NTT DoCoMo

About: NTT DoCoMo is a based out in . It is known for research contribution in the topics: Base station & Mobile station. The organization has 4032 authors who have published 8655 publications receiving 160533 citations.

Radio communication system, radio communication method, and base station

Abstract: A base station according to the present invention includes: a detecting unit (126) configured to detect a discard of the uplink user data received from a radio terminal; and a scheduling unit (120a) configured to transmit an AG or an RG instructing a decrease of an SG assigned to the radio terminal, when the discard of the uplink user data is detected by the detecting unit.

User equipment and base station

Abstract: Techniques are disclosed for implementing efficient transmission of uplink packets when the uplink transmission direction is changed in a split bearer. One aspect of the present invention relates to user equipment, comprising: a transmission and reception unit configured to communicate with a master base station and a secondary base station simultaneously in dual connectivity; an RLC (Radio Link Control) layer processing unit configured to have an RLC layer for the master base station and an RLC layer for the secondary base station; and a PDCP (Packet Data Convergence Protocol) layer processing unit configured to have a PDCP layer transmitting and receiving data to/from the RLC layer for the master base station and the RLC layer for the secondary base station, wherein when a transmission direction of uplink data packets is changed in the split bearer configured for the master base station and the secondary base station, the RLC layer processing unit performs re-establishment on the RLC layer for the master base station and the RLC layer for the secondary base station, and the PDCP layer processing unit performs re-establishment on the PDCP layer.

Method and apparatus for security-risk based admission control

Abstract: A method and apparatus is disclosed herein for security risk-based admission control In one embodiment, the method comprises: receiving a request from the user device to access the network; determining whether to admit the user device based on a security-based admission control policy that admits user devices based on a constraint optimization that attempts to maximize the sum utility of the currently admitted user devices in view of a security assessment of the user device and security risk imposed on the network and already admitted user devices if the user device is admitted to the network, wherein the constraint optimization is based on a utility associated with admitting the user device to the network, a reputation value associated with the user device, and a botnet damage estimation on the network associated with the user device; and admitting the user device to the network based on results of determining whether to admit the user device

Base station and method

Abstract: A base station includes a determination unit that determines whether user equipment performs radio communication through a booster, based on delay time of a signal transmitted to and received from the user equipment; a target SIR setting unit that sets a target SIR to be compared to a received SIR for performing transmission power control based on the received SIR of an uplink signal from the user equipment; a transmission power control signal generating unit that generates, based on the target SIR and the received SIR, a transmission power control signal to be set for controlling transmission power of the user equipment; and a transmitter that transmits the transmission power control signal to the user equipment. When determination is made that the radio communication is performed through the booster, the target SIR is set to be less than or equal to a predetermined upper limit value.

Transmission device and transmission method

Abstract: A disclosed OFDM-based transmission device includes a unicast channel generating unit configured to generate a unicast channel; an MBMS channel generating unit configured to generate an MBMS channel; a multiplexing unit configured to time-division-multiplex the unicast channel and the MBMS channel in the same frequency band; and a transmitting unit configured to transmit time-division-multiplexed transmission symbols In the disclosed transmission device, the guard interval length for the MBMS channel is set longer than the guard interval length for the unicast channel