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22、has been submitted to PROJECT 25 by the Telecommunications Industry Association (TIA), as provided for in a Memorandum of Understanding (MOU) dated December 1993. That MOU provides that PROJECT 25 will devise a Common System Standard for digital public safety communications (the Standard), and that
23、TIA shall provide technical assistance in the development of documentation for the Standard. This document has been developed with inputs from the TIA Project 25 Interface Committee (APIC), the APIC TDMA Task Group, TR8.12, and TIA industry members. This document is being published because it is fel
24、t that there is a need for Project 25 to set a standard for spectrum efficiency equivalent to 6.25 kHz as stated by the FCC. Technology choices for the TDMA Two-Slot Air Interface are based on Project 25 Steering Committee decisions regarding the vocoder, modulations, and overall bit rate made at th
25、eir meeting of 27-April-2007. This document defines an overview of Two-Slot TDMA in a P25 system. iiTSB-102.BBAA Patent Identification The readers attention is called to the possibility that compliance with this document may require the use of one or more inventions covered by patent rights. By publ
26、ication 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 to grant licenses under those rights on reasonable and nondiscriminatory ter
27、ms 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 patents have been identified. TIA shall not be responsible for identifying patents for which licenses may
28、 be required by this document or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention.iiiTSB-102.BBAA TABLE OF CONTENTS 1. Objectives of the Project 25 Two-Slot TDMA Standard 1 1.1 Abbreviations and Acronyms . 2 1.2 Revision History . 3 2. Scop
29、e of the P25 Two-Slot TDMA Standard . 4 3. Informative References. 5 4. Documentation Suite for the P25 Phase 2 Two-Slot TDMA Standard 6 4.1 Project 25 Vocoder Description 8 4.2 Two-Slot TDMA Common Air Interface . 8 4.3 Additions to Phase 1 Trunking for Phase 2 9 4.4 Additions to Phase 1 Encryption
30、 for Phase 2 10 4.5 Two-Slot TDMA CAI Measurement Methods. 10 4.6 Two-Slot TDMA CAI Performance Recommendations. 10 4.7 Two-Slot TDMA CAI Conformance Tests. 10 4.8 Two-Slot TDMA CAI Interoperability Tests . 10 4.9 Two-Slot TDMA Recommended Compliance Assessment Tests 11 4.10 Project 25 ISSI Messages
31、 and Procedures 11 5. General Description of the P25 Two-Slot TDMA CAI 12 6. Bit Rate and Modulation for the P25 Two-Slot TDMA CAI . 13 7. Vocoder. 14 8. Trunking Control 15 9. Encryption. 16 10. Phase 1 Interoperability, Compatibility, and Migration . 17 11. Options Associated with the P25 Two-Slot
32、 TDMA Standard 20 TABLE OF FIGURES Figure 5-1 Representative P25 Phase 2 System Model Illustrating Support of the New Phase 2 Two-Slot TDMA CAI (Um2) and the Phase 1 12.5 kHz FDMA CAI (Um) . 12 TABLE OF TABLES Table 4-1 P25 Two-Slot TDMA Standards Summary. 7 ivTSB-102.BBAA 1. Objectives of the Proje
33、ct 25 Two-Slot TDMA Standard The objectives of the Project 25 Standard that were expressed in the APCO Project 25 System and Standards Definition bulletin, TSB-102-A 1, are as follows. Obtain maximum radio spectrum efficiency Ensure competition in system life cycle procurement Allow effective, effic
34、ient and reliable intra-agency and inter-agency communications Provide user friendly equipment The APCO Project 25 Statement of Requirements 2 defines a key goal to achieve spectrum efficiency in Phase 2 equivalent to four-to-one spectrum utilization in a 25 kHz channel. The Project 25 (P25) Two-Slo
35、t TDMA Standard for Phase 2 doubles the spectrum efficiency of the Phase 1 Standard for 12.5 kHz operation to contribute to the first objective of the Project 25 standard suite and a key goal of the Statement of Requirements. The Two-Slot TDMA Standard also maintains interoperability and compatibili
36、ty with the Phase 1 Standard, including support for the Inter-RF Sub-System Interface (ISSI). The P25 Phase 2 Two-Slot TDMA Standard is based on the P25 Phase 2 12.5 kHz TDMA (i.e., Two-Slot TDMA) requirements defined in the P25 Statement of Requirements to preserve the achievement of the other thre
