Mitsubishi Electric Corporation

Yasuhiro Onaka

Mitsuru Mochizuki

Miho Maeda

Taisei Suemitsu

Noriyuki Fukui

Futoshi Katada

Yozo Fukuda

Masatoshi Nakayama

Kazuhisa Yamauchi

Tomokazu Hamada

Satoru Ishizaka

A communication system includes a base station configuring an energy saving cell (ES cell) and a base station configuring a compensation cell (Comp cell). The ES cell is switchable between a switch-on state and a switch-off state. The Comp cell compensates for the coverage of the ES cell when the ES cell is in the switch-off state. Before the Comp cell starts compensating for the coverage, for example, before the ES cell decides to switch itself off in Step ST, in Step STfor example, the base station configuring the ES cell notifies the UE being connected with the ES cell of the information about a Comp cell, for example, a Comp cell list.

Communication system and base station

Communication system, base station and communication terminal

Communication system

In a communication system of the present invention, a HeNB measures interference in Step STin an energy saving mode. When judging to have detected the interference by a UE during communication with an eNB in Step ST, the HeNB cancels the energy saving mode and moves to a normal mode in Step STand starts issuing a pilot signal in Step ST. When the UE judges to have detected the pilot signal in Step STand reports the judgment results to the eNB in Step ST, in Steps STto ST, a handover process from the eNB to the HeNB is performed for the UE.

In a communication system, a HeNB measures interference in an energy saving mode. When judging to have detected the interference by a UE during communication with an eNB, the HeNB cancels the energy saving mode and moves to a normal mode and starts issuing a pilot signal. When the UE judges to have detected the pilot signal and reports the judgment results to the eNB, a handover process from the eNB to the HeNB is performed for the UE.

A directional coupler capable of improving a directionality of a directional coupler body including four terminals. The directional coupler includes a directional coupler body including the four terminals of an input port, an output port, a coupling port, and an isolation port; and a combiner for combining powers of an output signal of the coupling port and an output signal of the isolation port of the directional coupler body; and a directionality improving circuit for amplifying or attenuating at least one of the output signal of the coupling port and the output signal of the isolation port before outputting the same, and the combiner combines powers of the output signals amplified or attenuated by the directionality improving circuit.

Directional coupler

Growing community of inventors

Tokyo, Japan

Yasuhiro Onaka