of a RLC SDU. The interpretation of the FI field
is provided in Table 6.2.2.6-1.
Table 6.2.2.6-1: FI field interpretation
Value
00
01
10
11
6.2.2.7
Description
First byte of the Data field corresponds to the first byte of a RLC SDU.
Last byte of the Data field corresponds to the last byte of a RLC SDU.
First byte of the Data field corresponds to the first byte of a RLC SDU.
Last byte of the Data field does not correspond to the last byte of a RLC SDU.
First byte of the Data field does not correspond to the first byte of a RLC SDU.
Last byte of the Data field corresponds to the last byte of a RLC SDU.
First byte of the Data field does not correspond to the first byte of a RLC SDU.
Last byte of the Data field does not correspond to the last byte of a RLC SDU.
Segment Offset (SO) field
Length: 15 bits.
The SO field indicates the position of the AMD PDU segment in bytes within the original AMD PDU. Specifically, the
SO field indicates the position within the Data field of the original AMD PDU to which the first byte of the Data field
of the AMD PDU segment corresponds to. The first byte in the Data field of the original AMD PDU is referred by the
SO field value "000000000000000", i.e., numbering starts at zero.
6.2.2.8
Last Segment Flag (LSF) field
Length: 1 bit.
The LSF field indicates whether or not the last byte of the AMD PDU segment corresponds to the last byte of an AMD
PDU. The interpretation of the LSF field is provided in Table 6.2.2.8-1.
Table 6.2.2.8-1: LSF field interpretation
Value
0
1
6.2.2.9
Description
Last byte of the AMD PDU segment does not correspond to the last byte of an AMD PDU.
Last byte of the AMD PDU segment corresponds to the last byte of an AMD PDU.
Data/Control (D/C) field
Length: 1 bit.
The D/C field indicates whether the RLC PDU is a RLC data PDU or RLC control PDU. The interpretation of the D/C
field is provided in Table 6.2.2.9-1.
Table 6.2.2.9-1: D/C field interpretation
Value
0
1
6.2.2.10
Description
Control PDU
Data PDU
Re-segmentation Flag (RF) field
Length: 1 bit.
The RF field indicates whether the RLC PDU is an AMD PDU or AMD PDU segment. The interpretation of the RF
field is provided in Table 6.2.2.10-1.
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Table 6.2.2.10-1: RF field interpretation
Value
0
1
6.2.2.11
Description
AMD PDU
AMD PDU segment
Polling bit (P) field
Length: 1 bit.
The P field indicates whether or not the transmitting side of an AM RLC entity requests a STATUS report from its peer
AM RLC entity. The interpretation of the P field is provided in Table 6.2.2.11-1.
Table 6.2.2.11-1: P field interpretation
Value
0
1
6.2.2.12
Description
Status report not requested
Status report is requested
Reserved 1 (R1) field
Length: 1 bit.
The R1 field is a reserved field for this release of the protocol. The transmitting entity shall set the R1 field to "0". The
receiving entity shall ignore this field.
6.2.2.13
Control PDU Type (CPT) field
Length: 3 bits.
The CPT field indicates the type of the RLC control PDU. The interpretation of the CPT field is provided in Table
6.2.2.13-1.
Table 6.2.2.13-1: CPT field interpretation
Value
000
001-111
6.2.2.14
Description
STATUS PDU
Reserved
(PDUs with this coding will be discarded by the receiving entity for this release of the protocol)
Acknowledgement SN (ACK_SN) field
Length: 10 bits.
The ACK_SN field indicates the SN of the next not received RLC Data PDU which is not reported as missing in the
STATUS PDU. When the transmitting side of an AM RLC entity receives a STATUS PDU, it interprets that all AMD
PDUs up to but not including the AMD PDU with SN = ACK_SN have been received by its peer AM RLC entity,
excluding those AMD PDUs indicated in the STATUS PDU with NACK_SN and portions of AMD PDUs indicated in
the STATUS PDU with NACK_SN, SOstart and SOend.
