CDMA pseudo-smart antenna selection
AssigneeNortel Networks Limited
InventorsPaul Newson, Frank Martin van Heeswyk
Life of this patent
Estimating the term…
Abstract
A CDMA base station servicing a plurality of mobile stations in a plurality of sectors monitors the reverse-link signal strength received by each antenna for each mobile station, and accordingly determines an optimum combination of antennas for forward-link transmission to each mobile station, whereby transmission to each mobile station may be accomplished with lower power, and whereby the dropped-call rate is reduced.
Claims14
In a two-way radio system including a base station and a plurality of mobile stations the base station having a plurality of differently-oriented antennas for transmitting on forward links to the mobile stations and for receiving on reverse links from the mobile stations:
- forward-link antenna selection apparatus for selecting antennas to use for forward link transmissions to each of the mobile stations, comprising:
- signal evaluation means for determining signal-to-noise ratio (SNR) for each mobile station of signals received on the reverse link via each of the antennas, time-averaging means for time-averaging the SNR's;
- and
- selection means for selecting antennas for forward-link transmission to each mobile station according to the time-averaged reverse-link SNR's for that mobile station according to a predetermined criterion.
In a two-way radio system including a base station and a plurality of mobile stations, the base station having a plurality of differently-oriented antennas for transmitting on forward links to the mobile stations and for receiving on reverse links from the mobile stations,
- a method of selecting antennas to use for the forward link transmissions to each of the mobile stations comprising the steps of:
- determining, signal-to-noise ratio (SNR) for each mobile station of signals received on the reverse link via each of the antennas;
- time-averaging the SNR's;
- and
- selecting antennas for forward-link transmission to each mobile station according to the time-averaged reverse-link SNR's for that mobile station according to a predetermined criterion.
Dependencies are inferred from the claim text.