JP2014087025A - Relay device and communication system - Google Patents

Abstract

The present invention provides a relay device and a communication system capable of reflecting selective call information transmitted by a radio device together with a voice signal to relay using a network.
A relay device is a network that transmits and receives packets between a radio interface that receives a voice signal including call information from a slave unit and another network device that is connected to the network and connected to the network. When a voice signal is input from the interface and the radio interface, the address information of the network device that relays communication with the communication partner specified by the call information included in the voice signal is determined, and the voice information is sent to the address information as the destination. A control unit that creates a packet including a signal and inputs the packet to a network interface.
[Selection] Figure 1

Description

  The present invention relates to a relay apparatus and a communication system for relaying communication between a radio and a telephone via a network.

  Some transceivers have a designated call function such as an individual call for individually specifying a communication partner or a group call for specifying a group (for example, see Patent Document 1). On the other hand, a relay device has also been proposed that relays communication over a network such as a LAN so that transceivers in areas where radio waves do not reach each other can communicate with each other (see, for example, Patent Document 2).

JP 2006-129204 A

JP 2011-135291 A

  However, since the conventional relay device only transmits the voice signal received from the transceiver by multicast, the designated call information is not reflected even in the designated call communication, and all the transceivers that can communicate via the network There was a problem of being heard.

  It is an object of the present invention to provide a relay device and a communication system that can reflect designated call information transmitted by a wireless device together with a voice signal to a relay using a network.

  The relay apparatus of the present invention is connected to a relay radio, and receives a voice signal including call information for designating a communication partner from a slave unit communicating with the relay radio via the relay radio. An audio signal is input from a radio interface and a network interface that is connected to a network that is a data communication network and transmits / receives packets to / from other network devices connected to the network. The address information of the network device that relays communication with the communication partner specified by the call information included in the voice signal is determined, and a packet including the voice signal is created using the address information as a destination to the network interface. And an input control unit.

  In the present invention, when a voice signal including call information is sent from the slave unit, address information is determined based on the call information, a packet (for example, an RTP packet) having the address information as a destination is created, and the voice signal is generated. Transmit on the network. As a result, the voice signal can reach only the network device that relays the communication with the communication partner, and the call information can be reflected in the network communication.

  In the above invention, a table in which the call information is associated with address information of a network device that relays communication with a communication partner specified by the call information is provided in the control unit, and the voice signal is input. At this time, this table may be searched to determine the address information as the destination.

  In the above invention, the address information may be an IP address of the network device and a port number for packet transmission / reception in the network device.

  In the above invention, the radio interface may transmit and receive the audio signal by packet communication with the relay radio.

  In the above invention, when the control unit receives a packet including an audio signal from the network interface, the control unit reads the audio signal from the packet and transmits the packet to the relay radio via the radio interface. You may do it.

  The communication system of the present invention includes the relay device, a relay radio device connected to the relay device, and a slave unit that wirelessly communicates with the relay radio device in each of three or more communication areas. The relay devices in the area are connected to each other by a network, and the slave unit in the first communication area transmits a voice signal including call information specifying a slave unit in any one of the other communication areas. The relay radio device in the communication area receives the audio signal transmitted from the slave device in the first communication area and inputs it to the relay device in the first communication area, and the relay device in the first communication area. Inputs the voice signal, determines which other communication area of the call information included in the voice signal is specified, and relays the calculated communication area including the voice signal. Device address information Create a packet whose destination is characterized by sending to the network.

  According to the present invention, since the destination address of the packet is determined based on the call information, the designated call information transmitted together with the voice signal by the wireless device can be reflected in the relay using the network.

It is a block diagram of the communication system which is embodiment of this invention. It is a figure which shows the memory content of the radio | wireless machine which is a subunit | mobile_unit. It is a block diagram of the relay apparatus of a communication system. It is a figure which shows the memory content of the memory | storage part of a relay apparatus. It is a figure which shows the structure of a RTP packet. It is a flowchart which shows operation | movement of a relay apparatus.

A relay device and a communication system of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a communication system according to an embodiment of the present invention. This communication system is a system that enables communication between transceivers 4 (4A, 4B, 4C) existing in different communication areas A to C using a plurality of relay apparatuses 2 connected to each other via a network 1. .

  As the network 1, for example, a LAN configured by Ethernet (registered trademark) or the Internet can be applied. One or a plurality (three in FIG. 1) of relay apparatuses 2 are connected to the network 1. Each relay device 2 (2A, 2B, 2C) covers different communication areas A, B, C, respectively. A stationary transceiver is connected to each relay device 2 as a relay transceiver 3 (3A, 3B, 3C). The relay transceiver 3 may be a so-called push-to-talk (PTT) half-duplex communication device or a full-duplex communication device capable of transmitting and receiving simultaneously. One or a plurality (two in FIG. 1) of transceivers 4 (4A-1, 2, 4B, 4C) exist in the communication area of each relay transceiver 3. The relay transceiver 3 and the transceiver 4 can communicate with each other. The relay transceiver 3 (master device) corresponds to the relay radio device of the present invention, and the transceiver 4 (slave device) corresponds to the slave device of the present invention.