6.2.2.15
Extension bit 1 (E1) field
Length: 1 bit.
The E1 field indicates whether or not a set of NACK_SN, E1 and E2 follows. The interpretation of the E1 field is
provided in Table 6.2.2.15-1.
Table 6.2.2.15-1: E1 field interpretation
Value
0
1
Description
A set of NACK_SN, E1 and E2 does not follow.
A set of NACK_SN, E1 and E2 follows.
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Negative Acknowledgement SN (NACK_SN) field
Length: 10 bits.
The NACK_SN field indicates the SN of the AMD PDU (or portions of it) that has been detected as lost at the receiving
side of the AM RLC entity.
6.2.2.17
Extension bit 2 (E2) field
Length: 1 bit.
The E2 field indicates whether or not a set of SOstart and SOend follows. The interpretation of the E2 field is provided
in Table 6.2.2.17-1.
Table 6.2.2.17-1: E2 field interpretation
Value
0
1
6.2.2.18
Description
A set of SOstart and SOend does not follow for this NACK_SN.
A set of SOstart and SOend follows for this NACK_SN.
SO start (SOstart) field
Length: 15 bits.
The SOstart field (together with the SOend field) indicates the portion of the AMD PDU with SN = NACK_SN (the
NACK_SN for which the SOstart is related to) that has been detected as lost at the receiving side of the AM RLC entity.
Specifically, the SOstart field indicates the position of the first byte of the portion of the AMD PDU in bytes within the
Data field of the AMD PDU. The first byte in the Data field of the original AMD PDU is referred by the SOstart field
value "000000000000000", i.e., numbering starts at zero.
6.2.2.19
SO end (SOend) field
Length: 15 bits.
The SOend field (together with the SOstart field) indicates the portion of the AMD PDU with SN = NACK_SN (the
NACK_SN for which the SOend is related to) that has been detected as lost at the receiving side of the AM RLC entity.
Specifically, the SOend field indicates the position of the last byte of the portion of the AMD PDU in bytes within the
Data field of the AMD PDU. The first byte in the Data field of the original AMD PDU is referred by the SOend field
value "000000000000000", i.e., numbering starts at zero. The special SOend value "111111111111111" is used to
indicate that the missing portion of the AMD PDU includes all bytes to the last byte of the AMD PDU.
7
Variables, constants and timers
7.1
State variables
This sub clause describes the state variables used in AM and UM entities in order to specify the RLC protocol. The state
variables defined in this subclause are normative.
All state variables and all counters are non-negative integers.
All state variables related to AM data transfer can take values from 0 to 1023. All arithmetic operations contained in the
present document on state variables related to AM data transfer are affected by the AM modulus (i.e. final value =
[value from arithmetic operation] modulo 1024).
All state variables related to UM data transfer can take values from 0 to [2[sn-FieldLength] – 1]. All arithmetic operations
contained in the present document on state variables related to UM data transfer are affected by the UM modulus (i.e.
final value = [value from arithmetic operation] modulo 2[sn-FieldLength]).
AMD PDUs and UMD PDUs are numbered integer sequence numbers (SN) cycling through the field: 0 to 1023 for AMD
PDU and 0 to [2[sn-FieldLength] – 1] for UMD PDU.
When performing arithmetic comparisons of state variables or SN values, a modulus base shall be used.
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VT(A) and VR(R) shall be assumed as the modulus base at the transmitting side and receiving side of an AM RLC
entity, respectively. This modulus base is subtracted from all the values involved, and then an absolute comparison is
performed (e.g. VR(R) <= SN < VR(MR) is evaluated as [VR(R) – VR(R)] modulo 1024 <= [SN – VR(R)] modulo
1024 < [VR(MR) – VR(R)] modulo 1024).
