Radio communication apparatus and transmission rate control method

• US 6,505,035 B2
• Filed: 01/23/2002
• Issued: 01/07/2003
• Est. Priority Date: 04/17/1998
• Status: Expired due to Term

• Current Assignee: INVT SPE LLC (FIG LLC (d/b/a Fortress Investment Group LLC))
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Kato, Osamu, Ue, Toyoki
• Primary Examiner(s): Le, Thanh Cong
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US10/052,261
• Publication Number:
  US 20020077064A1
• Time in Patent Office: 349 Days
• Field of Search: 455/63, 455/67.3, 455/69, 455/522, 370/475, 370/479
• US Class Current: 455/69
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/265 taking into account the quality of service QoS
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

The communication terminal apparatus measures reception quality and reports the measurement result to the base station apparatus, and the base station apparatus switches the transmission rate based on the reported result of the reception quality. In this way, the transmission rate is switched starting at the point in time at which the reception quality of the communication terminal apparatus deteriorates. Furthermore, the transmission rate is switched so that the amount of interference with others is within the allowable range according to the channel condition between the communication terminal apparatus and base station apparatus.

Claims

1. A transmission rate control apparatus comprising:

a reception circuit that receives a retransmission request from a communication terminal, and

a transmission circuit that transmits a received quality report request to the communication terminal at a timing at which the retransmission request is received; and

a transmission rate switching controller that changes a transmission rate to the communication terminal based on the received quality measured at the communication terminal according to the received quality report request,

wherein said transmission rate switching controller decreases the transmission rate when the received quality at a side of the communication terminal deteriorates rapidly.

2. The transmission rate control apparatus according to claim 1, wherein, after said transmission rate switching controller decreases the transmission rate when the received quality at a side of the communication terminal deteriorates rapidly, said transmission rate switching controller changes the transmission rate to an original value when the received quality at the side of the communication terminal subsequently improves.

3. A base station apparatus provided with a transmission rate control apparatus comprising:

a reception circuit that receives a retransmission request from a communication terminal;

a transmission circuit that transmits a received quality report request to the communication terminal at a timing at which the retransmission request is received; and

a transmission rate switching controller that changes a transmission rate to the communication terminal based on the received quality measured at the communication terminal according to the received quality report request,

wherein said transmission rate switching controller decreases the transmission rate when the received quality at a side of the communication terminal deteriorates rapidly.

4. The base station apparatus according to claim 3, wherein, after said transmission rate switching controller decreases the transmission rate when the received quality at a side of the communication terminal deteriorates rapidly, said transmission rate switching controller changes the transmission rate to an original value when the received quality at the side of the communication terminal subsequently improves.

5. A communication terminal apparatus comprising:

received quality measurement circuitry that measures a first received quality of a signal from a base station;

retransmission request circuitry that requests retransmission of said signal based on the first received quality

monitor circuitry that monitors a second received quality of said signal at said communication terminal apparatus;

reception circuitry that receives a received quality report request transmitted from said base station at a timing at which the request for retransmission is received at said base station; and

transmission circuitry that transmits the second received quality to said base station according to the received quality report request.

6. A communication method comprising:

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

requesting retransmission of said signal based on the first received quality;

monitoring a second received quality at said communication terminal apparatus;

receiving a received quality report request transmitted from said base station at a timing at which the request for retransmission is received at said base station; and

transmitting the second received quality to said base station according to the received quality report request.