JP2020077989A - Communication system - Google Patents

Abstract

To provide a communication system capable of stable communication.SOLUTION: The communication system includes: a base station 503: and terminal stations 504, 505, 506 communicatively connected to the base station 503. The base station 503 and the terminal stations 504, 505, 506 are connected to each other by wireless communication and wired communication. The base station 503 transmits the same data to the terminal stations 504, 505, 506 by wireless communication and wired communication. The terminal stations 504, 505, 506 select either one of the data received from the base station 503 by wireless communication and wired communication.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a communication system for performing wireless communication between a communication terminal device such as a mobile terminal device and a base station device.

  In the 3rd Generation Partnership Project (3GPP), which is a standardization organization for mobile communication systems, a wireless section is referred to as a long term evolution (LTE), and a core network and a wireless access network (hereinafter collectively referred to as a network). Regarding the overall configuration of the system including (referred to as), a communication method called System Architecture Evolution (SAE) is under study (for example, Non-Patent Documents 1 to 4). This communication system is also called a 3.9G (3.9 Generation) system.

  As an LTE access method, OFDM (Orthogonal Frequency Division Multiplexing) is used in the downlink direction and SC-FDMA (Single Carrier Frequency Division Multiple Access) is used in the uplink direction. Unlike W-CDMA (Wideband Code Division Multiple Access), LTE does not include circuit switching and is only a packet communication system.

  Non-Patent Document 1 (Chapter 5) describes the decision items regarding the frame configuration in the LTE system in 3GPP, with reference to FIG. FIG. 1 is an explanatory diagram showing a configuration of a radio frame used in an LTE communication system. In FIG. 1, one radio frame (Radio frame) is 10 ms. The radio frame is divided into 10 equal-sized subframes. A subframe is divided into two equal-sized slots. A downlink synchronization signal is included in the first and sixth subframes of each radio frame. The synchronization signals include a first synchronization signal (Primary Synchronization Signal: P-SS) and a second synchronization signal (Secondary Synchronization Signal: S-SS).

  Non-Patent Document 1 (Chapter 5) describes the decision items regarding the channel configuration in the LTE system in 3GPP. It is assumed that a CSG (Closed Subscriber Group) cell also uses the same channel configuration as a non-CSG cell.

  A physical broadcast channel (PBCH) is from a base station device (hereinafter may be simply referred to as “base station”) to a mobile terminal device (hereinafter may be simply referred to as “mobile terminal” or “terminal station”). Is a channel for downlink transmission to a communication terminal device (hereinafter, may be simply referred to as “communication terminal” or “terminal station”). The BCH transport block is mapped to 4 subframes in a 40 ms interval. There is no explicit signaling of 40 ms timing.

  A physical control format indicator channel (PCFICH) is a channel for downlink transmission from a base station to a communication terminal. The PCFICH notifies the communication terminal of the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols used for PDCCHs from the base station. PCFICH is transmitted for each subframe.

  A physical downlink control channel (PDCCH) is a channel for downlink transmission from a base station to a communication terminal. The PDCCH is resource allocation information of a downlink shared channel (DL-SCH), which is one of the transport channels described below, and a paging channel (PCH), which is one of the transport channels described below. ) Resource allocation information and HARQ (Hybrid Automatic Repeat reQuest) information on the DL-SCH. The PDCCH carries an Uplink Scheduling Grant. The PDCCH carries Ack (Acknowledgement) / Nack (Negative Acknowledgment) which is a response signal to the uplink transmission. The PDCCH is also called an L1 / L2 control signal.

  A physical downlink shared channel (PDSCH) is a channel for downlink transmission from a base station to a communication terminal. A downlink shared channel (DL-SCH) that is a transport channel and a PCH that is a transport channel are mapped to the PDSCH.

  A physical multicast channel (Physical Multicast Channel: PMCH) is a channel for downlink transmission from a base station to a communication terminal. A multicast channel (Multicast Channel: MCH) that is a transport channel is mapped to the PMCH.

  The physical uplink control channel (Physical Uplink Control Channel: PUCCH) is a channel for uplink transmission from a communication terminal to a base station. The PUCCH carries Ack / Nack, which is a response signal for downlink transmission. PUCCH carries a CQI (Channel Quality Indicator) report. The CQI is quality information indicating the quality of received data or communication channel quality. Further, the PUCCH carries a scheduling request (SR).

  The Physical Uplink Shared Channel (PUSCH) is a channel for uplink transmission from a communication terminal to a base station. An uplink shared channel (UL-SCH), which is one of the transport channels, is mapped to the PUSCH.

  A physical HARQ indicator channel (Physical Hybrid ARQ Indicator Channel: PHICH) is a channel for downlink transmission from a base station to a communication terminal. The PHICH carries Ack / Nack which is a response signal for upstream transmission. The Physical Random Access Channel (PRACH) is a channel for uplink transmission from a communication terminal to a base station. The PRACH carries a random access preamble.

  The downlink reference signal (Reference Signal: RS) is a symbol known as an LTE communication system. The following five types of downlink reference signals are defined. Reference signal for data demodulation (Demodulation Reference Signal: DM-RS) which is a cell-specific reference signal (CRS), an MBSFN reference signal (MBSFN Reference Signal), and a mobile terminal specific reference signal (UE-specific Reference Signal). ), A position determination reference signal (PRS), and a channel state information reference signal (CSI-RS). Measurement of the physical layer of a communication terminal includes measurement of reference signal received power (RSRP).

  The transport channel described in Non-Patent Document 1 (Chapter 5) will be described. Of the downlink transport channels, a broadcast channel (BCH) is broadcast to the entire coverage of the base station (cell). The BCH is mapped to the physical broadcast channel (PBCH).

  Retransmission control by HARQ (Hybrid ARQ) is applied to the downlink shared channel (DL-SCH). The DL-SCH can notify the entire coverage of the base station (cell). DL-SCH supports dynamic or semi-static resource allocation. Quasi-static resource allocation is also called Persistent Scheduling. DL-SCH supports discontinuous reception (DRX) of a communication terminal in order to reduce the power consumption of the communication terminal. DL-SCH is mapped to a physical downlink shared channel (PDSCH).

  The paging channel (Paging Channel: PCH) supports DRX of a communication terminal in order to enable low power consumption of the communication terminal. The PCH is required to be notified to the entire coverage of the base station (cell). The PCH is dynamically mapped to a physical resource such as a physical downlink shared channel (PDSCH) that can be used for traffic.

  A multicast channel (Multicast Channel: MCH) is used for notification to the entire coverage of a base station (cell). The MCH supports SFN combining of MBMS (Multimedia Broadcast Multicast Service) services (MTCH and MCCH) in multi-cell transmission. MCH supports quasi-static resource allocation. MCH is mapped to PMCH.

  Of the uplink transport channels, retransmission control by HARQ (Hybrid ARQ) is applied to the uplink shared channel (UL-SCH). UL-SCH supports dynamic or semi-static resource allocation. UL-SCH is mapped to a physical uplink shared channel (PUSCH).

  The Random Access Channel (RACH) is limited to control information. RACH is at risk of collision. The RACH is mapped to the physical random access channel (PRACH).

  HARQ will be described. HARQ is a technique for improving the communication quality of a transmission line by combining automatic repeat request (ARQ) and error correction (Forward Error Correction). HARQ has an advantage that error correction effectively functions by retransmission even for a transmission line whose communication quality changes. In particular, it is possible to further improve the quality by combining the reception result of the initial transmission and the reception result of the retransmission in the retransmission.

  An example of the retransmission method will be described. When the receiving side cannot correctly decode the received data, in other words, when a CRC (Cyclic Redundancy Check) error occurs (CRC = NG), the receiving side transmits “Nack” to the transmitting side. The transmission side that receives the “Nack” retransmits the data. When the reception side can correctly decode the received data, in other words, when no CRC error occurs (CRC = OK), the reception side transmits “Ack” to the transmission side. The transmission side which has received "Ack" transmits the next data.

  The logical channel (logical channel) described in Non-Patent Document 1 (Chapter 6) will be described. Broadcast control channel (BCCH) is a downlink channel for broadcast system control information. BCCH which is a logical channel is mapped to a broadcast channel (BCH) which is a transport channel or a downlink shared channel (DL-SCH).

  A paging control channel (PCCH) is a downlink channel for transmitting changes in paging information (Paging Information) and system information (System Information). The PCCH is used when the network does not know the cell location of the communication terminal. The PCCH, which is a logical channel, is mapped to the paging channel (PCH), which is a transport channel.

  The common control channel (Common Control Channel: CCCH) is a channel for transmission control information between a communication terminal and a base station. CCCH is used when the communication terminal does not have an RRC connection with the network. In the downlink direction, the CCCH is mapped to the downlink shared channel (DL-SCH) which is a transport channel. In the uplink direction, the CCCH is mapped to an uplink shared channel (UL-SCH) which is a transport channel.

  The Multicast Control Channel (MCCH) is a downlink channel for one-to-many transmission. The MCCH is used for transmission of MBMS control information for one or several MTCHs from the network to the communication terminal. The MCCH is used only for communication terminals that are receiving MBMS. The MCCH is mapped to a multicast channel (MCH) which is a transport channel.

  The dedicated control channel (DCCH) is a channel for transmitting dedicated control information between the communication terminal and the network on a one-to-one basis. The DCCH is used when the communication terminal has an RRC connection. The DCCH is mapped to the uplink shared channel (UL-SCH) in the uplink and is mapped to the downlink shared channel (DL-SCH) in the downlink.

  The dedicated traffic channel (Dedicated Traffic Channel: DTCH) is a channel for one-to-one communication to an individual communication terminal for transmitting user information. DTCH exists in both uplink and downlink. The DTCH is mapped to the uplink shared channel (UL-SCH) in the uplink and is mapped to the downlink shared channel (DL-SCH) in the downlink.

  A multicast traffic channel (Multicast Traffic channel: MTCH) is a downlink channel for transmitting traffic data from a network to a communication terminal. MTCH is a channel used only for communication terminals receiving MBMS. MTCH is mapped to a multicast channel (MCH).