VR(UH) – UM_Window_Size shall be assumed as the modulus base at the receiving side of an UM RLC entity. This
modulus base is subtracted from all the values involved, and then an absolute comparison is performed (e.g. (VR(UH) –
UM_Window_Size) <= SN < VR(UH) is evaluated as [(VR(UH) – UM_Window_Size) – (VR(UH) –
UM_Window_Size)] modulo 2[sn-FieldLength] <= [SN – (VR(UH) – UM_Window_Size)] modulo 2[sn-FieldLength] < [VR(UH) –
(VR(UH) – UM_Window_Size)] modulo 2[sn-FieldLength]).
The transmitting side of each AM RLC entity shall maintain the following state variables:
a) VT(A) – Acknowledgement state variable
This state variable holds the value of the SN of the next AMD PDU for which a positive acknowledgment is to be
received in-sequence, and it serves as the lower edge of the transmitting window. It is initially set to 0, and is updated
whenever the AM RLC entity receives a positive acknowledgment for an AMD PDU with SN = VT(A).
b) VT(MS) – Maximum send state variable
This state variable equals VT(A) + AM_Window_Size, and it serves as the higher edge of the transmitting window.
c) VT(S) – Send state variable
This state variable holds the value of the SN to be assigned for the next newly generated AMD PDU. It is initially set to
0, and is updated whenever the AM RLC entity delivers an AMD PDU with SN = VT(S).
d) POLL_SN – Poll send state variable
This state variable holds the value of VT(S)-1 upon the most recent transmission of a RLC data PDU with the poll bit
set to “1”. It is initially set to 0.
The transmitting side of each AM RLC entity shall maintain the following counters:
a) PDU_WITHOUT_POLL – Counter
This counter is initially set to 0. It counts the number of AMD PDUs sent since the most recent poll bit was transmitted.
b) BYTE_WITHOUT_POLL – Counter
This counter is initially set to 0. It counts the number of data bytes sent since the most recent poll bit was transmitted.
c) RETX_COUNT – Counter
This counter counts the number of retransmissions of an AMD PDU (see subclause 5.2.1). There is one RETX_COUNT
counter per PDU that needs to be retransmitted.
The receiving side of each AM RLC entity shall maintain the following state variables:
a) VR(R) – Receive state variable
This state variable holds the value of the SN following the last in-sequence completely received AMD PDU, and it
serves as the lower edge of the receiving window. It is initially set to 0, and is updated whenever the AM RLC entity
receives an AMD PDU with SN = VR(R).
b) VR(MR) – Maximum acceptable receive state variable
This state variable equals VR(R) + AM_Window_Size, and it holds the value of the SN of the first AMD PDU that is
beyond the receiving window and serves as the higher edge of the receiving window.
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c) VR(X) – t-Reordering state variable
This state variable holds the value of the SN following the SN of the RLC data PDU which triggered t-Reordering..
d) VR(MS) – Maximum STATUS transmit state variable
This state variable holds the highest possible value of the SN which can be indicated by “ACK_SN” when a STATUS
PDU needs to be constructed. It is initially set to 0.
e) VR(H) – Highest received state variable
This state variable holds the value of the SN following the SN of the RLC data PDU with the highest SN among
received RLC data PDUs. It is initially set to 0.
Each transmitting UM RLC entity shall maintain the following state variables:
a) VT(US)
This state variable holds the value of the SN to be assigned for the next newly generated UMD PDU. It is initially set to
0, and is updated whenever the UM RLC entity delivers an UMD PDU with SN = VT(US).
Each receiving UM RLC entity shall maintain the following state variables:
a) VR(UR) – UM receive state variable
This state variable holds the value of the SN of the earliest UMD PDU that is still considered for reordering. It is
initially set to 0.
b) VR(UX) – UM t-Reordering state variable
This state variable holds the value of the SN following the SN of the UMD PDU which triggered t-Reordering.
c) VR(UH) – UM highest received state variable
This state variable holds the value of the SN following the SN of the UMD PDU with the highest SN among received
UMD PDUs, and it serves as the higher edge of the reordering window. It is initially set to 0.
