1、 ETSI TS 100 912 V8.12.0 (2003-08)Technical Specification Digital cellular telecommunications system (Phase 2+);Radio subsystem synchronization(3GPP TS 05.10 version 8.12.0 Release 1999)GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 100 912 V8.12.0 (2003-08) 1 3GPP TS 05.10 version 8.12.0 Rele
2、ase 1999 Reference RTS/TSGG-010510v8c0 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 no
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6、t and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2003. 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 Marks currently bein
7、g 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 100 912 V8.12.0 (2003-08) 2 3GPP TS 05.10 version 8.12.0 Release 1999 Intellectual Property Rights IPRs essential or pot
8、entially 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 can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essentia
9、l, 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 (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
10、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 server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership P
11、roject (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. The cross reference between GSM, UMTS, 3GPP and ETSI identities
12、 can be found under http:/webapp.etsi.org/key/queryform.asp . ETSI ETSI TS 100 912 V8.12.0 (2003-08) 3 3GPP TS 05.10 version 8.12.0 Release 1999 Contents Intellectual Property Rights2 Foreword.2 Foreword.5 1 Scope 6 1.1 References 6 1.2 Definitions and abbreviations.6 2 General description of synchr
13、onization system7 3 Timebase counters8 3.1 Timing state of the signals8 3.2 Relationship between counters .8 4 Timing of transmitted signals.9 5 BTS Requirements for Synchronization.9 5.1 Frequency source9 5.2 Timebase counters10 5.3 Internal BTS carrier timing 10 5.4 Initial Timing advance estimati
14、on10 5.5 Maximum timing advance value 10 5.6 Delay tracking 10 5.6.1 For circuit switched channels10 5.6.2 For packet switched channels .10 5.6.3 Delay assessment error .11 5.6.4 Pico-BTS delay tracking.11 5.7 Timeslot length.11 5.8 Range of Timing advance.11 6 MS Requirements for Synchronization 11
15、 6.1 MS carrier frequency11 6.2 Internal timebase 12 6.3 Assessment of BTS timing .12 6.4 Timing of transmission.12 6.5 Application of Timing Advance.12 6.5.1 For circuit switched channels12 6.5.2 For packet switched channels .12 6.6 Access to a new BTS13 6.7 Temporary loss of signal 14 6.8 Timing o
16、f channel change 14 6.9 Application of new Timing Advance value14 6.10 Definition of “ready to transmit within x ms“ 14 6.11 Definition of additional reaction times for GPRS mobile stations .15 6.11.1 Uplink and downlink assignment reaction times 15 6.11.2 Change in channel coding scheme commanded b
17、y network.15 6.11.3 Contention resolution reaction time15 6.11.4 Reaction time in response to other commanding messages 15 6.12 Observed Frequency Offset (OFO) reported by the CTS-MS15 6.13 Timing of intersystem channel change from GSM to UTRAN15 6.14 Timing of combined intracell channel change and
18、packet assignment.16 7 CTS-FP Requirements for Synchronization.16 7.1 Frequency source default requirements16 7.2 Frequency source for a CTS-FP assisted by a CTS-MS.16 7.3 Internal CTS-FP carrier timing.16 7.4 Timeslot length.17 7.5 Assessment of CTS-MS delay17 ETSI ETSI TS 100 912 V8.12.0 (2003-08)
19、 4 3GPP TS 05.10 version 8.12.0 Release 1999 Annex A (normative): Additional requirements for pseudo-synchronization, synchronized handovers and pseudo-synchronized handovers.18 A.1 General descriptions and definitions 18 A.1.1 Conventions18 A.1.2 Definitions18 A.1.3 Details of operations.18 A.2 BTS
20、 requirements.19 A.2.1 The pseudo-synchronization scheme19 A.2.1.1 BTS a time difference estimate.19 A.2.1.2 The reception epoch criterion .19 A.2.1.3 Pseudo-synchronized handover 19 A.2.2 The synchronization scheme 19 A.3 MS requirements 20 A.3.1 Provision of time difference information .20 A.3.2 A
21、fter each successful handover20 A.3.3 Synchronized or a pseudo synchronized handover.20 Annex B (informative): CTSBCH timeslot shifting properties for CTS-MS synchronization21 B.1 Determination of TN by the CTS-MS when CTSBCH shifting is not active 21 B.2 Determination of TN by the CTS-MS when CTSBC
22、H shifting is active 21 Annex C (informative): BTS frequency source stability and E-OTD LMU reporting periods for LCS .22 C.1 BTS frequency source stability and E-OTD LMU reporting periods .22 C.2 Frequency source stability22 C.3 Relationship to E-OTD reporting periods 22 Annex D (informative): Chan
23、ge history .24 History 26 ETSI ETSI TS 100 912 V8.12.0 (2003-08) 5 3GPP TS 05.10 version 8.12.0 Release 1999 Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and
24、 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
25、; 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
26、rated in the document. ETSI ETSI TS 100 912 V8.12.0 (2003-08) 6 3GPP TS 05.10 version 8.12.0 Release 1999 1 Scope The present document defines the requirements for synchronization on the radio sub-system of the digital cellular telecommunications systems GSM. However, it does not define the synchron
27、ization algorithms to be used in the Base Transceiver Station (BTS), CTS Fixed Part (CTS-FP) and Mobile Station (MS). These are up to the manufacturer to specify. 1.1 References The following documents contain provisions which, through reference in this text, constitute provisions of the present doc
28、ument. 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-specific reference, the latest version applies. In the case of a reference to a 3GPP document (inclu
29、ding 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 01.04: “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. 2 3GPP TS 03.60: “Digital cellular telecommunicat
30、ions system (Phase 2+); General Packet Radio Service (GPRS); Service Description Stage 2“. 3 3GPP TS 03.64: “Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); GPRS Radio Interface Stage 2“. 4 3GPP TS 04.08: “Digital cellular telecommunications system (Phase
