Mobile communication system, base station, mobile station, and power-saving transmission and reception method used in them
There is provided a mobile communication system that can prevent a situation in which, although there is no occasion to receive packets for a mobile station, the reception processing is continued and useless power is undesirably consumed. The mobile communication system includes a base station that repeats a transmission period and a transmission halt period with a constant control cycle, and mobile station that repeats a reception period and a reception halt period with a constant control cycle (antenna, duplexer, reception unit, user data separation unit, packet transmission determination unit, reception period determination unit, packet reception determination unit, and signal synthesis unit). The mobile station alternately repeats the reception period and reception halt period, sends the reception result to the base station, and starts the reception period according to the start of the transmission period of the base station to receive packets. In case all the packets cannot be correctly received during the reception period, the reception period is extended by a predetermined period in the control cycle. Furthermore, in case all the packets can be correctly received during the reception period, the mobile station transfers to the reception halt period to halt the reception.
1. A mobile station which communicates with a base station using a radio channel, the mobile station comprising:
a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted;
a transmission unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal;
a packet reception determination unit configured to determine a packet reception fault; and
a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit;
wherein, if the packet reception period is extended, the packet reception halt period following the packet reception period is shortened.
2. The mobile station according to claim 1 , wherein the packet reception period and the packet reception halt period are alternately repeated.
3. The mobile station according to claim 2 , wherein the packet reception period and the packet reception halt period comprise a periodic control cycle having a fixed period.
4. The mobile station according to claim 1 , wherein the packet reception period is further extended if another packet reception fault is determined during a retransmission.
5. A mobile communication system comprising:
a base station; and
a mobile station
wherein the base station comprises:
a setting unit configured to set a radio channel between the base station and the mobile station; and
a communication unit configured to communicate with the mobile station using the radio channel;
wherein the mobile station comprises:
a switching unit configured to switch from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted;
a transmitting unit configured to transmit, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal;
a packet reception determination unit configured to determine a packet reception fault; and
a reception period determination unit configured to extend the packet reception period if the packet reception fault is determined by the packet reception determination unit;
wherein, if the packet reception period is extended, the packet reception halt period following the packet reception period is shortened.
6. The mobile communication system according to claim 5 , wherein the packet reception period and the packet reception halt period are alternately repeated.
7. The mobile communication system according to claim 6 , wherein the packet reception period and the packet reception halt period comprise a periodic control cycle having a fixed period.
8. The mobile communication system according to claim 5 , wherein the packet reception period is further extended if another packet reception fault is determined during a retransmission.
9. A method for controlling a mobile station which communicates with a base station using a radio channel, the method comprising:
switching from a packet reception period during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted;
transmitting, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal;
determining a packet reception fault; and
extending the packet reception period if the packet reception fault is determined;
wherein, if the packet reception period is extended, the packet reception halt period following the packet reception period is shortened.
10. The method according to claim 9 , wherein the packet reception period and the packet reception halt period are alternately repeated.
11. A method for controlling a mobile communication system which includes at least a base station and a mobile station, the method comprising:
the base station setting a radio channel between the base station and the mobile station;
the base station communicating with the mobile station using the radio channel;
the mobile station switching from a packet reception period, during which packet reception can be executed, to a packet reception halt period, during which packet reception is halted;
the mobile station transmitting, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal;
the mobile station determining a packet reception fault; and
the mobile station extending the packet reception period if the packet reception fault is determined by the mobile station;
wherein, if the packet reception period is extended, the packet reception halt period following the packet reception period is shortened.
12. The method according to claim 11 , wherein the packet reception period and the packet reception halt period are alternately repeated.
13. A non-transitory computer-readable information recording medium storing a program which, when executed by a processor, performs a method for controlling a mobile station which communicates with a base station using a radio channel, the method comprising:
switching from a packet reception period, during which packet reception is can be executed, to a packet reception halt period, during which packet reception is halted;
transmitting, to the base station, a result of receiving a packet sent from the base station, as a reception result notification signal;
determining a packet reception fault; and
extending the packet reception period if the packet reception fault is determined;
wherein, if the packet reception period is extended, the packet reception halt period following the packet reception period is shortened.
14. The non-transitory computer-readable information recording medium according to claim 13 , wherein the packet reception period and the packet reception halt period are alternately repeated.