Method and apparatus for performing handover in c-ran system

Abstract

A method and apparatus for performing handover by a user equipment (UE) in a C-RAN system is disclosed. The method for performing handover by a user equipment (UE) in a Cloud Radio Access Network (C-RAN) includes: measuring at least one candidate remote radio head (RRH); transmitting feedback information caused by the measurement to a primary RRH; and receiving information regarding a changed primary RRH according to the measurement result received from the primary RRH, wherein the measurement is performed to discriminate each RRH on the basis of a channel state information-reference signal (CSI-RS) antenna port discriminated per the at least one candidate RRH.

Description

TECHNICAL FIELD[0001]The present invention relates to wireless communication, and more particularly to a method and apparatus for performing handover in a Cloud Radio Access Network (C-RAN) system.BACKGROUND ART[0002]The 30-years history of mobile communication commercialization on the basis of AMPS (the first-generation analog mobile communication systems) has caused a rapid change in society, such that mobile communication technologies have rapidly come into widespread use and been commercialized throughout the world. Specifically, mobile communication networks have generated a variety of changes throughout modern society in recent times, and have also rapidly developed.[0003]Expansion of third-generation communication system has been considerably delayed due to irregular development of mobile communication and mobile computing, and fourth-generation communication systems have been rapidly developed in response to the computing environment rapidly changing from personal computers ...

AI Technical Summary

Benefits of technology

[0031]As is apparent from the above description, the UE performs efficient measurement for handover in the C-RAN system, and properly selects a primary RRH or a serving RRH so as to performs communication, resulting in an increase in communication performance.

[0032]It will be appreciated by persons skilled in the art that the effects that can be achieved with the present invention are not limited to what has been particularly described hereinabove and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

Problems solved by technology

Since the communication service environment has rapidly changed over the last decade, it is very difficult for users to predict how much the communication service environment will change in the next decade.

Although current mobile communication systems mainly operate at 3 GHz or less, many developers and companies are conducting intensive research into higher bands due to bandwidth limitations.

However, the 4 G communication system has serious unbalance in service quality between a cell edge region and normal cell regions because a difference between spectrum efficiency of the cell edge region and average spectrum efficiency of a cell is 30 times or more.

However, when the UE performs handover in the C-RAN system, a method for performing UE measurement, a method for classifying nodes in the C-RAN system during the UE measurement, and a method for enabling the UE to perform handover through such measurement have yet to be proposed.

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