1、 TIA-102.BAAA-B (Revision of TIA-102.BAAA-A) June 2017Project 25 FDMA Common Air Interface ANSI/TIA-102.BAAA-B-2017 APPROVED: JUNE 19, 2017 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purc
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23、BAAA-B i Foreword (This foreword is not part of this document.) This document has been created in response to a request by the Project 25 Steering Committee as provided for in a Memorandum of Understanding (MOU) dated April 1992 and amended December 1993. The MOU states that the Project 25 Steering
24、Committee shall devise a Common System Standard for digital public safety communications (the Standard) commonly referred to as Project 25 or P25, and that TIA, as agreed to by the membership of the appropriate TIA Engineering Committee, will provide technical assistance in the development of docume
25、ntation for the Standard. If the abbreviation “P25” or the wording “Project 25” appears on the cover sheet of this document when published that indicates the Project 25 Steering Committee has adopted this document as part of the Standard. The appearance of the abbreviation “P25” or the wording “Proj
26、ect 25” on the cover sheet of this document or in the title of any document referenced herein should not be interpreted as limiting the applicability of the information contained in any document to “P25” or “Project 25” implementations exclusively. This document was developed by the TIA TR-8.15 Comm
27、on Air Interface Subcommittee and provides a specification of the FDMA Common Air Interface for TIA-102 Land Mobile Radio systems. This document describes the access method, modulation, data rate, and message formats necessary to ensure a common air interface. The 3rdedition (Revision B) of this doc
28、ument revised TIA-102.BAAA-A to address errata comments and align the content with current TR-8 practices. This document cancels and replaces TIA-102.BAAA-A. There is one annex in this document. Annex A is normative and is considered part of this specification. TIA does not evaluate, test, verify or
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30、tested; however, a great deal of time and good faith effort has been invested in the preparation of this document to ensure the accuracy of the information it contains. TIA-102.BAAA-B ii Patent Identification The readers attention is called to the possibility that compliance with this document may r
31、equire the use of one or more inventions covered by patent rights. By publication of this document, no position is taken with respect to the validity of those claims or any patent rights in connection therewith. The patent holders so far identified have, we believe, filed statements of willingness t
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33、IA shall not be responsible for identifying patents for which licenses may be required by this document or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. TIA-102.BAAA-B iii Table of Contents 1. Introduction . 1 1.1 Scope . 2 1.2 Referenc
34、es . 3 1.2.1 Normative References 3 1.2.2 Informative References 4 1.3 Acronyms and Abbreviations 4 1.4 Definitions . 4 1.5 Conventions . 5 1.5.1 Message Bit Numbering . 5 1.5.2 Block and Packet Formats 5 1.5.3 Symbols 5 2. Description 6 3. Voice Coder . 8 4. Voice Formats . 10 4.1 General Descripti
35、on 10 4.1.1 Notation 11 4.1.2 Reserved Bits and Null Bits 11 4.2 Header Word 12 4.3 Voice Frames . 13 4.3.1 Interleaving Schedule . 14 4.4 Encryption Sync Word 16 4.5 Link Control Word . 16 4.5.1 Terminator Link Control 17 4.6 Low Speed Data Word . 17 4.7 Golay Code Generator Matrices . 18 4.8 Hammi
36、ng Code Generator Matrices . 19 4.9 Reed-Solomon Code Generator Matrices 20 5. Data Packets . 23 5.1 General Description 23 5.2 Header Block Structure 24 5.3 Data Block Structure . 24 5.3.1 Unconfirmed Data Block Structure . 24 5.3.2 Confirmed Data Block Structure . 25 5.3.3 Packet CRC 25 5.4 Confir
