Radio communication apparatus and transmission rate control method

US 20020082039A1
Filed: 02/27/2002
Published: 06/27/2002
Est. Priority Date: 04/17/1998
Status: Active Grant

First Claim

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1. A radio communication apparatus comprising:

transmission rate switching means for switching a transmission rate of a transmission signal based on reception quality information from the other end of communication; and

transmission means for transmitting a transmission signal at the switched transmission rate.

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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.

22 Citations

30 Claims

1. A radio communication apparatus comprising:
- transmission rate switching means for switching a transmission rate of a transmission signal based on reception quality information from the other end of communication; and
  
  transmission means for transmitting a transmission signal at the switched transmission rate.
- View Dependent Claims (2, 3, 4, 5, 16, 17, 18)
- - 2. The radio communication apparatus according to claim 1, wherein the transmission rate switching means selects a ½
    - transmission rate when the reception quality measurement result of the reception quality information is smaller than a first threshold.
  - 3. The radio communication apparatus according to claim 1, wherein the transmission rate switching means selects a transmission rate at which the reception quality measurement result becomes greater than the first threshold when the reception quality measurement result of the reception quality information is smaller than the first threshold.
  - 4. The radio communication apparatus according to claim 3, wherein the transmission rate switching means selects a double transmission rate when the reception quality measurement result is greater than a second threshold which is greater than said first threshold.
  - 5. The radio communication apparatus according to claim 1, wherein the transmission rate switching means selects a transmission rate that meets the reception quality of the reception quality measurement result in the reception quality information and at the same time allows the fastest transmission.
  - 16. The radio communication apparatus according to claim 2, wherein the threshold is set according to the transmission rate in communication.
  - 17. The radio communication apparatus according to claim 2, using a CDMA communication system and setting a threshold according to the spreading factor.
  - 18. The radio communication apparatus according to claim 2, using a CDMA communication system and setting a threshold according to the number of multiplexing codes.

6. A radio communication apparatus comprising:
- reception quality estimation means for estimating the reception quality of the other end of communication based on transmission power control information of said other end of communication;
  
  transmission rate switching means for switching the transmission rate of a transmission signal based on this reception quality estimation result; and
  
  transmission means for transmitting the transmission signal at the switched transmission rate.
- View Dependent Claims (7, 8, 9, 10)
- - 7. The radio communication apparatus according to claim 6, wherein the reception quality estimation deans estimates the reception quality by accumulating the transmission power control information and the transmission rate switching means selects a ½
    - transmission rate when the reception quality estimation result is smaller than a threshold.
  - 8. The radio communication apparatus according to claim 6, wherein the reception quality estimation means estimates the reception quality by accumulating the transmission power control information and the transmission rate switching means selects a transmission rate at which the reception quality becomes greater than the first threshold when the reception quality estimation result is smaller than the first threshold.
  - 9. The radio communication apparatus according to claim 8, wherein the reception quality estimation means estimates the reception quality by accumulating the transmission power control signal and the transmission rate switching means selects a double transmission rate when the reception quality estimation result is greater than a second threshold which is greater than the first threshold.
  - 10. The radio communication apparatus according to claim 6, wherein the reception quality estimation means estimates the reception quality by accumulating the transmission power control signal and the transmission rate switching means selects a transmission rate that meets the reception quality of the reception quality estimation result and at the same time allows the fastest transmission.

11. A radio communication apparatus comprising:
- transmission rate switching means for switching a transmission rate of a transmission signal based on transmission power control information from the other end of communication; and
  
