Method for improving packet data transmission rate of TETRA system
A technology of packet data and transmission rate, applied in the direction of adjustment of transmission rate, adjustment of transmission mode, transmission system, etc., can solve the problem of reduction of effective packet data DATA, etc.
Active Publication Date: 2021-03-26
EASTERN COMM
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The IP header and UDP header in the application data occupy at least 28 bytes in total (the IP header is at least 20 bytes, and may be more), that is, 224 bits, which occupy a considerable proportion of the load in the entire data packet, causing each frame to The effective packet data DATA transmitted is greatly reduced
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[0025] Below in conjunction with accompanying drawing, the present invention will be further described:
[0026] The TETRA standard data header cannot be changed. To increase the transmission rate of packet data, it is possible to consider compressing the application data part of the packet. There is a lot of redundant information in the IP and UDP data headers. On the same transmission link, the destination IP address, source IP address, destination port, and source port of data packets in the same direction remain unchanged. If the repeated transmission of these information on the air interface can be reduced, the transmission rate of packet data packets can be greatly increased. Therefore, this article refers to the PDCP protocol in UMTS on the public network, and improves the applicability on this basis to provide a compression protocol TPDCP suitable for TETRA packet data IP header and UDP header, which is used to improve the air interface transmission rate of TETRA trunk...
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The invention relates to a method for improving the packet data transmission rate of a TETRA system. The method is characterized in that when a first data packet is sent between an MS and a PDC, two communication parties locally establish a connection address learning table, fixed or regularly-changed information in a data packet header domain is stored, and after the learning table is successfully established, complete UDP data does not need to be sent any more in subsequent data sending, only the data part which is changed compared with the previous data packet needs to be sent, and the receiving end recovers the compressed data according to the locally stored header field information of the previous data packet, constructs a complete UDP data packet and submits the complete UDP data packet to an upper-layer application. According to the TPDCP protocol, on the premise that a TETRA standard packet protocol is not violated, the IP header and the UDP header are compressed, transmissionof repeated information in an air interface is effectively reduced, and when the packet data load is small, the transmission rate can be increased by more than one time when the IP header and the UDPheader are compressed.
Description
technical field [0001] The invention relates to a method for increasing the transmission rate of packet data in a TETRA system. Background technique [0002] TETRA digital trunking communication system is a wireless trunking mobile communication system based on digital time division multiple access technology, which can provide users with multi-group scheduling function, short data information service, digital voice service, and packet data service. In a typical TETRA system, the grouping function is mainly used for image transmission, mobile Internet, database query, etc. [0003] The typical TETRA digital communication system packet data packet transmission structure between network elements is as follows: figure 1 , where MS, BS, and PDC are network element components of the TETRA packet system, and WAP is an external gateway connected to the TETRA packet system. The MS and the BS send packet data packets through the air interface. IP, UDP, and DATA form a standard UDP ...
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IPC IPC(8): H04W28/06H04L1/00H04L29/06
CPCH04W28/065H04L1/0002H04L1/0007H04L69/164H04L69/04Y02D30/70
Inventor 张小琴郭月强周利满
Owner EASTERN COMM