Pilot signals for use in multi-sector cells

摘要

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 requited to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.

主权项

1. A channel quality reporting method for use by a wireless terminal, the method comprising:
measuring at least one of an amplitude or a phase of a first pilot signal corresponding to a first pilot tone to produce a first measured signal value; generating a first channel quality indicator value from the first measured signal value according to a first function which uses at least the first measured signal value as an input; transmitting the first channel quality indicator value, wherein transmitting the first channel quality indicator value includes:
incorporating the first channel quality indicator value into a first message; andtransmitting the first message over a wireless communications link; measuring at least one of an amplitude or a phase of a second pilot signal corresponding to a second pilot tone to produce a second measured signal value, the second pilot signal having a different transmission power than the first pilot signal; generating a second channel quality indicator value from the second measured signal value according to a second function which uses at least the second measured signal value as an input; and transmitting the second channel quality indicator value, wherein transmitting the second channel quality indicator value includes:
incorporating the second channel quality indicator value into the first message; andtransmitting the second channel quality indicator value with the first value in the first message over the wireless communications link.