Patent ID: 9338699
Filing Date: 2016-05-10
CPC Classification: H04W

Claim Text:
1. A method, in a Long Term Evolution (LTE) core network, of retaining a packet switched session during a circuit-switch fallback (CSFB) connection attempt between a wireless terminal and Circuit Switched (CS) core network, comprising: a) receiving a circuit-switch connection request at a node serving said wireless terminal; b) instructing said serving node to release said packet switched session between said wireless terminal and said serving node but delay the release of said packet switched session between said serving node and said LTE core network and initiating a timer hold function indicative of the time limit said wireless terminal's packet switched session is retained and the length of time context and Radio Resource Control (RRC) information associated with said wireless terminal is stored; c) forwarding said circuit switched connection request to said wireless terminal to establish a CSFB session on said CS core network; and d) maintaining said packet switched session until said wireless terminal ends said CSFB session but no later than expiry of said time limit.