37、med Data Packet Formats 25 5.4.1 Confirmed Data Packet Header Format . 25 5.4.2 Confirmed Data Packet Data Block Format 27 5.4.3 Confirmed Data Packet Last Data Block Format 28 5.5 Response Packet Format . 29 5.6 Unconfirmed Data Packet Header Format 31 5.7 Enhanced Addressing Format 33 TIA-102.BAAA
38、-B iv 6. Data Error Correction . 36 6.1 Finite State Machine . 37 6.2 Interleaver . 38 7. Channel Access 39 7.1 General Description 39 7.2 Data Units . 39 7.2.1 Header Data Unit 40 7.2.2 Superframe Data Units . 40 7.2.3 Terminator Data Units . 41 7.2.4 Packet Data Unit . 42 7.3 Frame Sync Word . 43
39、7.4 Status Symbols . 43 7.5 Network Identifier 43 7.5.1 Data Unit ID 44 7.5.2 NID Code 44 8. Modulation . 46 8.1 General Description 46 8.2 Symbols 46 8.3 Nyquist Raised Cosine Filter . 46 8.4 C4FM Modulator . 47 8.4.1 C4FM Deviation 47 8.5 CQPSK Modulator 47 8.6 QPSK Demodulator 49 Annex A Transmit
40、 Bit Order (Normative) . 50 A.1 Conventions 50 A.2 Header Data Unit 52 A.3 Logical Link Data Unit 1 58 A.4 Logical Link Data Unit 2 71 A.5 Simple Terminator Data Unit . 84 A.6 Terminator Data Unit with Link Control . 86 TIA-102.BAAA-B v List of Figures Figure 1 Example RF Subsystem Illustration 1 Fi
41、gure 2 RF Subsystem Reference Model Configuration 1 Figure 3 Example Talk-Around Illustration 2 Figure 4 Talk-Around Reference Configuration . 2 Figure 5 Common Air Interface in a Radio System . 2 Figure 6 Reference Model Diagram 6 Figure 7 Simple Transmitter Diagram . 7 Figure 8 u_0 and u_7 Composi
42、tion . 9 Figure 9 Voice Message Structure 10 Figure 10 Data Units for Voice Messages . 10 Figure 11 Diagram of Header Code Word Construction . 12 Figure 12 Diagram of Voice Code Word Construction 13 Figure 13 Diagram of Encryption Sync Code Word Construction . 16 Figure 14 Link Control Formats . 16
43、Figure 15 Diagram of Link Control Code Word Construction 17 Figure 16 Diagram of Terminator Link Control Code Word . 17 Figure 17 Decomposition of Data Message into Packets 23 Figure 18 Confirmed Data Packet Header Block 26 Figure 19 Confirmed Data Packet Data Block. 27 Figure 20 Confirmed Data Pack
44、et Last Data Block . 29 Figure 21 Response Packet Format . 29 Figure 22 Response Packet Data Block . 31 Figure 23 Unconfirmed Data Packet Header Format 32 Figure 24 Unconfirmed Data Packet Last Data Block . 32 Figure 25 Unconfirmed Enhanced Addressing Packet Header Format . 34 Figure 26 Confirmed En
45、hanced Addressing Packet Header Format 35 Figure 27 Rate Trellis Encoder Overview . 36 Figure 28 Trellis Encoder Block Diagram 37 Figure 29 Data Units for Voice and Data Messages . 40 Figure 30 Header Data Unit 40 Figure 31 Logical Link Data Unit 1 41 Figure 32 Logical Link Data Unit 2 41 Figure 33
46、Simple Terminator Data Unit . 42 Figure 34 Terminator Data Unit with Link Control . 42 Figure 35 Packet Data Unit . 42 Figure 36 C4FM Modulator . 47 Figure 37 CQPSK Modulator 47 Figure 38 QPSK Demodulator 49 TIA-102.BAAA-B vi List of Tables Table 1 Interleaving Schedule for Voice Word . 15 Table 2 G
47、enerator Matrix of (16,8,5) code . 18 Table 3 Golay Generator Matrices . 19 Table 4 Generator Matrices for Hamming Codes . 19 Table 5 Representative Examples . 20 Table 6 Elements in Octal and Exponential Form 20 Table 7 GLCGenerator Matrix for Shortened Reed-Solomon Codes 21 Table 8 GESGenerator Ma
48、trix for Shortened Reed-Solomon Codes 22 Table 9 PHDRGenerator Matrix for Shortened Reed-Solomon Codes 22 Table 10 Response Packet Class, Type, and Status Definitions . 30 Table 11 Trellis Code Word Sizes 36 Table 12 Trellis Encoder State Transition Tables. 37 Table 13 Constellation to Dibit Pair Ma
49、pping . 38 Table 14 Interleave Table 38 Table 15 Frame Sync Word Sequence 43 Table 16 Status Symbol Codes 43 Table 17 Network Identifier Information . 44 Table 18 Data Unit Identifier Values . 44 Table 19 NID Code Generator Matrix . 45 Table 20 Dibit Symbol Mapping to Modulation Phase or Deviation 46 Table 21 CQPSK I and Q Lookup Table 48 TIA-102.BAAA-B vii Revision History Version Date Description Interim Standard 03/23/1995 Initial release of Common Air Interfac
