1、 ETSI TR 145 902 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE Flexible Layer One (FLO) (3GPP TR 45.902 version 14.0.0 Release 14) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 145 902 V14.0.0 (2017-04)13GPP TR 45.902 version 14.0.0 R
2、elease 14Reference RTR/TSGR-0645902ve00 Keywords GSM ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important n
3、otice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written author
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6、ng services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF ver
7、sion shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI regis
8、tered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TR 145 902 V14.0.0 (2017-04)23GPP TR 45.902 vers
9、ion 14.0.0 Release 14Intellectual 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: “
10、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 (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation,
11、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 Report (TR) has
12、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 ref
13、erence between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETS
14、I 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 ETSI TR 145 902 V14.0.0 (2017-04)33GPP TR 45.902 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Moda
15、l verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 7g34 Motivation 8g35 Requirements 8g36 Overview of FLO . 9g36.1 General . 9g36.2 Principles of FLO . 9g36.3 Evolution from Release 5 .
16、9g36.4 Limitations . 10g36.5 Protocol architecture. 10g36.5.1 Iu mode . 10g36.5.2 A/Gb mode 11g36.5.3 TBF configuration principles 11g37 Layer 1 for FLO . 11g37.1 CRC Attachment 12g37.2 Channel Coding 13g37.3 Rate Matching 13g37.4 Transport Channel Multiplexing 16g37.4a Inband signalling bits . 16g3
17、7.5 Transport Format Combination Identifier (TFCI) 16g37.6 Interleaving. 17g37.7 Signalling on HR Channels 18g38 Layer 2 for FLO . 19g38.1 Protocol architecture in Iu mode . 19g38.1.1 General 19g38.1.2 RLC protocol 20g38.1.3 MAC protocol . 20g38.2 Protocol architecture in A/Gb mode . 20g38.3 RLC/MAC
18、 block structure . 20g38.3.1 General 20g38.3.2 RLC/MAC blocks for control message transfer 21g38.3.2.1 Downlink RLC/MAC control block format 21g38.3.2.2 Uplink RLC/MAC control block format . 21g38.3.3 RLC/MAC blocks for data transfer . 21g38.3.3.1 Downlink RLC/MAC block for data transfer 21g38.3.3.1
19、.1 RLC unacknowledged mode . 21g38.3.3.1.2 RLC acknowledged mode . 22g38.3.3.1.3 RLC transparent mode . 22g38.3.3.2 Uplink RLC/MAC block for data transfer 22g38.3.3.2.1 RLC unacknowledged mode . 22g38.3.3.2.2 RLC acknowledged mode . 22g38.3.3.2.3 RLC transparent mode . 23g38.4 Ciphering in Iu mode 2
20、3g3ETSI ETSI TR 145 902 V14.0.0 (2017-04)43GPP TR 45.902 version 14.0.0 Release 148.4.1 General 23g38.4.2 Parameters settings . 23g38.4.2.1 RLC non-transparent mode . 23g38.4.2.2 RLC transparent mode 23g38.4.2.3 RLC/MAC control messages 24g38.5 TFC Selection . 24g38.5.1 TFC selection in the uplink .
21、 24g38.5.2 TFC selection in the downlink 24g38.6 Ciphering in A/Gb mode . 24g39 Layer 3 for FLO . 25g39.1 In Iu mode. 25g39.2 In A/Gb mode . 25g39.3 Transport and physical channel configuration 25g39.4 Calculated Transport Format Combination 26g39.4.1 Definition 26g39.4.2 Example 27g39.5 TFC for Sig
22、nalling 28g39.6 TBF configuration 28g310 Testing of FLO . 28g311 Impact on Specifications 29g3Annex A (informative): Block Codes for the TFCI . 30g3Annex B (informative): Header fields . 32g3B.1 Payload Type (PT) field . 32g3B.2 Polling (P) bit . 32g3B.3 Segmentation (S) bit . 32g3B.4 Reduced Block
23、Sequence Number (RBSN) bit 32g3B.5 Radio Transaction Identifier (RTI) field 32g3B.6 Temporary Flow Identity (TFI) field 33g3B.7 Block Sequence Number (BSN) field 33g3B.7.1 General 33g3B.7.2 RLC unacknowledged mode . 33g3B.7.3 RLC acknowledged mode . 33g3B.8 Split Block Indicator (SPB) field . 33g3B.
