GA/T 444-2003 General Technical Specification for Public Security Digital Trunked Mobile Communication System
Some standard content:
Appendix A and Appendix B of this standard are normative appendices. This standard is proposed by the Information and Communication Bureau of the Ministry of Public Security. Foreword
This standard is under the jurisdiction of the Communication Standardization Technical Committee of the Ministry of Public Security. This standard was jointly drafted by the First Research Institute of the Ministry of Public Security and the Information and Communication Bureau of the Ministry of Public Security. The main drafters of this standard are: Yu Delin, Zhang Junye, Ji Yaping, Li Yongxiang, Qian Zhihong, Han Lin, Li Jiang, Liu Daojun. GA/T444---2003
GA/T444—2003
Although there is an electronic industry standard SJ/T11228-2000 "Digital Trunk Mobile Communication System System" issued by the Ministry of Information Industry in China, it is formulated for digital trunk mobile communication systems working in the 800MHz frequency band allocated by the State Radio Management Committee. This frequency band is a frequency band that all government agencies can apply for or use to build a trunked common network. The frequency bands allocated by the State Radio Administration Committee for mobile communications of public security, armed police, justice, procuratorial organs and other agencies are 350MHz and 380MHz. The public security digital trunked mobile communication system is a system operating in the 350MHz frequency band. This standard is formulated to standardize the technical system of the construction of digital trunked mobile communication systems by public security agencies so as to smoothly realize the interoperability and networking between systems composed of equipment provided by different suppliers. The international standard corresponding to this standard is the TETRA communication series standard EN300392 proposed by the European Telecommunications Standards Institute (ETSI), one of the digital trunked mobile communication system standards recommended by the International Telecommunication Union. The relevant parts of this series of standards are selected and listed in this standard, such as the basic technical system, interfaces at all levels, user functions, etc., and some contents are added and modified according to the characteristics and actual needs of my country's public security mobile communication business, mainly: system main parameters, working frequency bands, numbering plan, AC power supply, system safety, environmental conditions and reliability requirements.
1 Scope
Public security digital trunking mobile communication system
General technical specifications
GA/T 444—2003
This standard specifies the technical characteristics, system configuration equipment and functional requirements, working frequency band and channel configuration, numbering plan, network composition, basic performance indicators of channel equipment, AC power supply system, information security and confidentiality, environment and electromagnetic compatibility, reliability and other general requirements of the public security digital trunking mobile communication system.
This standard applies to the overall planning, network system design, system equipment development, production, engineering construction and quality control of the public security digital trunking mobile communication system.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T6113.21998 Methods of measuring radio interference and immunity (eqVC1SPR16-2:1996) GB/T7611--2001 Electrical interface characteristics of digital network serial bit rate GB9254--1998 Limits and methods of measurement of radio interference of information technology equipment (idtCISPR22:1997) GB/T13426--1992 Reliability requirements and test methods for digital communication equipment GB/T13722--1992 Technical requirements and test methods for mobile communication power supply GB/T14013--1992 Transport packaging for mobile communication equipment (neqMILFTD-STD.102B) GB/T14394--1993 Management of reliability and maintainability of computer software GB15540--1995 Technical requirements and methods of measurement for electromagnetic compatibility of land mobile communication equipment GB/T1 5542--1995 Technical requirements for mathematical program-controlled automatic telephone exchanges GB/Z15629.1-2000 Information technology - Telecommunications and information exchange between systems - Specific requirements for local area networks and metropolitan area networks - Part 1: Overview of local area network standards (idtIS0/IECTR8802-1:1997) GB/T15629.2-1995 Information processing system local area network - Part 2: Logical link control (idtISO8802-2:1989) GB/T15629.3-1995 Information processing system local area network - Part 3: Access method and physical layer specification of carrier sense multiple access with collision detection (CSMA/CD) (idtISO/IEC8802-3:1990) GB/T15629.4-1997 Information processing system local area network - Part 4: Token passing bus access method and physical layer specification (idtISO/IEC8802-3:1990) ISO/IEC 8802-4: 1990)
