1、ETSI TS 101 377-5-7 1.11 (2001-03) Technical Specification G EO-Mob le Radio Interface Specif cat ions; Part 5: Radio interface physical layer specifications; Sub-part 7: Radio Subsystem Synchronization; GMR-2 05.010 GMR-2 05.010 2 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) Tt- Reference DTS/S ES-002-05
2、01 O Keywords GMR, GSM, GSO, interface, MES, mobile, MSS, radio, satellite, S-PCN, sub, synchronization, system 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 00017 - NAF 742 C Association but non lucratif enreg
3、istre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: present document may be made available in more than one electronic version or in print. In any case of existing perceived difference in contents between such versions,
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6、ght and the foregoing restriction extend to reproduction in all media. 8 European Telecommunications Standards Institute 2001. All rights reserved. ETSI GMR-2 05.010 3 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) Contents Intellectual Property Rights 4 Foreword 6 Introduction 7 1 2 3 3.1 3.2 4 4.1 4.2 4.3
7、 4.4 5 5.1 5.2 6 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 8.10 Scope 8 References 8 Definitions and Abbreviations . 9 General Description of Synchronization System 12 System Channel Assignment 14 Definitions 9 Abbreviations 12 Overview 12 System Time Definition . 12 System
8、 Operations . 14 Timebase Counters . 16 Timing state 16 Counter relationship 16 Timing of Transmitted Signals 17 Gateway frequency accuracy . 19 Gateway synchronization . 19 Channel Offset, Forward Stagger Group and assignment messages . 19 Delay advance . 20 Fine Timing Advance (FTA) . 20 Delta Tim
9、ing Advance (DTA) and gateway encoding . 20 Timeslot lengths 20 MES Synchronization . 21 Adjustment of MES timebase 21 NCC/Gateway/Satellite Synchronization . 19 Frequency source and accuracy 21 Timing assessment error 21 MES to Gateway transmission timing 21 MES implementation of new DTA value 21 F
10、TA values to be used by MES 22 Temporary loss of signal 22 Intra-beam channel changes . 22 Receipt of a new FTA value 22 Ready to transmit 22 History . 23 ETSI GMR-2 05.010 4 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l Intellectual Property Rights
11、Origin Applicable Digital Voice US US 5,715,365 us Digital Voice us us 5,754,974 us Digital Voice US US 5,226,084 us Systems Inc Systems Inc The information pertaining to essential IPRs is publicly available for ETSI members and non-members, and can be found in ETSI SR O00 3 14: “Intellectual Proper
12、ty 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 (htll7:/wwW,etsi.org/il7r. The attention of ETSI has been drawn to the Intellectual Property R
13、ights (IPRs) listed below which are, or may be, or may become, Essential to the present document. The IPR owner has undertaken to grant irrevocable licences, on fair, reasonable and non-discriminatory terms and conditions under these IPRs pursuant to the ETSI IPR Policy. Further details pertaining t
14、o these IPRs can be obtained directly from the IPR owner. The present IPR information has been submitted to ETSI and 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
15、ETSI SR O00 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l IPRs: Systems inc Digital Voice US US 5,701,390 us Systems Inc Digital Voice US US 5,826,222 us Systems Inc Project TS 1 O1 377 V1.l.l
16、 Company Title Country of Patent no Countries Origin Applicable Ericsson Mobile Improvements in, or in relation GB GB 2 215 567 GB Communication to. eaualisers TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l IPR Owner: Digital Voice Systems Inc One Van de Graaff Drive Burlington, MA 01803 U
17、SA Ericsson Mobile Power Booster GB GB2251 768 GB Communication Ericsson Mobile Receiver Gain GB GB2233846 GB Communication Ericsson Mobile Transmitter Power Control for GB GB 2 233 51 7 GB Communication Radio Telephone System Contact: John C. Hardwick Tel.: +1781270 1030 Fax: +1781270 0166 IPR Owne
18、r: Ericsson Mobile Communications (E) Limited The Keytech Centre, Ashwood Way Basingstoke Hampshire RG23 8BG United Kingdom Contact: John Watson Tel.: +44 1256 864 821 ETSI GMR-2 05.010 5 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) Project TS 1 O1 377 V1.l.l Company Title Country of Patent no Countries O
