Patent ID: 8934912
Filing Date: 2015-01-13
Classification: H04W

Abstract:
1. A method for deciding an unregistered macrocell user equipment (MUE) adjacent to a femtocell base station (home evolved node B; HeNB), the method comprising: deciding, by a macrocell base station (macro evolved node B; MeNB), that an unregistered MUE is influenced by interference from an adjacent HeNB based on a channel status of the unregistered MUE; requesting, by the MeNB, the unregistered MUE to perform a proximity search to collect system information (SI) of the adjacent HeNB of which interference has influence on the unregistered MUE, searching for, by the unregistered MUE, the SI of the adjacent HeNB, and transmitting the searched SI to the MeNB, when it is decided that the unregistered MUE is influenced by interference from the adjacent HeNB; and informing, by the MeNB, the adjacent HeNB of existence of the unregistered MUE using a closed subscriber group identifier (CSG ID) of the SI of the adjacent HeNB, transmitted from the unregistered MUE, wherein informing the adjacent HeNB of the existence of the unregistered MUE comprises: transmitting, to a mobility management entity (MME), a HO request message containing cell global identity (CGI), CSG ID, IC indication, and csg MemberStatus; identifying, by the MME, whether or not the IC indication is contained in the HO request message, and transmitting an IC request message containing the IC indication to the adjacent HeNB when it is identified that the IC indication is contained in the HO request message; and comparing, by the adjacent HeNB, the CSG ID in the IC request message with its own CSG ID, and deciding that the unregistered MUE exists when the CSG ID in the IC request message corresponds to its own CSG ID.