US 2004/0166887 A1 · Pilot signals for use in multi-sector cells

Abstract

Pilot signal transmission sequences and methods are described 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.

Claims45

Dependent claims

A channel quality reporting method for use by a wireless terminal, the method comprising:

measuring at least one of an amplitude and 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 said first measured signal value according to a first function which uses at least said first measured signal value as an input;
transmitting the first channel quality indicator value;
measuring at least one of an amplitude and 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 said first pilot signal;
generating a second channel quality indicator value from said second measured signal value according to a second function which uses at least said second measured signal value as an input;
and
transmitting the second channel quality indicator value.

4 more elements

Dependencies are inferred from the claim text.

Pilot signals for use in multi-sector cells

Life of this patent

Pilot signals for use in multi-sector cells

Life of this patent

Abstract

Claims45