ETSI TS V8.2.0 ( ) Technical Specification

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1 TS V8.2.0 ( ) Technical Specification LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Link Control (RLC) protocol specification (3GPP TS version Release 8)

2 1 TS V8.2.0 ( ) Reference RTS/TSGR v820 Keywords LTE 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on printers of the PDF version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: 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. European Telecommunications Standards Institute All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM, TIPHON TM, the TIPHON logo and the logo are Trade Marks of registered for the benefit of its Members. 3GPP TM is a Trade Mark of registered for the benefit of its Members and of the 3GPP Organizational Partners.

3 2 TS V8.2.0 ( ) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not referenced in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by 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 deliverables. The cross reference between GSM, UMTS, 3GPP and identities can be found under

4 3 TS V8.2.0 ( ) Contents Intellectual Property Rights...2 Foreword...2 Foreword Scope References Definitions, symbols and abbreviations Definitions Abbreviations General Introduction RLC architecture RLC entities TM RLC entity General Transmitting TM RLC entity Receiving TM RLC entity UM RLC entity General Transmitting UM RLC entity Receiving UM RLC entity AM RLC entity General Transmitting side Receiving side Services Services provided to upper layers Services expected from lower layers Functions Data available for transmission Procedures Data transfer procedures TM data transfer UM data transfer Transmit operations General Receive operations General Actions when an UMD PDU is received from lower layer Actions when an UMD PDU is placed in the reception buffer Actions when T_reordering expires AM data transfer Transmit operations General Receive operations General Actions when a RLC data PDU is received from lower layer Actions when a RLC data PDU is placed in the reception buffer Actions when T_reordering expires ARQ procedures Retransmission Polling Status reporting SDU discard procedures...20

5 4 TS V8.2.0 ( ) 5.4 Re-establishment procedure Handling of unknown, unforeseen and erroneous protocol data Protocol data units, formats and parameters Protocol data units RLC data PDU RLC control PDU Formats and parameters Formats General TMD PDU UMD PDU AMD PDU AMD PDU segment STATUS PDU Parameters General Data field Sequence Number (SN) field Extension bit (E) field Length Indicator (LI) field Framing Info (FI) field Segment Offset (SO) field Last Segment Flag (LSF) field Data/Control (D/C) field Re-segmentation Flag (RF) field Polling bit (P) field Reserved 1 (R1) field Control PDU Type (CPT) field Acknowledgement SN (ACK_SN) field Extension bit 1 (E1) field Negative Acknowledgement SN (NACK_SN) field Extension bit 2 (E2) field SO start (SOstart) field SO end (SOend) field Variables, constants and timers State variables Constants Timers Configurable parameters...33 Annex A (informative): Change history...34 History...38

6 5 TS V8.2.0 ( ) Foreword This Technical Specification has been produced by the 3 rd 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.

7 6 TS V8.2.0 ( ) 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 : "Vocabulary for 3GPP Specifications". [2] 3GPP TS : "E-UTRA and E-UTRAN Overall Description; Stage 2". [3] 3GPP TS : "E-UTRA MAC protocol specification". [4] 3GPP TS : "E-UTRA PDCP specification". [5] 3GPP TS : "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 [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 [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.

8 7 TS V8.2.0 ( ) 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: 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 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 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.

9 8 TS V8.2.0 ( ) An RLC entity receives/delivers RLC SDUs from/to upper layer (i.e. RRC for CCCH, PDCP otherwise) and sends/receives RLC PDUs to/from its peer RLC entity via lower layers (i.e. MAC and physical layer). An RLC PDU can either be a RLC data PDU (see sub clause 6.1.1) or a RLC control PDU (see sub clause 6.2.1). 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. Figure : 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;

10 9 TS V8.2.0 ( ) - RLC data PDUs are formed from RLC SDUs received from upper layer only when a transmission opportunity has been notified by lower layer (i.e. by MAC) and are then delivered to lower layer; - RLC control PDUs are formed within RLC 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 TM RLC entity 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 : Model of two transparent mode peer entities A TM RLC entity delivers/receives the following RLC data PDU: - TMD PDU 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 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 UM RLC entity General An UM RLC entity can be configured to deliver/receive RLC PDUs through the following logical channels:

