IP Library › Granted Patent US 7,953,013
Granted Patent B2
US 7,953,013 · App. 12/430,357 · Granted May 31, 2011

Transmission apparatus and method for transmitting data based on a communication mode determined employing information on an error rate

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Quick Facts
Patent No.
US 7,953,013
App. No.
12/430,357
Granted
May 31, 2011
Kind
B2
Abstract

A transmission apparatus and method updates 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 temporarily stores calibration data to be transmitted for updating a table. A scheduler 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 sends calibration data from the buffer. When calibration data is transmitted as a result of the scheduling, the scheduler notifies an address information generation section of the communication terminal apparatus to which the calibration data is transmitted. In one mode, first data is transmitted from a first communication apparatus to another communication apparatus, the first communication apparatus receives from the other communication apparatus, information on an error rate when the other communication apparatus receives the first data; and the first communication apparatus transmits second data to the other communication apparatus based on a communication mode determined using the information on the error rate.

Claims (29)

1. A communication apparatus comprising:

a transmission section that transmits first data and calibration data for updating a correspondence relationship between a communication mode and a carrier to interference ratio, to another communication apparatus;

a reception section that receives, from the other communication apparatus, information on a carrier to interference ratio and information on reception quality of the calibration data, when the other communication apparatus receives the transmitted calibration data;

an updating section that updates the correspondence relationship between the communication mode and the carrier to interference ratio, based on the received information on the carrier to interference ratio and the received information on the reception quality of the calibration data; and

a decision section that decides a communication mode for second data based on the updated correspondence relationship between the communication mode and the carrier to interference ratio, according to the received information on the carrier to interference ratio, wherein

the transmission section transmits the second data using the decided communication mode, to the other communication apparatus.

2. A transmission method performed by a communication apparatus, the method comprising:

transmitting first data and calibration data for updating a correspondence relationship between a communication mode and a carrier to interference ratio, from the communication apparatus to another communication apparatus;

receiving, from the other communication apparatus, information on a carrier to interference ratio and information on reception quality of the calibration data, when the other communication apparatus receives the transmitted calibration data;

updating the correspondence relationship between the communication mode and the carrier to interference ratio, based on the received information on the carrier to interference ratio and the received information on the reception quality of the calibration data;

deciding a communication mode for second data based on the updated correspondence relationship between the communication mode and the carrier to interference ratio, according to the received information on the carrier to interference ratio; and

transmitting the second data using the decided communication mode, to the other communication apparatus.

3. The communication apparatus according to claim 1 , wherein the information on the reception quality of the calibration data includes information on an error rate, throughput, or delay, when the other communication apparatus receives the transmitted calibration data.

4. The communication apparatus according to claim 1 , wherein:

the reception section receives information on communication mode candidates selected by the other communication apparatus, and

the updating section updates the correspondence relationship between the communication mode and the carrier to interference ratio based on the received information on the communication mode candidates, the received information on the carrier to interference ratio, and received information on an error rate.

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

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

7. The communication apparatus according to claim 1 , wherein the transmission section transmits the calibration data to all communication apparatuses which communicate with the communication apparatus.

8. The communication apparatus according to claim 1 , wherein the transmission section transmits the calibration data to another communication apparatus which requests transmission of calibration data.

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

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

11. The communication apparatus according to claim 1 , wherein the transmission section transmits the calibration data in a communication mode requested by the other communication apparatus.

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

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

14. The communication apparatus according to claim 1 , wherein the transmission section transmits data known to the other communication apparatus as the calibration data.

15. The communication apparatus according to claim 1 , wherein the transmission section transmits the calibration data including data unnecessary for the other communication apparatus.

16. A base station apparatus provided with the communication apparatus according to claim 1 .

17. A communication terminal station apparatus provided with the communication apparatus according to claim 1 .

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 2, 2021
From: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
To: APPLE INC.
Reel/Frame 055814/0967 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 27, 2014
From: PANASONIC CORPORATION
To: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Reel/Frame 033033/0163 →