  transmission means for transmitting the transmission signal at the switched transmission rate.
- View Dependent Claims (12, 13, 14, 15, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30)
- - 12. The radio communication apparatus according to claim 11, wherein the transmission rate switching means selects a ½
    - transmission rate when the transmission power in the transmission power control information is greater than a threshold.
  - 13. The radio communication apparatus according to claim 11, wherein the transmission rate switching means selects a transmission rate at which the transmission power becomes smaller than a first threshold when the transmission power in the transmission power control information is greater than the first threshold.
  - 14. The radio communication apparatus according to claim 13, wherein the transmission rate switching means selects a double transmission rate when the transmission power is smaller than a second threshold which is smaller than said first threshold.
  - 15. The radio communication apparatus according to claim 11, wherein the transmission rate switching means switches the transmission rate so that the transmission power in the transmission power control information is within a predetermined range.
  - 20. The radio communication system according to claim 19, wherein the second radio communication apparatus comprises transmission power control means for controlling the transmission power of the first radio communication apparatus based on the reception quality measurement result.
  - 21. The radio communication system according to claim 20, wherein the first radio communication apparatus comprises reception quality estimation means for estimating the reception quality of said other end of communication based on the transmission power control information from the second radio communication apparatus.
  - 22. The radio communication system according to claim 19, wherein the first radio communication apparatus transmits information to the second radio communication apparatus all the time.
  - 23. The radio communication system according to claim 19, wherein the first radio communication apparatus transmits information to the second radio communication apparatus only when required.
  - 24. The radio communication system according to claim 23, wherein the second radio communication apparatus switches the transmission rate when the reception quality measured by the first radio communication apparatus deteriorates.
  - 25. The radio communication system according to claim 23, wherein, when the reception quality of the second radio communication apparatus deteriorates, the second radio communication apparatus requests the first radio communication apparatus to send information including the reception quality.
  - 26. The radio communication system according to claim 23, wherein the first radio communication apparatus requests the second radio communication apparatus to resend the information including the reception quality when the reception signal contains an error and the second radio communication apparatus, upon reception of the resend request, requests the first radio communication apparatus to send the information including the reception quality.
  - 27. The radio communication system according to claim 19, wherein the transmission rate switching means switches the transmission rate when the transmission rate switching means receives a report that the transmission power is excessive from the second radio communication apparatus.
  - 29. The transmission rate control method according to claim 28, wherein said first layer is instructed to lower the transmission rate when said average transmission power is greater than said allowable transmission power.
  - 30. The transmission rate control method according to claim 28, wherein said first layer is instructed to increase the transmission rate when said average transmission power is smaller than said allowable transmission power by a predetermined amount or more.

19. A radio communication system comprising:
- a first radio communication apparatus comprising reception quality measuring means for measuring reception quality and transmission means for transmitting information including this reception quality; and
  
  a second radio communication apparatus comprising transmission rate switching means for switching a transmission rate based on said reception quality.

28. A transmission rate control method comprising the steps of:
- comparing allowable transmission power set in a first layer with average transmission power obtained in a second layer, which is lower than said first layer;
  
  indicating a change or no change in a transmission rate in said second layer according to said comparison result; and
  
  changing the transmission rate in a third layer which is higher than said second layer and lower than said first layer according to a change or no change in said transmission rate.

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Current Assignee
INVT SPE LLC (SoftBank Group Corp.)
Original Assignee
Katsuhiko Hiramatsu, Osamu Kato, Toyoki Ue
Inventors
Hiramatsu, Katsuhiko, Kato, Osamu, Ue, Toyoki

Granted Patent

US 6,611,676 B2
Time in Patent Office

Days
Field of Search
US Class Current

455/522
CPC Class Codes

H04L 1/0002   by adapting the transmissio...

H04L 1/0003   by switching between differ...

H04L 1/0025   Transmission of mode-switch...

H04L 1/0026   Transmission of channel qua...

H04W 16/14   Spectrum sharing arrangemen...

H04W 24/00   Supervisory, monitoring or ...

H04W 28/22   Negotiating communication rate

H04W 52/24   using SIR [Signal to Interf...

H04W 52/265   taking into account the qua...

H04W 52/267   taking into account the inf...

H04W 72/20   Control channels or signall...

H04W 72/21   in the uplink direction of ...

H04W 72/542   using measured or perceived...

Radio communication apparatus and transmission rate control method

First Claim

10 Assignments

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Abstract

22 Citations

30 Claims

Specification

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Radio communication apparatus and transmission rate control method

First Claim

10 Assignments

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0 Petitions

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Accused Products

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Abstract

22 Citations

30 Claims

Specification

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Solutions

Use Cases

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