Mobile Station And Wireless Base Station Side Device In Wireless Communication System

• US 20100137007A1
• Filed: 02/01/2010
• Published: 06/03/2010
• Est. Priority Date: 08/10/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: KOJIMA, Yuji
• Granted Patent: US 8,670,805 B2
• Time in Patent Office: Days
• US Class Current: 455/458
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 68/02 Arrangements for increasing efficiency of notification or paging channel
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a system in which a reception (paging) cycle is defined by the number of frames, even if the length of the frames is changed, the power consumption of a mobile station (MS) and a delay in the response at the time of incoming are maintained by changing the paging cycle so that the paging cycles become equal in a time unit. The mobile station for receiving the signal from a wireless base station for each cycle defined by the number of frames to detect an incoming notification has a measurement unit for detecting a change in the frame length of the received frames, a cycle changing unit for, if the change is detected, increasing or decreasing the number of frames which defines the cycle, and an incoming notification monitoring unit for receiving the signal from the wireless base station in accordance with the cycle changed by the cycle changing unit.

Claims

1. A mobile station that detects an incoming notification by receiving a signal from a wireless base station for each cycle defined by a number of frames, the mobile station comprising:

a measurement unit to detect a change in frame length of a reception frame;

a cycle changing unit to change the cycle for monitoring the incoming notification by increasing or decreasing the number of frames that defines the cycle in a case of having detected the change; and

an incoming notification monitoring unit to carry out reception of a signal from the wireless base station in accordance with the cycle changed by the cycle changing unit.

2. The mobile station according to claim 1, wherein

the cycle changing unit transmits an intermittent reception cycle in the form of a paging cycle request to a wireless base station side device so as to be equal to that before the change in frame length in terms of time units when a change in frame length of a reception frame has been detected by the measurement unit, receives an intermittent reception cycle based on the transmitted paging cycle request, and executes change to the received intermittent reception cycle.

3. The mobile station according to claim 1, wherein

the cycle changing unit requests a change in the intermittent reception cycle to a wireless base station side device when the change in frame length of a reception frame has been detected by the measurement unit, receives as a response to the request to change the reception cycle an intermittent reception cycle, from the wireless base station side device, so as to be equal to that before the change in frame length in terms of time units, and executes change to the received intermittent reception cycle.

4. The mobile station according to claim 1, wherein

the cycle changing unit transmits and receives to and from a wireless base station side device a code for specifying a conversion method for executing change to an intermittent reception cycle so as to be equal to that before the change in frame length in terms of time units when a change in frame length of a reception frame has been detected by the measurement unit, and parameters required for the conversion method.

5. The mobile station according to claim 2, wherein

transmission and reception of the paging cycle request between the cycle changing unit and the wireless base station side device are carried out with a ranging message.

6. The mobile station according to claim 3, wherein

transmission of a request to change the intermittent reception cycle from the cycle changing unit to the wireless base station side device, and reception of the intermittent reception cycle from the wireless base station side device are carried out with a ranging message.

7. A mobile station that detects an incoming notification by receiving a signal from a wireless base station for each cycle defined by a number of frames, the mobile station comprising:

a measurement unit to detect a change in frame length of a reception frame;

a changing unit to increase or decrease a reception interval for monitoring the incoming notification in accordance with the cycle in a case of having detected the change; and

an incoming notification monitoring unit to carry out reception of a signal from the wireless base station in accordance with the interval changed by the changing unit.

8. A wireless base station side device that controls a signal for carrying out incoming notification to a mobile station so as to be transmitted with frames arriving for each cycle defined by the number of frames, the wireless base station side device comprising:

a cycle changing unit to acquire a frame length and an incoming notification cycle corresponding to the mobile station, and to set the incoming notification cycle to a shorter cycle in a case where a frame length transmitted by a certain wireless base station differs from the frame length corresponding to the mobile station.

9. A wireless base station side device that controls a signal for carrying out incoming notification to a mobile station so as to be transmitted with frames arriving for each cycle defined by the number of frames, the wireless base station side device comprising:

a cycle changing unit to change an incoming notification cycle for a mobile station of a wireless base station in accordance with an incoming notification cycle change request transmitted from a mobile station that detected a change in frame length.