Multiple access wireless communications system using a multisector configuration
First Claim
1. A method of operating a transmitter in a cell which uses a set of tones to transmit into a first sector of said cell over a plurality of symbol times using tones from said set of tones, the cell including a second sector adjoining said first sector, said transmitter transmitting into said second sector on first and second communications channels, the first communications channel including a first subset of said set of tones during each of a first subset of said plurality of symbol times, the second communications channel including a second subset of said set of tones during each of said first subset of said plurality of times, said first subset of said set of tones and said second subset of said set of tones being different from each other during each symbol time, the method comprising:
- operating the transmitter to transmit on said first and second channels into said first sector in a synchronous manner with transmissions made by said transmitter into said second sector; and
controlling a total transmission power of the tones corresponding to the first channel in the first sector during said first subset of said plurality of symbol times to be greater than 20% and less than 500% of a total power of the tones corresponding to the first channel transmitted into the second sector, during said first subset of said plurality of symbol times.
3 Assignments
0 Petitions
Accused Products
Abstract
Power control methods and apparatus for use in a sectorized cell of an OFDM communications system are described. Each sector of a cell uses the same frequencies and transmission times and is synchronized with the other sectors in the cell in terms of tone frequencies used at any given time and symbol transmission times. Tones are allocated to channels in each cell in the same manner so that each channel in a sector has a corresponding channel in another sector. Power differences between channels in different sectors are maintained to be within a pre-selected power difference. Different channels in a cell are assigned different power levels. Wireless terminals are assigned to channels based on channel feedback information. Wireless terminals with poor channel conditions are allocated to higher power channels than wireless terminals with good channel conditions. Lower power channels often include more tones per symbol time than high power channels.
-
Citations
48 Claims
-
1. A method of operating a transmitter in a cell which uses a set of tones to transmit into a first sector of said cell over a plurality of symbol times using tones from said set of tones, the cell including a second sector adjoining said first sector, said transmitter transmitting into said second sector on first and second communications channels, the first communications channel including a first subset of said set of tones during each of a first subset of said plurality of symbol times, the second communications channel including a second subset of said set of tones during each of said first subset of said plurality of times, said first subset of said set of tones and said second subset of said set of tones being different from each other during each symbol time, the method comprising:
-
operating the transmitter to transmit on said first and second channels into said first sector in a synchronous manner with transmissions made by said transmitter into said second sector; and controlling a total transmission power of the tones corresponding to the first channel in the first sector during said first subset of said plurality of symbol times to be greater than 20% and less than 500% of a total power of the tones corresponding to the first channel transmitted into the second sector, during said first subset of said plurality of symbol times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A method of operating a transmitter in a cell which uses a set of tones to transmit into a first sector of said cell over a plurality of symbol times using tones from said set of tones, the cell including a second sector adjoining said first sector, said transmitter transmitting into said second sector on first and second communications channels, the first communications channel including a first subset of said set of tones during each of a first subset of said plurality of symbol times, the second communications channel including a second subset of said set of tones during each of said first subset of said plurality of times, said first subset of said set of tones and said second subset of said set of tones being different from each other during each symbol time, the method comprising:
-
operating the transmitter to transmit on said first and second channels into said first sector in a synchronous manner with transmissions made by said transmitter into said second sector; controlling a total transmission power of the tones corresponding to the first channel in the first sector during said first subset of said plurality of symbol times to be greater than 20% and less than 500% of a total power of the tones corresponding to the first channel transmitted into the second sector, during said first subset of said plurality of symbol times; controlling the total power of the tones transmitted in the first sector corresponding to the first channel during a fourth subset of said plurality of symbol times to be one of greater than 200% and less than 50% of the total power of the tones transmitted in said first sector corresponding to the second channel during said fourth subset of said plurality of symbol times wherein the fourth subset of said plurality symbol times includes at least 14 consecutive symbol times; and wherein the first and fourth subsets of said plurality of symbol times are the same.