GB/T15629.5—1996 Information technology Local area networks and metropolitan area networks Part 5: Token ring access method and physical layer specifications (idt ISO/IEC 8802-5:1992)
GB15842-1995 Safety requirements and test methods for mobile communication equipment GB/T15844.2—1995 Environmental requirements and test methods for mobile communication FM radio telephones GB/T15844.3--1995 Reliability requirements and test methods for mobile communication FM radio telephones GB/T15844.4—1995
Quality assessment rules for mobile communication FM radio telephones GB/T17618-1998 Immunity limits and measurement methods for information technology equipment (idtCISPR24:1997) GB/T17626.2-1998 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test (idtIEC61000-4-2:1995)
GA/T 444—2003
3 Automatic level specification for police mobile communication network GA 176--1998
SJ/T11228—2000 Digital trunked mobile communication system system CCITT/ITUE.212 International Mobile Subscriber Numbering Plan EN300392-1 Terrestrial trunked radio Voice + data communications Part 1 Network design Voice + data communications Part 2 Air interface Terrestrial trunked radio
EN 300 392-2
Voice + data communications Part 5 Peripheral interface EN 300 392-5
Terrestrial trunked radio
EN 300 392-7
EN 300 394-1
Voice and data communications Part 7 Security
Terrestrial trunked radio
Terrestrial trunked radio
Conformance characteristics Part 1 Radio equipment testing Full-rate traffic channel voice coding Part 2 TETRA voice coding Terrestrial trunked radio
ETS 300 395-2
ETS 300 396-1
Terrestrial trunked radio
Direct-through operation Part 1 Network design
Direct-through operation Part 2 Air interface
ETS 300 396-2Terrestrial trunked radio
3 Terms, definitions and abbreviations
The following terms, definitions and abbreviations apply to this standard. 3.1 Terms and definitions
Network infrastructure switching and management infrastructare (SwMI) All equipment of a digital trunked system except user equipment. 3.1.2
physical channel
physical channel
is the radio frequency carrier and time slot number (TN) of the digital trunking communication system. 3.1.3
logical channel
logical channel
refers to the control logic channel and voice and data logic channels allocated on the physical channel for transmitting various control signaling and voice or data services according to the communication needs of the trunking mobile network. 3. 1. 4
basic linkbasic link
a two-way connectionless path between one or several mobile stations and a base station, providing confirmation and non-confirmation services based on a single message. 3.1.5
↑ assigned channel
Assigned channel
Channel assigned by the network infrastructure to certain mobile stations using channel assignment commands. Assigned channels can be assigned for secondary control or circuit mode calls.
Common control channelsControl channels sent by the network infrastructure to control mobile stations. Common control channels consist of the primary control channel (MCCH) and the common secondary control channel (SCCH).
Main control channelmain control channel (MCCH)The main common control channel used by the network infrastructure to control the transmission of mobile stations in the cell. The main carrier frequency in the cell is broadcast by the network infrastructure and the main control channel is located in the first time slot of the main carrier. 3.1.8
secondary control channel (SCCH)Secondary control channel
A non-primary control channel (MCCH). There are two types of secondary control channels (SCCH): general secondary control channel, which has the same function as the primary control channel but is only used for mobile stations in a subsequence; GA/T444--2003
assigned secondary control channel, which can be assigned to certain mobile stations for use after random access or paging information is initiated. 3.1.9
associated control channel (ACCH) A dedicated signaling channel that works in conjunction with a channel that has been designated for circuit mode transmission. When there is no transmission in a known direction, the channel consists of the fast coordinated control channel 1 (FACCH) using frames 1 to 18, or when there is transmission in a known direction, the channel consists of the slow coordinated control channel (SACCH) in frame 18 that is always available for use. 3.1.10
Stealing channel (STCH) A stealing channel is a channel associated with a traffic channel (TCH), that is, a channel that temporarily "steals" part of the capacity of the associated TCH to send control information. It can be used when fast signaling is required. When using half-duplex mode, the stolen channel is unidirectional and has the same direction as the associated TCH.