  CGI is a Cell Global Identifier. ECGI is an E-UTRAN Cell Global Identifier. In LTE, LTE-A (Long Term Evolution Advanced) and UMTS (Universal Mobile Telecommunication System), which will be described later, a CSG (Closed Subscriber Group) cell is introduced.

  A CSG (Closed Subscriber Group) cell is a cell in which an operator identifies available subscribers (hereinafter sometimes referred to as a "cell for a specific subscriber"). The identified subscriber is allowed to access one or more cells of the PLMN (Public Land Mobile Network). One or more cells to which the identified subscriber is permitted access are called "CSG cells (CSG cell (s))". However, the PLMN has access restrictions.

  A CSG cell is a part of PLMN which broadcasts a unique CSG identity (CSG identity) and broadcasts "TRUE" by CSG indication. The members of the subscriber group, which are registered in advance and authorized, access the CSG cell using the CSG ID which is the access permission information.

  The CSG ID is broadcast by the CSG cell or cell. There are a plurality of CSG IDs in the LTE communication system. The CSG ID is then used by the mobile terminal (UE) to facilitate access for CSG related members.

  The location tracking of the communication terminal is performed in units of an area composed of one or more cells. The position tracking is performed to track the position of the communication terminal even in the standby state and call the communication terminal, in other words, to allow the communication terminal to receive the call. The area for tracking the position of this communication terminal is called a tracking area.

  In 3GPP, base stations called Home-NodeB (Home-NB; HNB) and Home-eNodeB (Home-eNB; HeNB) are under study. The HNB in UTRAN and the HeNB in E-UTRAN are base stations for home, corporate, and commercial access services, for example. Non-Patent Document 2 discloses three different modes of access to HeNB and HNB. Specifically, the open access mode (Open access mode), the closed access mode (Closed access mode), and the hybrid access mode (Hybrid access mode) are disclosed.

  Also, in 3GPP, as Release 10, the standardization of Long Term Evolution Advanced (LTE-A) is underway (see Non-Patent Documents 3 and 4). LTE-A is based on the wireless communication system of LTE, and is configured by adding some new technologies.

  In the LTE-A system, in order to support a wider frequency bandwidth (transmission bandwidths) up to 100 MHz, two or more component carriers (Component Carriers: CCs) are aggregated (also referred to as “aggregation”). , Carrier Aggregation (CA) is under study. CA is described in Non-Patent Document 1.

  When the CA is configured, the mobile terminal has a network (NW) and only one RRC connection. In the RRC connection, one serving cell provides NAS mobility information and security input. This cell is called a primary cell (PCell). In the downlink, a carrier corresponding to PCell is a downlink primary component carrier (DL PCC). In the uplink, a carrier corresponding to PCell is an uplink primary component carrier (UL PCC).

  A secondary cell (SCell) is configured to form a set of serving cells together with a PCell according to the capability of the mobile terminal. In the downlink, the carrier corresponding to SCell is a downlink secondary component carrier (DL SCC). In the uplink, the carrier corresponding to SCell is an uplink secondary component carrier (UL SCC).

  A set of serving cells including one PCell and one or more SCells is configured for one mobile terminal.

  In addition, as a new technology in LTE-A, there are a technology (Wider bandwidth extension) that supports a wider band, a Coordinated Multiple Point transmission and reception (CoMP) technology, and the like. Non-Patent Document 1 describes CoMP being studied for LTE-A in 3GPP.

  The traffic volume of mobile networks is increasing, and the communication speed is also increasing. When LTE and LTE-A start full-scale operation, it is expected that the communication speed will be further increased.

  Further, in 3GPP, in order to cope with a huge amount of traffic in the future, it is considered to use a small eNB (hereinafter sometimes referred to as a “small base station apparatus”) that configures a small cell. For example, a technique for increasing frequency utilization efficiency and increasing communication capacity by installing a large number of small eNBs and forming a large number of small cells has been studied. Specifically, there is a dual connectivity (Dual Connectivity; abbreviated: DC) in which a mobile terminal connects to two eNBs for communication. DC is described in Non-Patent Document 1.

  Of the eNBs that perform dual connectivity (DC), one may be referred to as the “master eNB (abbreviation: MeNB)” and the other may be referred to as the “secondary eNB (abbreviation: SeNB)”.

  Further, for advanced mobile communication, a fifth generation (hereinafter sometimes referred to as “5G”) wireless access system aiming to start service after 2020 is under study. For example, in Europe, 5G requirements are summarized by an organization called METIS (see Non-Patent Document 5).

  In the 5G wireless access system, the system capacity is 1000 times, the data transmission speed is 100 times, the data processing delay is 1/10 (1/10), and the number of simultaneous connection of communication terminals is 100 times that of the LTE system. As a requirement, it is mentioned that further power consumption reduction and device cost reduction are realized.

  In order to meet such demands, it has been studied to increase the data transmission capacity by using the frequency in a wide band and increase the frequency utilization efficiency to increase the data transmission rate. In order to realize these, techniques such as MIMO (Multiple Input Multiple Output) using multiple element antennas and beam forming, which enable spatial multiplexing, are being studied.

  Further, in LTE-A, studies on MIMO are continued, and FD (Full Dimension) -MIMO using a two-dimensional antenna array is studied by Release 13 as an extension of MIMO. FD-MIMO is described in Non-Patent Document 6.

  It is considered that the 5G wireless access system will be co-located with the LTE system at the beginning of the service scheduled for 2020. By connecting the LTE base station and the 5G base station with a DC configuration, and using the LTE base station as the MeNB and the 5G base station as the SeNB, the LTE base station with a large cell range processes the C-plane data, and the LTE base station A configuration in which a 5G base station performs U-plane processing is considered.

  In addition, short-distance wireless communication in which a plurality of communication interfaces capable of transferring sound data are simultaneously connected to a mobile phone and sound data is appropriately transferred from the mobile phone via any one of the plurality of communication interfaces An apparatus is disclosed (see Patent Document 1).

JP, 2013-201767, A

3GPP TS36.300 V13.0.0 3GPP S1-083461 3GPP TR 36.814 V9.0.0 3GPP TR 36.912 V10.0.0 "Scenarios, requirements and KPIs for 5G mobile and wireless system", [online], April 30, 2013, ICT-317669-METIS / D1.1, [January 25, 2016 search], Internet <https://www.metis2020.com/documents/deliverables/> 3GPP TS36.897 V13.0.0

  For example, in a production line of a factory, in order to facilitate a layout change of the production line, it is conceivable to carry out wireless communication without using a cable. However, in the factory, there are many large metal devices, or trolleys or pulleys for movement, etc., and the reflected waves reflected by these reflectors often interfere with the signals of wireless communication. However, there is a problem in that wireless communication cannot be reliably performed due to the occurrence of a large EMI (Electromagnetic Interference) from a device in a factory, and stable communication cannot be ensured.

  The present invention has been made to solve such a problem, and an object thereof is to provide a communication system capable of ensuring stable communication.

  In order to solve the above problems, a communication system according to the present invention is a communication system including a base station and a terminal station communicatively connected to the base station, and the base station and the terminal station are wireless communication. The base station transmits the same data to the terminal station by wireless communication and wired communication, respectively, and the terminal station selects one of the data received from the base station by wireless communication and wired communication. Select either one.

  According to the present invention, a communication system is a communication system including a base station and a terminal station communicatively connected to the base station, wherein the base station and the terminal station are connected to each other by wireless communication and wired communication. , The base station transmits the same data to the terminal station by wireless communication and wired communication, and the terminal station selects one of the data received from the base station by wireless communication and wired communication. It becomes possible to secure stable communication.

It is a figure which shows an example of a structure of the communication system provided with the conventional radio | wireless communication apparatus. It is a figure which shows an example of the protocol stack in the communication system of FIG. It is a figure which shows an example of a structure of the communication system provided with the conventional wired communication apparatus. It is a figure which shows an example of the protocol stack in the communication system of FIG. It is a figure which shows an example of a structure of the communication system by Embodiment 1 of this invention. FIG. 3 is a block diagram showing an example of a configuration of a base station according to the first embodiment of the present invention. FIG. 3 is a block diagram showing an example of a configuration of a terminal station according to the first embodiment of the present invention. It is a figure which shows an example of the protocol stack in the communication system by Embodiment 1 of this invention. It is a figure which shows an example of a structure of the communication system by Embodiment 1 of this invention. It is a figure which shows an example of the data transmission by Embodiment 1 of this invention. It is a figure which shows an example of the data transmission by Embodiment 1 of this invention. It is a figure which shows an example of the data transmission by Embodiment 1 of this invention. It is a figure which shows an example of the data transmission by Embodiment 1 of this invention. FIG. 3 is a block diagram showing an example of a configuration of a base station according to the first embodiment of the present invention. It is a figure which shows an example of the protocol stack in the communication system by Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1>
First, conventional wireless communication and wired communication will be described.

<Communication system for conventional wireless communication>
It is being studied to control each FA (Factory Automation) device that constructs a production line in a factory by wireless connection. Examples of FA equipment include PLC (Programmable Logic Controller), servo equipment, and sensors. The PLC is a device that performs sequential control according to a program such as logical operation or sequential operation. The reason why wireless connection is being considered is that it is possible to reduce wiring by wireless connection, and it is possible to easily change the layout of FA devices when the type of product to be manufactured changes.

  FIG. 1 is a diagram showing an example of a configuration of a communication system including a conventional wireless communication device, and shows a case where a management room and FA devices wirelessly communicate with each other assuming a production line in a factory. In FIG. 1, a PC (Personal Computer) 101, a master station 102, and a base station 103 are provided in a management room, and FA devices are connected to the slave stations 107, 108, and 109, respectively.

  As shown in FIG. 1, the PC 101 controls, for example, the start or stop of FA devices, and monitors the operating status of all FA devices and the production volume of production. When the master station 102 is a PLC, the master station 102 transmits, as data, the next instruction to each FA device connected to each of the slave stations 107, 108, and 109. The base station 103 transmits the command received from the master station 102 to the terminal stations 104, 105 and 106 by wireless communication. The terminal stations 104, 105, 106 receive the data transmitted from the base station 103 when performing wireless communication. The slave stations 107, 108, and 109 control each FA device by using the data received from the master station 102, and also send the FA device monitoring data and the like to the terminal stations 104, 105, and 106.

