GB 15539-1995 Technical framework for trunked mobile communication systems
Some standard content:
National Standard of the People's Republic of China
Technical specifications for trunked mobile radio systems1Subject content and applicable scope
GB15539—1995
This standard specifies the technical system of trunked mobile radio systems in the 800MHz frequency band. It mainly includes network structure, frequency configuration, main performance indicators and functions, numbering method, control channel configuration method, signaling, general technical requirements for wireless equipment and interfaces. This standard provides a technical basis for the planning, design, development, production, use and networking management of trunked mobile radio systems. 2 Reference standards
GB3376 Signaling method for single-frequency pulse lines in band of automatic telephone exchange networkGB 3377
GB 3378
GB 3379
GB3380
GB3384
Signaling method for multi-frequency recorders in automatic telephone exchange networkUser signaling method in automatic telephone exchange network
DC signaling method for automatic telephone exchange networkInter-office relay digital line signaling method for automatic telephone exchange network
Network interface parameters for analog carrier communication systemGB3971.2 Signaling method for digital line of automatic telephone exchange networkInter-office relay GB6280
GB 6282
Capacity series and channel configuration of 25～1000MHz land mobile communication networkInterface parameters for 25～1000MHz land mobile communication network accessing public communication network through user lineGB 7611
Pulse Code Modulation Communication System Network Digital Interface Parameters 3 Terminology
3.1 Trunked Mobile Systems (abbreviated as trunked systems) A mobile communication system in which multiple departments or units share a group of dynamically allocated wireless channels. It is mainly used for dispatching communications. 3.2 Repeater
Refers to the wireless transceiver used for forwarding in the base station of the trunked system. 3.3 Mobile Station
A user station that is in motion or parked at an undetermined location for communication. It includes vehicle-mounted stations, portable stations and handheld stations. 3.4 Dispatch Station
Equipment for commanding, dispatching and managing mobile stations. It is divided into wired and wireless dispatch stations. 3.5 Control Centre
The control centre includes equipment such as system controller and system management terminal. It mainly controls and manages the operation, switching and connection of the entire trunked system.
3.6 Range of base station coverage The area covered by a base station,
Approved by the State Administration of Technical Supervision on April 6, 1995 and implemented on December 1, 1995
4 Network structure and equipment composition of trunking communication network GB15539--1995
4.1 The network structure of single control center and single base station is shown in Figure 1. It consists of a control center, a base station, a wired or wireless dispatch station and several mobile stations.
A control center and a base station are set up in the entire service area. The base station and the control center can be located in the same place or separated. Both can be connected through wired or wireless transmission circuits. The control center can be connected to the user switch or the local telephone terminal through user lines or trunk lines. The wired dispatch station is directly connected to the control center through wired transmission lines. In order to expand the signal range of the handheld station, multiple receiving stations can be added at different locations in the base station area. They can be connected to the control center through wired or wireless transmission circuits and controlled by the control center. The same frequency relay forwarding station can also be used. 4.2 Regional network structure
The regional network structure is shown in Figure 2. It consists of a regional control center and multiple single control centers and single base stations. The entire service area is equipped with a regional control center and multiple single control centers and single base stations, and multiple base station areas (adjacent base station areas are not necessarily covered continuously) form the entire service area. The network structure of a single control center and a single base station is the same as that in Article 4.1. Each control center is connected to the regional control center through a wired or wireless transmission circuit and is controlled and managed by the regional control center. The single control center mainly handles the services of mobile users within the base station area and those crossing to the base station area. The regional control center mainly handles the registration of cross-zone user identification codes, control channel allocation, and the services of wired or wireless users looking for cross-zone users, that is, location registration, and cross-zone search channel roaming services, thus forming a multi-zone network with two-level management. 4.3 Equipment maintenance of the trunking communication network
a. Mobile stations
include vehicle-mounted stations, portable stations, and handheld stations, which are composed of transceivers, control units, antenna feed lines, (or duplexers), and power supplies. n. The dispatching station
includes two types of wired and wireless dispatching stations. The wireless dispatching station consists of a transceiver, a control unit, an antenna feed line (or a duplexer), a power supply and an operating console. In addition to the operating console, the wired dispatching station also includes interface equipment with the control center. c. The base station
is composed of several repeaters, antenna feed line systems and power supplies. The antenna feed line system includes a receiving antenna, a transmitting antenna, a feed line and an antenna duplexer. The antenna duplexer includes a transmitting combiner and a receiving multiplexer. d. The control center
The control center includes equipment such as a system controller, a system management terminal and a power supply. It consists of a wireless interface circuit, a switching array, a cluster control logic circuit, a wired interface circuit, a monitoring system, a power supply and a monitor. e. Regional control center
The equipment in the regional control center is mainly a multi-zone controller. 5 Frequency configuration of the cluster communication network
The operating frequency band is 806~821MHz (mobile station transmits, base station receives). 851~866MHz (base station transmits, mobile station receives). For specific configuration, please refer to Appendix A (supplement).
