St-ericsson Sa

Optis Circuit Technology, LLC

St-ericsson Sa, En Liquidation

Hongping Song

Chao Gong

Guiming Chang

The present invention discloses a method for implementing a video phone on a communication terminal, and the communication terminal thereof. The method comprises the steps of: determining, by the communication terminal, that it supports video phone services and is located in a second communication access network which supports the transmission of a second data contained in the video phone services; initiating or waiting for a video phone call; establishing and maintaining a video phone connection with a second communication terminal; and switching CS domain services to a first communication access network which supports the transmission of a first data contained in the CS domain services after the video phone connection is terminated. The second communication access network supports the transmission of the second data contained in the video phone services, so it is able to implement the video phone services in the second communication access network in accordance with a predetermined service process, and to implement the CS domain services via the first communication access network in an area not covered by the second communication access network.

Method for implementing video calls on communication terminal and communication terminal thereof

A cell search for recovering service provided to a mobile communication terminal that has a first communication subsystem capable of accessing a first access network and a second communication subsystem capable of accessing a second access network is performed with reduced power consumption. If the first communication subsystem looses coverage, the cell search is performed using a list of neighboring cells provided by the second communication subsystem and covered by other access network, rather than performing cell search in a full-band searching manner. If the list of cells remains unchanged and the first communication subsystem cannot successfully camp on a cell after a first number of attempts, a time interval for cell search is increased, so as to avoid meaningless search under poor network quality, and thus to reduce the power consumption of the mobile communication terminal.

Cell search control method, cell search control apparatus, mobile communication terminal, computer program and storage medium

The present invention provides a method for a communication terminal to reside in a plurality of networks, and a communication terminal thereof. The method comprises the steps of: acquiring a first signal intensity corresponding to a first communication network and acquiring a second signal intensity corresponding to a second communication network; when the first signal intensity is greater than a first threshold, registering a first service in the first communication network; when the second signal intensity is greater than a second threshold, registering a second service in the second communication network; when the second signal intensity is less than or equal to the second threshold, searching for the second communication network and registering the second service in the first communication network; and when the first signal intensity is less than or equal to the first threshold, searching for the first communication network and registering the first service in the second communication network. According to the present invention, the communication terminal can operate at both the first communication network and the second communication network simultaneously, and can execute the first service and second service at the same time. As a result, it is able to ensure a normal, basic communication service as well as a high-speed data service.

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Beijing, China

Hongping Song