Next, the flow of processing will be described. The master station 102 is a PLC. In the PLC, for example, the following processes (a) to (c) are performed based on a ladder program which is an application program created by the user in advance.
(A) The slave station 107 detects with a sensor that an object has flowed.
(B) The slave station 108 turns on the red light when detecting that an object has flowed.
(C) The slave station 109 grasps the flowed-in object by the arm robot and conveys the object to the conveyor selected according to the conditions. Here, the condition is the size (large, medium, small) of the product that is a product. For example, when the product size is “large”, it is transported to the conveyor A, when the product size is “medium”, it is transported to the conveyor B, and when the product size is “small”, it is transported to the conveyor C. It

  First, the master station 102 transmits a CPU (Central Processing Unit) instruction based on a ladder program to the base station 103. The base station 103 that has received the instruction from the CPU transmits instruction data based on a ladder program for executing the FA device to each terminal station 104, 105, 106. As an instruction based on the ladder program, the base station 103 first transmits instruction data to the terminal station 104. Upon receiving the instruction data from the base station 103, the terminal station 104 transmits the instruction data to the slave station 107. Here, the instruction included in the instruction data is an instruction to execute the process of “notify when the sensor is asserted”. When the sensor detects that an object has flowed, the slave station 107 transmits assert information, which is information indicating the detection, to the terminal station 104. The terminal station 104 transmits the assertion information to the base station 103. The base station 103 transmits the received assertion information to the master station 102. In the master station 102, when the CPU recognizes the assertion information received from the slave station 107, it issues an instruction to the slave station 108 to perform the next process based on the ladder program. That is, the master station 102 transmits instruction data based on the ladder program to the base station 103.

  The base station 103 transmits instruction data based on the following ladder program to the terminal station 105. Upon receiving the instruction data from the base station 103, the terminal station 105 transmits the instruction data to the slave station 108. Here, the instruction included in the instruction data is an instruction to execute the process of “turning on the red light”. The slave station 108 that has received the instruction turns on the red light.

  After transmitting the instruction data for turning on the red light to the slave station 108, the master station 102 transmits the instruction data based on the next ladder program to the base station 103. The base station 103 transmits the instruction data to the terminal station 106. Upon receiving the instruction data from the base station 103, the terminal station 106 transmits the instruction data to the slave station 109. Here, the instruction included in the instruction data is a process of "determining the size of the flowed object and allocating it to the conveyor A if" large ", to the conveyor B if" medium ", and to the conveyor C if" small "". This is an instruction to execute. The slave station 109 that has received the instruction grasps the incoming matter with the arm robot and conveys the article to the conveyor according to the previously designated condition.

  Next, the flow of processing described above will be described using the example of the protocol stack in FIG.

  As shown in FIG. 2, the application layers 201 and 206 represent protocols such as an FA control switch or an instruction from the master station 102 such as a ladder program. The transport layers 202 and 207 are, for example, TCP or UDP, and provide a mechanism for transmitting by distinguishing where to communicate with a port number, or realizing highly reliable transmission by confirming delivery of data. The IP, which is the network layer 203, 208, addresses the destination of the data by the IP address.

  The link layers 204 and 209 are interfaces for passing data between, for example, 3GPP-compliant wireless communication protocols. In the example of FIG. 2, a 3GPP-compliant protocol is shown, but GSM (Global System for Mobile Communications) (registered trademark, the same applies hereinafter), Bluetooth (registered trademark, the same applies below), IEEE802.11a / b / g / n. It may be a wireless LAN-compliant one such as / ac / ad. The physical layers 205 and 210 perform CRC addition, error correction, multi-level modulation such as 64QAM, processing such as OFDM / CDM, frequency conversion to a radio frequency, and radiation from an antenna.

  Next, the data flow in the protocol stack of FIG. 2 will be described. In FIG. 2, the left protocol stack corresponds to the base station 103, and the right protocol stack corresponds to the terminal stations 104, 105 and 106.

  In the application layer 201, for example, an operator who manages a production line issues an instruction to each FA device using a ladder program. TCP / UDP, which is the transport layer 202, receives a transmission request from the application layer 201, which is an upper layer. The transport layer 202 performs error detection, error correction, retransmission control, and the like. The IP that is the network layer 203 has functions of assigning an address to a network, managing and selecting a data transmission path, transmitting and receiving data, and priority control. When the data is sent from the transport layer 202, the network layer 203 sends the data to the link layer 204. The PDCP / RLC / MAC, which is the link layer 204, identifies and recognizes the communication partner. After that, when data is sent to the physical layer 205, the physical layer 205 enables transmission / reception of a digital signal using a wireless signal. As a result, data is wirelessly transmitted from the base station 103.

  The data transmitted from the base station 103 is received by the antennas provided in the terminal stations 104, 105, 106 and reaches the physical layer 210. In the physical layer 210, a data / signal conversion method, a signal modulation / demodulation method, and the like are defined. Upon receiving the data sent from the physical layer 210, the PDCP / RLC / MAC which is the link layer 209 identifies and recognizes the communication partner. Upon receiving the data sent from the link layer 209, the IP that is the network layer 208 performs address allocation to the network, management and selection of a data transmission path, data transmission / reception, and priority control. TCP / UDP, which is the transport layer 207, receives a transmission request from the application layer 201, which is an upper layer.

  The performance of the wireless communication described above is greatly affected by the communication environment. In particular, a reflected wave reflected by a reflector such as a device in a building often interferes with a signal of wireless communication, and it may be blocked by an obstacle to ensure a sufficient SN ratio. In addition, when the layout of the production line is changed, if the installation location of the FA device is changed, the performance of wireless communication may be deteriorated each time.

<Communication system for conventional wired communication>
FIG. 3 is a diagram showing an example of a configuration of a communication system including a conventional wired communication device, and shows a case where a management room and FA devices perform wired communication assuming a production line in a factory. In FIG. 3, a PC 301, a master station 302, and a base station 303 are provided in a management room, and FA devices are connected to the slave stations 307, 308, and 309, respectively.

  As shown in FIG. 3, the PC 301 controls, for example, the start or stop of FA devices, and monitors the operating status of all FA devices and the production volume of production. When the master station 302 is a PLC, the master station 302 transmits, as data, the next instruction to each FA device connected to each of the slave stations 307, 308, 309. The base station 303 transmits the command received from the master station 302 to the terminal stations 304, 305, 306 by wireless communication. The terminal stations 304, 305, 306 receive the data transmitted from the base station 303 when performing wireless communication. The slave stations 307, 308, 309 control each FA device by using the data received from the master station 302, and also send the FA device monitoring data and the like to the terminal stations 304, 305, 306. The switching hub 310 has a function of analyzing a destination or the like and transmitting data to a necessary device.

Next, the flow of processing will be described. The master station 302 is a PLC. In the PLC, for example, the following processes (a) to (c) are performed based on a ladder program which is an application program created by the user in advance.
(A) The slave station 307 detects with a sensor that an object has flowed.
(B) The slave station 308 turns on the red light when detecting that an object has flowed.
(C) The slave station 309 grasps the flowed-in object by the arm robot and conveys the object to the conveyor selected according to the conditions. Here, the condition is the size (large, medium, small) of the product that is a product. For example, when the product size is “large”, it is transported to the conveyor A, when the product size is “medium”, it is transported to the conveyor B, and when the product size is “small”, it is transported to the conveyor C. It

  First, the master station 302 transmits a CPU instruction based on the ladder program to the base station 303. The base station 303 that has received the instruction from the CPU transmits instruction data based on a ladder program for executing the FA device to each terminal station 304, 305, 306 by wire communication via the switching hub 310. As an instruction based on the ladder program, the base station 303 first transmits instruction data to the terminal station 304. Upon receiving the instruction data from the base station 303 by wire communication via the switching hub 310, the terminal station 304 transmits the instruction data to the slave station 307. Here, the instruction included in the instruction data is an instruction to execute the process of “notify when the sensor is asserted”. When the sensor detects that an object has flowed, the slave station 307 transmits assert information, which is information indicating the detection, to the terminal station 304. The terminal station 304 transmits the assertion information to the base station 303 by wire communication via the switching hub 310. The base station 303 transmits the received assertion information to the master station 302. In the master station 302, when the CPU recognizes the assertion information received from the slave station 307, it issues an instruction to the slave station 308 to perform the next process based on the ladder program. That is, the master station 302 transmits instruction data based on the ladder program to the base station 303.

  The base station 303 transmits instruction data based on the following ladder program to the terminal station 305 by wire communication via the switching hub 310. Upon receiving the instruction data from the base station 303, the terminal station 305 transmits the instruction data to the slave station 308. Here, the instruction included in the instruction data is an instruction to execute the process of “turning on the red light”. The slave station 308 that has received the instruction turns on the red light.

  After transmitting the instruction data for turning on the red light to the slave station 308, the master station 302 transmits the instruction data based on the next ladder program to the base station 303. The base station 303 transmits the instruction data to the terminal station 306 by wire communication via the switching hub 310. Upon receiving the instruction data from the base station 303, the terminal station 306 transmits the instruction data to the slave station 309. Here, the instruction included in the instruction data is a process of "determining the size of the flowed object and allocating it to the conveyor A if" large ", to the conveyor B if" medium ", and to the conveyor C if" small "". This is an instruction to execute. The slave station 309 that has received the instruction grasps the incoming matter with the arm robot and conveys the article to the conveyor according to the previously instructed condition.

  Next, the flow of processing described above will be described using the example of the protocol stack in FIG.

  As shown in FIG. 4, the application layers 401 and 406 indicate a protocol such as an FA control switch or an instruction from the master station 302 such as a ladder program. The transport layers 402 and 407 are, for example, TCP or UDP, and provide a mechanism for transmitting by distinguishing where to communicate with a port number, or realizing highly reliable transmission by confirming delivery of data. The IP, which is the network layer 403, 408, addresses the destination of the data by the IP address.

