Abstract: Provided is a communication system that can be normally and efficiently operated in the case where existing carriers and new carrier types coexist. A base station device and a communication terminal device are configured to perform communication in cells of legacy carriers LC1 to LC3 being existing carriers. When the base station device starts operating new carrier types NCT1 and NCT2, the NCT1 and NCT2 are associated with legacy carriers belonging to the same frequency band. For example, the NCT2 is associated with the LC2 or the LC3 and is not associated with the LC1. The legacy carriers LC1 to LC3 associated with the NCT1 and the NCT2 notify the communication terminal device of the information on the NCT1 and NCT2. This allows the communication terminal device to communicate with the NCT1 and the NCT2.

Abstract: A radio communication technology that can achieve low latency, high reliability, and low jitter characteristics. A transmitter is configured to duplicate a packet and transmit the duplicated packets. The receiver is configured to receive the duplicated packets. The receiver is configured to transfer, to an upper layer in the receiver, a first packet that is a packet received earlier out of the duplicated packets. A transfer timing that is a timing with which the first packet is transferred to the upper layer includes at least one of: a reception timing of a second packet that is a packet received later than the first packet out of the duplicated packets; and a cyclical timing (Cycle time) corresponding to a transmission cycle of the duplicated packets.

Abstract: 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.

Abstract: A base station includes a reception processing unit that receives a signal for use in positioning transmitted from a terminal device, and a positioning processing unit that computes the location of the terminal device using the signal for use in positioning.

Abstract: A high-speed communication system etc. are provided in New Radio (NR) and LTE. When a secondary base station device detects a data inactive state for all bearers, the secondary base station device notifies a master base station device of occurrence of the data inactive state regardless of absence of an inquiry from the master base station device. The data inactive state is a state in which downlink data for a communication terminal device is inactive. When the master base station device receives the notification about the occurrence of the data inactive state, the master base station device transmits a command to the communication terminal device to transition from an RRC_CONNECTED state to an RRC_INACTIVE state. Based on the command from the master base station device, the communication terminal device transitions to the RRC_INACTIVE state.

Abstract: Provided is a high-speed communication system with the high reliability and the low latency under New Radio (NR). A base station device includes a plurality of distributed units (DU) that transmit and receive radio signals, and a central unit (CU) that controls the plurality of DUs. The CU duplicates a downlink packet addressed to a communication terminal device, and forwards the duplicated downlink packet to each of at least two DUs among the plurality of DUs. Each of the at least two of the DUs transmits, to the communication terminal device by the radio signal, the downlink packet obtained from the CU. Upon redundant receipt of the downlink packets, the communication terminal device removes a redundant downlink packet in accordance with a predefined downlink packet removal criterion.

Abstract: A tracing apparatus that is connected to a PLC for inputting and outputting signals based on a ladder program includes: a ladder program analysis unit that analyzes an order in which nets in the ladder program are arranged so as to produce an execution order signal table indicating an order in which the nets are executed; a trace target setting unit that sets one or more nets to be traced; a trace data acquisition unit that acquires trace data in a predetermined sampling cycle; a compensation determination unit that determines, based on the table, whether or not the state (reference signal) of a signal at a contact included in a ladder circuit to be traced needs to be compensated for; and an output unit that outputs a ladder diagram of a trace result which has been compensated for based on the result of the determination of the compensation determination unit.

Abstract: A centerline for generating network data of an indoor space can be generated while limiting the amount of calculation. Points where first straight lines and second straight lines constituting centerlines meet are created using re-entrant vertices (Step 1). The points created in Step 1 are connected by lines (Step 2). Connection lines corresponding to the longest sides are repeatedly deleted from closed polygons defined by the connection lines obtained in Step 2 until no closed polygons are left (Step 3). Each vertex of the connection lines obtained in Step 3 is connected to a farthest center point on the perimeter of the shape of the passage if there is such a farthest center point to which the vertex can be connected without touching the perimeter and without crossing other connection lines (Step 4).

Abstract: Centerlines for generating network data of an indoor space can be simplified while the amount of calculation is limited. A centerline simplification unit 240 performs processing of deleting centerlines of passages that are movable regions in an indoor space and processing of correcting centerlines. A determination unit 242 determines whether or not the simplification has ended based on the number of centerlines or the number of vertices connecting the centerlines.

Abstract: Provided is a communication system with low latency and high reliability, etc. Even after transitioning from RRC_CONNECTED to RRC_INACTIVE, a communication terminal device maintains secondary base station configuration information on configuring a secondary base station Even when at least one of a master base station and a secondary base station is changed during the RRC_INACTIVE, the communication terminal device maintains the secondary base station configuration information. The communication terminal device again transitions to the RRC_CONNECTED using the maintained secondary base station configuration information.

Abstract: A signal is transmitted and received between a base station device and a communication terminal device that are included in a communication system, through a multi-element antenna including a plurality of antenna elements. At least one of the base station device and the communication terminal device includes a PHY processing unit that is a calibration unit that performs calibration of phases and amplitudes of beams formed by the antenna elements when the signal is transmitted and received. The PHY processing unit obtains a correction value for the phases and the amplitudes of the beams in the respective antenna elements so that the phases and the amplitudes of the beams are identical among the antenna elements, and performs the calibration based on the obtained correction value.

