Standard No.:	GA/T 1057-2013
English Name:	Police digital trunking communication system—Technical specifications for physical layer and data link layer of air interface
Chinese Name:	警用数字集群(PDT)通信系统 空中接口物理层及数据链路层技术规范
Chinese Classification:	A90    Social and public safety in general
Professional Classification:	GA    Professional Standard - Security
ICS Classification:	33.060.01 33.060.01    Radiocommunications in general 33.060.01
Issued by:	MPS
Issued on:	2013-3-20
Implemented on:	2013-3-20
Status:	valid
Language:	English
File Format:	PDF
Word Count:	32000 words
Price(USD):	600.0
Delivery:	via email in 1 business day

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