Outer-loop power control for wireless communication systems

• US 8,081,598 B2
• Filed: 01/13/2004
• Issued: 12/20/2011
• Est. Priority Date: 02/18/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Malladi, Durga P., Chen, Tao, Wei, Yongbin
• Primary Examiner(s): Eng, George
• Assistant Examiner(s): HUYNH, NAM TRUNG
• Application Number:
  US10/756,957
• Publication Number:
  US 20050007986A1
• Time in Patent Office: 2,898 Days
• Field of Search: 370/253, 370/318, 370/345, 370/252, 370/230, 370232-234, 455/515, 455/561, 455/522, 455/67.11, 379/1.03, 375/316, 375340-341, 375/225, 375/227, 375/262, 375/265, 714794-795
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0039 other detection of signalling, e.g. detection of TFCI explicit signalling H04L1/0046, H04L27/0012 and H04L25/0262 take precedence
• CPC Class Codes: H04L 1/201 Frame classification, e.g. bad, good or erased frame indication per se H04L1/0082

Abstract

Systems and methods for evaluating packets and frames in a wireless communication system having multiple reverse-link channels including a spontaneous, burst oriented transmission channel and its corresponding rate indicator channel. One embodiment comprises a base station monitoring the rate indicator channel, decoding the rate indicator channel using a maximum likelihood decoder and detecting the presence of a packet on the rate indicator channel by comparing a likelihood with a threshold, and analyzing the validity of a frame on the burst oriented channel based on the presence and content of packets received on the rate indicator channel.

Claims

1. A method for evaluating packets and frames in a wireless communication system having a burst oriented channel, and a corresponding rate indicator channel, the method comprising:

monitoring the rate indicator channel;

determining the presence of a packet on the rate indicator channel based on a likelihood generated by a maximum likelihood decoder that decodes the rate indicator channel; and

analyzing the packet, if detected, to determine whether a frame is valid based on a comparison between a sub-packet identifier (ID) and payload size of the packet with a sub-packet ID and payload size of one or more previous packets.

2. The method of claim 1 wherein analyzing the packet further comprises comparing the packet with an expected packet type if the packet is a zero-rate packet.

3. The method of claim 2 wherein analyzing the packet further comprises detecting energy on the burst oriented data channel if the packet matches the expected packet type.

4. The method of claim 1 wherein further comprising:

determining the validity of the frame based upon a detection of energy on the burst oriented channel if there is no packet on the corresponding rate indicator channel and no packet was expected.

5. The method of claim 1, wherein determining the presence of a packet is performed at predetermined intervals.

6. The method of claim 5, wherein the interval is a subframe interval.

7. The method of claim 1, wherein analyzing the packet further comprises

determining if the packet is a zero-rate packet, and analyzing the sub-packet ID and the payload of the packet if the packet is not a zero-rate packet.

8. The method of claim 7 wherein analyzing the packet further comprises

decoding information on the burst oriented data transmission channel using the packet if the sub-packet ID and payload are not expected.

9. The method of claim 1, wherein the packet does not include cyclical redundancy check (CRC) bits.

10. The method of claim 1, wherein the determining the presence of the packet includes:

comparing the likelihood with a threshold,

wherein the determination as to whether the packet is present is based on the comparison.

11. The method of claim 1, wherein the determining the presence of the packet includes:

identifying a codeword that is most likely to be present on the rate indicator channel,

wherein the likelihood corresponds to the likelihood that the most likely codeword is present on the rate indicator channel.

12. The method of claim 1, wherein the rate indicator channel is a discontinuous transmission channel.

13. A system for evaluating packets and frames in a wireless communication system, comprising:

a base station; and

a mobile station coupled to the base station via a wireless communication link;

wherein the base station is configured to receive data from the mobile station on a plurality of reverse-link channels on the wireless communication link including a burst oriented channel, and a corresponding rate indicator channel; and

wherein the base station is configured to monitor the rate indicator channel, determine the presence of a packet on the rate indicator channel based on a likelihood generated by a maximum likelihood decoder that decodes the rate indicator channel and analyze the packet, if detected, to determine whether a frame is valid based on a comparison between a sub-packet identifier (ID) and payload size of the packet with a sub-packet ID and payload size of one or more previous packets.

