A wearable device and method therefor. The wearable device comprises a processing unit, a storage unit, a positioning unit, a sensing unit, a communication unit, a power supply unit, a vibrator, a camera, a microphone, a loudspeaker and an emergency press key. The device detects the geographic location, body posture, and movepeoplet state, measures the forces applied on the device, and determines, on the basis of the comparison of the inclination angle value, acceleration value, and duration with corresponding thresholds in combination with the positive/negative signs of the duration and acceleration value, whether the device user is in the normal, abnormal or dangerous state. In case of the abnormal or dangerous state, different alert signals transmitted rescue cell phone and audiovisual communication can be enabled with the rescue cell phone, such that the device user can obtain help as soon as possible in different accidents.

An emergency notification system includes an emergency notification device equipped to a vehicle, a center device disposed at a service center and making a call with the emergency notification device through a wireless communication line, and a portable terminal device communicably connected with the emergency notification device in a wireless manner. The emergency notification device is configured to output a call reception signal to the portable terminal device when a predetermined condition is satisfied, acquire a phone number from the portable terminal device that received the call reception signal, and transmit, to the center device, the acquired phone number. The center device includes a phone number setting unit that sets the received phone number as a new destination phone number instead of a phone number of the emergency notification device which is preliminarily set as a destination phone number.

Briefly, in accordance with one or more embodiments, user equipment (UE) comprises processing circuitry to connect to a network via an untrusted wireless local area network (WLAN) and determine a location of the UE to provide the location of the UE if a voice call is made by the UE via the untrusted WLAN. The UE provides the location of the UE to a Public-Safety Answering Point (PSAP) via one or more network nodes of the network via the untrusted WLAN.

Method and management server for revoking group server identifiers of compromised group servers. One method includes determining, with a management server, an identity-based cryptographic signing key based on a group server identifier. The method also includes distributing, via the management server, the identity-based cryptographic signing key to a group server. The method further includes receiving, at the management server, a security status indicating that the security of the group server is compromised. The method also includes, responsive to receiving the security status, distributing, via the management server, a revocation of the group server identifier to a plurality of communication devices.

A method includes receiving a request to initiate an emergency call, directing, the mobile device to initiate the emergency call using a cellular network, receiving a network not available indication that the emergency call cannot be completed using the cellular network, selecting location information of the mobile device and requesting the emergency call be initiated by a VoIP client on the mobile device using the location information obtained from the selecting step.

A method and apparatus for providing a recommended action are disclosed. For example, the method receives first data that is measured via at least one sensor deployed at a venue, receives second data from at least one user endpoint device present at the venue, wherein the second data comprises data that is measured via a sensor associated with the at least one user endpoint device, applies a perception model of the venue to the first data and the second data that are received, generates at least one recommended action when a threshold is reached, wherein the threshold is established for generating the at least one recommended action, and provides an update to the perception model of the venue based on the at least one recommended action that is generated.

A communication device for handling a link failure comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute instructions stored in the storage unit. The instructions comprises communicating with a master base station via a first uplink (UL) carrier and a first downlink (DL) carrier; communicating with a secondary base station via a second UL carrier and a second DL carrier; detecting a link failure related to the secondary base station while communicating with the master base station; and transmitting information of the link failure and information of a measurement result related to the secondary base station to the master base station to report the link failure.

An emergency calling system includes a housing for accommodating a radio communication module; a battery mounting guide including a battery frame in which a battery is seated; a connector holder disposed at one end of the battery frame and a knob disposed at another end of the battery frame; a battery mounting unit, which is provided on one side of the housing and in which the battery mounting guide is fitted; a unit connector, which is disposed at an inner end of the battery mounting unit and is connected to a connector of the battery; and a locking unit for locking the battery mounting guide to the battery mounting unit. The emergency calling system enables easy replacement of the battery without requiring opening and closing the entire housing to replace the used battery.

A method for efficient wireless communications performed by a communications apparatus includes determining a cell according to a low priority list; and performing an attach procedure to try to attach to the cell for establishing an emergency call through the cell. The low priority list comprises information regarding a public land mobile network (PLMN) identity (ID), tracking area (TA) code, a cell ID and/or a closed subscriber group (CSG) ID of at least one attempted cell through which the communications apparatus has attempted but failed to establish an emergency call.

An emergency mode is provided in a portable electronic device for locating a survivor in a disaster. The device includes a wireless antenna to transmit and receive wireless signals; a memory to store one or more identifiers; a user interface to receive a command that enables the emergency mode. The device also includes one or more processors, which, in response to the command, detect via the wireless receiver a predetermined identifier that matches a stored identifier identifying a sender of the predetermined identifier as a trusted node. When the predetermined identifier and a timing measurement frame are received from the trusted node, the device sends a response to the trusted node to indicate its presence.