Device and method for controlling channel access by access slot reserving in a mobile communication system

A channel access method for a mobile station in a mobile communication system, comprising the steps of:

• (a) receiving access channel reserve information from a Broadcast Control Channel and determining how many access slots on a random access channel are available;
• (b) transmitting via an available access slot an access message including transmission data that provides information to the base station relating to reservation request for succeeding frame data;
• (c) receiving an acknowledge message including a reserving access slot number via a forward access channel when the base station determines that the access message from the mobile station indicates succeeding frame data;
• and
• (d) upon detection of a reserved access channel, transmitting an access channel frame at the reserved access slot.

A channel access device for a base station in a mobile communication system, comprising:

• means for receiving channel access information from a mobile station via a reverse access channel;
• means for examining a length of transmission data, included in the received channel access information, to determine whether the transmission data continues in at least one succeeding frame;
• and
• means for transmitting an acknowledge message including an access slot number which is not currently assigned for other mobile stations via a forward access channel for reservation of the succeeding frame when the examination of the length of transmission data indicates succeeding frame data.

A channel access device for a mobile station in a mobile communication system, comprising:

• means for receiving access channel reserve information from a Broadcast Control Channel and determining how many access slots on a random access channel are available;
• means for transmitting via an available slot an access message including transmission data that provides information relating to reservation request for succeeding frame data;
• means for receiving an acknowledge message including a reserving access slot number via a forward access channel when the base station determines that the access message from the mobile station indicates succeeding frame data;
• and
• means for transmitting an access channel frame at the reserved access slot upon detection of a reserved access channel.