Patent ID: 7158495
Filing Date: 2007-01-02
Classification: H04W

Abstract:
1. A method of transmitting and receiving packet data between a base station and a mobile station in a mobile communication system using an uplink/downlink state flag (UDSF), comprising the steps of: requesting a packet channel from the mobile station to the base station; determining if the packet channel is available by monitoring the state of a radio link in the base station, and transmitting a Packet Uplink Assignment message including the UDSF from the base station to the mobile station if the packet channel is available; and monitoring by the mobile station the UDSF of the Packet Uplink Assignment message to determine if a downlink state flag is set, and if the downlink state flag is set, releasing a packet idle mode and directly setting a dedicated mode in the packet idle mode-released state after completely transmitting uplink packet data, and transmitting downlink packet data using the base station and the dedicated mode.