Communication system, and method of transmitting data therein

• US 20010050900A1
• Filed: 05/30/2001
• Published: 12/13/2001
• Est. Priority Date: 06/02/2000
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Young Jo, Kim, Young Cho
• Granted Patent: US 6,820,231 B2
• Time in Patent Office: Days
• US Class Current: 370/232
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Disclosed is a method of transmitting data in a communication system. A receiving part determines an optimum data transmission rate in accordance with the change of the channel environment of the receiving part, and provides the determined data transmission rate to a transmitting part. The transmitting part processes the data to be transmitted according to the transmitted optimum data transmission rate, and transmits the processed data to the receiving part. The transmitting part applies a different data coding rate or modulation type to the data to be transmitted in accordance with the determined data transmission rate. Since the optimum data transmission rate is determined in accordance with the change of the channel environment of the receiving part, an improved data throughput and re-transmission probability can be obtained with a reduced delay. Also, the insufficiency of memory capacity in the receiving part can be solved.

Claims

1. A method of transmitting data in a communication system comprising the steps of:

a receiving part measuring a receiving quality of a received pilot signal, and determining the data transmission rate in accordance with the measured receiving quality;

the receiving part transmitting the determined data transmission rate to a transmitting part; and

the transmitting part encoding data to be transmitted in accordance with the determined data transmission rate, and transmitting the encoded data to the receiving part.

2. The method as claimed in

claim 1

, wherein the data to be transmitted from the transmitting part is processed by a coding rate and modulation type that correspond to the determined data transmission rate.

3. The method as claimed in

claim 1

, wherein the receiving quality is measured using one among a pilot signal power level included in the signal received in the receiving part, signal to interference ratio, bit error rate, and frame error rate.

4. The method as claimed in

claim 1

, further comprising the steps of:

the transmitting part compensating for the receiving quality in a manner that the transmitting part assigns more power to the signal if the data frame received in the receiving part is error; and

the transmitting part re-transmitting the data whose receiving quality is compensated for to the receiving part.

5. The method as claimed in

claim 1

, further comprising the steps of:

the transmitting part processing the signal in accordance with the determined data transmission rate if the data frame received in the receiving part is error; and

the transmitting part re-transmitting the processed signal to the receiving part.

6. The method as claimed in

claim 1

, wherein the determined data transmission rate is obtained by either one of a fixed type algorithm and a variable type algorithm with the measured receiving quality.

7. A method of transmitting data in a communication system comprising the steps of:

a fixed type algorithm preparing a mapping table having a fixed range of receiving quality with respect to a data transmission rate of a received signal;

a receiving part measuring the receiving quality of the received signal, and determining the data transmission rate in accordance with the measured receiving quality using the mapping table;

the receiving part transmitting the determined data transmission rate to a transmitting part; and

the transmitting part encoding data to be transmitted in accordance with the determined data transmission rate, and transmitting the encoded data to the receiving part.

8. The method as claimed in

claim 7

, wherein the step of determining the data transmission rate comprises the steps of:

lowering SIR step by one step on the mapping table if an error is occurred in the data received in the receiving part; and

determining the data transmission rate corresponding to the lowered receiving quality on the mapping table as the data transmission rate corresponding to the received signal.

9. The method as claimed in

claim 8

, wherein the error is checked by a cyclic redundancy check code.

10. The method as claimed in

claim 7

, wherein the step of determining the data transmission rate comprises the steps of:

heightening SIR step by one step on the mapping table if an error is not occurred in the data received in the receiving part; and

determining the data transmission rate corresponding to the heightened receiving quality on the mapping table as the data transmission rate corresponding to the received signal.

11. The method as claimed in

claim 10

, wherein the error is checked by a cyclic redundancy check code in the received signal.

12. The method as claimed in

claim 7

, wherein the receiving quality is measured using one among a pilot signal power level included in the signal received in the receiving part, signal to interference rate, bit error rate, and frame error rate.

