1、ETSI TR 125 950 V4.0.0 (2001-03) Technical Report Universal Mobile Telecommunications System (UMTS); UTRA high speed downlink packet access (3GPP TR 25.950 version 4.0.0 Release 4) COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 versio
2、n 4.0.0 Release 4 1 Reference DTWTSGR-0225950Uv4 Keywords UMTS ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 O0017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88
3、 Important notice ETSI TR 125 950 V4.0.0 (2001-03) Individual copies of the present document can be downloaded from: htttx/w.etsi. org The present document may be made available in more than one electronic version or in print. In any ase of existing c perceived difference in contents between such ve
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6、ritten permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2001. All rights reserved. ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 versi
7、on 4.0.0 Release 4 2 ETSI TR 125 950 V4.0.0 (2001-03) 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 c
8、an be found in ETSI SR O00 3 14: “Intellectual Property Rights (IPRs); Essential, orpotentially Essential, IPRs notjed to ETSI in respect OfETSIstandards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (-). Pursuant to the ETSI IPR Policy, no inves
9、tigation, 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 O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Repor
10、t (TR) has been produced by the ETSI 3d 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.
11、 The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under www.etsi.ordkey . ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 version 4.0.0 Release 4 3 ETSI TR 125 950 V4.0.0 (2001-03) Contents Foreword 5 1
12、 2 3 4 5 5.1 5.2 5.3 5.4 5.5 6 6.1 6.2 6.3 6.3.1 6.3.2 6.4 6.5 6.6 7 7.1 7.2 7.3 7.4 8 8.1 8.1.1 8.1.2 8.2 8.3 8.4 8.4.1 8.4.2 8.4.3 8.5 8.6 8.7 9 9.1 9.2 9.2.1 9.2.2 Scope . 6 References . 6 Void . 6 Background and Introduction 6 Overview of Techniques considered to support UTRA High Speed Downlink
13、 Packet Access 7 7 7 8 8 8 Basic structure of HS-DSCH . 8 Architecture Issues . 8 Protocol structure . 9 Basic physical structure 9 HSDPA physical-layer structure in the code domain . 10 HSDPA physical-layer structure in the time domain 11 Transport channel structure 11 Impact on Interfaces . 11 Con
14、clusions 11 Adaptive Modulation and Coding Schemes (AMCS) . 12 Technical Details 12 Performance Evaluation . 12 Complexity Evaluation . 12 Conclusions 13 Enablers for Hybrid ARQ Existing Architecture Distributed Architecture . 17 Performance Evaluation . 19 Complexity Evaluation . 19 Conclusions 20
15、Fast Cell Selection . 20 Principle . 20 Description of different schemes 20 Intra-Node B FCS . 20 Inter-Node B FCS 20 MAC-HS-DSCH . 18 9.2.2.1 Queue Management 20 9.2.2.1.1 Option 1 - Ov 21 9.2.2.1.2 Option 2 -Ne 21 9.2.2.2 Impact of inter-node FCS on HAR 21 9.3 Potential b 21 9.4 Impact on 21 9.5 C
16、onclusions 22 ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 version 4.0.0 Release 4 4 ETSI TR 125 950 V4.0.0 (2001-03) 1 O 10.1 11 Multiple Input Multiple Output Antenna Processing . . . . . . . . . . . . . . . . . . . . . . . .
17、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 . .22 Associated signalling needed for HS-DSCH operation for High Speed Downlink Packet Access . 22 1 1.1 Associated Uplink signalling . .22 1 1.1.1 Scheduling assistance inform . .22 11.1.2 SAW-H
18、ARQ . . . .22 1 1.1.3 Fast Cell Selectio . . . .22 11.2 Associated Downlink s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 1 1.
19、2.1 Adaptive Modulation a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 11.2.2 SAW-HARQ . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 11.3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . 23 12 Standalone DSCH 23 12.1 Notion of standalone DSCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 12.2 Impacts on radio protocols . . . . . . . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 12.3 Impacts onUE . .24 12.4 Coexistence with R99 . . . . .24 12.5 Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 13 System Simulation
23、 Results 24 13.1 HSDPA Baseline Performance (AMC, HARQ, FCS, Fast Scheduler, 3.33ms frame) vs. R99 24 13.2 Integrated Voice and Data Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 14 Conclusions . 25 14.1 Recommendations Conclusions . . . . . . . . .