Connect to user switch
or city telephone network
Control center
Wired dispatch station
Receiving station 1
GB15539—1995Www.bzxZ.net
Car-mounted station
Handheld station
Receiving station 2
Portable station
Receiving station N
Wireless dispatch station
Connect to user switch or city telephone network
Connect to wired dispatch station
District control center
6 Main performance indicators of trunking communication network
6.1 Types of services
Mainly for calls, data information can also be transmitted. 6.2 Capacity within each base station area
a. The number of channels is 5 to 20;
Single control center, single base station network structure diagram Control center
Control center
Control center
Control center
Figure 2 Regional network structure diagram
Same frequency forwarding station
Car-mounted station
Handheld station
Portable station
Wireless dispatch station
Car-mounted station
Handheld station
Portable station
Wireless dispatch station
b. For the trunking dispatching system, there are at least 70 mobile stations per channel. For the trunking system connected to the user exchange or the local telephone terminal, the number of mobile stations per channel should be appropriately reduced according to the traffic volume and the actual operation of the network. 6.3 Voice transmission quality indicators
6.3.1 Voice transmission quality indicators in wireless dispatch network81
GB15539-1995
a. Method of expressing voice transmission quality: Voice transmission quality in dispatch network is expressed by signal-to-noise ratio [(signal + noise)/noise] in audio band.
When a mobile user talks with a wired dispatch console, the signal-to-noise ratio in audio band of dispatch network is greater than or equal to 20dB (standard test tone test).
6.3.2 Voice transmission quality indicators for access to local telephone networka. Method of expressing voice transmission quality: Same as 6.3.1a; b. When a mobile user talks with a local telephone user, the signal-to-noise ratio in audio band from mobile user to the audio output terminal of control center is 25-29 dB (standard test tone test).
6.4 Queuing standard
The probability of waiting time exceeding 15s should be less than 0.3.6:5 Transmission loss in the dispatching network
The transmission loss between the mobile user and the audio output terminal of the control center should be less than or equal to 4.5dB. The transmission loss between the mobile user and the local telephone exchange should be less than or equal to 7dB.
6.6 Wireless accessibility at the edge of the coverage area
For urban areas, near-efficiency areas and high-density user areas, the wireless accessibility at the edge of the dispatching network coverage area is required to be no less than 90%. For rural areas, mountainous areas and low-density user areas, the wireless accessibility at the edge of the dispatching network coverage area can be designed according to local actual conditions, but the minimum shall not be less than 50%.
6.7 Same-channel interference protection ratio
The same-channel interference protection ratio at the receiver RF input end should be greater than or equal to 8dB7 Main functions of trunking communication network
7.1 Wireless working mode
Dual-frequency simplex (mobile user → mobile user, wireless dispatch station); a.
b. Dual-frequency simplex or dual-frequency duplex (mobile user → wired dispatch station); c. Dual-frequency simplex or dual-frequency duplex (mobile user-user switch user); d. Dual-frequency duplex (mobile user-local telephone user). 7.2 Dispatch function
7.2.1 Call types
There are single calls, group calls (department, large group and small group), system full calls and local telephone calls. 7.2.2 Busy queue/automatic call back
When all channels are busy, users who request calls will queue up and wait according to their priority. When there is an idle channel, the control center will automatically call back and connect the waiting users in the queue in the order of queue. 7.2.3 Automatic retransmission
After the calling mobile user presses the call send button, if it is not confirmed by the control center, the mobile station can repeat the call request several times. 7.2.4 Priority level
Mobile users have priority levels. It can be divided into several levels, and emergency calls have the highest priority. 7.2.5 Emergency call
When the mobile user presses the emergency call button, the system management terminal displays the identification code of the emergency call user and makes a sound to remind the administrator. The system gives priority to allocating channels to the mobile station that makes the emergency call. 7.2.6 Time-limited call
To ensure the effective use of channels and shorten waiting time, calls should have time limits. The typical value of the wireless dispatch call duration is 15s, and the maximum time-limited call duration shall not exceed 1min. When a mobile user talks to a local telephone user, the maximum time-limited call duration shall not exceed 10min. The time-limited parameters can be adjusted by the system administrator.