11 10 TS V8.2.0 ( ) - DL/UL DCCH, DL/UL DTCH, MCCH or MTCH. Figure : Model of two unacknowledged mode peer entities An UM RLC entity delivers/receives the following RLC data PDU: - UMD PDU 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 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 sequence; - 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:

12 11 TS V8.2.0 ( ) - if possible, reassemble RLC SDUs from the UMD PDUs that are received out of sequence and deliver them to upper layer; - discard any remaining UMD PDUs that could not be reassembled into RLC SDUs; - initialize relevant state variables and stop relevant timers AM RLC entity 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 Segmentation & Concatenation Retransmission buffer Remove RLC header Reception buffer & HARQ reordering Add RLC header Routing DCCH/DTCH DCCH/DTCH Figure : 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 Transmitting side When the transmitting side of an AM RLC entity forms AMD PDUs from RLC SDUs, it shall:

13 12 TS V8.2.0 ( ) - 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): - 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 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 Services provided to upper layers The following services are provided by RLC to upper layer (i.e. RRC or PDCP): - TM data transfer; - UM data transfer; - AM data transfer, including indication of successful delivery of upper layers PDUs 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; - notification of HARQ delivery failure from the transmitting MAC entity.

14 13 TS V8.2.0 ( ) 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); - in sequence delivery of upper layer 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 and recovery. 4.5 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 the status prohibit timer 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 TM data transfer Editor's note: It is intended to specify details regarding RLC PDU delivery to lower layer at the transmitter and RLC SDU delivery to upper layers at the receiver in this section (if the text in sub clause is insufficient) 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.

15 14 TS V8.2.0 ( ) 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. 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 ); - 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 ); 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 ) 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; - otherwise: - place the received UMD PDU in the reception buffer 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 sequence if not delivered before; - if VR(UR) falls outside of the reordering window: - set VR(UR) to (VR(UH) UM_Window_Size); - 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 sequence if not delivered before; - if T_reordering is running: - if VR(UX) <= VR(UR); or - if VR(UX) falls outside of the reordering window:

16 15 TS V8.2.0 ( ) - stop and reset T_reordering; - set VR(UX) to NULL; - 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) 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 sequence if not delivered before; - if VR(UH) > VR(UR): - start T_reordering; - set VR(UX) to VR(UH); - otherwise: - set VR(UX) to NULL. Editor's note: It is intended to specify details regarding RLC PDU generation and delivery to lower layer at the transmitter and RLC PDU reordering and loss detection (and duplicate detection if needed), RLC SDU reassembly and delivery to upper layers at the receiver in this section AM data transfer Transmit operations 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.

17 16 TS V8.2.0 ( ) When receiving a positive acknowledgement for an AMD PDU with SN = VT(A), the transmitting side of an AM RLC entity shall: - if positive acknowledgements have been received for all other AMD PDUs whose SN fall within the range VT(A) <= SN < VT(S), set VT(A) equal to VT(S); - otherwise, 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 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: - either discard the received RLC data PDU or place it in the reception buffer (see sub clause ); - 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 ). 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 ) 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; - otherwise: - 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 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 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):

18 17 TS V8.2.0 ( ) - 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 x >= VR(H) - update VR(H) to x+ 1; - if T_reordering is running: - if VR(X) = VR(R); or - if VR(X) falls outside of the receiving window: - stop and reset T_reordering; - set VR(X) to NULL; - if T_reordering is not running (includes the case T_reordering is stopped due to actions above): - if the VR (H) > VR(R): - start T_reordering; - set VR(X) to VR(H) 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); - otherwise: - set VR(X) to NULL. 5.2 ARQ procedures ARQ procedures are only performed by an AM RLC entity 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; - HARQ delivery failure from the transmitting MAC 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:

