Cell reselection method and device applied to multi-carrier condition, method and device for reducing access load of cells

Abstract

The invention discloses a cell reselection method and device applied to a multi-carrier condition. According to the cell reselection method and device, UE adjusts cell reselection strategies according to acquired cell load information, priority information and other information, so that the problem of cell overload can be avoided; cell priority configuration related to the capabilities of the UE is introduced, so that UE supporting specific functions can preferentially reside in cells supporting the functions, and therefore, the improvement of user experience can be benefitted. The present invention discloses a method and device for reducing the access load of cells. According to the method and device for reducing the access load of the cells, as for cells where overload has already occurred, the current load of the cells can be effectively alleviated through limiting access requests or paging for services with high time delay tolerance. According to the cell reselection method, the cell reselection device, the method and device for reducing the access load of the cells provided by the technical schemes of the invention, the advantages of existing cell selection strategies are retained, and at the same time, the problem of load unbalance of the cells can be avoided; an existing system is just slightly modified, and the compatibility of the system will not be affected. The methods and devices have the advantages of simplicity in implementation and high efficiency.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, and more specifically relates to a cell reselection method and a terminal capable of effectively balancing cell loads in a multi-carrier environment. Background technique [0002] In the current LTE network (Release-12), after the UE completes the initial cell selection, it receives the broadcast message of the cell, obtains the cell reselection priority information of the current cell frequency (ie, the service carrier frequency), and obtains the cell frequency of the neighboring cell at the same time list (referred to as neighbor frequency list), for each neighbor frequency in the neighbor frequency list, the system message includes the corresponding cell reselection priority information and the corresponding cell reselection threshold, and the UE performs cell reselection according to the above information. In the process of cell reselection, if the reselection priority ...

AI Technical Summary

Problems solved by technology

[0004] However, with the development of multi-carrier technology and small cell (Small Cell) technology, the current network deployment environment is becoming more and more complex. In the same area, there may be three or more frequency coverage, and the coverage of different frequency cells In this network environment, the above cell reselection mechanism based on carrier frequency priority will cause all idle UEs to camp on the carrier frequency with the highest priority in a certain area. As a result, the data transmission load and access load of the cell working on this carrier frequency are too heavy, while the load of other cells with lower priority frequencies is lighter, and the purpose of load balancing cannot be achieved.

[0005] Under the technical framework of the current LTE system, for an overloaded cell, some UEs in the cell can be transferred to adjacent frequency cells by means of redirection or handover. However, the above two methods require UE-specific information. Instructions indicate that this will increase the signaling load of the cell. In addition, these two methods cannot fundamentally solve the problem of load imbalance between different carrier frequencies, because UEs transferred to other cells through transfer access or handover, will After entering the idle state, it will camp on the cell corresponding to the carrier frequency with the highest priority, and these UEs may re-initiate access and data transmission requests

Another possible solution is to reduce the number of access users through access barring, but this method not only cannot fundamentally solve the problem of load imbalance, but will also lead to an increase in user access delay, which is Unacceptable for delay-sensitive services

[0006] It can be seen that in a multi-carrier network environment, the current cell reselection mechanism based on carrier frequency priority cannot achieve a balanced distribution of idle UEs among cells corresponding to different frequencies, which will further cause data transmission load and access in these cells The load imbalance will eventually lead to the waste of network resources and the decline of user experience

For this problem, there is no ideal solution

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