A communications device configured to transmit signals representing data to one or more in-coverage communications devices forming with the communications device a group, one of the in-coverage communications devices acting as an active relay node for the communications device, so that the in-coverage communications device can transmit signals representing the data to the infrastructure equipment of the mobile communications network, and to receive signals representing the data from the in-coverage communications device acting as the active relay node. The signals transmitted to the in-coverage communications device are received according to a device-to-device communications protocol, wherein the signals transmitted by the communications device or received by the communications device include an identifier which identifies the signals to the in-coverage communications device. One of the other in-coverage communications device can be selected by the infrastructure equipment to act as the active relay node.

The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for performing, by a first user equipment (UE) connected with one or more UEs, a handover procedure in a wireless communication system, the method comprising: transmitting, to a serving cell, first information including a channel quality between the first UE and the one or more UEs based on a predetermined configuration; receiving, from the serving cell, second information indicating a second UE to perform a handover procedure with the first UE among the one or more UEs in response to the first information; and performing the handover procedure with the second UE indicated to perform the handover procedure by the second information.

This disclosure relates to techniques for supporting message mapping via time and/or frequency indexing. For example, these techniques may be applied to device-to-device wireless communication. For example, device to device discovery may use message mapping via frequency indexing. A portion of the payload of a message, such as a discovery message, may be offloaded to a frequency and/or time index. A receiving device may determine the offloaded portion of the payload based on the frequency and/or time (e.g., subcarrier and/or slot) used to transmit the message.

Embodiments of the present invention relate to a method for obtaining radio capability information of a terminal, a core network entity, a base station, and a terminal. When a first terminal changes from a first communication path for the first terminal to directly access a network to a second communication path for the first terminal to access the network by using a second terminal, the first terminal receives a first message that is sent by a base station to obtain radio capability information of the first terminal; and then sends the radio capability information of the first terminal to the base station, where the radio capability information includes information about a manner of connection between the first terminal and the second terminal and identification information of the second terminal.

A device (1) is configured to derive a first security key based on information relating to a first node (17), to request use of or to use a further device (9) as a relay to the mobile communication network and to determine whether the further device is connected to the first node and/or receive a message when another device, e.g. the first node, has determined that the further device is not connected to the first node. The device is further configured to, upon determining that the further device is not connected to the first node or upon receipt of the message, derive a second security key based on information relating to a second node (11) to which the further device is connected and transmit information via the further device, the information being encrypted using the second security key.

A method for handover to a relay node, a related device, and a system where the method includes sending, by a base station of a target cell in an initial random access procedure initiated by a terminal device for the target cell, indication information to the terminal device using a random access message to instruct the terminal device to report information about a candidate relay device corresponding to the terminal device, receiving the information about the candidate relay device from the terminal device determining, in the candidate relay device according to the information about the candidate relay device, a target relay node used for relay communication between the terminal device and the base station, and handing over the terminal device to the target relay node.

[Object] To realize handover in relay communication using a relay terminal in a more satisfactory manner.

[Solution] A communication device including: a communication unit configured to perform wireless communication; and a control unit configured to acquire information regarding a communication quality of one or more radio links including at least one of a direct first radio link or a second radio link via a relay terminal, which is configured to be movable, between a remote terminal and a base station, and to switch the radio link to be used in communication between the remote terminal and the base station on the basis of the acquired information regarding the communication quality.

Embodiments of the present invention provide an information transmission method and a device. The method includes: sending, by a first device, first information to a second device, where the first information includes a cell identity of a first cell, the first cell is a serving cell of the first device, the second device accesses the first cell by using the first device, and the first information is used by the second device to determine the cell identity of the first cell.

A method of operating first and second terminal devices for transmitting data in a device-to-device communication mode in a wireless telecommunications system supporting communications on a first carrier operating over a first frequency band and a second carrier operating over a second frequency band. The first terminal device transmits control signalling on the first carrier and this is received by the second terminal device. The control signalling comprises an indication of that the first terminal device intends to transmit data to the second terminal device using the device-to-device communication mode on the second carrier after a carrier switch-over time. The first terminal device then proceeds to transmit data to the second terminal device on the second carrier using the device-to-device communication mode after the carrier switch-over time. The first and second terminal devices may cease communications on the second carrier after a carrier switch-back time.

A method for performing, by a first UE, device-to-device (D2D) communication in a wireless communication system includes: transmitting, to a first eNB, transmission/reception (TX/RX) chain number information indicating the number of supported TX/RV radio frequency (RF) chains; receiving, from the first eNB, a first control message including D2D resource pool configuration information of the first eNB; receiving, from the first eNB, a second control message including D2D resource pool configuration information of a second eNB; and transmitting a first D2D signal to the first eNB and/or transmitting a second D2D signal to the second eNB using one or more TX RF chains when a predetermined condition is satisfied.