Abstract:
In the communication control method according to the present embodiment, a user terminal receives a scheduling assignment indicating a location of a radio resource used in a reception of communication data by direct device-to-device communication. The user terminal decides a terminal identifier that is different from a terminal identifier indicating another user terminal included in the scheduling assignment, as a terminal identifier indicating the user terminal. The user terminal transmits a scheduling assignment including the decided terminal identifier.
Abstract:
An MBMS control method comprises the steps of: transmitting, by a eNB 200 included in the network, an MBMS counting request for counting UE 100s that either receive or have an interest in receiving the MBMS service, by using a predetermined signal that can be received by a user terminal in an RRC idle state; receiving, by an MBMS-compliant UE 100 that supports MBMS reception, the MBMS counting request transmitted by using the predetermined signal, in the RRC idle state; and performing, by the MBMS-compliant UE 100, a predetermined operation for transmitting an MBMS counting response, on the basis of the received MBMS counting request.
Abstract:
UE 100-1 transmits null-steering control information for directing a null to the UE 100-1 in a transmission from eNB 200-2 to UE 100-2, and first channel quality information on a modulation and coding scheme recommended when the null-steering control information is adopted in the eNB 200-2, to eNB 200-1. The UE 100-1 controls to transmit, instead of transmitting the first channel quality information or in addition to transmitting the first channel quality information, second channel quality information on a modulation and coding scheme recommended when the null-steering control information is not adopted in the eNB 200-2, to the eNB 200-1.
Abstract:
eNB 200-2 receives beamforming control information fed back from each of a plurality of UEs 100-2 that are connected with the eNB 200-2, and null-steering control information fed back from UE 100-1. The eNB 200-2 calculates, for each of the plurality of UEs 100-2, assignment priority by which to assign the same radio resource as a radio resource assigned to the UE 100-1, on the basis of reference priority derived from a scheduling algorithm, and matching degree between the null-steering control information and the beamforming control information. The eNB 200-2 assigns the same radio resource to a UE 100-2 having the highest assignment priority, from among the plurality of UEs 100-2.
Abstract:
A communication control method according to a first aspect includes: starting, by a user terminal, communication according to a dual connectivity scheme, by setting a first base station as a master base station and setting a second base station as a secondary base station; and performing a procedure for changing roles of the master base station and the secondary base station, between the first base station and the second base station. The master base station is a base station that establishes an RRC connection with the user terminal in the dual connectivity scheme. The secondary base station is a base station that provides additional radio resources to the user terminal in the dual connectivity scheme.
Abstract:
A first user terminal supporting D2D (Device-to-Device) communication comprises a processor and a memory coupled to the processor. The processor is configured to perform processes of: receiving, D2D resource information from a base station, determining data radio resources and control radio resources on the basis of the D2D resource information, from among D2D radio resources available for the D2D communication, transmitting, D2D communication control information by using the determined control radio resources to a second user terminal, the D2D communication control information indicating locations of the determined data radio resources, and transmitting and retransmitting, D2D communication data by using the determined data radio resources to the second user terminal.
Abstract:
A mobile communication system includes a first base station, a second base station connected with the first base station via an X2 interface, and a user terminal configured to receive data from both the first and second base stations using radio resources provided by both the first and second base stations. The first base station comprises a controller including at least one processor, the controller executing functions of plural layers. The plural layers include a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. The controller is configured to receive user data addressed to the user terminal from a core network, convert the user data to PDCP data unit provided with a sequence number, in the PDCP layer, and transmit the PDCP data unit to the second base station from the PDCP layer.
Abstract:
A radio communication apparatus according to a first aspect is an apparatus for supporting cellular communication and wireless LAN communication. A protocol stack for the cellular communication includes: a cellular lower layer including a physical layer and a MAC layer; and a cellular upper layer higher than the MAC layer. The radio communication apparatus comprises a controller configured to set a specific mode using a protocol stack of the wireless LAN communication instead of the cellular lower layer.
Abstract:
A communication control method is a method for performing offload to transfer a traffic load of a cellular base station to an access point. The communication control method comprises a step of maintaining without releasing the first connection, by a user terminal that have established a first connection with the cellular base station, even when the offload is started after establishing a second connection with the access point; and a determining step of determining, by the user terminal, whether the offload is continued or canceled after the offload is started.
Abstract:
A communication control method includes: a step A of receiving, by UE 100-1 in a coverage of the mobile communication system, broadcast information transmitted from eNB 200; a step B of transferring, by the UE 100-1, the broadcast information to UE 100-2 outside the coverage of the mobile communication system; and a step C of receiving, by the UE 100-2, the broadcast information transferred from the UE 100-1.