ETSI TS 100 392-3-7-2003 Terrestrial Trunked Radio (TETRA) Voice plus Data (V+D) Part 3 Interworking at the Inter-System Interface (ISI) Sub-part 7 Speech Format Implementation for_1.pdf

1、 ETSI TS 100 392-3-7 V1.1.1 (2003-12)Technical Specification Terrestrial Trunked Radio (TETRA);Voice plus Data (V+D);Part 3: Interworking at the Inter-System Interface (ISI);Sub-part 7: Speech Format Implementation forPacket Mode TransmissionETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 2 Reference DTS/

2、TETRA-03107 Keywords interworking, TETRA, V+D, radio 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 n

3、otice Individual copies of the present document can be 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 Porta

4、ble Document Format (PDF). In case of dispute, the reference 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

5、 on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyrig

6、ht 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 bei

7、ng 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 100 392-3-7 V1.1.1 (2003-12) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 5 1 Scope 6 2 References

8、6 3 Definitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .7 4 Overview 7 5 Frame format and procedures.7 5.1 HDLC Frame Format .7 5.2 TETRA ISI payload9 5.2.1 General9 5.2.2 TCH_S (TETRA CODEC) .11 5.2.3 Payload examples.12 5.3 Physical layer .14 5.4 Mapping structure.14 5.5 TETRA ISI

9、Channel Mapping15 Annex A (informative): Bibliography.17 History 18 ETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 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 IPRs, if any, is

10、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 available on the

11、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 server) which a

12、re, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Project Terrestrial Trunked Radio (TETRA). The present document is part 3, sub-part 7 of a multi-part deliverable covering Voice plus Data (V+D), as identified below:

13、 EN 300 392-1: “General network design“; EN 300 392-2: “Air Interface (AI)“; EN 300 392-3: “Interworking at the Inter-System Interface (ISI)“; Sub-part 1: “General design“; Sub-part 2: “Additional Network Feature Individual Call (ANF-ISIIC)“; Sub-part 3: “Additional Network Feature Group Call (ANF-I

14、SIGC)“; Sub-part 4: “Additional Network Feature Short Data Service (ANF-ISISDS)“; Sub-part 5: “Additional Network Feature Mobility Management (ANF-ISIMM)“; Sub-part 6: “Additional Network Feature for Speech Format Implementation for Circuit Mode Transmission“ (TS); Sub-part 7: “Additional Network Fe

15、ature for Speech Format Implementation for Packet Mode Transmission“ (TS); ETS 300 392-4: “Gateways basic operation“; EN 300 392-5: “Peripheral Equipment Interface (PEI)“; EN 300 392-7: “Security“; EN 300 392-9: “General requirements for supplementary services“; EN 300 392-10: “Supplementary service

16、s stage 1“; EN 300 392-11: “Supplementary services stage 2“; EN 300 392-12: “Supplementary services stage 3“; ETS 300 392-13: “SDL model of the Air Interface (AI)“; ETS 300 392-14: “Protocol Implementation Conformance Statement (PICS) proforma specification“. TS 100 392-15: “TETRA frequency bands, d

17、uplex spacings and channel numbering“; TS 100 392-16: “Network Performance Metrics“; ETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 5 TS 100 392-17: “TETRA V+D and DMO Release 1.1 specifications“. Introduction There are two different speech format options defined for the TETRA InterSystem Interface (ISI)

18、 speech transmission one for circuit mode support and another for packet mode support. The two options allow different techniques in designing and interconnecting TETRA Switching and Management Infrastructure (SwMIs). Those based on circuit mode transmission technology can use the complementary circ

19、uit mode based option, and those based on packet mode transmission technology can take advantage of the present document of the ISI. The reason for having two options shall be found in the nature of existing TETRA SwMIs from various manufacturers. The existing SwMIs can generally be divided into two

20、 types: those that use packet switched technology and those that are using a circuit switched technology. When connecting a circuit switched SwMI to a packet switched SwMI there must be a conversion performed from one technology to the other. However, if connecting two circuit switched SwMIs or two

