MOBILE COMMUNICATION SYSTEM, BASE STATION, MOBILE STATION, AND POWER-SAVING TRANSMISSION AND RECEPTION METHOD USED IN THEM

• US 20090161587A1
• Filed: 10/26/2006
• Published: 06/25/2009
• Est. Priority Date: 10/28/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ishii, Naoto, Lee, Jinsock
• Granted Patent: US 8,130,685 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04L 1/1829 Arrangements specially adapted for the receiver end
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 49/555 Error detection
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

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.

Claims

1-16. -16. (canceled)

17. A mobile communication system, comprising:

a base station; and

a mobile station, wherein a radio channel is set between the base station and the mobile station,

said base station alternately repeating a packet transmission period during which packets are transmitted and a packet transmission halt period during which transmission of the packets is halted with a predetermined control cycle at the time of the packet communication using the radio channel, and, after transmitting packets to the mobile station, determining whether or not retransmission packets should be transmitted based on a reception result notification signal from the mobile station,

said mobile station alternately repeating a packet reception period during which the packets are received and a packet reception halt period during which reception of the packets is halted with a predetermined control cycle at the time of the packet communication using the radio channel, and sending the reception result with respect to the packets to the base station as the reception result notification signal,

said base station including

packet retransmission means for transmitting the retransmission packets with the packet transmission period extended in the control cycle based on the reception result notification signal, and

said mobile station including

packet reception means for receiving the packets by starting the packet reception period according to the start of the packet transmission period of the base station,

reception period extension means for extending the packet reception period in the control cycle based on the reception result with respect to the packets received during the packet reception period, and

packet reception halt means for halting the packet reception by switching from the packet reception period to the packet reception halt period in the control cycle based on the reception result,

said reception period extension means including

means for extending the packet reception period by a predetermined time period in the control cycle when receiving the packets faultily, and

means for further extending the packet reception period in the control cycle when the extended packet reception period is shorter than a predetermined reception period.

18. The mobile communication system according to claim 17, wherein

said packet reception halt means notifies that the packets are correctly received as the reception result notification signal, and switches from the packet reception period to the packet reception halt period in the control cycle when the packets received during the packet reception period are correctly received and halts the packet reception.

19. The mobile communication system according to claim 17, wherein

said packet communication using the radio channel is a packet communication by a predetermined service.

20. The mobile communication system according to claim 19, wherein

said base station further includes

means for sending a packet reception halt notification signal to the mobile station when switching to the packet transmission halt period at the time of the packet communication by a service other than the predetermined service, and

said mobile station further includes

means for halting the packet reception by switching from the packet reception period to the packet reception halt period in case of receiving the packet reception halt notification signal at the time of the packet communication by a service other than the predetermined service.

21. The mobile communication system according to claim 19, wherein

the packet communication by the predetermined service is a real-time communication.

22. The mobile communication system according to claim 17, wherein

the packet reception period is dynamically changed between a predetermined minimum reception period and a predetermined maximum reception period under the condition that the control cycle is constant.

23. The mobile communication system according to claim 22, wherein

the maximum reception period is equal to the control cycle or lower.

24. A base station of a mobile communication system,

said base station alternately repeating a packet transmission period during which packets are transmitted and a packet transmission halt period during which transmission of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the base station and a mobile station, and, after transmitting packets to the mobile station, determining whether or not retransmission packets should be transmitted based on a reception result notification signal from the mobile station,

said base station comprising:

packet retransmission means for transmitting the retransmission packets with the packet transmission period extended in the control cycle based on the reception result notification signal.

25. A mobile station of a mobile communication system,

said mobile station alternately repeating a packet reception period during which packets are received and a packet reception halt period during which reception of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the mobile station and a base station, and sending the reception result with respect to the packets sent from the base station to the base station as a reception result notification signal,

said mobile station comprising:

packet reception means for receiving the packets in the packet reception period according to the start of a packet transmission period of the base station;

reception period extension means for extending the packet reception period in the control cycle based on the reception result with respect to the packets received during the packet reception period; and

packet reception halt means for halting the packet reception by switching from the packet reception period to the packet reception halt period in the control cycle based on the reception result,

said reception period extension means including

means for extending the packet reception period by a predetermined time period in the control cycle when receiving the packets faultily, and

means for further extending the packet reception period in the control cycle when the extended packet reception period is shorter than a predetermined reception period.

