Patent ID: 9173152
Filing Date: 2015-10-27
Classification: H04W

Abstract:
1. A method of supporting handover by a network node in a mobile communication system, the method comprising: receiving a message related to a handover, including a first parameter indicating a cause for the handover; transmitting a handover command message to a first base station for a terminal to perform a handover to a second base station, when the network node determines that handover is needed based on the cause; receiving a status report message including a second parameter indicating whether or not the cause for handover is solved; and transmitting a reverse handover request message to the second base station for the terminal to perform reverse handover to a target base station, when the network node determines that a reverse handover is needed, wherein the network node determines that the handover is needed, if the first base station is a closed subscriber group (CSG) cell and the cause is an expiry of a CSG membership, wherein the network node determines that the reverse handover is needed, if the cause is an expiry of a CSG membership and the second parameter indicates updating of a CSG membership, and wherein the status report message indicates that the CSG membership for the terminal is re-established.