21、packet switched SwMIs, then a conversion is not necessary. When a circuit switched and a packet switched SwMI is connected, a TETRA ISI Transport Converter (ISI-TC) is required. The ISI-TC does not necessarily need to be provided by the SwMI manufactures. The location of the ISI-TC will be dependent

22、 on the backbone network that is used to interconnect the two systems. If a packet switched backbone is available, then the location of the ISI-TC is best in the circuit switched SwMI end. If a circuit switched backbone is available, then the location of the ISI-TC is best at the packet SwMI. ETSI E

23、TSI TS 100 392-3-7 V1.1.1 (2003-12) 6 1 Scope The present document specifies Speech Format Implementation for Packet Mode Transmission in TETRA ISI. The present document defines the format of user information that is transported between two SwMIs using the TETRA ISI and supporting packet mode speech

24、 transmission for ISI connections. It is complementary to the subpart of the ISI specification describing a circuit mode approach. The present document covers how TETRA traffic e.g. speech, circuit mode data is encapsulated in standard HDLC frames for transport over various media. For present docume

25、nt the media is a 2 Mbit/s E1 link (ITU-T Recommendations G.703 and G.704 (see bibliography). The E1 link is the primary transport layer between the network gateway elements in the two SwMIs that are interconnected via TETRA ISI. The present document does not cover: any signalling issues (e.g. how s

26、peech circuits are reserved on the ISI interface, how call set up is done). 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 n

27、umber or version number) 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/Referenc

28、e. 1 ETSI EN 300 392-2: “Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface (AI)“. 2 ETSI ETS 300 395-2: “Terrestrial Trunked Radio (TETRA); Speech codec for full-rate traffic channel; Part 2: TETRA codec“. 3 Definitions and abbreviations 3.1 Definitions For the purposes

29、 of the present document the following terms and definition applies: Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA services NOTE: By definition, a mobile station contains at least one Mobile Radio Stack (MRS). ETSI ETSI TS 100 392-3-7 V

30、1.1.1 (2003-12) 7 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ACELP Algebraic CELP ATM Asynchronous Transfer Mode BFI Bad Frame Indication DLCI Data Link Connection Identifier E1 European format for digital transmission FCS Frame Check Sequence FT F

31、rame Type FN Frame NumberHDLC High level Data Link Control ISDN Integrated Services Digital Network ISI Inter System Interface ISI-TC Inter System Interface Transport Converter MRS Mobile Radio Stack MS Mobile Station O OriginatorPVC Permanent Virtual Circuit PID Protocol IDentifier STCH STealing CH

32、annel SwMI Switching and Management Infrastructure TBN Traffic Block Number TCH Traffic Channel TETRA Terrestrial Trunked Radio V+D Voice plus Data 4 Overview In a packet based SwMI, TETRA traffic is carried in frames. When connecting two packet based SwMIs the most optimal way to handle the transpo

33、rt of user plane information (e.g. ACELP) between the SwMIs is via a frame capable connection. In the packet switched approach, TETRA traffic is carried inside standard HDLC frames. In ISI phase 1 one TETRA ISI call is carried per 64 kbit/s slot on the 2 Mbit/s E1 link, but the use of HDLC frames al

34、lows for adaptation of other transport medias such as e.g. ATM. Since the transmission defined in the present document is packet mode, packets may be subject to jitter. The maximum jitter is a SwMI specific characteristic. The value of the allowable maximum jitter value is outside the scope of the p

35、resent document. 5 Frame format and procedures 5.1 HDLC Frame Format HDLC framing is used to encapsulate the address, payload and checksum content with 7EHflags as presented in table 1. The bit number 8 is the most significant bit. The bit number 1 is the least significant bit and shall be sent firs

36、t (standard for HDLC protocol). NOTE: The bits of an octet are numbered from 1 to 8 in the present document. ETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 8 Table 1: HDLC Frame 8 7 6 5 4 3 2 1 Start Flag 7EHAddress 1 Upper DLCI C/R EA0 Address 2 Lower DLCI FECN BECN DE EA1 Payload TETRA Payload . FCS 1