26. A power-saving transmission and reception method for a mobile communication system, comprising:

setting a radio channel between a base station and a mobile station,

at the base station,

alternately repeating a packet transmission period during which packets are transmitted and a packet transmission halt period during which transmission of the packets is halted with a predetermined control cycle at the time of the packet communication using the radio channel, and, after transmitting packets to the mobile station, determining whether or not retransmission packets should be transmitted based on a reception result notification signal;

at the mobile station,

alternately repeating a packet reception period during which the packets are received and a packet reception halt period during which reception of the packets is halted with a predetermined control cycle at the time of the packet communication using the radio channel, and sending the reception result with respect to the packets to the base station as the reception result notification signal,

at the base station,

transmitting the retransmission packets with the packet transmission period extended in the control cycle based on the reception result notification signal;

at the mobile station,

receiving the packets in the packet reception period according to the start of the packet transmission period of the base station;

extending the packet reception period in the control cycle based on the reception result with respect to the packets received during the packet reception period; and

halting the packet reception by switching from the packet reception period to the packet reception halt period in the control cycle based on the reception result,

said extending step including

extending the packet reception period by a predetermined time period in the control cycle when receiving the packets faultily, and

further extending the packet reception period in the control cycle when the extended packet reception period is shorter than a predetermined reception period.

27. A power-saving transmission and reception method for a base station, comprising:

alternately repeating a packet transmission period during which packets are transmitted and a packet transmission halt period during which transmission of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the base station and a mobile station, and, after transmitting the packets to the mobile station, determining whether or not retransmission packets should be transmitted based on a reception result notification signal from the mobile station; and

transmitting the retransmission packets with the packet transmission period extended in the control cycle based on the reception result notification signal.

28. A power-saving transmission and reception method for a mobile station, comprising:

alternately repeating a packet reception period during which packets are received and a packet reception halt period during which reception of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the mobile station and a base station, and sending the reception result with respect to the packets sent from the base station to the base station as a reception result notification signal;

receiving the packets in the packet reception period according to the start of a packet transmission period of the base station;

extending the packet reception period in the control cycle based on the reception result with respect to the packets received during the packet reception period; and

halting the packet reception by switching from the packet reception period to the packet reception halt period in the control cycle based on the reception result,

said extending step including

extending the packet reception period by a predetermined time period in the control cycle when receiving the packets faultily, and

further extending the packet reception period in the control cycle when the extended packet reception period is shorter than a predetermined reception period.

29. A power-saving transmission and reception program for a base station,

said base station alternately repeating a packet transmission period during which packets are transmitted and a packet transmission halt period during which transmission of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the base station and a mobile station, and, after transmitting the packets to the mobile station, determining whether or not retransmission packets should be transmitted based on a reception result notification signal from the mobile station,

said program enabling a computer to execute:

a step of transmitting the retransmission packets with the packet transmission period extended in the control cycle based on the reception result notification signal.

30. A power-saving transmission and reception program for a mobile station,

said mobile station alternately repeating a packet reception period during which packets are received and a packet reception halt period during which reception of the packets is halted with a predetermined control cycle at the time of the packet communication using a radio channel which is set between the mobile station and a base station, and sending the reception result with respect to the packets sent from the base station to the base station as a reception result notification signal,

said program enabling a computer to execute:

a step of receiving the packets in the packet reception period according to the start of a packet transmission period of the base station;

a step of extending the packet reception period in the control cycle based on the reception result with respect to the packets received during the packet reception period; and

a step of halting the packet reception by switching from the packet reception period to the packet reception halt period in the control cycle based on the reception result,

said the step of extending including

a step of extending the packet reception period by a predetermined time period in the control cycle when receiving the packets faultily, and

a step of further extending the packet reception period in the control cycle when the extended packet reception period is shorter than a predetermined reception period.