High-speed railway mobile network covering method based on distributed antenna and fixed switching channel

Abstract

The invention belongs to the technical field of mobile communication, in particular disclosing a high-speed railway mobile network covering method based on a distributed antenna and a fixed switching channel. BBU+RRU radio frequency remote technology is adopted to conduct high-speed railway linear covering; N numbered channels are divided into a logic channel; N numbered RRUs cover a logic channel; a BBU corresponds to a logic channel; the adjacent part of two logic channels is independently provided with an RRU which is not only connected with the BBU corresponding to the previous logic channel, but also connected with the BBU corresponding to the next logic channel; the covered range of the independent RRU is defined to be the fixed switch channel, and fixed direction switching is completed by utilizing the fixed switching channel and the train operating direction at the edge of the channel. The switching process is simple in operation and has accurate, thus greatly lowering the probability of drop-call during switchover at the edge of the channel and avoiding ping-pong switchover of the channel.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a method for fixedly switching cells in the coverage of high-speed rail mobile networks. Background technique [0002] With the great development of high-speed railway, by 2010, the national railway operating mileage will reach 85,000 kilometers, of which the 200km / h section will reach 6003km, and the maximum speed of Beijing-Tianjin high-speed railway and Beijing-Shanghai high-speed railway can reach more than 350Km / h. In this high-speed mobile scenario, due to the influence of Doppler frequency shift, there are relatively high requirements for cell selection, reselection, and handover. [0003] At present, the commonly used communication cell switching method is only suitable for the situation that the cell users are static or moving at a low speed, but when most of the cell users are in a high-speed motion state, such as on a high-speed railway, due to...

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Problems solved by technology

[0003] At present, the commonly used communication cell switching method is only suitable for the situation that the cell users are static or moving at a low speed, but when most of the cell users are in a high-speed motion state, such as on a high-speed railway, due to the small distance between stations, the train speed is very fast , then the time for the train to pass through the cell will be greatly shortened, thus causing frequent cell switching

At the same time, since the overlapping coverage area between the cells is fixed, the time for the train to pass through the overlapping coverage area is shortened, and the switching time is basically unchanged, so the probability of successful switching will decrease accordingly, and the probability of dropped calls will be extremely low. with rising

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