Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators
First Claim
1. A method to operate on an apparatus for transmitting pilot tones in a multi-sector cell including at least a first sector and a second sector, the second sector being located adjacent to said first sector, the method comprising:
- transmitting, using a first tone, in said first sector during a first symbol time a first pilot signal having a first transmission power;
transmitting, using a second tone, in the first sector during the first symbol time a second pilot signal having a second transmission power which is different from the first transmission power;
transmitting, using the second tone, in the second sector during the first symbol time a third pilot signal having a third transmission power; and
transmitting, using the first tone, in the second sector during the first symbol time a fourth pilot signal having a fourth transmission power which is different from the third transmission power.
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Accused Products
Abstract
Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to the base station which uses both values to determine the transmit power required to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.
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Citations
25 Claims
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1. A method to operate on an apparatus for transmitting pilot tones in a multi-sector cell including at least a first sector and a second sector, the second sector being located adjacent to said first sector, the method comprising:
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transmitting, using a first tone, in said first sector during a first symbol time a first pilot signal having a first transmission power; transmitting, using a second tone, in the first sector during the first symbol time a second pilot signal having a second transmission power which is different from the first transmission power; transmitting, using the second tone, in the second sector during the first symbol time a third pilot signal having a third transmission power; and transmitting, using the first tone, in the second sector during the first symbol time a fourth pilot signal having a fourth transmission power which is different from the third transmission power. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for transmitting pilot tones in a multi-sector cell including at least a first sector and a second sector, the second sector being located adjacent to the first sector, comprising:
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at least one processor; and memory coupled to the at least one processor, wherein the memory includes instructions that are executable by the at least one processor to; transmit a first pilot signal at a first transmission power using a first tone in the first sector during a first symbol time; transmit a second pilot signal at a second transmission power using a second tone in the first sector during the first symbol time, where the second transmission power is different from the first transmission power; transmit a third pilot signal at a third transmission power using the second tone in the second sector during the first symbol time; transmit using the first tone, in the second sector during the first symbol time a fourth pilot signal having a fourth transmission power which is different from the third transmission power. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus for transmitting pilot tones in a multi-sector cell including at least a first sector and a second sector, the second sector being located adjacent to the first sector, comprising:
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means for determining a first transmission power for transmitting a first pilot signal, a second transmission power for transmitting a second pilot signal, and a third transmission power for transmitting a third pilot signal, wherein the first transmission power is different from the second transmission power; means for transmitting the first pilot signal at the first transmission power in the first sector using a first tone during a first symbol time; means for transmitting the second pilot at the second transmission power in the first sector using a second tone during the first symbol time; means for transmitting the third pilot signal at the third transmission power in the second sector using the second tone during the first symbol time; and means for transmitting, using the first tone, in the second sector during the first symbol time a fourth pilot signal having a fourth transmission power which is different from the third transmission power. - View Dependent Claims (16, 17, 18)
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19. A non-transitory computer-readable medium comprising code for:
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transmitting, using a first tone, in the first sector during a first symbol time a first pilot signal having a first transmission power; transmitting, using a second tone, in the first sector during the first symbol time a second pilot signal having a second transmission power which is different from the first transmission power; transmitting, using the second tone, in the second sector during the first symbol time a third pilot signal having a third transmission power; and transmitting, using the first tone, in the second sector during the first symbol time a fourth pilot signal having a fourth transmission power which is different from the third transmission power. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification