Digital trunked packet data transmission system
A technology of packet data and digital trunking, applied in transmission systems, broadcast service distribution, electrical components, etc.
Inactive Publication Date: 2012-07-18
TIANJIN 712 COMM & BROADCASTING CO LTD
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However, there is no such technology reported in the domestic literature
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[0016] In order to understand the present invention more clearly, describe the present invention in detail in conjunction with accompanying drawing and embodiment:
[0017] Such as figure 1 As shown, the digital trunking packet data transmission system includes a vehicle dedicated radio station and a system server. Several vehicle dedicated radio stations are connected to the system server through the air interface of the digital trunking system (the interface between the mobile terminal and the base station).
[0018] Such as figure 2 As shown, the vehicle dedicated radio station is mainly composed of a control unit, a transfer unit, a display operation unit interface, a recording unit, a TETRA module (Terrestrial Trunked Radio) and a power supply unit.
[0019] The control unit adopts the microcontroller chip S3C2440;
[0020] The transfer unit adopts the microcontroller chip ATmega128 to perform audio circuit conversion control and packet data transfer contro...
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The invention relates to a digital trunked packet data transmission system. The system comprises vehicle-mounted special radio stations and a system sever, a plurality of vehicle-mounted special radio stations are connected with the system server through an air interface of a digital trunked system, a vehicle-mounted special radio station mainly comprises a control unit, a switching unit, a display operation unit interface, a recording unit, a terrestrial trunked radio (TETRA) module and a power supply module, a multiplexing (CMUX) scheme is adopted by the vehicle-mounted special radio station control unit, the connection of a plurality of data links on a physical serial interface is realized, so that a plurality of sessions such as voice, FAX, data and short messaging service (SMS) can exist on the serial interface simultaneously. By a new data transmission technology provided by the invention, train security information, train load capacity information and the like can be viewed in real time, namely when a normal voice call is ensured, the vehicle-mounted special radio stations can perform packet data transmission with the system server through the air interface of the digital trunked system, and the digital trunked packet data transmission system is applied to the field of wireless communication of light railway and metro rail transportation.
Description
technical field [0001] The invention relates to a wireless communication data recording device, in particular to a digital cluster grouping data transmission system, which is suitable for the wireless communication field of light rail and subway rail transit. Background technique [0002] The use of TETRA wireless communication system in the field of light rail and subway has been generally recognized at home and abroad, but based on different users, the requirements put forward are also different. Now more and more subway lines require real-time viewing of train safety information, load information, etc., such as Shanghai Metro Line 10, Chongqing Rail Transit Line 6, and Chengdu Metro Line 2. Although the TETRA system supports voice and packet data services at the same time, for the same vehicle dedicated radio, it cannot be transmitted with voice at the same time as short data services, so voice is required to have the highest priority. Therefore, when the vehicle-mou...
Claims
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IPC IPC(8): H04W4/10H04L29/08
Inventor 岳枫王宁王智超
Owner TIANJIN 712 COMM & BROADCASTING CO LTD