System and method for wireless communication of uncompressed video having a link control and bandwidth reservation scheme for control/management message exchanges and asynchronous traffic

• US 8,259,647 B2
• Filed: 02/27/2007
• Issued: 09/04/2012
• Est. Priority Date: 06/12/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shao, Huai-Rong, Singh, Harkirat, Ngo, Chiu
• Primary Examiner(s): MITCHELL, NATHAN A
• Application Number:
  US11/711,302
• Publication Number:
  US 20070286130A1
• Time in Patent Office: 2,016 Days
• Field of Search: 370/336, 370/338, 370/342, 370/328
• US Class Current: 370/328
• CPC Class Codes: H04N 21/43637 involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11] arrangements for wireless networking or broadcasting of information in indoor or near-field type systems H04B10/114
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

A system and method for performing medium access control in a system for wireless communication of uncompressed video is disclosed. In one aspect, the method includes communicating a control initiation request message during a contention based period of a superframe period. The control initiation request message contains information allowing a device coordinator to determine a reserved time slot for communication of the requested message exchange. The requested message exchange is then performed in a non-contentious environment, thereby limiting collisions of contention based messages. The control initiation procedure and subsequent message exchanges take place on a low-rate channel. Transmission on the low-rate channel is time division duplexed with a high-rate channel, where transmission at any one time can take place on either the high-rate or the low-rate channel.

Claims

1. A method of performing medium access control in a system for wireless communication of uncompressed video, wherein the system comprises a high rate channel and a low rate channel having a lower transmission rate than the high rate channel, the method comprising:

receiving a control initiation request message over the low rate channel from a client device during a contention based period;

determining at least one time slot to be reserved for contention-free transmission of control messages to or from the client device within a superframe period of a predetermined length in response to the control initiation request message, wherein determining at least one time slot includes determining a time slot duration, wherein the duration of each time slot is determined based on identifying a type of control message exchange sequence contained in the control initiation request message; and

transmitting a message over the low rate channel containing information identifying the at least one determined time slot,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

2. The method of claim 1, wherein frequency bands of the low rate channel and the high rate channel at least partially overlap.

3. The method of claim 1, wherein the low rate channel and the high rate channel use TDD (Time Division Duplexing).

4. The method of claim 1, wherein the control initiation request is received during a contention based control period of the superframe period.

5. The method of claim 1, further comprising transmitting a beacon message during a predetermined portion of the superframe period, wherein the beacon message contains time slot information for one or more client devices.

6. The method of claim 5, further comprising transmitting one or more control messages during the predetermined portion of the superframe period.

7. The method of claim 1, wherein the control initiation request message comprises a preamble, a header and information identifying the control messages to be communicated during the determined time slot.

8. The method of claim 7, further comprising estimating a time to complete communication of the control messages based on the identifying information contained in the control initiation request message.

9. The method of claim 1, wherein determining the at least one time slot comprises determining a first time slot for the client device to transmit control messages and determining a second time slot for the client device to receive control messages.

35. The method of claim 1, wherein the high rate channel and the low rate channel have different frequency bands.

36. The method of claim 1, wherein the type of control message exchange sequence comprises one of:

network association and disassociation, device association and disassociation, device discovery, time slot reservations, device capability, and preference exchanges.

37. The method of claim 36, wherein information identifying a requested message exchange sequence also identifies one of:

a data rate, a length of time for transmission and reception, a length of time for transmission, a length of time for reception, a minimum data rate, and a maximum data rate.

38. The method of claim 1, wherein the high-rate channel cannot be used while the low-rate channel is being used.

39. The method of claim 1, wherein determining the time slot is based on predicted time slot durations determined based on predicted data content of message exchange sequences, wherein the predicted time slot durations are stored in a look-up table.

10. A system for performing medium access control in a network for wireless communication of uncompressed video, wherein the network comprises a high rate channel and a low rate channel having a lower transmission rate than the high rate channel, the system comprising:

a receiver to receive a control initiation request message over the low rate channel from a client device during a contention based period;

a link controller to determine at least one time slot to be reserved for contention-free transmission of control messages associated with the client device within a superframe period of a predetermined length in response to the control initiation request message, wherein determining at least one time slot includes determining a time slot duration, wherein the duration of each time slot is determined based on identifying a type of control message exchange sequence contained in the control initiation request message; and

a transmitter to transmit a message over the low rate channel containing information identifying the at least one determined time slot,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

11. The system of claim 10, wherein frequency bands of the low rate channel and the high rate channel at least partially overlap.

12. The system of claim 10, wherein the low rate channel and the high rate channel use TDD (Time Division Duplexing).

13. The system of claim 10, wherein the control initiation request is received during a contention based control period of the superframe period.

14. The system of claim 10, wherein the transmitter is further configured to transmit a beacon message during a predetermined portion of the superframe period, wherein the beacon message contains time slot information for one or more client devices.

15. The system of claim 14, wherein the transmitter is further configured to transmit one or more control messages during the predetermined portion of the superframe period.

16. The system of claim 10, wherein the control initiation request message comprises a preamble, a header and information identifying the control messages to be communicated during the at least one determined time slot.

17. The system of claim 16, wherein the link controller is further configured to estimate a time to complete communication of the control messages based on the identifying information contained in the control initiation request message.

18. The system of claim 10, wherein the link controller determines a first time slot for the client device to transmit control messages and determines a second time slot for the client device to receive control messages.