7.2
Constants
a) AM_Window_Size
This constant is used by both the transmitting side and the receiving side of each AM RLC entity to calculate VT(MS)
from VT(A), and VR(MR) from VR(R). AM_Window_Size = 512.
b) UM_Window_Size
This constant is used by the receiving UM RLC entity to define SNs of those UMD PDUs that can be received without
causing an advancement of the receiving window. UM_Window_Size = 16 when a 5 bit SN is configured,
UM_Window_Size = 512 when a 10 bit SN is configured and UM_Window_Size = 0 when the receiving UM RLC
entity is configured for MCCH or MTCH.
7.3
Timers
The following timers are configured by RRC [5]:
a) t-PollRetransmit
This timer is used by the transmitting side of an AM RLC entity in order to retransmit a poll (see sub clause 5.2.2).
b) t-Reordering
This timer is used by the receiving side of an AM RLC entity and receiving UM RLC entity in order to detect loss of
RLC PDUs at lower layer (see sub clauses 5.1.2.2 and 5.1.3.2). If t-Reordering is running, t-Reordering shall not be
started additionally, i.e. only one t-Reordering per RLC entity is running at a given time.
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c) t-StatusProhibit
This timer is used by the receiving side of an AM RLC entity in order to prohibit transmission of a STATUS PDU (see
sub clause 5.2.3).
7.4
Configurable parameters
The following parameters are configured by RRC [5]:
a) maxRetxThreshold
This parameter is used by the transmitting side of each AM RLC entity to limit the number of retransmissions of an
AMD PDU (see subclause 5.2.1).
b) pollPDU
This parameter is used by the transmitting side of each AM RLC entity to trigger a poll for every pollPDU PDUs (see
subclause 5.2.2).
c) pollByte
This parameter is used by the transmitting side of each AM RLC entity to trigger a poll for every pollByte bytes (see
subclause 5.2.2).
d) sn-FieldLength
This parameter gives the UM SN field size in bits (see subclause 7.1).
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Annex A (informative):
Change history
Change history
Date
2007-06
2007-06
TSG #
TSG Doc. CR
RAN2#58 R2-072715
bis
RAN2#58 R2-072910
bis
2007-06
RAN2#58 R2-072995
bis
2007-06
RAN2#58 R2-072996
bis
2007-08
RAN2#59 R2-073554
2007-08
2007-08
RAN2#59 R2-073712
RAN2#59 R2-073844
2007-08
RAN2#59 R2-073868
2007-08
2007-09
RAN2#59 R2-073881
RAN#37 RP-070689
2007-11
RAN2#60 R2-074583
Rev Subject/Comment
First version;
Endorsed as v0.1.0.
Added definition for Data field element and RLC SDU segment;
Removed Editor's note on non-byte-aligned RLC SDUs;
Added description for Data field for AMD PDU;
Added Align Info for AMD PDU header element;
Added description on extension part of AMD PDU header at
concatenation;
Added figure for AMD PDU;
Added Segment Offset and Length Field for AMD PDU segment
header element;
Added Editor's note for STATUS PDU;
Added general text on parameters;
Added description for Extension bit, Length Indicator, Align Info,
Segment Offset and Last Segment Flag;
Removed Editor's note on Length Indicator.
Moved description of Data field for AMD PDU and TMD PDU to the
section dedicated to Data field;
Changed terminology for Align Info to Segmentation Info;
Added Segmentation Info for UMD PDU header element;
Removed figure for AMD PDU;
Corrected error for AMD PDU segment header element (replaced
Length Field by Last Segment Flag);
Added place holders to specify the number of bits for the individual
RLC header elements;
Modified description for Extension bit, Segmentation Info and Last
Segment Flag using tables.
Bracketed terminology for Segmentation Info;
Corrected section numbering;
Clarified description of Extension bit and Segment Offset.
Added receive operation descriptions for the case AM RLC entity
receives AMD PDU segments;
Modified general texts regarding retransmissions;
Added a general description text for Segmentation Info;
Added an Editor's note for Segment Offset.
v0.1.4 was endorsed by RAN WG2 as v0.2.0.