37、FCS FCS 2 FCS Stop flag 7EHInformation elements in the table 1: Start Flag: 7EH; DLCI: Used to indicate the TETRA ISI Channel number; C/R (Command Response) = 1 = Command; EA0 = 0 = One more address byte follows; EA1 = 1 = Last address byte; FECN and BECN = 0 (default values); DE = 0 (default value)

38、; TETRA Payload: see clause 5.2; FCS: Frame Check Sequence; FCS1: most significant 8 bits of FCS; FCS2: least significant 8 bits of FCS; Stop Flag: 7EH. Cyclic redundancy check Cyclic redundancy check shall be calculated with generation polynomial: X16+ X12+ X5+ 1. Zero Bit Insertion Since 7EHis use

39、d as a packet delimiter it is vital that this pattern does not appear within the packet itself causing the receiver of the packet to falsely detect an end of packet condition. Zero bit insertion is therefore used by the sending device so that after every 5 consecutive “1“s an additional “0“ is inser

40、ted into the bit stream, i.e.: 0 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 0 becomes after zero insertion: 0 1 1 1 1 1 0 1 1 1 1 1 0 0 1 1 1 1 1 0 0 ETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 9 5.2 TETRA ISI payload 5.2.1 General The protocol has been designed to support TETRA CODEC packets (single/dual), circ

41、uit mode data and extended U-plane services. However, this version of the document only describes in detail the packet formats for TETRA CODEC packets (single and dual) and extended U-plane services. Nevertheless, this principle applies equally to the other remaining U-plane packet formats. Generic

42、payload structure is presented in figure 1. Payload Header Payload Block 1 Payload Block 2 Payload Block 3 Figure 1: TETRA payload structure The payload header is comprised of the following information elements, see figure 2: Protocol IDentifier (PID): this information element shall identify the typ

43、e of circuit mode speech/data service; Frame Type (FT): this information element shall identify the configuration of the payload; Originator (O): this information element shall identify whether the circuit mode speech/data originated from the SwMI or an MS; Frame Number (FN): this information elemen

44、t shall indicate the sequence of packets (and shall indicate where frame 18 occurs); and Traffic Block Number (TBN): this information element shall indicate the order of the traffic blocks when those are sent using separate payload messages but belong to the same frame number. Together these informa

45、tion elements determine the number of blocks (0, 1, 2 or 3) and the type of data within those blocks, which form the remaining part of the payload. Table 2: Payload header format Bit Number Octet 8 7 6 5 4 3 2 1 No. PID FT 1 O FN TBN 2 Table 3: PID values Values Description 0HReserved 1HTCH_S (TETRA

46、 CODEC) 2HReserved (TETRA2 CODEC) 3HReserved 4HReserved (TCH_D/7,2) 5HReserved (TCH_D/4,8) 6HReserved (TCH_D/2,4) 7HReserved etc. etc. FHReserved Depending on the value of PID, refer to table 3, the FT information element shall identify the exact format and number of the remaining blocks in the payl

47、oad. The FT values used in the present document for PID = “TCH_S“ are given in table 7. The use of the originator field allows the destination SwMI to determine the characteristics of the circuit mode speech/data packet stream, refer to table 4. Different buffering schemes may then be applied to opt

48、imise audio delay for ISI calls. ETSI ETSI TS 100 392-3-7 V1.1.1 (2003-12) 10Table 4: Originator (O) values Values Description 0HOriginating from an MS 1HOriginating from the SwMI The Frame Number (FN) information element should be used by the destination SwMI to monitor the sequence of packets and,

49、 when used in conjunction with the originator field, identify when the frame 18 gap will occur in the packet stream. The FN information element shall be as defined in table 5. When the payload message originates from an MS, the frame number in the payload header shall represent the frame number associated with the packet when base station received it over the air interface. When the payload message originates from the SwMI, the FN in the payload header shall be used as a sequence counter only. Table 5: FN values Values Description 0HFrame 1 1HFrame 2