1、 TIA-102.BBAD August 2017Project 25 Two-Slot TDMA Control Channel MAC Layer Specification NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improv
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19、LITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-102.BBAD i Foreword (This foreword is not part of this document.) This document has been created in respo
20、nse 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 Committee shall devise a Common System Standard for digital public safety communications (the Standard)
21、 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 documentation for the Standard. If the abbreviation “P25” or the wording “Project 25” appears on the cover sh
22、eet 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 “Project 25” on the cover sheet of this document or in the title of any document referenced herein should no
23、t 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-8.12 Two Slot TDMA Subcommittee and provides a specification of the Two-Slot TDMA Control Channel MAC Layer whic
24、h is a component of the Two-Slot TDMA common air interface that established a TIA standard for trunked voice services using a two-slot TDMA modulation format within a 12.5 kHz bandwidth radio channel for TIA-102 Land Mobile Radio systems. This document describes the bursts, coding, protocol data uni
25、ts, and message formats for the TDMA control channel component of the Two-Slot TDMA common air interface. There are four annexes in this document. Annex A is normative and is considered part of this document. Annexes B, C, and D are informative and are not considered part of this document. TIA does
26、not evaluate, test, verify or investigate the information, accuracy, soundness, or credibility of the contents of the Document. In Publishing the Document, TIA disclaims any undertaking to perform any duty owed to or for anyone. Some aspects of the specifications contained in this document may not h
27、ave been fully operationally 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.BBAD ii Patent Identification The readers attention is called to the possibility that complian
28、ce with this document may require 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
29、statements of willingness to grant licenses under those rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such licenses. The following patent holders and patents have been identified in accordance with the TIA intellectual property rights policy: No pat
30、ents have been identified TIA 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.BBAD iii Table of Contents 1. Introduction . 1 1
31、.1 Scope . 1 1.2 References . 1 1.2.1 Normative References 1 1.2.2 Informative References 2 1.3 Acronyms and Abbreviations 2 1.4 Definitions . 3 1.5 Conventions . 4 1.5.1 Message Bit Numbering . 4 1.5.2 PDU and Message Formats . 4 1.5.3 Symbols 4 2. Architecture 5 2.1 Single Logical Control Channel
32、5 2.2 Dual Logical Control Channel . 5 2.3 Multiple Logical Control Channels 5 2.4 Composite Control Channel . 6 2.5 Logical Control Channel Encryption . 6 3. Channel Structure 7 3.1 MAC Layer Structure 7 3.2 Logical Voice Channel 8 3.3 Logical Control Channel (LCCH) 8 3.4 ISCH . 9 3.4.1 S-ISCH . 10
33、 3.4.2 I-ISCH . 11 3.5 Time Alignment. 11 4. Burst Structures . 12 4.1 Inbound Burst . 12 4.1.1 Structure . 12 4.1.2 Coding 13 4.2 Outbound Burst 14 4.2.1 Structure . 14 4.2.2 Coding 15 4.3 Synchronization 16 4.4 DUID . 16 4.5 I-ISCH . 17 5. Procedures 19 5.1 CCH Designation and Usage . 19 5.2 Curre
34、nt Site 19 5.3 Adjacent Site 19 5.4 Secondary CCH 20 5.5 CCH Acquisition . 20 TIA-102.BBAD iv 5.6 Scrambling 21 5.7 Composite Control Channel 21 5.8 LCH Transition Procedures . 21 5.8.1 FNE Procedures for Transition from LCCH to TCH 22 5.8.2 SU Procedures for Transition from LCCH to TCH 22 5.8.3 FNE
35、 Procedures for Transition from TCH to LCCH 23 5.8.4 SU Procedures for Transition from TCH to LCCH 23 5.9 VCH Synchronization 23 5.10 CCH Access and Parameters . 23 6. Signaling 24 6.1 MAC PDUs . 24 6.1.1 LCCH PDUs 24 6.1.1.1 Outbound LCCH PDU . 24 6.1.1.2 Inbound LCCH PDU . 25 6.1.1.3 LCCH PDU Defi
