MAINTAINING PARALLEL REGISTRATIONS IN 2G/3G NETWORKS AND LTE FOR IMPROVING SET UP TIME OF CIRCUIT SWITCHED FALLBACK

摘要

A wireless terminal (30) is capable of communicating with a first network (22- 1) and a second network (22-1, 22-3), the first network (22- 1) being an LTE network. A wireless terminal method comprises (prior to making a request to participate in a circuit switched call with the second network) the wireless terminal (30) camping on a respective selected cell (of each of the first network and the second network and thereby having tuned to both the selected cell for the first network and the selected cell for the second network. In view of already camping on the selected cell of the second network, the wireless terminal (30) does not make a measurement with respect to a cell of the second network in a time period between the making of the request to participate in the circuit switch call and actual establishment of the circuit switched call with the second network.