19 18 TS V8.2.0 ( ) - 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 receiving a negative acknowledgement for an AMD PDU or a portion of an AMD PDU by HARQ delivery failure notification from the transmitting MAC entity, the transmitting side of the AM RLC entity may: - 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 it is considered for retransmission for the first time: - set the RETX_COUNT associated with the AMD PDU to zero; - else, if it or a portion of it has been delivered to lower layers for transmission since the last increment of RETX_COUNT or RETX_COUNT = 0: - increment the RETX_COUNT; - if RETX_COUNT = Max_Retx_Threshold: - 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); - otherwise, segment the AMD PDU and 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. When retransmitting a portion of an AMD PDU, the transmitting side of an AM RLC entity shall: - segment the portion of the AMD PDU as necessary and 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. 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 Polling An AM RLC entity can poll its peer AM RLC entity in order to trigger STATUS reporting at the peer AM RLC entity. Triggers to initiate polling include: - Transmission of last data in the buffer: - The transmitting side of an AM RLC entity shall set the P field of an RLC data PDU to "1" 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; - Expiry of poll retransmit timer: - The transmitting side of an AM RLC entity shall:

20 19 TS V8.2.0 ( ) - upon delivering a RLC data PDU with the P field set to "1" to lower layer; - if T_poll_retransmit is not running: - start T_poll_retransmit; - store the SN = VT(S) - 1 in memory; - else: - restart T_poll_retransmit; - replace the stored SN in memory with the SN = VT(S) 1. - stop T_poll_retransmit when it receives either a positive or negative acknowledgement for the corresponding RLC data PDU with the SN it stored in memory; - when T_poll_retransmit expires: - if both the transmission buffer and the retransmission buffer are empty (excluding transmitted RLC data PDU awaiting for acknowledgements): - consider the AMD PDU with SN = VT(S) 1 for retransmission; - set the P field of the RLC data PDU to be transmitted in the next transmission opportunity to '1'; - else: - Every Poll_PDU PDUs: - set the P field of the RLC data PDU to be transmitted in the next transmission opportunity to '1'. - The transmitting side of an AM RLC entity shall: - maintain a counter PDU_WITHOUT_POLL, which is initially set to 0; - increment PDU_WITHOUT_POLL by one for every new AMD PDU that it forms; - set the P field of an AMD PDU that it forms to '1' when PDU_WITHOUT_POLL = Poll_PDU; - reset PDU_WITHOUT_POLL to 0 when it delivers to lower layer a RLC data PDU whose P field is set to '1'. - Every Poll_Byte bytes: - The transmitting side of an AM RLC entity shall: - maintain a counter BYTE_WITHOUT_POLL, which is initially set to 0; - increment BYTE_WITHOUT_POLL for every new byte of Data field element that it maps to the Data field of an AMD PDU; - set the P field of an AMD PDU that it forms to '1' when BYTE_WITHOUT_POLL >= Poll_Byte; - reset BYTE_WITHOUT_POLL to 0 when it delivers to lower layer a RLC data PDU whose P field is set to '1'. Editor's note: Whether or not the polling trigger 'Every Poll_PDU PDUs' and 'Every Poll_Byte bytes' are configurable or not is FFS. It has been decided that other polling triggers are always enabled 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.

21 20 TS V8.2.0 ( ) Triggers to initiate STATUS reporting include: - Polling from its peer AM RLC entity: - The receiving side of an AM RLC entity shall trigger a STATUS report when it receives a RLC data PDU with the P field set to "1" and the HARQ reordering of the corresponding RLC data PDU is completed. - 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: 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_status_prohibit 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_status_prohibit expires, construct a single STATUS PDU even if status reporting was triggered several times while T_status_prohibit was running and deliver it to lower layer; When a STATUS PDU has been delivered to lower layer, the receiving side of an AM RLC entity shall: - start T_status_prohibit. 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, starting with SN = VR(R) up to the SN for which the resulting STATUS PDU fits to the total size of RLC PDU(s) indicated by lower layer: - if no byte segments have been received yet for an AMD PDU: - include in the STATUS PDU a NACK_SN which is set to the SN of the AMD PDU; - else - include in the STATUS PDU a set of NACK_SN, SOstart and SOend for each consecutive byte segments of the AMD PDU that has not been received yet. - set the ACK_SN to the SN of the next not completely received AMD PDU which is not indicated with a NACK_SN 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 and UM RLC entities. When RRC indicates that an RLC entity should be re-established, the RLC entity shall: - 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 the reassembled RLC SDUs to upper layer if not delivered before;