Trunked mode operation A mode of operation in which mobile stations communicate under the control of the network infrastructure. 3.1.12
Direct mode operation (DMO) A mode in which mobile user units can use radio frequency to communicate in a simplex mode without any intervention of base stations, under the condition that they are not controlled by the trunking network but can be monitored by it. There are three direct modes: a) mobile stations communicate directly with each other;
b) mobile stations communicate with each other through a direct relay station; c) mobile stations communicate with each other through a trunking gateway and the network. 3.1.13
Half duplex operation half duplex operation A working mode in which each mobile station or wired station needs to request permission to transmit before each transmission. When working in cluster mode, half-duplex is dual-frequency simplex.
Dual watch mobile station (DW-MS) is a mobile station that can work in direct mode and cluster mode. At a given moment, the mobile station can only choose one mode to work. But when it works in direct mode, it can monitor the cluster control channel, and when it works in cluster mode, it can monitor the direct communication channel. 3.1.15
Voice + data mode V+D mode operation A working mode in which communication is carried out through a voice and data air interface controlled by the network infrastructure. 3.1.16
Normal mode normal mode
The working mode in which the main control channel is in the first time slot of frames 1 to 18. 3.1.17
minimum modeminimummode
The working mode in which the network infrastructure allocates 4 time slots of the main carrier for transmission or control. When using this mode, only the 18th time slot can be used for general control without interfering with established services. 3.1.18
roaming
refers to the operation of a user with a legal registration code (ITSI) on a GA/T network with a different mobile country code (MMC) and/or mobile network code (MNC). 444—2003
The action of changing the location area within the network.
Migration
refers to the action of a user without a registration code (ITSI) changing to a new location area within a network with a different mobile country code (MMC) and/or mobile network code (MNC). 3.1.20
Handover
Handover refers to the process when a mobile station switches from one radio channel to another during a call, and the communication should not be interrupted during this process. Handover can be divided into intra-cell handover, inter-cell handover within the same base station controller (BSC), inter-cell handover between different BSCs within the same mobile service switching center (MSC), and inter-MSC cell handover. 3.1.21
Call setup time
Call setup time
refers to the time from the last moment when the transmitter completes the transmission of the call application command to the last moment when the receiver completes the reception of the channel allocation command.
Time division multiple access (TDMA) frame number The set time of a TDMA frame within a multiple frame. 3.1.23
Dialing, numbering & addressing The process of exchanging identification codes between users and terminals is called dialing. The air interface address is represented by a user-visible decimal number and is called numbering. The process of exchanging identification codes through the air interface is called addressing, or addressing for short. 3.2 Abbreviations
AACHAccess Assignment ChannelACCHAssociated Control ChannelACELPAlgebraic Code-Excited Linear PredictiveBCCH Broadcast Control ChannelBLCH Base Station Linearization ChannelBNCH Broadcast Network ChannelBSBase Station
BSCH Broadcast Synchronization Channel
CBControl uplink BurstCC Call Control
CCHControl Channel
CLCHCommon Linearization ChannelCMCECircuitModeControlEntityCONPConnection Oriented Network ProtocolDMODirectModeOperationDQPSK Differential Quaternary Phase Shift KeyingETS European Telecommunication StandardETR ETSI Technical Report ETSI European Telecommunication Standard Institute GSSI Group Short Subscriber Identity ISSI Individual Short Subscriber Identity 4
GA/T 444—2003
ITU-R International Telecommunication Union-Radiocommunication Sector International Telecommunication Union-Radiocommunication Sector
LCHLinearization Channel MAC Medium Access Control MCCH Main Control Channel MLE Mobile Link Entity MM Mobility Management PC Protocol Control PDCH Packet Data Channel PDN Packet Data Network PDP Packet Data Protocol PDU Protocol Data Unit PLPhysical Layer
PTNPrivate Telephonic Network SAP Service Access Point SCCH Secondary Control Channel SCHSignalling ChannelSCLNPSpecific ConnectionLessNetworkProtocolSpecific Connectionless Network ProtocolSDS Short Data ServiceSS Supplementary ServiceSTCHStealing ChannelSwitching and Management InfrastructureSwMI
TCHTraffic ChannelwwW.bzxz.Net
TDMATimeDivision Multiple AccessTime Division Multiple AccessNetwork Infrastructure
TETRA Terrestrial Trunked RadioTMITETRAManagement IdentityTETRA Management IdentityTPTraffic Physical ChannelUL UpLink
4 General
This standard is based on the TETRA series of standards (i.e. EN300392, ETS300396, etc. proposed by ETSI), one of the digital trunked mobile communication standards recommended by ITU-R, and is formulated with reference to SJ/T11228-2000 System A. It is a digital trunked mobile communication standard working in the 350MHz frequency band. All parts not specified or involved in this standard shall comply with the TETRA series standards. 5 System Technical Characteristics