Abstract: Provided is a high-speed communication system with high reliability and low latency, etc., under New Radio (NR). A communication system includes a communication terminal device, and a base station device configured to perform radio communication with the communication terminal device. The communication terminal device is configured to duplicate a packet and transmit the duplicated packets with carrier aggregation. The base station device is configured to transmit, to the communication terminal device, packet duplication control on packet duplication and secondary cell control on a secondary cell to be used for the carrier aggregation. The communication terminal device is configured to perform the packet duplication control and the secondary cell control based on priorities defined between the packet duplication control and the secondary cell control.

Abstract: A communication system that can reduce latency while preventing reduction in a transmission rate. An eNB communicates with a UE #1 using a self-contained subframe including a first downlink signal (DL #1) and a first uplink signal (UL #1), and with a UE #2 using a self-contained subframe including a second downlink signal (DL #2) and a second uplink signal (UL #2). The self-contained subframe for the UE #1 includes a first gap duration (Gap #1) during which neither the DL #1 nor the UL #1 is transmitted, between transmission durations of the DL #1 and the UL #1. The self-contained subframe for the UE #2 includes a second gap duration (Gap #2) during which neither the DL #2 nor the UL #2 is transmitted, between transmission durations of the DL #2 and the UL #2. The Gaps #1 and #2 are set to each UE.

Abstract: A radio communication technology with small delay is provided. A communication system includes a communication terminal and a base station. The base station includes a plurality of transmitter-receivers configured to perform radio communication with the communication terminal. The base station is configured to perform radio communication with the communication terminal by using a part or all of the plurality of transmitter-receivers. The communication terminal receives a downlink synchronization signal from at least one transmitter-receiver to be newly connected, and establishes downlink synchronization with the at least one transmitter-receiver by using the downlink synchronization signal. The communication terminal receives a random access start order from the base station, performs random access processing by using the random access start order, and establishes uplink synchronization with the at least one transmitter-receiver.

Abstract: A wireless communication system includes a mobile terminal, multiple lower-layer base stations communicating with the mobile terminal, and an upper-layer base station controlling the lower-layer base stations. The upper-layer base station transmits, to the lower-layer base stations, multiple pieces of first data generated by duplication by the upper-layer base station, and the lower-layer base stations transmit the first data to the mobile terminal. The mobile terminal includes link control units receiving the respective first data correspondingly to the respective lower-layer base stations; and a data control unit that, when a first link control unit of the link control units receives the first data from a first lower-layer base station of the lower-layer base stations, transmits a retransmission request stop message to a second link control unit that hasn't received the first data from a second lower-layer base station being a lower-layer base station other than the first lower-layer base station.

Abstract: A signal is transmitted and received between a base station device and a communication terminal device that are included in a communication system, through a multi-element antenna including a plurality of antenna elements. At least one of the base station device and the communication terminal device includes a PHY processing unit that is a calibration unit that performs calibration of phases and amplitudes of beams formed by the antenna elements when the signal is transmitted and received. The PHY processing unit obtains a correction value for the phases and the amplitudes of the beams in the respective antenna elements so that the phases and the amplitudes of the beams are identical among the antenna elements, and performs the calibration based on the obtained correction value.

Abstract: A communication system is provided that can improve the communication capability of a communication terminal device in the case where a large number of small cells in addition to a macro cell are installed and operated. A communication terminal device (UE) is connected with a macro cell configured by a MeNB and a small cell configured by a SeNB, so that dual connectivity is performed. When receiving information for small cells, for example, emergency information from a CBC via an MME, at least one cell of the macro cell and the small cell notifies the communication terminal device connected with the at least one cell of the information for small cells.

Abstract: A communication system capable of preventing unnecessary switching of an energy saving cell between a normal operation state and an energy saving state. An energy saving cell (ES cell) is in a dormant state that is the energy saving state. In this case, when being notified of a wake-up request message from a communication terminal device (UE), the ES cell executes access restriction control to judge whether the UE can access its own cell. If judging that the UE can access its own cell, the ES cell switches on its own cell and shifts from the dormant state to an active state that is the normal operation state.

Abstract: Provided is a high-speed communication system with high reliability and low latency, etc., under New Radio (NR). A communication system includes a communication terminal device, and a base station device configured to perform radio communication with the communication terminal device. The communication terminal device is configured to duplicate a packet and transmit the duplicated packets with carrier aggregation. The base station device is configured to transmit, to the communication terminal device, packet duplication control on packet duplication and secondary cell control on a secondary cell to be used for the carrier aggregation. The communication terminal device is configured to perform the packet duplication control and the secondary cell control based on priorities defined between the packet duplication control and the secondary cell control.

Abstract: A communication system that can reduce latency while preventing reduction in a transmission rate. An eNB communicates with a UE #1 using a self-contained subframe including a first downlink signal (DL #1) and a first uplink signal (UL #1), and with a UE #2 using a self-contained subframe including a second downlink signal (DL #2) and a second uplink signal (UL #2). The self-contained subframe for the UE #1 includes a first gap duration (Gap #1) during which neither the DL #1 nor the UL #1 is transmitted, between transmission durations of the DL #1 and the UL #1. The self-contained subframe for the UE #2 includes a second gap duration (Gap #2) during which neither the DL #2 nor the UL #2 is transmitted, between transmission durations of the DL #2 and the UL #2. The Gaps #1 and #2 are set to each UE.