22 21 TS V8.2.0 ( ) - discard all remaining UMD PDUs; - if it is a transmitting UM RLC entity: - 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 the reassembled RLC SDUs to upper layer 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. 5.5 Handling of unknown, unforeseen and erroneous protocol data Editor's note: Everything is FFS regarding this section, but it is intended to specify necessary details as discussions proceed. 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 are used by TM, UM and AM RLC entities to transfer upper layer PDUs (i.e. RLC SDUs). RLC control PDUs in sub clause are used by AM RLC entity to perform ARQ procedures 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 an AMD PDU segment or an AMD PDU with the need to perform re-segmentation RLC control PDU a) STATUS PDU

23 22 TS V8.2.0 ( ) STATUS PDU is used by the receiving AM RLC entity to inform the transmitting AM RLC entity about AMD PDUs that are received successfully, and AMD PDUs that are detected to be lost by the receiving AM RLC entity. 6.2 Formats and parameters The formats of RLC PDUs are described in sub clause and their parameters are described in sub clause Formats General RLC PDU is a bit string. In the figures in sub clause to , 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 TMD PDU TMD PDU consists only of a Data field and does not consist of any RLC headers. Figure : TMD PDU 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.

24 23 TS V8.2.0 ( ) Figure : UMD PDU with 5 bit SN (No LI) Figure : UMD PDU with 10 bit SN (No LI) 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. Figure : AMD PDU (No LI)

25 24 TS V8.2.0 ( ) Figure : AMD PDU (Odd number of LIs, i.e. K = 1, 3, 5, ) D/ C RF P FI E SN SN E LI1 LI1 E LI2 LI2 Oct 1 Oct 2 Oct 3 Oct 4 Oct 5 E LIK- 1 LIK- 1 E LIK Dat a LIK Oct [2+1.5* K- 2] Oct [2+1.5* K- 1] Oct [2+1.5* K] Oct [2+1.5* K+1] Oct N Figure : AMD PDU (Even number of LIs, i.e. K = 2, 4, 6, ) AMD PDU segment AMD PDU segment consists of a Data field and an AMD PDU segment header. 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.

26 25 TS V8.2.0 ( ) Figure : AMD PDU segment (No LI) Figure : AMD PDU segment (Odd number of LIs, i.e. K = 1, 3, 5, )

27 26 TS V8.2.0 ( ) D/ C RF P FI E SN LSF SO Oct 3 E LI1 SN SO LI2 LI1 E LI2 Oct 1 Oct 2 Oct 4 Oct 5 Oct 6 Oct 7 E LIK- 1 LIK- 1 E LIK Dat a LIK Oct [4+1.5* K- 2] Oct [4+1.5* K- 1] Oct [4+1.5* K] Oct [4+1.5* K+1] Oct N Figure : AMD PDU segment (Even number of LIs, i.e. K = 2, 4, 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 : STATUS PDU Parameters General In the definition of each field in sub clauses to , 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.

28 27 TS V8.2.0 ( ) 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; - When there are two RLC SDU segments, they belong to different RLC SDUs Sequence Number (SN) field Length: 10 bits for AMD PDU, AMD PDU segments and STATUS PDUs. 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 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 and Table Table : E field interpretation (for E field in the fixed part of the header) Value Description 0 Data field follows from the octet following the fixed part of the header 1 A set of E field and LI field follows from the octet following the fixed part of the header Table : E field interpretation (for E field in the extension part of the header) Value Description 0 Data field follows from the octet following the LI field following this E field 1 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.

29 28 TS V8.2.0 ( ) The LI field indicates the length in bytes of the corresponding Data field element present in the AMD PDU. The first LI present in the AMD PDU header corresponds to the first Data field element present in the Data field of the AMD PDU, the second LI present in the AMD PDU header corresponds to the second Data field element present in the Data of the AMD PDU, and so on 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 Table : FI field interpretation Value Description 00 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. 01 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. 10 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. 11 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 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 Table : LSF field interpretation Value Description 0 Last byte of the AMD PDU segment does not correspond to the last byte of an AMD PDU. 1 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

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