Wireless communication system, its base station and mobile station, communication synchronization management method and timer control program therefor

A mobile station which communicates with a base station, the mobile station comprising:

• a control unit which judges whether an uplink signal to the base station is synchronized based on a period sent from the base station be capable of setting the period specific to the mobile station, wherein the control unit receives the period from the base station upon RRC establishment or RRC re-establishment.

A method of controlling a base station which communicates with a mobile station, the method comprising:

• setting a period for judging whether an uplink signal from one of the mobile stations is synchronized, wherein the timer unit is capable of setting the period specific to the mobile station;
• and
• notifying the period to the mobile station upon RRC establishment or RRC re-establishment.

A method of controlling a mobile station which communicates with a base station, the method comprising:

• judging whether an uplink signal to the base station is synchronized based on a period which is sent from the base station is capable of setting the period specific to the mobile station;
• and
• receiving the period from the base station upon RRC establishment or RRC re-establishment.