Circuit Switched/Packet Switched (CS/PS) Coordination in a Shared Network

摘要

The embodiments herein relate to a method in a RAN node for determining which operator that should serve a device when it has been handed over from a source network to a target shared network. When the device has been handed over to the target shared network, the RAN node transmits, to a non-registered CN node in a non-registered domain, a request for an identity of the device. The RAN node transmits a request, to CN nodes in a registered domain, for a serving operator which has registered the device. The RAN node receives information indicating the serving operator. The RAN node determines that the same serving operator which served the identified device in the registered domain should also serve the device in the non-registered domain.

主权项

1. A method for registering a user equipment (UE) in a first domain after a handover of the UE to a shared radio access network (RAN) has completed, wherein the shared RAN is shared by a plurality of core network operators (CNOs) including a first CNO and a second CNO, and wherein, at the time the handover has completed, the UE is registered in a second domain different than the first domain, the method comprising:
a RAN node of the shared RAN receiving from the UE a first message comprising a non-access stratum (NAS) message; after receiving the first message, the RAN node of the shared RAN transmitting to a first core network (CN) node operating in the first domain a second message, wherein the second message does not include an international mobile subscriber identity (IMSI) of the UE; the RAN node of the shared RAN receiving a third message transmitted by the first CN node in response to the second message, said third message comprising the IMSI of the UE; after receiving the third message, the RAN node of the shared RAN transmitting to a second CN node operating in the second domain a fourth message comprising the IMSI of the UE, wherein the second CN node is operated by the first CNO; the RAN node of the shared RAN receiving a fifth message transmitted by the second CN node in response to the fourth message, said fifth message indicating that the first CNO serves the UE; as a result of receiving the fifth message indicating that the first CNO serves the UE, the RAN node of the shared RAN selecting a CN node in the first domain that is operated by the first CNO; and the RAN node of the shared RAN transmitting to the selected CN node in the first domain a sixth message comprising the NAS message.