Patent ID: 8467786

Claim:
A method of identifying a cell accessible to a communication device for communication and of providing a service to the communication device via the identified cell in a communication system having a plurality of cells arranged in a plurality of location areas, each location area including at least one macro cell served by a base station and at least one private cell served by a private base station, the base station being controlled by a Mobile Switching Centre, MSC, the at least one private cell being arranged for providing a communication link between the communication device and an IP Multimedia Subsystem, IMS, network, the method comprising: when the communication device is in an idle mode in a location area having a private base station by which the communication device is registered with the IMS network, receiving an invitation for initiating a service with the communication device at the private base station; in response to receiving the invitation, sending by the private base station paging messages for the communication device via the private cell served by the private base station and an invite message to the MSC; in response to receiving the invite message, sending paging messages by the MSC for the communication device via the at least one macro cell; receiving a response to the paging message from the communication device, the response being received via the private cell or the at least one macro cell, the private cell or the at least one macro cell then being identified as a cell accessible to the communication device for communication; and providing the service to the communication device via the identified cell.