Added some missing abbreviations in section 3.2;
Added description and a figure regarding RLC entity configuration in
section 4.2.1, and removed Editor's note on this aspect;
Added new sub clauses under sections 4.2.1.1-4.2.1.3 (purely
editorial modification)
Added description on SN, i.e. RLC PDU based SN, and removed
Editor's note on the possibility of having the same header structure
for AMD PDU and AMD PDU segment due to PDCP SN reuse;
Added description of the AM receive window operation;
Added description that fixed header part should be byte aligned and
extension header part should be byte aligned;
Modified description on extension header part (LI and E are not
required for the last Data field element) and removed Editor's note
on this aspect;
Added further description on Data field;
LI field size is set to 11bits;
Corrected editorial errors (reference number to tables)
Added 3 state variables: VT(S), VR(R), VR(MR).
Corrected editorial errors;
Added 1 constant: Rx_Wndow_Size;
Added description of modulus operation on VT(S), VR(R), VT(MR).
Removed reference to RLC UM for VT(R) and VT(MR).
v0.2.3 was endorsed by RAN WG2 as v1.0.0 and presented to RAN
plenary for information.
Added description of the AM transmit window operation;
Added Editor's note that PDU loss detection should be after HARQ
reordering;
Added description on AM retransmission and resegmentation;
Added description of the polling trigger "transmission of last data in
3GPP
Old
x.y.z
New
0.1.0
0.1.0
0.1.1
0.1.1
0.1.2
0.1.2
0.1.3
0.1.3
0.1.4
0.1.4
0.2.0
0.2.0
0.2.1
0.2.1
0.2.2
0.2.2
0.2.3
0.2.3
1.0.0
1.0.0
1.0.1
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Change history
Date
TSG #
TSG Doc.
2007-11
RAN2#60 R2-075061
2007-11
RAN2#60 R2-075154
2007-11
RAN2#60 R2-075198
2007-11
RAN2#60 R2-075430
2007-11
RAN2#60 R2-075500
CR
Rev Subject/Comment
the buffer";
Added polling trigger "poll retransmit timer" and its description;
Added Editor's note that either PDU count based or window based
polling trigger should be supported;
Added description of the status reporting trigger "polling from its
peer AM RLC entity";
Removed old Editor's note in the polling sub clause;
Added status reporting trigger "detection of reception failure of an
RLC data PDU" and its description;
Added status prohibit function and its description;
Added Editor's note that at least a 1byte fixed header for the UMD
PDU should be supported;
Complete AMD PDU and AMD PDU segment headers captured and
3 new figures inserted for each of them;
Added Editor's note that STATUS PDU will only have 1 format;
Modified description of the Data field so that it also applies to AMD
PDU segment;
Added description of the SN field in relation to the AMD PDU
segment;
Corrected description of the E field;
Defined SO field length to be 15bits;
Completed the description of the SO field and removed the related
Editor's note;
Added description of the D/C field, RF field and P field;
Added 2 state variables: VT(A) and VT(MS);
Added to the description of VT(S) and VR(MR);
Added 1 constant: Tx_Window_Size;
Added 2 timers: T_poll_prohibit and T_status_prohibit.r
Cleaned up terminology related to PDUs;
Editorial corrections (aligned wording, corrected Figure numbering,
clarifications, etc.)
Added Editor's note that exception cases when a negatively
acknowledged RLC data PDU should not be transmitted will be
captured when identified;
Added description that the use of status prohibit function and
particular polling triggers are configurable;
Modified receiver operation for RLC-AM regarding AMD PDU
segments (aligned with AMD PDU);
Added description that DL CCCH is handled by RLC-UM and
removed corresponding Editor's note;
Added Editor's note that wording "considered" regarding
retransmission of AMD PDU / AMD PDU segment in sub clause
5.2.1 should be improved;
Added to the description of SN field that it is 10bits for AMD PDU
and AMD PDU segment;
Removed Editor's note regarding the need for status prohibit
function;
Added Editor's note that the need for [SI] field for UMD PDU can be
challenged.
