Abstract:
A communication control method according to the present invention is used in a mobile communication system that supports D2D communication that is direct Device-to-Device communication. The communication control method comprises a step of transmitting, by a first user terminal in a cell coverage, to another user terminal, identification information for identifying that the first user terminal is located in a cell.
Abstract:
A user terminal according to an embodiment is a user terminal configured to exist in a first cell in a mobile communication system that supports a D2D proximity service between the user terminal configured to exist in the first cell and a user terminal configured to exist in a second cell. The user terminal comprises: a controller configured to measure a timing difference between a timing of a signal received from the first cell and a timing of a signal received from the second cell; and a transmitter configured to notify a base station configured to manage the first cell, of the timing difference.
Abstract:
A communication system 1 comprises: a radio base station 100 having a first coverage area 100 A; an access point 200 having a second coverage area 200 A; and a detection assistance apparatus 300 having a third coverage area 300 A. A radio terminal 100 existing in the radio base station 100 starts a discovery procedure for the access point 200, after detecting a detection-use signal broadcast from the detection assistance apparatus 300.
Abstract:
In the communication control method according to the present embodiment, a user terminal transmits a scheduling assignment indicating the location of a radio resource used in a reception of communication data by direct device-to-device communication. The user terminal transmits the communication data including initial transmission data and retransmission data by using the radio resource. The retransmission data is transmitted depending on the number of times of re-transmissions associated with a predetermined scheduling assignment by using a predetermined radio resource of which the location is indicated by the predetermined scheduling assignment.
Abstract:
A user terminal transmits and/or receives downlink traffic through cellular/WLAN aggregation by using a first communication and a second communication. The downlink traffic is divided into traffic for cellular communication network and traffic for WLAN. The user terminal further transmits an uplink control signal through the cellular/WLAN aggregation by using the first communication and without using the second communication. The user terminal further notifies the base station of a report regarding the second communication by the first communication. The report indicates a radio link failure in the second communication and includes a reason for the radio link failure. The reason includes a first reason and a second reason. The first reason relates to a radio environment in the second communication. The second reason does not relate to the radio environment.
Abstract:
A communication control method according to a first aspect is a method for performing offloading to switch traffic to be transmitted and received between a user terminal and a cellular base station to a wireless LAN system. The communication control method comprises: a step A in which the user terminal transmits a wireless LAN terminal identifier being an identifier of the user terminal in the wireless LAN system, to the cellular base station; and a step B in which the cellular base station, before performing the offloading, transmits the wireless LAN terminal identifier received from the user terminal to an access point of the wireless LAN system. The wireless LAN terminal identifier is used for wireless authentication of the user terminal at the access point.
Abstract:
A communication control method comprising: setting at least part of downlink radio resources available in a first cell to a first resource at a first base station, wherein the first base station is configured to manage the first cell connected to a user terminal and restricts transmission in the first resource; sending information from the first base station to the user terminal, wherein the information indicates the first resource; performing measurement of received power and/or reception quality of a reference signal at the user terminal, wherein a second cell transmits the reference signal with using the first resource; transmitting a measurement report from the user terminal to the first base station, wherein the measurement report includes a result of the measurement; and determining whether or not the first cell is settable to a switch off mode, on the basis of the measurement report, at the first base station, wherein the switch off mode includes stopping the first cell from transmitting a signal.
Abstract:
A first radio base station counts a first handover number that is the number of handovers to a cell managed by the first radio base station and a second handover number that is the number of handovers from the cell in a predetermined period of time; and notifies a second radio base station or an operation, administration, and maintenance (OAM) apparatus of the first handover number and the second handover number.
Abstract:
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.
Abstract:
A mobile communication system according to the present disclosure supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which a data path does not pass through the core network. The mobile communication system has a user terminal that performs a process of discovering a partner terminal in the D2D communication or performs the D2D communication. A plurality of radio resources that are the time-frequency resources that can be used for the process of discovering or the D2D communication consist of radio resources associated with transmission power used for the process of discovering or the D2D communication. The user terminal performs the process of discovering or the D2D communication on the basis of the transmission power associated with the radio resource used by the user terminal.