Method of band multiplexing to improve system capacity for a multi-band communication system

• US 7,454,218 B2
• Filed: 08/19/2005
• Issued: 11/18/2008
• Est. Priority Date: 08/19/2005
• Status: Active Grant

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Gelman, Alexander D., Mo, Shaomin Samuel
• Primary Examiner(s): Anderson; Matthew
• Assistant Examiner(s): Nguyen; Hai V
• Application Number:
  US11/207,520
• Publication Number:
  US 20070054680A1
• Time in Patent Office: 1,187 Days
• Field of Search: 455/502
• US Class Current: 455/502
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/71635 Transmitter aspects H04B1/7174 takes precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04J 3/0638 Clock or time synchronisation among nodes; Internode synchronisation synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time

Abstract

A control method of synchronizing communications between or among a plurality of devices in a communication system includes detecting beacons from the plurality of devices in the communication system, and establishing a reservation for at least a portion of the plurality of devices in the communication system. Each reservation is a frame interval in which to transmit symbols from one device to one or more of the other devices in the communications system. Each frame interval and intra-frame interval is set according to the established reservation. Each frame interval and intra-frame interval is a plural, integral number of symbol periods in duration.

Claims

1. A control method for synchronizing communications between or among a plurality of devices in a communication system;

the method comprising the steps of;

a) detecting beacons from the plurality of devices in the communication system;

b) establishing a reservation for at least a portion of the plurality of devices in the communication system, each reservation being a frame interval in which to transmit symbols from one device to one or more other devices in the communications system; and

c) setting each frame interval and a corresponding intra-frame interval according to the established reservation, each frame interval and each intra-frame interval being a plural, integral number of symbol periods in duration.

2. The control method of claim 1, wherein each frame interval includes N symbol periods and each intra-frame interval includes M symbol periods, where N and M are integers and are not equal.

3. The control method of claim 1, further comprising the steps of:

d) determining, by each device, a time-frequency code for each of the other devices in the communication system according to the detected beacons from the other devices; and

e) during a frame interval, transmitting symbols for a communication from a respective device over a plurality of frequency bands according to the determined time-frequency codes.

4. The control method of claim 3, wherein step (d) of determining the time-frequency code for each of the devices in the communication system includes the step of:

setting each of the devices to respond with a beacon to transmit symbols according to a channel of the time-frequency code.

5. The control method of claim 4, wherein step (e) of transmitting symbols includes the steps of:

adjusting the transmission frequency according to the time-frequency code;

transmitting one or more successive symbols in the frame at the adjusted transmission frequency; and

repeating the adjusting and transmitting steps until the communication from the respective device is completed.

6. The control method of claim 1, further comprising the step of:

d) offsetting a start of a frame for at least one device with respect to one or more other devices according to the detected beacons.

7. The control method of claim 1, further comprising the steps of:

transmitting a symbol for each respective device on a corresponding frequency band;

adjusting the transmission frequency of each device to a next corresponding frequency band and further transmitting another respective symbol for each respective device on the next corresponding frequency band; and

repeating the adjusting and further transmitting step until communication from each device is completed.

8. The control method of claim 7, wherein the repeated adjusting of the transmission frequency of each device to each next corresponding frequency band is coordinated between or among the plurality of devices based on predefined time-frequency codes.

9. The control method of claim 8, wherein the coordination of transmission of the plurality of devices includes:

establishing a logical succession of the plurality of frequency bands; and

adjusting the transmission frequency band of each device by following the established logical succession.

10. The control method of claim 9, wherein the adjustment of the transmission frequency of each device by following the logical succession established comprises:

adjusting the transmission frequency band of each device to either (1) the next higher frequency band, where the lowest frequency band is defined as logically the next higher frequency band for the highest frequency band or (2) the next lower frequency, where the highest frequency band is defined as logically the next lower frequency band for the lowest frequency band.

11. The control method of claim 9, wherein the transmission frequency of each device does not repeat until all of the plurality of frequency bands have been transmitted by each device.

12. The control method of claim 7, wherein the plurality of devices is less than the plurality of frequency bands in number.

13. The control method of claim 1, further comprising the steps of:

determining timing of beacons of respective devices;

establishing the frame interval for transmitting one or more symbols for a first device by responding with a beacon in accordance with a determined timing of the beacons from other devices; and

synchronizing a start of the respective frame intervals for each successive device responding with a corresponding beacon according to the established frame interval.

14. The control method of claim 13, further comprising the step of positioning the start of the respective frame interval for successive devices responding with the beacon based on a predefined symbol duration.

15. The control method of claim 1, wherein step (c) of setting each frame interval and each intra-frame interval includes establishing each frame and intra-frame duration to be an integral number of time-frequency code intervals.

16. The control method of claim 1, wherein the infra-frame intervals include either (1) intervals between frames or (2) intervals between frames and guard intervals at an end of a reservation by a respective device.

17. The control method of claim 1, wherein step (e) of transmitting symbols includes OFDM transmitting of symbols.

18. A method of controlling synchronization of a plurality of devices during a plurality of frames of a superframe in a communication system;

the method comprising the steps of;

a) detecting, by each device, beacons from the plurality of other devices in the communication system;

b) setting each frame interval and each intra-frame interval of the superframe to be a plural, integral number of symbol periods in duration; and

c) aligning a start of each of the frame intervals of the superframe according to the detected beacons.

19. A control method of band multiplexing communications from the plurality of devices in the communication system, the method comprising the steps of:

synchronizing frame intervals among the plurality of devices, frame interval being intervals in which symbol data is transmitted, by setting each frame interval and each intra-frame interval to be a plural, integral number of symbol periods in duration;

rotating, by each device, between or among a plurality of frequency bands; and

transmitting one or more symbols from each device at each of the rotated transmission frequencies such that simultaneous transmissions by respective devices are at different transmission frequencies.

20. A computer readable storage medium including software that is configured to control a general purpose computer to implement a method embodied in a computer readable medium to control communication from a device in the communication system, the method comprising the steps of:

a) detecting beacons from a plurality of other devices in the communication system;

b) establishing a reservation for the device, the reservation being a frame interval in which to transmit symbols from the device to one or more other devices in the communications system; and

c) setting each frame interval and a corresponding intra-frame interval according to the established reservation, each frame interval and each intra-frame interval being a plural, integral number of symbol periods in duration.