1、 TIA-102.BBAC December 2010 Project 25 Phase 2 Two- Slot TDMA Media Access Control Layer Description NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability
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22、IONS. TIA-102.BBAC iiiTABLE OF CONTENTS 1 INTRODUCTION . 1 1.1 OVERVIEW OF THE STANDARD 1 1.2 DOCUMENT ORGANIZATION 1 2 SCOPE 3 2.1 SCOPE OF THE STANDARD . 3 2.2 REFERENCES . 4 2.2.1 Normative References 4 2.2.2 Informative References 5 2.3 GLOSSARY 5 2.3.1 Acronyms . 5 2.3.2 Definitions . 6 2.3.3 C
23、onventions . 8 3 TDMA TRUNKED VOICE CHANNEL DESCRIPTION AND STRUCTURE 10 3.1 INTRODUCTION . 10 3.2 MAC LAYER CHANNEL STRUCTURE 10 3.2.1 Generic Two-Slot Superframe Structure - Time Slot Numbering and TDMA Channel Numbering . 10 3.2.2 Ultraframe . 11 3.3 LOGICAL CHANNEL DESCRIPTIONS ON A VOICE CHANNE
24、L . 12 3.3.1 VTCH (Voice Transport CHannel) 14 3.3.2 SACCH (Slow Associated Control CHannel) 14 3.3.3 FACCH (Fast Associated Control CHannel) 15 3.3.4 ISCH (Inter-slot Signaling CHannel) 15 3.4 TIMING ALIGNMENT BETWEEN CCH AND VCH . 17 3.4.1 TDMA Channel Alignment 17 3.4.2 Synchronization Method Whe
25、n the CCH is a FDMA CCH . 17 4 BURST DESCRIPTION . 20 4.1 GENERAL DESCRIPTION 20 4.2 BURSTS CONTAINING VOICE FRAMES . 22 4.3 BURSTS CONTAINING SIGNALING (DATA, CONTROL) . 26 5 BURST FIELD DEFINITIONS 29 5.1 SYNCHRONIZATION SEQUENCES . 29 5.2 PILOT SEQUENCE 30 5.3 VOICE FIELDS . 31 5.4 DATA UNIT ID (
26、DUID) . 31 5.4.1 DUID Encoding . 32 5.4.2 Decoding Schemes . 33 5.5 INFORMATION IN ISCH . 33 5.6 ENCODED MAC INFORMATION AND ENCRYPTION SYNCHRONIZATION SIGNAL . 35 5.6.1 Encoded MAC Information (EMI) . 37 5.6.1.1 Inbound Encoded MAC Information (IEMI) 37 5.6.1.2 Outbound Encoded MAC Information with
27、 Sync (S-OEMI) 38 5.6.1.3 Outbound Encoded MAC Information (I-OEMI) . 38 5.6.2 Encryption Synchronization Signal (ESS) . 39 5.6.2.1 ESS Decoding . 39 5.7 RAMP 40 6 BEARER SERVICE DESCRIPTION . 41 TIA-102.BBAC iv 6.1 VOICE BURST SEQUENCING (BASIC VOICE SERVICE) . 41 6.2 DUID MANAGEMENT . 42 7 MAC PRO
28、TOCOL DESCRIPTION . 43 7.1 OVERVIEW OF PROTOCOL . 43 7.2 GENERIC MAC PROCEDURES . 43 7.2.1 Signaling on Unassigned Channel 43 7.2.2 Signaling on an Assigned VCH . 44 7.2.2.1 Use of the Inbound SACCH on an Assigned Channel 45 7.2.2.2 Use of the Outbound SACCH on an Assigned Channel .45 7.2.3 Alternat
29、e Activity Signaling 46 7.2.4 Synchronization Procedures . 47 7.2.4.1 Symbol Synchronization .47 7.2.4.2 Synchronization to the VCH .47 7.2.4.3 FDMA CCH and TDMA VCH Synchronization Procedures.50 7.2.5 Scrambling 51 7.2.6 Power Control 56 7.2.6.1 Introduction 56 7.2.6.2 Open Loop Power Control on In
30、bound VCH 56 7.2.6.3 Closed Loop Power Control on Inbound VCH .57 7.3 VOICE CHANNEL PROCEDURES 58 7.3.1 Assigned VCH Initial Access Procedures (Call Setup) . 58 7.3.2 Assigned VCH Maintenance Procedures (Traffic Mode) . 60 7.3.3 Assigned VCH Termination (Call Teardown) . 61 7.3.3.1 Transmission Trun
31、ked Termination .62 7.3.3.2 Message Trunked Termination .62 7.3.4 Assigned VCH Message Trunking Call Continuation Procedures (Hangtime continuation) 63 7.3.4.1 Call Continuation on CCH 63 7.3.4.2 Call Continuation on VCH64 7.3.5 Assigned VCH Preemption . 65 7.3.5.1 VCH Audio Preemption 66 7.3.5.2 VC
32、H Call Preemption .71 8 MAC PDUS 77 8.1 MAC PDUS GENERAL DESCRIPTION . 77 8.1.1 Outbound MAC PDU 77 8.1.2 Inbound MAC PDU 79 8.2 EXHAUSTIVE DESCRIPTION OF MAC PDUS . 80 8.2.1 MAC_PTT PDU 80 8.2.2 MAC_END_PTT PDU 83 8.2.3 MAC_IDLE, MAC_ACTIVE, and MAC_HANGTIME PDU Formats 86 8.3 MAC MESSAGE DETAILS .
