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TECHNICAL SPECIFICATION
LTE;
Evolved Universal Terrestrial Radio Access (E-UTRA);
Radio Link Control (RLC) protocol specification
(3GPP TS 36.322 version 12.1.0 Release 12)
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3GPP TS 36.322 version 12.1.0 Release 12 1 ETSI TS 136 322 V12.1.0 (2014-09)
Reference
RTS/TSGR-0236322vc10
Keywords
LTE
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3GPP TS 36.322 version 12.1.0 Release 12 2 ETSI TS 136 322 V12.1.0 (2014-09)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://ipr.etsi.org).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server)
which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "may not", "need", "need not", "will",
"will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms
for the expression of provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 36.322 version 12.1.0 Release 12 3 ETSI TS 136 322 V12.1.0 (2014-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 7
4 General . 7
4.1 Introduction . 7
4.2 RLC architecture . 7
4.2.1 RLC entities . 7
4.2.1.1 TM RLC entity . 9
4.2.1.1.1 General . 9
4.2.1.1.2 Transmitting TM RLC entity . 9
4.2.1.1.3 Receiving TM RLC entity . 9
4.2.1.2 UM RLC entity . 9
4.2.1.2.1 General . 9
4.2.1.2.2 Transmitting UM RLC entity . 10
4.2.1.2.3 Receiving UM RLC entity . 10
4.2.1.3 AM RLC entity . 11
4.2.1.3.1 General . 11
4.2.1.3.2 Transmitting side . 11
4.2.1.3.3 Receiving side . 12
4.3 Services . 12
4.3.1 Services provided to upper layers . 12
4.3.2 Services expected from lower layers . 12
4.4 Functions . 12
4.5 Data available for transmission . 13
5 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 . 14
5.1.2.1 Transmit operations . 14
5.1.2.1.1 General . 14
5.1.2.2 Receive operations . 14
5.1.2.2.1 General . 14
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 . 16
5.1.3.2.1 General . 16
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
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3GPP TS 36.322 version 12.1.0 Release 12 4 ETSI TS 136 322 V12.1.0 (2014-09)
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 . 19
5.2.2.3 Expiry of t-PollRetransmit . 19
5.2.3 Status reporting . 19
5.3 SDU discard procedures . 20
5.4 Re-establishment procedure . 21
5.5 Handling of unknown, unforeseen and erroneous protocol data . 21
5.5.1 Reception of PDU with reserved or invalid values . 21
6 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 . 22
6.2 Formats and parameters . 22
6.2.1 Formats . 22
6.2.1.1 General . 22
6.2.1.2 TMD PDU . 22
6.2.1.3 UMD PDU . 22
6.2.1.4 AMD PDU . 25
6.2.1.5 AMD PDU segment . 27
6.2.1.6 STATUS PDU . 28
6.2.2 Parameters. 29
6.2.2.1 General . 29
6.2.2.2 Data field . 29
6.2.2.3 Sequence Number (SN) field . 29
6.2.2.4 Extension bit (E) field . 30
6.2.2.5 Length Indicator (LI) field . 30
6.2.2.6 Framing Info (FI) field . 30
6.2.2.7 Segment Offset (SO) field . 30
6.2.2.8 Last Segment Flag (LSF) field . 31
6.2.2.9 Data/Control (D/C) field . 31
6.2.2.10 Re-segmentation Flag (RF) field . 31
6.2.2.11 Polling bit (P) field . 31
6.2.2.12 Reserved 1 (R1) field . 31
6.2.2.13 Control PDU Type (CPT) field . 32
6.2.2.14 Acknowledgement SN (ACK_SN) field . 32
6.2.2.15 Extension bit 1 (E1) field . 32
6.2.2.16 Negative Acknowledgement SN (NACK_SN) field . 32
6.2.2.17 Extension bit 2 (E2) field . 32
6.2.2.18 SO start (SOstart) field . 33
6.2.2.19 SO end (SOend) field . 33
7 Variables, constants and timers . 33
7.1 State variables . 33
7.2 Constants . 35
7.3 Timers . 35
7.4 Configurable parameters . 35
Annex A (informative): Change history . 37
History . 42
ETSI
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3GPP TS 36.322 version 12.1.0 Release 12 5 ETSI TS 136 322 V12.1.0 (2014-09)
Foreword
rd
This Technical Specification has been produced by the 3 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.
ETSI
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3GPP TS 36.322 version 12.1.0 Release 12 6 ETSI TS 136 322 V12.1.0 (2014-09)
1 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.
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3GPP TS 36.322 version 12.1.0 Release 12 7 ETSI TS 136 322 V12.1.0 (2014-09)
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AM Acknowledged Mode
AMD AM Data
ARQ Automatic Repeat reQuest
BCCH Broadcast Control CHannel
BCH Broadcast CHannel
CCCH Common Control CHannel
DCCH Dedicated Control CHannel
DL DownLink
DL-SCH DL-Shared CHannel
DTCH Dedicated Traffic CHannel
E Extension bit
eNB E-UTRAN Node B
E-UTRA Evolved UMTS Terrestrial Radio Access
E-UTRAN Evolved UMTS Terrestrial Radio Access Network
FI Framing Info
HARQ Hybrid ARQ
LI Length Indicator
LSF Last Segment Flag
MAC Medium Access Control
MCCH Multicast Control Channel
MTCH Multicast Traffic Channel
PCCH Paging Control CHannel
PDU Protocol Data Unit
RLC Radio Link Control
RRC Radio Resource Control
SAP Service Access Point
SDU Service Data Unit
SN Sequence Number
SO Segment Offset
TB Transport Block
TM Transparent Mode
TMD TM Data
UE User Equipment
UL UpLink
UM Unacknowledged Mode
UMD 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.
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3GPP TS 36.322 version 12.1.0 Release 12 8 ETSI TS 136 322 V12.1.0 (2014-09)
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
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.
upper layer
SAP between
upper layers
transmitting receiving transmitting receiving
AM RLC entity
eNB
TM RLC entity TM RLC entity UM RLC entity UM RLC entity
logical
channel
lower layers
radio interface
lower layers
logical
channel
receiving transmitting receiving transmitting
AM RLC entity
UE
TM RLC entity TM RLC entity UM RLC entity UM RLC entity
SAP between
upper layers
upper 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;
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3GPP TS 36.322 version 12.1.0 Release 12 9 ETSI TS 136 322 V12.1.0 (2014-09)
- 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.
4.2.1.1 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.
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 UM RLC entity
4.2.1
...