  The link layers 404 and 409 are, for example, Ethernet (registered trademark, the same applies below), and are interfaces for passing data between protocols. In the example of FIG. 4, the Ethernet protocol is shown, but HDLC (High-Level Data Link Control) or FDDI (Fiber Distributed Data Interface) may be used. The physical layers 405 and 410 indicate protocols of electric signals or optical signals.

  Next, the data flow in the protocol stack of FIG. 4 will be described. In FIG. 4, the left side protocol stack corresponds to the base station 303, and the right side protocol stack corresponds to the terminal stations 304, 305, and 306.

  At the time of communication, data is passed from the application layer 401 to the transport layer 402, TCP / UDP, to the network layer 403, IP. Thereafter, the data is sequentially passed to the link layer 404, the Ethernet, and the physical layer 405, and the data is transmitted from the base station 303 by wire communication.

  Data received by the terminal stations 304, 305, and 306 by wire communication via the switching hub 310 are the physical layer 410, the link layer 409, Ethernet, the network layer 408, IP, and the transport layer 407, TCP. / UDP, and is passed to the slave stations 307, 308, 309.

  When data is transmitted from the slave stations 307, 308, 309 side to the master station 302 side, communication is performed via a route reverse to the above.

  Wired communication described above has more wiring than wireless communication. Further, when the type of product to be manufactured changes, the FA device layout changes, and the wiring between the networks of each device becomes complicated, resulting in erroneous connection and the like.

  The present embodiment has been made to solve the problems described above, and will be described in detail below.

<Communication system according to the first embodiment>
The first embodiment will explain a case where data transmission / reception between a base station and a terminal station is performed by both wireless communication and wired communication.

  FIG. 5 is a diagram showing an example of the configuration of the communication system according to the first embodiment of the present invention, and shows a case where the management room and the FA device wirelessly communicate with each other assuming a production line in a factory. In FIG. 5, a PC 501, a master station 502, and a base station 503 are provided in a management room, and FA devices are connected to the slave stations 507, 508, and 509, respectively.

  As shown in FIG. 5, the PC 501 controls the start or stop of FA devices, for example, and monitors the operating status of all FA devices and the production volume of production. When the master station 502 is a PLC, the master station 502 transmits, as data, the next instruction to each FA device connected to each of the slave stations 507, 508, 509. The base station 503 transmits the command received from the master station 502 to the terminal stations 504, 505, 506 by wireless communication and wired communication. The terminal stations 504, 505, 506 receive data transmitted from the base station 503 when performing wireless communication and wired communication, or transmit data received from the slave stations 507, 508, 509. The slave stations 507, 508, and 509 control each FA device using the data received from the master station 502, and also transmit the FA device monitoring data and the like to the terminal stations 504, 505, and 506. The switching hub 510 has a function of analyzing a destination or the like and transmitting data to a necessary device.

Next, the flow of processing in the communication system of FIG. 5 will be described. The master station 502 is a PLC. In the PLC, for example, the following processes (a) to (c) are performed based on a ladder program which is an application program created by the user in advance.
(A) The slave station 507 detects with a sensor that an object has flowed.
(B) The slave station 508 turns on the red light when detecting that an object has flowed.
(C) The slave station 509 grasps the flowed-in object by the arm robot and conveys the object to the conveyor selected according to the conditions. Here, the condition is the size (large, medium, small) of the product that is a product. For example, when the product size is “large”, it is transported to the conveyor A, when the product size is “medium”, it is transported to the conveyor B, and when the product size is “small”, it is transported to the conveyor C. It

  First, the master station 502 transmits a CPU instruction based on the ladder program to the base station 503. Upon receiving the instruction from the CPU, the base station 503 transmits instruction data based on a ladder program for executing the FA device to each terminal station 504, 505, 506 by wireless communication and wire communication. As an instruction based on the ladder program, the base station 503 first transmits instruction data to the terminal station 504 by wireless communication and wired communication. The instruction data transmitted from the base station 503 to the terminal station 504 is the same data. Specifically, when transmitting instruction data by wireless communication, data is transmitted from the antenna of base station 503 and data is received by the antenna of terminal station 504. When transmitting the instruction data by wire communication, the instruction data transmitted from the base station 503 is received by the terminal station 504 via the switching hub 510.

  The terminal station 504 receives the same data in each of the wireless communication and the wired communication, and transmits any one of the data to the slave station 507. Here, the instruction included in the instruction data is an instruction to execute the process of “notify when the sensor is asserted”. Based on the instruction, when the sensor detects that an object has flowed, the slave station 507 transmits assertion information, which is information indicating the detection, to the terminal station 504. The terminal station 504 transmits the assertion information to the base station 503 by wireless communication and wired communication. Specifically, when transmitting assertion information by wireless communication, the assertion information is transmitted from the antenna of the terminal station 504 and the assertion information is received by the antenna of the base station 503. When transmitting the assertion information by wire communication, the assertion information transmitted from the terminal station 504 is received by the base station 503 via the switching hub 510.

  The base station 503 transmits the received assertion information to the master station 502. In the master station 502, when the CPU recognizes the assertion information received from the slave station 507, it issues an instruction to the slave station 508 to perform the next process based on the ladder program. That is, the master station 502 transmits instruction data based on the ladder program to the base station 503.

  The base station 503 transmits instruction data based on the following ladder program to the terminal station 505 by wireless communication and wired communication. Specifically, when transmitting the instruction data by wireless communication, the data is transmitted from the antenna of the base station 503 and the data is received by the antenna of the terminal station 505. When transmitting the instruction data by wire communication, the instruction data transmitted from the base station 503 is received by the terminal station 505 via the switching hub 510.

  Upon receiving the instruction data from the base station 503, the terminal station 505 transmits the instruction data to the slave station 508. Here, the instruction included in the instruction data is an instruction to execute the process of “turning on the red light”. The slave station 508 that has received the instruction turns on the red light.

  After transmitting the instruction data for turning on the red light to the slave station 508, the master station 502 transmits the instruction data based on the next ladder program to the base station 503. The base station 503 transmits the instruction data to the terminal station 506 by wireless communication and wired communication. Specifically, when transmitting the instruction data by wireless communication, the data is transmitted from the antenna of the base station 503 and the data is received by the antenna of the terminal station 506. When transmitting the instruction data by wire communication, the instruction data transmitted from the base station 503 is received by the terminal station 506 via the switching hub 510.

  Upon receiving the instruction data from the base station 503, the terminal station 506 transmits the instruction data to the slave station 509. Here, the instruction included in the instruction data is a process of "determining the size of the flowed object and allocating it to the conveyor A if" large ", to the conveyor B if" medium ", and to the conveyor C if" small "". This is an instruction to execute. The slave station 509, which has received the instruction, grabs the incoming material with the arm robot and conveys the material to the conveyor according to the previously instructed condition.

<Base Station 503 According to Embodiment 1>
FIG. 6 is a block diagram showing an example of the configuration of the base station 503. The base station 503 has a function of performing wireless communication and wired communication.

  First, the case of transmitting data from the base station 503 to the terminal stations 504, 505, 506 will be described.

  The interface unit 601 has a function of performing electrical conversion and format conversion in order to transmit the instruction from the master station 502 to the data processing unit 602. The data processing unit 602 has a function of accumulating the instruction of the master station 502 received from the interface unit 601 according to the instruction of the control unit 603 and transmitting the data to the selector 604. The data processing unit 602 may store the instruction of the master station 502 after processing it according to the instruction of the control unit 603. The data processing unit 602 has a memory that internally stores data. This memory is used as a priority storage location and a temporary storage location until the ARQ delivery can be confirmed. Further, the data processing unit 602 may have a function of notifying the control unit 603 of arrival data related information which is information related to the arrived data. The arrival data-related information includes, for example, destination information, data size, information about required QoS (Quality of Service) [allowable delay time, etc.], and time information when the information arrived at the base station 503. The information about the required QoS may be, for example, a PCP (Priority Code Point) in IEEE802.1Q between the master station 502 and the base station 503, or priority control related information such as a DiffServ DS field defined in IETF 2474. .. In addition, as the information regarding the required QoS, a priority control setting information list for each communication data type specified via the master station 502, which is preset in the PC 501 [grant ID and priority to each communication data], and each It may be ID information added to the header of communication data. The time information when the information arrives at the base station 503 may be, for example, time information obtained from PTP (Precision time protocol) in IEEE1588 or time information obtained from NTP (Network Time Protocol). Further, the time information when the information arrives at the base station 503 may be a time stamp added to a data header such as RTP (Real-time Transport Protocol).

  The data processing unit 602 may have a function of receiving transmission data designation information from the control unit 603, for example, a transmission or retransmission instruction of accumulated data or a transmission timing instruction. In this way, the data processing unit 602 processes the data to be transmitted to the selector 604 according to the instruction of the control unit 603.

  The selector 604 has a function of switching between wireless communication and wired communication when transmitting and receiving data. Note that in FIG. 6, the selector 604 is described, but the selector 604 does not select either wireless communication or wired communication, but duplicates the same data to wired communication and wireless communication to obtain data. Send. Further, the selector 604 receives the data transmitted from the data processing unit 602. Then, the copied data is transmitted to the wired interface unit 605 and the wireless interface unit 606.

  The wired interface unit 605 receives a signal flowing from the data processing unit 602 via the selector 604, and transmits the signal by wired communication.

  Although the wireless interface unit 606 is described as a 3GPP-compliant protocol in the first embodiment, a wireless LAN-compliant protocol such as GSM, Bluetooth, or IEEE 802.11a / b / g / n / ac / ad. May be The wireless interface unit 606 receives a signal flowing from the data processing unit 602 via the selector 604 and transmits the signal by wireless communication.

  Next, a case where the base station 503 receives data from the terminal stations 504, 505, 506 will be described.

  The wired interface unit 605 has a function of receiving data from the terminal stations 504, 505, 506 and transmitting the data to the selector 604. The wireless interface unit 606 also has a function of receiving data from the terminal stations 504, 505, 506 and transmitting the data to the selector 604. The selector 604 transmits any one of the data received from the slave stations 507, 508, and 509 through the wired interface unit 605 and the wireless interface unit 606 to the data processing unit 602. Note that the selector 604 may switch based on an instruction from the control unit 603 to determine whether to receive by wire communication or wireless communication.

