1、ETSI TS 101 377-5-4 1.1.1 (2001-03) Technical Specification G EO-Mob le Radio Interface Specif cat ions; Part 5: Radio interface physical layer specifications; Sub-part 4: Modulation; GMR-2 05.004 GMR-2 05.004 2 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Tt- Reference DTS/SES-002-05004 Keywords GMR, MSS
2、, MES, satellite, GSO, S-PCN, GSM, interface, mobile, modulation, radio 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 enregistre la Sous-prfecture de Grasse (06) N
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6、ht and the foregoing restriction extend to reproduction in all media. 8 European Telecommunications Standards Institute 2001. All rights reserved. ETSI GMR-2 05.004 3 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Contents Intellectual Property Rights 4 Foreword 6 Introduction 7 1 Scope 8 2 References 8 3 A
7、bbreviations . 8 4 Modulation Format . 9 4.1 Modulating Bit Rate 9 4.2 Start and Stop of the Burst . 9 4.4 Filtering 11 4.5 Output Phase . 12 History . 14 4.3 Pre-Coding 10 4.6 Modulation 13 ETSI GMR-2 05.004 4 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Project TS 1 O1 377 V1.l.l TS 1 O1 377 V1.l.l TS 1
8、 O1 377 V1.l.l TS 1 O1 377 V1.l.l Intellectual Property Rights Company Title Country of Patent no Countries Origin Applicable Ericsson Mobile Improvements in, or in relation GB GB 2 215 567 GB Communication to, equalisers Ericsson Mobile Power Booster GB GB2251 768 GB Communication Ericsson Mobile R
9、eceiver Gain GB GB2233846 GB Communication Ericsson Mobile Transmitter Power Control for GB GB2233517 GB Communication Radio Telephone System 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 Prope
10、rty 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 -). The attention of ETSI has been drawn to the Intellectual Property Rights (IPRs) listed be
11、low 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 to these IPRs can be ob
12、tained 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 ETSI SR O00 314 (or th
13、e updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. IPRs: IPR Owner: Digital Voice Systems Inc One Van de Graaff Drive Burlington, MA 01803 USA Contact: John C. Hardwick Tel.: +1 781-270-1030 Fax: +1 781-270-0166 IPR Owner: Ericsson Mobile Commun
14、ications (E) Limited The Keytech Centre, Ashwood Way Basingstoke Hampshire RG23 8BG United Kingdom Contact: John Watson Tel.: +44 1256 864821 ETSI GMR-2 05.004 5 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Project TS 1 O1 377 V1.l.l Company Title Country of Patent no Countries Origin Applicable Hughes Ne
15、twork US Pending us Systems IPR Owner: Hughes Network Systems 11717 Exploration Lane Germantown, Maryland 20876 USA Global Telecommunic. Inc TS 1 O1 377 V1.l.l Lockheed Martin Global Contact: John T. Whelan Tel: +1 301-428-7172 Fax: +1 301-428-2802 Communications System with Call Interrupt Coding Sy
16、stem 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 Global Apparatus for Use in Facsimile Communication TS 1 O1 377 V1.l.l I Systems TS 1 O1 377 V1
17、.l.l ILockheed Martin ICellular Spacecraft TDMA Global communication System Telecommunic. Inc Lockheed Martin Spacecraft Cellular Global Communication System Global Telecommunic. Inc ITelecommunic. Inc TS 1 O1 377 V1.l.l ILockheed Martin Ispacecraft Cellular ITDMA Mobile Satellite System Communicati
18、on System with Spot Beam Pairing for Reduced Updates ITelecommunic. Inc I TS 1 O1 377 V1.l.l ILockheed Martin Ispacecraft Cellular Communication System with l?:mmunic. Inc IMutual Offset High-argin Iforward Control Signals TS 1 O1 377 V1.l.l ILockheed Martin Ispacecraft Cellular IPR Owner: Lockheed
19、Martin Global Telecommunications, Inc. 900 Forge Road Norristown, PA. 19403 USA ountry of Origin us us us us us us us Patent no JS 6,108,348 JS 5,717,686 JS 5,875,182 JS 5,974,314 JS 5,974,315 JS 6,072,985 JS 6,118,998 Countries Applicable us us us us us us Contact: R.F. Franciose Tel.: +1 610.354.2
20、535 Fax: +1 610.354.7244 ETSI GMR-2 05.004 6 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and Systems (SES). The contents of the present document are subject to continuing work within TC-SES a
