4.8kb/s data service transmission method based on IP (Internet Protocol) GSM-R (Global System for Mobile Communications-Railway) network

Abstract

The embodiment of the invention provides a 4.8kb/s data service transmission method based on an IP (Internet Protocol) GSM-R (Global System for Mobile Communications-Railway) network. The method mainly comprises the following steps: a BTS (Base Transceiver Station) receives a data frame sent from an air interface by a vehicle-mounted terminal, and the data frame is identified to be a 4.8kbit/s data frame; the BTS carries out speed conversion processing on a 4.8kbit/s data business frame to obtain a 64kb/s standard data frame; the BTS sends the 64kb/s standard data frame to BSC (Base Station Controller) equipment through an IP Abis interface. According to the 4.8kb/s data service transmission method, the Abis interface based on IP transmission adopts a transmission speed of 64kb/s and an RTP frame packaged with the 64kb/s standard data frame is directly sent to the BSC equipment, so that a speed conversion process of TRAU including RAA, RA2 code rate conversion and the like is omitted; the BSC equipment can directly transmit to train control server equipment including MSC and the like at the speed of 64kb/s, so that the end-to-end data transmission delaying is greatly reduced, the data transmission reliability is improved, and the CTCS-3 railway safety data transmission reliability is improved.

Description

technical field [0001] The invention relates to the technical field of train operation control, in particular to a 4.8kb / s data service transmission method based on an IP-based GSM-R network. Background technique [0002] China Train Operation Control System Level 3 (hereinafter referred to as CTCS-3) train control system is the core safety system of domestic high-speed railways. As a part of the train control system, the GSM-R network (Global System for Mobile Communication for Railway) carries the transmission of train control information and provides a two-way information exchange channel for on-board equipment and wireless block centers. The on-board equipment receives information such as driving permit, temporary speed limit and line parameters issued by the RBC through the GSM-R network; the RBC receives the train dynamic information (such as train speed, position, etc.) transmitted by the on-board equipment through the GSM-R network. [0003] In the public network, c...

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Problems solved by technology

[0011] The shortcoming of a traditional GSM-R4.8kbit / s data service rate adaptation process using the Abis interface based on the IP transmission mode in the above-mentioned prior art is: taking into account the requirements for interconnection between network elements, it is necessary to carry out in the MSC equipment RTP conversion, and RAA, RA2 code rate conversion, these RTP conversions, and RAA, RA2 code rate conversion have the delay loss of code rate conversion, which also makes the CTCS-3 railway safety data transmission process have bit errors on the Abis interface produce possible

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