1、 TIA-102.BBAC-1 (Addendum to TIA-102.BBAC) February 2013Project 25 Phase 2 Two-Slot TDMA Media Access Control Layer Description Addendum 1 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purch
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22、ISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-102.BBAC-1ii Foreword (This foreword is not part of this addendum.) This addendum is being promulgated by the TR-8.12 (Two-Slot TDMA) subcommittee and its working groups under the sponsorship of the Telecommunications Industry Association. The Phase 2 Trunk
23、ed Two-Slot Time Division Multiple Access (TDMA) Voice Services Standard, which includes definition of the new two-slot TDMA common air interface, was developed by the APIC TDMA Task Group and TIA TR-8.12 to be consistent with the APCO/NASTD/FED Project 25 Statement of Requirements (SoR) adopted by
24、the APCO/NASTD/FED Project 25 Steering Committee. The standard used the SoR dated October 17, 2008 as input guidance to capture the relevant user needs requirements. The two-slot TDMA Media Access Control (MAC) layer protocol specification, which is a component of the Phase 2 TDMA two-slot common ai
25、r interface definition, established a TIA standard supporting the provision of trunked voice services using a two-slot TDMA modulation format within a 12.5 kHz bandwidth physical radio channel. TIA makes no claims as to the applicability of the information contained in this document for any purpose
26、although it is believed that the information will prove to be invaluable to implementers and operators of Phase 2 two-slot TDMA equipment. Some aspects of the information contained in this document may not have been fully operationally tested; however, a great deal of time and good faith effort has
27、been invested in the preparation of this document to ensure the accuracy of the information it contains. While all reasonable efforts have been made to ensure the accuracy of this document, it should be understood that significant work remains to fully develop the standard series and all standard se
28、ries documents will be updated as necessary. TIA-102.BBAC-1 iii TABLE OF CONTENTS LIST OF FIGURES . iv LIST OF TABLES v ADDENDUM INTRODUCTION 1 OBSOLESCENCE 1 DOCUMENT REVISION 1 ADDENDUM CHANGES 2 5.1 SYNCHRONIZATION SEQUENCES 2 5.2 PILOT SEQUENCE . 4 7.2.5 Scrambling 4 7.3.1 Assigned VCH Initial A
29、ccess Procedures (Call Setup) 11 7.3.2 Assigned VCH Maintenance Procedures (Traffic Mode) . 13 7.3.3 Assigned VCH Termination (Call Teardown) 15 7.3.3.2 Message Trunked Termination 16 7.3.4.2 Call Continuation on VCH 17 7.3.5.1.1.2 System Response 18 7.3.5.1.1.3 Requesting Subscriber Unit Actions .
30、19 7.3.5.1.1.4 Voice Channel Transition and Signaling 21 7.3.5.2.1.3 Requesting Subscriber Unit Actions . 23 7.3.5.2.1.4 Voice Channel Transition and Signaling 25 8.3 MAC MESSAGE DETAILS 27 8.3.1.3 Unit to Unit Voice Channel User Message 31 8.3.1.12 Radio Unit Monitor Enhanced Command . 33 8.3.1.21
31、Extended Function Command . 34 8.3.1.34 Radio Unit Monitor Command-OBSOLETE 36 8.3.1.37 Manufacturer Message 37 8.3.1.42 Status Update. 38 TIA-102.BBAC-1iv 8.3.1.43 Message Update 40 8.3.1.44 Radio Unit Monitor Command 42 8.4.2 Offset 44 ANNEX B OSP MCO OPCODE LIST (INFORMATIVE) 46 ANNEX E BURST BIT
32、 LOCATIONS (NORMATIVE) 50 LIST OF FIGURES FIGURE 7-1 INTERNAL LFSR GENERATOR OF SCRAMBLE SEQUENCE . 5 FIGURE 7-2 EXTERNAL LFSR GENERATOR OF SCRAMBLE SEQUENCE 5 FIGURE 7-3 MATRIX TO CONVERT TO INTERNAL LFSR 7 FIGURE 7-4 MATRIX TO ADVANCE EXTERNAL LFSR 243 SHIFT CYCLES . 8 FIGURE 7-5 SCRAMBLING SEQUEN
33、CE OFFSETS . 10 FIGURE 8-15 UNIT TO UNIT VOICE CHANNEL USER MESSAGE ABBREVIATED FORMAT . 31 FIGURE 8-16 UNIT TO UNIT VOICE CHANNEL USER MESSAGE EXTENDED FORMAT 32 FIGURE 8-30 RADIO UNIT MONITOR ENHANCED COMMAND - ABBREVIATED FORMAT 33 FIGURE 8-43 EXTENDED FUNCTION COMMAND EXTENDED FORMAT . 35 FIGURE
34、 8-60 RADIO UNIT MONITOR COMMAND-OBSOLETE . 36 FIGURE 8-63 MANUFACTURER MESSAGE 37 FIGURE 8-68 STATUS UPDATE - ABBREVIATED FORMAT 38 FIGURE 8-69 STATUS UPDATE - EXTENDED FORMAT . 39 FIGURE 8-70 MESSAGE UPDATE- ABBREVIATED FORMAT 40 FIGURE 8-71 MESSAGE UPDATE - EXTENDED FORMAT . 41 FIGURE 8-72 RADIO
35、UNIT MONITOR COMMAND-ABBREVIATED FORMAT 42 FIGURE 8-73 RADIO UNIT MONITOR COMMAND-EXTENDED FORMAT 43 FIGURE 8-74 OFFSET FIELD USAGE . 45 TIA-102.BBAC-1 v LIST OF TABLES TABLE 5-1 SYNCHRONIZATION SEQUENCES . 3 TABLE 8-2 MAC MESSAGE LENGTHS 26 TABLE B- 1: REFERENCE 2 OSP OPCODE SUMMARY 46 TABLE E- 1:
