Patent ID: 8626205

Claim:
An apparatus for use in controlling access by a user equipment to at least one cell in a communication network, the apparatus comprising at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to: store in a memory a list of a plurality of Closed Subscriber Group identifiers (CSG ID) corresponding to the at least one cell to which the apparatus is authorized to access, the plurality of Closed Subscriber Group identifiers (CSG ID) corresponding to at least one cell to which the apparatus is authorized to access; while being served by the at least one cell in respect of a first CSG ID during a first predetermined time period, receive a transmission comprising a second, different, CSG ID for use by the cell in a second predetermined time period following expiration of the first predetermined time period; and compare the received second CSG ID with CSG IDs on the list to determine whether the apparatus is authorized to continue to be served by the cell during the second predetermined time period, whereby when the apparatus is determined to be authorized to continue to be served by the cell during the second predetermined time period, the apparatus is then served by the cell using the second CSG ID, and whereby the first CSG ID is the only CSG ID used by the apparatus during the first predetermined time period and the second CSG ID is the only CSG ID used by the apparatus during the second predetermined time period, wherein the transmission is a paging message and the comparing of the received second CSG ID with CSG IDs is performed only after and in response to reception of the paging message comprising the second, different, CSG ID.