24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . Annex A: Change history 27 ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 version 4.0.0 Release 4 5 ETSI TR 125 950 V4.0.0 (2001-03) Foreword This Technical Report has been produced by the 3d
26、 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 modifi the contents of the present document, it will be re-released by the TSG with an identifiing change of release
27、 date and an increase in version number as follows: Version x.y.z where : x the fiist 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. te
28、chnical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 version 4.0.0 Release 4 6 ETSI T
29、R 125 950 V4.0.0 (2001-03) 1 Scope The present document describes several techniques, which facilitate high-speed downlink packet access. Furthermore, it describes how these concepts should be integrated into the overall architecture of UTRA. The techniques should be applicable to streaming, interac
30、tive and background services. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document . 31 41 References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
31、 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 t
32、heyresent document. 51 3GPP TR 25.848: “HSDPA RAN WG1 Feasibility Study report“. TSGR1#12(00) 0556, “Feasibility study of Advanced techniques for High Speed Downlink Packet Access“, Motorola. SMG2 UMTS L1 682/98, “Channel Bandwidth Allocation Strategy“, Motorola. Ghosh et al, “Performance of Coded H
33、igher Order Modulation and Hybrid ARQ for Next Generation Cellular CDMA Systems“, Vehicular Technology Conference Fall 2000, Sept 24th 2Sth, 2000, Boston, Massachusetts, USA. D. Bertsekas, R. Gallager, Data Networks Second Edition, Prentice Hall, Englewood Cliffs, New Jersey. R2AO 100 16: “Dual-Chan
34、nel Stop-and-Wait HARQ“, Motorola. R2AO10017: “Fast Cell Selection and Handovers in HSDPA“, Motorola. R2AO 10004: “Proposed way forward with HSDPA“, Nokia. R2AO10002: “Support of standalone carrier for DSCH“, Norte1 R2AO10021: “ARQ Technique for HSDPA“, Lucent. R2A010015: “HSDPA Signaling Requiremen
35、ts“, Motorola. R2-O 10493 : “HSDPA Signalling requirements for TDD mode“, Siemens. R2A010010: “HSDPA Radio Interface Protocol Architecture I, Ericsson, Motorola. 3 Void 4 Background and Introduction In RAN#7 plenary meeting a work item was approved for “Feasibility study for high speed downlink pack
36、et access“ The work item is a feasibility study, where techniques like adaptive modulation and coding, hybrid ARQ and other ETSI COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services3GPP TR 25.950 version 4.0.0 Release 4 7 ETSI TR 125 950 V4.0.0 (2001-03)
37、 advanced features are discussed and evaluated with the goal to increase throughput, reduce delay and achieve high peak rates. 5 Overview of Techniques considered to support UTRA High Speed Downlink Packet Access 5.1 Adaptive modulation and Coding Schemes In cellular communication systems, the quali
38、ty of a signal received by a UE depends on number of factors-the distance between the desired and interfering base stations, path loss exponent, log-normal shadowing, short term Rayleigh fading and noise. In order to improve system capacity, peak data rate and coverage reliability, the signal transm
39、itted to and by a particular user is modified to account for the signal quality variation through a process commonly referred to as link adaptation. Traditionally, CDMA systems have used fast power control as the preferred method for link adaptation. Recently, Adaptation Modulation and Coding (AMC)
40、2 have offered an alternative link adaptation method that promises to raise the overall system capacity. AMC provides the flexibility to match the modulation-coding scheme to the average channel conditions for each user. With AMC, the power of the transmitted signal is held constant over a frame int
41、erval, and the modulation and coding format is changed to match the current received signal quality or channel conditions. In a system with AMC, users close to the base station (BTS) are typically assigned higher order modulation with higher code rates (e.g. 64 QAM with R=3/4 turbo codes), but the m
42、odulation-order andor code rate will decrease as the distance from BTS increases. AMC is most effective when combined with fat-pipe scheduling techniques such as those enabled by the Downlink Shared Channel. On top of the benefits attributed to fat-pipe multiplexing 3, AMC combined with time domain
43、scheduling offers the opportunity to take advantage of short term variations in a UEs fading envelope so that a UE is always being served on a constructive fade. 5.2 SAW-Hybrid ARQ H-ARQ is an implicit link adaptation technique. Whereas, in AMC explicit C/I measurements or similar measurements are u
44、sed to set the modulation and coding format, in H-ARQ, link layer acknowledgements are used for re-transmission decisions. There are many schemes for implementing H-ARQ - Chase combining, Rate compatible Punctured Turbo codes and Incremental Redundancy. Incremental redundancy or H-ARQ-type-II is ano
45、ther implementation of the H- ARQ technique wherein instead of sending simple repeats of the entire coded packet, additional redundant information is incrementally transmitted if the decoding fails on the fiist attempt. H-ARQ-type-III also belongs to the class of incremental redundancy ARQ schemes.
46、However, with H-ARQ-type-III, each retransmission is self-decodable which is not the case with H-ARQ-type II. Chase combining (also called H-ARQ- type-III with one redundancy version) involves the retransmission by the transmitter of the same coded data packet. The decoder at the receiver combines t
47、hese multiple copies of the transmitted packet weighted by the received SNR. Diversity (time) gain is thus obtained. In the H-ARQ-type-III with multiple redundancy versions different puncture bits are used in each retransmission. AMC by itself does provide some flexibility to choose an appropriate M
48、CS for the channel conditions based on measurements either based on UE measurement reports or network determined. However, an accurate measurement is required and there is an effect of delay. Also, an ARQ mechanism is still required. H-ARQ autonomously adapts to the instantaneous channel conditions
49、and is insensitive to the measurement error and delay. Combining AMC with H-ARQ leads to the best of both worlds - AMC provides the coarse data rate selection, while H-ARQ provides for fine data rate adjustment based on channel conditions. The choice of H-ARQ mechanism however is important. There are two main ARQ mechanisms - selective repeat (SR) and stop-and-wait (SAW). In SR, only erroneous blocks are re-transmitted.
