Method for controlling data transmission in a radio communications system

• US 20020168945A1
• Filed: 05/13/2002
• Published: 11/14/2002
• Est. Priority Date: 05/14/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kwon, Hyuck Chan, Hwang, Seung Hoon
• Granted Patent: US 7,047,473 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• 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 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]

Abstract

A method for controlling the transmission of data in a radio communications system transmits response signals from a receiver which includes information that reflects received signal quality, as well as information indicating whether an error has occurred in the data transmission. In one case, acknowledgment signals or negative acknowledgment signals may be regarded as no reply and not forwarded to a transmitter. In another case, the signals could be recognized as an acknowledgment or retransmission request by a receiver. Preferably, the signals transmitted from the receiver to the transmitter are composed of more than 2-bit multiplexed information. By transmitting response signals of this type, the transmission efficiency of packet data may be increased, and the automatic repeat request (ARQ) performance by the system may be greatly improved.

Claims

1. A method for controlling transmission of data in a radio communication system comprising:

generating a response signal which includes first information indicating whether an error is present in the data of a radio frame as received by a receiver and a second information indication of reception quality of the data of a radio frame, and transmitting the response signal from the receiver to a transmitter which transmitted the data.

2. The method of claim 1, wherein the second information is multiplexed information which is at least 2 bits in length.

3. The method of claim 1, wherein, if the receiver determining the data does not have an error, the response signal is transmitted as an acknowledgment (ACK) signal.

4. The method of claim 3, wherein the acknowledgment (ACK) signal is multiplexed information which includes continuous equivalent bit values.

5. The method of claim 1, wherein, if the receiver determining the data does not have an error, the response signal is not transmitted and is recognized as an acknowledgment signal by the transmitter.

6. The method of claim 1, wherein, if the receiver determining the data has an error but the reception quality is in a good condition, the response signal is transmitted as a negative acknowledgment (NAK) signal.

7. The method of claim 1, wherein, if the receiver determining the data has an error but the reception quality is in a good condition, the response signal is transmitted as a negative acknowledgment with additional control information signal.

8. The method of claim 1, wherein the radio frame is composed of three time slots.

9. The method of claim 1, wherein, if the receiver determining the data has an error, and the reception quality is in a poor condition, the response signal is transmitted as a negative acknowledgment signal with additional control information signal.

10. The method of claim 1, wherein, if the receiver determining the data has an error, and the reception quality is in a poor condition, the response signal is transmitted as a negative acknowledgment (NAK) signal.

11. The method of claim 9, wherein the NAK with control signal is multiplexed information which includes non-continuous bit values.

12. The method of claim 9, wherein the additional control information includes one of time delay, sending power, and a multicode number.

14. The method of claim 13, wherein the NAK signal includes multiplexed information at least 2 bits in length.

15. The method of claim 13, wherein, if the reception quality is determined to be greater than said predetermined quality, the NAK signal includes information associated with a request for retransmission of the packet data.

16. The method of claim 13, wherein, if the reception quality is determined to be greater than said predetermined quality, the NAK signal includes information associated with a request for retransmission of the packet data in accordance with the reception quality.

17. The method of claim 15, wherein the information associated with a request for retransmission of the packet data is multiplexed information which includes continuous equivalent bit values.

18. The method of claim 13, wherein, if the reception quality is less than said predetermined quality, the NAK signal includes information associated with a request for retransmission of a packet data in accordance with the reception quality.

19. The method of claim 13, wherein, if the reception quality is less than said predetermined quality, the NAK signal includes information associated with a request for retransmission of a packet data.

20. The method of claim 18, wherein the information about a request for retransmission of a packet data in accordance with the reception quality is multiplexed information which includes non-continuous bit values.

13. A method for controlling data transmission in a radio communication system comprising:

receiving packet data;

if an error is determined to exist in the packet data, then determining reception quality of the packet data;

comparing the reception quality with a predetermined reception quality; and

transmitting a negative acknowledgment (NAK) signal in accordance with a result of the comparing step.

21. A method for controlling data transmission in a radio communication system comprising:

determining whether received packet data has an error;

processing an acknowledgment signal as no reply if the packet data does not have an error;

comparing a reception quality of the packet data with a predetermined reception quality if the packet data has an error; and

transmitting an negative acknowledgment (NAK) signal with information indicating the reception quality.

22. The method of claim 21, wherein the information indicating the reception quality indicates one of time delay, transmission power, and a multicode number.

23. The method of claim 21, wherein the NAK signal transmitted with the information indicating the reception quality is multiplexed information which is at least 2 bits in length.

24. The method of claim 23, wherein one bit of the multiplexed information is used for displaying the retransmission request signal, and at least one remaining bit is used for displaying information indicating the reception quality in accordance with the combination.

