Radio communication terminal device, radio communication base station device, and radio communication method

• US 8,121,634 B2
• Filed: 06/25/2007
• Issued: 02/21/2012
• 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: Aoyama, Takahisa, Fukui, Akito, Petrovic, Dragan
• Primary Examiner(s): LE, DANH C
• Application Number:
  US12/306,596
• Publication Number:
  US 20090186614A1
• Time in Patent Office: 1,702 Days
• Field of Search: 455/550.1, 455/434, 455/436, 370/327
• US Class Current: 455/550.1
• 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 discontinuous reception control section that controls a length of an inactive period of discontinuous reception based on control information included in the received signal and based on transmission of a transmission signal to the radio communication base station; and

a transmission section that transmits the transmission signal to the radio communication base station apparatus,

wherein the control information included in the received signal indicates a short length for controlling the inactive period of the discontinuous reception, and the discontinuous reception control section uses the short length for controlling the inactive period of discontinuous reception after the transmission of the transmission signal.

2. The radio communication terminal apparatus according to claim 1, wherein the transmission signal comprises a transmission of a quality measurement result to the radio communication base station apparatus.

3. The radio communication terminal apparatus according to claim 2, wherein the discontinuous reception control section controls the length of the inactive period of discontinuous reception according to various events specified by a relationship between the communication quality of a cell of the radio communication terminal apparatus and the communication quality of another cell.

4. The radio communication terminal apparatus according to claim 2, further comprising:

a channel quality indicator measurement section that measures a channel quality indicator from the received signal, wherein;

the discontinuous reception control section controls the length of the inactive period of discontinuous reception based on threshold value information for the channel quality indicator included in the received signal and based on the measured channel quality indicator.

5. The radio communication terminal apparatus according to claim 2, 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 discontinuous reception control section controls the length of the inactive period of discontinuous reception based on the quality measurement result only when the quality measurement result shows the measurement result of different frequencies between different cells.

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

7. 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 to the radio communication terminal apparatus, the message including control information for controlling a length of an inactive period of discontinuous reception at the radio communication terminal apparatus, based on the acquired quality measurement result; and

a discontinuous reception control section that controls a length of an inactive period of discontinuous reception of the radio communication base station apparatus, based on the acquired quality measurement result, in accordance with the length of the inactive period of discontinuous reception controlled at the radio communication terminal apparatus, based on the control information,

wherein the control information included in the received signal indicates a short length for controlling the inactive period of the discontinuous reception.

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

a channel quality indicator acquisition section that acquires a channel quality indicator transmitted from the 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 length of the inactive period of discontinuous reception based on the acquired channel quality indicator, wherein;

the discontinuous reception control section controls the length of the inactive period of discontinuous reception 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.

9. The radio communication base station apparatus according to claim 7, wherein, if a control message is transmitted or received during discontinuous reception, the discontinuous reception control section extends an active period and finishes the discontinuous reception.

10. 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 a length of an inactive period of discontinuous reception of the radio communication terminal apparatus based on first control information for controlling the length of the inactive period of discontinuous reception 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 to the radio communication terminal apparatus a message including second control information, for controlling the length of the inactive period of discontinuous reception of the radio communication terminal apparatus, based on the acquired quality measurement result; and

controlling the length of an inactive period of discontinuous reception of the radio communication base station apparatus, based on the acquired quality measurement result, in accordance with the length of the inactive period of discontinuous reception controlled at the radio communication terminal apparatus, based on the second control information,

wherein the first and second control information each indicate a short length for controlling the inactive period of the discontinuous reception.