Radio base station, communications program and communications method
A radio base station of the present invention includes a vacant channel quantity monitor and a channel controller. The vacant channel quantity monitor monitors whether or not the number of vacant channels, which is the number of channels not in use, reaches a predetermined threshold value. The channel controller releases at least a part of the channels being used for diversity radio communications, in a case where vacant channel quantity monitor detects the number of vacant channels reaches the predetermined threshold value.
1 . A radio base station which carries out diversity radio communications with a mobile station by using a plurality of channels defined by time slots and radio frequencies, the radio base station comprising:
a vacant channel quantity monitor configured to monitor whether or not the number of vacant channels, which is the number of channels not in use, reaches a predetermined threshold value; and
a channel controller configured to release at least a part of the channels being used for the diversity radio communications in a case where the vacant channel quantity monitor detects that the number of vacant channels reaches the predetermined threshold value.
2 . The radio base station according to claim 1 , wherein the channel controller determines a channel to be released based on a receiving communication quality of a signal received from the mobile station.
3 . The radio base station according to claim 2 , wherein
in a case where the diversity radio communications are activated with a plurality of mobile stations, the channel controller selects a mobile station having a highest average of the receiving communication quality of signals received through channels allocated to the plurality of mobile stations respectively, and
the channel controller releases a channel of which the receiving communication quality is lowest within the plurality of channels being used with the selected mobile station.
4 . A communications program used on a communications device for carrying out diversity radio communications with a mobile station by using a plurality of channels defined by time slots and radio frequencies, the communications program causing the communications device to execute:
a vacant channel quantity monitoring procedure for monitoring whether or not the number of vacant channels, which is the number of channels not in use, reaches a predetermined threshold value; and
a channel controlling procedure for releasing at least a part of the channels being used for the diversity radio communications, in a case where it is detected that the number of vacant channels reaches the predetermined threshold value at the vacant channel quantity procedure.
5 . The communications program according to claim 4 , wherein the channel controlling procedure includes determining a channel to be released based on a receiving communication quality of a signal received from the mobile station.
6 . The communications program according to claim 5 , wherein in a case where the diversity radio communications are activated with a plurality of mobile stations, the channel controlling procedure includes:
selecting a mobile station having a highest average of the receiving communication quality of signals received through channels allocated to the plurality of mobile stations respectively; and
releasing a channel of which the receiving communication quality is lowest within the plurality of channels being used with the selected mobile station.
7 . A communications method for carrying out diversity radio communications with a mobile station by using a plurality of channels defined by time slots and radio frequencies, the communications method comprising the steps of:
monitoring whether or not the number of vacant channels, which is the number of the channels not in use, reaches a predetermined threshold value; and
releasing at least a part of the channels being used for the diversity radio communications, in a case where it is detected that the number of vacant channels reaches the predetermined threshold value at the monitoring step.
8 . The communications method according to claim 7 , wherein the releasing step includes determining a channel to be released based on a receiving communication quality of a signal received from the mobile station.
9 . The communications method according to claim 8 , wherein in a case where the diversity radio communications are activated with a plurality of mobile stations, the step of releasing the channel includes:
selecting a mobile station having a highest average of the receiving communication quality of signals received through channels allocated to the plurality of mobile stations respectively; and
releasing a channel of which the receiving communication quality is lowest within the plurality of channels being used with the selected mobile station.