33、 89 8.3.1.1 Null Information Message 91 8.3.1.2 Group Voice Channel User Message .91 8.3.1.3 Unit to Unit Voice Channel User Message 92 8.3.1.4 Telephone Interconnect Voice Channel User Message 93 8.3.1.5 Unit to Unit Voice Request .94 8.3.1.6 Group Voice Channel Grant Update Multiple .94 8.3.1.7 Gr
34、oup Voice Channel Grant .96 8.3.1.8 Group Voice Channel Grant Update 97 8.3.1.9 Group Voice Channel Grant Update Explicit .97 8.3.1.10 Unit to Unit Voice Channel Grant 98 8.3.1.11 Unit to Unit Answer Request 99 8.3.1.12 Radio Unit Monitor Enhanced Command 100 8.3.1.13 Telephone Interconnect Answer R
35、equest . 101 8.3.1.14 Unit to Unit Voice Channel Grant Update 101 8.3.1.15 ACK Response . 103 8.3.1.16 SNDCP Data Channel Grant 104 8.3.1.17 SNDCP Data Page Request . 104 TIA-102.BBAC v 8.3.1.18 SNDCP Data Channel Announcement Explicit. 105 8.3.1.19 Adjacent Status Broadcast 106 8.3.1.20 Call Alert
36、. 107 8.3.1.21 Extended Function Command 108 8.3.1.22 Group Affiliation Query . 108 8.3.1.23 Identifier Update . 109 8.3.1.24 Time and Date Announcement 110 8.3.1.25 Network Status Broadcast 111 8.3.1.26 Group Voice Service Request 112 8.3.1.27 RFSS Status Broadcast . 112 8.3.1.28 Secondary Control
37、Channel Broadcast 113 8.3.1.29 Status Query 114 8.3.1.30 Queued Response 115 8.3.1.31 Deny Response 115 8.3.1.32 System Service Broadcast 116 8.3.1.33 Unit Registration Command 116 8.3.1.34 Radio Unit Monitor Command 117 8.3.1.35 Identifier Update for VHF/UHF Bands . 117 8.3.1.36 Identifier Update f
38、or TDMA 118 8.3.1.37 Manufacturer Message . 118 8.3.1.38 Individual Paging Message 119 8.3.1.39 Group Paging Message . 121 8.3.1.40 Power Control Signal Quality 122 8.3.1.41 MAC_Release . 122 8.4 MAC FIELDS DEFINITION . 123 8.4.1 Opcode. 123 8.4.2 Offset . 123 8.4.3 RF Level 125 8.4.4 BER 126 8.4.5
39、CRC . 126 8.4.6 Unforced/Forced (U/F) Field 127 8.4.7 Call Preemption/Audio Preemption (C/A) Field . 128 8.4.8 Color Code 128 8.4.9 Other Fields from Phase 1. 129 ANNEX A GALOIS FIELD FOR REED SOLOMON CODES (INFORMATIVE) . 131 A.1 GF(64) ARITHMETIC . 131 A.2 EXPONENTIAL AND LOGARITHM TABLES 131 A.3
40、MOTHER CODE GENERATOR MATRIX FOR (63,35,29) RS CODE . 132 ANNEX B OSP MCO OPCODE LIST (INFORMATIVE) . 136 ANNEX C EXAMPLES OF PTT AND CALL TERMINATION ON VCH0 AND VCH1 (INFORMATIVE) . 138 ANNEX D EXAMPLES OF CALL SETUP ON VCH0 (INFORMATIVE) 142 ANNEX E BURST BIT LOCATIONS (NORMATIVE) . 151 TIA-102.B
41、BAC vi LIST OF FIGURES FIGURE 1-1 REPRESENTATIVE PROTOCOL MODEL FOR P25 TWO-SLOT TDMA TRUNKED VOICE SERVICE 2 FIGURE 3-1 SUPERFRAME STRUCTURE FOR TWO-SLOT TDMA. 11 FIGURE 3-2 ULTRAFRAME STRUCTURE . 11 FIGURE 3-3 VCH 0 STRUCTURE 13 FIGURE 3-4 VCH 1 STRUCTURE 13 FIGURE 3-5 SYNC_BCST MESSAGE RELATIONSH