19、rigin Applicable Hughes Network us Pending us Systems IPR Owner: Hughes Network Systems 11717 Exploration Lane Germantown, Maryland 20876 USA Project TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l Contact: John T. Whelan Tel: +1301428 7172 Fax: +1301428 2802 Company Title Lockheed Martin Global Apparatus for
20、 Use in Telecommunic. Inc Narrowband Data and 2.4-to-3 KBPS Rate Adaptation Facsimile Communication Systems Lockheed Martin Cellular Spacecraft TDMA Global Telecommunic. Inc TS 1 O1 377 V1.l.l Lockheed Martin Global ITelecommunic. Inc ITDMA Mobile Satellite System TS 1 O1 377 V1.l.l ILockheed Martin
21、 Ispacecraft Cellular Communications System with Call Interrupt Coding System for Maximizing Traffic ThroughputCellular Spacecraft TDMA Communications System with Call Interrupt Coding System for Maximizing Traffic Throughput Enhanced Access Burst for Random Access Channels in TS 1 O1 377 V1.l.l TS
22、1 O1 377 V1.l.l TS 1 O1 377 V1.l.l IPR Owner: Lockheed Martin Global Telecommunications, Inc. 900 Forge Road Norristown, PA. 19403 USA Global Communication System Telecommunic. Inc Lockheed Martin Spacecraft Cellular Global Communication System Telecommunic. Inc Lockheed Martin Spacecraft Cellular G
23、lobal Communication System with Telecommunic. Inc Mutual Offset High-argin Forward Control Signals Lockheed Martin Spacecraft Cellular Global Communication System with Telecommunic. Inc Spot Beam Pairing for Reduced Uodates 2ountry o1 Origin us us us us us us us Patent no US 6,108,348 US 5,717,686 U
24、S 5,875,182 US 5,974,314 US 5,974,315 US 6,072,985 US 6,118,998 Countries Applicable us us us us us us Contact: R.F. Franciose Tel.: +1610 354 2535 Fax: +1610 354 7244 ETSI GMR-2 05.010 6 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) Foreword This Technical Specification (TS) has been produced by ETSI Tech
25、nical Committee Satellite Earth Stations and Systems (SES). 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 modify the contents of the present document it will then be republished by ETSI with an identif
26、ying 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 second digit (m) is incremented for all other types of changes, i.e. technical enhanceme
27、nts, corrections, updates, etc. The present document is part 5, sub-part 7 of a multi-part deliverable covering the GEO-Mobile Radio Interface Specifications, as identified below: Part 1 : “General specifications“; Part 2: “Service specifications“; Part 3: “Network specifications“; Part 4: Part 5: “
28、Radio interface protocol specifications“; “Radio interface physical layer specifications“; Sub-part 1: Sub-part 2: Sub-part 3: Sub-part 4: “Modulation; GMR-2 05.004“; Sub-part 5: Sub-part 6: “Physical Layer on the Radio Path; GMR-2 05.001“; “Multiplexing and Multiple Access on the Radio Path; GMR-2
29、05.002“; “Channel Coding; GMR-2 05.003“; “Radio Transmission and Reception; GMR-2 05.005“; “Radio Subsystem Link Control; GMR-2 05.008“; Sub-part 7: “Radio Subsystem Synchronization; GMR-2 05.010“; Part 6: “Speech coding specifications“. ETSI GMR-2 05.010 7 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) Int
30、roductio n GMR stands for GE0 (Geostationary Earth Orbit) Mobile Radio interface, which is used for mobile satellite services (MSS) utilizing geostationary satellite(s). GMR is derived from the terrestrial digital cellular standard GSM and supports access to GSM core networks. Due to the differences
31、 between terrestrial and satellite channels, some modifications to the GSM standard are necessary. Some GSM specifications are directly applicable, whereas others are applicable with modifications. Similarly, some GSM specifications do not apply, while some GMR specifications have no corresponding G
32、SM specification. Since GMR is derived from GSM, the organization of the GMR specifications closely follows that of GSM. The GMR numbers have been designed to correspond to the GSM numbering system. All GMR specifications are allocated a unique GMR number as follows: GMR-n xx.zyy where: - xx.0yy (z
33、= O) is used for GMR specifications that have a corresponding GSM specification. In this case, the numbers xx and yy correspond to the GSM numbering scheme. - xx.2yy (z = 2) is used for GMR specifications that do not correspond to a GSM specification. In this case, only the number xx corresponds to
34、the GSM numbering scheme and the number yy is allocated by GMR. n denotes the first (n = 1) or second (n = 2) family of GMR specifications. - A GMR system is defined by the combination of a family of GMR specifications and GSM specifications as follows: If a GMR specification exists it takes precede