  The transceiver 4 and the relay transceiver 3 are so-called digital transceivers. The digital transceiver can communicate audio signals and data converted into digital signals, and can simultaneously communicate control information such as destination information in parallel with audio signal communication. The relay transceiver 3 packetizes the digital signal received from the transceiver 4 and inputs the packet to the relay device 2. The relay transceiver 3 extracts the voice signal and control information from the packet input from the relay device 2. Convert to digital signal of axis and send.

  As shown in FIG. 2, the transceiver 4 stores an ID (radio device identification information) for identifying the own station and a group number to which the own station belongs, and the received digital signal includes destination information as destination information. If the ID or the group number to which the own station belongs is embedded, this signal is demodulated and an audio signal is output from a speaker or the like. If the received digital signal is not embedded with the ID of the own station or the group number to which the own station belongs, the digital signal is discarded. The ID of the own station and the group number to which the own station belongs are inserted, for example, as a squelch code in the received audio signal.

  FIG. 3 is a block diagram of the relay device 2. FIG. 4 is a diagram illustrating a configuration of the storage unit 24 of the relay device 2. FIG. 5 is a configuration diagram of an RTP (Real-time Transport Protocol) packet.

  The relay device 2 includes a control unit 20 and includes a radio interface 21 at the downstream (relay transceiver 3 side) end and a network interface 22 at the upstream (network 1 side) end. For example, an Ethernet (registered trademark) physical layer connector can be applied to both the radio interface 21 and the network interface 22 and is in charge of the physical layer and data link layer of digital communication.

  The radio interface 21 inputs the uplink packet input from the relay transceiver 3 to the control unit 20 and transmits the downlink packet input from the control unit 20 to the relay transceiver 3. The network interface 22 inputs a downstream packet, which is a packet from a communication partner received via the network 1, to the control unit 20 and sends an upstream packet input from the control unit 20 to the network 1.

  The control unit 20 includes a microcomputer and functionally includes a storage unit 24, an upstream signal processing unit 25, and a downstream signal processing unit 26. In the storage unit 24, a local station IP address storage area 200, a communication port number storage area 201, and a destination management table 203 shown in FIG. 4 are set.

  The destination management table 203 set in the storage unit 24 is a call information that is destination information included in a voice packet input from the relay transceiver 3, that is, a voice signal transmitted by the transceiver 4 communicating with the relay transceiver 3. Is a table for determining the IP address and port number of another relay apparatus 2 that is the destination of the voice packet. That is, in the destination management table 203, as call information for calling a predetermined transceiver 4, an ID type (type of call is a group call or an individual call) and an ID of the call are stored. Correspondingly, the IP address and port number of another relay apparatus 2 that covers the communication area to which the transceiver 4 called by this call information belongs are stored. When the CODEC of the voice signal of the voice packet is converted into the format input from the relay transceiver 3, the destination CODEC method is also stored in the destination management table 203.

  The upstream packet processing unit 25 performs upstream CODEC conversion and format conversion on the upstream voice packet input from the radio interface 21 and transfers the packet to the network interface 22. The voice signal of the voice packet input from the relay transceiver 3 is, for example, G.P. It is encoded by a method such as 711 or AMBE. Note that the upstream packet processing unit 25 is able to apply this to G.P. 726 or G.I. It may be converted into an encoding method such as 729.

  At this time, the uplink packet processing unit 25 reads the call information embedded in the uplink voice packet, searches the destination management table 203 with the call information, and reads the corresponding IP address and port number. Then, by the format conversion, the read IP address is written as the destination address in the IP header of the RTP packet configured as shown in FIG. 5, and the read port number is written as the destination port number in the UDP header. The IP address of the relay device 2 is written in the source IP address column of the IP header, and the port number used in the relay device 2 is written in the source port number column of the UDP header. . Subsequently to the RTP payload (as part of the RTP payload), the call information embedded in the voice packet and the caller ID (the ID of the transceiver 4 that transmitted the voice signal) are written.

  The downlink packet processing unit 26 performs CODEC conversion and format conversion on the RTP packet input from the network interface 22 and transfers the RTP packet to the radio interface 21. In contrast to the upstream packet processing unit 25, the CODEC conversion is performed in the G. 726, G.G. An audio signal encoded by a method such as G.729 is used for G.729. It is converted into an encoding method such as 711 or AMBE. Further, the call information (ID type and ID) written in the RTP packet is read out and written in the voice packet transmitted to and received from the relay transceiver 3.

