GRACEFUL DEGRADATION FOR VOICE COMMUNICATION SERVICES OVER WIRED AND WIRELESS NETWORKS

• US 20090103476A1
• Filed: 09/17/2008
• Published: 04/23/2009
• Est. Priority Date: 10/19/2007
• Status: Active Grant

• Current Assignee: Voxer IP LLC (Voxer, Inc.)
• Original Assignee: Rebelvox LLC (Voxer, Inc.)
• Inventors: Katis, Thomas E., Panttaja, Mary G., Ranney, Matthew J., Panttaja, James T.
• Granted Patent: US 7,751,361 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 12/1827 Network arrangements for conference optimisation or adaptation
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 51/04 Real-time or near real-time messaging, e.g. instant messaging [IM]
• CPC Class Codes: H04L 51/226 Delivery according to priorities
• CPC Class Codes: H04L 65/1083 In-session procedures
• CPC Class Codes: H04L 65/4015 where at least one of the additional parallel sessions is real time or time sensitive, e.g. white board sharing, collaboration or spawning of a subconference
• CPC Class Codes: H04L 65/4053 without floor control
• CPC Class Codes: H04L 65/764 at the destination reformatting of additional data in video clients H04N21/4355

Abstract

A method for gracefully extending the range and/or capacity of voice communication systems is disclosed. The method involves the persistent storage of voice media on a communication device. When the usable bit rate on the network is poor and below that necessary for conducting a live conversation, voice media is transmitted and received by the communication device at the available usable bit rate on the network. Although latency may be introduced, the persistent storage of both transmitted and received media of a conversation provides the ability to extend the useful range of wireless networks beyond what is required for live conversations. In addition, the capacity and robustness in not being affected by external interferences for both wired and wireless communications is improved.

Claims

1. A method for extending the usable range and/or capacity of a network, comprising:

receiving voice media generated while using the communication device, the communication device configured to be connected to the network through a network connection between the network and the communication device;

encoding the voice media to generate a full bit rate representation of the media generated while using the communication device;

storing the full bit rate representation of the voice media generated while using the communication device;

ascertaining if the usable bit rate on the network connection falls below a bit rate threshold, the bit rate threshold defining a minimum bit rate throughput sufficient for maintaining near real-time communication;

transmitting the voice media generated using the communication device from storage when the ascertained usable bit rate is below the bit rate threshold, the voice media being transmitted at a bit rate below the bit rate threshold, thereby effectively extending the usable range and/or capacity of the network connection for voice communication when the ascertained usable bit rate falls below the bit rate threshold;

receiving voice media over the network connection;

storing the voice media received over the network connection; and

providing the ability to render the voice media received over the network connection when the voice media received over the network connection is of sufficient completeness that it will be decipherable when rendered.

2. The method of claim 1, wherein ascertaining if the usable bit rate on the network connection falls below the bit rate threshold further comprises:

receiving one or more reports each including a measured transfer rate at which bits transmitted over the network connection safely arrive at a recipient over a predetermined period of time;

computing the usable bit rate on the network connection based on the received one or more reports; and

comparing the computed usable bit rate with the bit rate threshold.

3. The method of claim 1, wherein the minimum bit rate throughput sufficient for maintaining near real-time communication is at least 80% of the bit rate throughput needed to transmit and decode the full bit rate representation of the voice media at the same rate the voice media was originally encoded.

4. The method of claim 1, further comprising:

ascertaining when the usable bit rate on the network connection exceeds the bit rate threshold; and

transmitting the full bit rate representation of the voice media generated using the communication device without introducing latency when the ascertained usable bit rate exceeds the bit rate threshold.

5. The method of claim 4, wherein transmitting the full bit rate representation of the voice media further comprises:

(i) defining a transmission loop;

(ii) ascertaining the voice media generated using the communication device available for transmission in the defined transmission loop; and

(iii) transmitting the full bit rate representation of the available voice media generated using the communication device during the transmission loop.

6. The method of claim 5, further comprising defining successive transmission loops and repeating (i) through (iii) for each loop.

7. The method of claim 1, wherein transmitting the voice media generated while using the communication device from storage further comprises varying the amount of latency during the transmission as needed so that the transmission bit rate substantially meets the usable bit rate on the network connection when the ascertained usable bit rate falls below the bit rate threshold.

8. The method of claim 1, wherein transmitting the voice media generated using the communication device from storage further comprises:

defining a transmission loop;

determining if the ascertained usable bit rate is not sufficient to transmit the available voice media in the defined transmission loop;

ascertaining time-sensitive voice media among all the available voice media ready for transmission, the time-sensitivity of the voice media being determined by an intent of a recipient to review the voice media upon receipt; and

transmitting only the available time-sensitive voice media if the ascertained usable bit rate is sufficient to transmit only the available time-sensitive voice media.