Added an Editor's note regarding Local NACK;
Modified wording in sub clause 5.2.1 on the object of retransmission
(RLC data PDU changed to AMD PDU / portion of AMD PDU);
Clarified that STATUS PDU is triggered after the PDU containing th
poll bit is "HARQ reordered", rather than just "reordered";
Removed incorrect inclusion of a T_status_prohibit and added an
Editor's which just says status prohibit function is supported.
Description regarding the modulus operation involving state
variables was changed in order to align with TS 25.322;
Figures on PDUs were slightly modified (editorial).
Text on receiver operation in sub clause 5.1.3 was revised to align
the description regarding modulus operation with TS 25.322;
Further cleaned up terminology related to PDUs;
V1.0.4 was endorsed by RAN WG2 as v1.1.0 with the above
revisions.
Added RLC architecture model figures (Figures 4.2.1.1.1-1,
4.2.1.2.1-1, 4.2.1.3.1-1);
Added Editor's note that the SDU discard functionality may not be
specified in RLC;
Added description of receive operations for RLC-UM in sub clause
5.1.2;
Added to the description of receive operations for RLC-AM in sub
clause 5.1.3 including: STATUS transmitting window definition,
procedures for the case RLC data PDU within receiving window is
received, actions at T_reordering expiry and RLC SDU reassembly;
3GPP
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New
1.0.1
1.0.2
1.0.2
1.0.3
1.0.3
1.0.4
1.0.4
1.1.0
1.1.0
1.1.1
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Change history
Date
TSG #
TSG Doc.
2007-11
RAN2#60 R2-075501
2007-11
RAN2#60 R2-075502
2007-11
RAN2#60 R2-075503
2007-11
RAN2#60 R2-075504
2007-11
RAN2#60 R2-074589
CR
Rev Subject/Comment
T_and in sub clause 5.1.3;
Removed Editor's note which said that PDU loss detection should
be after HARQ reordering;
Clarified the description of the polling trigger "transmission of last
data in the buffer";
Added description of STATUS PDU construction in sub clause 5.2.3
and removed an Editor's note in this sub clause;
Modified trigger for RLC SDU discard to "indication from PDCP";
Removed Editor's note on the type of PDUs to be specified;
Removed Editor's notes regarding STATUS PDU piggybacking;
Complete UMD PDU headers captured and 2 new figures inserted
for them, and removed Editor's note on UMD PDU;
Defined one STATUS PDU format with a new figure and an Editor's
note, and removed old Editor's note in sub clause 6.2.1.6;
Added description of the R1 field, CPT field, ACK_SN field, E1 field,
NACK_SN field, E2 field, SOstart field and SOend field.
Added 7 state variables: VR(R-SO), VR(X), VR(X-SO), VR(MS),
VR(UR), VR(UMR) and VR(UX);
Constants Rx_Window_Size and Tx Window size were converged
into one constant "Window_Size" of which the value is defined to
half the SN space, and constants "AM_Window_Size" and
"UM_Window_Size" were newly defined;
Added 1 timer: T_reordering.
Added definition for "byte segment";
Removed Editor's note which said that the SDU discard functionality
may not be specified in RLC;
Added missing description for RLC-UM receive operation (the case
when UMD PDU with SN that falls within the reordering window but
not equal to VR(R) is received);
Added missing description for RLC-AM receive operation (the case
when only part of the received RLC data PDU is received in
duplication);
Added text related to updating state variable VR(MS);
Added Editor's note that it has to be decided whether T_reordering
can be triggered by a missing RLC data PDU for which status
reporting has already been triggered once;
Editorial clarification / corrections were made.
Added text related to updating state variable VR(MS);
Editorial clarification / corrections were made.
Modified description of VR(MS) update procedure;
Modified description of VR(X) / VR(X-SO) update procedure;
Editorial corrections were made.
Added missing description with regards to RLC-AM receive
operation;
Added Editor's note on the delivery of RLC control PDUs;
Editorial corrections were made.
v1.1.5 was endorsed by RAN WG2 as v1.2.0.
