A RAN may receive a call establishment request, on a first frequency, seeking to establish a call involving a WCD. In response to receiving the request, the RAN may select a plurality of wireless coverage areas, each defined using the first frequency. The RAN may determine that utilization of a first wireless coverage area of the selected wireless coverage areas meets a utilization threshold. In response, the RAN may determine that a strength at which the WCD receives signals from the first wireless coverage area exceeds the strengths at which the WCD receives signals from other wireless coverage areas in the plurality of wireless coverage areas by at least a signal strength differential value. Accordingly, the RAN may assign, to the WCD, a traffic channel from a second wireless coverage area, defined using a second frequency, for supporting the call.
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