Method and apparatus for supporting idle mode in mobile communication system

Abstract

A method of a base station (BS) in a mobile communication system to support an idle mode in a wireless communication system is provided. The method includes performing a negotiation procedure for idle mode entry of a mobile station (MS), with the MS, determining whether to operate as a paging controller for the idle mode MS, detecting a packet destined for the MS, and transmitting a message notifying existence of the packet destined for the MS, to at least one other BS in a paging zone of the BS.

What is claimed is: 
     
         1 . A method of a base station (BS) in a mobile communication system, the method comprising:
 performing a negotiation procedure for idle mode entry of a mobile station (MS), with the MS;   determining whether to operate as a paging controller for the idle mode MS;   detecting a packet destined for the idle mode MS; and   transmitting a message notifying existence of the packet destined for the idle mode MS, to at least one other BS in a paging zone of the BS.   
     
     
         2 . The method of  claim 1 , further comprising:
 receiving a message notifying network reentry of the idle mode MS, from a first BS in the paging zone;   generating a tunnel by performing a binding update procedure with the first BS; and   forwarding the packet destined for the idle mode MS to the first BS through the generated tunnel.   
     
     
         3 . The method of  claim 1 , further comprising:
 receiving a message indicating a new paging controller of the idle mode MS, from a first BS in another paging zone; and   transmitting a message comprising context information of the idle mode MS, to the first BS in the other paging zone,   wherein the context information comprises at least one of home address information and session information of the MS.   
     
     
         4 . A method of a base station (BS) in a mobile communication system, the method comprising:
 receiving a message notifying existence of a packet destined for a mobile station (MS), from another BS in a paging zone of the BS;   broadcasting a paging advertisement message notifying existence of the packet destined for the MS;   obtaining information about the another BS operating as a paging controller of the MS by performing a network reentry procedure with the MS;   receiving the packet destined for the MS from the another BS operating as the paging controller of the MS; and   transmitting the received packet to the MS.   
     
     
         5 . The method of  claim 4 , wherein the receiving of the packet destined for the MS from the another BS operating as the paging controller of the MS comprises:
 transmitting a message notifying network reentry of the MS, to the another BS operating as the paging controller of the MS;   receiving context information of the MS, from the another BS;   generating a tunnel by performing a binding update procedure with the another BS; and   receiving the packet destined for the MS from the another BS through the generated tunnel,   wherein the context information comprises at least one of home address information and session information of the MS.   
     
     
         6 . A method of a base station (BS) in a mobile communication system, the method comprising:
 receiving information about another BS operating as a paging controller of a mobile station (MS) by performing a location update procedure with the MS;   determining whether to operate as a new paging controller of the MS; and   transmitting a message indicating that the BS operates as the new paging controller, to the another BS.   
     
     
         7 . The method of  claim 6 , further comprising:
 receiving context information of the MS, from the another BS;   detecting a packet destined for the MS; and   transmitting a message notifying existence of the packet destined for the MS, to at least one other BS in a paging zone of the BS.   
     
     
         8 . A method of a mobile station (MS) in a mobile communication system, the method comprising:
 entering an idle mode by negotiating idle mode entry with a first Base Station (BS);   determining the first BS as a paging controller;   receiving an advertisement message from a second BS;   determining, based on the received advertisement message, whether the MS is in a paging zone of the first BS; and   performing, if the MS is in the paging zone of the first BS, a network reentry procedure with the second BS.   
     
     
         9 . The method of  claim 8 , further comprising:
 performing, if the MS is not in the paging zone of the first BS, a location update procedure with the second BS; and   determining the second BS as a new paging controller.   
     
     
         10 . The method of  claim 8 ,
 wherein the entering of the idle mode by negotiating the idle mode entry comprises:   transmitting a message indicating a previous paging controller of the MS, to the first BS, and   wherein the performing of the location update procedure with the second BS comprises:   transmitting a message indicating that the first BS is a previous paging controller of the MS, to the second BS.   
     
