Patent ID: 9125118
Filing Date: 2015-09-01
Classification: H04W

Abstract:
1. A method of performing an X2 interface setup in a wireless communication system, the method comprising: transmitting, by a first home evolved NodeB (HeNB), an X2 setup request message to a second HeNB via an HeNB gateway (GW), the X2 setup request message including a first cell access mode indicator indicating a cell access mode of the first HeNB; receiving, by the first HeNB, an X2 setup response message from the second HeNB via the HeNB GW, the X2 setup response message including a second cell access mode indicator indicating a cell access mode of the second HeNB; determining, by the first HeNB, whether an X2 interface between the first HeNB and the second HeNB is available or not for an X2 handover based on the cell access mode of the second HeNB; and transmitting, by the first HeNB, an X2 handover request message to the second HeNB when the X2 interface is available, wherein the first HeNB and the second HeNB operate with one of an open mode, a hybrid mod, and a closed mode, the open mode indicating that an HeNB provides services to any user equipments (UEs), the hybrid mode indicating that a closed subscriber group (CSG) cell provides services to its associated CSG member UEs and to non-CSG member UEs, the closed mode indicating that a CSG cell provides services only to its associated CSG member UEs, and wherein each of the first HeNB and the second HeNB has a different closed subscriber group (CSG) identifier (ID).