1、 ETSI TS 101 851-3 V1.2.1 (2006-01)Technical Specification Satellite Earth Stations and Systems (SES);Satellite Component of UMTS/IMT2000;G-family;Part 3: Spreading and modulation(S-UMTS-A 25.213)ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 2 Reference RTS/SES-00255-3 Keywords MES, MSS, satellite, UMTS E
2、TSI 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 notice Individual copies of the present document can be
3、 downloaded from: http:/www.etsi.org 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 ref
4、erence shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI 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 ETSI document
5、s is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permiss
6、ion. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Mar
7、ks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 6
8、 2 References 6 3 Symbols and abbreviations.6 3.1 Symbols6 3.2 Abbreviations .7 4 Uplink spreading and modulation 7 4.1 Overview 7 4.2 Spreading7 4.2.1 DPCCH/DPDCH 7 4.2.2 PRACH.9 4.2.2.1 PRACH preamble part 9 4.2.2.2 PRACH message part9 4.3 Code generation and allocation 10 4.3.1 Channelization cod
9、es 10 4.3.1.1 Code definition10 4.3.1.2 Code allocation for DPCCH/DPDCH .11 4.3.1.3 Code allocation for PRACH message part 11 4.3.2 Scrambling codes11 4.3.2.1 General11 4.3.2.2 Long scrambling sequence11 4.3.2.3 Short scrambling sequence13 4.3.2.4 DPCCH/DPDCH scrambling code14 4.3.2.5 PRACH message
10、part scrambling code.14 4.3.3 PRACH preamble codes .15 4.3.3.1 Preamble code construction 15 4.3.3.2 Preamble scrambling code 15 4.3.3.3 Preamble signature15 4.4 Modulation .16 4.4.1 Modulating chip rate.16 4.4.2 Modulation16 5 Downlink spreading and modulation .17 5.1 Spreading17 5.2 Code generatio
11、n and allocation 18 5.2.1 Channelization codes 18 5.2.2 Scrambling code .18 5.2.3 Synchronization codes 20 5.2.3.1 Code generation 20 5.2.3.2 Code allocation of SSC .21 5.3 Modulation .23 5.3.1 Modulating chip rate.23 5.3.2 Modulation23 Annex A (informative): Generalized Hierarchical Golay Sequences
12、.24 A.1 Alternative generation 24 Annex B (informative): Bibliography.25 History 26 ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPR
13、s, 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 ava
14、ilable on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). 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 s
15、erver) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The present document is specifying the Satellite Radio Interface referenced as SRI Famil
16、y G at ITU-R, in the frame of the modification of ITU-R Recommendation M.1457-5. This modification has been approved at SG8 meeting in November 2005. The contents of the present document are subject to continuing work within TC-SES and may change following formal TC-SES approval. Should TC-SES modif
17、y the contents of the present document it will then be republished by ETSI with an identifying change of release date and an increase in version number as follows: Version 1.m.n Where: the third digit (n) is incremented when editorial only changes have been incorporated in the specification; the sec
18、ond digit (m) is incremented for all other types of changes, i.e. technical enhancements, corrections, updates, etc. The present document is part 3 of a multi-part deliverable covering Satellite Earth Stations and Systems (SES); Satellite Component of UMTS/IMT2000; G-family, as identified below: Par
19、t 1: “Physical channels and mapping of transport channels into physical channels (S-UMTS-A 25.211)“; Part 2: “Multiplexing and channel coding (S-UMTS-A 25.212)“; Part 3: “Spreading and modulation (S-UMTS-A 25.213)“; Part 4: “Physical layer procedures (S-UMTS-A 25.214)“; Part 5: “UE Radio Transmissio
20、n and Reception“; Part 6: “Ground stations and space segment radio transmission and reception“. Introduction S-UMTS stands for the Satellite component of the Universal Mobile Telecommunication System. S-UMTS systems will complement the terrestrial UMTS (T-UMTS) and inter-work with other IMT-2000 fam
21、ily members through the UMTS core network. S-UMTS will be used to deliver 3rdgeneration Mobile Satellite Services (MSS) utilizing either low (LEO) or medium (MEO) earth orbiting, or geostationary (GEO) satellite(s). S-UMTS systems are based on terrestrial 3GPP specifications and will support access
