Mobile radio communication system capable of avoiding an interference due to collision of radio signals and apparatuses used therein

Claim 2

A mobile radio communication system comprising first base station assigned to a first service zone, a counterpart mobile station present within said first service zone to communicate with said first base station, and a second base station assigned to a second service zone adjacent to said first service zone, said first and said second base stations being assigned with a control channel frequency in common, wherein: said first base station comprises: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to said counterpart mobile station with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to said counterpart mobile station with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to said counterpart mobile station with said previous time duration inserted in said previous one of the control information signals; said counterpart mobile station comprising: control information receiving means for selectively receiving said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by said control information receiving means.

Claim 3

A mobile radio communication system comprising first and second base stations assigned to first and second service zones adjacent to each other and first and second mobile stations present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, wherein: each of said first and said second base stations comprises: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; the counterpart mobile station of each of said first and said second base stations comprising: control information receiving means for selectively receiving said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by said control information receiving means.

Claim 4

A mobile radio communication system comprising first and second base stations assigned to first and second service zones adjacent to each other and first and second mobile stations present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, wherein: each of said first and said second base stations comprises: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; the counterpart mobile station of each of said first and said second base stations comprising: control information receiving means for selectively receiving said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by said control information receiving means.

Claim 5

A base station apparatus for use in each of first and second base stations of a mobile radio communication system in which said first and said second base stations assigned to first and second service zones adjacent to each other and which comprises first and second mobile stations present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, said base station apparatus comprising: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; said base station apparatus thereby making the counterpart mobile station of each of said first and said second base stations selectively receive said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by the counterpart mobile station of each of said first and said second base stations.

Claim 6

A base station apparatus for use in each of first and second base stations of a mobile radio communication system in which said first and said second base stations assigned to first and second service zones adjacent to each other and which comprises first and second mobile stations present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, said base station apparatus comprising: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; said base station apparatus thereby making the counterpart mobile station of each of said first and said second base stations selectively receive said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by the counterpart mobile station of each of said first and said second base stations.

Claim 7

A mobile station apparatus for use in each of first and second mobile stations of a mobile radio communication system comprising first and second base stations assigned to first and second service zones adjacent to each other, said first and said second mobile stations being present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, each of said first and said second base stations comprising: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; said mobile station apparatus for use in the counterpart mobile station of each of said first and said second base stations comprising: control information receiving means for selectively receiving said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by said control information receiving means, said control information receiving means producing said current one of the control information signals except said following time duration after said control information receiving means produces said previous one of the control information signals except said previous following time duration; and operation control means connected to said control information receiving means for controlling operation of said mobile station apparatus in response to said current one of the control information signals except said following time duration after said operation control means controls operation of said mobile station apparatus in response to said previous one of the control information signals except said previous following time duration.

Claim 8

A mobile station apparatus for use in each of first and second mobile stations of a mobile radio communication system comprising first and second base stations assigned to first and second service zones adjacent to each other, said first and said second mobile stations being present within said first and said second service zones as counterpart mobile stations of said first and said second base stations to communicate with said first and said second base stations, respectively, said first and said second base stations being assigned with a control channel frequency in common, each of said first and said second base stations comprising: control information transmitting means for intermittently transmitting control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with a time duration left between two adjacent ones of said control information signals; time duration determining means for randomly determining, as a following time duration, the time duration between a current one of said control information signals and a following one of said control information signals so that said following time duration randomly varies from a previous time duration which is previously determined between said current one of the control information signals and a previous one of said control information signals by said time duration determining means, said following one of the control information signals following said current one of the control information signals, said previous one of the control information signals preceding said current one of the control information signals; and transmission control means connected to said time duration determining means and said control information transmitting means for controlling said control information transmitting means so that said control information transmitting means transmits said current one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said following time duration inserted in said current one of the control information signals after said control information transmitting means transmits said previous one of the control information signals by the use of said control channel frequency to the counterpart mobile station of each of said first and said second base stations with said previous time duration inserted in said previous one of the control information signals; said mobile station apparatus for use in the counterpart mobile station of each of said first and said second base stations comprising: control information receiving means for selectively receiving said current one of the control information signals and said following time duration inserted in said current one of the control information signals by the use of the control channel frequency in accordance with said previous time duration which is inserted in said previous one of the control information signals and which is previously and selectively received by said control information receiving means, said control information receiving means producing said current one of the control information signals except said following time duration after said control information receiving means produces said previous one of the control information signals except said previous following time duration; and operation control means connected to said control information receiving means for controlling operation of said mobile station apparatus in response to said current one of the control information signals except said following time duration after said operation control means controls operation of said mobile station apparatus in response to said previous one of the control information signals except said previous following time duration.