The MTSO in turn relays the call to another base station within the cellular system or to a central office in the public switched telephone network.
Similarly, for a multi-user system with multiple antennas at the base station, the rank of the MIMO channel matrix from all users to the base station determines how many users can be served by the base station within the same time-frequency bandwidth.
The researchers studied the distance of the mother's home at the time of the birth from a phone mast, the total power output for base stations within 700 metres and the power density for base stations within 1,400 metres.
Let H k ⊂ M be the set of base stations within a radius of r from user k such that r ≤ ( P max η k · σ 2 ) 1 / β where β is the path loss coefficient and Pmax is the maximum power at each base station.
Path loss models can be used to make an estimation of the number of required base stations within a specific environment, but a detailed site-survey is advised for actual deployment of the WiMAX base stations.
A critical component of any mobile WiMAX network is the ASN Gateway, which aggregates subscriber and control traffic from base stations within an access network.
Second was the total power output (kW) from summation across all base stations within 700 m (because power density at ground level typically peaks at a distance of 200-500 m from the base station, and then falls off rapidly with distance 19 20).
The digital PCS network — still in its infancy — will need a projected 70,000 radio base stations within a few years and twice that in a decade.
Finally, we computed modelled power density (dBm) at each birth address for base stations within 1400 m, using a purpose designed propagation model.
Each exposure metric was divided into three categories: we used thirds (based on values for all cases and controls) for distance from nearest base station and modelled power density; for total power output, because of the large number (58%) of cases and controls with no base stations within 700 metres, we used a zero group together with two equal sized groups for non-zero values.
