Radio communication device and method of controlling transmission rate

• US 6,400,929 B1
• Filed: 12/06/1999
• Issued: 06/04/2002
• Est. Priority Date: 04/17/1998
• Status: Expired due to Term

• Current Assignee: INVT SPE LLC (SoftBank Group Corp.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiramatsu, Katsuhiko, Kato, Osamu, Ue, Toyoki
• Primary Examiner(s): Hunter, Daniel
• Assistant Examiner(s): Gantt, Alan T.
• Application Number:
  US09/424,843
• Time in Patent Office: 911 Days
• Field of Search: 455/69, 455/67.1, 455/67.4, 455/63, 455/422, 455/517, 370/465, 370/468
• 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 radio communication apparatus having radio transmitting means and radio receiving means, said apparatus comprising:

transmission power control means for increasing or decreasing transmission power of said transmitting means according to transmission power control information received by said receiving means;

average transmission power calculating means for calculating an average value of the transmission power of said transmitting means;

allowable transmission power holding means for holding a predetermined allowable transmission power value;

comparing means for comparing the average value with the allowable transmission power value; and

rate changing means for changing a transmission rate according to the comparison result in said comparing means, wherein said transmission power control means increases or decreases the transmission power for each slot and said rate changing means changes the transmission rate for each frame.

2. A radio communication apparatus having radio transmitting means and radio receiving means, said apparatus comprising:

first transmission power control means for increasing or decreasing transmission power of said transmitting means for each slot based on transmission power control information received in said receiving means;

rate changing means for changing a transmission rate of said transmitting means; and

second transmission power control means for increasing or decreasing the transmission power of said transmitting means for each frame based on an average value of the transmission power of said transmitting means.

3. The radio communication apparatus according to claim 2, wherein said rate changing means changes a spreading factor to change the transmission rate.

4. The radio communication apparatus according to claim 2, wherein said rate changing means decreases the transmission rate when the average value reaches an allowable transmission power value and increases the transmission rate when a difference between the average value and the allowable transmission power value is greater than a predetermined value.

5. The radio communication apparatus according to claim 2, wherein said rate changing means determines the transmission rate at a time that a communication is started by selecting one of a plurality of transmission rates set by negotiation with a control means operating according to a higher layer and determines the transmission rate during the communication based on the average value of the transmission power.

6. A transmission rate control method usable in a radio communication apparatus having radio transmitting means and radio receiving means, said method comprising the steps of:

receiving transmission power control information received in said receiving means;

increasing or decreasing transmission power of said transmitting means for each slot based on the received transmission power control information; and

increasing or decreasing the transmission power of said transmitting means for each frame by changing a transmission rate based on an average value of the transmission power of said transmitting means.

7. A radio communication system having a radio transmitter and a radio receiver, said apparatus comprising:

a first controller that is capable of increasing or decreasing transmission power of said transmitter for each slot based on transmission power control information received in said receiver;

a rate changer circuit that changes a transmission rate of said transmitter; and

a second controller that is capable of increasing or decreasing the transmission power of said transmitter for each frame based on an average value of the transmission power of said transmitter.

8. The radio communication system according to claim 7, wherein said rate changer circuit changes a spreading factor to change said transmission rate.

9. The radio communication system according to claim 7, wherein said rate changer circuit decreases the transmission rate when the average value reaches an allowable transmission power value and increases the transmission rate when a difference between the average value and the allowable transmission power value is greater than a predetermined value.

10. The radio communication system according to claim 7, wherein said rate changer circuit determines the transmission rate at a time that a communication is started by selecting one of a plurality of transmission rates set by negotiation with a controller operating according to a higher layer and determines the transmission rate during the communication based on the average value of the transmission power.

11. A radio communication system having a radio transmitter and a radio receiver, said apparatus comprising:

a transmission power controller that in capable of increasing or decreasing transmission power of said transmitter according to transmission power control information received by said receiver;

an average transmission power calculation circuit that calculates an average value of the transmission power of said transmitter;

an average transmission power calculation circuit that calculates an average value of the transmission power of said transmitter;

an allowable transmission power holding circuit that holds a predetermined allowable transmission power value;

a comparison circuit that compares the average value with the allowable transmission power value; and

a rate changer circuit that changes a transmission rate according to the comparison result in said comparison circuit, wherein said transmission power controller increases or decreases the transmission power for each slot and said rate changer circuit changes the transmission rate for each frame.