5.1 Basic Technical Characteristics
5.1.1 Technical System
5.1.1.1 Channel Division
Channels are divided by frequency and time division. Frequency division is to divide the carrier channels according to 25kHz channel spacing and 10MHz dual-frequency spacing within a given 350MHz frequency band. Time division is to divide the time slot channels by time division multiplexing/time division multiple access (TDMA) technology. It is stipulated that the number of time slots per carrier is 4, that is, the number of physical channels is 4, and then the business and control logic channels are set according to needs. 5.1.1.2 Regional coverage
For the coverage of wireless service area, the following technologies are adopted:5
GA/T 444—2003
a) Single base station large area coverage;
b) Cellular frequency reuse;
c) Quasi-synchronous transmission;
d) Time-sharing transmission;
e) Antenna diversity;
f) Base station diversity;
g) Direct mode of communication (DMO)/cluster gateway. 5.1.2 Voice coding technology
Voice coding adopts algebraic code excited linear prediction coding (ACELP) technology. 30ms voice frame should be used, and the bit rate of each frame is 4,567bit/s. See Section 5 of ETS300395-2. 5.1.3 RF modulation method
The RF modulation method adopts differential quadrature phase shift keying (DQPSK) with a phase shift of y/4. 5.1.4 Carrier modulation rate
The carrier modulation rate should be 36kbit/s.
5.1.5 Call establishment time
In the same exchange, the group call establishment time should not exceed 300ms. 5.2 Basic system services
5.2.1 User terminal services
User terminal services are services that provide complete communication capabilities between user terminals. This system should provide the following user terminal services: a) Dispatch voice services;
b) Telephone interconnection services.
5.2.2 Bearer services
Bearer services are telecommunications services that provide signal transmission capabilities between user terminals and network interfaces. This system shall provide the following bearer services:
a) circuit voice and data transmission;
b) short data transmission;
c) packet data transmission.
5.3 Basic protocols and signaling
The basic protocols and signaling adopt the relevant protocols and signaling in the EN300392 series of standards and the ETS300396 series of standards. 5.4 System working mode
5.4.1 Cluster working mode
The working mode in which mobile terminals can communicate through the voice-data air interface controlled by the cluster switching and management infrastructure (SwMI).
Business channel full busy processing: When the business channels are all busy, the main control channels are used as business channels. 5.4.2 Direct working mode
The system supports the direct working mode between groups and the direct working mode between mobile users through the relay station. 5.4.3 Fault mitigation working mode
When the link between the base station and the switching node fails, the base station can still continue to work in a cluster mode to support the basic call services of the base station (single call, group call, etc.).
When a transmitter and a receiver fail, they are turned off, and the other transmitters and receivers work as usual; when a receiver is interfered with, it is turned off, and the other receivers work as usual. Once the interference disappears, it will automatically resume normal operation. 5.5 Synchronization performance requirements
5.5.1 Base station requirements for synchronization
GA/T 444—2003
All base station RF generation and clock frequencies should use a frequency source, and the accuracy of the frequency source should be better than ±0.2×10-°. The timing difference between different carriers should be less than the symbol width. When different base stations use the same carrier frequency in time-sharing, the difference between the reference time bases of any two base stations should be less than the symbol width. 5.5.2 Requirements for synchronization of mobile stations
The mobile station is synchronized with the signal transmitted by the base station on the BSCH. The mobile station sends a signal to the base station only when the following synchronization requirements are met:
The accuracy of the carrier frequency of the mobile station compared with the signal received from the base station should be within ±100Hz; a)
b) The mobile station should adjust the internal time base to keep it consistent with the time base of the received signal, the time difference should be less than the code element width, and the adjustment time should be within 1s to 3s;
c) When determining the timing signal from the base station, the timing estimation error should be less than 1/8 code element width. 6 System components and functional requirements
6.1 System components
6.1.1 Network infrastructure
The network infrastructure includes network switches, network management equipment, gateways, base station control equipment and base stations. 6.1.2 User terminal equipment
User equipment includes mobile stations and wired stations, which are equipment used by users. 6.1.2.1 Wired station
is a user terminal device connected to the network infrastructure by wire. 6.1.2.2 Wireless station
refers to a user terminal device composed of a wireless transmitter, a receiver and a corresponding control unit, which is connected to the network infrastructure by wireless means. Including mobile stations and fixed stations.
