Transmission apparatus and communication mode selection table updating method

• US 20040248520A1
• Filed: 03/09/2004
• Published: 12/09/2004
• Est. Priority Date: 06/28/2002
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Miyoshi, Kenichi
• Granted Patent: US 7,542,433 B2
• Time in Patent Office: Days
• US Class Current: 455/67.13
• CPC Class Codes: H04B 7/2659 for data rate control
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication

Abstract

A transmission apparatus and method for updating a communication mode selection table that updates a communication mode selection table correctly and selects an optimal MCS according to an actual channel condition. A buffer (104) temporarily stores calibration data to be transmitted for updating a table (148). A scheduler (106) performs scheduling of data to be transmitted based on a CIR on a downlink reported from a plurality of communication terminal apparatuses. When there is no data to be transmitted, the scheduler (106) sends calibration data from the buffer (104). When calibration data is transmitted as a result of the scheduling, the scheduler (106) notifies an address information generation section (112) of the communication terminal apparatus to which the calibration data is transmitted.

Claims

1. A transmission apparatus in a radio communication system using a communication mode selection table for selecting a communication mode according to a channel condition, comprising:

a transmission section that transmits calibration data for updating the communication mode selection table; and

a decision section that decides a communication mode for transmitting data based on said communication mode selection table updated according to the transmission quality when the transmitted calibration data is transmitted through a communication channel.

2. The transmission apparatus according to claim 1, wherein said decision section comprises:

a reception section that receives information including transmission quality when the calibration data is transmitted through a communication channel; and

an updating section that updates the communication mode selection table based on received information including the transmission quality, and

decides a communication mode for actually transmitting data from the updated communication mode selection table.

3. The transmission apparatus according to claim 1, wherein said decision section comprises a reception section that receives information including communication mode candidates selected from the communication mode selection table which is owned by the station on the other end and updated based on the transmission quality of calibration data, and

decides a communication mode for actually transmitting data from the received communication mode candidates.

4. The transmission apparatus according to claim 1, wherein said transmission section inserts calibration data in an empty slot and transmits the calibration data.

5. The transmission apparatus according to claim 1, wherein said transmission section inserts calibration data in every predetermined number of slots and transmits the calibration data.

6. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data to all stations on the other end which communicate with said transmission apparatus.

7. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data to a station on the other end which requests transmission of calibration data.

8. The transmission apparatus according to claim 1, wherein said transmission section transmits address information indicating the transmission destination of calibration data.

9. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data by changing a communication mode periodically.

10. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data in a communication mode requested by the station on the other end.

11. The transmission apparatus according to claim 10, wherein when said calibration data is transmitted, said transmission section transmits information indicating that calibration data is transmitted as communication mode information for notifying a communication mode of said calibration data.

12. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data including data of a random string and error detection code.

13. The transmission apparatus according to claim 1, wherein said transmission section transmits data known to the station on the other end as calibration data.

14. The transmission apparatus according to claim 1, wherein said transmission section transmits calibration data including data unnecessary for the station on the other end.

15. A base station apparatus provided with the transmission apparatus according to claim 1.

16. A communication terminal apparatus provided with the transmission apparatus according to claim 1.

17. A method for updating a communication mode selection table in a radio communication system using a communication mode selection table for selecting a communication mode according to a channel condition, comprising:

a step of transmitting calibration data for updating the communication mode selection table; and

a step of updating the communication mode selection table based on the transmission quality when the transmitted calibration data is transmitted through a communication channel.