Ntt Docomo, Inc.

Hiroshi Ou

Tooru Uchino

Teruaki Toeda

Anil Umesh

Akihito Hanaki

Makoto Miyagoshi

In one aspect of the present invention, a first base station for communicating with user equipment together with a second base station according to dual connectivity includes a data storage unit configured to store data to be transmitted from the first base station to the user equipment; a reception unit configured to receive from the second base station information indicating whether data to be transmitted from the second base station to the user equipment exist; and a state control unit configured to, when information indicating that data to be transmitted from the second base station to the user equipment exist is received, prevent the user equipment from releasing a radio resource or transitioning to a discontinuous reception state, even if the amount of to-be-transmitted data stored in the data storage unit is less than or equal to a predetermined threshold.

Base station and state control method

A network node in a wireless communication system comprising a user equipment and a plurality of network nodes, comprises: a reception unit for receiving from another network node or a user equipment a protocol data unit related to packet transmission that has a possibility of a plurality of data lengths with respect to sequence numbers; an acquiring unit for acquiring a sequence number of the protocol data unit related to packet transmission; and a notification unit for carrying out, based on the sequence number as acquired, notification related to packet transmission.

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Tokyo, Japan

Hiroshi Ou