  When the relay transceiver 3 performs half-duplex communication, when a voice packet is input from the relay device 2, the PTT switch is turned on on the condition that the transmission radio wave from the transceiver 4 is stopped, and the voice packet is transmitted. The contained voice signal and call information are converted into a continuous digital signal, and the carrier signal is digitally modulated with this digital signal and transmitted.

The operation of the relay device 2 when receiving a packet will be described with reference to the flowchart of FIG.
FIG. 6A is a flowchart showing an operation when an uplink voice packet is input from the radio interface 21 (relay transceiver 3). When a voice packet is input (S10), it is determined whether or not call information is included in this packet (S11). If the call information is not included (NO in S11), the voice packet is converted into a multicast RTP packet and sent to the network interface 22 as a whole call.

  If the call information is included in the voice packet (YES in S11), the call information is read (S12), the destination management table 203 is searched with the read call information, and the destination IP address and port number are read. (S13). Then, an RTP packet as shown in FIG. 5 is created with this IP address and port number as the destination IP address and destination port number (S14). As described above, call information is also written in this RTP packet. The created RTP packet is sent to the network interface 22 (S15). The network interface 22 transmits this RTP packet. Since a specific destination IP address is written in this RTP packet, the RTP packet is transmitted to the relay device 2 of the destination IP address by unicast.

  Thus, the IP address (including the port number) corresponding to the call information embedded in the voice signal is stored in the destination management table 203, and when the voice signal (voice packet) is input, the destination management table 203 is stored. By using this and determining the destination IP address of the audio signal, the packet can be transferred to the correct relay destination even when there are a plurality of relay destinations (relay apparatuses 2) via the network 1.

  Further, by writing call information in an IP packet (RTP packet) and transmitting it, even if communication of the transceiver 4 is relayed through the network 1, a selective call (individual call or group call) is made to the relay destination transceiver 4. It becomes possible.

  FIG. 6B is a flowchart showing the operation when a downstream RTP packet is input from the other relay apparatus 2 via the network interface 22, that is, the network 1. When an RTP packet is input (S20), it is determined whether or not call information is included in this packet (S21). If the call information is not included (NO in S21), the RTP packet is converted into a voice packet for the entire call and transmitted to the radio interface 21 as a whole call.

  If the received RTP packet includes call information (YES in S21), this call information is read (S22), and the RTP packet is converted into a voice packet embedded with the read call information (S23). The data is sent to the radio interface 21 (S24). The radio interface 21 inputs this voice packet to the relay transceiver 3.

  When performing full-duplex communication, the relay transceiver 3 converts a voice signal and call information included in the voice packet into a continuous digital signal, and digitally modulates the carrier signal with the digital signal and transmits the digital signal. When the relay transceiver 3 performs half-duplex half-duplex communication, transmission is performed by turning on the PTT switch on condition that the transmission radio wave from the transceiver 4 is stopped.

  In the above embodiment, transmission / reception of the audio signal between the relay transceiver 3 and the relay device 2 is performed by a packet, but may be performed by a digitized time axis signal or an analog signal. In any case, the call information may be superimposed (embedded) in some manner.

1 Network 2 Relay Device 3 Relay Transceiver (Master Unit)
4 Transceiver (slave unit)

Claims (6)

A radio interface for receiving a voice signal including call information for designating a communication partner from a slave unit connected to the relay radio unit and communicating with the relay radio unit via the relay radio unit;
A network interface that is connected to a network that is a data communication network and that transmits and receives packets to and from other network devices connected to the network;
When a voice signal is input from the radio interface, address information of a network device that relays communication with a communication partner specified by call information included in the voice signal is determined, and the address signal is used as the destination. A control unit that creates a packet including the input to the network interface;
A relay device comprising: The control unit has a table in which the call information is associated with address information of a network device that relays communication with a communication partner specified by the call information,
The relay apparatus according to claim 1, wherein when the voice signal is input, the table is searched to determine address information as the destination.   The relay apparatus according to claim 1, wherein the address information is an IP address of the network device and a port number for packet transmission / reception in the network device.   The relay apparatus according to any one of claims 1 to 3, wherein the radio interface transmits and receives the audio signal by packet communication with the relay radio.   The control unit, when receiving a packet including an audio signal from the network interface, reads out the audio signal from the packet and transmits the packet to the relay radio via the radio interface. 5. The relay device according to any one of 4. The relay device according to any one of claims 1 to 5, a relay radio device connected to the relay device, and a slave device that performs radio communication with the relay radio device in each of three or more communication areas With
The relay devices in each communication area are connected to each other by a network,
The handset in the first communication area transmits a voice signal including call information that specifies the handset in any other communication area,
The relay radio in the first communication area receives the audio signal transmitted by the slave in the first communication area and inputs it to the relay device in the first communication area;
The relay device of the first communication area receives the voice signal, determines which other communication area of the call information included in the voice signal specifies the slave unit, and includes the voice signal. A communication system that creates a packet addressed to address information of a relay device in the determined communication area and sends the packet to the network.

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