25. The method of claim 21, further comprising:

transmitting a negative acknowledgment (NAK) signal of the packet data if the reception quality is greater than said predetermined quality.

26. The method of claim 21, wherein the information indicating reception quality includes information indicative of a signal-to-interference ratio.

28. The method of claim 27, wherein another response signal received is recognized as an acknowledgment (ACK) signal or a negative acknowledgment (NAK) signal.

29. The method of claim 27, wherein the information indicating a reception quality is generated in case the reception quality at the receiver is in a poor condition.

30. The method of claim 27, wherein the information indicating reception quality contains one of time delay, transmission power, and a multicode number.

27. A method for controlling data transmission in a radio communication system determining, in a transmitter, whether a receiver of packet data has transmitted a response signal;

if no response signal is received from the receiver for a certain amount of time, recognizing the failure to receive the response signal in the transmitter as one of an acknowledgment (ACK) and a negative acknowledgment (NAK) signal, but if the response signal is received, the transmitter recognizes the response signal as a NAK signal including information indicating a reception quality situation.

31. A method for controlling data transmission in a radio communication system, comprising:

processing an acknowledgment signal (ACK) as no reply if no error is found in transmitted packet data received by a receiver;

determining a degree of a reception quality if the packet data is determined to have an error;

transmitting a negative acknowledgment (NAK) signal if the reception quality is in a good condition;

transmitting a NAK signal including information indicative of the reception quality if the reception quality is determined to be in a poor condition; and

transmitting packet data reflecting each signal from the transmitter.

33. The method of claim 31, wherein the degree of the reception quality is determined by comparing the reception quality to a predetermined quality.

34. The method of claim 31, wherein, if the reception quality is in a poor condition, the degree of the reception quality is fragmentized, and information indicative of the reception quality corresponding to each degree is added to the NAK signal before the signal is transmitted.

35. The method of claim 31, wherein, if each signal includes plural bits, the signals are as many as two to the plural bit power.

36. The method of claim 35, wherein the plural bits are assigned such that some bits include information indicative of the reception quality and other bits include information about acknowledgment (ACK) or negative acknowledgment (NAK).

37. The method of claim 31, wherein, if the transmitter does not receive any signal indicating the acknowledgment (ACK) is not received for a certain amount of time, the transmitter recognizes such as the ACK signal.

38. The method of claim 31, wherein, if the transmitter receives a signal indicating the negative acknowledgment (NAK), the packet data is retransmitted at the request for retransmission.

39. The method of claim 31, wherein, if the transmitter receives a negative acknowledgment signal including the information indicative of the reception quality, the packet data is retransmitted based on the reception quality.

32. A method for controlling data transmission in a radio communication system, comprising:

processing an acknowledgment signal (ACK) as no reply if no error is found in transmitted packet data received by a receiver;

determining a degree of a reception quality if the packet data is determined to have error;

transmitting a negative acknowledgment (NAK) signal if the reception quality is determined to be in a poor condition;

transmitting a NAK signal including information indicative of the reception quality if the reception quality is in a good condition; and

transmitting packet data reflecting each signal at the transmitter.

40. A method for controlling data transmission in a radio communication system, comprising:

transmitting an acknowledgment (ACK) signal if no error is found in transmitted packet data received by a receiver;

determining a degree of a reception quality if the packet data is determined to have an error;

processing a negative acknowledgment (NAK) signal as no reply if the reception quality is in a good condition;

transmitting, at the receiver, a negative acknowledgment (NAK) signal including information indicative of the reception quality if the reception quality is in a poor condition; and

transmitting the packet data reflecting each signal at the transmitter.

41. A data retransmission feedback method in a retransmission feedback system comprising:

determining whether packet data received by a receiver has an error;

if the packet data has an error, and sending a negative acknowledgment (NAK) signal from the receiver to the transmitter which transmitted the packet data to request retransmission of the packet data, wherein the negative acknowledgment signal includes multiplexed information based on degree of a reception quality.

42. The method of claim 41, wherein, if the reception quality is in a good condition, the NAK signal includes information associated with a request for retransmission of the packet data.

43. The method of claim 41, wherein, if the reception quality is in a poor condition, the NAK signal includes information associated with a request for retransmission of the packet data in accordance with the reception quality.

44. The method of claim 43, wherein the information associated with a request for retransmission of the packet data based on reception quality includes different additional control information depending on the reception quality.

45. The method of claim 44, wherein the information indicative of the reception quality includes time delay, transmission power and a multicode number.

46. The method of claim 41, wherein, the NAK signal is assigned as plural bits.

47. A terminal, comprising:

means for sending or receiving information through a physical layer; and

means for sending or receiving information though a protocol layer;

wherein said means for sending or receiving information through the protocol layer carries information indicative of a reception quality of a transmitted signal.