Mitsubishi Electric Corporation

Takayuki Nonami

Mitsuru Mochizuki

Miho Maeda

Yasushi Iwane

Taisei Suemitsu

Yuichi Nakai

Koji Ono

Masayuki Nakazawa

Kuniyuki Suzuki

Naohito Tomoe

Fumiki Hasegawa

Fusako Takayanagi

Etsuko Hokan

A communication system includes a communication terminal device, a base station device performing radio communication with the communication terminal device, and a base station controller controlling the base station device. The communication terminal device is a machine type communication (MTC) device, The base station controller includes a mobility management entity (MME). Data is transmitted to the MME from the communication terminal device via the base station device.

Communication system

The present invention has an object to provide a communication system capable of avoiding congestion in downlink communication or uplink communication and a shortage of radio resources arising therefrom. In the present invention, in a communication system including a normal user equipment (normal UE) that performs human to human communication and a machine type communication device (MTCD) that performs machine to machine communication, a base station device transmits a paging message to the normal UE and the MTCD for calling the normal UE and the MTCD. The paging message contains, for example, an equipment identity (UE-ID). A maximum number of equipment identities (UE-IDs) that can be accommodated within this paging message is set individually for the normal UE and the MTCD. Alternatively, the paging message contains a calling indicator in place of the equipment identity of the MTCD (UE-ID of MTCD).

Mobile communication system, base station, communication terminal device and MTC device

Communication system, terminal device and base station for machine type communication

A cellconfigured by only a DL CCbeing a resource for downlink is configured. The celldoes not include a resource for uplink, that is, a UL CC to be associated with the DL CCby a DL/UL link. The link information indicating the above is notified a communication terminal device by a base station device using the DL CC. A DL CCand a UL CC constitute a cell. The downlink communication from the base station device to the communication terminal device is performed using the celland the cell, and the uplink communication from the communication terminal device to the base station device is performed using the cell

Communication terminal device

A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Communication system, base station, and communication terminal for controlling interference from neighboring cells

A cellconfigured by only a DL CCbeing a resource for downlink is configured. The celldoes not include a resource for uplink, that is, a UL CC to be associated with the DL CCby a DL/UL link. The link information indicating the above is notified a communication terminal device by a base station device using the DL CC. A DL CCand a UL CCconstitute a cell. The downlink communication from the base station device to the communication terminal device is performed using the celland the cell, and the uplink communication from the communication terminal device to the base station device is performed using the cell

A cell2 configured by only a DL CC2 being a resource for downlink is configured. The cell2 does not include a resource for uplink, that is, a UL CC to be associated with the DL CC2 by a DL/UL link. The link information indicating the above is notified a communication terminal device by a base station device using the DL CC2. A DL CC1 and a UL CC1 constitute a cell1. The downlink communication from the base station device to the communication terminal device is performed using the cell1 and the cell2, and the uplink communication from the communication terminal device to the base station device is performed using the cell1.

Communication system, base station and terminal device

Communication system, base station, and communication terminal

Communication system and communication terminal device using associated and non-associated cells

A communication system includes a user equipment (UE), and a plurality of cells that perform communication with the UE. The plurality of cells include a macro cell having a relatively-wide-range coverage, and a plurality of small cells having a relatively-narrow-range coverage. The plurality of small cells are connected to a concentrator. The concentrator selects the small cell to which the UE is to be connected, from among a plurality of small cells, based on the flow of at least either one of the received data that each small cell receives from the UE and the transmission data that each small cell transmits to an MME and an S-GW.

Base station device and communication system for communicating using a non-associated cell, an asymmetrical cell, a frequency band for downlink, or a frequency band for uplink

Communication system for reducing congestion

A communication system in which when judging to have received an RRC message from a communication terminal device, a base station device, for example, HeNB checks an MTCD indicator to be mapped to the received RRC message. Then, when judging that the UE that has transmitted the RRC message received is an MTCD being a device for machine type communication (MTC) from the checked MTCD indicator, the HeNB performs a concentration process on the data from the MTCD to the core network.

Growing community of inventors

Tokyo, Japan

Takayuki Nonami