Non-Beacon Network Communications Using Frequency Subbands

• US 20120275326A1
• Filed: 04/27/2012
• Published: 11/01/2012
• Est. Priority Date: 04/28/2011
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Vedantham, Ramanuja, Vijayasankar, Kumaran, Dabak, Anand G., Varadarajan, Badri N.
• Granted Patent: US 8,885,505 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 3/544 Setting up communications; Call and signalling arrangements
• CPC Class Codes: H04L 41/0833 for reduction of network energy consumption
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: Y04S 40/00 Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them

Abstract

Systems and methods for designing, using, and/or implementing non-beacon network communications using frequency subbands are described. In various implementations, these systems and methods may be applicable to Power Line Communications (PLC). For example, a method may include transmitting a beacon request message over a given one of a plurality of frequency subbands, receiving a plurality of beacons in response to having transmitted the beacon request message, each of the plurality of beacons received over a respective one of the plurality of frequency subbands, and calculating a downlink quality report based, at least in part, upon the received beacons. The method may also include transmitting the downlink quality report over each of the plurality of frequency subbands and receiving a subband allocation command in response to having transmitted the downlink quality report, the subband allocation command indicating a downlink subband assignment and an uplink subband assignment.

Claims

1. A method comprising:

performing, using a communication device,

transmitting a beacon request message over a given one of a plurality of frequency subbands;

receiving a plurality of beacons in response to having transmitted the beacon request message, each of the plurality of beacons received over a respective one of the plurality of frequency subbands;

calculating a downlink quality report based, at least in part, upon the received beacons;

transmitting the downlink quality report over each of the plurality of frequency subbands; and

receiving a subband allocation command in response to having transmitted the downlink quality report, the subband allocation command indicating a downlink subband assignment and an uplink subband assignment.

2. The method of claim 1, wherein the beacon request message indicates a sequence of frequency subbands over which the plurality of beacons is transmitted by other devices that are part of a network.

3. The method of claim 1, wherein the beacon request message indicates a sequence of frequency subbands over which the downlink quality report is transmitted.

4. The method of claim 1, wherein the downlink quality report includes a downlink channel quality indicator for each of the plurality of subbands, the downlink channel quality indicator usable by other devices to estimate an uplink quality in each of the plurality of subbands.

5. The method of claim 1, wherein the downlink quality report indicates a downlink subband chosen by the communication device among the plurality of plurality of subbands.

6. The method of claim 5, wherein receiving the subband allocation command includes receiving the allocation command over the chosen downlink subband, the subband allocation command identifying uplink subbands chosen by other devices.

7. The method of claim 6, wherein the allocated downlink subband assignment identifies an assigned downlink subband that is the same as the chosen downlink subband.

8. The method of claim 6, wherein the allocated downlink subband assignment identifies an assigned downlink subband different from the chosen downlink subband.

9. The method of claim 1, further comprising:

performing, using the communication device,

communicating with another PLC device using the downlink subband assignment and the uplink subband assignment.

10. The method of claim 9, wherein the communication device is a Power Line Communication (PLC) device coupled to a low-voltage (LV) power line, and wherein the other device is a PLC data concentrator coupled to a medium-voltage (MV) power line.

11. A Power Line Communication (PLC) device, comprising:

a processor; and

a memory coupled to the processor, the memory configured to store program instructions executable by the processor to cause the PLC device to;

transmit, to a PLC data concentrator, a beacon request message over a given one of a plurality of frequency subbands;

receive a plurality of beacons from the PLC data concentrator in response to having transmitted the beacon request message, each of the plurality of beacons received over a respective one of the plurality of frequency subbands;

calculate a downlink quality report based, at least in part, upon the received beacons; and

transmit an uplink scan initiation request to the PLC data concentrator over the given one of the plurality of frequency subbands, the uplink scan initiation request indicating a chosen one of the plurality of frequency subbands.

12. The PLC device of claim 11, wherein the processor includes a digital signal processor (DSP), an application specific integrated circuit (ASIC), a system-on-chip (SoC) circuit, a field-programmable gate array (FPGA), a microprocessor, or a microcontroller.

13. The PLC device of claim 11, the program instructions further executable by the processor to cause the PLC device to:

receive an uplink scan initiation command from the PLC data concentrator in response to the uplink scan initiation request over the chosen one of the plurality of frequency subbands, the uplink scan initiation request indicating a downlink subband assignment to be used in subsequent communications;

transmit the downlink quality report to the PLC data concentrator over each of the plurality of frequency subbands in response to the uplink scan initiation command; and

receive a subband allocation command from the PLC data concentrator in response to having transmitted the downlink quality report, the subband allocation command received over the downlink subband assignment, the subband allocation command indicating an uplink subband assignment to be used in subsequent communications.

14. The PLC device of claim 13, wherein the downlink subband assignment is different from the chosen one of the plurality of frequency subbands.

15. The PLC device of claim 13, wherein the program instructions, upon execution, further cause the PLC device to:

communicate with the PLC data concentrator using the downlink subband assignment and the uplink subband assignment.

16. The PLC device of claim 11, the program instructions further executable by the processor to cause the PLC device to:

in response to not receiving an uplink scan initiation command from the PLC data concentrator, transmit another beacon request message to the PLC data concentrator over each of the plurality of subbands, the PLC data concentrator configured to select an uplink subband based, at least in part, upon the other beacon requests.

17. A non-transitory electronic storage medium having program instructions stored thereon that, upon execution by a processor within a Power Line Communication (PLC) data concentrator, cause the PLC data concentrator to:

receive, from a PLC device, a beacon request message over a given one of a plurality of frequency subbands;

transmit a plurality of beacons to the PLC device, each of the plurality of beacons transmitted over a respective one of the plurality of frequency subbands;

receive a downlink quality report from the PLC device over each of the plurality of frequency subbands; and

transmit a subband allocation command to the PLC device, the subband allocation command indicating an uplink subband assignment to be used in subsequent communications with the PLC device.

18. The non-transitory electronic storage medium of claim 17, wherein the program instructions, upon execution, further cause the PLC data concentrator to:

receive an uplink scan initiation request from the PLC device over the given one of the plurality of frequency subbands prior to having received the downlink quality report, the uplink scan initiation request indicating a chosen one of the plurality of frequency subbands suitable for subsequent downlink communications; and

transmit an uplink scan initiation command to the PLC device in response to the uplink scan initiation request over the chosen one of the plurality of frequency subbands, the uplink scan initiation request indicating a downlink subband assignment to be used in subsequent communications.

19. The non-transitory electronic storage medium of claim 18, wherein the downlink subband assignment is different from the chosen one of the plurality of frequency subbands.

20. The non-transitory electronic storage medium of claim 19, wherein the program instructions, upon execution, further cause the PLC data concentrator to:

communicate with PLC device using the downlink subband assignment and the uplink subband assignment.