Dedicated control channel detection for enhanced dedicated channel
View Patent ↗In a method of detecting a signal, a control channel associated with a physical channel may be decoded to produce at least one decoding metric. A control channel signal on the control channel may then be detected based on the decoding metric.
1. A method of detecting a signal, comprising:
decoding, at a decoder, a control channel associated with a data channel to produce at least one decoding metric, the decoding metric representing the likelihood that a codeword among a plurality of codewords is present on the control channel;
calculating an energy metric based on the plurality of codewords; and
detecting, at a detector, whether a control channel signal is present on the decoded control channel based on the energy metric and a threshold, the threshold being based on a number of codewords in a codebook; wherein
the detecting of the presence of the control channel signal on the decoded control channel is indicative of whether a data signal is present on the associated data channel.
2. The method of claim 1 , wherein the decoding metric is a correlation representing the likelihood that a respective codeword among a plurality of codewords is present in a signal received on the control channel.
3. The method of claim 2 , wherein the decoding metric is a highest correlation for the plurality of codewords.
4. The method of claim 3 , wherein
the energy metric is based on the highest correlation.
5. The method of claim 4 , wherein the calculating step further comprises:
squaring the highest correlation to generate an energy value; and
normalizing the energy value to generate the energy metric.
6. The method of claim 5 , wherein the normalized energy value is generated based on a signal energy and noise energy for a frame received on the control channel.
7. The method of claim 1 , wherein the threshold is dependent on a number of the codewords in the plurality of codewords associated with the decoded control channel.
8. The method of claim 1 , wherein the threshold is dependent on a transport format set size associated with a frame received on the decoded control channel.
9. The method of claim 1 , wherein the threshold is determined based on a maximum number of transmissions for a transport channel packet.
10. The method of claim 1 , wherein
the detecting step detects that the control channel signal is present on the decoded control channel if the energy metric is greater than or equal to the threshold.
11. The method of claim 1 , further comprising:
generating an indicator indicative of whether the control channel signal is present on the decoded control channel based on the detecting step; and
determining whether to process data received on a data channel associated with the decoded control channel based on the generated indicator.
12. The method of claim 1 , wherein the data channel is an enhanced dedicated channel.
13. An apparatus for detecting a signal, comprising:
a decoder configured to decode a control channel associated with a data channel to produce at least one decoding metric, the decoding metric representing the likelihood that a codeword among a plurality of codewords is present on the control channel; and
a detector configured to calculate an energy metric based on the plurality of codewords and to detect whether a control channel signal is present on the decoded control channel based on the energy metric and a threshold, the threshold being based on a number of codewords in a codebook; wherein
the detecting of the presence of the control channel signal on the decoded control channel is indicative of whether a data signal is present on the associated data channel.
14. The apparatus of claim 13 , wherein the decoding metric is a correlation representing the likelihood that a respective codeword among a plurality of codewords is present in a signal received on the control channel.
15. The apparatus of claim 14 , wherein the decoding metric is a highest correlation for the plurality of codewords.
16. The apparatus of claim 15 , wherein the energy metric is based on the highest correlation.
17. The apparatus of claim 13 , wherein the detector detects that the control channel signal is present on the decoded control channel if the energy metric is greater than or equal to the threshold.
18. The apparatus of claim 13 , wherein the threshold is dependent on a number of the codewords in the plurality of codewords associated with the decoded control channel.
19. The apparatus of claim 13 , wherein the threshold is dependent on a transport format set size associated with a frame received on the control channel.
20. The apparatus of claim 13 , wherein the threshold is determined based on a maximum number of transmissions for a transport channel packet.