Method and Apparatus of Using Separate Reverse Channel for User Input in Mobile Device Display Replication

• US 20140201259A1
• Filed: 01/15/2013
• Published: 07/17/2014
• Est. Priority Date: 01/15/2013
• 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, Hrabak, Robert A., Pop, David P., Yu, Bo
• Granted Patent: US 9,237,197 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
• CPC Class Codes: H04L 67/75 Indicating network or usage conditions on the user display

Abstract

A method of controlling media content between a portable device and a head control unit. A first link is initiated for transmitting control signals between a control client and a control server. A second link is initiated for transmitting media content between a data server and a data client. The first link has a lower traffic volume capacity than the second link and a shorter latency for the control signals than for the media content signal over the second link. The control client generates control signals identifying a user'"'"'s request and transmits the control signals to the control server using the first link. The control server provides instructions to the data server for executing the user request. The retrieved media data is transmitted from the data server to the data client using the second link. The media data is output to the user over the media output device.

Claims

1. A method of controlling media content between a source and a remote output device, the method comprising the steps of:

providing an autonomous portable multimedia device adapted to relay media content, the portable device including a control server, a data server, and a content cache;

providing a head control unit for fixed operation at a viewer seating location including a control client and a data client, the head control unit including a media output device for playback of the relayed media content, the head control unit being remote from the portable device;

initiating a first local network link between the control client and the control server for transmitting control signals between the head control unit and the portable device;

initiating a second local network link between the data server and the data client for transmitting media content signals between the portable device and the head control unit, wherein the first local network link has a lower traffic volume capacity than the second local network link and a shorter latency for the control signals than for the media content signal over the second local network link;

receiving user input data at a head control unit, the user input data relating to a user'"'"'s request for altering playback of the relayed media content;

the control client generating the control signals identifying the user'"'"'s request and transmitting them to the control server using the first local network link;

the control server providing instructions to the data server for executing the user request;

synching the data server with the content cache for retrieving media data used to carry out the instructions;

transmitting the retrieved media data from the data server to the data client using the second local network link; and

outputting the media data to the user over the media output device.

2. The method of claim 1 wherein the first and second local network links comprise separate transport entities.

3. The method of claim 1 wherein the first and second local network links comprise separate virtual channels on a same transport entity with different priorities.

4. The method of claim 1 wherein the data client includes a real-time transport protocol, the real-time transport protocol receiving the media data over a respective communication channel using the selected communication scheme.

5. The method of claim 4 wherein the control client includes a real time streaming protocol, the real time streaming protocol to control media transmission sessions between the portable device and the head control unit using the selected communication scheme.

6. The method of claim 5 wherein the control client includes a remote desktop client providing graphical interface to the head control unit using the selected communication scheme.

7. The method of claim 6 wherein the data server includes a real-time transport protocol server, the real-time transport protocol server delivering the media data over a respective communication channel using the selected communication scheme.

8. The method of claim 7 wherein the control server includes a real-time streaming protocol server, the real-time streaming protocol server controlling media transmission sessions between the portable device and the head control unit using the selected communication scheme.

9. The method of claim 8 wherein the control server includes a remote desktop client providing graphical interface to the portable device using the selected communication scheme.

10. The method of claim 9 wherein the head control unit and the portable device each include a time synch module for generating time stamps and synchronizing communications between the control client and control server, and for generating time stamps and synchronizing communications between the data client and data server.

11. The method of claim 10 wherein the remote desktop client and real-time streaming protocol client pauses the real time transport protocol client and retrieves meta information from the real-time transport protocol client, wherein the meta information includes current status operation of the real time protocol client and a timestamp for synchronization.

12. The method of claim 11 wherein the remote desktop client and real-time streaming protocol client communicates the control action request using the selected communication scheme and instructs the remote desktop server and real-time stream protocol server of the desired operation as requested by the user.

13. The method of claim 12 wherein the remote desktop server and the real-time streaming protocol server provides the real-time protocol server the desired operation, timestamp information, and status information.

14. The method of claim 13 wherein the real-time protocol server communicates with the content cache for identifying the respective media data affected by the user request.

15. The method of claim 14 wherein the content cache streams the respective media data affected by the user request to the real-time protocol server.

16. The method of claim 15 wherein the real-time protocol server transmits the respective media data to the real-time protocol client over the respective channel using the selected communication scheme.

17. The method of claim 16 wherein using a first communication scheme using two one-way communication channels includes transmitting the media data from the real-time protocol server to the real-time protocol client over a first communication channel, the first communication channel being a wireless communication channel, and transmitting control signals from remote desktop client and real-time stream protocol client to the remote desktop server and real-time stream server using a second communication channel that is separate from the first communication channel.

18. The method of claim 17 wherein the second communication channel includes a wireless communication channel.

19. The method of claim 18 wherein the second communication channel includes a wireline communication channel.

20. The method of claim 19 wherein using a second communication scheme using prioritized communication on a same communication channel includes prioritizing communications between control signal and data signals.

21. The method of claim 20 wherein messages containing control signals are provided a higher prioritization relative to messages containing media data.

22. The method of claim 21 wherein prioritization over the same communication channel is executed utilizing Enhanced Distributed Channel Access of a wireless communication mechanism.

23. The method of claim 21 wherein prioritization over the same communication channel is executed utilizing an upper layer protocol component.

24. The method of claim 23 wherein the upper layer protocol component includes enhanced transmission control protocol variants.