  The data processing unit 602 receives the data output from the selector 604. The data processing unit 602 has a function of sending the received data to the control unit 603. The data processing unit 602 has a function of notifying the control unit 603 of arrival data related information. As the arrival data related information, for example, transmission by the wired interface unit 605, transmission discrimination information by the wireless interface unit 606, transmission source information, data size, ACK / NACK of downlink data, required QoS (Quality of Service) [acceptable Delay time, etc., and information about both the time when the data transmitted from the base station 503 arrives at the terminal station and the time when the data transmitted from the terminal stations 504, 505, 506 reach the base station 503. Can be mentioned.

  The required QoS information sent from the wired interface unit 605 may be, for example, a PCP (Priority Code Point) in IEEE802.1Q between the master station 502 and the base station 503, such as a DiffServ DS field defined in IETF 2474. It may be information related to priority control. Also, as the required QoS information, a priority control setting information list for each communication data type designated via the master station 502, which is preset in the PC 501 [assign ID and priority to each communication data], and each communication It may be ID information given to the header of the data. By preferentially transmitting the control data to be transmitted to the device requiring high-speed control, the delay time can be shortened or the data can be reliably transmitted within the specified time. In addition, even in the same device, it is possible to postpone transmission of non-emergency data such as a log of the operation status of the device, and to reliably transmit a signal for motion-control that requires a low delay operation. it can. The time information when the data transmitted by the base station 503 reaches the terminal stations 504, 505, 506 is given by the terminal stations 504, 505, 506 based on the time obtained from PTP (Precision time protocol) in IEEE 1588, for example. The timing information may be the timing information given by the terminal stations 504, 505, 506 based on the time obtained from the time information obtained from the NTP (Network Time Protocol). Further, the time information when the data transmitted by the base station 503 reaches the terminal stations 504, 505, 506 may be a time stamp attached to a data header such as RTP (Real-time Transport Protocol). By defining an allowable delay time information list [giving an ID and an allowable delay time for each communication data] for each communication data type specified in advance from the PC 501 via the master station 502, the allowable delay time information list It is possible to preferentially transmit data that is likely to exceed the delay time, and it is possible to reliably transmit a signal for motion-control, which requires a low delay operation, even if a plurality of various devices are connected.

  The required QoS information sent from the wireless interface unit 606 includes, for example, an ID for each communication data assigned when setting a wireless channel. Correspondence is made in the priority control setting information list [grant ID and priority for each communication data] for each communication data type specified via the master station 502 at the time of downlink setting. As for the time stamp, since the timing of wireless transmission is managed in 3GPP-related LTE and 5G, the time stamp is sent to the control unit 603. In the case of a wireless LAN or the like, the processing is the same as the wired communication.

  The interface unit 601 has a function of receiving data from the data processing unit 602 and reporting the data to the master station 502.

<Terminal stations 504, 505, 506 according to the first embodiment>
FIG. 7 is a block diagram showing an example of the configuration of the terminal station 504. The terminal station 504 has a function of performing wireless communication and wired communication. Although FIG. 7 shows the configuration of the terminal station 504, the same applies to the terminal stations 505 and 506.

  First, a case where the terminal station 504 receives data from the base station 503 will be described.

  The wired interface unit 705 has a function of receiving data from the base station 503 and transmitting the data to the selector 704. Similarly, the wireless interface unit 706 also has a function of receiving data from the base station 503 and transmitting it to the selector 704. The selector 704 receives the data transmitted from the master station 502 via the base station 503 via the wired interface unit 705 and the wireless interface unit 706, and selects any one of the received data from the data processing unit 702. Send to. Note that the selector 704 may switch based on an instruction from the control unit 703 to determine whether to receive by wire communication or wireless communication.

  The data processing unit 702 receives the data output from the selector 704. The data processing unit 702 also has a function of sending the received arrival data related information to the control unit 703. The interface unit 701 has a function of receiving the data output from the data processing unit 702 and giving an instruction to the slave station 502.

  Next, a case where data is transmitted from the terminal station 504 to the base station 503 will be described.

  The interface unit 701 has a function of receiving a transmission report from the slave station 502 and outputting the report from the slave station 502 to the data processing unit 702. The data processing unit 702 has a function of sending the report of the slave station 502 received from the interface unit 701 to the selector 704.

  The data processing unit 702 has a function of a memory that internally stores data, and can also transmit the stored data to the selector 704 at one time. The data processing unit 702 has a function of transmitting arrival data related information to the control unit 703. The data processing unit 702 also has a function of receiving an instruction from the control unit 703 such as designation of transmission data. The data processing unit 702 receives the instruction from the control unit 703 and transmits the data to the selector 704. The selector 704 transmits the duplicated data to the wired interface unit 705 and the wireless interface 706.

  The wired interface unit 705 receives a signal flowing from the data processing unit 702 via the selector 704, and transmits the signal by wired communication.

  The wireless interface unit 706 represents a wireless network such as WiFi or Bluetooth. The wireless interface unit 706 receives a signal flowing from the data processing unit 702 via the selector 704, and transmits the signal by wireless communication.

<Description of Processing of Communication System According to First Embodiment>
The communication system according to the first embodiment will be described using the protocol stack in FIG.

  As shown in FIG. 8, the transport layers 802 and 810 are TCP / UDP, detect errors, correct errors, and control retransmission, and determine the establishment of a communication path. The network layers 803 and 811 are IP and receive data from the transport layers 802 and 810 and transmit data. Further, the network layers 803 and 811 have a function of reporting the received data to the transport layers 802 and 810.

  The adaptation layer 804 transmits the same data to the wireless communication and the wired communication, and the adaptation layer 812 transmits any one of the data received by the wireless communication and the wired communication to the upper layer, and the master station 502 or The slave stations 507, 508, and 509 perform processing for transmitting and receiving data by wireless communication and wired communication.

  The link layers 805 and 815 are Ethernets, which are interfaces for passing data between protocols during wired communication. The link layers 807 and 813 are PDCP / RLC / MAC, for example, and are interfaces for passing data between protocols during wireless communication. The physical layers 806, 808, 814, 816 are standard transmission media such as RJ45 or CAT5. The application layers 801, 809 are instruction information from the master station 502 to the slave stations 507, 508, 509 or monitoring information from the slave stations 507, 508, 509.

  The data flow in the communication system according to the first embodiment will be described with reference to the protocol stack shown in FIG.

  The instruction from the master station 502 transmitted from the application layer 801 is transmitted to the adaptation layer 804 via TCP / UDP, which is the transport layer 802, and IP, which is the network layer 803. The adaptation layer 804 transmits the same data by wire communication and wireless communication. Here, the adaptation layer 804 corresponds to the functions of the data processing unit 602, the selector 604, and the control unit 603 of FIG. 6 described above.

  When data is transmitted by wireless communication, the data is passed to the PDCP / RLC / MAC that is the link layer 807. After that, the data is passed to the physical layer 808 and transmitted from the base station 503 by wireless communication. The terminal stations 504, 505, 506 on the receiving side send the received data to the adaptation layer 812 via the physical layer 814 and the PDCP / RLC / MAC which is the link layer 813.

  When data is transmitted by wire communication, the data is passed to the link layer 805, Ethernet. After that, the data is passed to the physical layer 806, and the data is transmitted by wire communication from the base station 503 side. The terminal stations 504, 505, and 506 on the receiving side send the received data to the adaptation layer 812 via the physical layer 816 and the Ethernet that is the link layer 815.

  Any one of data received by wireless communication and wire communication is selected in the adaptation layer 812. The selected data is output as an instruction from the application layer 809 to the slave stations 507, 508, 509 through the adaptive layer 812, the network layer 811, the IP, and the transport layer 810, TCP / UDP.

  From the above, according to the first embodiment, when the same data is transmitted by the wired communication and the wireless communication, and the same data is received by the receiving device by the wired communication and the wireless communication, the wired communication or the wireless communication is performed. By selecting one of them, when there is a possibility that the wireless communication environment in the factory will temporarily deteriorate due to layout changes etc., stable communication can be provided by laying a wired communication cable. .. That is, according to the communication system of the first embodiment, stable communication can be ensured.

  In addition, although the case where the same data is transmitted from both the one-system wireless communication and the one-system wired communication has been described above, the same applies to the case where each of the wireless communication and the wired communication has a plurality of systems.

  The case where the base station 503 is installed in the master station 502 during wireless communication has been described above, but as shown in FIG. 9, the master station 502 may also be provided with the terminal station 901 that is the first terminal station. In this case, the terminal station 901 connected to the master station 502 and the terminal stations 504, 505, which are the second terminal stations connected to the slave stations 507, 508, 509, are simply passed through the separately provided base station 902. The terminal station 901 connected to the master station 502 has the same function as the base station 503 shown in FIG. 6 described above, as long as it communicates with the master station 502.

  Further, in the communication system shown in FIG. 9, the terminal station 901 connected to the master station 502 and the terminal stations 504, 505, 506 connected to the slave stations 507, 508, 509 may directly communicate with each other. Such communication corresponds to connection by a wireless LAN or communication standardized as PC5 in 3GPP. In this case, the terminal station 901 connected to the master station 502 has the function of the base station 503 described above as it is.

  Further, although the case where the IP processing is performed in the network layer 803 has been described above as an example, the IP processing and the Ethernet processing may be performed in the network layer 803, and the data after the Ethernet processing may be processed in the adaptation layer 804. In this case, the output of the adaptation layer 804 is input to the link layer (PDCP / RLC / MAC) 807 in the same manner as described above and the same processing as that described above is performed, but the processing of the link layer (Ethernet) 805 is lost and is directly performed. It is input to the physical layer 806. Further, the processing of the link layer (Ethernet) 815 is also eliminated, and the IP processing and the Ethernet processing are performed in the network layer 811.

<Modification 1>
In the first embodiment, a case where each of the selector 604 of the base station 503 and the selector 704 of the terminal stations 504, 505, 506 selects any one of the data received by the wireless communication and the wire communication will be described. did. In the first modification, each of the selector 604 of the base station 503 and the selector 704 of the terminal stations 504, 505, 506 selects the data that arrives first among the data received by the wireless communication and the wire communication. Characterize.

