The present disclosure proposes a method capable of, when a user simultaneously selects several PTT channels even in an apparatus not supporting a display, identifying the several PTT channels using alarm sounds for the PTT channels to transmit voices and distinguishing through which PTT channel a received voice is received, and a PTT terminal supporting the same. The present disclosure provides a push-to-talk (PTT) communication method, comprising: a step of connecting multiple PTT channels for communications between terminals; a step of storing history information representing received time of voice data through the multiple PTT channels; a step of selecting a PTT channel on the basis of the history information with respect to the multiple PTT channels, if an input of a PTT button is sensed; and a step of transmitting voice data to the selected PTT channel.

A device may broadcast an indication of an activity level of the device. The device may also receive a notification of an incoming message and receive at least one broadcast from at least one additional device also receiving the notification of the incoming message including an indication of at least one activity level of the at least one additional device. The device may compare its own activity level with the received at least one activity level. In response to determining that the activity level of the device is equal to or greater than a highest received at least one activity level, the device may display the notification of the incoming message.

A device may broadcast an indication of an activity level of the device. The device may also receive a notification of an incoming message and receive at least one broadcast from at least one additional device also receiving the notification of the incoming message including an indication of at least one activity level of the at least one additional device. The device may compare its own activity level with the received at least one activity level. In response to determining that the activity level of the device is equal to or greater than a highest received at least one activity level, the device may display the notification of the incoming message.

A device may broadcast an indication of an activity level of the device. The device may also receive a notification of an incoming message and receive at least one broadcast from at least one additional device also receiving the notification of the incoming message including an indication of at least one activity level of the at least one additional device. The device may compare its own activity level with the received at least one activity level. In response to determining that the activity level of the device is equal to or greater than a highest received at least one activity level, the device may display the notification of the incoming message.

A device may broadcast an indication of an activity level of the device. The device may also receive a notification of an incoming message and receive at least one broadcast from at least one additional device also receiving the notification of the incoming message including an indication of at least one activity level of the at least one additional device. The device may compare its own activity level with the received at least one activity level. In response to determining that the activity level of the device is equal to or greater than a highest received at least one activity level, the device may display the notification of the incoming message.

A method for paging at least one client node in a group communications system. The method is performed by a control node of the group communications system. The method comprising obtaining a need for paging the at least one client node in the group communications system and transmitting a paging message for the at least one client node in a Single Cell Point To Multipoint, SC-PTM, transmission to the at least one client node.

A method for paging at least one client node in a group communications system. The method is performed by a control node of the group communications system. The method comprising obtaining a need for paging the at least one client node in the group communications system and transmitting a paging message for the at least one client node in a Single Cell Point To Multipoint, SC-PTM, transmission to the at least one client node.

In a communication system, a plurality of base stations includes an MeNB being a first base station, and a plurality of SeNBs to be connected to the MeNB. At least one of control plane data about control of communication and user plane data about a user is transmitted to and received from a user equipment (UE) via the first base station being the MeNB. The control plane data and the user plane data are contained in information provided by a core network about communication with the UE. The communication system can simplify processing of at least one of control plane data and user plane data when a communication terminal device communicates with a plurality of base station devices.

In a communication system, a plurality of base stations includes an MeNB being a first base station, and a plurality of SeNBs to be connected to the MeNB. At least one of control plane data about control of communication and user plane data about a user is transmitted to and received from a user equipment (UE) via the first base station being the MeNB. The control plane data and the user plane data are contained in information provided by a core network about communication with the UE. The communication system can simplify processing of at least one of control plane data and user plane data when a communication terminal device communicates with a plurality of base station devices.

A mobile terminal device may include a radio processing circuit and a baseband processing circuit adapted to interact with the radio processing circuit. The baseband processing circuit may be configured to identify one or more multicast control data notification messages available for reception during a first multicast control data window, determine whether any of the one or more multicast control data notification messages are not received during the first multicast control data window, and trigger receiving of multicast control data of a second multicast control data window when a predefined quantity of the one or more multicast control data notification messages are not received during the first multicast control data window.