Cell selection method, user terminal and access network control node

Abstract

This invention discloses a method of selecting cell, user terminal and access network control node. Utilizing this invention, when the user terminal selects cell, the user terminal AC and the access limiting information of the cell are considered so as to ensure that the cell accessed by the user terminal does not limit the user terminal AC and reduce the probability of overload of the finally selected target cell, so that the process that the target cell controls the load is reduced and the system resource is saved; at the same time, the business still can be initiated after the user terminal selects the cell because the user AC can not be limited by the cell accessed by the user terminal that is ensured. Therefore, the service quality is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for selecting a cell, a user terminal and an access network control node. Background technique [0002] In the mobile communication system, when the signal received by the user terminal is getting weaker and weaker during the moving process, in order to ensure the communication quality of the user terminal, the user terminal must be switched from the original cell to a new cell with stronger signal. In the prior art, the user terminal measures adjacent cells, usually the adjacent cell list in the measurement control message received by the user terminal, measures the cells in the list, and reports the measurement report to the access network control node, such as The base station or radio network controller, the access network control node selects a target cell that meets the handover condition according to the measurement report, and initiates handover from the source cell to ...

AI Technical Summary

Problems solved by technology

However, in the prior art, when a user terminal is handed over to a target cell, if the AC of the user terminal is included in the access restriction information of the target cell, AC restriction measures have been taken because of load overload, so the target cell The probability of causing load overload is high. If this UE handover switches to the target cell and causes load overload, in order to control the load overload, it is necessary to carry out the load control process. At this time, the common method adopted is to directly cut off the user connection. Or forcibly switch some users to other cells to reduce the load of the target cell, and this process of load control needs to consume system resources

[0004] In addition, if the target cell access restriction information includes the AC of the user terminal, after the user switches to the target cell, when the session ends or the state transitions to the idle state due to abnormal circumstances, the timer for the AC restriction in the cell expires Before, it is impossible to initiate business again, which brings inconvenience to users

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