Abstract: A device and a method to search a public landline mobile network for a radio access technology network, consisting of scanning a frequency band, wherein the signal strengths for the frequencies in the frequency band are measured, and performing an analysis of the signal strengths for various sets of frequencies within the frequency band in order to differentiate between different radio access technology networks based on the uniformity of the signal strengths of the frequencies in their respective operating bandwidths within the frequency band.

Abstract: A communication terminal is described comprising a communication circuit configured to establish a first radio link to a first communication network; and to receive, via the first radio link to the first communication network, a message from the first communication network that indicates establishing a second radio link to a second communication network for a call; a controller configured to select at least one channel frequency from a plurality of stored channel frequencies provided for the call to the second communication network; control the communication circuit to establish the second radio link to the second communication network using the selected at least one channel frequency and to establish the call via the established second radio link.

Abstract: Techniques described herein may enable a wireless cellular network to transfer a call from a packet-switched (PS) portion of the wireless cellular network to a circuit-switched (CS) portion of the wireless cellular network, in a manner that ensures that the CS network receiving the call can actually support the call. For instance, before the wireless cellular network selects RAT for the CS network for transferring a call, the wireless cellular network may identify a call type for the call (e.g., simple voice call, video call, etc.), identify a RAT for the CS network that can support the call type, and proceed to transfer the call to the CS portion of the wireless cellular network that can support the call type, thus ensuring that the call is not dropped as a result of the transfer.

Abstract: An improved circuit switched fallback (CSFB) method is disclosed, in which failures following several abnormal cases not anticipated by the 3GGP specification are avoided. User equipment implementing the improved CSFB method demonstrate increased performance in terms of call success rate and hence provide an improved user experience and an edge over LTE modem competitors. The improved CSFB method can be included in the 3GPP standards for such abnormal case handling and CSFB call recovery.