-
-
20. A base station for use in a communications cell including first and second sectors, the second sector adjoining the first sector, the base station comprising:
-
a transmitter which uses a set of tones to transmit into a first sector of said cell over a plurality of symbol times using tones from a set of tones, said transmitter transmitting into said second sector on first and second communications channels, the first communications channel including a first subset of said set of tones during each of a first subset of said plurality of symbol times, the second communications channel including a second subset of said set of tones during each of said first subset of said plurality of times, said first subset of said set of tones and said second subset of said set of tones being different from each other during each symbol time; means for controlling the transmitter to transmit on said first and second channels into said first sector in a synchronous manner with transmissions made by said transmitter into said second sector; and power control means for controlling a total transmission power of the tones corresponding to the first channel in the first sector during said first subset of said plurality of symbol times to be greater than 20% and less than 500% of a total power of the tones corresponding to the first channel transmitted into the second sector, during said first subset of said plurality of symbol times. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. A method of operating a base station in a cell, the method comprising:
-
transmitting on first and second channels into first and second sectors of said cell in a synchronous manner, said first sector being adjacent said second sector, the first channel including different tones from said second channel during each of a first plurality of symbol times, the tones of the first communications channel being the same in said first and second sectors; and controlling a first transmission power and a second transmission power to keep the first and second transmission powers within a first intersector power range during said first plurality of symbol transmission time periods, said first transmission power being the total transmission power of the tones of the first channel in the first sector during said first plurality of symbol times, said second transmission power being the total transmission power of the tones of the first channel in the second sector during said first plurality of symbol times, said first intersector power range being between 20% and 500%. - View Dependent Claims (33, 34, 35, 36, 37)
-
-
38. A device including a processor configured to control a base station in a cell to implement a communications method, the method comprising:
-
transmitting on first and second channels into first and second sectors of said cell in a synchronous manner, said first sector being adjacent said second sector, the first channel including different tones from said second channel during each of a first plurality of symbol times, the tones of the first communications channel being the same in said first and second sectors, the tones of the second communications channel being the same in the first and second sectors; and controlling a first transmission power and a second transmission power to keep the first and second transmission powers within a first intersector power range during said first plurality of symbol transmission time periods, said first transmission power being the total transmission power of the tones of the first channel in the first sector during said first plurality of symbol times, said second transmission power being the total transmission power of the tones of the first channel in the second sector during said first plurality of symbol times, said first intersector power range being between 20% and 500%. - View Dependent Claims (39, 40)
-
-
41. A computer readable medium embodying machine executable instructions for controlling a base station in a cell to implement a communications method, the method comprising:
-
transmitting on first and second channels into first and second sectors of said cell in a synchronous manner, said first sector being adjacent said second sector, the first channel including different tones from said second channel during each of a first plurality of symbol times, the tones of the first communications channel being the same in said first and second sectors, the tones of the second communications channel being the same in the first and second sectors, and controlling a first transmission power and a second transmission power to keep the first and second transmission powers within a first intersector power range during said first plurality of symbol transmission time periods, said first transmission power being the total transmission power of the tones of the first channel in the first sector during said first plurality of symbol times, said second transmission power being the total transmission power of the tones of the first channel in the second sector during said first plurality of symbol times, said first intersector power range being between 20% and 500%. - View Dependent Claims (42, 43)
-
-
44. A base station in a cell, comprising:
-
a transmitter module for transmitting on first and second channels into first and second sectors of said cell in a synchronous manner, said first sector being adjacent said second sector, the first channel including different tones from said second channel during each of a first plurality of symbol times, the tones of the first communications channel being the same in said first and second sectors, the tones of the second communications channel being the same in the first and second sectors, and a control module for controlling a first transmission power and a second transmission power to keep the first and second transmission powers within a first intersector power range during said first plurality of symbol transmission time periods, said first transmission power being the total transmission power of the tones of the first channel in the first sector during said first plurality of symbol times, said second transmission power being the total transmission power of the tones of the first channel in the second sector during said first plurality of symbol times, said first intersector power range being between 20% and 500%. - View Dependent Claims (45, 46)
-
-
47. A base station in a cell, comprising:
-
transmitter means for transmitting on first and second channels into first and second sectors of said cell in a synchronous manner, said first sector being adjacent said second sector, the first channels including different tones from said second cannel during each of a first plurality of symbol times, the tones of the first communications channel being the same in said first and second sectors, the tones of the second communications channel being the same in the first and second sectors, and control means for controlling a first transmission power and a second transmission power to keep the first and second transmission powers within a first intersector power range during said first plurality of symbol transmission time periods, said first transmission power being the total transmission power of the tones of the first channel in the first sector during said first plurality of symbol times, said second transmission power being the total transmission power of the tones of the first channel in the second sector during said first plurality of symbol times, said first intersector power range being between 20% and 500%. - View Dependent Claims (48)
-
Specification