21、nd 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 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 ed
22、itorial only changes have been incorporated in the specification; the second digit (m) is incremented for all other types of changes, i.e. technical enhancements, corrections, updates, etc. The present document is part 5, sub-part 4 of a multi-part deliverable covering the GEO-Mobile Radio Interface
23、 Specifications, as identified below: Part 1 : “General specifications“; Part 2: “Service specifications“; Part 3: “Network specifications“; Part 4: Part 5: “Radio interface protocol specifications“; “Radio interface physical layer specifications“; Sub-part 1: Sub-part 2: Sub-part 3: Sub-part 4: “Mo
24、dulation; GMR-2 05.004“; Sub-part 5: Sub-part 6: Sub-part 7: “Physical Layer on the Radio Path; GMR-2 05.001“; “Multiplexing and Multiple Access on the Radio Path; GMR-2 05.002“; “Channel Coding; GMR-2 05.003“; “Radio Transmission and Reception; GMR-2 05.005“; “Radio Subsystem Link Control; GMR-2 05
25、.008“; “Radio Subsystem Synchronization; GMR-2 05.010“; Part 6: “Speech coding specifications“. ETSI GMR-2 05.004 7 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) Introduction GMR stands for GE0 (Geostationary Earth Orbit) Mobile Radio interface, which is used for mobile satellite services (MSS) utilizing g
26、eostationary satellite(s). GMR is derived from the terrestrial digital cellular standard GSM and supports access to GSM core networks. Due to the differences between terrestrial and satellite channels, some modifications to the GSM standard are necessary. Some GSM specifications are directly applica
27、ble, whereas others are applicable with modifications. Similarly, some GSM specifications do not apply, while some GMR specifications have no corresponding GSM specification. Since GMR is derived from GSM, the organization of the GMR specifications closely follows that of GSM. The GMR numbers have b
28、een 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 = O) is used for GMR specifications that have a corresponding GSM specification. In this case, the numbers xx and yy correspond to the GSM number
29、ing 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 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 s
30、ystem is defined by the combination of a family of GMR specifications and GSM specifications as follows: If a GMR specification exists it takes precedence over the corresponding GSM specification (if any). This precedence rule applies to any references in the corresponding GSM specifications. NOTE:
31、Any references to GSM specifications within the GMR specifications are not subject to this precedence rule. For example, a GMR specification may contain specific references to the corresponding GSM specification. If a GMR specification does not exist, the corresponding GSM specification may or may n
32、ot apply. The applicability of the GSM specifications is defined in GMR-n 01.201. ETSI GMR-2 05.004 8 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) 1 Scope The modulator receives the bits ftom the encryption unit, (see GMR-2 05.001 2), and produces an RF signal. The filtering of the RF signal, necessary to
33、 obtain the spectral purity, is not defined, neither are the tolerances associated with the theoretical filter requirements specified. These are contained in GMR-2 05.005 4. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the pr
34、esent 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. u1 GMR-2 01.004 (ETSI TS 101 377-1-1): “
35、GEO-Mobile Radio Interface Specifications; Part 1: General specifications; Sub-part 1: Abbreviations and Acronyms; GMR-2 01.004“. GMR-2 05.001 (ETSI TS 101 377-5-1): “GEO-Mobile Radio Interface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 1: Physical Layer on the R
36、adio Path; 121 GMR-2 05.001“. 131 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: Multiplexing and Multiple Access on the Radio Path; GMR-2 05.002“. 141 GMR-2 05.005 (ETSI TS 101 377-5-5): “GEO-Mobile
