Waveform quality feedback for the selection of gateways
View Patent ↗Techniques are disclosed for selecting transmission resources in a telecommunications system that comprises different networks, where the techniques are based on the quality of the waveform of transmitted media such as audio or video signals, in contrast to the quality of service of the network that transports the media. The problem with only using quality of service to determine which resources to allocate to a call is that quality of service does not guarantee that the quality experienced by the call's participants is satisfactory just because a component network's quality of service is satisfactory. For example, the end-to-end delay experienced in a VoIP network might be satisfactory for most data transfers, but might still be inadequate to control the echo experienced by telecommunications users. The disclosed techniques evaluate the waveform quality (i.e., in terms of loudness, noise, echo, and so forth) of media that is transmitted along a path and allocate alternative resources accordingly.
1. A method comprising:
evaluating, by a first endpoint, the waveform quality of a media signal that is transmitted by the first endpoint along a first communication path from a first node to a second node, wherein the first communication path traverses: (i) a first network that is packet-switched, (ii) a first gateway that is contiguous with the first network, and (iii) a second gateway that is non-contiguous with the first network;
when the waveform quality is determined to be unsatisfactory regardless of a quality-of-service of the first communication path, transmitting, by the first endpoint a first packet along a second communication path from the first node to the second node, wherein the second communication path traverses the first network and at least one of: (i) a third gateway that is contiguous with the first network, and (ii) a fourth gateway that is non-contiguous with the first network;
wherein the first communication path fails to provide a quality-of-service guarantee;
wherein the evaluating comprises (i) receiving from the first gateway a measurement of the waveform quality of the media signal, and (ii) comparing the measurement to a predetermined requirement to determine whether the waveform quality is satisfactory or unsatisfactory;
evaluating the waveform quality of media that is transmitted along a third communication path from the first node to the second node, wherein the third communication path traverses the first network and at least one of the third gateway and the fourth gateway;
when the waveform quality of media transmitted along the third communication path is more advantageous than the waveform quality of media transmitted along the second communication path, transmitting a second packet along the third communication path from the first node to the second node;
wherein the third communication path fails to provide a quality-of-service guarantee;
re-evaluating the waveform quality of media that is transmitted along the first communication path from the first node to the second node; and
when the waveform quality of media transmitted along the first communication path is satisfactory, transmitting a third packet along the first communication path from the first node to the second node.
2. The method of claim 1 wherein the first gateway and the second gateway are contiguous with a second network, and wherein the communication protocols of the first network and the second network are different.
3. The method of claim 2 wherein the second network is the Public Switched Telephone Network.
4. The method of claim 2 wherein the first network is Internet Protocol-based.
5. The method of claim 1 wherein the evaluating is based on the quality of service of the first communication path being satisfactory.
6. The method of claim 1 wherein the evaluating of the waveform quality of the media signal that is transmitted along the first communication path is performed with respect to one or more of echo, noise, loudness, and audio distortion.
7. The method of claim 1 wherein the evaluating of the waveform quality of the media signal that is transmitted along the first communication path is performed with respect to one or more of fading, crosstalk, and video distortion.
8. A method comprising:
transmitting by a first endpoint a first packet along a first communication path from the first node to the second node, wherein the first communication path traverses: (i) a first network that is packet-switched, (ii) a first gateway that is contiguous with the first network, and (iii) a second gateway that is non-contiguous with the first network;
evaluating the waveform quality of a media signal that is transmitted by the first endpoint along the first communication path;
evaluating the waveform quality of the media signal that is transmitted by the first endpoint along a second communication path from the first node to the second node, wherein the second communication path traverses the first network and at least one of: (i) a third gateway that is contiguous with the first network, and (ii) a fourth gateway that is non-contiguous with the first network;
when the waveform quality of the media signal that is transmitted along the second communication path is more advantageous than the waveform quality of the media that is transmitted along the first communication path, transmitting a second packet along the second communication path from the first node to the second node;
wherein the second communication path fails to provide a quality-of-service guarantee;
wherein (i) the evaluating associated with the first communication path and (ii) the evaluating associated with the second communication path are both based on the quality-of-service of the first communication path being satisfactory;
evaluating the waveform quality of media that is transmitted along a third communication path from the first node to the second node, wherein the third communication path traverses the first network and at least one of the third gateway and the fourth gateway;
when the waveform quality of media transmitted along the third communication path is more advantageous than the waveform quality of media transmitted along the second communication path, transmitting a third packet along the third communication path from the first node to the second node;
wherein the third communication path fails to provide a quality-of-service guarantee;
re-evaluating the waveform quality of media that is transmitted along the first communication path from the first node to the second node; and
when the waveform quality of media transmitted along the first communication path is satisfactory, transmitting a fourth packet along the first communication path from the first node to the second node.
9. The method of claim 8 wherein the first gateway and the second gateway are contiguous with a second network, wherein the communication protocols of the first network and the second network are different.
10. The method of claim 9 wherein the second network is the Public Switched Telephone Network.
11. The method of claim 9 wherein the first network is Internet Protocol-based.
12. The method of claim 8 wherein the evaluating of the waveform quality of media that is transmitted along the first communication path is performed with respect to one or more of echo, noise, loudness, and audio distortion.
13. The method of claim 8 wherein the evaluating of the waveform quality of media that is transmitted along the first communication path is performed with respect to one or more of fading, crosstalk, and video distortion.
14. A method comprising:
transmitting, by a first endpoint, a first packet along a first communication path from a first node to a second node, wherein the first communication path traverses: (i) a first network that is packet-switched, (ii) a first gateway that is contiguous with the first network, and (iii) a second gateway that is non-contiguous with the first network;
evaluating the waveform quality of a media signal that is transmitted along the first communication path, along a second communication path from the first node to the second node, and along a third communication path from the first node to the second node, wherein the second communication path and the third communication path are different, and wherein each of the second communication path and the third communication path traverses the first network and at least one of: (i) a third gateway that is contiguous with the first network, and (ii) a fourth gateway that is non-contiguous with the first network;
when the waveform quality of the media signal that is transmitted along the second communication path is determined to be more advantageous than both (i) the waveform quality of the media signal that is transmitted along first communication path and (ii) the waveform quality of the media signal that is transmitted along the third communication path, transmitting a second packet along the second communication path from the first node to the second node;
wherein the second communication path fails to provide a quality-of-service guarantee;
wherein the determination of whether the waveform quality of the media signal along the second communication path is more advantageous is based on a quality-of-service of the second communication path being satisfactory;
when the waveform quality of media transmitted along the third communication path is more advantageous than the waveform quality of media transmitted along the second communication path, transmitting a third packet along the third communication path from the first node to the second node;
wherein the third communication path fails to provide a quality-of-service guarantee;
re-evaluating the waveform quality of media that is transmitted along the first communication path from the first node to the second node; and
when the waveform quality of media transmitted along the first communication path is satisfactory, transmitting a fourth packet along the first communication path from the first node to the second node.
15. The method of claim 14 wherein the first gateway and the second gateway are contiguous with a second network, wherein the communication protocols of the first network and the second network are different.
16. The method of claim 15 wherein the second network is the Public Switched Telephone Network.
17. The method of claim 15 wherein the first network is Internet Protocol-based.
18. The method of claim 14 wherein the evaluating of the waveform quality of media that is transmitted along the first communication path is performed with respect to one or more of echo, noise, loudness, and audio distortion.
19. The method of claim 14 wherein the evaluating of the waveform quality of media that is transmitted along the first communication path is performed with respect to one or more of fading, crosstalk, and video distortion.