31、2+); Mobile radio interface layer 3 specification“. 5 3GPP TS 04.60: “Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Mobile Station (MS) - Base Station System (BSS interface; Radio Link Control (RLC) and Medium Access Control (MAC) Layer Specification“. 6
32、 3GPP TS 05.02: “Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access on the radio path“. 7 3GPP TS 05.05: “Digital cellular telecommunications system (Phase 2+); Radio transmission and reception“. 8 3GPP TS 05.08: “Digital cellular telecommunications system (Phase
33、 2+); Radio subsystem link control“. 9 3GPP TS 03.30: “Digital cellular telecommunications system (Phase 2+); Radio network planning aspects“. 10 3GPP TS 03.52: “Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS), Phase 1; Lower layers of the CTS Radio Interfa
34、ce; Stage 2“. 11 3GPP TS 05.56: “Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS), Phase 1; CTS-FP Radio subsystem“. 1.2 Definitions and abbreviations In addition to those below, abbreviations used in the present document are listed in 3GPP TR 01.04. For the
35、 purposes of the present document, the following terms and definitions apply: ETSI ETSI TS 100 912 V8.12.0 (2003-08) 7 3GPP TS 05.10 version 8.12.0 Release 1999 BTS: Base Transceiver Station. CTS-FP: CTS Fixed Part. CTS-MS: MS operating in CTS mode. Timing Advance: signal sent by the BTS to the MS w
36、hich the MS uses to advance its timings of transmissions to the BTS so as to compensate for propagation delay. Quarter symbol number: timing of quarter symbol periods (12/13 s) within a timeslot. Symbol period can be 1 or 3 bit periods depending upon modulation. Timeslot number: timing of timeslots
37、within a TDMA frame. TDMA frame number: count of TDMA frames relative to an arbitrary start point. Current Serving BTS: BTS on one of whose channels (TCH, DCCH, CCCH or PDCH) the MS is currently operating. Current Serving CTS-FP: CTS-FP on one of whose channels (TCH or CTS control channels) the CTS-
38、MS is currently operating. Timebase counters: set of counters which determine the timing state of signals transmitted by a BTS or MS. MS timing offset: delay of the received signal relative to the expected signal from an MS at zero distance under static channel conditions with zero timing advance. T
39、his is accurate to 1 symbol, and reported once per SACCH or after a RACH as. required (i.e. at the same rate as timing advance). For example, for an MS with a round trip propagation delay of P symbols, but with a timing advance of T symbols, the reported timing offset will be P-T quantized to the ne
40、arest symbol. For GPRS the MS timing offset is not reported. Timing Advance Index: Timing Advance Index TAI used for GPRS, which determines the position of the subchannel on PTCCH (see 3GPP TS 05.02) used by the MS to send an access burst, from which the network can derive the timing advance. Observ
41、ed Frequency Offset (OFO): difference of frequency of signals received by a CTS-MS from a CTS-FP and a BTS. The Observed Frequency Offset is measured and reported by the CTS-MS on CTS-FP requirement. The Observed Frequency Offset is expressed in ppm with an accuracy of 1/64 ppm (i.e. about 0,016 ppm
42、). Time group (TG): used for compact, time groups shall be numbered from 0 to 3 and a particular time group shall be referred to by its time group number (TG) (see 3GPP TS 05.02). 2 General description of synchronization system This clause gives a general description of the synchronization system. D
43、etailed requirements are given in clauses 3 to 7. The BTS sends signals on the BCCH or, for COMPACT on the CPBCCH, to enable the MS to synchronize itself to the BTS and if necessary correct its frequency standard to be in line with that of the BTS. The signals sent by the BTS for these purposes are:
44、 a) Frequency correction bursts; b) Synchronization bursts. The timings of timeslots, TDMA frames, TCH frames, control channel frames, and (for COMPACT) the rotation of time groups are all related to a common set of counters which run continuously whether the MS and BTS are transmitting or not. Thus
45、, once the MS has determined the correct setting of these counters, all its processes are synchronized to the current serving BTS. The MS times its transmissions to the BTS in line with those received from the BTS. The BTS sends to each MS a “timing advance“ parameter (TA) according to the perceived
46、 round trip propagation delay BTS-MS-BTS. The MS advances its timing by this amount, with the result that signals from different MSs arriving at the BTS and compensated for propagation delay. This process is called “adaptive frame alignment“. Additionally, synchronization functions may be implemente
47、d in both the MS and the BTS to support the so-called pseudo synchronization scheme. The support of this scheme is optional except that MS shall measure and report the ETSI ETSI TS 100 912 V8.12.0 (2003-08) 8 3GPP TS 05.10 version 8.12.0 Release 1999 Observed Timing Difference (OTD), which is a mand
48、atory requirement. The detailed specifications of the pseudo-synchronization scheme are included in annex A. While in dual transfer mode a class A MS performs all the tasks of dedicated mode. In addition, upper layers can require the release of all the packet resources, which triggers the transition
49、 to dedicated mode and the release of the RR resources, which triggers the transition to idle mode and packet idle mode. When handed over to a new cell, the MS leaves the dual transfer mode, enters the dedicated mode where it switches to the new cell, may read the system information messages sent on the SACCH and may then enter dual transfer mode in the new cell (see 03.64 3). In CTS, the CTS-FP sends signals on the CTSBCH to enable the MS to synchronize itself to the CTS-FP and if necessary correct its frequency standard to be in line with tha
