Use of speed of movement of UE as basis to control connection setup

In a system comprising a first radio access network (RAN) and a second RAN interconnected with the first RAN, a computing apparatus disposed in the second RAN and comprising:

• a network communication interface through which the computing apparatus is configured to engage in communication with the first RAN;
• a processing unit;
• non-transitory data storage;
• and
• program instructions stored in the data storage and executable by the processing unit to carry out operations for controlling connection setup for a user equipment device (UE) when the UE is served by the first RAN,
• wherein the operations include receiving from the UE, via the first RAN and the network communication interface, a call-setup request that requests the second RAN to serve the UE with a call,
• wherein the operations further include responding to the call-setup request by transmitting to the UE, via the network communication interface and the first RAN, a directive for the UE to transition from being served by the first RAN to being served by the second RAN to engage in the call, the directive specifying, for the call, second-RAN coverage in which the call is to be served, and
• wherein the operations further include making a determination of whether speed of movement of the UE is threshold high and, based on the determination, controlling whether the computing apparatus additionally specifies in the directive a traffic-channel assignment for the call, wherein (i) based on the determination being that speed of movement of the UE is not threshold high, the computing apparatus does not additionally specify in the directive a traffic-channel assignment for the call, whereas (ii) based on the determination being that the speed of movement of the UE is threshold high, the computing apparatus additionally specifies in the directive a traffic-channel assignment for the call.