1、 ETSI TR 145 902 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE Flexible Layer One (FLO) (3GPP TR 45.902 version 15.0.0 Release 15) TECHNICAL REPORT GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TR 145 902 V15.0.0 (2018-07)13GPP TR 45.902 version 15.0.0 R
2、elease 15Reference RTR/TSGR-0645902vf00 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
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9、45.902 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables 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
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14、chnical 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 http:/webapp.etsi.org/key/query
15、form.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 ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allow
16、ed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 145 902 V15.0.0 (2018-07)33GPP TR 45.902 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbol
17、s and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 7g34 Motivation 8g35 Requirements 8g36 Overview of FLO . 8g36.1 General . 8g36.2 Principles of FLO . 9g36.3 Evolution from Release 5 . 9g36.4 Limitations . 9g36.5 Protocol architecture. 10g36.5.1 Iu mode . 10g36.5.2 A/Gb mode 10g36.5.3
18、TBF configuration principles 11g37 Layer 1 for FLO . 11g37.1 CRC Attachment 12g37.2 Channel Coding 12g37.3 Rate Matching 12g37.4 Transport Channel Multiplexing 15g37.4a Inband signalling bits . 15g37.5 Transport Format Combination Identifier (TFCI) 15g37.6 Interleaving. 16g37.7 Signalling on HR Chan
19、nels 17g38 Layer 2 for FLO . 18g38.1 Protocol architecture in Iu mode . 18g38.1.1 General 18g38.1.2 RLC protocol 19g38.1.3 MAC protocol . 19g38.2 Protocol architecture in A/Gb mode . 19g38.3 RLC/MAC block structure . 19g38.3.1 General 19g38.3.2 RLC/MAC blocks for control message transfer 20g38.3.2.1
20、 Downlink RLC/MAC control block format 20g38.3.2.2 Uplink RLC/MAC control block format . 20g38.3.3 RLC/MAC blocks for data transfer . 20g38.3.3.1 Downlink RLC/MAC block for data transfer 20g38.3.3.1.1 RLC unacknowledged mode . 20g38.3.3.1.2 RLC acknowledged mode . 21g38.3.3.1.3 RLC transparent mode
21、. 21g38.3.3.2 Uplink RLC/MAC block for data transfer 21g38.3.3.2.1 RLC unacknowledged mode . 21g38.3.3.2.2 RLC acknowledged mode . 21g38.3.3.2.3 RLC transparent mode . 22g38.4 Ciphering in Iu mode 22g3ETSI ETSI TR 145 902 V15.0.0 (2018-07)43GPP TR 45.902 version 15.0.0 Release 158.4.1 General 22g38.
22、4.2 Parameters settings . 22g38.4.2.1 RLC non-transparent mode . 22g38.4.2.2 RLC transparent mode 22g38.4.2.3 RLC/MAC control messages 22g38.5 TFC Selection . 23g38.5.1 TFC selection in the uplink . 23g38.5.2 TFC selection in the downlink 23g38.6 Ciphering in A/Gb mode . 23g39 Layer 3 for FLO . 24g3
23、9.1 In Iu mode. 24g39.2 In A/Gb mode . 24g39.3 Transport and physical channel configuration 24g39.4 Calculated Transport Format Combination 25g39.4.1 Definition 25g39.4.2 Example 26g39.5 TFC for Signalling 27g39.6 TBF configuration 27g310 Testing of FLO . 27g311 Impact on Specifications 27g3Annex A
24、(informative): Block Codes for the TFCI . 29g3Annex B (informative): Header fields . 31g3B.1 Payload Type (PT) field . 31g3B.2 Polling (P) bit . 31g3B.3 Segmentation (S) bit . 31g3B.4 Reduced Block Sequence Number (RBSN) bit 31g3B.5 Radio Transaction Identifier (RTI) field 31g3B.6 Temporary Flow Ide
25、ntity (TFI) field 31g3B.7 Block Sequence Number (BSN) field 32g3B.7.1 General 32g3B.7.2 RLC unacknowledged mode . 32g3B.7.3 RLC acknowledged mode . 32g3B.8 Split Block Indicator (SPB) field . 32g3B.9 Stall Indicator (SI) field 32g3B.10 Extension (E) bit . 32g3B.11 Length Indicator (LI) field 32g3Ann
26、ex C: Change history 33g3History 34g3ETSI ETSI TR 145 902 V15.0.0 (2018-07)53GPP TR 45.902 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and
27、 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
28、; 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 incorpo
29、rated 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 configuration of the physical layer (e.g. channel coding and interleaving) is specified at call setup. This
30、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 enhancements such as reduced granularity and flexible interleaving, the radio bearers offered by FLO would not o
31、nly 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 this TR is to provide an overview of FLO, its architecture and study the impacts it has on the GERAN ra
32、dio protocol stack. ETSI ETSI TR 145 902 V15.0.0 (2018-07)63GPP TR 45.902 version 15.0.0 Release 151 Scope The present document provides an overview of the flexible layer one, its architecture and studies the impacts it has on the GERAN radio protocol stack. 2 References The following documents cont
33、ain 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
34、-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 Specificati
35、ons“. 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 Multimedia Subsystem“. 6 3GPP TS 25.201, “Physical layer - General description“. 7 3GPP TS 25.2
36、12, “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: “Radio Resource Control protocol“. 11 3GPP TS 44.118: “Radio Resource Control protocol, Iu mode“. 12
37、 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 on the radio path“. 15 3GPP TS 45.003: “Channel Coding“. 16 3GPP TS 45.005: “Radio transmission
38、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 is active during a TTI if it carries a transport block. Dynamic attributes: for one transport ch
39、annel, the values of the dynamic attributes are different among transport formats. They are configured by Layer 3 and can change on a TTI basis under the control of the MAC sublayer. ETSI ETSI TR 145 902 V15.0.0 (2018-07)73GPP TR 45.902 version 15.0.0 Release 15Empty Transport Format: a transport fo
40、rmat 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 empty transport formats. Inactive Transport Channel: a transport channel is inactive during a T
41、TI 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 channel encoded. Radio Packet: The set of one or more radio frames together with the applicable
42、 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 attributes are common to all transport formats. They are configured by Layer 3 and can only be change
43、d 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. Transport Format: configuration of a transport channel, including for instance channel coding, CRC
44、 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 Combination Indicator: layer one header that indicates the transport format combination that has bee
45、n 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 transport format within the transport format set. Transport Format Set: set of all transport for
46、mats 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 Abbreviations For the purposes of the present document, the following abbreviations apply: ADCH Associ
47、ated 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/EDGE Radio Access Network IMS IP Multimedia Subsystem MAC Medium Access Control QoS Quality of Serv
48、ice 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 TBF Temporary Block Flow TF Transport Format TFI Temporary block Flow Identity TFS Transport Format Set ETSI ETSI TR 145
49、 902 V15.0.0 (2018-07)83GPP TR 45.902 version 15.0.0 Release 15TFIN Transport Format INdicator TFC Transport Format Combination TFCI Transport Format Combination Indicator TFCS Transport Format Combination 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 driven by the introduction of IMS services. For