  Specifically, the adaptation layer 804 on the transmitting side gives a time stamp, and the adaptation layer 812 on the receiving side manages data arriving from each of the wireless communication and the wired communication having the same time stamp, and receives the data first. Only the data is passed to the upper layer, the network layer 811, and the other data is discarded. This can cause delays by waiting for both wireless and wired communication data to arrive, or inconsistencies due to both wireless and wired communication data being input to the upper layer. Can be avoided.

  Further, when the data acquired from the network layer 803 is transmitted from the adaptation layer 804, it is desirable that the data division unit has the same size in wireless communication and wire communication. It is desirable that the data size input to the link layer 805 and the link layer 807 is the same size, not the data size sent to the physical layers 806, 808, 814, 816. Even if one packet such as an IP packet or a TCP packet does not arrive at the adaptation layer 812, the selectors 604 and 704 can select the data that has arrived first, so that one packet such as an IP / TCP packet can be received. Since it is not necessary to secure a packet assembling memory for confirmation by both wireless communication and wired communication, the memory amount can be reduced (see FIGS. 10 and 11).

  In addition, although the case where the modification 1 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 1 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 2>
In the first embodiment, the memory waiting for delivery confirmation in the data processing unit has been described as the priority order of transmission and the temporary storage location of data until the delivery of ARQ can be confirmed. It is desirable to apply this to memory management waiting for delivery confirmation for communication, and to apply the delivery confirmation result in wireless communication to memory management waiting for delivery confirmation for wired communication.

  Usually, the unit of data transmission is different between wireless communication and wired communication. In wireless communication and wired communication, when data is congested in another device, transmission waiting or retransmission occurs. Due to these factors, the data processing unit needs to separately hold a delivery confirmation waiting memory for wireless communication and a delivery confirmation waiting memory for wired communication. For data whose delivery is confirmed by wireless communication, it is preferable not only to release the delivery confirmation waiting memory of wireless communication but also to release the delivery confirmation waiting memory corresponding to the data of wired communication.

  Further, as shown in FIG. 12, the transmission / reception processing itself of the data in the wire communication may be stopped (release of the resource for the in-process data reception processing). When the arrival of a packet is confirmed by wired communication, in order to release the resources in the own station in order to release the wireless resources, and to avoid the inconsistency between the base station and the terminal station, AM is used by RLC (Radio Link Control). When operating in the (Acknowledged Mode) mode / UM (Unacknowledged Mode) mode, an sdu (Service Data Unit) discard instruction of RLC is transmitted to the receiving side.

  The sdu discard instruction has a smaller number than the specified SN (Sequence Number) and discards the sdu corresponding to the SN included in the specific window size, thereby reducing the processing when discarding a plurality of sdus. .. The specific window size may be set in advance by an RRC (Radio Resource Control) message (RRC Connection Reconfiguration Request). By providing this mechanism, it is possible to avoid performing retransmission processing until a timeout occurs, and it becomes possible to quickly transmit the next packet (see FIG. 13). Further, since the wired communication and the wireless communication are individually set to the link, the next packet by the wired communication may be transmitted without waiting for the RLC sdu discard complete.

  Note that, in FIG. 13, Ethernet is a link layer of wired communication, but is shown in parentheses because it is not involved in the content of data only by format conversion.

  Although the case where the second modification is applied to the communication system illustrated in FIG. 5 has been described above, the second modification may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 3>
In wireless communication, various low-delay transmission technologies are being studied, and there are various types such as connection via the Internet network even in wired communication, and in both wireless communication and wired communication, it takes various times to transmit application data and reach the opposite device. Become. In the third modification, not only transmission data is simply duplicated, but also a delay time is provided in the adaptation layer so that the same delay time is applied to both wireless communication and wired communication.

  With the above configuration, for example, the wireless communication environment in the factory may be temporarily deteriorated due to layout changes, etc., and when a wired communication cable is laid, the control delay at the slave station may be delayed. Since there is no difference between the wireless communication and the wired communication, there is no fear of a setting error such as a human error, and it is possible to switch between the wireless communication and the wired communication.

  Specifically, it is realized by providing the selectors 604 and 704 with delay elements having a transmission delay and instructing the transmission timing information from the control units 603 and 703.

  Further, more specifically, if there is no waiting time for data retransmission due to a transmission error in wireless transmission or for avoiding data collision with other terminals in wired transmission, a value for the time when data arrives at the opposite device at the same time is set. When the delay elements are set and the transmission timing information is instructed from the control units 603 and 703, the delay time can be minimized on average.

  In addition, although the case where the modification 3 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 3 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 4>
In the fourth modification, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication and wireless communication as shown in FIG. Further, the same data is transmitted by wire communication and wireless communication. On the receiving side, when receiving data, the user can arbitrarily select in advance which communication method, wired communication or wireless communication, to acquire the data. However, when the selected data does not arrive within a predetermined time, or when the unselected data arrives, the data not selected by the user is adopted.

  The process of the fourth modification will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. The input data is stored in the memory included in the data processing unit 1302. At this time, the input data is transmitted to the selector 1304. The selector 1304 duplicates the data accumulated in the memory of the data processing unit 1302 according to an instruction from the control unit 1303, and transmits the data for both wired communication and wireless communication.

  Then, the data is transmitted from the base station 503 by wire communication through the wire interface unit 1305, and is transmitted from the base station 503 by wireless communication through the wireless interface unit 1306. Here, it is possible to select in advance which data of wired communication or wireless communication is to be preferentially used by the DIP switch 1307.

  When data is transmitted from the base station 502, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505, 506 after the transmission. At this time, the timing information (ACK information) received by wired communication is sent to the data processing unit 1302 through the selector 1304 based on the instruction from the control unit 1303 after passing through the wired interface unit 1305. Further, the timing information (ACK information) received by wireless communication is sent to the data processing unit 1302 through the selector 1304 based on the instruction from the control unit 1303 after passing through the wireless interface unit 1306. Then, the timing information (ACK information) for confirming the delivery of the wired communication and the wireless communication is transmitted to the control unit 1303.

  The control unit 1303 confirms the delivery of the data of the wired communication and the wireless communication, and if the delivery of the data of the wired communication and the wireless communication can be confirmed, according to the fact that the wireless communication data is selected in advance, the wireless communication data is selected. To use. At that time, the information accumulated in the memory of the data processing unit 1302 is cleared. If there is a problem in the wired communication data transmission and the delivery cannot be confirmed, and only the wireless communication data delivery can be confirmed, the wireless communication data is used. If there is a problem in the wireless communication data transmission and the delivery cannot be confirmed, and only the wired communication data delivery is confirmed, the wired communication data is used instead of the wireless communication data. If the control unit 1303 can confirm the arrival of the data, the data stored in the memory of the data processing unit 1302 is erased. The control unit 1303 gives an instruction to erase the data.

  For example, it is assumed that when a production line having a production record in a factory is operating, the user can grasp which communication quality of wired communication or wireless communication is reliable based on the past record. In this case, the user can select which communication method, wired communication or wireless communication, should be prioritized according to the operation record. It is assumed that the user can determine which of the wired communication method and the wireless communication method is to be prioritized based on the past operation record of the FA device.

  Here, when the data transmission / reception cannot be performed within a predetermined time by the communication method selected by the user, when controlling the FA equipment on the production line, the control using the communication method of the wireless communication has been performed so far. Suppose you are manufacturing a product. If a communication error occurs while the production line is in operation and the other wire communication is established, the wire communication not selected by the user is adopted. This has two advantages. First, when communication is not established due to sudden interruption of wireless communication or deterioration of communication quality, by adopting wired communication instead of data transmission by wireless communication, the role of communication as a backup can be achieved. It is to carry. This is necessary for performing communication such as ensuring communication quality or low delay. The second is to play a role in early detection of communication anomalies. By switching from a wireless communication method that has a communication history of data transmission and reception to a wired communication method, the user can instantly identify that something is wrong, and the initial response when a trouble occurs becomes faster. effective.

  In addition, although the case where the modification 4 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 4 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 5>
In the fifth modification, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication or wireless communication. In addition, while one data is being transmitted by only one of the wired communication and the wireless communication, the wired communication is switched to the wireless communication, or the wireless communication is switched to the wired communication as necessary.

  The process of the fifth modification will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. The input data is transmitted from the data processing unit 1302 to the selector 1304. The selector 1304 transmits by either wired communication or wireless communication according to an instruction from the control unit 1303. Data passes through the wired interface unit 1305 or the wireless interface unit 1306 and is transmitted from the base station 503 by wired communication or wireless communication. Further, during data transmission, it is possible to select and switch which data of wired communication or wireless communication is to be preferentially used by the DIP switch 1307. At this time, the DIP switch 1307 can be switched in units of one data chunk (eg, IP packet) to be transmitted. In the following, a case of switching data from wired communication to wireless communication and transmitting the data will be described.

  After data is transmitted from the base station 503, arrival timing information (ACK information) from the terminal stations 504, 505, 506 is transmitted. When the timing information (ACK information) is transmitted from the terminal stations 504, 505, 506 by wire communication, the timing information (ACK information) passes through the wire interface unit 1305 and then based on an instruction from the control unit 1303. It is sent to the data processing unit 1302 through the selector 1304. Here, when the DIP switch 1307 switches to wireless communication transmission during data transmission, the selector 1304 switches data transmission from wired communication to wireless communication according to an instruction from the control unit 1303. At this time, data transmission by wire communication is turned off.

  After switching to wireless communication and transmitting data, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505, 506. The timing information (ACK information) received by wireless communication passes through the wireless interface unit 1306, then passes through the selector 1304 based on an instruction from the control unit 1303, and is sent to the data processing unit 1302. In this way, the DIP switch 1307 can switch from wired communication to wireless communication or from wireless communication to wired communication during data transmission. Upon receiving the arrival timing information (ACK information) from the data processing unit 1302, the control unit 1303 confirms delivery for each one data chunk (eg, IP packet) to be transmitted, and performs wired communication during data transmission. Alternatively, it becomes possible to switch to wireless communication.

