Method and apparatus for providing fast detection of a high speed shared control channel

• US 7,639,644 B2
• Filed: 02/09/2006
• Issued: 12/29/2009
• Est. Priority Date: 02/13/2004
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Pietraski, Philip J., Tsai, Yingming, Sternberg, Gregory S.
• Primary Examiner(s): Rao; Seema S
• Assistant Examiner(s): HUYNH, KHOA B
• Application Number:
  US11/350,454
• Publication Number:
  US 20060126548A1
• Time in Patent Office: 1,419 Days
• Field of Search: 370/431, 370/438, 370/310, 370/328, 370/329, 370/342, 370/340, 370/341, 370/439, 370/441, 370/442, 714/699, 714/746, 714/752, 714/774, 714/758, 714/786, 714/795, 455/403, 455/422.1, 455/450, 455/39, 455/500, 455/507, 455/509
• US Class Current: 370/329
• CPC Class Codes: H03M 13/3738 with judging correct decoding
• CPC Class Codes: H03M 13/41 using the Viterbi algorithm or Viterbi processors
• CPC Class Codes: H03M 13/653 3GPP HSDPA, e.g. HS-SCCH or DS-DSCH related
• CPC Class Codes: H04L 1/0054 Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method and apparatus for providing fast detection of a high speed shared control channel (HS-SCCH). The HS-SCCH carries information necessary for receiving data via a high speed downlink shared channel (HS-DSCH). The apparatus receives messages transmitted via a plurality of HS-SCCHs. The apparatus measures a channel quality for the messages received via each HS-SCCH. The apparatus performs a threshold test by comparing the channel quality with a predetermined threshold. The apparatus then selects a HS-SCCH having the best channel quality among the HS-SCCHs.

Claims

1. A wireless transmit/receive unit (WTRU) for providing fast detection of a high speed shared control channel (HS-SCCH), the WTRU comprising:

a plurality of decoders for receiving downlink control messages including a last received downlink control message transmitted via a plurality of monitored HS-SCCHs and calculating an accumulated soft metric for each of the HS-SCCHs;

a threshold comparator which receives the calculated accumulated soft metrics from the decoders and determines that at least two of the accumulated soft metrics pass a threshold test and are close in value; and

a selector for selecting a high-speed downlink shared channel (HS-DSCH) indicated by the particular monitored HS-SCCH to receive downlink messages, on a condition that one of the at least two accumulated soft metrics is associated with a particular one of the monitored HS-SCCHs used to receive the last received downlink control message.

2. The WTRU of claim 1 wherein a downlink control message is received at a first time slot of a sub-frame of each HS-SCCH.

3. The WTRU of claim 2 wherein each of the plurality of decoders includes a bit error rate (BER) calculation unit for generating a BER of a respective one of the monitored HS-SCCHs, and the threshold comparator compares each BER to a predetermined threshold to determine which one of the monitored HS-SCCHs has the lowest BER.

4. In a wireless transmit/receive unit (WTRU) for providing fast detection of a high speed shared control channel (HS-SCCH), an integrated circuit (IC) comprising:

a plurality of decoders for receiving downlink control messages including a last received downlink control message transmitted via a plurality of monitored HS-SCCHs and calculating an accumulated soft metric for each of the HS-SCCHs;

a threshold comparator which receives the calculated accumulated soft metrics from the decoders and determines that at least two of the accumulated soft metrics pass a threshold test and are close in value; and

a selector for selecting a high-speed downlink shared channel (HS-DSCH) indicated by the particular monitored HS-SCCH to receive downlink messages, on a condition that one of the at least two accumulated soft metrics is associated with a particular one of the monitored HS-SCCHs used to receive the last received downlink control message.

5. The IC of claim 4 wherein a downlink control message is received at a first time slot of a sub-frame of each HS-SCCH.

6. The IC of claim 4 wherein each of the plurality of decoders includes a bit error rate (BER) calculation unit for generating a BER of a respective one of the monitored HS-SCCHs, and the threshold comparator compares each BER to a predetermined threshold to determine which one of the monitored HS-SCCHs has the lowest BER.

7. A wireless transmit/receive unit (WTRU) for providing fast detection of a high speed shared control channel (HS-SCCH), the WTRU comprising:

a plurality of decoders configured to receive messages transmitted via a plurality of HS-SCCHs, decode the messages, and generate an accumulated soft metric for each of the HS-SCCHs;

a threshold comparator configured to perform a threshold test by comparing each of the accumulated soft metrics with a soft metric threshold;

and a selector configured to select an HS-SCCH having the lowest accumulated soft metric among those HS-SCCHs having an accumulated soft metric lower than the soft metric threshold, wherein a plurality of the accumulated soft metrics pass the threshold test and are close in value, preference is given to the HS-SCCH that was previously used to transmit the last received message.

8. The WTRU of claim 7 wherein the HS-SCCH carries information necessary for receiving data via a high speed-downlink shared channel (HS-DSCH).

9. The WTRU of claim 7 wherein the messages are received at a first time slot of a sub-frame of each HS-SCCH.

10. The WTRU of claim 7 further comprising:

a bit error rate (BER) calculation unit configured to generate a bit error rate (BER) for each HS-SCCH;

and wherein the threshold comparator configured to compare each BER to a predetermined threshold to determine the HS-SCCH having the lowest BER.

11. An integrated circuit (IC) for providing fast detection of a high speed shared control channel (HS-SCCH), the IC comprising:

a plurality of decoders configured to receive messages transmitted via a plurality of HS-SCCHs, decode the messages, and generate an accumulated soft metric for each of the HS-SCCHs;

a threshold comparator configured to perform a threshold test by comparing each of the accumulated soft metrics with a soft metric threshold;

and a selector configured to select an HS-SCCH having the lowest accumulated soft metric among those HS-SCCHs having an accumulated soft metric lower than the soft metric threshold, wherein a plurality of the accumulated soft metrics pass the threshold test and are close in value, preference is given to the HS-SCCH that was previously used to transmit the last received message.

12. The IC of claim 11 wherein the HS-SCCH carries information necessary for receiving data via a high speed-downlink shared channel (HS-DSCH).

13. The IC of claim 11 wherein the messages are received at a first time slot of a sub-frame of each HS-SCCH.

14. The IC of claim 11 further comprising:

a bit error rate (BER) calculation unit configured to generate a bit error rate (BER) for each HS-SCCH;

and wherein the threshold comparator configured to compare each BER to a predetermined threshold to determine the HS-SCCH having the lowest BER.