RADIO COMMUNICATION TERMINAL DEVICE, RADIO COMMUNICATION BASE STATION DEVICE, AND RADIO COMMUNICATION METHOD

• US 20090186614A1
• Filed: 06/25/2007
• Published: 07/23/2009
• Est. Priority Date: 06/26/2006
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Petrovic, Dragan, Fukui, Akito, Aoyama, Takahisa
• Granted Patent: US 8,121,634 B2
• Time in Patent Office: Days
• US Class Current: 455/436
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]

Abstract

It is possible to provide a radio communication terminal device, a radio communication base station device, and a radio communication method capable of rapidly completing a handover even during DRX/DTX. In the devices and the method, a terminal (100) transmits a quality measurement result to a base station (150) at an Active interval. Here, the terminal (100) sets the DRX/DTX interval to a short interval since performance of a handover is predicted. The base station (150) which has received the quality measurement result transmitted from the terminal (100) recognizes that the terminal has set the DRX/DTX interval to a short interval and transmits a handover instruction to the terminal (100) at the Active interval, considering the shortened DRX/DTX interval.

Claims

1. A radio communication terminal apparatus comprising:

a reception section that receives a signal transmitted from a radio communication base station apparatus;

a quality measurement section that measures quality of the received signal;

a DRX/DTX control section that controls an interval of discontinuous reception and discontinuous transmission based on control information included in the received signal for controlling the interval of discontinuous reception and discontinuous transmission and based on a quality measurement result; and

a transmission section that transmits the quality measurement result to the radio communication base station apparatus.

2. The radio communication terminal apparatus according to claim 1, wherein the DRX/DTX control section changes the interval of discontinuous reception and discontinuous transmission according to various events specified by a relationship between quality of a cell of the radio communication terminal apparatus and quality of another cell.

3. The radio communication terminal apparatus according to claim 1, further comprising a channel quality indicator measurement section that measures a channel quality indicator from the received signal,

wherein the DRX/DTX control section changes the interval of discontinuous reception and discontinuous transmission based on threshold value information for the channel quality indicator included in the received signal and based on the measured channel quality indicator.

4. The radio communication terminal apparatus according to claim 1, further comprising a determination section that determines whether the quality measurement result shows a measurement result of different frequencies in a cell or a measurement result of different frequencies between different cells,

wherein the DRX/DTX control section controls the interval of discontinuous reception and discontinuous transmission based on the quality measurement result only when the quality measurement result shows the measurement result of different frequencies between different cells.

5. The radio communication terminal apparatus according to claim 1, wherein, if a control message is transmitted or received during discontinuous reception and discontinuous transmission, the DRX/DTX control section extends an active period and finishes the discontinuous reception or discontinuous transmission.

6. A radio communication base station apparatus comprising:

a quality measurement result acquisition section that acquires a quality measurement result transmitted from a radio communication terminal apparatus and measured at the radio communication terminal apparatus;

a transmission section that transmits a message including control information for controlling an interval of discontinuous reception and discontinuous transmission based on the acquired quality measurement result to the radio communication terminal apparatus; and

a DRX/DTX control section that controls the interval of discontinuous reception and discontinuous transmission of the radio communication base station apparatus in accordance with the interval of discontinuous reception and discontinuous transmission changed at the radio communication terminal apparatus, based on the acquired quality measurement result and the control information.

7. The radio communication base station apparatus according to claim 6, further comprising:

a channel quality indicator acquisition section that acquires a channel quality indicator transmitted from a radio communication terminal apparatus and measured at the radio communication terminal apparatus; and

a transmission section that transmits a message including threshold value information for the channel quality indicator for controlling the interval of discontinuous reception and discontinuous transmission based on the acquired channel quality indicator result,

wherein the DRX/DTX control section changes the interval of discontinuous reception and discontinuous transmission of the radio communication base station apparatus based on the acquired channel quality indicator and the threshold value information for the channel quality indicator transmitted from the radio communication terminal apparatus.

8. The radio communication base station apparatus according to claim 6, wherein, if a control message is transmitted or received during discontinuous reception and discontinuous transmission, the DRX/DTX control section extends an active period and finishes the discontinuous reception or discontinuous transmission.

9. A radio communication method comprising:

measuring quality of a signal received from a radio communication base station apparatus at a radio communication terminal apparatus;

controlling an interval of discontinuous reception and discontinuous transmission of the radio communication terminal apparatus based on first control information for controlling the interval of discontinuous reception and discontinuous transmission and based on the quality measurement result;

transmitting the quality measurement result to the radio communication base station apparatus;

acquiring at the radio communication base station apparatus the quality measurement result measured at the radio communication terminal apparatus;

transmitting a message including second control information for controlling the interval of discontinuous reception and discontinuous transmission based on the acquired quality measurement result, to the radio communication terminal apparatus; and

controlling the interval of discontinuous reception and discontinuous transmission of the radio communication base station apparatus in accordance with the interval of discontinuous reception and discontinuous transmission changed at the radio communication terminal, based on the acquired quality measurement result and the second control information.