14. The system of claim 13 wherein the base station is configured to analyze the packet by comparing the packet with an expected packet type if the packet is a zero-rate packet.

15. The system of claim 14 wherein the base station is configured to analyze the packet by detecting energy on the burst oriented channel if the packet matches the expected packet type.

16. The system of claim 13 wherein the base station is further configured to determine the validity of the frame by detecting energy on the burst oriented channel if there is no packet on the corresponding rate indicator channel and no packet was expected.

17. The system of claim 13, wherein the presence of a packet is determined at predetermined intervals.

18. The system of claim 17, wherein the interval is a subframe interval.

19. The system of claim 13, wherein the base station is configured to analyze the packet by determining if the packet is a zero-rate packet, and analyzing the sub-packet ID and the payload of the packet if the packet is not a zero-rate packet.

20. The system of claim 19 wherein the base station is further configured to analyze the packet by decoding information on the burst oriented data transmission channel using the packet if the sub-packet ID and payload are expected.

21. A base station operable to communicate with a mobile station via a wireless communication channel, wherein the base station comprises:

a processing subsystem; and

a transceiver subsystem coupled to the processing subsystem;

wherein the transceiver subsystem is configured to receive signals on a plurality of reverse-link channels on the wireless communication link including a burst oriented channel, and a corresponding rate indicator channel; and

wherein the base station is configured to monitor the rate indicator channel, determine the presence of a packet on the rate indicator channel based on a likelihood generated by a maximum likelihood decoder that decodes the rate indicator channel and analyze the packet, if detected, to determine whether a frame is valid based on a comparison between a sub-packet identifier (ID) and payload size of the packet with a sub-packet ID and payload size of one or more previous packets.

22. The base station of claim 21 wherein the base station is configured to analyze the packet by comparing the packet with an expected packet type if the packet is a zero-rate packet.

23. The base station of claim 22 wherein the base station is configured to analyze the packet by detecting energy on the burst oriented channel if the packet matches the expected packet type.

24. The base station of claim 21 wherein the base station is further configured to determine the validity of the frame by detecting energy on the burst oriented channel if there is no packet on the corresponding rate indicator channel and no packet was expected.

25. The base station of claim 21, wherein the presence of a packet is determined at predetermined intervals.

26. The base station of claim 25, wherein the interval is a subframe interval.

27. The base station of claim 21, wherein the base station is configured to analyze the packet by determining if the packet is a zero-rate packet, and analyzing the sub-packet ID and the payload of the packet if the packet is not a zero-rate packet.

28. The base station of claim 27 wherein the base station is further configured to analyze the packet by decoding information on the burst oriented data transmission channel using the packet if the sub-packet ID and payload are expected.

29. An apparatus operable to communicate with a mobile station via a wireless communication channel, wherein the base station comprises:

means for monitoring the rate indicator channel;

means for determining the presence of a packet on the rate indicator channel based on a likelihood generated by a maximum likelihood decoder that decodes the rate indicator channel; and

means for analyzing the packet, if detected, to determine whether a frame is valid based on a comparison between a sub-packet identifier (ID) and payload size of the packet with a sub-packet ID and payload size of one or more previous packets.

30. The apparatus of claim 29, wherein the means for determining determines the presence of a packet at predetermined intervals.

31. The apparatus of claim 30, wherein the interval is a subframe interval.

32. A non-transitory computer-readable storage medium including program code stored thereon, which when executed by a processor is for evaluating packets and frames in a wireless communication system having a burst oriented channel, and a corresponding rate indicator channel, comprising:

logic configured to monitor the rate indicator channel;

logic configured to determine the presence of a packet on the rate indicator channel based on a likelihood generated by a maximum likelihood decoder that decodes the rate indicator channel; and

logic configured to analyze the packet, if detected, to determine whether a frame is valid based on a comparison between a sub-packet identifier (ID) and payload size of the packet with a sub-packet ID and payload size of one or more previous packets.

33. The apparatus of claim 32, wherein the logic configured to determine determines the presence of a packet at predetermined intervals.

34. The apparatus of claim 33, wherein the interval is a subframe interval.