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Handover method for mobile communication system of high-speed railway

A mobile communication system and high-speed railway technology, applied in the field of handover technology, can solve problems such as failure accidents, frequent handover communications, and inability to adapt handover algorithms to achieve the effect of improving adaptability and reducing the number of handovers

Inactive Publication Date: 2012-10-10
北京智讯天成技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a handover method in a high-speed railway mobile communication system, to adapt to the characteristics of complex and changeable wireless channel quality in the railway environment, and to solve the problem that the handover algorithm with fixed parameters cannot adapt to the external wireless signal transmission environment (mainly in the environment) The problem of frequent handover or communication failure accidents caused by changes in noise and interference), and a better compromise between the number of handovers and the quality of communication services is found through a low-cost and easy-to-implement adaptive handover method

Method used

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  • Handover method for mobile communication system of high-speed railway
  • Handover method for mobile communication system of high-speed railway
  • Handover method for mobile communication system of high-speed railway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment one, such as image 3 As shown, it is a flow chart of the thin terminal adaptive handover algorithm (the calculation of the h value and the handover trigger judgment are performed at the base station), including the following steps:

[0056] Step 301, the terminal measures each cell according to the number n of adjacent cell lists to be measured received from the current serving cell and the CID of each adjacent cell base station, and performs filtering to measure the number of each adjacent cell RSRP value, and save these values, record the RSRP value of each neighboring cell as RSRP1, RSRP2, ..., RSRPn; The RSRQ values ​​are denoted as RSRP0 and RSRQ0.

[0057] Step 302: Calculate RSRP1-RSRP0, RSRP2-RSRP0, .

[0058] Step 303, the terminal reports the RSRQ value of the current serving cell and the maximum value of the calculated RSRP difference to the base station, and the base station determines the corresponding handover hysteresis threshold h value req...

Embodiment 2

[0066] Embodiment two, such as Figure 4 As shown, it is a flow chart of the thin base station adaptive handover algorithm (the calculation of the h value and the handover trigger judgment are performed at the terminal), including the following steps:

[0067] Step 401, the terminal measures each cell according to the number n of adjacent cell lists to be measured received from the current serving cell and the CID of each adjacent cell base station, and performs filtering to obtain the RSRP of each adjacent cell Values ​​(denoted as RSRP1, RSRP2, ..., RSRPn) and the RSRP and RSRQ values ​​of the current serving cell (denoted as RSRP0 and RSRQ0).

[0068] Step 402, the terminal calculates RSRP1-RSRP0, RSRP2-RSRP0, ..., RSRPn-RSRP0 respectively, which are respectively recorded as △RSRP1, △RSRP2, ... △RSRPn, and finds the maximum value among them, and records the maximum value as △RSRP, and the terminal The neighbor cell CID corresponding to the maximum value is saved for subseq...

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Abstract

The invention discloses a handover method for a mobile communication system of a high-speed railway. The method comprises the following steps of: measuring reference signal received power (RSRP) values and reference signal received quality (RSRQ) values of a current service cell and neighbor cells; calculating difference values DeltaRSRP of the RSRP values of the neighbor cells and the current service cell, and finding a maximum value in the difference values; determining a corresponding handover hysteresis threshold value according to the RSRQ value of the current service cell and the maximum difference value DeltaRSRP, performing handover triggering judgment, and if a condition is consistent with a handover triggering condition, determining a target evolved-NodeB for a terminal, and transmitting the context information of the terminal and a handover request to the target evolved-NodeB for handover operation. By the method, high quality of service can be obtained by advanced handover in a poor wireless signal transmission environment, and unnecessary handover can be suppressed in a good wireless signal transmission environment, so that handover times are reduced, the capability of adaptation to channel quality is improved, and a good compromise between the handover times and the quality of service of communication can be made.

Description

technical field [0001] The invention relates to the field of high-speed railway wireless communication, in particular to the switching technology in the future LTE-R communication system. Background technique [0002] At present, my country's railway dedicated wireless communication system is GSM-R communication system based on GSM technology, and 3G technology has not been adopted because 3G is not yet a mature commercial communication system, and its technical specifications have not considered railway applications. , so it does not meet the safety standards required by the railway. Moreover, there is no essential difference between 3G technology and 2G technology in terms of voice services. Therefore, at present, the International Union of Railways (UIC) stated that GSM-R will directly transition to "quasi-4G" LTE-R (Long Term Evolution for Railway) in the future. Compared with GSM-R, LTE-R supports higher train speed, higher security, higher data transmission rate and ri...

Claims

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Application Information

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IPC IPC(8): H04W36/00H04W36/08H04W36/24
Inventor 孙斌黄进金心宇胡阳
Owner 北京智讯天成技术有限公司
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