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27、 and Security Networks, Motorola Inc., or Tyco Electronics Corporation other than provided in the copyright statement above. TIA-102.BBAB i Foreword (This foreword is not part of this standard.) This document has been published by the Telecommunications Industries Association (TIA) in accordance wit
28、h the terms and conditions provided for in a Memorandum of Understanding (MoU) executed by and between the TIA, the Association of Public-Safety Officials (APCO), the National Association of State Telecommunications Directors (NASTD), and the various agencies of the Federal government (FED). This TI
29、A standard is being promulgated and will be maintained by the TR-8.12 (Two-Slot TDMA subcommittee) and working groups under the sponsorship of the Telecommunications Industry Association. This document has been published as a TIA Standard because it contains useful technical information on emerging
30、digital techniques for Land Mobile Radio Service. The P25 Two-Slot TDMA Standard, which includes definition of the P25 two-slot TDMA common air interface, is being developed by the APIC TDMA Task Group and TIA TR-8.12 to be consistent with the APCO Project 25 Statement of Requirements adopted by the
31、 Project 25 Steering Committee. This standard uses the APCO Project 25 Statement of Requirements dated October 17, 2008 as input guidance to capture the relevant user needs requirements. This physical layer protocol specification provides a standard for the definition and control of the transmission
32、 of digital information utilizing a two-slot TDMA modulation format within a 12.5 kHz bandwidth physical radio channel. The TIA makes no claims as to the applicability of the information contained in this document for any purpose although it is believed that the information will prove to be invaluab
33、le to implementers and operators of P25 two-slot TDMA equipment. Some aspects of the specifications contained in this document may not have 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 accurac
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38、n. TIA-102.BBAB iii TABLE OF CONTENTS 1. INTRODUCTION. 1 2. SCOPE 3 2.1 Overview. 3 2.2 Revision History 4 2.3 References . 4 2.3.1 Normative references. 4 2.3.2 Informative references 5 2.4 Glossary . 5 2.4.1 Acronyms and abbreviations 5 3. TWO-SLOT TDMA TRANSMISSION FORMAT . 6 4. TWO-SLOT TDMA MOD
39、ULATION. 8 4.1 H-CPM Uplink Modulation. 8 4.1.1 General formula for CPM . 9 4.1.2 Characteristics of H-CPM modulation 10 4.1.3 H-CPM demodulation. 11 4.2 H-DQPSK Downlink Modulation . 12 4.2.1 General formula for H-DQPSK . 13 4.2.2 H-DQPSK demodulation 13 4.3 Ramping . 14 5. TWO-SLOT TDMA BURST STRU
40、CTURE 17 5.1 Normal Burst 17 5.1.1 Outbound format 17 5.1.2 Inbound format . 17 ANNEX A H-D8PSK MODULATION (INFORMATIVE) 19 TIA-102.BBAB iv This page intentionally left blank.TIA-102.BBAB 1 1. Introduction This standard specifies the physical layer protocol for the definition and control of the tran
41、smission of digital information using a two-slot Time Division Multiple Access (two-slot TDMA) modulation format within a 12.5 kHz bandwidth physical radio channel. As described below, this standard is included in the suite of Project 25 (P25) standards that defines the P25 Phase 2 Two-Slot TDMA Sta
42、ndard. Specifically, this standard defines the physical layer, or Open Systems Interconnection (OSI) Layer 1, protocol including the modulation scheme used for the P25 Two-Slot TDMA Common Air Interface (CAI). The P25 Two-Slot TDMA CAI, designated Um2, is the P25-defined interface between P25 fixed/
43、base station equipment and P25 radios (i.e., P25 subscriber units (SUs) as shown in Figure 1 and described further below. Fixed Station Conventional Network Management Data HostNetwork PSTNConsole Project 25 RFSS Project 25 RFSS Fixed/Base Station Trunked or Conventional Fixed/Base Station Trunked O
44、nly G (ISSI) E E E E Et c d n fUm Um Um Um2 Um Um Direct Mode between Subscriber Units Direct Mode between Subscriber Units New P25 Interface Phase 2 Two-Slot TDMA CAI (Um2) A A A A A A Figure 1 Representative P25 Phase 2 System Model Illustrating Support of the New Phase 2 Two-Slot TDMA CAI (Um2) a
45、nd the Phase 1 12.5 kHz FDMA CAI (Um) This document is organized as follows. Clause 1 introduces the standard. Clause 2 describes the scope of the standard and provides supporting TIA-102.BBAB 2 information (i.e., overview, revision history, references, and glossary). Clauses 3, 4, and 5 specify, re
46、spectively, the transmission format, modulation scheme, and structure of the different types of bursts for the P25 Two-Slot TDMA Physical Layer CAI Protocol Specification defined by the standard. An informative annex provides information on H-D8PSK modulation. TIA-102.BBAB 3 2. Scope The scope of th
47、e P25 Phase 2 Two-Slot TDMA Standard, which includes this standard (see 3), has been established taking into account the P25 Phase 2 6.25 kHz CAI requirements defined in 4. In this regard, the P25 Phase 2 Two-Slot TDMA Standard defines an additional type of P25 CAI interface, the Phase 2 Two-Slot TD
48、MA CAI, which is shown as Um2 in Figure 1. (See 3 and 4 for background information concerning the Phase 1 and Phase 2 P25 interfaces shown in Figure 1.) The Um2 interface is the P25-standardized CAI that supports P25 trunked voice and data service between P25 fixed/base station equipment provided as
49、 part of a trunked P25 Radio-Frequency Subsystem (RFSS) and P25 Subscriber Units (SUs) implementing the P25 Two-Slot TDMA Standard. The OSI Layers 1, 2, and 3 are the specified scope of the standardization of the Um2 interface. This standard defines OSI Layer 1 for the Um2 interface. This standard has been developed taking into account that SUs implementing the P25 Phase 1 Standard (using the P25 Phase 1 CAI, Um, shown in Figure 1) for trunked voice and data service be supported by P25 RFSSs that implement the P25 Phase 2 Two-Slot Standard (using the P25 Phase 2 Two-Slot T