GB15539—1995
7.2.7 The mobile station should have the ability to automatically search for control channels. 7.2.8 Coverage Exceeding Indication
When the received signal of the mobile station is lower than a certain value, the mobile station uses light or sound to indicate that the station has exceeded the coverage area. 7.2.9 Optional Functions
a. Dynamic Reorganization
According to business needs, some users in different groups can be reorganized into a temporary group to communicate together. b. Priority for New Users
When the call is busy, the user who has just occupied the voice channel has priority over other users of the same priority level to use the voice channel. c. Misdirection Prevention
On the assigned voice channel, the repeater sends a string of identification codes of the user using the channel. The mobile station that mistakenly occupies the channel will automatically return to the control channel because it cannot receive the identification code of the station. d. Continuous Channel Assignment Update
The control channel continuously sends out voice channel assignment information and the identification code of the user occupying the voice channel, so that the user who has just turned on the phone and entered the coverage area can join the system operation.
e. When all voice channels are busy, the control channel can be used as a call channel. f. Fault mitigation
The system controller fails, the mobile station is assigned to operate on the predetermined channel, and the base station continues to communicate in the normal forwarding mode. 7.3 Connection mode
7.3.1 Automatic connection from wired or wireless dispatch station to mobile user or mobile user group. 7.3.2 Automatic connection from mobile user to wired or wireless dispatch station. 7.3.3 Automatic connection from mobile user to mobile user or mobile user group. 7.3.4 Automatic connection between mobile user, wired or wireless dispatch station and user switch user. 7.3.5 Automatic connection from mobile user, wired or wireless dispatch station to local telephone user. For the connection from local telephone user to mobile user, mobile user group, wired or wireless dispatch station, when the control center and the local telephone terminal are connected by user line or continuous number selection user trunk line, it is generally manually transferred through the control center, and automatic connection can also be performed by two dialing; when the control center and the local telephone terminal are connected by trunk line, automatic transfer is performed.
7.4 Main signal tones
7.4.1 Connection tone
After the calling user issues a call request and the system allocates a voice channel, the calling and called users can talk after hearing the connection tone. 7.4.2 Call failure tone (or display)
After the calling user issues a call request, the call request is not responded to, and the calling user hears a sound, light or display, indicating that the call failed. 7.4.3 Busy tone
After the calling user issues a call request, if there is no idle voice channel in the system or the called user is busy, the calling user can hear a busy tone. 7.4.4 Whenever a mobile user talks to a local user, the signal tone should be consistent with the local call signal tone. 7.5 Roaming function
In a multi-zone network, mobile users have location registration and cross-zone search channel communication. 7.6 System management function
7.6.1 According to business needs, the operator can modify the operation parameters. 7.6.2 Statistical function
a. Count the traffic volume of each channel;
Count the traffic volume of each trunk line;
Count the traffic volume of different groups of users in the system. c.
7.6.3 Call records.
7.6.4 User access control.
7.6.5 Mobile station prohibition
GB15539 1995
A lost or stolen mobile station can be prohibited from operation by the operator. 7.6.6 The ability to designate several voice channels as control channels in turn. 7.6.7 Remote control and telemetry function.
7.6.8 Billing function
Select according to the actual operation of the dispatching network. 7.7 System self-diagnosis function
7.7.1 Periodically check the integrity of the controller. 7.7.2 Periodically check the interface of the base station repeater. 7.7.3 Periodically check the base station power supply. When the main power supply automatically switches to the backup power supply, it should be displayed on the system management terminal and there should be a visual or audible alarm.
7.7.4 When equipment components are damaged or malfunctioning, there should be a visual or audible alarm. 7.7.5 Self-diagnosis data can be displayed using a system management terminal. 8 Numbering method
8.1 Mobile user number
In the dispatching network, the mobile user number is 6 digits. The first two digits 10 to 98 are the base station area code, and the last four digits are the mobile user number. The full call and group call number is 99××××. The first two digits 99 are the prefix of the full call and group call, and the last four digits 0000 to 9999 are the full or group number. 0" is the prefix for mobile users to dial user exchanges or local telephone users. 8.2 Mobile User Identification Code
In the dispatching network, each mobile user is assigned a unique mobile user identification code to identify the number of the mobile user. This identification code is not the mobile user number.
