Rapid switching method used for time division long term evolution (TD-LTE) communication system and based on relay switching

Abstract

The invention provides a time division long term evolution (TD-LTE) rapid switching method based on relay switching. The TD-LTE rapid switching method based on the relay switching aims at the phenomenon that channel switching of a high speed railway TD-LTE communication system is frequent and aims at meeting the requirements for short switching time and a high switching success rate. The TD-LTE rapid switching method based on the relay switching is characterized in that a train head train-mounted relay of a train and a train tail train-mounted relay of the train are respectively and additionally provided with a back-up train-mounted relay, main train-mounted relays and the back-up train-mounted relays are connected with a user in the train, when the train does not enter a switching zone, the user carries out communication through the main vehicle-mounted relays, when a source base station evolved node B (eNodeB) decides that switching is required according to a measurement report of user equipment (UE), the main train-mounted relays carry out the switching, meanwhile, the back-up train-mounted relays are started to transmit data flow, and an original data link is recovered after the train runs out of the switching zone. According to the TD-LTE rapid switching method based on the relay switching, switching time delay is reduced, and particularly, the phenomenon of call drop due to failed wireless link caused by hard switching of a long time evolution (LTE) system is reduced. The aim of rapid switching in high-speed moving environment is achieved. The times of communication call drop are reduced. The switching success rate is improved. Service quality of a high-speed broadband mobile service is enhanced. A multi-media broadband mobile internet service inside the high-speed railway train is developed in a promoted mode. The day-by-day increasing requirements of a passenger for a mobile communication service are met.

Description

Technical field: [0001] The invention belongs to the field of wireless mobile communication. In a specific scenario of a high-speed railway environment, the invention studies the switching of mobile devices in a train of a Time-Division Duplex Long Term Evolution (Time-Division Duplex Long Term Evolution, TDD-LTE or TD-LTE) communication system The method is used to solve the problem of high handover failure rate caused by frequent cell handover when the terminal moves at high speed. Background technique: [0002] High-speed railway has become an important part of my country's transportation system. The rapid development of high-speed railway construction and operation and the sharp increase in the demand for multimedia services in trains have put forward higher requirements for the development of communication technology. Due to the high-speed trains running fast and wireless The loss of the signal penetrating the train body is large, not only the wireless signal attenuation...

AI Technical Summary

Problems solved by technology

[0014] Due to the particularity of the high-speed railway channel environment and networking mode, the above-mentioned A3 handover judgment criterion cannot adapt to the high-speed railway environment. Due to the high-speed running of the train, the handover time is short; in addition, factors such as complex terrain and surrounding electrical equipment on the high-speed railway The channel environment will also have a great impact. Using the A3 handover judgment criterion will cause frequent handover failures, lower handover success rate, lower communication quality, and poor customer experience. Therefore, it is necessary to consider adopting a judgment criterion that adapts to the high-speed railway environment

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