Method and system for device discovery in a wireless video area network

• US 8,700,064 B2
• Filed: 06/18/2012
• Issued: 04/15/2014
• Est. Priority Date: 05/18/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shao, Huai-Rong, Singh, Harkirat, Ngo, Chiu
• Primary Examiner(s): MATHARU, MANPREET S
• Application Number:
  US13/526,425
• Publication Number:
  US 20120263069A1
• Time in Patent Office: 666 Days
• Field of Search: 455/456.2, 455/404.2, 4554561-457
• US Class Current: 455/456.2
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

A method and system for device discovery in a wireless network is provided. The device discovery involves directionally transmitting a data unit from a transmitting station over a channel in different directions to emulate omni-directional transmission, receiving the data unit transmissions from different directions at a receiving station, determining the quality of the transmissions received from the different directions, and detecting location information for the transmitting station relative to the receiving station based on the highest quality transmission among the transmissions received from the different directions. Further, if a channel has sufficient bandwidth to satisfy direct link communication between two stations, then during a direct link set-up stage, the two stations conduct a probing message exchange using omni-direction transmission, and upon successful probing, obtain communication link status information and set proper communication configurations for the two stations based on the communication link status information.

Claims

1. A method for device discovery in a wireless network, comprising:

receiving data unit transmissions from different directions at a receiving station from a transmitting station;

detecting location information for the transmitting station relative to the receiving station based on a highest quality transmission among the transmissions received from the different directions, wherein the location information comprises a location vector including N elements corresponding to directional transmissions of a data unit in N different directions, wherein each vector element describes the signal quality of the transmission along a corresponding one of the N directions,

wherein the receiving station measures and compares signal quality for copies of a beacon received in different directions, for determining a new location vector and determines a distance between the new location vector and an existing location vector.

2. The method of claim 1, further comprising:

coordinator station transmitting the copies of the beacon, wherein N copies of the beacon are directionally transmitted in N different directions.

3. The method of claim 2, wherein the coordinator station periodically transmitting the beacon in omni-directional emulation mode.

4. The method of claim 3, further comprising:

if the distance is larger than a pre-defined threshold, then the receiving station transmitting a location updating control frame to the coordinator station; and

the coordinator station updating the location information for the receiving station maintained by the coordinator.

5. The method of claim 4 wherein directionally transmitting comprises transmitting a data unit in different directions by beam-steering transmission of the data unit in said different directions.

6. The method of claim 1, wherein detecting location information further includes determining the direction of a transmitting station relative to the receiving station, as location information.

7. The method of claim 2, further comprising:

the coordinator station maintaining location information for associated stations in the network relative to the coordinator station;

the coordinator station periodically transmitting said location information in a beacon; and

an associated receiving station using a reduced PHY preamble and reduced payload in a frame transmission to the coordinator station based on the corresponding location information.

8. A system for device discovery in a wireless network, comprising:

a coordinator station configured for transmitting N copies of a beacon in N different directions to a receiving station, wherein the coordinator station determines quality of transmissions received from different directions, and detects location information for a transmitting station relative to the receiving station which receives transmissions from the transmitting station, based on a highest quality transmission among the transmissions received from the different directions, wherein the location information comprises a location vector including N elements corresponding to directional transmissions of a data unit in N different directions, wherein each vector element describes the signal quality of the transmission along a corresponding one of the N directions; and

a management entity of the receiving station that measures and compares signal quality for copies of the beacon received in different directions, and determines a new location vector,

wherein the receiving station determines a distance between the new location vector and an existing location vector.

9. The system of claim 8, further comprising:

a communication module that directionally transmits a data unit from the transmitting station over a channel in different directions to emulate omni-directional transmission,

wherein the management entity receives the data unit transmissions from different directions at the receiving station.

10. The system of claim 9, wherein the coordinator station periodically transmits a beacon in omni-directional emulation mode.

11. The system of claim 10, wherein the management entity detects location information by determining the direction of the transmitting station relative to the receiving station, as location information.

12. The system of claim 10 wherein the data unit comprises a frame.

13. The system of claim 11 wherein:

the receiving station is configured such that, if the difference between new location information and the previous measured location information is larger than a pre-defined threshold, then the receiving station transmits a location updating control frame to the coordinator station; and

the coordinator station is further configured to updating the location information for the receiving station maintained by the coordinator station.

14. A method for device discovery in a wireless network, comprising:

receiving data unit transmissions from different directions transmitted by a transmitting station at a receiving station;

determining quality of the transmissions received from the different directions by the receiving station;

detecting location information based on a highest quality transmission among the transmissions received from the different directions, wherein the location information comprises a location vector including N elements corresponding to directional retransmissions of a data unit in N different directions, wherein each vector element describes the signal quality of received directional retransmission along a corresponding one of the N direction; and

measuring and comparing, by the receiving station, the signal quality for copies of a beacon received in different directions, to determine a new location vector, wherein the receiving station determines a distance between the new location vector and an existing location vector.

15. The method of claim 14, further comprising:

directionally transmitting a data unit from a transmitting station over a channel in different directions to emulate omni-directional transmission.

16. The method of claim 15, wherein detecting location information comprises detecting the location information for the transmitting station relative to the receiving station.

17. The method of claim 16, further comprising:

a coordinator station transmitting the beacon, wherein N copies of the beacon are directionally transmitted in N different directions.

18. The method of claim 17, wherein the coordinator station comprises a sink of one of video data, audio data, and video and audio data.

19. The method of claim 17, wherein the coordinator station provides channel coordination functions for wireless communication between a sink station and a source station.

20. The method of claim 17, wherein the coordinator station uses a high rate channel and a low rate channel for communicating video information with the receiving station and transmitting station, wherein the high rate channel only supports single direction unicast transmission for support of uncompressed high definition (HD) video data, and the low rate channel supports bi-directional transmission.

21. A method for device discovery in a wireless network, comprising:

directionally transmitting a data unit from a transmitting station over a channel in different directions to emulate omni-directional transmission;

determining quality of the transmissions transmitted in the different directions by a receiving station;

detecting location information based on a highest quality transmission among the transmissions transmitted in the different directions by the receiving station, wherein the location information comprises a location vector including N elements corresponding to directional retransmissions of a data unit in N different directions, wherein each vector element describes the signal quality of transmitted directional retransmission along a corresponding one of the N directions; and

measuring and comparing, by the receiving station, the signal quality for copies of a beacon received in different directions, to determine a new location vector, wherein the receiving station determines a distance between the new location vector and an existing location vector.

22. A method for device discovery in a wireless network, comprising:

directionally transmitting a data unit from a transmitting station over a channel in different directions to emulate omni-directional transmission to a receiving station;

detecting location information, by the receiving station, based on a highest quality transmission among the transmissions transmitted in the different directions, wherein the location information comprises a location vector including N elements corresponding to directional transmissions of a data unit in N different directions, wherein each vector element describes the signal quality of the transmission along a corresponding one of the N directions; and

measuring and comparing, by the receiving station, the signal quality for copies of a beacon received in different directions, to determine a new location vector, wherein the receiving station determines a distance between the new location vector and an existing location vector.