13. The method as claimed in

claim 7

, wherein the data to be transmitted from the transmitting part is processed by a coding rate and modulation type that correspond to the determined data transmission rate.

14. A method of transmitting data in a communication system comprising the steps of:

a fixed type algorithm preparing a mapping table having a fixed range of receiving quality with respect to a data transmission rate of a received signal;

a receiving part checking whether an error exists in the received signal, and changing the mapping table using a variable type algorithm depending on a result of checking;

the receiving part determining the data transmission rate corresponding to a newly measured receiving quality using the changed mapping table;

the receiving part transmitting the determined data transmission rate to a transmitting part; and

the transmitting part encoding data to be transmitted in accordance with the determined data transmission rate, and transmitting the encoded data to the receiving part.

15. The method as claimed in

claim 14

, wherein the step of changing the mapping table includes the step of heightening the receiving quality range mapped on the data transmission rate on the mapping table by “

Γ

”

(heightened value of the receiving quality range)”

if an error is occurred in the received signal.

16. The method as claimed in

claim 14

, wherein the step of changing the mapping table includes the step of lowering the receiving quality range mapped on the data transmission rate on the mapping table by “

Δ

”

(lowered value of the receiving quality range)”

if an error is not occurred in the received signal.

17. The method as claimed in

claim 14

, wherein the receiving quality is measured using one among a pilot signal power level included in the signal received in the receiving part, signal to interference ratio, bit error rate, and frame error rate.

18. The method as claimed in

claim 14

, wherein the error is checked by a cyclic redundancy check code in the received signal.

19. The method as claimed in

claim 14

, wherein the data to be transmitted from the transmitting part is processed by a coding rate and modulation type that correspond to the determined data transmission rate.

20. A method of transmitting data in a communication system comprising the steps of:

a fixed type algorithm preparing in a transmitting part a mapping table having a fixed range of receiving quality according to a data transmission rate;

a receiving part measuring the receiving quality of a received pilot signal, and transmitting information corresponding to the measured receiving quality to the transmitting part;

the transmitting part determining the data transmission rate using the information corresponding to the measured receiving quality and the mapping table; and

the transmitting part encoding data to be transmitted in accordance with the determined data transmission rate, and transmitting the encoded data to the receiving part.

21. A method of transmitting data in a communication system comprising the steps of:

preparing a mapping table having a range of receiving quality with respect to a data transmission rate;

receiving data and checking whether an error exists in the received data using a cyclic redundancy check code;

adjusting the range of the receiving quality on the mapping table according to existence/nonexistence of the error; and

determining the data transmission rate using the mapping table where the range of the receiving quality is adjusted.

22. The method as claimed in

claim 21

, further comprising the steps of:

measuring a new receiving quality after the mapping table where the range of the receiving quality is adjusted is made;

comparing the mapping table where the range of the receiving quality is adjusted with the new receiving quality; and

selecting a new data transmission rate that corresponds to the new receiving quality as a result of comparison.

23. The method as claimed in

claim 21

, wherein the receiving quality is a signal to interference rate (SIR).

24. A communication system comprising:

means for preparing a mapping table having a fixed range of receiving quality with respect to a data transmission rate of a received signal by a fixed algorithm;

means for measuring the receiving quality of the received signal, and determining the data transmission rate in accordance with the measured receiving quality using the mapping table; and

means for transmitting the determined data transmission rate to a transmitting part.

25. A communication system comprising:

means for preparing a mapping table having a fixed range of receiving quality with respect to a data transmission rate of a received signal by a fixed type algorithm;

means for checking whether an error exists in the received signal, and changing the mapping table using a variable type algorithm depending on a result of checking;

means for measuring receiving quality of a newly received signal having a certain data transmission rate

means for determining the data transmission rate corresponding to a newly measured receiving quality using the changed mapping table; and

means for transmitting the determined data transmission rate to a transmitting part.