42、IP TO FDMA CCH . 18 FIGURE 3-6 TDMA SUPERFRAME RELATIONSHIP TO FDMA CCH MICRO-SLOT 19 FIGURE 3-7 ALIGNMENT OF FDMA AND TDMA SYMBOLS AT SYNCD MINUTE BOUNDARY 19 FIGURE 4-1 INBOUND AND OUTBOUND BURST STRUCTURE 21 FIGURE 4-2 INBOUND 4 VOICE BURST STRUCTURE WITH ESS 22 FIGURE 4-3 INBOUND 2 VOICE/SHORT S
43、IGNALING BURST STRUCTURE WITH ESS 23 FIGURE 4-4 OUTBOUND 4 VOICE BURST STRUCTURE WITH ESS . 24 FIGURE 4-5 OUTBOUND 2 VOICE BURST STRUCTURE WITH ESS . 25 FIGURE 4-6 INBOUND SIGNALING BURST STRUCTURE WITH SYNCHRONIZATION 26 FIGURE 4-7 OUTBOUND SIGNALING BURST STRUCTURE WITH SYNCHRONIZATION 27 FIGURE 4
44、-8 OUTBOUND SIGNALING BURST STRUCTURE WITHOUT SYNCHRONIZATION 28 FIGURE 5-1 DUID CODEWORD CONSTRUCTION FOR (8,4,4) BINARY CODE 31 FIGURE 5-2 ISCH CONTAINING INFORMATION 33 FIGURE 5-3 ISCH OF PAYLOAD VCH TIMESLOT . 34 FIGURE 5-4 ISCH COSET CODE WORD CONSTRUCTION 35 FIGURE 5-5 DERIVED CODES FROM MOTHE
45、R CODE 36 FIGURE 5-6 IEMI DISTRIBUTION . 37 FIGURE 5-7 S-OEMI DISTRIBUTION 37 FIGURE 5-8 I-OEMI DISTRIBUTION . 38 FIGURE 5-9 ESS DISTRIBUTION . 39 FIGURE 6-1 VOICE BURSTS REPETITIVE PATTERN . 41 FIGURE 6-2 EXAMPLE VOICE BURST SEQUENCING 41 FIGURE 7-1 INTERNAL LFSR GENERATOR OF SCRAMBLE SEQUENCE . 51
46、 FIGURE 7-2 EXTERNAL LFSR GENERATOR OF SCRAMBLE SEQUENCE 51 FIGURE 7-3 MATRIX TO CONVERT TO INTERNAL LFSR 53 FIGURE 7-4 MATRIX TO ADVANCE EXTERNAL LFSR 243 SHIFT CYCLES . 54 FIGURE 7-5 SCRAMBLING SEQUENCE OFFSETS . 56 FIGURE 8-1 STRUCTURE OF MAC PDU . 77 FIGURE 8-2 OUTBOUND MAC PDU FORMATS 78 FIGURE
47、 8-3 INBOUND MAC PDU IN IEMI (19.5 OCTETS) . 79 FIGURE 8-4 INBOUND MAC_PTT PDU (19.5 OCTETS) . 80 FIGURE 8-5 OUTBOUND MAC_PTT PDU (19.5 OCTETS) 81 FIGURE 8-6 OUTBOUND MAC_PTT PDU (22.5 OCTETS) 82 FIGURE 8-7 INBOUND MAC_END_PTT PDU (19.5 OCTETS) . 83 FIGURE 8-8 OUTBOUND MAC_END_PTT PDU (19.5 OCTETS)
48、84 FIGURE 8-9 OUTBOUND MAC_END_PTT PDU (22.5 OCTETS) 85 FIGURE 8-10 GENERIC OUTBOUND MAC INFORMATION FORMATS 86 FIGURE 8-11 SUBSCRIBER UNIT IDENTIFICATION FORMAT . 88 FIGURE 8-12 NULL INFORMATION MESSAGE. 91 FIGURE 8-13 GROUP VOICE CHANNEL USER MESSAGE ABBREVIATED FORMAT . 91 FIGURE 8-14 GROUP VOICE
49、 CHANNEL USER MESSAGE EXTENDED FORMAT . 92 FIGURE 8-15 UNIT TO UNIT VOICE CHANNEL USER MESSAGE ABBREVIATED FORMAT . 92 FIGURE 8-16 UNIT TO UNIT VOICE CHANNEL USER MESSAGE EXTENDED FORMAT 93 FIGURE 8-17 TELEPHONE INTERCONNECT VOICE CHANNEL USER MESSAGE 93 FIGURE 8-18 UNIT TO UNIT VOICE REQUEST ABBREVIATED FORMAT . 94 FIGURE 8-19 UNIT TO UNIT VOICE REQUEST EXTENDED FORMAT . 94 FIGURE 8-20 GROUP VOICE CHANNEL GRANT UPDATE MULTIPLE . 95 FIGURE 8-21 GROUP VOICE CHANNEL GRANT UPDATE MULTIPLE - EXPLICIT . 95 FIGURE 8-22 GROUP VOICE CHANNEL GRANT - ABBREVIATED FORMAT 96 FIGURE