19. A system for performing medium access control in a network for wireless communication of uncompressed video, wherein the network comprises a high rate channel and a low rate channel, the system comprising:

means for receiving a control initiation request message over the low rate channel from a client device during a contention based period;

means for determining at least one time slot to be reserved for contention-free transmission of control messages associated with the client device within a superframe period of a predetermined length in response to the control initiation request message, wherein determining at least one time slot includes determining a time slot duration, wherein the duration of each time slot is determined base on identifying a type of control message exchange sequence contained in the control initiation request message; and

means for transmitting a message over the low rate channel containing information identifying the at least one determined time slot,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

20. A method of performing medium access control in a system for wireless communication of uncompressed video, wherein the system comprises a high rate channel and a low rate channel having a lower transmission rate that the high rate channel, the method comprising:

transmitting a control initiation request message over the low rate channel during a contention based period;

receiving a plurality of messages over the low rate channel;

determining that one of the received messages is a response message associated with the transmitted control initiation request message, the response message containing information identifying at least one reserved time slot reserved for contention-free transmission to or from the client device within a superframe period, the superframe period being of a predetermined length;

determining a duration of each of the at least one reserved time slot based on an identified type of control message exchange sequence contained in the control initiation request message; and

transmitting and/or receiving a control message over the low rate channel during the at least one identified time slot of one or more subsequent superframe periods,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

21. The method of claim 20, wherein frequency bands of the low rate channel and the high rate channel at least partially overlap.

22. The method of claim 20, wherein the low rate channel and the high rate channel use TDD (Time Division Duplexing).

23. The method of claim 20, further comprising transmitting the control initiation request during a contention based control period of the superframe period.

24. The method of claim 20, further comprising retransmitting the control initiation request message over the low rate channel in a subsequent superframe period in response to determining that the response message has not been received.

25. The method of claim 20, wherein the control initiation request message comprises information identifying a type of control message sequence to be communicated during the at least one reserved time slot.

26. A system for performing medium access control in a network for wireless communication of uncompressed video, wherein the network comprises a high rate channel and a low rate channel having a lower transmission rate than the high rate channel, the system comprising:

a transmitter to transmit a control initiation request message over the low rate channel;

a receiver to receive a plurality of messages over the low rate channel; and

a medium access controller configured to determine that one of the received messages is a response message associated with the transmitted control initiation request message, the response message containing information identifying at least one reserved time slot within a superframe period, the superframe period being of a predetermined length, wherein the medium access controller determines the duration of the at least one time slot based on an identified type of control message exchange sequence contained in the control initiation request message;

wherein the transmitter transmits and/or the receiver receives a control message over the low rate channel during the at least one identified time slot of one or more subsequent superframe periods,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

27. The system of claim 26, wherein frequency bands of the low rate channel and the high rate channel at least partially overlap.

28. The system of claim 26 wherein the low rate channel and the high rate channel use TDD (Time Division Duplexing).

29. The system of claim 26, wherein the transmitter is further configured to transmit the control initiation request during a contention based control period of the superframe period.

30. The system of claim 26, wherein the transmitter is further configured to retransmit the control initiation request message over the low rate channel in a subsequent superframe period in response to determining that the response message has not been received.

31. The system of claim 26, wherein the control initiation request message comprises information identifying a type of control message sequence to be communicated during the at least one reserved time slot.

32. A system for performing medium access control in a network for wireless communication of uncompressed video, wherein the network comprises a high rate channel and a low rate channel having a lower transmission rate than the high rate channel, the system comprising:

means for transmitting a control initiation request message over the low rate channel during a contention based period;

means for receiving a plurality of messages over the low rate channel;

means for determining that one of the received messages is a response message associated with the transmitted control initiation request message, the response message containing information identifying at least one reserved time slot within a superframe period, the superframe period being of a predetermined length;

means for determining time slot duration based on identifying a type of control message exchange sequence contained in the control initiation request message; and

wherein the means for transmitting transmits and/or the means for receiving receives a control message over the low rate channel during the at least one identified time slot of one or more subsequent superframe periods,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

33. A system for communicating uncompressed video data over a wireless communication link, the wireless communication link including a high rate channel associated with a bandwidth capable of supporting transmission of the uncompressed video data, and a low rate channel associated with a bandwidth smaller than the bandwidth of the high rate channel, wherein frequency bands of the low rate channel and the high rate channel at least partially overlap, wherein the low rate channel has a lower transmission rate than the high rate channel, the system comprising:

a device coordinator comprising;

a receiver to receive a control initiation request message over the low rate channel during a contention based first period of a superframe period of a predetermined length,

a link controller to determine a time slot within a second portion of the superframe period to be reserved for contention-free transmission of control messages over the low rate channel in response to the control initiation request message, wherein determining at least one time slot includes determining a time slot duration, wherein the duration of each time slot is determined based on identifying a type of control message exchange sequence contained in the control initiation request message; and

a transmitter to transmit a response message over the low rate channel containing information identifying the determined time slot; and

a client device comprising;

a transmitter to transmit the control initiation request message over the low rate channel, and

a receiver to monitor the low rate channel and to receive the response message, wherein the transmitter is further configured to transmit a control message over the low rate channel during the identified time slot of one or more subsequent superframes in response to receiving the response message containing the reserved time slot information,

wherein the low rate channel provides both contention-based transmission and contention-free transmission, wherein uncompressed video is transmitted over the high rate channel rather than the low rate channel.

34. A method of performing medium access control in a system for wireless communication comprising a device coordinator and a plurality of client devices having a lower transmission rate than the high rate channel, the method comprising:

receiving a control initiation request message over the low rate channel from a client device during a contention based period;

determining at least one time slot reserved for contention-free communication by the client device based at least in part on the control initiation request message, wherein determining at least one time slot includes determining a time slot duration, wherein the duration of each time slot is determined based on identifying a type of control message exchange sequence contained in the control initiation request message;

transmitting a message over the low rate channel containing information identifying the at least one determined time slot; and

transmitting or receiving, at the client device, at least one control message over the low rate channel during the at least one determined time slot.