Method and system for managing bandwidth based on intraframes

• US 8,249,141 B1
• Filed: 07/13/2007
• Issued: 08/21/2012
• Est. Priority Date: 07/13/2007
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Harris, David L., Lima, Claudio R.
• Primary Examiner(s): Flynn, Nathan
• Assistant Examiner(s): Su, Sarah
• Application Number:
  US11/777,786
• Time in Patent Office: 1,866 Days
• Field of Search: 375/240, 375/240.01, 375/240.02, 382/232, 382/236, 382/239
• US Class Current: 375/240.01
• CPC Class Codes: H04L 65/752 adapting media to network capabilities
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04N 19/102 characterised by the element, parameter or selection affected or controlled by the adaptive coding
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 21/21805 enabling multiple viewpoints, e.g. using a plurality of cameras
• CPC Class Codes: H04N 21/2187 Live feed
• CPC Class Codes: H04N 21/2343 involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements video transcoding H04N19/40; media packet handling at the source H04L65/762
• CPC Class Codes: H04N 21/2385 Channel allocation H04N21/266 takes precedence; Bandwidth allocation H04N21/24 takes precedence ; allocation of channels according to the instantaneous demands of the users in time-division multiplex systems H04J3/1682; admission control, resource allocation in open networks H04L12/5692; arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896; negotiating bandwidth in wireless networks H04W28/16
• CPC Class Codes: H04N 21/2662 Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
• CPC Class Codes: H04N 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream

Abstract

A method and system of managing QoS for a plurality of video capture devices coupled to a common communication link. A CU coupled between the video capture devices and the communication link may provide each video capture device a respective level of QoS over the communication link. The CU may then receive a video stream from a given video capture device. Thereafter, the CU may detect a predefined minimum threshold rate of intraframes in the video stream and responsively adjust QoS over the communication link to increase a respective level of QoS provided to the given video capture device. In turn, the CU may send the video stream over the communication link with the increased respective level of QoS. Subsequently, the CU may adjust QoS over the communication link to decrease a respective level of QoS provided to the given video capture device.

Claims

1. A method of managing quality of service for a plurality of video capture devices coupled to a network via a common communication link, the method comprising:

providing each of the plurality of video capture devices a respective level of quality of service over the common communication link;

receiving a first video stream from a first video capture device of the plurality of video capture devices over a first communication link, wherein the first video stream comprises one or more frames;

detecting a predefined minimum threshold rate of intraframes in the first video stream;

in response to detecting the predefined minimum threshold rate of intraframes, adjusting quality of service over the common communication link to increase a first level of quality of service provided to the first video capture device; and

sending the first video stream to the network over the common communication link with the increased first level of quality of service.

2. The method of claim 1, wherein detecting the predefined threshold rate of intraframes comprises:

calculating a rate of intraframes in the first video stream; and

comparing the calculated rate of intraframes in the first video stream to the predefined minimum threshold rate of intraframes.

3. The method of claim 2, wherein calculating the rate of intraframes in the first video stream comprises:

determining a first number of intraframes received during a given time period;

determining a second number of all frames received during the given time period; and

dividing the first number by the second number.

4. The method of claim 2, wherein comparing the calculated rate of intraframes in the first video stream to the predefined minimum threshold rate of intraframes comprises comparing the calculated rate of intraframes in the first video stream to the predefined minimum threshold rate of intraframes only after first receiving a minimum threshold number of frames of the first video stream.

5. The method of claim 1, wherein detecting the predefined minimum threshold rate of intraframes in the first video stream comprises detecting a predefined number of consecutive intraframes in the first video stream.

6. The method of claim 1, wherein the adjusting quality of service over the common communication link to increase the first level of quality of service provided to the first video capture device comprises:

decreasing a second level of quality of service provided to a second video capture device by a given amount, wherein the second video capture device produces a second video stream; and

correspondingly increasing the first level of quality of service provided to the first video capture device by the given amount.

7. The method of claim 6, wherein the given amount is selected from a group consisting of:

a predefined amount;

an amount in proportion to a rate of intraframes in the first video stream; and

an amount in proportion to a rate of intraframes in the second video stream.

8. The method of claim 1, wherein the adjusting quality of service over the common communication link to increase the first level of quality of service provided to the first video capture device comprises one or more of:

reallocating bandwidth of the common communication link to increase a respective amount of bandwidth allocated to the first video capture device;

increasing a level of priority provided to the first video capture device; and

adjusting capture settings of the first video capture device.

9. The method of claim 1, wherein the providing each of the plurality of video capture devices a respective level of quality of service over the common communication link comprises allocating a respective amount of bandwidth of the common communication link to each of the plurality of video capture devices, and wherein adjusting quality of service over the common communication link to increase the first level of quality of service provided to the first video capture device comprises reallocating bandwidth of the common communication link to increase a first amount of bandwidth allocated to the first video capture device.

