Abstract:
A communication control method used in a mobile communication system in which in order to suppress an interference from a first cell to a second cell, a use-restricted subframe is set in the first cell comprises a coordinated transmission step of performing, in the use-restricted subframe, a coordinated transmission from the first cell and the second cell to a user terminal connected to the second cell.
Abstract:
A communication control method comprises a step A of feeding back for a plurality of number of times, by a UE 100-1 subject to null steering by a eNB 200-2, null-steering control information for controlling the null steering; and a step B of selecting, by the eNB 200-2, through a matching process in which the null-steering control information fed back from the UE 100-1 is checked with beamforming control information fed back from UEs 100-2, a pair UE that forms a pair with the UE 100-1 from among the UEs 100-2. In the step B, the eNB 200-2 applies, in addition to latest null-steering control information fed back this time from the UE 100-1, past null-steering control information fed back prior to a last time from the UE 100-1 to the matching process.
Abstract:
A communication control method pertaining to an embodiment of the present invention is for controlling dual connectivity communication which uses a master base station that establishes RRC connection with a user terminal and a secondary base station that provides a supplementary wireless resource to the user terminal. The communication control method comprises: a step in which the master base station receives, from the user terminal, a measurement report which includes measurement results found for each cell in the user terminal; and a step in which the secondary base station receives, from the master base station, a supplementary request for requesting the allocation of resources to the user terminal. In the step for receiving a supplementary request, the master base station includes, in the supplementary request, measurement results for a cell of the secondary base station which is included in the measurement results, and transmits the same.
Abstract:
A reference signal period during which an uplink reference signal utilized in channel estimation is transmitted is partially set in downlink frequency f1. UE transmits uplink reference signal to eNB by using the downlink frequency f1 during the reference signal period. The eNB receives the uplink reference signal from the UE by using the downlink frequency f1 during the reference signal period.
Abstract:
In a mobile communication system, UE 100-1 that transmits a radio signal to a transmission target receives a plurality of TPC parameters from eNB 200 and control a transmission power of the radio signal, on the basis of the plurality of TPC parameters. The plurality of TPC parameters include: a first TPC parameter (TPC parameter A, B) applied to a single transmission in which one radio signal is singly transmitted; and a second TPC parameter (TPC parameter C) applied to a simultaneous transmission in which a plurality of radio signals (radio signal SG1, SG2) different in frequency are simultaneously transmitted to a plurality of transmission targets.
Abstract:
A mobile communication system comprises a first user terminal having a scheduling function of assigning a radio resource used for the D2D communication. When the scheduling function is enabled, the first user terminal broadcasts periodically or aperiodically a message including identification information indicating that the first user terminal is a scheduling terminal that performs the assignment of the radio resource.
Abstract:
A base station is used for a mobile communication system that supports a dual connectivity. The base station includes a controller configured to establish an RRC connection with a user terminal, and to perform a mobility control in the dual connectivity.
Abstract:
A mobile communication system according to the present disclosure comprises: a base station; and a user terminal configured to perform uplink communication via a plurality of carriers including a first carrier. The user terminal comprises: a receiver configured to receive change information for changing a carrier used to transmit a physical uplink control channel to a carrier other than the first carrier from the base station performing uplink communication via at least the first carrier; and a terminal-side controller for changing the carrier used to transmit the physical uplink control channel to the carrier other than the first carrier based on the change information.
Abstract:
A communication control method is used in a mobile communication system that supports D2D communication that is direct device-to-device communication in which a data path does not pass through a core network. The communication control method comprises: a step A of transmitting, by a first user terminal camping on a first cell, a radio signal that includes a serving cell identifier for identifying the first cell; a step B of transmitting, by a second user terminal camping on a second cell, the serving cell identifier included in the radio signal from the second user terminal to the second cell when the radio signal is received from the first user terminal; and a step C of sharing, by the first cell and the second cell, scheduling information for controlling the D2D communication performed by the first user terminal and the second user terminal, on the basis of the serving cell identifier received by the second cell from the second user terminal.
Abstract:
A communication control method used in a cellular mobile communication system that supports inter-terminal communication that is direct radio communication capable of being performed between user terminals in a state where a radio connection with a network is established, comprises a step of transmitting, by a base station, maximum power information indicating maximum transmission power permitted in the inter-terminal communication.