a) Fixed station
A wireless station used in a fixed state is a fixed station; b) Mobile station
A wireless station used in a mobile state is a mobile station, which can be classified in different ways: 1) Two types of mobile stations divided by communication services: · Voice terminal: composed of a mobile terminal unit and a terminal equipment unit, providing user terminal services and bearer services; · Data terminal: only contains a mobile terminal unit, providing data bearer services. 2) Two types of mobile stations divided by working mode: · Cluster mobile station: a mobile station that can only work in cluster mode; · Dual-mode mobile station: a mobile station that can work in both cluster mode and direct mode; among them, a mobile station that can simultaneously monitor cluster mode and direct mode is also called a dual-duty mobile station. 6.1.2.3 Dispatching station
Includes wired dispatching station and wireless dispatching station. a) Wired dispatching station
A wired station with dispatching function is a wired dispatching station. b) Wireless dispatching station
A wireless station with dispatching function is a wireless dispatching station. 6.2 Main functions of the system
6.2.1 Network infrastructure functions
GA/T 444—2003
6. 2. 1. 1
Basic functions
a) System call function
Single call: a call to a single user;
·Group call: a call to a group of users; All call (system call): a call to all users in the system;·Broadcast call: a one-way call to all users in the system;·Emergency call: equivalent to preemption priority, that is, in an emergency situation when the system is busy, the user with preemption priority can disconnect the communication of the user with the lowest priority and continue its connection process, thereby realizing the call;: Priority call: the system assigns priority to the user station, and the priority should include at least 8 levels;·Call transfer: the system transfers the call to another user station or wired telephone;·Unconditional call transfer: allows the user station to transfer all calls;·Call transfer when busy: transfer the call when the user station is busy;·User cannot call transfer in time: transfer the call when the user station is turned off or out of the service area;·No answer call transfer: transfer the call when the called user does not answer. ·Inclusive call: a third party can be called to add a person when two parties are communicating; ·Short data call;
·Dispatcher check call: before the call is allowed, the dispatcher will check the legitimacy of the call request; Wired/wireless interconnected call: a mobile station can call a wired telephone user, and vice versa; System dispatch control function
Dispatcher area selection: the dispatcher's work area can be selected; ·Call time limit function: the mobile station's call time can be limited; ·Dynamic reorganization: the dispatcher is allowed to regroup users by wireless means; Late entry: during a group call, late members can join an ongoing group call; ·
·Remote kill/resurrection: the system uses wireless means to disable/revalidate the function of a mobile station user; ·Calls to busy users: when calling a busy user, the system allows the caller to wait until the busy user becomes idle before exiting;
·Calls to unanswered users: when the call is not answered, the system allows the caller to exit after the caller exits Wait until the called user answers before calling out;
·Call capacity limitation: limit the calling/outgoing call capacity according to the list set by the user;·Busy queuing: when the system is busy, the calling user automatically queues according to the priority level;●Monitoring: a user station can be authorized to monitor one or more users;Environmental monitoring: the dispatch station remotely turns on the transmitter of a called user station, so that the sound around the user station can be monitored, but the user station does not have any transmission instructions, and does not prevent the mobile station from sending or receiving calls as usual during the environmental monitoring period;
·Forced disconnection: allow the dispatch station and authorized users to disconnect the ongoing user call;·Forced insertion: allow the dispatch station and authorized users to insert into the ongoing call;c) System networking function
·Single switching center multi-base station networking system can realize cross-base station roaming;·Multi-switching center networking system can realize cross-network roaming;·The system should allow the establishment of virtual networks and the setting of their own dispatch stations;·The system should have expansion capabilities and compatibility. 6.2.1.2 Management functions
·Real-time modification of system parameters;
·Priority setting;
GA/T 444—2003
, real-time system status display and monitoring: including queue number, channel occupancy, user call status, wired telephone number, voice and data services, etc.;
·Traffic statistics and billing;
·System self-diagnosis;
·Fault mitigation;
·Fault reporting.