10. The method of claim 9, wherein the reallocating bandwidth of the common communication link to increase the first amount of bandwidth allocated to the first video capture device comprises:

deallocating a given amount of bandwidth from a second video capture device; and

correspondingly allocating the given amount of bandwidth to the first video capture device.

11. The method of claim 9, wherein the reallocating bandwidth of the common communication link to increase the first amount of bandwidth allocated to the first video capture device comprises:

allocating an unallocated amount of bandwidth of the common communication link to the first video capture device.

12. The method of claim 1, further comprising:

subsequently adjusting quality of service over the common communication link to decrease the first level of quality of service provided to the first video capture device.

13. The method of claim 12, wherein the adjusting quality of service over the common communication link to decrease the first level of quality of service provided to the first video capture device comprises:

determining that the predefined minimum threshold rate of intraframes has not been detected in the first video stream during a predefined time period; and

responsively adjusting quality of service over the common communication link to decrease the first level of quality of service provided to the first video capture device.

14. The method of claim 1, further comprising:

receiving a second video stream from a second video capture device of the plurality of video capture devices over a second communication link, wherein the second video stream comprises one or more frames;

detecting the predefined minimum threshold rate of intraframes in the second video stream; and

in response to detecting the predefined minimum threshold rate of intraframes in the second video stream, adjusting quality of service over the common communication link to increase a second level of quality of service provided to the second video capture device.

15. The method of claim 1, further comprising:

receiving a second video stream from a second video capture device of the plurality of video capture devices over a second communication link, wherein the second video stream comprises one or more frames;

determining that a rate of intraframes in the second video stream exceeds a rate of intraframes in the first video stream; and

in response to determining that the rate of intraframes in the second video stream exceeds the rate of intraframes in the first video stream, adjusting quality of service over the common communication link to (i) increase a second level of quality of service provided to the second video capture device and (ii) decrease the first level of quality of service provided to the first video capture device.

16. A control unit comprising:

a first communication interface for communicating with a plurality of video capture devices;

a second communication interface for communicating with a network via a common communication link;

a processor,

data storage; and

program instructions stored in the data storage and executable by the processor to carry out functions including;

providing each of the plurality of video capture devices a respective level of quality of service over the common communication link;

receiving, via the first communication interface, a first video stream from a first video capture device of the plurality of video capture devices, wherein the first video stream comprises one or more frames;

detecting a predefined minimum threshold rate of intraframes in the first video stream;

in response to detecting the predefined minimum threshold rate of intraframes, adjusting quality of service over the common communication link to increase a first level of quality of service provided to the first video capture device; and

sending to the network over the common communication link, via the second communication interface, the first video stream with the increased first level of quality of service.

17. The control unit of claim 16, wherein the video capture devices comprise digital camcorders, and wherein the communication link comprises a wireless satellite link.

18. The control unit of claim 16, further comprising program instructions stored in the data storage and executable by the processor to carry out functions including:

adjusting quality of service over the communication link to decrease the first level of quality of service provided to the first video capture device.

19. A communication system comprising:

a plurality of video capture devices;

a network; and

a control unit,

wherein the control unit is communicatively coupled to the plurality of video capture devices via respective communication links,

wherein the control unit is communicatively coupled to the network via a common communication link, and

wherein the control unit is operable to (i) provide each of the plurality of video capture devices a respective level of quality of service over the communication link, (ii) receive a first video stream from a first video capture device of the plurality video capture devices over a first communication link, (iii) send the first video stream to the network over the common communication link according to a first level of quality of service provided to the first video capture device, (iv) detect a predefined minimum threshold rate of intraframes in the first video stream from the first video capture device, and (v) in response to detecting the predefined minimum threshold rate of intraframes in the first video stream, adjust quality of service over the common communication link to increase the first level of quality of service provided to the first video capture device.

20. The system of claim 19, wherein the control unit comprises:

a video processing device communicatively coupled to a quality of service management device,

wherein the video processing device is communicatively coupled to the plurality of video capture devices via the respective communication links,

wherein the video processing device is operable to (i) monitor the first video stream from the first video capture device, (ii) detect the predefined minimum threshold rate of intraframes in the first video stream from the first video capture device, and (iii) send to the quality of service management device an indication that the predefined minimum threshold rate of intraframes has been detected in the first video stream,

wherein quality of service management device is communicatively coupled to the plurality of video capture devices,

wherein the quality of service management device is communicatively coupled to the network via the common communication link, and

wherein the quality of service management device is operable to (i) provide each of the plurality of video capture devices the respective level of quality of service over the common communication link, (ii) receive the first video stream from the first video capture device over the first communication link, (iii) send the first video stream over the common communication link according to the first level of quality of service, (iv) receive from the video processing device the indication that the predefined minimum threshold rate of intraframes has been detected in the first video stream, and (iv) in response to receiving the indication, adjust quality of service over the common communication link to increase the first level of quality of service provided to the first video capture device.

21. The system of claim 19, wherein the plurality of video capture devices and the control unit are located remotely from the network.

22. The system of claim 19, wherein the plurality of video capture devices comprises a plurality of camera devices.