  Assuming that the control room and the FA device are connected to each other by wire communication or wireless communication in the factory production line, the terminal stations 504, 505 connected to the slave stations 507, 508, 509 from the base station 503 will be described. , 506, it is possible to transmit by wire communication for each chunk of data (eg IP packet), or it is possible to switch from wire communication and transmit by wireless communication. .. That is, it is possible to switch to wired communication or wireless communication for each piece of data to be transmitted and transmit the data.

  In this way, when a communication trouble occurs during data transmission by either wired communication or wireless communication by switching to wired communication or wireless communication for each chunk of data and enabling transmission. Also, by switching to wired communication or wireless communication, it is possible to expect an effect that communication quality can be secured and data can be transmitted with low delay.

  In addition, although the case where the modification 5 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 5 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 6>
In the sixth modification, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication and wireless communication as shown in FIG. Further, the same data is transmitted by wire communication and wireless communication. At this time, the base station 503 preferentially selects wireless communication and transmits data.

  The process of the sixth modification will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. The input data is stored in the memory included in the data processing unit 1302. At this time, the data processing unit 1302 transmits the data to the selector 1304. The selector 1304 copies the data stored in the memory of the data processing unit 1302 to both the wired interface unit 1305 and the wireless interface unit 1306 according to an instruction from the control unit 1303 and transmits the data. At this time, since the wireless communication is prioritized for transmission, the data passes through the wireless interface unit 1306 and is transmitted from the base station 503 by wireless communication. Also, while giving priority to wireless communication, data is transmitted from the base station 503 by wired communication through the wired interface unit 1305. It should be noted that it is possible to select in advance which data of wired communication or wireless communication is to be preferentially used by the DIP switch 1307. In the sixth modification, wireless communication is selected in order to prioritize wireless communication.

  After the data is transmitted from the base station 503, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505 and 506. At this time, the timing information (ACK information) transmitted by wired communication passes through the wired interface unit 1305, and then passes through the selector 1304 based on the instruction of the control unit 1303 and is sent to the data processing unit 1302. Further, the timing information (ACK information) sent by wireless communication passes through the wireless interface unit 1306, then passes through the selector 1304 based on the instruction of the control unit 1303, and is sent to the data processing unit 1302.

  The delivery confirmation timing information (ACK information) transmitted in each of the wired communication and the wireless communication is transmitted from the data processing unit 1302 to the control unit 1303. The control unit 1303 confirms the delivery of the data by the wired communication and the wireless communication, and if the delivery of the data by the wireless communication can be confirmed, the wireless communication is used because the wireless communication is prioritized. In this case, the information stored in the memory of the data processing unit 1302 is cleared. In addition, if there is a problem in data transmission by wireless communication and delivery cannot be confirmed, and only data delivery by wired communication is confirmed, data by wireless communication is not used and data by wired communication is used. When the arrival of the data can be confirmed, the data stored in the memory of the data processing unit 1302 is erased. The control unit 1303 gives an instruction to erase.

  At present, in the production line of a factory, in many cases, the layout of the process is frequently changed in order to cope with the production of a wide variety of small quantities. For example, when transmitting data for controlling an FA device from a base station to a terminal station, when trying to transmit data by wire communication, cable wiring becomes complicated, or it is necessary to correct an incorrect cable connection. In particular, it is difficult to operate efficiently in the initial stage of starting the production process. On the other hand, according to the sixth modified example, by preferentially selecting the wireless communication over the wired communication, the effect of improving the production efficiency can be expected in the initial stage of starting the production process.

  In addition, although the case where the modification 6 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 6 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 7>
In this modification 7, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication and wireless communication as shown in FIG. Further, the same data is transmitted by wire communication and wireless communication. At this time, when the base station 503 can confirm the data transmission by the wireless communication while transmitting the data by the wire communication, the base station 503 prioritizes the transmission by the wireless communication for the data to be transmitted next time.

  The process of the seventh modification will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. The input data is stored in the memory included in the data processing unit 1302. At this time, the data processing unit 1302 transmits the data to the selector 1304. The selector 1304 transmits the data stored in the memory of the data processing unit 1302 to the wired interface unit 1305 according to an instruction from the control unit 1303. The data is transmitted from the base station 503 by wired communication through the wired interface unit 1305.

  After data is transmitted from the base station 503 by wire communication, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505, 506. The timing information (ACK information) transmitted by wire communication passes through the wire interface unit 1305, and then passes through the selector 1304 based on the instruction of the control unit 1303 and is sent to the data processing unit 1302.

  Further, the base station 503 transmits data by wireless communication while transmitting data by wire communication. The data is transmitted from the base station 503 by wireless communication through the wireless interface unit 1306. After data is transmitted by wireless communication from the base station 503, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505, 506. The timing information (ACK information) transmitted by wireless communication passes through the wireless interface unit 1306, then passes through the selector 1304 based on the instruction of the control unit 1303, and is sent to the data processing unit 1302. When the delivery of wireless communication is confirmed from the timing information (ACK information) received from the data processing unit 1302, the control unit 1303 performs control to transmit data by wireless communication next time. In this case, the control unit 1303 stops the data transmission by wire communication.

  For example, when transmitting data for controlling FA devices from a base station to a terminal station, when a certain data chunk (eg TCP packet) is transmitted, a wired connection is established and reliable. And At this time, if the wireless connection is not yet established, the wired connection is directly adopted. On the other hand, if a wireless connection is established during data transmission by wired communication, it is determined that the wireless connection can be prioritized the next time a block of data is transmitted, and the adaptation layer will establish a wireless connection from the wired connection. Switch to.

  In such a communication method, data transmission / reception between a base station and a terminal station is performed by wire communication and wireless communication, but the priority of wireless communication is high. If the record of establishing a wireless connection or the communication quality of wireless communication is secured in advance, the wireless communication is preferentially switched to the wireless communication. Thus, if it is determined that the wireless communication is established while transmitting the data by the wired communication, the wireless connection is prioritized next time. When changing the layout of a production factory, first, communication is performed by wire communication, and a wireless communication system is constructed while operating the production line. Then, the wired communication is gradually switched to the wireless communication, and when the wireless communication is established in the whole production factory, the wired communication can be turned off and the complicated cable wiring can be removed.

  In addition, although the case where the modification 7 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 7 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 8>
In Modified Example 8, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wired communication and wireless communication as shown in FIG. Further, the same data is transmitted by wire communication and wireless communication. At this time, the base station 503 switches wireless communication and wired communication at regular time intervals and alternately transmits data.

  The process of the eighth modification will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. The input data is transmitted from the data processing unit 1302 to the selector 1304. The selector 1304 alternately switches the wired communication and the wireless communication at regular time intervals according to an instruction from the control unit 1303, and transmits the data.

  Data is transmitted by wireless communication within a fixed time interval. In this case, the data passes through the wireless interface unit 1306 and is transmitted from the base station 503 by wireless communication. After the data is transmitted from the base station 503, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505 and 506. The timing information (ACK information) transmitted by wireless communication passes through the wireless interface unit 1306, then passes through the selector 1304 based on the instruction of the control unit 1303, and is sent to the data processing unit 1302.

  Simultaneously with the end of the data transmission by wireless communication within a fixed time interval, the data transmission by wire communication is performed. The DIP switch 1307, which performs selection for switching between wired communication and wireless communication, alternately switches at a fixed time interval, and performs wired communication transmission within the next fixed time interval. In this case, the data passes through the wired interface unit 1305 and is transmitted from the base station 503 by wired communication. After the base station 503 data is transmitted, arrival timing information (ACK information) is transmitted from the terminal stations 504, 505, 506. The timing information (ACK information) transmitted by wired communication passes through the wired interface unit 1305 and then passes through the selector 1304 based on the instruction of the control unit 1303 and is sent to the data processing unit 1302. Similarly, thereafter, data is transmitted by wireless communication within a fixed time interval.

  For example, when transmitting data for controlling FA devices from a base station to a terminal station, it is possible to constantly check the operation of the communication status of wired communication and wireless communication by switching between wired communication and wireless communication at regular time intervals. This is effective in maintaining the communication quality of wired communication and wireless communication. For example, when wire communication is used for a long time and suddenly switched to wireless communication, an effect of preventing the communication device from deteriorating and malfunctioning can be expected.

  Note that, although the case where the modification 8 is applied to the communication system shown in FIG. 5 has been described above, the modification 8 can be applied to the communication system shown in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Modification 9>
In the ninth modification, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication and wireless communication as shown in FIG. Further, the same data is transmitted by wire communication and wireless communication. At this time, the network administrator can switch between wired communication and wireless communication.

  The processing of this modification 9 will be described with reference to FIG.

  Instruction data from the master station 502 is input to the data processing unit 1302 through the interface unit 1301. Then, the data processing unit 1302 transmits the data to the selector 1304. The selector 1304 switches to wired communication or wireless communication according to an instruction from the control unit 1303. The control unit 1303 can select whether to preferentially use data by wire communication or data by wireless communication by using the DIP switch 1307. When the DIP switch 1307 is connected to an external PC, the network administrator operates the PC to arbitrarily switch between wired communication and wireless communication.

  For example, when transmitting data for controlling FA devices from a base station to a terminal station, a network administrator manages switching between wired communication and wireless communication. This is effective when the network administrator needs to perform an operation such as an emergency stop during the operation of the production line.

  In addition, although the case where the modification 9 is applied to the communication system illustrated in FIG. 5 has been described above, the modification 9 may be applied to the communication system illustrated in FIG. 9. In this case, the terminal station 901 directly connected to the master station 502 has the function of the base station 503 shown in FIG.

<Second Embodiment>
In the first embodiment, a case has been described in which the same data is transmitted by wire communication and wireless communication, and reception is completed at the same time. In the second embodiment, a case will be described where data is transmitted simultaneously by wire communication and wireless communication.

  The configuration of the communication system for transmitting and receiving data by wire communication and wireless communication between the base station and the terminal station is similar to that of FIG. 5 or 9 of the first embodiment, and therefore detailed description thereof is omitted here. Differences from the first embodiment will be described below using the protocol stack of FIG.

