Method, device and system for cell reselection

Abstract

Embodiments of the present invention provide a cell reselection method, device, and system. The method includes: receiving a broadcast message sent by a base station in a first cell, where the broadcast message includes second cell set information; when according to the second cell set information When it is determined that the target cell for reselection is the second cell, determine the time for performing cell reselection according to the second cell reselection parameter information, or when it is determined according to the second cell set information that the target cell for reselection is not the second cell, The time for performing cell reselection is determined according to the first cell reselection parameter information. In the embodiment of the present invention, the base station may add new indication information in the broadcast message. According to the indication information, the user equipment determines the time for cell reselection by determining whether the target cell is a low-power node, thereby improving the efficiency of cell reselection. Or reduce ping-pong cell reselection to save power.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more specifically, relates to a cell reselection method, device and system. Background technique [0002] Future mobile communication systems will provide higher data rate transmission and wider service coverage. In order to reduce coverage black holes and improve the service experience of edge users, more low-power nodes (LPN, LowPowerNode) will be deployed in heterogeneous cellular networks (that is, heterogeneous networks, also known as Hetnet scenarios). In a heterogeneous network, UEs can access not only macro base stations, but also any low-power access nodes in the network through wireless access technology, so as to expand network coverage and ensure user service quality (QoS, Quality of Service). A low-power access node is simply referred to as a low-power node hereinafter. [0003] For an LTE (Long Term Evolution) network, cell reselection in IDLE (idle) mode is base...

AI Technical Summary

Problems solved by technology

[0007] Scenario 1: If the value of Treselection configured by the network is large, when the user equipment (UE, UserEquipment) moves from a macrocell (Macrocell) to a low-power node cell (such as a micro-cell picocell, pico is a kind of low-power node), Due to the long time of Treselection, the user cannot reselect to the micro cell in time, so the user is likely to experience radio link failure, or the micro cell will cause strong interference to the UE, so that the UE cannot operate in IDLE mode. Receive the paging information of the original macro cell normally

[0008] Scenario 2: If the value of Treselection configured by the network is small, when the UE moves at the edge of two macro cells, the UE undergoes ping-pong cell reselection due to the small Treselection, which will lead to frequent reselection in IDLE mode, thus Can not achieve better power saving performance

[0009] Scenario 3: If the value of Treselection configured by the network is 0 or not configured, the UE will perform cell reselection according to Tevaluate in Table 1. It can be seen that the evaluation time is at least 5s, and this evaluation time is for macro cells. -For the Macro-pico scenario, it takes a long time to evaluate. Like Scenario 1, it will lead to wireless link failure and failure to receive paging information from the macro cell.

From the analysis of the above situation, the original evaluation time scheme for cell reselection of macro cells can no longer be applied to heterogeneous networks, which may cause link failure, failure to receive paging information, and ping-pong reselection, etc. question

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