     
         11 . An apparatus of a base station (BS) in a mobile communication system, the apparatus comprising:
 at least one transceiver configured:
 to transmit and receive signals to and from a mobile station (MS), and 
 to transmit and receive signals to and from another BS; and 
   at least one processor configured:
 to perform a negotiation procedure for idle mode entry of the MS, with the MS, 
 to determine whether to operate as a paging controller for the mode in the idle mode, 
 to detect a packet destined for the MS, and 
 to transmit a message notifying existence of the packet destined for the MS, to at least one other BS in a paging zone of the BS. 
   
     
     
         12 . The apparatus of  claim 11 , wherein the at least one processor is further configured:
 to receive a message notifying network reentry of the MS, from a first BS in the paging zone,   to generate a tunnel by performing a binding update procedure with the first BS, and   to forward the packet destined for the MS to the first BS through the generated tunnel.   
     
     
         13 . The apparatus of  claim 11 ,
 wherein the at least one processor is further configured:
 to receive a message indicating a new paging controller of the MS, from a first BS in other paging zone, and 
 to transmit a message comprising context information of the MS, to the first BS in the other paging zone, and 
   wherein the context information comprises at least one of home address information and session information of the MS.   
     
     
         14 . An apparatus of a base station (BS) in a mobile communication system, the apparatus comprising:
 at least one transceiver configured:
 to transmit and receive signals to and from a mobile station (MS), and 
 to transmit and receive signals to and from another BS; and 
   at least one processor configured:
 to receive a message notifying existence of a packet destined for the MS, from the another BS in a paging zone of the BS, 
 to broadcast a paging advertisement message notifying existence of the packet destined for the MS, 
 to obtain information of the another BS operating as a paging controller of the MS by performing a network reentry procedure with the MS, 
 to receive the packet destined for the MS from the another BS operating as the paging controller of the MS, and 
 to transmit the received packet to the MS. 
   
     
     
         15 . The apparatus of  claim 14 ,
 wherein the at least one processor is further configured:
 to transmit a message notifying network reentry of the MS, to the another BS operating as the paging controller of the MS, 
 to receive context information of the MS from the another BS, to generate a tunnel by performing a binding update procedure with the another BS, and 
 to receive the packet destined for the MS from the another BS through the generated tunnel, and 
   wherein the context information comprises at least one of home address information and session information of the MS.   
     
     
         16 . An apparatus of a base station (BS) in a mobile communication system, the apparatus comprising:
 at least one transceiver configured:
 to transmit and receive signals to and from a mobile station (MS), and 
 to transmit and receive signals to and from another BS; 
   at least one processor configured:
 to receive information about the another BS operating as a paging controller of the MS by performing a location update procedure with the MS, 
 to determine whether to operate as a new paging controller of the MS, and 
 to transmit a message indicating that the BS operates as the new paging controller, to the another BS. 
   
     
     
         17 . The apparatus of  claim 16 , wherein the at least one processor is further configured:
 to receive context information of the MS from the another BS,   to detect a packet destined for the MS, and   to transmit a message notifying existence of the packet destined for the MS, to at least one other BS in a paging zone of the BS.   
     
     
         18 . An apparatus of a mobile station (MS) in a mobile communication system, the apparatus comprising:
 at least one transceiver configured to transmit and receive signals to and from a base station (BS); and   at least one processor configured:
 to enter an idle mode by negotiating idle mode entry with a first BS, 
 to determine the first BS as a paging controller, 
 to receive an advertisement message from a second BS, 
 to determine based on the received advertisement message whether the MS is in a paging zone of the first BS, and 
 to perform, if the MS is in the paging zone of the first BS, a network reentry procedure with the second BS. 
   
     
     
         19 . The apparatus of  claim 18 , wherein, if the MS is not in the paging zone of the first BS, the at least one processor is further configured to perform a location update procedure with the second BS and determines the second BS as a new paging controller. 
     
     
         20 . The apparatus of  claim 18 ,
 wherein, if negotiating the idle mode entry, the at least one processor is further configured to transmit a message indicating a previous paging controller of the MS, to the first BS, and   wherein, if performing the location update procedure with the second BS, the at least one processor is further configured to transmit a message indicating that the first BS is a previous paging controller of the MS, to the second BS.