  As shown in FIG. 15, the transport layers 1402 and 1410 are TCP / UDP, and provide a mechanism for distinguishing and transmitting the wireless communication. The network layers 1403 and 1411 are IPs, allocate IP addresses to data, and perform communication using packets. The adaptation layers 1404 and 1412 determine whether to transmit / receive data by wired communication or wireless communication, and switch the master station 502 or the slave stations 507, 508, 509 to transmit data by wireless communication or wired communication. To do. In addition, the adaptation layers 1404 and 1412 determine the timing of data transmission / reception.

  The link layers 1405 and 1415 are Ethernets, which are interfaces for exchanging data between protocols. The link layers 1407 and 1413 are PDCP / RLC / MAC and are interfaces for passing data between protocols during wireless communication. The physical layers 1406, 1408, 1414, 1416 are standard transmission media such as RJ45 or CAT5.

  The data flow in the communication system according to the second embodiment will be described using the protocol stack in FIG.

  The transport layer 1402 distinguishes where to communicate using wireless communication by TCP / UDP. Then, the data of the wireless communication and the wired communication is passed to the IP which is the network layer 1403. The IP, which is the network layer 1403, manages and selects the transmission path of the data of the wired communication and the wireless communication so that the data is transmitted simultaneously by the wired communication and the wireless communication, and the data is transmitted to the adaptation layer 1404. As a result, data is simultaneously transmitted by wire communication and wireless communication.

  When data is transmitted by wireless communication, the data is passed to PDCP / RLC / MAC that is the link layer 1407. After that, the data is passed to the physical layer 1408 and transmitted from the base station 503 by wireless communication. The terminal stations 504, 505, 506 on the receiving side send the received data to the IP which is the network layer 1411 via the physical layer 1414, the PDCP / RLC / MAC which is the link layer 1413, and the adaptation layer 1412. Then, the data is received at the slave stations 507, 508, 509 through the TCP / UDP which is the transport layer 1410.

  On the other hand, when data is transmitted by wired communication, the data is passed to the link layer 1405, Ethernet. After that, the data is passed to the physical layer 1406 and transmitted from the base station 503 by wire communication. The terminal stations 504, 505, and 506 on the receiving side send the received data to the IP which is the network layer 1411 via the physical layer 1416, the Ethernet which is the link layer 1415, and the adaptation layer 1412. Then, the data is received at the slave stations 507, 508, 509 through the TCP / UDP which is the transport layer 1410.

  As described above, according to the second embodiment, wired communication is performed using functions such as management and selection of a data transmission path, conversion and adjustment of a data transmission / reception unit, and priority control by the IP that is the network layer 1403. It is possible to perform management so that the wired communication data, which is the data to be transmitted in step S1, and the wireless communication data, which is the data to be wirelessly transmitted, are simultaneously transmitted. Therefore, it is possible to secure communication quality while simultaneously transmitting data by wire communication and wireless communication. That is, according to the communication system of the second embodiment, stable communication can be ensured.

<Modification 1>
In the first modification, data transmission / reception between the base station 503 and the terminal stations 504, 505, 506 is performed by wire communication and wireless communication. Further, the transmission timings of the wired communication and the wireless communication are adjusted so that the data reception by the wired communication and the wireless communication are completed at the same time.

  The base station 503 simultaneously transmits data by both wireless communication and wired communication. At this time, if data is transmitted at the same time by wire communication and wireless communication, the timing of receiving data is deviated on the receiving side due to the difference between the wire communication transmission path and the wireless communication transmission path. Therefore, the transmission timings of the wired communication and the wireless communication are controlled.

  Specifically, by making a time difference between the wired communication and the wireless communication in the data transmission timing in the transport layer, the reception side can simultaneously complete the reception of each data by the wired communication and the wireless communication. To be possible.

  In this way, when data is transmitted by wired communication and wireless communication, by adjusting the transmission timing so that the reception of data is completed at the receiving side at the same time, communication quality is ensured and communication with even lower delay is achieved. It has the effect of building a system.

  It should be noted that in the present invention, the respective embodiments can be freely combined, or the respective embodiments can be appropriately modified or omitted within the scope of the invention.

  101 PC, 102 master station, 103 base station, 104, 105, 106 terminal station, 107, 108, 109 slave station, 201 application layer, 202 transport layer, 203 network layer, 204 link layer, 205 physical layer, 206 application Layer, 207 transport layer, 208 network layer, 209 link layer, 210 physical layer, 301 PC, 302 master station, 303 base station, 304, 305, 306 terminal station, 307, 308, 309 slave station, 401 application layer, 402 transport layer, 403 network layer, 404 link layer, 405 physical layer, 406 application layer, 407 transport layer, 408 network layer, 409 link layer, 410 physical layer, 501 PC, 502 master station, 503 base station, 504 , 505, 506 terminal station, 507, 508, 509 slave station, 510 switching hub, 601 interface unit, 602 data processing unit, 603 control unit, 604 selector, 605 wired interface unit, 606 wireless interface unit, 701 interface unit, 702 Data processing unit, 703 control unit, 704 selector, 705 wired interface unit, 706 wireless interface unit, 801 application layer, 802 transport layer, 803 network layer, 804 adaptation layer, 805 link layer, 806 physical layer, 807 link layer, 808 physical layer, 809 application layer, 810 transport layer, 811 network layer, 812 adaptation layer, 813 link layer, 814 physical layer, 815 link layer, 816 physical layer, 901 terminal station, 902 base station, 1301 interface section, 1302 Data processing unit, 1303 control unit, 1304 selector, 1305 wired interface unit, 1306 wireless interface unit, 1307 DIP switch, 1401 application layer, 1402 transport layer, 1403 network layer, 1404 adaptation layer, 1405 link layer, 140 6 physical layer, 1407 link layer, 1408 physical layer, 1409 application layer, 1410 transport layer, 1411 network layer, 1412 adaptation layer, 1413 link layer, 1414 physical layer, 1415 link layer, 1416 physical layer.

Claims (19)

A communication system comprising a base station and a terminal station communicatively connected to the base station,
The base station and the terminal station are connected by wireless communication and wired communication,
The base station transmits the same data to the terminal station in each of the wireless communication and the wired communication,
The communication system, wherein the terminal station selects one of the data received from the base station in the wireless communication and the wired communication. The terminal station transmits the same data to the base station in each of the wireless communication and the wired communication,
The communication system according to claim 1, wherein the base station selects one of the data received from the terminal station in the wireless communication and the wired communication.   3. The communication system according to claim 1, wherein the terminal station selects the earlier received data from the respective data received from the base station in the wireless communication and the wired communication. ..   The communication system according to claim 2, wherein the base station selects the data received first from the data received from the terminal station in the wireless communication and the wire communication.   The base station controls the timing of transmitting the data so that the delay time when transmitting the data in the wireless communication is the same as the delay time when transmitting the data in the wired communication. The communication system according to claim 1 or 2, characterized in that.   The terminal station controls the timing of transmitting the data so that the delay time when transmitting the data in the wireless communication and the delay time when transmitting the data in the wired communication are the same. The communication system according to claim 2, wherein:   When the base station confirms that the data has been delivered to the terminal station in each of the wireless communication and the wired communication, next time, prioritizing one of the wireless communication and the wired communication. The communication system according to claim 1, wherein the data is transmitted.   When the base station confirms that the data has been delivered to the terminal station in each of the wireless communication and the wired communication, next time, the wireless communication is prioritized to transmit the data. The communication system according to claim 1 or 2. A communication system comprising a first terminal station and a second terminal station communicatively connected to the first terminal station,
The first terminal station and the second terminal station are connected so as to be capable of wired communication, and also capable of wireless communication via a base station,
The first terminal station transmits the same data to the second terminal station in each of the wireless communication and the wired communication,
A communication system in which the second terminal station selects one of the data received from the first terminal station in the wireless communication and the wire communication. A communication system comprising a base station and a terminal station communicatively connected to the base station,
The base station and the terminal station are connected by wireless communication and wired communication,
The base station is a communication system in which the same data is transmitted to the terminal station by the wireless communication or the wired communication.   The communication system according to claim 10, wherein the base station switches to the wireless communication or the wired communication and transmits the data while the data is being transmitted by the wireless communication or the wired communication.   The base station transmits the data by the wireless communication when the wireless communication with the terminal station becomes possible while transmitting the data by the wired communication. Communication system.   The communication system according to claim 10, wherein the base station switches the wireless communication and the wired communication at regular intervals and alternately transmits the data.   The communication system according to claim 10, wherein the base station transmits the data through the predetermined wireless communication or wired communication. A communication system comprising a first terminal station and a second terminal station communicatively connected to the first terminal station,
The first terminal station and the second terminal station are connected so as to be capable of wired communication, and also capable of wireless communication via a base station,
A communication system in which the first terminal station transmits the same data to the second terminal station by the wireless communication or the wired communication. A communication system comprising a base station and a terminal station communicatively connected to the base station,
The base station and the terminal station are connected by wireless communication and wired communication,
The base station transmits wireless communication data, which is data transmitted by the wireless communication, and wired communication data, which is data transmitted by the wired communication, to the terminal station at the same time in each of the wireless communication and the wired communication. Communication system. A communication system comprising a first terminal station and a second terminal station communicatively connected to the first terminal station,
The first terminal station and the second terminal station are connected so as to be capable of wired communication, and also capable of wireless communication via a base station,
The first terminal station simultaneously transmits wireless communication data, which is data transmitted by the wireless communication, and wired communication data, which is data transmitted by the wired communication, in the wireless communication and the wired communication. A communication system that transmits to a terminal station. A communication system comprising a base station and a terminal station communicatively connected to the base station,
The base station and the terminal station are connected by wireless communication and wired communication,
The base station is configured to receive the wireless communication data and the wireless communication data, which are data to be transmitted by the wireless communication, and the wired communication data, which is data to be transmitted by the wired communication, at the same time. A communication system that controls the timing of transmitting wired communication data. A communication system comprising a first terminal station and a second terminal station communicatively connected to the first terminal station,
The first terminal station and the second terminal station are connected so as to be capable of wired communication, and also capable of wireless communication via a base station,
The first terminal station is configured so that the wireless communication data, which is data transmitted by the wireless communication, and the wired communication data, which is data transmitted by the wired communication, are received by the second terminal station at the same time. A communication system for controlling the timing of transmitting communication data and the wired communication data.

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