The identification code uses 6 digits. It can correspond to the mobile user number or can be selected according to local conditions. In addition, each mobile user is also assigned a general call identification code and multiple group call identification codes. 9 Control Channel Configuration Mode
9.1 Dedicated Control Channel Mode
The dedicated control channel mode is to set up a control channel (signaling channel) dedicated to transmitting signaling, and the remaining channels are voice channels. The control channel can be replaced in turn by the control center at regular intervals. In the case of a small number of channels, when all voice channels are busy, the control channel can be used as a voice channel. As long as one of the voice channels is idle, this idle voice channel will be used as a new control channel. 9.2 Channel-associated signaling method
Each channel of base station A is fully capable of signaling transmission, connection and calls. 10 Signaling
10.1 Wireless signaling
Wireless signaling is a variety of signaling transmitted between base stations and mobile stations to establish calls. Wireless signaling adopts digital signaling in this standard, and the signaling format is not specified. However, when transmitted on wireless channels, the radio frequency bandwidth occupied by these signals shall not exceed the nominal bandwidth during normal calls. 10.2 Signaling between the control center and the base station The transmission rate of signaling between the control center and the base station is 1200bit/s, 2400bit/s, 3600bit/s or 4800bit/s. 10.3 Signaling between the control center and the regional control center The data transmission rate between the control center and the regional control center is 2400bit/s, 4800bit/s or 9600bit/s. 84
GB 15539- 1995
10.4 Signaling between the cluster system and the user switch or the local telephone network 10.4.1 Signaling method for accessing the user switch or the local telephone network by trunk line 10.4.1.1 When the inter-office DC line signaling
adopts the real line relay transmission, the line signaling, DC pulse signaling, and the inter-weekly DC signaling marking method shall comply with the relevant provisions of GB3379.
10.4.1.2 When the inter-office intra-band single-amount pulse line signaling adopts the frequency division or time division multiplexing relay transmission, the line signaling shall comply with the relevant provisions of GB3376. 10.4.1.3 When the inter-office digital line signaling
adopts the PCM digital relay transmission, the line signaling shall comply with the relevant provisions of GB3971.2. 10.4.1.4 Signaling of inter-office multi-frequency transmitters Signaling of multi-frequency transmitters shall comply with the provisions of GB3377. 10.4.2 Signaling method for connecting to user switches or local telephone networks via user lines 10.4.2.1 User signaling method
DC dial-up pulse signals and multi-frequency signals shall comply with the relevant provisions of GB3378. 10.4.2.2 Ringing current and signal tones
Ringing current and signal tones shall comply with the relevant provisions of GB3380. 11 General technical requirements for wireless equipment
11.1 Emission characteristics
11.1.1 Frequency tolerance
Within the specified power supply voltage range and the temperature range of the mobile environment, the frequency error of any carrier frequency emission shall not exceed 3×10-. 11.1.2 Spurious emission
Measured on a load with nominal output impedance connected to the antenna end, when the transmit carrier power is less than or equal to 25W, the spurious emission power of any discrete frequency shall not exceed 2.5μW. When the transmit carrier power is greater than 25W, the spurious emission power of any discrete frequency shall be 70dB lower than the transmit carrier power.
