Fixed network master

• US 7,881,695 B2
• Filed: 01/31/2006
• Issued: 02/01/2011
• Est. Priority Date: 04/13/2005
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Iwamura, Ryuichi
• Primary Examiner(s): Appiah; Charles N
• Assistant Examiner(s): HOLLIDAY, JAIME MICHELE
• Application Number:
  US11/343,763
• Publication Number:
  US 20060233142A1
• Time in Patent Office: 1,827 Days
• Field of Search: 455/420
• US Class Current: 455/402
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An exemplary method of operation of network devices with one device operating as a master device on a communication network involves the master device broadcasting a beacon during a communication session being carried out over the network; the master device determining that the communication session being carried out over the network has ended; the master device ceasing broadcast of the beacon; the master device entering a sleeping or power saving mode; at a client device on the network, transmitting a master search message requesting services of a master device while the master device is in the sleeping or power saving mode; the master device responding to the master search message; and the master device resuming broadcasting beacon signals. This abstract is not to be considered limiting, since other embodiments may deviate from or contain a subset of the features described in this abstract.

Claims

1. A method of communication from a first power line communication (PLC) device to a second PLC device over a PLC network, comprising:

at the first PLC device, in response to detection of a user instruction to start streaming content to the second PLC device, determining if a communication synchronization beacon signal has been received from a PLC master device within a first established period of time, where the first PLC device and the PLC master device comprise at least one of an audio streaming device and a video streaming device associated with the PLC network;

if not, the first PLC device determining that a communication session being carried out over the PLC network has ended;

broadcasting, in response to determining that the communication session being carried out over the PLC network has ended, a master search message that requests services of the PLC master device, where the master search message is formatted in a same manner as the communication synchronization beacon signal; and

if an acknowledgement is received from the PLC master device within a second established period of time, obtaining communication parameters from the PLC master device to permit a streaming PLC network communication over the PLC network, and streaming the content from the first PLC device to the second PLC device using the obtained communication parameters.

2. The method according to claim 1, wherein if the acknowledgement from the PLC master device is not received within the second established period of time, the method further comprises:

determining that the first PLC device is capable of operating as a new PLC master device;

establishing the first PLC device as the new PLC master device;

generating, via the new PLC master device, communication parameters to permit the streaming PLC network communication;

transmitting the communication synchronization beacon signal from the first PLC device; and

streaming the content from the first PLC device to the second PLC device using the generated communication parameters.

3. The method according to claim 1, wherein the acknowledgement comprises the communication synchronization beacon signal.

4. The method according to claim 1, wherein the acknowledgement comprises an acknowledgement of the master search message and identification of the master device.

5. The method according to claim 1, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is transmitted using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

6. The method according to claim 1, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the acknowledgement is transmitted using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

7. The method according to claim 1, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is transmitted using the PLC network communication protocol'"'"'s communication mechanism used for communication synchronization beacon signals.

8. The method according to claim 1, wherein the master search message is transmitted using one of BPSK and QPSK modulation.

9. The method according to claim 1, wherein the master search message is retransmitted in an attempt to identify a master device.

10. The method according to claim 1, wherein the acknowledgement comprises a pre-defined master response message.

11. An electronic storage medium, carrying instructions which, when executed on a programmed processor residing in the first PLC device, cause the processor to control operation of the first PLC device in accordance with the method of claim 1.

12. A method, comprising:

determining, at a first power line communication (PLC) device in response to detection of a user instruction to stream content from the first PLC device to a second PLC device, whether a PLC master device on a PLC network has entered a power-down mode;

in response to determining that the PLC master device has entered a power-down mode;

assuming a role of the master PLC device on the PLC network;

sending communication synchronization beacon signaling to the second PLC device over the PLC network; and

streaming the content to the second PLC device concurrently with the communication synchronization beacon signaling.

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

at the PLC master device, receiving a master search message requesting services of the PLC master device while the PLC master device is in one of the sleeping mode or power saving mode; and

the PLC master device responding to the master search message.

14. The method according to claim 13, wherein the responding comprises broadcasting, via the PLC master device, the communication synchronization beacon signal.

15. The method according to claim 13, wherein the responding comprises transmitting an acknowledgement of the master search message and identification of the PLC master device.

16. The method according to claim 13, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is received using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

17. The method according to claim 13, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the responding is carried out using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

18. The method according to claim 13, wherein the streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is transmitted using the PLC network communication protocol'"'"'s communication mechanism used for communication synchronization beacon signals.

19. The method according to claim 13, wherein the master search message is received as one of BPSK and QPSK modulation.

20. The method according to claim 13, wherein the acknowledgement comprises a pre-defined master response message.

21. The method according to claim 12, further comprising:

at the PLC master device, entering an operational mode wherein the PLC master device temporarily ceases transmission of the communication synchronization beacon signals in response to a determination that a communication session being carried out between a first PLC device and a second PLC device as streaming PLC network communication over the PLC network has ended;

while in the operational mode, the PLC master device receiving a master search message requesting services of the PLC master device, where the master search message is formatted in a same manner as the communication synchronization beacon signals and is sent from the second PLC device in response to detection of a user instruction received by the second PLC device to start a new streaming PLC communication over the PLC network; and

the PLC master device responding to the master search message.

22. The method according to claim 21, wherein the operational mode comprises at least one of a sleeping mode or a power saving mode.

23. The method according to claim 21, wherein the responding comprises broadcasting a communication synchronization beacon signal.

24. The method according to claim 21, wherein the responding comprises transmitting an acknowledgement of the master search message and identification of the PLC master device.

25. The method according to claim 21, wherein the new streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is received using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

26. The method according to claim 21, wherein the new streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the responding is carried out using the PLC network communication protocol'"'"'s highest reliability communication mechanism.

27. The method according to claim 21, wherein the new streaming PLC network communication is carried out using a plurality of communication mechanisms defined in a PLC network communication protocol, and wherein the master search message is transmitted using the PLC network communication protocol'"'"'s communication mechanism used for communication synchronization beacon signals.

28. The method according to claim 21, wherein the master search message is received as one of BPSK and QPSK modulation.

29. An electronic storage medium, carrying instructions which, when executed on a programmed processor residing in the PLC master device, cause the processor to control operation of the PLC master device in accordance with the method of claim 21.

30. The method according to claim 21, wherein the responding to the master search message comprises transmitting a pre-defined master response message.

31. An electronic storage medium, carrying instructions which, when executed on a programmed processor residing in the PLC master device, cause the processor to control operation of the PLC master device in accordance with the method of claim 13.

32. An electronic storage medium, carrying instructions which, when executed on a programmed processor residing in the PLC master device, cause the processor to control operation of the PLC master device in accordance with the method of claim 12.