35、nce over the corresponding GSM specification (if any). This precedence rule applies to any references in the corresponding GSM specifications. NOTE: Any references to GSM specifications within the GMR specifications are not subject to this precedence rule. For example, a GMR specification may contai
36、n specific references to the corresponding GSM specification. If a GMR specification does not exist, the corresponding GSM specification may or may not apply. The applicability of the GSM specifications is defined in GMR-n 01.201. ETSI GMR-2 05.010 8 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) 1 Scope Th
37、e present document defines the requirements for synchronization on the GMR-2 radio subsystem. However, it does not define the synchronization algorithms to be used in the MES and Gateway. 2 References The following documents contain provisions which, through reference in this text, constitute provis
38、ions of the present documen t. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. 111 GMR-2 01.004 (ETSI TS
39、101 377-1-1): “GEO-Mobile Radio Interface Specifications; Part 1: General specifications; Sub-part 1: Abbreviations and Acronyms; GMR-2 01.004“. GMR-2 04.004 (ETSI TS 101 377-4-3): “GEO-Mobile Radio Interface Specifications; Part 4: Radio interface protocol specifications; Sub-part 3: Layer 1 Genera
40、l requirements; GMR 2 04.004“. 121 131 GMR-2 04.008 (ETSI TS 101 377-4-7): “GEO-Mobile Radio Interface Specifications; Part 4: Radio interface protocol specifications; Sub-part 7: Mobile radio interface Layer 3 Specifications; GMR-2 04.008“. GMR-2 05.001 (ETSI TS 101 377-5-1): “GEO-Mobile Radio Inte
41、rface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 1: Physical Layer on the Radio Path; 141 GMR-2 05.001“. 151 GMR-2 05.002 (ETSI TS 101 377-5-2): “GEO-Mobile Radio Interface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 2: Multipl
42、exing and Multiple Access on the Radio Path; GMR-2 05.002“. GMR-2 05.005 (ETSI TS 101 377-5-5): “GEO-Mobile Radio Interface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 5: Radio Transmission and Reception; GMR-2 05.005“. 161 171 GMR-2 05.008 (ETSI TS 101 377-5-6):
43、“GEO-Mobile Radio Interface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 6: Radio Subsystem Link Control; GMR-2 05.008“. ETSI GMR-2 05.010 9 ETSI TS 1 O1 377-5-7 V1.l.l (2001 -03) 3 3.1 Definitions and Abbreviations Def i n it ions For the purposes of the present d
44、ocument, the following terms and definitions apply: Coarse Timing Advance (CTA): is defined for each spotbeam. It is the least round-trip propagation time experienced anywhere in the spotbeam at any time of day, adjusted downward to the nearest integer number of Forward Bit Periods (FBP). CTA is exp
45、ressed in units of Forward Bit Periods. Fine Timing Advance (FTA): is defined to be the difference in round trip propagation delay between the satellite and a MES located at the CTA location in a spotbeam and the satellite and a MES located anywhere in a spotbeam. The MES will use the CTA when trans
46、mitting a random access and will receive the FTA in the assignment message which follows a random access. FTA is represented as an integer number of quarter return bit periods. Note that a forward bit period is the same as a quarter return bit period. True Timing Advance (TTA): is calculated by each
47、 MES and is equal to the sum of the CTA and ETA. TTA is equal to the round trip propagation delay between the satellite and a MES located anywhere in a spotbeam (assuming numerical resolution and round-off errors neglected). Delta Timing Advance (DTA): is a parameter calculated by the Gateway which
48、instructs the MES to advance or retard its transmissions to the Gateway. DTA is used to correct MES timing offsets caused by MES and satellite movement after a link has been established with a gateway. DTA is represented in units of quarter return bit periods (1 forward bit period) and can range fro
49、m +12 (advance by 12 quarter return bit periods) to -12 (retard by 12 quarter return bit periods). MES Timing Offset: difference between the delay of the received signal relative to the expected signal from a MES if there were no change in the path length between the MES and gateway since the last Delta Timing Advance was implemented. MES timing offset is determined by the gateway. For example, for a MES with a round trip propagation delay of P bits, but with a True Timing Advance (CTA + ETA) of T bits, the reported timing offset will be P-T quantized to t