36、nitions 25 6.1.2 VCH PDUs 29 6.1.2.1 Outbound VCH PDU Types 29 6.1.2.2 Inbound VCH PDU Type . 30 6.1.2.3 VCH PDU Definitions 30 6.1.2.3.1 VCH MAC_PTT PDU 30 6.1.2.3.2 VCH MAC_END_PTT PDU 32 6.1.2.3.3 VCH MAC_IDLE, MAC_ACTIVE, approved by the Project 25 Steering Committee June 22, 2017 as part of the
37、 Project 25 Standard TIA-102.BBAD 1 1. Introduction The objective of this document is to provide a specification of the Media Access Control (MAC) layer protocol for a control channel that employs the two-slot Time Division Multiple Access (TDMA) Common Air Interface (CAI) within a 12.5 kHz bandwidt
38、h physical radio channel. An overview of the two-slot TDMA CAI is provided in 9 and is referred to as the Um2interface as described in 8. 1.1 Scope This document specifies the MAC layer protocol for a logical control channel on the Um2interface. This document specifies the following aspects of the l
39、ogical control channel MAC layer: Logical channel structure Burst descriptions and field definitions Logical control channel procedures Logical control channel messages The information necessary to enable an interoperable MAC layer protocol for a two-slot TDMA control channel is provided in this doc
40、ument or referenced in other documents as appropriate. This document assumes the reader has a good working knowledge of the two-slot TDMA document suite identified in 9 and of trunked LMR systems as described in 8. 1.2 References The appearance of “Project 25” in references below indicates the TIA d
41、ocument has been adopted by the Project 25 Steering Committee as part of its Project 25 standard, i.e. “the Standard.” 1.2.1 Normative References The following documents contain provisions that, through reference in this text, constitute provisions of this document. At the time of publication, the e
42、ditions indicated were valid. All documents are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. ANSI and TIA maintain registers of currently valid national stand
43、ards published by them. 1 TIA-102.AAAD-B, Project 25 Digital Land Mobile Radio Block Encryption Protocol, ANSI/TIA, December 2015 2 TIA-102.AABC-D, Project 25 Trunking Control Channel Messages, ANSI/TIA, April 2015; TIA-102.AABC-D-1, Project 25 Trunking Control Channel Messages Addendum 1, ANSI/TIA,
44、 November 2016 3 TIA-102.AABD-B, Project 25 Trunking Procedures, TIA, November 2014 4 TIA-102.AABH, Project 25 Dynamic Regrouping Messages and Procedures, TIA, November 2014 5 TIA-102.BAAA-B, Project 25 FDMA Common Air Interface, ANSI/TIA, June 2017 TIA-102.BBAD 2 6 TIA-102.BBAB, Project 25 Phase 2
45、Two-Slot Time Division Multiple Access Physical Layer Protocol Specification, TIA, July 2009 7 TIA-102.BBAC, Project 25 Phase 2 Two-Slot TDMA Media Access Control Layer Description, TIA, December 2010; TIA-102.BBAC-1, Project 25 Phase 2 Two-Slot TDMA Media Access Control Layer Description Addendum 1
46、, TIA, February 2013 1.2.2 Informative References 8 TSB-102-C, Project 25 TIA-102 Documentation Suite Overview, TIA, March 2016 9 TSB-102.BBAA Project 25 Two-Slot TDMA Overview, TIA, March 2010 1.3 Acronyms and Abbreviations ALGID Algorithm Identifier ANSI American National Standards Institute BER B
47、it Error Rate C4FM Compatible 4-level Frequency Modulation CAI Common Air Interface CCH Control Channel CQPSK Compatible QPSK CRC Cyclic Redundancy Check DCH Data Channel DUID Data Unit ID ESS Encryption Synchronization Signaling ETDU Expanded Terminator Data Unit FACCH Fast Associated Control Chann
48、el FDMA Frequency Division Multiple Access FEC Forward Error Correction FNE Fixed Network Equipment GF Galois Field GID Group ID HDU Header Data Unit ID Identifier IECI Inbound Encoded Control Information IEMI Inbound Encoded MAC Information ISCH Inter-Slot Signaling Channel ISP Inbound Signaling Pa
49、cket I-ISCH Information ISCH I-OEMI Information OEMI KID Key ID LCH Logical Channel LFSR Linear Feedback Shift Register LSB Least Significant Bit MAC Media Access Control MCO MAC Protocol Data Unit Opcode MFID Manufacturers ID TIA-102.BBAD 3 MI Message Indicator MSB Most Significant Bit NAC Network Access Code OECI Outbound Encoded Control Information OEMI Outbound Encoded MAC Information OSP Outbound Signaling Packet PDU Protocol Data Unit PTT Push-To-Talk QPSK Quadrature Phase Shift Keying RS Reed-Solomon SACCH Slow Associated Control Channel SGID Su