3GPP
Old
New
1.1.1
1.1.2
1.1.2
1.1.3
1.1.3
1.1.4
1.1.4
1.1.5
1.1.5
1.2.0
Release 10
38
3GPP TS 36.322 V10.0.0 (2010-12)
Change history
Date
2007-11
TSG #
RP-38
TSG Doc. CR
RP-070918
2007-12
2008-03
RP-38
RP-39
RP-080196 0001
2008-05
RP-40
RP-40
RP-080411 0002
RP-080411 0003
RP-40
RP-40
RP-40
RP-40
RP-40
RP-40
RP-40
RP-080411
RP-080411
RP-080411
RP-080411
RP-080411
RP-080411
RP-080411
0004
0005
0006
0007
0008
0012
0015
Rev Subject/Comment
v1.2.0 was stepped to v2.0.0 and presented to RAN plenary for
approval.
Approved at TSG RAN-38 and placed under change control
CR0001 for TS 36.322 E-UTRA RLC:
Added reference to TS 36.321;
Clarified definition of “byte segment”;
Renamed “Segmentation Info” to “Framing Info”;
Aligned texts to refer to “upper layer” and “lower layer” instead of
RRC/PDCP and MAC;
Specified that BCCH and DL CCCH is handled by RLC-TM;
Added support for duplicate detection by receiving RLC UM entity;;
Clarified that RLC SDUs should be delivered to upper layers in
sequence;
Modified description so that MAC indicates “total size of RLC PDUs”
together with notification of transmission opportunity instead of “TB
size”;
Specified that RLC SDU discard is applied for RLC-AM and RLC
UM, and introduced the detailed RLC SDU discard procedure;
Renamed “RLC reset” to “RLC re-establishment”, and introduced
the detailed RLC re-establishment procedure;
Removed Editor’s note on RLC flow control (flow control will not be
supported by RLC);
Restructured the texts on RLC AM and RLC UM receive operations,
and added/modified the detailed descriptions;
Added description on prioritization of data to transmit (control >
data; retransmission > new data);
Removed the term STATUS transmitting window;
Clarified that retransmission of negatively acknowledged data by
STATUS PDU is mandatory and that retransmission of negatively
acknowledged data by HARQ delivery failure is optional;
Removed Editor’s note on retransmission prohibit (there will be no
conditions where negatively acknowledged data shall not be
retransmitted);
Clarified description on polling trigger “Transmission of last data in
buffer”;
Added new polling triggers “Every Poll_PDU PDUs” and “Every
Poll_Byte Bytes”, introduced their descriptions, and added an
Editor’s note that their configurability is FFS;
Added description on status reporting trigger “detection of reception
failure of an RLC data PDU”;
Introduced description of the status prohibit function;
Removed Editor’s note on the possibility to define more RLC control
PDUs (no more RLC control PDUs will be defined);
Clarified the “most significant bit” and “least significant bit” in an
RLC PDU;
Removed reference to bit numbers in RLC PDU;
Modified the order of fields in the 1byte UMD PDU header;
Removed Editor’s note on the order of fields in the AMD PDU / AMD
PDU segment header (they are now confirmed);
Modified definition of ACK_SN;
Defined the special value of SOend;
Added description on the UM modulus operation;
Removed state variables VR(R-SO), VR(X-SO) and VR(UMR);
Modified description/definition of state variables VR(MR), VR(X),
VR(MS), VR(UR) and VR(UX);
Introduced new state variables VR(H) and VR(UH) and their
descriptions;
Introduced new constants Poll_PDU and Poll_Byte and their
descriptions;
Clarified that only one T_reordering will be running at one time for
an RLC entity;
Introduced new timer T_status_prohibit and its description;
Editorial corrections were made.
