Patent ID: 7366156

Claim:
A context synchronization method performed in a radio system having a client and server communicating with each other, comprising: performing idle and normal procedures in the client; performing a recovery procedure if an error occurs in performing the idle and normal procedures, the error occurring when the client and server have different context information; and performing a re-attach procedure and an activation procedure according to the error and an error occurring point, wherein performing said recovery procedure includes: transmitting context information managed by the server to the client when the error occurs in the client, to achieve synchronization between the client and server as a result of the client and server having same context information, and transmitting context information managed by the client to the server when the error occurs in the server, to achieve synchronization between the server and client as a result of the server and client having same context information, wherein transmitting the context information to the client or server occurs without performing a power down operation or returning to an initialization state, wherein if the failure occurs in the network, the network receives the context information of the MS by sending a packet paging with an international mobility subscriber identity (IMSI) to the MS so that the received context information of the MS is used as context information of the network, and wherein the context information of the MS received by the network includes INFO-type context information.