SYSTEM AND METHOD FOR COMPENSATING FOR DELAY AND JITTER

• US 20150237099A1
• Filed: 02/14/2014
• Published: 08/20/2015
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: BAI, FAN, YU, BO, HRABAK, ROBERT A., THANAYANKIZIL, LAKSHMI V., POP, DAVID P.
• Granted Patent: US 9,246,970 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/00 Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
• CPC Class Codes: H04L 2012/5646 Cell characteristics, e.g. loss, delay, jitter, sequence integrity
• CPC Class Codes: H04L 2012/5649 Cell delay or jitter
• CPC Class Codes: H04L 47/283 in response to processing delays, e.g. caused by jitter or round trip time [RTT]
• CPC Class Codes: H04L 65/1094 Inter-user-equipment sessions transfer or sharing
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor

Abstract

Methods and systems for compensating for delay or jitter are provided. The methods, for example, may include, but are not limited to receiving, by a processor, one or more data streams from one or more electronic devices, transmitting, by the processor, the one or more data streams to one or more displays, determining, by the processor, delay and jitter in the one or more data streams transmitted by the processor, and requesting, by the processor, at least one of the one or more electronic devices to adjust a respective data stream via a communication system.

Claims

1. A vehicle, comprising:

a communication system;

a master display unit communicatively connected to the communication system, the master display unit, comprising;

a processor, and

a first display; and

a second display communicatively connected to the master display unit via the communication system,

wherein the processor is further configured to;

receive one or more data streams from one or more electronic devices via the communication system,

transmit the one or more data streams to one or more of the first display and the second display,

determine delay and jitter in the one or more data streams transmitted to the one or more of the first display and the second display, and

transmit, via the communication system, a request to at least one of the one or more electronic devices to adjust a respective data stream based upon the determined delay and jitter.

2. The vehicle of claim 1, wherein the master display unit further comprises a buffer, and the processor is further configured to:

determine if the at least one of the one or more electronic devices adjusted the data stream based upon the request; and

when the at least one of the one or more electronic devices did not adjust the data stream based upon the request, the processor is further configured to adjust a size of the buffer based upon the determined delay and jitter.

3. The vehicle of claim 2, wherein the processor is further configured to:

determine if one of the one or more data streams is from a delay sensitive application or a jitter sensitive application; and

adjust the size of the buffer for the one of the one or more data streams based upon the determination if the one of the one or more data streams is from the delay sensitive application or the jitter sensitive application.

4. The vehicle of claim 3, wherein the processor is further configured to adjust the size of the buffer according to:

5. The vehicle of claim 3, wherein the processor is further configured to determine the delay according to:

{tilde over (τ

)}(t)=α

·

(t−

1)+(1−

α

)·

d(t)

where α

is a variable delay factor (0<

α

<

1), d (t) is the delay measured at time t, and {tilde over (τ

)}(t) is the moving average delay at time t.

6. The vehicle of claim 3, wherein the processor is further configured to determine the jitter according to:

{tilde over (τ

)}(t)=α

·

{tilde over (σ

)}(t−

1)+(1−

α

)−

d(t))

where (α

is a variable delay factor (0<

α

<

1), d (t) is the delay measured at time t, {tilde over (τ

)}(t) is the moving average delay at time t, and {tilde over (σ

)}(t) is the moving average jitter at time t.

7. The vehicle of claim 1, wherein the transmitted request includes a request to adjust one or more of a compression ratio, a frame rate and a display resolution.

8. The vehicle of claim 1, wherein the communication system is a Miracast communication system.

9. A method for compensating for delay or jitter by a processor in a vehicle, the method comprising:

receiving, by the processor, one or more data streams from one or more electronic devices;

transmitting, by the processor, the one or more data streams to one or more displays in the vehicle;

determining, by the processor, delay and jitter in the one or more data streams transmitted by the processor; and

requesting, by the processor, at least one of the one or more electronic devices to adjust a respective data stream via a communication system.

10. The method according to claim 9, further comprising:

determining, by the processor, if the at least one of the one or more electronic devices adjusted the respective data stream; and

adjusting, by the processor, a size of a buffer for at least one of the one or more data streams based upon the determined delay and jitter when the processor determines that the at least one of the one or more electronic devices did not adjust the respective data stream.

11. The method according to claim 10, further comprising:

determining, by the processor, if one of the one or more data streams is from a delay sensitive application or a jitter sensitive application; and

adjusting, by the processor, the size of the buffer for at least one of the one or more data streams based upon the determination if the one of the one or more data streams is from the delay sensitive application or the jitter sensitive application.

12. The method according to claim 10, further comprising adjusting the size of the buffer according to:

13. The method according to claim 12, further comprising determining the delay according to:

{tilde over (σ

)}(t)=α

·

{tilde over (σ

)}(t−

1)+(1−

α

)·

({tilde over (τ

)}(t)−

d(t)

where α

is a variable delay factor (0<

α

<

1), d(t) is the delay measured at time t, and {tilde over (τ

)}(t) is the moving average delay at time t.

14. The method according to claim 12, further comprising determining the jitter according to:

{tilde over (σ

)}(t)=α

·

{tilde over (σ

)}(t−

1)+(1−

α

)·

({tilde over (τ

)}−

d(t))

where α

is a variable delay factor (0<

α

<

1), d(t) is the delay measured at time t, {tilde over (τ

)}(t) is the moving average delay at time t, and {tilde over (σ

)}(t) is the moving average jitter at time t.

15. The method according to claim 9, wherein the transmitted request includes a request to adjust one or more of a compression ratio, a frame rate and a display resolution.

16. A system for compensating for delay or jitter by a processor in a vehicle, comprising:

a communication system;

a master display unit communicatively connected to the communication system, the master display unit, comprising;

the processor, and

a first display; and

a second display communicatively connected to the master display unit via the communication system,

wherein the processor is further configured to;

receive one or more data streams from one or more electronic devices via the communication system,

transmit the one or more data streams to one or more of the first display and the second display,

determine delay and jitter in the one or more data streams transmitted to the one or more of the first display and the second display,

transmit, via the communication system, a request to at least one of the one or more electronic devices to adjust a respective data stream based upon the determined delay and jitter,

determine if the at least one of the one or more electronic devices adjusted the data stream based upon the request, and

when the at least one of the one or more electronic devices did not adjust the data stream based upon the request, the processor is further configured to adjust a size of a buffer based upon the determined delay and jitter.

17. The system of claim 16, wherein the processor is further configured to:

determine if one of the one or more data streams is from a delay sensitive application or a jitter sensitive application; and

adjust the size of the buffer for the one of the one or more data streams based upon the determination if the one of the one or more data streams is from the delay sensitive application or the jitter sensitive application.

18. The system of claim 17, wherein the processor is further configured to adjust the size of the buffer according to:

19. The system of claim 18, wherein the processor is further configured to determine the delay according to:

{tilde over (τ

)}=α

·

{tilde over (τ

)}(t−

1)+(1−

α

)·

d(t)

where α

is a variable delay factor (0<

α

<

1), d (t) is the delay measured at time t, and {tilde over (τ

)}(t) is the moving average delay at time t.

20. The system of claim 18, wherein the processor is further configured to determine the jitter according to:

{tilde over (σ

)}(t)=α

·

{tilde over (σ

)}(t−

1)+(1−

α

)·

({tilde over (τ

)}(t)−

d(t))

where α

is a variable delay factor (0<

α

<

1), d(t) is the delay measured at time t, {tilde over (τ

)}(t) is the moving average delay at time t, and {tilde over (σ

)}(t) is the moving average jitter at time t.