Patent ID: 9042341
Filing Date: 2015-05-26
Classification: H04W

Abstract:
1. A method for performing zone switch carried out by an advanced mobile station (AMS) operating in a first zone of a serving advanced base station (serving ABS) supporting a legacy mobile station (MS), the method comprising: receiving a handover command (AAI-HO-CMD) message indicating zone switching to a second zone of the serving ABS from the first zone, wherein the handover command message is received in the first zone and provides information on a Connection Identifier (CID) to be used by the AMS in the second zone; performing network reentry in the second zone using the information on the CID; receiving an unsolicited ranging response (RNG-RSP) message, indicating zone switching to the first zone from the second zone, in the second zone after the network reentry in the second zone is finished, wherein the unsolicited ranging response (RNG-RSP) message includes zone switching information (ZS TLV) necessary for the AMS to perform the zone switch from the second zone to the first zone; and performing network reentry by transmitting a ranging request (RNG-REQ) message and receiving a ranging response (RNG-RSP) message in the first zone, wherein the first zone supports AMSs and the second zone supports legacy MSs.