ETSI TS 144 035-2017 Digital cellular telecommunications system (Phase 2+) (GSM) GSM EDGE Location Services (LCS) Broadcast network assistance for Enhanced Observed Time Difference.pdf

1、 ETSI TS 144 035 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); GSM/EDGE Location Services (LCS); Broadcast network assistance for Enhanced Observed Time Difference (E-OTD) and Global Positioning System (GPS) positioning methods (3GPP TS 44.035 version 14.0.0 Release

2、14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 144 035 V14.0.0 (2017-04)13GPP TS 44.035 version 14.0.0 Release 14Reference RTS/TSGR-0644035ve00 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

3、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 The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in

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7、ctronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Te

8、lecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GS

9、M and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 144 035 V14.0.0 (2017-04)23GPP TS 44.035 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information

10、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 Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Se

11、cretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). 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 update

12、s 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 Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP ide

13、ntities, 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 can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present docum

14、ent “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except w

15、hen used in direct citation. ETSI ETSI TS 144 035 V14.0.0 (2017-04)33GPP TS 44.035 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviat

16、ions . 6g34 Broadcast Message Contents 6g34.1 E-OTD Assistance Data Broadcast Message 6g34.1.1 E-OTD Assistance Data Broadcast Message Content. 7g34.1.1.1 Message Structure Definition IE . 8g34.1.1.2 Reference Time IE 11g34.1.1.3 Ciphering Serial Number IE 11g34.1.1.4 Time Slot Scheme IE 11g34.1.1.5

17、 Neighbour Bitmap Definition IE . 12g34.1.1.6 Sectored Channels Definition IE . 12g34.1.1.7 Sectored Channels BTS ID Definition IE . 12g34.1.1.8 Sectored BTS Sync/Async Definition IE 13g34.1.1.9 Multiframe Offset Values IE . 13g34.1.1.10 BCC Definition IE 13g34.1.1.11 RTD Drift Factor Values IE 14g3

18、4.1.1.12 Channel RTD Values IE 15g34.1.1.13 Serving Cell Location IE . 16g34.1.1.14 Relative Neighbour Location IE . 16g34.2 GPS Assistance Data Broadcast Message 18g34.2.1 GPS Assistance Data Content . 18g34.2.1.1 DGPS Correction Data 19g34.2.1.1.1 GSM Time Present IE . 20g34.2.1.1.2 BTS Clock Drif

19、t Present IE . 20g34.2.1.1.3 BTS Clock Drift IE 20g34.2.1.1.4 Reference Location IE . 20g34.2.1.1.5 Reference Time IE . 20g34.2.1.1.6 Status/Health IE. 21g34.2.1.1.7 N_SAT IE 21g34.2.1.1.8 DGPS Corrections IE 21g34.2.1.2 Ephemeris and Clock Correction Data 22g34.2.1.3 Almanac and Other Data . 24g3An

20、nex A (informative): Overview of Broadcast Assistance for E-OTD and GPS 26g3A.1 General . 26g3A.2 E-OTD Assistance Broadcast . 26g3A.3 GPS Assistance Broadcast 26g3A.4 Impact on Other Services . 27g3Annex B (informative): Example of E-OTD Assistance Data Broadcast Message . 29g3Annex C (informative)

21、: Example of GPS Assistance Data Broadcast Message 34g3Annex D (informative): Change History 35g3History 36g3ETSI ETSI TS 144 035 V14.0.0 (2017-04)43GPP TS 44.035 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The co

22、ntents of the present document are subject to continuing work within the TSG and 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 fol

23、lows: Version x.y.z where: x the first 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. technical enhancements, corrections, updates, etc

24、. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 144 035 V14.0.0 (2017-04)53GPP TS 44.035 version 14.0.0 Release 141 Scope The present document contains the content of messages necessary for support of MS Based location service opera

25、tion on the mobile radio interface layer 3. 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, edition number, version number, etc.) or non-sp

26、ecific. 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 Relea

27、se as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 Void. 3 Void. 4 Void. 5 Void“ 6 3GPP TS 23.041: “Technical realization of Cell Broadcast Service (CBS)“. 7 Void. 8 Void. 9 Void. 10 Void. 11 Void. 12 Void. 13 Void. 14 Void. 15 RTCM-SC104: “RTCM Recommended Standar

28、ds for Differential GNSS Service (v.2.2)“. 16 ICD-GPS-200: “Navstar GPS Space Segment / Navigation User Interfaces“. ETSI ETSI TS 144 035 V14.0.0 (2017-04)63GPP TS 44.035 version 14.0.0 Release 143 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following

29、terms and definitions apply: E-OTD Assistance Data Message: contains the RTD and BTS coordinates of the neighbours that should be used in E-OTD measurements. This E-OTD Assistance Data is broadcasted using CBCH channel using SMSCB DRX service. The reception of this broadcast message enables MS to ca

30、lculate its own location. GPS Assistance Data Message: contains GPS differential corrections. The reception of this broadcast message enables MS to have calculate more accurate location estimate. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 ap

31、ply. 4 Broadcast Message Contents This clause describes the LCS Assistance Data messages to be broadcasted in SMSCB messages content part over CBCH channel using SMSCB DRX service. The rules and contets are described so that SMLC is able to construct the message as well as MS is able to process the

32、received message. The E-OTD Assistance Data message contains RTD and BTS coordinate information and GPS Assistance Data contains GPS Differential Correction data, Emphemeris and Clock Correction Data and Almanac and Other Data. 4.1 E-OTD Assistance Data Broadcast Message The E-OTD Assistance Data me

