1 Scope
This Standard specifies technical specifications for physical layer and data link layer of air interface of police digital trunking communication system, including overall protocol architecture, air interface definition, protocol data unit description, data protocol, application and service.
This Standard is applicable to design, manufacture and acceptance of police digital trunking communication system.
2 Normative References
The following documents are indispensable for the application of this Standard. For dated references, only the dated edition is applicable to this document. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
GA/T 1056-2013 Police Digital Trunking Communication System-General Technical Specifications
GA/T 1058-2013 Police Digital Trunking Communication System-Technical Specifications for Call Control Layer of Air Interface
GA/T 1059-2013 Police Digital Trunking Communication System-Security Technical Specifications
3 Terminologies, Definitions and Abbreviations
3.1 Terminologies and Definitions
For the purposes of this document, the terminologies and definitions defined in GA/T 1056-2013 and the following ones apply.
3.1.1
Forward channel
The channel from call initiator to receiver in direct mode.
3.1.2
Backward channel
The channel from call receiver to initiator in direct mode.
3.1.3
1:1 mode
The mode of one service occupying one carrier wave.
3.1.4
2:1 mode
Foreword i
Introduction ii
1 Scope
2 Normative References
3 Terminologies, Definitions and Abbreviations
3.1 Terminologies and Definitions
3.2 Abbreviations
4 Overview
4.1 Protocol Architecture
4.2 TDMA Block Structure
4.3 Timing Reference
4.4 Basic Channel Type
5 Physical Layer
5.1 Common Parameters
5.2 Modulation
6 Data Link Layer Protocol Description
6.1 Data Link Layer Timing
6.2 Channel Access
7 Burst Format of Data Link Layer
7.1 General
7.2 Voice Burst
7.3 Data and Control
7.4 Common Announcement Channel Burst
7.5 Reverse Channel Burst
8 Control Signalling Format of Data Link Layer
8.1 Link Control Block Structure
8.2 Control Signalling Block Message Structure
8.3 Idle Message Structure
8.4 Multiblock Control Message Structure
8.5 End to End Voice Encryption Control Block Structure
9 Packet Data Protocol of Data Link Layer
9.1 Data Fragmentation and Reconstitution
9.2 Data Header Block Structure
9.3 Structure of Data Block
10 Protocol Data Unit
10.1 Voice, Universal Data and Common Announcement Channel PDU
10.2 Data-related PDU Definition
10.3 Data Link Layer Information Element Coding
Appendix A
(Normative) Definition of Timer
Appendix B
(Normative) Constant Definition
Appendix C
(Normative) FEC and CRC Coding
Appendix D
(Normative) Definitions of Idle Message and Null Value Filling Embedded Message
