A method for changing a communication network for video communication is provided. The method includes performing, by a user equipment (UE), video communication through a mobile communication network; searching for whether there is a wireless local area network (WLAN) accessible by the UE; displaying, if a WLAN accessible by the UE is found, the accessible WLAN; and when the displayed WLAN is selected by a user, changing a communication network for the video communication to perform the video communication through the selected WLAN.

A hardened VoIP system is presented that includes secure push-to-talk voice functionality. Through the addition of encryption, authentication, user filtering, and integration with new and existing LMR systems, a secure voice platform ensures malicious software, unauthorized access and brute force security attacks will not compromise the voice communications of the system. The VoIP system is engineered to ensure graceful system degradation in the event of maintenance activities, natural disasters and failure modes. The hardened VoIP system offers the functions a LMR trunking system while utilizing broadband connections. Private calls, group calls, Emergency Alarms with covert monitoring capability, scanning and priority scanning may be incorporated into the system. The system includes a VoIP controller that serves as a trunking controller, manages available VoIP based conference bridges, and assigns them as needed to the parties involved in each voice call. The system includes multiple fallback methods that may be prioritized based on pre-failure analytics.

Telecommunication systems with packet-switched multimedia terminals and nodes for packet-switched multimedia sessions and with servers for exchanging multimedia signaling information for the packet-switched multimedia sessions and with terminating units are provided with gateways for in response to transferral messages originating from the packet-switched multimedia terminals and arriving at the servers transferring packet-switched multimedia sessions between packet-switched multimedia terminals and nodes to circuit-switched calls between gateways and circuit-switched terminals via switches, to continue possibly interrupted sessions via replacing calls. The servers send invitation messages to gateways, which send setup messages to switches for setting up circuit-switched calls via partly alternative communication paths. The servers send information messages to terminating units for bringing the terminating units from session level to call level. Preferably, a packet-switched multimedia terminal and a circuit-switched terminal are one and the same terminal.

A vehicle remote support system includes a communication system that operates over a plurality of parallel wireless network connections to provide low-latency video from vehicle to a remote support server that provides remote support to the vehicle dependent on real-time video. The vehicle includes a source that encodes multiple versions of the original video segments (e.g., one per wireless network connection) and transmits the multiple versions of the segments to a sink at the remote support server over the respective wireless connections. This redundant multi-path communication system rationally allocates network resources to the managed video streams and balances bandwidth against latency in order to avoid network congestion and safety issues associated with single-path transmissions. In other embodiments, a similar communication system that transmits video or other real-time messages between a source and a sink may be utilized in cloud robotics applications.

In 5G cell (230) of 5G system (200), upon detecting that access to the 5G system (200) is barred, the 5G system (200) is congested, 5G core network (220) of the 5G system (200) does not support IMS-type communication service, or fallback to 4G system (300) is instructed, UE (100) selects 4G cell (330) of the 4G system (300) as a target cell for connection. The UE (100) transmits a connection request signal for the IMS-type communication service to the target cell for connection.

A wireless camera includes a wireless signal transceiver device, a processor circuit, and a camera device. The processor circuit controls the wireless signal transceiver device to operate at a Miracast mode in response to a first command, in order to connect with an external device. The camera device shots an object to generate first video streaming data having a first format. Under the Miracast mode, the processor circuit repacks the first video streaming data as second video streaming data having a second format, and transmits the second video streaming data to the external device via the wireless signal transceiver device, and in order to display the second video streaming data by the external device.

A telematics module includes modems and a modem selecting module, which communicates with a network device according to a SCTP. The modem selecting module includes RAT network and signal status modules. The RAT network module determines a RAT network availability status of each of the modems. The signal status module determines signal quality status parameters of each of the modems. The modem selecting module: determines which one of the modems has a higher data throughput based on the RAT network availability status and the signal quality status parameters of each of the modems; sets the one of the modems with the higher data throughput as an active modem and sets another modem as inactive, such that the another modem is in at least one of a standby or backup mode; and communicates with the network device via the one of the modems according to the SCTP.

A Network Function service provider in a 5GC, for managing SRVCC handover for a UE having a voice session anchored in an IMS in a PS domain in the 5GC is provided. The SRVCC handover moves the voice session to a CS domain in a legacy network. The NF service provider receives an SRVCC handover required message from an NF service consumer, comprising information about a target ID of the legacy network and a target transparent RAN container. The NF service provider obtains, based on the information received in the handover required message, a legacy target transparent RAN container comprising information required for the target RAN node in the legacy radio access network to accept the handover, an identifier related to the voice session, an STN-SR and legacy CS domain security information. The NF service provider initiates handover by transmitting the obtained information to the legacy CN over Sv-interface.

A mobile application gateway for connecting devices on a cellular network with individual networks, such as enterprise voice and data networks and/or residential networks. The effects of the present invention are far reaching in terms of transferring effective call control from the cellular network into the control of the individual network such as the enterprise, and enabling new business models for the purchase of cellular service from a public cellular carrier by an enterprise. The invention may consist of a primarily of core network and services components based on the IMS network architecture, and is backward compatible to support legacy systems in place in current telecom and data networks.

A method for changing a communication network for video communication is provided. The method includes performing, by a user equipment (UE), video communication through a mobile communication network; searching for whether there is a wireless local area network (WLAN) accessible by the UE; displaying, if a WLAN accessible by the UE is found, the accessible WLAN; and when the displayed WLAN is selected by a user, changing a communication network for the video communication to perform the video communication through the selected WLAN.