22、to GSM/UMTS core networks. NOTE 1: The term T-UMTS will be used in the present document to further differentiate the Terrestrial UMTS component. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 5 Due to the differences between terrestrial and satellite channel characteristics, some modifications to the terre
23、strial UMTS (T-UMTS) standards are necessary. Some specifications are directly applicable, whereas others are applicable with modifications. Similarly, some T-UMTS specifications do not apply, whilst some S-UMTS specifications have no corresponding T-UMTS specification. Since S-UMTS is derived from
24、T-UMTS, the organization of the S-UMTS specifications closely follows the original 3rdGeneration Partnership Project (3GPP) structure. The S-UMTS numbers have been designed to correspond to the 3GPP terrestrial UMTS numbering system. All S-UMTS specifications are allocated a unique S-UMTS number as
25、follows: S-UMTS-n xx.yyy Where: The numbers xx and yyy correspond to the 3GPP numbering scheme. n (n = A, B, C, ) denotes the family of S-UMTS specifications. An S-UMTS system is defined by the combination of a family of S-UMTS specifications and 3GPP specifications, as follows: If an S-UMTS specifi
26、cation exists it takes precedence over the corresponding 3GPP specification (if any). This precedence rule applies to any references in the corresponding 3GPP specifications. NOTE 2: Any references to 3GPP specifications within the S-UMTS specifications are not subject to this precedence rule. EXAMP
27、LE: An S-UMTS specification may contain specific references to the corresponding 3GPP specification. If an S-UMTS specification does not exist, the corresponding 3GPP specification may or may not apply. The exact applicability of the complete list of 3GPP specifications shall be defined at a later s
28、tage. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 6 1 Scope The present document describes spreading and modulation for the Physical Layer for family G of the satellite component of UMTS (S-UMTS-G). It is based on the FDD mode of UTRA defined by TS 125 211 1, TS 125 212 2, TS 125 213 3, TS 125 214 4 and
29、 adapted for operation over satellite transponders. 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 and/or edition number or version number)
30、 or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 ETSI TS 125 211: “U
31、niversal Mobile Telecommunications System (UMTS); Physical channels and mapping of transport channels onto physical channels (FDD) (3GPP TS 25.211)“. 2 ETSI TS 125 212: “Universal Mobile Telecommunications System (UMTS); Multiplexing and channel coding (FDD) (3GPP TS 25.212)“. 3 ETSI TS 125 213: “Un
32、iversal Mobile Telecommunications System (UMTS); Spreading and modulation (FDD) (3GPP TS 25.213)“. 4 ETSI TS 125 214: “Universal Mobile Telecommunications System (UMTS); Physical layer procedures (FDD) (3GPP TS 25.214)“. 5 ITU-R Recommendation M.1457-6: “Draft revision of Recommendation ITU-R M.1457
33、-6 - Detailed specifications of the radio interfaces of International Mobile Telecommunications-2000 (IMT-2000)“. 3 Symbols and abbreviations 3.1 Symbols For the purposes of the present document, the following symbols apply: Cch,SF,n: n:th channelization code with spreading factor SF Cpre,n,s: PRACH
34、 preamble code for n:th preamble scrambling code and signature s Csig,s: PRACH/PCPCH signature code for signature s Sdpch,n: n:th DPCCH/DPDCH uplink scrambling code Sr-pre,n: n:th PRACH preamble scrambling code Sr-msg,n: n:th PRACH message scrambling code Sdl,n: DL scrambling code Cpsc: PSC code Css
35、c,n: n:th SSC code ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 7 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AICH Acquisition Indicator CHannel CCPCH Common Control Physical CHannel CPICH Common PIlot CHannel DCH Dedicated CHannel DPCCH Dedicated Physic
36、al Control CHannel DPCH Dedicated Physical CHannel DPDCH Dedicated Physical Data CHannel DTX Discontinuous Transmission FDD Frequency Division Duplex GEO Geostationary Earth Orbit LEO Low Earth Orbit Mcps Mega chip per second MEO Medium Earth Orbit MICH MBMS Indication CHannel MSS Mobile Satellite S