33、ssage contents are defined in this clause. The E-OTD Assistance Data message is built so that it has always a fixed length and some of the information elements are scalable according to the amount of neighbours and the amount of sectored channels. The information elements are in the order which is d

34、escribed in subclause 4.1.1 and no spare bits are allowed between elements. The MSB bits of the information elements are presented always first and if boundary of the octet divides the information element then the LSB part of the information element continues in the LSB part of the next octet (figur

35、e 1). Example of E-OTD Assistance Data Broadcast Message is in annex B. The channel to broadcast the E-OTD Assistance Data message is CBCH over which the SMSCB DRX service is used. One SMSCB message has fixed information data length of 82 octets and the purpose is always to use the whole fixed lengt

36、h message capacity for the message. MS can identify the LCS SMSCB message with E-OTD Message Identifier declared in 3GPP TS 23.041. ETSI ETSI TS 144 035 V14.0.0 (2017-04)73GPP TS 44.035 version 14.0.0 Release 14MSB LSBInformation Element Containing 26 bitsOctet nOctet n+1Octet n+2Broadcast Message7

37、6 5 4 3 2 1 0Octet n+3Octet n+47 6 5 4 3 2 1 07 6 5 4 3 2 1 01 0MSB Next IENext IE LSB .Octet n+57 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 1 0Figure 1: Information element bit mapping to the broadcast message 4.1.1 E-OTD Assistance Data Broadcast Message Content The Broadcast Assistance Data i

38、s a point-to-multipoint message from the GSM Network to the MSs. This message gives assistance data to the MS for performing E-OTD measurements and calculating its own position. It contains the following information elements. The information elements are always in the order described in table 1. The

39、 ciphered part of message is end of message and indicated with grey shading in table 1. Table 1: E-OTD Assistance Data Broadcast Message Content Information element Type/Reference Presence Message Structure Definition Message Structure Definition 4.1.1.1 M Reference Time Reference Time 4.1.1.2 M Cip

40、hering Serial Number Ciphering Serial Number 4.1.1.3 C Time Slot Scheme Time Slot Scheme 4.1.1.4 M Neighbour Bitmap Definition Neighbour BitmapDefinition 4.1.1.5 C Sectored Channels Definition Sectored Channels Definition 4.1.1.6 C Sectored Channels BTS ID Definition Sectored Channels BTS ID Definit

41、ion 4.1.1.7 C Sectored BTS Sync/Async Definition Sectored BTS Sync/Async Definition 4.1.1.8 C 51 Multiframe Offset Values 51 Multiframe Offset Values 4.1.1.9 M BCC Definition BCC Definition 4.1.1.10 M RTD Drift Factor Values RTD Drift Factor Values 4.1.1.11 C Channel RTD Values Channel RTD Values 4.

42、1.1.12 C Serving Cell Location Serving Cell Location 4.1.1.13 M Relative Neighbour Location Values Relative Neighbour Location Values 4.1.1.14 M ETSI ETSI TS 144 035 V14.0.0 (2017-04)83GPP TS 44.035 version 14.0.0 Release 144.1.1.1 Message Structure Definition IE This IE contains the definition of t

43、his broadcast message. The length of this IE is 19 bits and it is mandatory. This IE contains the following bits. Table 2: Message Structure Definition Bit Bit order in field Definition 1 LSB MSB Neighbour List Map (bits 2-0) 2 3 4 LSB MSB Accuracy Range (bits 2-0) 5 6 7 Ciphering Key Flag 8 Cipher

44、On/Off9 Sector Ind 10 RTD Range 11 LSB MSB RTD Accuracy (bits 1-0) 12 13 RTD Drift Factors Present 14 RTDs Present 15 LSB MSB Number of Neighbours (bits 4-0) 16 17 18 19 The first three octets upto bit 3 in octet 3 in the broadcast messages content part containing the Message Structure Definition IE

45、 look always as follows. 8 7 6 5 4 3 2 1 Cipher On/Off Cipher-ing Key Flag Accuracy Range (bits 2-0) Neighbour List Map (bits 2-0) Octet1 Number of Neighbours (bits 4-3) RTDs Present RTD Drift Factors Present RTD Accuracy (bits 1-0) RTD Range Sector Ind Octet2 (Next IE) Number of Neighbours (bits 2-

46、0) Octet3 The definitions of each structure item is declared below: Neighbour List Map These bits define in which order the neighbours in the System Information Neighbour List (max 32 neighbours) are reported with the broadcast message. - The Neighbour List Map will also affect the amount of bits th

47、at can be used for Relative Neighbour Location Value definitions. - This Broadcast Assistance Data message is always referring to the neighbour BTSs included in the System Information Neighbour List which is received in idle state from BCCH. The E-OTD broadcast message does not allow the possibility

48、 for delivering assistance data for other BTSs (outside the the System Information Neighbour List. ETSI ETSI TS 144 035 V14.0.0 (2017-04)93GPP TS 44.035 version 14.0.0 Release 14Table 3: Neighbour List Map 2 1 0 Definition 0 0 0 All Neigbours from neighbour list 0 0 1 Even Neighbours from neighbour

49、list 0 1 0 Odd Neighbours from neighbour list 0 1 1 1stand the MS uses this to correct the pseudorange it measures at t1 using ephemeris IODE-2, PRm(t1, IODE-2), by: PR(t1, IODE2) = PRm(t1, IODE2) + PRC(t1, IODE2). If there is not an ephemeris set for a currently visible satellite that is two issues old, then the parameters Delta PRC2 and Delta RRC2 are both set to zero. 4.2.1.2 Ephemeris and Clock Correction Data This subclause descr