36、INBOUND 4V BURST BIT ALLOCATIONS . 50 TABLE E- 2:INBOUND 4V BURST ESS BIT ALLOCATIONS 54 TABLE E- 3: INBOUND 2V BURST BIT ALLOCATIONS . 56 TABLE E- 4: INBOUND SIGNALING WITH SYNC BURST BIT ALLOCATIONS . 60 TABLE E- 5: OUTBOUND 4V BURST BIT ALLOCATIONS . 64 TABLE E- 6: OUTBOUND 4V BURST ESS BIT ALLOC
37、ATIONS 68 TABLE E- 7: OUTBOUND 2V BURST BIT ALLOCATIONS . 70 TABLE E- 8: OUTBOUND SIGNALING WITH SYNC BURST BIT ALLOCATIONS . 74 TABLE E- 9: OUTBOUND SIGNALING NO SYNC BURST BIT ALLOCATIONS . 78 TIA-102.BBAC-1 1 ADDENDUM INTRODUCTION The pupose of this addendum is to update information and correct e
38、rrata contained in TIA-102.BBAC , “Phase 2 Two-Slot TDMA Media Access Control Layer Description”. OBSOLESCENCE The reference to obsolete is used to indicate specific sections of the document which are no longer current. The term is typically used in this document to indicate that specific voice chan
39、nel messages are no longer supported by the standard and have been replaced with another mechanism. The messages are left in the document as previous implementations may have made assumptions about their use and specifically the corresponding opcode may not be re-used. DOCUMENT REVISION HISTORY Vers
40、ion Date Description 0.0 November 2012 Approved for TIA Publication TIA-102.BBAC-1 2 Addendum changes to TIA-102.BBAC start here. Note that section numbers identified in this addendum directly translate to section numbers in TIA-102.BBAC. 5.1 Synchronization Sequences There are four different synchr
41、onization sequences in the traffic channel signaling. The first is an inbound synchronization sequence that occurs in a MAC information signaling slot (clause 4) that has 22 symbols. The second occurs in an outbound signaling slot and has 21 symbols. The third and fourth kinds of synchronization seq
42、uences are in the outbound ISCH and contains 20 symbols. The sync pattern for the outbound ISCH is also mentioned in 3.3.4. The synchronization sequences are given in this subclause. The synchronization sequences are transmitted in the order from top to bottom; the top symbol is transmitted first an
43、d the bottom symbol is transmitted last. The signed dibit symbols, in order of transmission, for the various synchronization sequences that occur in MAC signaling are shown in Table 5-1. TIA-102.BBAC-1 3 Table 5-1 Synchronization Sequences Symbol/Dibit Name IEMI Sync S-OEMI Sync VCH S-ISCH Sync CCH
44、S-ISCH Sync (Informative) S(21) +3 S(20) +3 -3 S(19) -3 -3 +3 -3 S(18) -3 -3 +3 -3 S(17) +3 -3 +3 -3 S(16) +3 +3 -3 -3 S(15) +3 +3 +3 -3 S(14) -3 +3 +3 +3 S(13) +3 +3 -3 -3 S(12) -3 +3 +3 -3 S(11) -3 -3 +3 -3 S(10) +3 +3 +3 +3 S(9) +3 -3 +3 +3 S(8) +3 +3 -3 +3 S(7) +3 -3 -3 +3 S(6) -3 -3 -3 -3 S(5)
45、+3 +3 +3 +3 S(4) -3 +3 -3 +3 S(3) -3 -3 -3 -3 S(2) -3 -3 -3 +3 S(1) -3 +3 -3 +3 S(0) -3 +3 -3 +3 TIA-102.BBAC-1 4 5.2 Pilot Sequence The pilot sequences are 8 bit fields found in inbound bursts and are composed of two sets of four symbols defined in this document and referenced in R3. The signed dib
46、it symbols for the pilot sequences are defined as follows. P1(3) P1(2) P1(1) P1(0) = +1, 1, +1, 1 P2(3) P2(2) P2(1) P2(0) = 1, +1, 1, +1 The pilot sequence P1 is sent at the beginning of the inbound bursts without sync, which is shown as the left most P in Figure 4-1, Figure 4-2, and Figure 4-3. The
47、 pilot sequence P2 is sent at the end of the inbound burst, including bursts with or without sync, which is shown as the right most P in Figure 4-1, Figure 4-2, Figure 4-3, and Figure 4-6. The first four symbols of the inbound signaling burst with sync shown in Figure 4-6 are characterized as pilot
48、symbols, and in that specific instance the pilot symbols would correspond to the first four symbols of the inbound synchronization sequence given in Table 5-1. 7.2.5 Scrambling Scrambling of specific PDUs on a TDMA channel is used to help reject messages from an interfering P25 TDMA system from bein
49、g interpreted as a valid message to/from the primary system. The inbound and outbound voice bursts (2V and 4V) are always scrambled. The signaling bursts are optionally scrambled. A description of the bits that are scrambled are provided later in this subclause. TIA-102.BBAC-1 5 The information used for the scrambling seed is obtained from the Network Status Broadcast message on the FDMA control channel or the Network Status Broadcast MAC message on the TDMA channel. This scrambling is only performed on the TDMA channel. The specific informati
