Mobile communication system and control station

A mobile communication system comprising:

• a control station in communications with a base station and a mobile station, wherein the control station is configured to establish a first dedicated channel as a communicating dedicated channel with the mobile station via the base station;
• and
• the control station comprises:
• a dedicated channel control portion configured to establish a second dedicated channel that is a different dedicated channel than the first dedicated channel during communication through the first dedicated channel such that both the first and the second dedicated channels are retained for a predetermined time period after establishment of the second dedicated channel;
• and
• a mode setting portion configured to establish a dedicated channel retention mode to activate the dedicated channel control portion in response to receipt of a radio resource present notification, wherein the dedicated control portion is configured to change over from the first dedicated channel to the second dedicated channel as the communicating dedicated channel;
• and
• the mode setting portion further configured to establish a timing specification mode to inform the base station and the mobile station of a dedicated channel changeover timing in response to receipt of a radio resource absent notification.

A mobile communication system comprising:

• a control station, a base station, and a mobile station, wherein the control station is configured to establish a first dedicated channel with the mobile station via the base station;
• and the control station is further configured to establish a second dedicated channel that is different from the first dedicated channel, during communication through the first dedicated channel, and the control station is further configured to retain both the first dedicated channel and the second dedicated channel for a predetermined time period after the second dedicated channel is established;
• and
• the control station is further configured to communicate through the first and the second dedicated channels for a period of time that commences upon establishment of the second dedicated channel until reception of one of a dedicated channel changeover completion notification or a changeover failure notification.

A mobile communication system comprising:

• a mobile station in communication with a base station, wherein the mobile station is configured to communicate through a first dedicated channel;
• the base station in communication with a control station wherein the control station is configured to establish, via the base station, a second dedicated channel for the mobile station that is different from the first dedicated channel, wherein the control station is further configured to retain the first dedicated channel and second dedicated channel for a predetermined time period after the second dedicated channel is established;
• wherein the mobile station is further configured to communicate through both the first dedicated channel and the second dedicated channel for the predetermined time period;
• and
• the control station is further configured to receive a radio resource indication, and the control station is further configured to establish a time limit specification in response to receipt of the radio resource indication, wherein the time limit specification informs the base station and the mobile station of a dedicated channel changeover timing in response to a radio resource absent notification.

A method to control a communication system comprising:

• a control station establishing a first dedicated channel for a mobile station;
• the control station receiving a service request from the mobile station;
• the control station transmitting a dedicated changeover preparation request to a base station;
• the control station receiving a second dedicated channel availability indication, wherein the second dedicated channel availability indication indicates a second dedicated channel is available;
• and
• the control station activating the second dedicated channel in response to the secondary dedicated channel available indication, wherein the first dedicated channel and the second dedicated channel are simultaneously active for a predetermined time period following activation of the second dedicated channel.

A control station in eoniinunications with a base station and a mobile station, the control station comprising:

• the control station configured to establish a first dedicated channel as a communicating dedicated channel with the mobile station;
• and
• a dedicated channel control portion configured to establish a second dedicated channel that is a different dedicated channel than the first dedicated channel during communication through the first dedicated channel such that both the first and the second dedicated channels are retained for a predetermined time period after establishment of the second dedicated channel;
• and
• a mode setting portion configured to establish a dedicated channel retention mode to activate the dedicated channel control portion in response to receipt of a radio resource present notification, wherein the dedicated control portion is configured to change over from the first dedicated channel to the second dedicated channel as the communicating dedicated channel;
• and
• the mode setting portion further configured to establish a timing specification mode to inform the base station and the mobile station of a dedicated channel changeover timing in response to receipt of a radio resource absent notification.