Main user terminal functions
Mobile station functions
Basic call functions: single call, group call;
Participating group and dynamic group numbers can be set, at least 8 options; keep and switch the current group (the definitions of participating group, dynamic group and current group are shown in 4.2~4.4 of GA176-1998); can support duplex single call and wired and wireless interconnection; system full call;
Call dispatch console;
Emergency call;
Call transfer;
Unconditional call transfer;
Call transfer when busy;
User does not transfer the call in time;
No Answer transfer call;
Short data call;
Automatic registration of roaming network;
Manual selection of base station network;
Manual or automatic switching of trunking/direct mode; Automatic retransmission;
Queue status prompt;
Alarm;
Abbreviated dialing;
Out of service area indication;
Call display calling number/called number;
Call prompt: Display the calling party number of other callers on the busy user station; Speaker identification display: The user station displays the speaker number in the group call; Group call control transfer: The initiator of the group call can transfer his control to another party. 6.2.2.2
Function of the dispatch station
The dispatch station referred to here includes wired dispatch station and wireless dispatch station. Its basic functions are as follows: a)
single call, group call, all call;
inclusive call;
transfer call;
broadcast call;
status call;
short data call;
monitoring, barging, forced demolition;
GA/T 444--2003
h) dynamic reorganization;
i) remote killing and resurrection;
j) alarm acceptance;
k) voice prompt;
1) event recording;
m) real-time status display.
6.3 Other requirements
6.3.1 Chinese localization requirements
The system management terminal and user terminal should be able to provide Chinese operation and display interface. 6.3.2 Other requirements for mobile stations
a) With trunking and direct dual-mode working capabilities; b) Use the knob to select the talk group (no less than 16 talk groups); c) With 5-level ring volume control;
Real controllable screen backlighting;
With 5-level field strength indication;
f) The handheld station has a vibration prompt for receiving messages;
g) The handheld station should have a battery power indicator;
h) The battery capacity of the handheld station ensures that the working time is not less than 8 hours under the following conditions: After the battery is normally charged, the transmitter works at the nominal power (the highest power level given by the machine), the receiver works at the rated audio output power, and works in a 1:1:8 (transmit/receive/wait) working cycle.
7 Working frequency band and channel configuration
This section specifies the working frequency band, physical channel and logical channel configuration of the public security digital trunked mobile communication system. 7.1 Working frequency band
The carrier working frequency band of the public security digital trunked mobile communication system is the 350MHz frequency band allocated to the public security department by the national frequency management department, with a total of 5MHz dual-frequency, i.e. from 351.025/361.025MHz to 356.000/366.000MHz, and 3MHz single-frequency, i.e. 358.025MHz~～361.000 MHz.
7.2 Physical channel configuration
7.2.1 Carrier frequency configuration
This subsection specifies the carrier frequency channel configuration of the 350MHz frequency band digital trunked mobile communication system. 7.2.1.1 Dual-frequency channel structure
a) Dual-frequency interval
According to the given bandwidth, the dual-frequency interval can only be set to 10MHz. b) Fixed configuration of high and low frequencies of dual-frequency channels 1) The high frequency of the dual-frequency channel is configured for base station transmission and mobile station reception; 2) The low frequency of the dual-frequency channel is configured for mobile station transmission and base station reception. c) Channel spacing
The minimum channel spacing is 25kHz.
7.2.1.2 Channel grouping scheme
a) Carrier channel grouping principles
1) There is no third-order intermodulation configuration in the same group;
2) Specified channel spacing and dual-frequency spacing. b) Carrier frequency grouping scheme
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