Method for suppressing silence in voice traffic over a wireless communication medium
View Patent ↗A method and system for increasing the efficiency of providing bandwidth for voice traffic to a data provider via wireless communication mediums is provided. This is generally accomplished by not transmitting any data during the silence periods and playing out background noise (i.e., comfort noise) at the other end, to obtain significant bandwidth savings.
1. A method for suppressing silence in bi-directional communications between a centralized node and a plurality of remote nodes over a wireless network, comprising:
detecting a silent period associated with voice communications received from one of the plurality of remote nodes over a wireless channel, the wireless channel carrying data transmitted from the plurality of remote nodes to the centralized node; and
deactivating unsolicited grant service to the one of the plurality of remote nodes and not activating request polling responsive to the detection of the silent period.
2. The method of claim 1 , wherein detecting the silent period comprises receiving a voice packet that includes a silence flag, wherein the silence flag indicates the beginning of the silence period.
3. The method of claim 2 , wherein receiving a voice packet that includes a silence flag comprises receiving a voice packet that includes a voice packet header, the voice packet header including the silence flag.
4. The method of claim 3 , wherein receiving a voice packet that includes a voice packet header comprises receiving a voice packet that includes a compressed voice packet header.
5. The method of claim 2 , wherein receiving the voice packet comprises receiving the voice packet as part of a bandwidth region automatically allocated to the one of the plurality of remote nodes in accordance with unsolicited grant service.
6. The method of claim 1 , wherein detecting the silent period comprises determining that a number of bandwidth grants unused by the one of the plurality of remote nodes exceeds a predetermined threshold.
7. The method of claim 1 , further comprising:
receiving a reactivation message from the one of the plurality of remote nodes; and
reactivating unsolicited grant service to the one of the plurality of remote nodes responsive to receipt of the reactivation message.
8. The method of claim 7 , wherein receiving the reactivation message comprises receiving a bandwidth request.
9. The method of claim 7 , wherein receiving the reactivation message comprises receiving the reactivation message in a contention region.
10. The method of claim 7 , wherein receiving the reactivation message comprises receiving a piggyback request.
11. The method of claim 1 , wherein detecting a silent period comprises detecting a silent period associated with voice over packet communications received from one of the plurality of remote nodes over a wireless channel.
12. The method of claim 1 , wherein detecting a silent period comprises detecting a silent period associated with voice over internet protocol communications received from one of the plurality of remote nodes over a wireless channel.
13. The method of claim 1 , wherein detecting a silent period comprises receiving a first signal from a voice activity detector within the one of the plurality of remote nodes over the wireless channel.
14. The method of claim 13 , further comprising:
receiving a second signal from the voice activity detector within the one of the plurality of remote nodes over the wireless channel; and
reactivating unsolicited grant service to the one of the plurality of remote nodes responsive to receipt of the second signal.
15. A method for compressing silence in bi-directional communications between a centralized node and a plurality of remote nodes over a wireless network, comprising:
providing a first level of unsolicited grant service to one of the plurality of remote nodes, wherein the first level of unsolicited grant services satisfies a first bandwidth requirement;
detecting a silent period associated with voice communications received from the one of the plurality of remote nodes over a wireless channel, the wireless channel carrying data transmitted from the plurality of remote nodes to the centralized node; and
providing a second level of unsolicited grant service to the one of the plurality of remote nodes responsive to detecting the silent period, wherein the second level of unsolicited grant service satisfies a second bandwidth requirement that is less than the first bandwidth requirement.
16. The method of claim 15 , wherein detecting the silent period comprises receiving a voice packet that includes a silence flag, wherein the silence flag indicates the beginning of the silent period.
17. The method of claim 16 , wherein receiving a voice packet that includes a silence flag comprises receiving a voice packet that includes a voice packet header, the voice packet header including the silence flag.
18. The method of claim 17 , wherein receiving a voice packet that includes a voice packet header comprises receiving a voice packet that includes a compressed voice packet header.
19. The method of claim 16 , wherein receiving the voice packet comprises receiving the voice packet as part of a bandwidth region automatically allocated to the one of the plurality of remote nodes in accordance with the first level unsolicited grant service.
20. The method of claim 15 , wherein detecting the silent period comprises determining that a number of bandwidth grants unused by the one of the plurality of remote nodes exceeds a predetermined threshold.
21. The method of claim 15 , further comprising:
receiving a reactivation message from the one of the plurality of remote nodes; and
reinstating the first level of unsolicited grant service to the one of the plurality of remote nodes responsive to receipt of the reactivation message.
22. The method of claim 21 , wherein receiving the reactivation message comprises receiving a bandwidth request.
23. The method of claim 21 , wherein receiving the reactivation message comprises receiving the reactivation message in a contention region.
24. The method of claim 21 , wherein receiving the reactivation message comprises receiving a piggyback request.
25. The method of claim 15 , wherein detecting a silent period comprises detecting a silent period associated with voice over packet communications received from one of the plurality of remote nodes over a wireless channel.
26. The method of claim 15 , wherein detecting a silent period comprises detecting a silent period associated with voice over internet protocol communications received from one of the plurality of remote nodes over a wireless channel.
27. The method of claim 15 , wherein detecting a silent period comprises receiving a first signal from a voice activity detector within the one of the plurality of remote nodes over the wireless channel.
28. The method of claim 27 , further comprising:
receiving a second signal from the voice activity detector within the one of the plurality of remote nodes over the wireless channel; and
reinstating the first level of unsolicited grant service to the one of the plurality of remote nodes responsive to receipt of the second signal.
29. A method for suppressing silence in bi-directional communications between a centralized node and a plurality of remote nodes over a wireless network, comprising:
receiving unsolicited bandwidth grants from the centralized node at one of the plurality of remote nodes, the unsolicited bandwidth grants for supporting voice communications between the one of the plurality of remote nodes and the centralized node;
sending a first message from the one of the remote nodes to the centralized node, wherein the first message is indicative of a silent period associated with the voice communications;
responsive to sending the first message, ceasing to receive unsolicited bandwidth grants from the centralized node by the one of the remote nodes;
sending a second message in a priority contention minislot from the one of the plurality of remote nodes to the centralized node, wherein the second message is indicative of an end of the silent period associated with the voice communications; and
resuming the reception of unsolicited bandwidth grants from the centralized node at one of the plurality of remote nodes responsive to sending the second message.
30. A method for compressing silence in bi-directional communications between a centralized node and a plurality of remote nodes over a wireless network, comprising:
receiving a first level of unsolicited grant service from the centralized node by one of the plurality of remote nodes, wherein the first level of unsolicited grant services satisfies a first bandwidth requirement;
signaling a silent period associated with voice communications transmitted from the one of the plurality of remote nodes to the centralized node over a wireless channel, the wireless channel carrying data transmitted from the plurality of remote nodes to the centralized node; and
receiving a second level of unsolicited grant service from the centralized node by the one of the plurality of remote nodes responsive to signaling the silent period, wherein the second level of unsolicited grant service satisfies a second bandwidth requirement that is less than the first bandwidth requirement.