Power efficient paging channel decoding
View Patent ↗Disclosed are various embodiments of extracting a paging message from paging channel downlink communications. A first and second page bursts and received. When the signal to noise ratio of the first and second bursts exceeds a threshold, a Viterbi decoder is executed and an error checking code calculated to determine whether the paging message is successfully extracted. If not, a third page burst is received and a Viterbi decoder executed to extract the paging message.
1. A wireless communication device, comprising:
at least one radio frequency (RF) transceiver configured to receive a first encoded paging burst and a second encoded paging burst;
a baseband processor configured to:
identify a first signal to noise ratio of the first encoded paging burst; identify a second signal to noise ratio of the second encoded paging bust;
extract a first encoded signal from the first encoded paging burst and the second encoded paging burst when the first signal to noise ratio and the second signal to noise ratio exceed a predefined threshold;
calculate an error checking value associated with the first encoded signal; determine whether an embedded error checking value decoded from the first encoded signal matches the error checking value; and
initiate processing of a third encoded paging burst when the error checking value does not match the embedded error checking value.
2. The system of claim 1 , wherein the baseband processor is configured to extract the first encoded signal from the first encoded paging burst and the second encoded paging burst by executing a Viterbi decoder.
3. The system of claim 1 , wherein the baseband processor is further configured to:
initiate processing of a third encoded paging burst when the error checking value does not match the embedded error checking value; and
extract a second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst.
4. The system of claim 1 , wherein the baseband processor is further configured to:
initiate processing of a third encoded paging burst when at least one of the first signal to noise ratio and the second signal to noise ratio does not exceed the threshold; and
extract a second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst.
5. The system of claim 4 , wherein the baseband processor is configured to extract the second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst by executing a Viterbi decoder.
6. The system of claim 1 , wherein the encoded signal is encoded using a ½ rate convolutional code.
7. The system of claim 1 , wherein the first paging burst and the second paging burst are received in a Group System Mobile (GSM) paging channel.
8. The system of claim 1 , wherein the threshold is based at least in part upon a probability that the embedded error checking value decoded from the first encoded signal matches the error checking value.
9. The system of claim 1 , wherein the embedded error checking value decoded from the first encoded signal further comprises a cyclic redundancy check code based upon the first encoded signal.
10. A method executed in a wireless terminal for extracting an encoded signal from a wireless signal, comprising the steps of:
receiving a first encoded paging burst and a second encoded paging burst;
identifying a first signal to noise ratio of the first encoded paging burst;
identifying a second signal to noise ratio of the second encoded paging bust;
extracting a first encoded signal from the first encoded paging burst and the second encoded paging burst when the first signal to noise ratio and the second signal to noise ratio exceed a predefined threshold;
calculating an error checking value associated with the first encoded signal;
determining whether an embedded error checking value decoded from the first encoded signal matches the error checking value; and
initiating processing of a third encoded paging burst when the error checking value does not match the embedded error checking value.
11. The method of claim 10 , wherein the step of extracting the first encoded signal from the first encoded paging burst and the second encoded paging further comprises executing a Viterbi decoder on a designated slot of the first encoded paging burst and a corresponding designated slot of the second encoded paging burst.
12. The method of claim 10 , further comprising the steps of:
initiating processing of a third encoded paging burst when the error checking value does not match the embedded error checking value; and
extracting a second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst.
13. The method of claim 10 , further comprising the steps of:
initiating processing of a third encoded paging burst when at least one of the first signal to noise ratio and the second signal to noise ratio does not exceed the threshold; and
extracting a second encoded signal from a designated slot of the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst.
14. The method of claim 13 , further comprising the step of extracting the second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst by executing a Viterbi decoder.
15. The method of claim 10 , wherein the encoded signal is encoded using a ½ rate convolutional code.
16. The method of claim 10 , wherein the first paging burst and the second paging burst are received in a Group System Mobile (GSM) paging channel.
17. The method of claim 10 , wherein the threshold is based at least in part upon a probability that the embedded error checking value decoded from the first encoded signal matches the error checking value.
18. The method of claim 10 , wherein the embedded error checking value decoded from the first encoded signal further comprises a cyclic redundancy check code based upon the first encoded signal.
19. A computer program product comprising instructions stored in a non-transitory computer-readable storage medium, the instructions, comprising:
instructions to receive a first encoded paging burst and a second encoded paging burst;
instructions to identify a first signal to noise ratio of the first encoded paging burst;
instructions to identify a second signal to noise ratio of the second encoded paging bust;
instructions to extract a first encoded signal from the first encoded paging burst and the second encoded paging burst exclusively when the first signal to noise ratio and the second signal to noise ratio exceed a predefined threshold;
instructions to calculate an error checking value associated with the first encoded signal;
instructions to determine whether an embedded error checking value decoded from the first encoded signal matches the error checking value; and
instructions to initiate processing of a third encoded paging burst exclusively when the error checking value does not match the embedded error checking value.
20. The computer program product of claim 19 , the instructions further comprising:
instructions to initiate processing of a third encoded paging burst when the error checking value does not match the embedded error checking value; and
instructions to extract a second encoded signal from the first encoded paging burst, the second encoded paging burst, and the third encoded paging burst.