Beam wobbling for increased downlink coverage and capacity

Details Beam wobbling for increased downlink coverage and capacity Beam wobbling for increased downlink coverage and capacity

2007-04-10

2007-04-10

Feild, Joseph (Department: 2617)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S561000, C455S067110, C455S450000, C455S452200

Reexamination Certificate

active

10673483

ABSTRACT:
A method and apparatus for reducing signal interference within a cellular radio system to increase both coverage and capacity. The method and apparatus include altering the direction of beams within cell sectors is among discrete angular positions according to a predetermined, cyclic pattern. The predetermined, cyclic pattern varies in a group of adjacent cell sectors such that inter-cell interference is significantly reduced or eliminated by rotating at a different cycle the beams in adjacent cells. This discrete, angular movement of beams provides for downlink transmissions to be timed in such a way (i.e., scheduled) such that transmission to a user will occur in accordance with the beam and time slot having the best carrier to interference (C/I) ratio for that user.

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Shim et al., Should the Smart Antenna Be A Tracking Beam Array or Switching Beam Array?,IEEE Vehicular Technology Conference, 1998, pp. 494-498, no month.
Zekavat et al., “Smart Antenna Arrays With Oscillating Beam Patterns: Characterization of Transmit Diversity in Semi-Elliptic Coverage”,IEEE Transaction on Communications, vol. 50, No. 10, Oct. 2002, pp. 1549-1556.

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