37、Radio Interface Specifications; Part 5: Radio interface physical layer specifications; Sub-part 5: Radio Transmission and Reception; GMR-2 05.005“. 3 Abbreviations For the purposes of the present document, the abbreviations given in GMR-2 01.004 i apply. ETSI GMR-2 05.004 9 ETSI TS 1 O1 377-5-4 V1.l
38、.l (2001 -03) 4 Modulation Format a) RETURN Link (MES-to-Ground Station): the return link modulation format is constant-envelope GMSK with a BT of 0,3. b) FORWARD Link (Ground Station-to-MES): the forward link modulation format is linear, filtered OQPSK which is pre-coded such that it is compatible
39、with GMSK-type demodulator. c) Single Hop Link (MES-to-MES): transmit: MESS will transmit GMSK (BT = 0,3) signals with characteristics as described in the RETURN Link (MES-to-Ground Station) sections in the present document; receive: MES will receive both GMSK (BT = 0,3) signals and filtered OQPSK w
40、ith characteristics as described in the RETURN Link (MES-to-Ground Station) and FORWARD Link (Ground Station-to-MES) sections in the present document. Signals received from the connected MES (S-TCH, S-FACCH) will have GMSK (BT = 0,3) modulation format and signals received from a Ground Station (S-SA
41、CCH) will have filtered OQPSK modulation format. 4.1 Mod u lat i ng Bit Rat e a) RETURN Link (MES-to-Ground Station): the modulating bit rate is l/Treturn = 1 625/24 kbids (i.e. 67,70833 kbids). b) FORWARD Link (Ground Station-to-MES): the modulating bit rate is l/Tforward = 1 625/6 kbids (i.e. 270,
42、833 kbids). c) Single Hop Link (MES-to-MES): - the modulating bit rate of signals transmitted by a MES is 1/T return = 1 625/24 kbids (i.e. 67,7083 kbids); - the modulating bit rate of signals received by a MES is 1/T forward = 1 625/6 kbids (i.e. 270,833 kbids). 4.2 Start and Stop of the Burst a) R
43、ETURN Link (MES-to-Ground Station): before the first bit of the bursts as defined in GMR-2 05.002 3 enters the modulator, the modulator has an internal state as if a modulating bit stream consisting of consecutive ones (di = 1) had entered the differential encoder. Also after the last bit of the tim
44、e slot, the modulator has an internal state as if a modulating bit stream consisting of consecutive ones (di = 1) had continued to enter the differential encoder. These bits are called dummy bits and define the start and the stop of the active part of the burst as illustrated in figure 4.2.1. Nothin
45、g is specified about the actual phase of the modulator output signal outside the useful part of the burst. ETSI GMR-2 05.004 10 ETSI TS 1 O1 377-5-4 V1.l.l (2001 -03) b) FORWARD Link (Ground Station-to-MES): not applicable. c) Single Hop Link (MES-to-MES): the start and stop of bursts during single
46、hop connections is determined based on the modulation format of a burst. The start and stop of bursts with GMSK modulation format (received from the connecting MES) are as previously described for the RETURN Link, and the start and stop of bursts with filtered OQPSK modulation format (received from
47、a Ground Station) are as previously described for the FORWARD Link. dummy bits . 1 11 11 1 1/2 bit + j 3 tail bits 3 tail bits jooo O00 j j Output Phase j Useful Part d It +I 4; b j Active Part dummy bits 111111 112 bit NOTE: For the normal burst, the useful part lasts for 147 modulating bits. Figur
48、e 4.2.1 : Relation Between Active Part of Burst, Tail Bits and Dummy Bits 4.3 Pre-Cod ng a) RETURN Link (MES-to-Ground Station): each data value di = O, i is differentially encoded; the output of the differential encoder is: di = di O di.l (di E O, l), where O denotes modulo 2 addition. The modulati
49、ng data value ai input to the modulator is: ai = 1-2 di (aie. -1, +i). b) FORWARD Link (Ground Station-to-MES): data values di = 0,1 are not differentially encoded; the modulating data value ai input to the modulator is: ai = (1-2di) (-1)Lg2l (ai -1, +i), where XI represents the integer part of x. c) Single Hop Link (MES-to-MES): data bits are pre-coded to be consistent with the modulation format. Bits which will be GMSK modulated are pre-coded as previously described for the RETURN Link, and bits which will be OQPSK modulated are pre- coded as previou