37、e objectives. Section 2 provides an overview of the scope of the P25 Two-Slot TDMA Standard. Section 3 identifies the informative references cited in this document. Section 4 gives a brief description of the suite of standards associated with the P25 Two-Slot TDMA Standard. Section 5 provides a gene
38、ral description of P25 Two-Slot TDMA Common Air Interface (CAI). Section 6 introduces the bit rate and modulation for the P25 Two-Slot TDMA CAI. Section 7 introduces the P25 vocoder associated with the P25 Two-Slot TDMA Standard. Section 8 introduces trunking control aspects of the P25 Two-Slot Stan
39、dard. Section 9 introduces encryption and security aspects of the P25 Two-Slot Standard. Section 10 introduces aspects of interoperability, compatibility, and migration addressed by the P25 Two-Slot Standard. Section 11 introduces options associated with the P25 Two-Slot Standard. 1TSB-102.BBAA 1.1
40、Abbreviations and Acronyms Abbreviations and acronyms used in this document include the following. 6.25e Equivalent to 6.25 kHz channel efficiency, i.e.,efficiency equivalent to one voice per 6.25 kHz of channel bandwidth A Mobile Data Terminal Interface ALGID Algorithm Identifier for an encryption
41、algorithm APCO Association of Public-Safety Communications Officials C4FM Compatible 4 Level Frequency Modulation CAI Common Air Interface CAP Project 25 Compliance Assessment Program CCH Trunking Control Channel DCH Data channel EcConsole Interface EdData Host Network Interface EfFixed Station Conv
42、entional Interface EnNetwork Management Interface ESS Encryption Synchronization Signaling, concatenates MI, ALGID, KID EtPSTN Interface FDMA Frequency Division Multiple Access G ISSI, Inter-RF SubSystem Interface H-CPM Harmonized Continuous Phase Modulation H-D8PSK Harmonized Differential 8 Phase S
43、hift Keying, a proposed future modulation for TDMA for improved simulcast delay spread H-DQPSK Harmonized Differential Quadrature Phase Shift Keying ID Identifier ISCH Inter-slot Signaling Channel ISSI Inter-RF SubSystem Interface kb/s Kilobits per second kHz Kilohertz KID Key Identifier for an encr
44、yption key LCW Link Control Word for trunking control MAC Media Access Control sublayer MI Message Indicator for encryption synchronization ms Milliseconds OTAR Over The Air Rekeying P25 Project 25, usually referring to the Project 25 standards P25 Phase 1 Refers in part to Project 25 FDMA and CQPSK
45、 standards 2 P25 Phase 2 Refers in part to Project 25 TDMA standards 2 PDU Protocol Data Unit, a term used frequently in the MAC layer PHY Physical layer PSTN Public Switched Telephone Network RF Radio Frequency RTP Real-time Transport Protocol 2TSB-102.BBAA TCH Traffic channel TDMA Time Division Mu
46、ltiple Access TIA Telecommunications Industry Association TSB Technical Systems Bulletin of the TIA TSBK Trunking Signaling Block for trunking control UmP25 Phase 1 FDMA Common Air Interface Um2P25 Phase 2 Two-Slot TDMA Common Air Interface 1.2 Revision History Version 0.4, 29-September-2008, revise
47、d using comments from TR8.12, document 08-07-011 Version 0.5, 11-November-2008, revised using comments from TR8.12, documents 08-07-011-R1 through R3. Version 0.6, 20-November-2008, revised using comments from TR8.12, document 08-07-011-R4 Version 0.7, 2-December-2008, revised using comments from TR
48、8.12, document 08-07-011-R5 Version 0.8, 10-December-2008, revised using comments from TR8.12, document 08-07-011-R6 APCO Project 25 System and Standards Definition; November 1995 2 APCO Project 25 Statement of Requirements; October 17, 2008 3 TIA-102.BABA-1; Project 25 Half Rate Vocoder Annex 4 TIA
49、-102.AAAD; Project 25 Block Encryption Protocol; with Addendum for encryption protocol for a half rate vocoder 5 TIA-102.AABC-B-4; Project 25 Trunking Control Channel Messages Addendum for TDMA 6 TSB-102.BABE; Project 25 Vocoder Evaluation Mean Opinion Score Test; 2007 7 TIA-102.AACA; Project 25 Digital Over the Air Rekeying Protocol; 2003 8 TIA-102.BACA; Project 25 Inter RF Subsystem Interface Messages and Procedures for Voice Services; including addenda 1, 2, and 3; 2007 9 TIA-102.AABD; Project 25 Trunking Procedures; 2007 10 TIA-102.AAB
