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

• US 7,054,288 B2
• Filed: 07/30/2004
• Issued: 05/30/2006
• 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): Patel, Ajit
• Assistant Examiner(s): BLOUNT, STEVEN
• Application Number:
  US10/903,389
• Publication Number:
  US 20050180344A1
• Time in Patent Office: 669 Days
• Field of Search: 370/522, 370/345, 370/341, 370/532, 370/329, 375/262, 714/746
• 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 method for providing fast detection of a high speed shared control channel (HS-SCCH), the method comprising:

(a) receiving messages transmitted via a plurality of HS-SCCHs;

(b) decoding the messages;

(c) generating an accumulated soft metric for each of the HS-SCCHs;

(d) comparing each of the accumulated soft metrics with a soft metric threshold; and

(e) selecting 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 when a plurality of soft metrics exceed the soft metric threshold and are close in value, preference is given to one of the soft metrics that was previously used on the last received message.

2. The method of claim 1 wherein the HS-SCCH carries information necessary for receiving data via a high speed-downlink shared channel (HS-DSCH).

3. The method of claim 1 wherein the messages are received at a first time slot of a sub-frame of each HS-SCCH.

4. The method of claim 1 further comprising:

(f) generating a bit error rate (BER) for each HS-SCCH;

(g) comparing each BER to a predetermined threshold; and

(h) determining the HS-SCCH having the lowest BER.

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

(a) means for receiving messages transmitted via a plurality of HS-SCCHs;

(b) means for decoding the messages;

(c) means for generating an accumulated soft metric for each of the HS-SCCHs;

(d) means for comparing each of the accumulated soft metrics with a soft metric threshold; and

(e) means for selecting 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 when a plurality of soft metrics exceed the soft metric threshold and are close in value, preference is given to one of the soft metrics that was previously used on the last received message.

6. The WTRU of claim 5 wherein the HS-SCCH carries information necessary for receiving data via a high speed-downlink shared channel (HS-DSCH).

7. The WTRU of claim 5 wherein the messages are received at a first time slot of a sub-frame of each HS-SCCH.

8. The WTRU of claim 5 further comprising:

(f) means for generating a bit error rate (BER) for each HS-SCCH;

(g) means for comparing each BER to a predetermined threshold; and

(h) means for determining the HS-SCCH having the lowest BER.

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

(a) means for receiving messages transmitted via a plurality of HS-SCCHs;

(b) means for decoding the messages;

(c) means for generating an accumulated soft metric for each of the HS-SCCHs;

(d) means for comparing each of the accumulated soft metrics with a soft metric threshold; and

(e) means for selecting 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 when a plurality of soft metrics exceed the soft metric threshold and are close in value, preference is given to one of the soft metrics that was previously used on the last received message.

10. The IC of claim 9 wherein the HS-SCCH carries information necessary for receiving data via a high speed-downlink shared channel (HS-DSCH).

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

12. The IC of claim 9 further comprising:

(f) means for generating a bit error rate (BER) for each HS-SCCH;

(g) means for comparing each BER to a predetermined threshold; and

(h) means for determining the HS-SCCH having the lowest BER.