Method and system for vocoder bypass based on loads in coverage areas of a wireless wide area network

• US 8,213,953 B1
• Filed: 12/06/2007
• Issued: 07/03/2012
• Est. Priority Date: 05/11/2004
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Mangal, Manish
• Primary Examiner(s): Miller, Brandon
• Application Number:
  US11/951,630
• Time in Patent Office: 1,671 Days
• Field of Search: 455/453, 455/414.1, 455/426.1, 455417-420, 455423-424, 455517-519, 455/445, 455/452.2, 455/560, 370/466, 370/335, 370/342, 370/329, 370/328, 370/338
• US Class Current: 455/453
• CPC Class Codes: H04M 2207/18 wireless networks
• CPC Class Codes: H04M 7/0057 Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/0072 Speech codec negotiation H04L65/1069 takes precedence

Abstract

The load of a coverage area in a wireless wide area network can be used as a basis to determine which vocoder to use in establishing a call between a wireless device in that coverage area and a wireless device in a different coverage area. If the load of the coverage area is above a threshold, then a higher-compression vocoder may be used during the call for communications between the wireless device and an access point serving the wireless device in that coverage area. However, if the load of the coverage area is below the threshold, then a lower-compression vocoder may be used during the call for communications between the wireless device and the access point.

Claims

1. A method in a wireless wide area network, the method comprising:

receiving a request to originate a call from a first wireless device to a second wireless device, wherein the first wireless device is in a first coverage area served by a first access point of a first serving system and the second wireless device is in a second coverage area served by a second access point of a second serving system;

determining a current load of the first coverage area;

based on the current load of the first coverage area, the first serving system selecting a plurality of first-device vocoders that are supported by the first wireless device;

the first serving system sending an indication of the plurality of first-device vocoders to the second serving system;

the second serving system determining one or more second-device vocoders that are supported by the second wireless device;

the second serving system comparing the plurality of first-device vocoders against the one or more second-device vocoders to determine whether any of the first-device vocoders match any of the second-device vocoders; and

in response to a vocoder match, the second serving system sending the first serving system an indication that the call can be established with vocoder bypass and an indication of which vocoder in the plurality of first-device vocoders to use for the call.

2. The method of claim 1, further comprising establishing the call with vocoder bypass via a packet-switched network, wherein establishing the call with vocoder bypass comprises establishing the call with transcoder-free operation.

3. The method of claim 1, further comprising establishing the call with vocoder bypass via a circuit switched network, wherein establishing the call with vocoder bypass comprises establishing the call with tandem free-operation.

4. The method of claim 1, wherein determining a current load of the first coverage area comprises determining a number of wireless devices being served by the first access point.

5. The method of claim 1, wherein determining a current load of the first coverage area comprises determining an amount of unused bandwidth available to allocate to wireless devices.

6. The method of claim 1, wherein determining a current load of the first coverage area comprises determining an amount of bandwidth allocated to wireless devices being served by the first access point.

7. The method of claim 1, further comprising:

identifying all supported vocoders that are supported by the first wireless device; and

comparing the current load of the first coverage area to a predetermined threshold.

8. The method of claim 7, wherein based on the current load of the first coverage area, selecting a plurality of first-device vocoders supported by the first wireless device comprises:

determining that the current load of the first coverage area is below the predetermined threshold; and

in response, selecting all of the supported vocoders as the plurality of first-device vocoders.

9. The method of claim 7, wherein based on the current load of the first coverage area, selecting a plurality of first-device vocoders supported by the first wireless device comprises:

determining that the current load of the first coverage area is above the predetermined threshold; and

in response, selecting less than all of the supported vocoders as the plurality of first-device vocoders.

10. The method of claim 7, wherein the supported vocoders include a Selectable Mode Vocoder and an Enhanced Variable Rate Codec.

11. The method of claim 1, wherein the first serving system comprises a first mobile switching center (MSC) and the second serving system comprises a second MSC.

12. The method of claim 1, wherein the second serving system determining one or more second-device vocoders that are supported by the second wireless device comprises:

the second serving system determining that the second wireless device should use a particular vocoder based on a current load of the second wireless coverage area.

13. The method of claim 1, wherein the indication of which vocoder in the plurality of first-device vocoders to use for the call comprises an indication of a particular second-device vocoder that matches one of the plurality of first-device vocoders.

14. The method of claim 13, wherein the one or more second-device vocoders comprises a plurality of second-device vocoders.