Packet communication method, mobile station, and radio base station

A mobile station, comprising:

• a random access request transmitter unit configured to transmit a random access request to a radio base station through a random access channel;
• a response receiver unit configured to receive, from the radio base station, a response for notifying a receipt of the random access request, and for notifying a packet access request transmission radio resource for transmitting a packet access request for requesting an initiation of a packet communication, through at least one of a downlink shared data channel and a downlink shared control channel corresponding to the random access channel;
• and
• a packet access request transmitter unit configured to transmit the packet access request by using the packet access request transmission radio resource notified by the response received at the response receiver unit.

A radio base station, comprising:

• a random access request receiver unit configured to receive a random access request from a mobile station through a random access channel;
• an allocation unit configured to allocate, at the mobile station, a packet access request transmission radio resource for transmitting a packet access request for requesting an initiation of a packet communication, from among radio resources allocated to uplink shared channels, in response to a receipt of the random access request;
• and
• a response transmitter unit configured to transmit, to the mobile station, a response for notifying the receipt of the random access request, and for notifying the packet access request transmission radio resource, through at least one of a downlink shared data channel and a downlink shared control channel corresponding to the random access channel.