24、9 Stall Indicator (SI) field 33g3B.10 Extension (E) bit . 33g3B.11 Length Indicator (LI) field 34g3Annex C: Change history 35g3History 36g3ETSI ETSI TR 145 902 V14.0.0 (2017-04)53GPP TR 45.902 version 14.0.0 Release 14Foreword This Technical Report has been produced by the 3rdGeneration Partnership
25、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
26、 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, cor
27、rections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction A new type of physical layer is proposed for the GSM/EDGE Radio Access Network (GERAN): the flexible layer one (FLO). The main advantage of FLO is that the config
28、uration of the physical layer (e.g. channel coding and interleaving) is specified at call setup. This means that the support of new services such as IP Multimedia Subsystem (IMS) services can be handled smoothly without having to specify new coding schemes in each release. Through several enhancemen
29、ts such as reduced granularity and flexible interleaving, the radio bearers offered by FLO would not only fulfil the IMS requirements in terms of flexibility and performance, but also greatly improve the link level performance of real-time IMS services compared to GERAN Release 5. The objective of t
30、his TR is to provide an overview of FLO, its architecture and study the impacts it has on the GERAN radio protocol stack. ETSI ETSI TR 145 902 V14.0.0 (2017-04)63GPP TR 45.902 version 14.0.0 Release 141 Scope The present document provides an overview of the flexible layer one, its architecture and s
31、tudies the impacts it has on the GERAN radio protocol stack. 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 numbe
32、r, 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
33、 in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications”. 2 3GPP TS 22.101, “Service Principles”. 3 3GPP TS 22.228, “Service requirements for the IP Multimedia Core Network Subsystem”. 4 3GPP TS 23.107, “QoS Concept and Architecture”. 5 3GPP TS 23.228, “IP
34、 Multimedia Subsystem”. 6 3GPP TS 25.201, “Physical layer - General description”. 7 3GPP TS 25.212, “Multiplexing and channel coding (FDD)”. 8 3GPP TS 25.331, “RRC Protocol Specification”. 9 3GPP TS 32.201, “Specification of the 3GPP Confidentiality and Integrity Algorithms”. 10 3GPP TS 44.018: “Rad
35、io Resource Control protocol”. 11 3GPP TS 44.118: “Radio Resource Control protocol, Iu mode”. 12 3GPP TS 44.060: “Radio Link Control/Medium Access Control protocol”. 13 3GPP TS 44.160: “Radio Link Control/Medium Access Control protocol, Iu mode”. 14 3GPP TS 45.002: “Multiplexing and multiple access
36、on the radio path”. 15 3GPP TS 45.003: “Channel Coding”. 16 3GPP TS 45.005: “Radio transmission and reception”. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. Active Transport Channel: a transport channel
37、is active during a TTI if it carries a transport block. ETSI ETSI TR 145 902 V14.0.0 (2017-04)73GPP TR 45.902 version 14.0.0 Release 14Dynamic attributes: for one transport channel, the values of the dynamic attributes are different among transport formats. They are configured by Layer 3 and can cha
38、nge on a TTI basis under the control of the MAC sublayer. Empty Transport Format: a transport format such that no transport block is carried over the transport channel (i.e. the transport channel is inactive). Empty Transport Format Combination: a transport format combination that is made up only of
39、 empty transport formats. Inactive Transport Channel: a transport channel is inactive during a TTI if it does not carry a transport block (i.e. the transport block size is zero). Radio Frame: The result of applying rate matching to a transport block along with its associated CRC that have first been
40、 channel encoded. Radio Packet: The set of one or more radio frames together with the applicable coded TFCI that form the volume of payload that can be transmitted on a basic physical subchannel for any given TTI. Semi-static attributes: for one transport channel, the values of the semi-static attri
41、butes are common to all transport formats. They are configured by Layer 3 and can only be changed by Layer 3 signalling. Transport Block: block exchanged on a transport channel between the physical layer and the MAC sublayer. Transport Channel: SAP between the physical layer and the MAC sublayer. Tr
42、ansport Format: configuration of a transport channel, including for instance channel coding, CRC size, etc. Transport Format Combination: allowed combination of transport format(s) of the different transport channels that are multiplexed together on a basic physical subchannel. Transport Format Comb
43、ination Indicator: layer one header that indicates the transport format combination that has been selected for each radio packet. Transport Format Combination Set: set of allowed transport format combinations on a basic physical subchannel. Transport Format Indicator: index identifying a particular
44、transport format within the transport format set. Transport Format Set: set of all transport formats defined for a particular transport channel. Transmission Time Interval: rate at which transport blocks are exchanged between the physical layer and the MAC sublayer on a transport channel. 3.2 Abbrev
45、iations For the purposes of the present document, the following abbreviations apply: ADCH Associated Dedicated CHannel CCTrCH Coded Composite Transport CHannel CDCH Control-plane Dedicated CHannel CTFC Calculated Transport Format Combinations DCH Dedicated CHannel FLO Flexible Layer OneGERAN GSM/EDG
46、E Radio Access Network IMS IP Multimedia Subsystem MAC Medium Access Control QoS Quality of Service PDU Protocol Data Unit RAN Radio Access Network RLC Radio Link Control RRC Radio Resource Control RT Real Time SDU Service Data Unit SAP Service Access PointTB Transport Block ETSI ETSI TR 145 902 V14
47、.0.0 (2017-04)83GPP TR 45.902 version 14.0.0 Release 14TBF Temporary Block Flow TF Transport Format TFI Temporary block Flow Identity TFS Transport Format Set TFIN Transport Format INdicator TFC Transport Format Combination TFCI Transport Format Combination Indicator TFCS Transport Format Combinatio
48、n Set TrCH Transport Channel TTI Transmission Time Interval UDCH User-plane Dedicated CHannel UTRAN Universal Terrestrial Radio Access Network Other abbreviations used in the present document are listed in 3GPP TR 21.905. 4 Motivation The need for a flexible layer one for the Release 6 of GERAN is d
49、riven by the introduction of IMS services. For an efficient support of IMS services, requirements are set on the radio bearer service of the RAN (see 3GPP TS 22.101, 3GPP TS 22.228, 3GPP TS 23.228 and 3GPP TS 23.107): - the radio bearers should be flexible enough to efficiently deploy any IP multimedia applications; - the radio bearers should allow the transport of several flows in parallel (e.g. text and video); - the radio bearers should satisfy the user in a spectral efficient manner; - the radio bearer should support the UMTS QoS conc
