In order for making MTC more efficient and/or secure, a base station (20) forming a communication system connects a UE (10) to a core network. A node (50) serves as an entering point to the core network for a service provider, and transmits traffic between the service provider and the UE (10). The node (50) establishes, as a connection to the base station (20), a first connection for directly transceiving messages between the node (50) and the base station (20). Alternatively, the node (50) establishes a second connection for transparently transceiving the messages through a different node (30) that is placed within the core network and has established a different secure connection to the base station (20).

A user terminal in a mobile communication system supporting D2D communication that is direct device-to-device communication comprises a controller configured to establish a D2D communication bearer used for the direct D2D communication between the user terminal and other user terminal that is a partner terminal of the D2D communication, in accordance with a parameter that characterizes a property of D2D data transmitted by the D2D communication; and a transmitter configured to transmit the D2D data corresponding to the parameter via the D2D communication bearer depending on the parameter by using a radio resource assigned in accordance with the parameter.

The present invention relates to a method for performing a D2D discovery and a terminal using the same. Particularly, the present invention relates to a method for performing a D2D discovery, which compares a congestion level of another discovery slot selected randomly or according to a preset pattern with a threshold or a congestion level of a current discovery slot and determines a discovery slot to transmit a discovery message and a transmission period of the discovery message according to a result of the comparison, and a terminal using the same. The present invention relates to a method for performing a D2D discovery using discovery resources including a plurality of discovery slots, and a terminal performing the same, the method comprising the steps of: broadcasting a discovery message by using a first discovery slot; comparing a congestion level of a selected second discovery slot with a predetermined congestion level value; determining a discovery slot to broadcast the discovery message on the basis of a result of the comparison; and broadcasting the discovery message by using the determined discovery slot.

Provided are a method for establishing a radio resource control (RRC) connection for a cell of a terminal and a terminal using the method. The method determines the number of times of failure in RRC connection establishment for the cell and applies a first access class barring (ACB) parameter or a second ACB parameter on the basis of the number of times of the failure, wherein the second ACB parameter is a parameter which increases an access blocking probability for the cell in comparison with the first ACB parameter.

The present invention relates to a scheduling method between terminals for a search resource allocation in direct device to device communication and a device thereof. The present invention relates to, as a search resource allocation method of a terminal which performs device to device (D2D) communication, a proximity searching method and a device thereof, and the method comprises the steps of: transmitting and receiving a signal through a wireless resource determined so as to explicitly or implicitly transmit and receive a contention index of the terminal; selecting a search resource on the basis of a response signal when the response signal is received through the wireless resource; and performing a search for the D2D communication by using the selected search resource.

Methods, systems, and devices are described for switching a mode of operations in device to device (D2D) communications. A UE within the coverage area of a base station may communicate directly with other UEs using a centralized transmission resource schedule. Prior to experiencing radio link failure (RLF), the UE may determine that switching parameters have been met and transition to an intermediate mode based on a distributed transmission schedule using a pool of resources established by the base station. In one example, the switching parameters may be received from the base station in a connection response message. In another example, the UE may send a switching request to the base station prior to initiating the transition to the intermediate mode. In some cases, after the transition to the intermediate mode, the UE may experience a radio link failure and transition to a distributed mode using a predetermined pool of resources.

In one aspect of this disclosure, a method and an electronic apparatus executing a method, the method including detecting a disconnection of a call with an external electronic apparatus, when the disconnection is detected, generating and storing a call disconnection message including a notifier indicating a cause for the disconnection, and transmitting the stored call disconnection message to the external electronic apparatus according to a communication receptivity condition. In another aspect of this disclosure, a method and an electronic apparatus comprising a communication module executing a call with an external electronic apparatus, and a processor executing the method, including detecting disconnection of the call with the external electronic apparatus, when the disconnection is detected, generating and store a call disconnection message including a notifier indicating a cause for the disconnection, and transmitting the stored call disconnection message to the external electronic apparatus according to a communication receptivity condition.

A device for providing downlink channel access for non-operator devices includes at least one processor circuit. The at least one processor circuit is configured to establish a local connection with an operator device that is serviced by a network operator. The at least one processor circuit is configured to provide, to the operator device over the local connection, a request to establish a connection to a network, the request comprising a destination address. The at least one processor circuit is configured to receive, from the operator device over the local connection, control information for reception of a downlink channel provisioned by the network operator for the operator device. The at least one processor circuit is configured to receive downlink data associated with the destination address on the downlink channel and provide, to the operator device, uplink data associated with the destination address for transmission to the network.

Disclosed herein is a system and method for wireless connection of at least a first device to at least a second device. The devices are each configured with a sensor for receiving a signal, a data connection element for providing a data transmission channel between the devices, and a control element. The devices each have a timing device for determining the time of reception, with the timing devices can be activated with the reception of the signal. The timing devices are started with the reception of the signal. Furthermore, the devices are configured to record the signal received by the sensor and the time of reception of the signal and to provide to each other the signals received by the sensors and the times of reception of the signals, to compare them with each other and to use them as an identification feature.

Methods and systems for transmitting signals between electronic devices are provided. First, a first electronic device receives an instruction, and continuously generates a specific signal according to the instruction. In some embodiments, at least one motion sensor can detect the motion of the first electronic device to generate the instruction. The first electronic device broadcasts the specific signal via a wireless network. Then, at least one secondary electronic device receives the specific signal via a wireless network. The secondary electronic device connects to the first electronic device via a wireless network, and instructs the first electronic device to stop generating the specific signal.