1
Clarification on STATUS PDU size for BSR
Removal of Editor’s Note on updating of VR(MS) upon expiry of
T_reordering
Removal of STATUS receiving window
Duplicate detection in UM RLC
Correction to Polling Procedure
Miscellaneous corrections to TS 36.322
Small corrections to RLC
CR to 36.322 on correction to RLC PDU reassembly
1
36.322 CR on 'RLC retransmission count and addition of
Configurable Parameters'
3GPP
Old
1.2.0
New
2.0.0
2.0.0
8.0.0
8.0.0
8.1.0
8.1.0
8.1.0
8.2.0
8.2.0
8.1.0
8.1.0
8.1.0
8.1.0
8.1.0
8.1.0
8.1.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
Release 10
39
3GPP TS 36.322 V10.0.0 (2010-12)
Change history
Date
2008-09
2008-12
2009-03
2009-06
2009-09
2009-12
2010-03
2010-06
2010-09
2010-12
TSG #
RP-40
RP-40
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-41
RP-42
TSG Doc.
RP-080411
RP-080411
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-080691
RP-081019
CR
0017
0018
0019
0020
0021
0022
0024
0025
0029
0032
0033
0036
0039
0040
0043
Rev
1
2
1
-
RP-42
RP-42
RP-42
RP-42
RP-42
RP-42
RP-42
RP-42
RP-42
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-43
RP-44
RP-44
RP-44
RP-44
RP-45
RP-46
RP-47
RP-48
RP-49
RP-50
RP-081019
RP-081019
RP-081019
RP-081019
RP-081019
RP-081019
RP-081019
RP-081019
RP-081019
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090129
RP-090514
RP-090514
RP-090514
RP-090514
RP-090906
RP-091341
RP-100305
RP-100536
RP-100851
-
0046
0047
0048
0049
0050
0054
0055
0056
0057
0058
0059
0060
0061
0062
0063
0064
0065
0066
0067
0068
0069
0076
0080
0081
0082
0083
0084
0087
0089
0091
0092
-
1
1
1
1
1
1
-
Subject/Comment
Service alignments with TS 36.323 (PDCP)
CR on the procedure to construct the STATUS PDU
Clarification of polling
Corrections to formatting
The value of ACK_SN for partial STATUS PDU
Error cases for RLC
RLC entity re-establishment
Miscellaneous corrections to RLC specification
Clarification of the reordering timer
Clarification of Triggering Conditions for Status Reports
RLC UMD PDU formats with LI
Correction on UM Receive Operation
Correction for TM RLC entity: 6.1.2.3
Removal of MBMS channels: 6.1.2.3
Proposed CR for aligning the construction of partial Status PDUs
with intended operation
Error Handling in RLC
Miscellaneous corrections to 36.322
Correction to Segment Offset fields
Correction to the description of the delivery of RLC SDU
Minor issues on RLC
The setting of VR(X)
Adding RLC TM operation
Removing a redundant text on VT(A) setting
Counting RLC Retransmissions
CR to 36.322 on RRC Parameters
Local NACKing in UE
Supporting RLC SDU larger than 2047 octets
CR on the in sequence delivery function for UM
Correction to Delivery of PDU
Issues with SO, SOstart, and SOend fields
Miscellaneous corrections to RLC specification
Correction to status reporting triggering condition
Alignment of one condition on setting the poll bit
Proposed CR to 36.322 on Clarification on Polling procedure
Every Poll_PDU PDUs and Every Poll_Byte bytes triggers
UE behaviour when T_poll_retransmit expires
Definition of RETX_COUNT missing
Reset of T_poll_retransmission
RLC functions
Correction to handling of reserved field
Correction to condition for stopping t-Reordering in AM mode
Possible misinterpretation on incrementing RETX_COUNT
Capturing MBMS agreements in RLC
Correction to RLC entity
Correction of RLC VR(H) update
Miscellaneous corrections to RLC
Upgrade to Release 10 - no technical change
3GPP
Old
8.1.0
8.1.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.2.0
8.3.0
New
8.2.0
8.2.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.4.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.3.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.5.0
8.5.0
8.5.0
8.5.0
8.6.0
8.7.0
9.0.0
9.1.0
9.2.0
9.3.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.4.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.5.0
8.6.0
8.6.0
8.6.0
8.6.0
8.7.0
9.0.0
9.1.0
9.2.0
9.3.0
10.0.0
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