System and method for wireless communication in a time division duplexing region

• US 7,965,661 B2
• Filed: 01/04/2008
• Issued: 06/21/2011
• Est. Priority Date: 09/14/2000
• Status: Active Grant

• Current Assignee: Zarbana Digital Fund LLC (Intellectual Ventures LLC)
• Original Assignee: Harington Valve LLC (Intellectual Ventures LLC)
• Inventors: Klein, Israel Jay, Stanwood, Kenneth L.
• Primary Examiner(s): LEE, CHI HO A
• Application Number:
  US11/969,770
• Publication Number:
  US 20080107049A1
• Time in Patent Office: 1,264 Days
• Field of Search: 370/275, 370/276, 370/319, 370/344
• US Class Current: 370/275
• CPC Class Codes: H04B 7/2621 using frequency division multiple access [FDMA] H04B7/2615 takes precedence
• CPC Class Codes: H04B 7/2656 for structure of frame, burst
• CPC Class Codes: H04B 7/2687 Inter base stations synchronisation

Abstract

A method and system for using half-duplex base stations and half-duplex nodes in a Frequency Division Duplexing region to provide wireless connectivity between the half-duplex base stations and customers in multiple sectors of a cell. The method and system can use two physical channels to form two logical channels. Each logical channel shares both physical channels during alternating frames of time. The half-duplex nodes can include a millimeter-wave band frequency synthesizer configured to transmit and receive on different channels to and from the half-duplex base station. Re-use patterns of the physical channels are used for deployment of half-duplex base stations and half-duplex nodes in the FDD region to minimize co-channel interference and interference due to uncorrelated rain fade. Additional methods and systems utilize full-duplex base stations and smart antenna to communicate with the half-duplex nodes.

Claims

1. A time division duplexing wireless communication system, comprising:

a first half-duplex modem/outdoor unit in a first sector and a second half-duplex modem/outdoor unit in a second sector, both configured to alternate in transmission of modulated data over a first channel and reception of modulated data over a second channel; and

a full-duplex modem/outdoor unit configured to alternate between;

simultaneous transmission of modulated data to the first half-duplex modem/outdoor unit in the first sector over the second channel and reception of modulated data from the second half-duplex modem/outdoor unit in the second sector over the first channel, and

simultaneous transmission of modulated data to the second half-duplex modem/outdoor unit in the second sector over the second channel and reception of modulated data from the first half-duplex modem/outdoor unit in the first sector over the first channel;

wherein the full-duplex modem/outdoor unit is further configured to transmit odd frames of data to the first half-duplex modem/outdoor unit and even frames of data to the second half-duplex modem/outdoor unit both on the second channel, and configured to receive even frames of data from the first half-duplex modem/outdoor unit and odd frames of data from the second half-duplex modem/outdoor unit both on the first channel.

2. The system of claim 1, further comprising a frequency synthesizer in each of the half-duplex modem/outdoor units and configured to offset the modulated data transmitted on the first channel from the modulated data received on the second channel in a frequency division duplexing (“

FDD”

) manner.

3. The system of claim 1, further including an antenna coupled to the full-duplex modem/outdoor unit and configured to switch between transmission of the modulated data to each of the half-duplex modem/outdoor units and configured to switch between reception of the modulated data from each of the half-duplex modem/outdoor units.

4. A time division duplexing wireless communication system, comprising:

a first half-duplex modem/outdoor unit configured to transmit even frames of data on a first channel and receive odd frames of data on a second channel;

a second half-duplex modem/outdoor unit configured to transmit odd frames of data on the first channel and receive even frames of data on the second channel; and

a frequency division full-duplex base station configured to alternate between;

simultaneous transmission of odd frames of modulated data to the first half-duplex modem/outdoor unit over the second channel and reception of odd frames of modulated data from the second half-duplex modem/outdoor unit over the first channel, and

simultaneous transmission of even frames of modulated data to the second half-duplex modem/outdoor unit over the second channel and reception of even frames of modulated data from the first half-duplex modem/outdoor unit over the first channel.

5. The system of claim 4, wherein the frequency division full-duplex base station is coupled to a smart antenna, the smart antenna configured to simultaneously transmit to the first half-duplex modem/outdoor unit and receive from the second half-duplex modem/outdoor unit during a first time frame and configured to simultaneously receive from the first half-duplex modem/outdoor unit and transmit to the second half-duplex modem/outdoor unit during a second time frame different from the first time frame.

6. The system of claim 4, further comprising a frequency synthesizer included in each of the half-duplex modem/outdoor units and configured to maintain a frequency offset between the first and second channels.

7. The time division duplexing wireless communication system of claim 4, wherein the first half-duplex modem/outdoor unit is in a first sector, and the second half-duplex modem/outdoor unit is in a second sector.

8. A method, comprising:

transmitting, by a first half-duplex modem/outdoor unit, even frames of data on a first channel;

receiving, by the first half-duplex modem/outdoor unit, odd frames of data on a second channel;

transmitting, by a second half-duplex modem/outdoor unit, simultaneously with said receiving by the first half-duplex modem/outdoor unit, odd frames of data on the first channel; and

receiving, by the second half-duplex modem/outdoor unit, simultaneously with said transmitting by the first half-duplex modem, even frames of data on the second channel.

9. The method of claim 8, further comprising:

transmitting, by a frequency division full-duplex base station, the odd frames of data to the first modem/outdoor unit and the even frames of data to the second modem/outdoor unit both on the second channel; and

receiving, alternatingly by the frequency division full-duplex base station, the even frames of data from the first modem/outdoor unit and the odd frames of data from the second modem/outdoor unit both on the first channel.

10. The method of claim 8, further comprising maintaining, by a frequency synthesizer in each of the half-duplex modem/outdoor units, a frequency offset between the first and second channels.

11. A method, comprising:

alternating, by a full-duplex modem/outdoor unit, between;

simultaneous transmission of odd frames of modulated data to a first half-duplex modem/outdoor unit in a first sector over a second channel and reception of odd frames of modulated data from a second half-duplex modem/outdoor unit in a second sector over a first channel, and

simultaneous transmission of even frames of modulated data to the second half-duplex modem/outdoor unit in the second sector over the second channel and reception of even frames of modulated data from the first half-duplex modem/outdoor unit in the first sector over the first channel.

12. The method of claim 11, comprising:

alternating, by the first half-duplex modem/outdoor unit and the second half-duplex modem/outdoor unit, transmission of modulated data over the first channel and reception of modulated data over the second channel; and

maintaining, by a frequency synthesizer included in each of the half-duplex modem/outdoor units, a frequency offset between the first and second channels.

13. The method of claim 12, wherein said maintaining the frequency offset includes applying the frequency offset to transmission over the first channel.