Radio tele-communication system using TDMA scheme to reduce signal interference

A radio tele-communication system comprising:

• a plurality of base stations;
• a plurality of mobile stations connected to said base stations through radio channels;
• at least one radio frequency being shared by said plurality of base and mobile stations;
• a signal transmitted at the radio frequency having a time frame constituted by a plurality of time-divisionally multiplexed time slots;
• time intervals for detecting timing shifts being set between the plurality of time slots, wherein a specific code is inserted in each of said time intervals;
• and
• each of said base stations and said mobile stations including;
• timing shift detecting means for detecting a communication timing shift in a time slot currently used for communication during a signal reception state in the time intervals for detecting timing shifts, said timing shift detecting means monitoring whether the specific code is detected upon reception of a time slot currently used for communication, and recognizing a communication timing shift of the time slot when the specific code is detected;
• and
• timing correcting means for correcting the communication timing of the corresponding time slot in cooperation with a station, with which communication is performed, on the basis of the communication timing shift detection result obtained by said timing shift detecting means.

A radio tele-communication system comprising:

• a plurality of base stations;
• a plurality of mobile stations connected to said base stations through radio channels;
• at least one radio frequency being shared by said plurality of base and mobile stations;
• a signal transmitted at the radio frequency having a time frame constituted by a plurality of time-divisionally multiplexed time slots;
• time intervals for detecting timing shifts being set between the plurality of time slots;
• and
• each of said base stations and said mobile stations including;
• timing shift detecting means for detecting a communication timing shift in a time slot currently used for communication during a signal reception state in one of the time intervals for detecting timing shifts;
• determining means for checking, on the basis of the communication timing shift detection result obtained by said timing shift detecting means, whether a communication timing of the corresponding time slot can be corrected;
• timing correcting means for correcting the communication timing of the corresponding time slot in cooperation with a station, with which communication is performed, if said determining means determines that the communication timing can be corrected;
• and
• channel changing means for changing the time slot in cooperation with the station with which communication is performed, if said determining means determines that the communication timing cannot be corrected.

A mobile station apparatus used in a radio tele-communication system comprising a plurality of base stations and a plurality of mobile stations connected to said base stations through radio channels, at least one radio frequency being shared by said plurality of base and mobile stations, a signal transmitted at the radio frequency having a time frame constituted by a plurality of time-divisionally multiplexed time slots, and time intervals for detecting timing shifts being set between the plurality of time slots, the apparatus comprising:

• timing shift detecting means for detecting a communication timing shift in a time slot currently used for communication from a reception state in one of the time intervals for detecting timing shifts;
• determining means for checking, on the basis of the communication timing shift detection result obtained by said timing shift detecting means, whether a communication timing of the corresponding time slot can be corrected;
• timing correcting means for correcting the communication timing of the corresponding time slot in cooperation with a station, with which communication is performed, if said determining means determines that the communication timing can be corrected;
• and
• channel changing means for changing the time slot in cooperation with the station with which communication is performed, if said determining means determines that the communication timing cannot be corrected.

A base station apparatus used in a radio telecommunication system including a plurality of base stations and a plurality of mobile stations connected to said base stations through radio channels, at least one radio frequency being shared by said plurality of base and mobile stations, a signal transmitted at the radio frequency having a time frame constituted by a plurality of time-divisionally multiplexed time slots, and time intervals for detecting timing shifts being set between the plurality of time slots, the apparatus comprising:

• timing shift detecting means for detecting a communication timing shift in a time slot currently used for communication from a reception state in one of the time intervals for detecting timing shifts;
• determining means for checking, on the basis of the communication timing shift detection result obtained by said timing shift detecting means, whether a communication timing of the corresponding time slot can be corrected;
• timing correcting means for correcting the communication timing of the corresponding time slot in cooperation with a station, with which communication is performed, if said determining means determines that the communication timing can be corrected;
• and
• channel changing means for changing the time slot in cooperation with the station with which communication is performed, if said determining means determines that the communication timing cannot be corrected.