Patent ID: 9681291
Date: 2017-06-13
CPC Classifications: H04W

Claim:
1. A method for deciding activation of Idle State Signaling Reduction (ISR), comprising: obtaining, by a Serving General Packet Radio Service (GPRS) Support Node (SGSN), subscriber data of a User Equipment (UE); and activating, by the SGSN, ISR for the UE if the SGSN determines that the subscriber data of the UE comprises Circuit Switched (CS) domain subscriber data and the SGSN determines that all of the following conditions are satisfied: an indicator of a Home Subscriber Server (HSS) for a support of the Short Message Service in the SGSN (SMSinSGSN) feature is received, it is determined that an SMS-only Request message is carried in a Routing Area Update (RAU) Request message of the UE, and the SGSN supports the SMSinSGSN feature.