Mobile Handoff Method Based on Coordinated Multipoint Transmission

Abstract

The invention discloses a mobile switching method based on coordinated multipoint transmission and mainly solves the problem in the prior art that in a heterogeneous network densely distributed with micro cells, a mobile user needs to frequently switch over. The mobile switchover method comprises the following realization steps: (1) the time when the mobile user detects a reference signal of a macro base station for the first time and a serving cell are initialized; (2) the user judges whether a cell set capable of being detected is an empty set or not at an interval of time T, if yes, mobile switchover is terminated, and if not, a control cell decides that the user performs virtual cell switchover according to switchover conditions; (3) the user determines a main cell and reports global channel state information to the main cell; (4) the main cell searches an optimal virtual cell for the user to switch over according to the global channel state information, and after the switchover is successful, the step (2) is returned. According to the mobile switchover method, the switchover frequency of the user in the moving process is reduced. The mobile switchover method can be applied to a downlink in a heterogeneous wireless network environment where macro cells and micro cells coexist.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a mobile switching method of a user, which can be used for the downlink of a heterogeneous wireless network in which a macro cell and a micro cell coexist. Background technique [0002] In order to meet the increasing data transmission needs of users and increase the total capacity of the network, especially to improve the communication quality of users in hot spots and blind spots, operators deploy a large number of low-power nodes under traditional macro base stations, such as micro cells and pico cells , home cells, relay nodes, etc. These low-power nodes are collectively called micro cells, which form a heterogeneous network where macro base stations and micro cells coexist. The mobile handover of the user means that the user will move from the coverage area of ​​the serving cell to the coverage area of ​​another cell during the mobile process. At t...

AI Technical Summary

Problems solved by technology

Although the handover algorithm improves the capacity of the system, it cannot guarantee that the number of handovers will be minimized. In areas where micro cells are densely deployed, frequent handovers of users will seriously affect the communication quality of users.

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