9. The method of claim 8, further comprising:

determining if the ascertained usable bit rate is not sufficient to transmit only the available time-sensitive voice media;

generating a reduced bit rate representation of the available time-sensitive voice media; and

transmitting the reduced bit rate representation of the available time-sensitive voice media.

10. The method of claim 9, wherein generating the reduced bit rate representation further comprises using fewer bits per unit of time when packetizing the available time-sensitive voice media.

11. The method of claim 9, wherein generating the reduced bit rate representation of the available time-sensitive voice media comprises using (a) one or more different codec settings, (b) one or more different codecs, (c) a compression algorithm;

or (d) any combination of (a) through (c) when packetizing the media for transmission.

12. The method of claim 9, wherein generating the reduced bit rate representation of the available time-sensitive voice media comprises increasing the packetization interval used to transmit the available time-sensitive voice media.

13. The method of claim 9, wherein generating the reduced bit rate representation further comprises adjusting the transmission rate at which packets containing the available time-sensitive voice media are transmitted.

14. The method of claim 9, wherein generating the reduced bit rate representation of the available time-sensitive voice media further comprises performing one or more of the following:

(i) using fewer bits per unit of time when packetizing the reduced bit rate representation of the available time-sensitive voice media relative to the full bit rate representation;

(ii) increasing the packetization interval when transmitting the available time-sensitive voice media;

(iii) adjusting the rate at which packets containing the available time-sensitive voice media are transmitted;

or

(iv) any combination of (i) through (iii).

15. The method of claim 8 further comprising:

defining successive transmission loops; and

performing the method of claims 8, 9 and 14 as needed for each of the successive transmission loops.

16. The method of claim 1, further comprising;

(i) maintaining a data quality store;

(ii) noting any missing, corrupted or reduced bit rate versions of the voice media received over the network connection in the data quality store; and

(iii) transmitting from the communication device over the network connection requests for retransmission of any voice media noted in the data quality store.

17. The method of claim 16, further comprising:

(iv) removing the notation from the data quality store as the requests for retransmission are satisfied; and

(v) repeating (i) through (iv) until a complete copy of the voice media received over the network connection is received and stored, wherein the complete copy is a full bit rate representation of the voice media as it was originally encoded.

18. The method of claim 1, wherein the usable range of the network connection is effectively extended when the ascertained usable bit rate falls below the bit rate threshold to just above the point before the usable bit rate on the network connection is substantially reduced to nothing.

19. The method of claim 1, further comprising:

ascertaining when the usable bit rate on the network connection is substantially reduced to nothing;

storing voice media generated using the communication device when the usable bit rate on the network connection is substantially reduced to nothing;

delaying the transmission of the voice media generated using the communication device when the usable bit rate on the network connection is substantially reduced to nothing; and

transmitting the voice media from storage after the delay as the usable bit rate on the network connection increases.

20. The method of claim 1, further comprising defining a conversation and ascertaining the voice media generated using the communication device and the voice media received over the network connection associated with the conversation.

21. The method of claim 1, further comprising persistently storing the voice media generated using the communication device and the voice media received over the network connection in a time-based format.

22. The method of claim 1, further comprising providing the ability to review the stored voice media in a time-shifted mode by retrieving the stored media from storage and rendering the retrieved media on the communication device.

23. The method of claim 1, wherein providing the ability to render the voice media received over the network connection further comprises rendering the media on the communication device as it is received over the network connection in a near real-time mode.

24. The method of claim 1, further comprising persistently storing the full bit rate representation of the media generated using the communication device and voice media received over the network connection at the communication device.

25. The method of claim 1, further comprising persistently storing the full bit rate representation of the media generated using the communication device and voice media received over the network connection on the network at a location remote from the communication device.

26. The method of claim 1, wherein the network connection is a wireless network connection and the transmitting the voice media generated using the communication device from storage at the bit rate below the bit rate threshold to effectively extends the usable range and/or capacity of the wireless network connection.

27. The method of claim 1, wherein the network connection is a wired network connection and the transmitting the voice media generated using the communication device from storage at the bit rate below the bit rate threshold to effectively extends the usable capacity of the wired network connection.

28. The method of claim 1, wherein the communication device comprises one of the following:

land-line phone, wireless phone, cellular phone, satellite phone, computer, radio, server, satellite radio, tactical radio or tactical phone.

29. The method claim 1, further comprising transmitting and receiving, in addition to the voice media, one or more of the following types of media:

video, text, sensor data, position or GPS information, radio signals, or a combination thereof.

30. The method of claim 1, wherein the media generated using the communication device and the media received over the network connection are persistently stored on the communication device.

31. The method of claim 1, wherein the media generated using the communication device and the media received over the network connection are persistently stored on the network.