Patent ID: 8150395

Claim:
A method of communicating data for entering idle-mode in a wireless communication system at a mobile station (MS), the method comprising: receiving, from a network entity, a first de-registration command message for requesting the MS to transmit a de-registration request message and requesting the MS to initiate an idle mode, wherein the first de-registration command message is sent by the network entity in an unsolicited manner; transmitting, by the MS to the network entity, after receiving the first de-registration command message, the de-registration request message including first idle mode retain information to expedite a future network re-entry by the MS from the idle mode; and receiving, from the network entity, a second de-registration command message including second idle mode retain information to indicate information retained by the network entity in response to the de-registration request message, wherein each of the first and second idle mode retain information is associated with a capability of the MS indicated by Bit# 0 , security information indicated by Bit# 1 , registration information indicated by Bit# 2 , and a network address indicated by Bit# 3 .