Method for selecting cell after failure of Backhaul link in relay system

Abstract

The invention discloses a method for selecting a cell after a failure of a Backhaul link in a relay system, which mainly solves the problems of poor stability and low voice quality of a user in a Backhaul link recovering method performed in an original cell in the prior art. The method comprises the following implementation steps of: 1) after a relay detects the failure of a radio link, starting a T311 timer and starting to perform cell selection in a plurality of cells to which an original base station belongs; 2) recovering an access layer of the Backhaul link in a selected cell; 3) if the access layer is not recovered successfully, converting the state of radio resource control into an idle state; starting the T311 timer; and performing the cell selection in preconfigured base stations; and 4) recovering a non-access layer of the Backhaul link in the cell selected from the preconfigured base stations. By using the method, the relay can not only perform the cell selection in the original base station, but also can perform the cell selection in other preconfigured base stations, which expands a cell selection range, can recover the Backhaul link stably, and improves the voice quality of the user.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a cell selection method, which can be used in a Backhaul link in a relay system, that is, to select a cell after the link between the relay and a base station fails. Background technique [0002] Due to the impact of terrain and emergencies in modern communication, users in a certain area of ​​the cell often cannot get good communication services. For this reason, relays are introduced to solve this problem. The deployment of relays increases the system capacity of the coverage area, and can cover areas that cannot receive base station signals due to terrain restrictions, improving call quality. Since the relay can be used not only as a common user but also as a base station, the introduction of the relay also brings many problems, among which the occasional failure of the Backhaul link is one of the more prominent problems. [0003] The failure between the base sta...

AI Technical Summary

Problems solved by technology

[0006] The biggest disadvantage of this relay pre-configuration method is that it does not take into account those cells that will have better link quality with the current relay

If the link quality between the original base station and the wireless link of the relay is unstable for a long time, the attempt to link between the relay and the original base station is often invalid. The instability of the quality causes the Backhaul link to fail again, so it needs to be restored again, which not only wastes resources, but also has unstable voice quality for users currently using this trunk

Images