초록 ▼

Wrong handoffs in a cellular radio telephone RF communications system can be minimized or eliminated without increasing locating receiver equipment requirements, field strength measurement time or system response time. Field strength measurements are made at handoff candidate cells and also at cells

Wrong handoffs in a cellular radio telephone RF communications system can be minimized or eliminated without increasing locating receiver equipment requirements, field strength measurement time or system response time. Field strength measurements are made at handoff candidate cells and also at cells neighboring (geographically proximate to) those candidate cells. A weighted average of the measured field strength of the candidate cell and the field strength measured in cells neighboring the candidate cell is calculated for each candidate cell (the field strengths measured by neighboring cells may be multiplied by a weighting factor of 0.5). The weighted averages for the candidate cells are compared, and the candidate cell corresponding to the highest average is selected to handle the mobile transceiver call. Statistical analysis shows that this technique for determining handoff candidates significantly reduces the probability that a call will be handed off to a cell which is geographically distant from the mobile transceiver－even in the presence of propagation anomalies.

대표청구항 ▼

In a cellular radio communications system of the type including plural stationary radio frequency receivers serving corresponding plural geographical cells, a mobile radio frequency communications apparatus including: radio frequency transmitting means for transmitting radio frequency signals to sai

In a cellular radio communications system of the type including plural stationary radio frequency receivers serving corresponding plural geographical cells, a mobile radio frequency communications apparatus including: radio frequency transmitting means for transmitting radio frequency signals to said plural stationary receivers; and control means, connected to and controlled by said transmitting means and operatively connected to said plural stationary receivers, for controlling said transmitting means to transmit radio signals to a stationary receiver selected in response to a value calculated from (a) the amplitude of a radio frequency signal transmitted by said transmitting means and received by said selected stationary receiver, and (b) the amplitude of said transmitted radio frequency signal received by at least one further stationary receiver serving a geographical cell in proximity to the geographical cell served by said selected stationary receiver.