37、ervices OVSF Orthogonal Variable Spreading Factor (codes) PICH Page Indication CHannel PRACH Physical Random Access CHannel PSC Primary Synchronization Code QPSK Quaternary Phase Shift Keying SCH Synchronization CHannel SF Spreading Factor SSC Secondary Synchronization Code USRAN UMTS Satellite Radi
38、o Access Network UTRA UMTS Terrestrial Radio Access 4 Uplink spreading and modulation 4.1 Overview Spreading is applied to the physical channels. It consists of two operations. The first is the channelization operation, which transforms every data symbol into a number of chips, thus increasing the b
39、andwidth of the signal. The number of chips per data symbol is called the Spreading Factor (SF). The second operation is the scrambling operation, where a scrambling code is applied to the spread signal. With the channelization, data symbols on so-called I- and Q-branches are independently multiplie
40、d with an OVSF code. With the scrambling operation, the resultant signals on the I- and Q-branches are further multiplied by complex-valued scrambling code, where I and Q denote real and imaginary parts, respectively. 4.2 Spreading 4.2.1 DPCCH/DPDCH Figure 1 illustrates the principle of the uplink s
41、preading of DPCCH and DPDCHs. The binary DPCCH and DPDCHs to be spread are represented by real-valued sequences, i.e. the binary value “0“ is mapped to the real value +1, and the binary value “1“ is mapped to the real value -1. The DPCCH is spread to the chip rate by the channelization code cc. The
42、n:th DPDCH called DPDCHnis spread to the chip rate by the channelization code cd,n. One DPCCH, up to six parallel DPDCHs, i.e. 1 n 6. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 8 Ijcd,1dSdpch,nI+jQDPDCH1Qcd,3dDPDCH3cd,5dDPDCH5cd,2dDPDCH2cd,4dcc cDPCCHSDPDCH4cd,6dDPDCH6Figure 1: Spreading for uplink DPC
43、CH and DPDCHs After channelization, the real-valued spread signals are weighted by gain factors, cfor DPCCH, and dfor all DPDCHs. The cand dvalues are signalled by higher layers or calculated as described in TS 125 214 4. At every instant in time, at least one of the values cand dhas the amplitude 1
44、,0. The cand dvalues are quantized into 4 bit words. The quantization steps are given in table 1. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 9 Table 1: The quantization of the gain parameters Signalling values for cand dQuantized amplitude ratios cand d15 1,0 14 14/15 13 13/15 12 12/15 11 11/15 10 10/1
45、5 9 9/15 8 8/15 7 7/15 6 6/15 5 5/15 4 4/15 3 3/15 2 2/15 1 1/15 0 Switch off After the weighting, the stream of real-valued chips on the I- and Q-branches are then summed and treated as a complex-valued stream of chips. This complex-valued signal is then scrambled by the complex-valued scrambling c
46、odeSdpch,n. The scrambling code is applied aligned with the radio frames, i.e. the first scrambling chip corresponds to the beginning of a radio frame. 4.2.2 PRACH 4.2.2.1 PRACH preamble part The PRACH preamble part consists of a complex-valued code, described in clause 4.3.3. 4.2.2.2 PRACH message
47、part Figure 2 illustrates the principle of the spreading and scrambling of the PRACH message part, consisting of data and control parts. The binary control and data parts to be spread are represented by real-valued sequences, i.e. the binary value “0“ is mapped to the real value +1, while the binary
48、 value “1“ is mapped to the real value -1. The control part is spread to the chip rate by the channelization code cc, while the data part is spread to the chip rate by the channelization code cd. jccccddSr-msg,nI+jQPRACH messagecontrol partPRACH messagedata partQISFigure 2: Spreading of PRACH messag
49、e part After channelization, the real-valued spread signals are weighted by gain factors, cfor the control part and dfor the data part. At every instant in time, at least one of the values cand dhas the amplitude 1,0. The -values are quantized into 4 bit words. The quantization steps are given in clause 4.2.1. ETSI ETSI TS 101 851-3 V1.2.1 (2006-01) 10After the weighting, the stream of real-valued chips on the I- and Q-branches are treated as a complex-valued stream of chips. This complex-valued signal is then s