11.1.3 Adjacent channel power
The adjacent channel power shall be 70dB lower than the carrier power (base station, fixed station, vehicle-mounted station) and 55dB (handheld station). 11.1.4 Transmit intermodulation power
The power of each transmit intermodulation frequency shall be 70dB lower than the carrier power. 11.2 Receiving characteristics
11.2.1 Reference sensitivity
The reference sensitivity is 0.71±V (electromotive force) [(signal + distortion + noise) / (distortion + noise) = 12dB11.2.2 Adjacent channel selectivity
Adjacent channel selectivity should not be less than 70dB (base station, vehicle-mounted station), 60dB (handheld station). 11.2.3 Intermodulation suppression
Intermodulation suppression should not be less than 70dB (base station, vehicle-mounted station), 60dB (handheld station)11.2.4 Spurious response suppression
Spurious response suppression should not be less than 70dB (base station, vehicle-mounted station), 60dB (handheld station). 11.2.5 Blocking
In the frequency range of +1~+10MHz and -1~-10MHz on both sides of the nominal frequency, the blocking level of any frequency shall not be less than 90dB (base station, vehicle-mounted station) and 70dB (handheld station). 11.2.6 Spurious emission
Measured at the antenna terminal and matched terminal, the spurious emission power of the discrete frequency shall not exceed 2nW. 85
11.3 Audio characteristics
11.3.1 Audio bandwidth: 300~3000Hz. 11.3.2 Audio response
GB15539-1995
The amplitude variation range relative to 1000Hz is as follows: Transmitter: -3~+1dB (300~3000Hz); Receiver: -3~+1dB (300~3 000 Hz). 11.3.3 Harmonic distortion
Transmitter: harmonic distortion coefficient should not exceed 7%; Receiver: harmonic distortion coefficient should not exceed 7%. 12 Interface
12.1 Interface between cluster communication system and user switch or local telephone network 12.1.1 The interface of cluster communication system accessing user switch or local telephone network through user circuit adopts user line interface. If the user line is a solid line, the interface parameters shall comply with the relevant provisions in GB6282 and GB3378. If carrier transmission is adopted, the interface parameters shall comply with the relevant provisions in GB3384 and GB3379. 12.1.2 The interface of cluster communication system accessing user switch or local telephone network through relay circuit adopts audio cable or carrier transmission, and the interface parameters are the same as those in 12.1.1. PCM relay circuit is adopted, and the nominal bit rate is 2048Kbit/s digital interface, and the interface parameters comply with the relevant provisions in GB7611. 12.2 Data Interface
When the control center is connected to a data terminal or computer, the transmission rate can be 1200bit/s, 2400bit/s, 4800bit/s or 9600bit/s. The interface adopts RS-232 serial interface or other existing standard interface. 86
A1 Working frequency band
800MHz frequency band:
GB15539--1995
Appendix A
Frequency allocation of cluster communication network
(Supplement)
806~821MHz (mobile station sends, base station receives); b.
851866MHz (base station sends, mobile station receives). Channel spacing
The adjacent channel spacing is 25kHz, and the last three significant digits of the nominal frequency are 12.5.37.5, 62.5, 87.5 (in kHz). Duplex transceiver interval
Duplex transceiver interval is 45MHz.
A4 Transmitter identification
The transmit identification is 16K0F3E.
A5 Channel allocation
The channel allocation method of equal intervals in the 800MHz frequency band trunking mobile communication network: The frequency points of channel numbers 1, 2.···600 are 806.0125MHz, 806.0375MHz·..·820.9875MHz (mobile station transmits, base station receives), 851.0125MHz.851.0375MHz·*·865.9875MHz (base station transmits, mobile station receives). The 800MHz frequency band is divided into three sections: 806~811MHz, 851~856MHz, 811~816MHz, 856-~861MHz and 816-~821MHz.861~866MHz, each with 200 channels. The corresponding table of group numbers and channel numbers of the first section of 200 channels is shown in Table A1. The group numbers and channel numbers of the second or third section of 200 channels are simply the group numbers in Table A1 plus 10 or 20, and the channel numbers plus 200 or 400.
Table A1800MHz nest system group number and channel number correspondence table group
Frequency avoidance number
1,41,81,121,161
21,61,101,141,181
11,51,91,131,171
31,71+111,151+191
2,42,82,122,162
22,62,102,14 2,182
12,52,92,132,172
32,72,112,152,192
3,43,83,123,163
23,63,10 3,143,183
13,53+93,133+173
33,73,113,153,193
4,44,84,124,164
24,64 104,144,184
14,54,94,134,174
34,74, 114,154.194
5,45,85,125, 165
25,65105145,185
15,55,95,135,175
35,75,115,155,195
Channel number
6.46.86,126,166
26,66,106,146,186
16,56,96,136,176||tt ||36,76,116,156,196
7,47,87,127,167
27,67,107,147,187
17,57. 97.137,177
37,77.117,157,197
8,48,88.128,168
28,68,108,148, 188
18,58,98,138,178
38,78,118,158,198
9,49,89,129,169
29,69,109,149,189
19,59,99,139,179
39,79,119.159,199
10,50,9 0,130,170
30,70,110,150,190
20,60,100.140,180
40,80,120.160,200
Additional Notes:
GB15539—1995
This standard was proposed by the State Radio Management Committee. This standard is under the jurisdiction of the State Radio Management Committee Office. This standard was drafted by the State Radio Monitoring Center (host) and Guangzhou Institute No. 7 of the Ministry of Electronics (co-host). The drafters of this standard were Chen Xiasheng, Huo Gang and Du Tingshan. 88
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