JPH05160831A - Communication system - Google Patents

Abstract

PURPOSE:To provide a communication system capable of multiplex communication by implementing error correction processing between opposite communication equipments in a digital communication network such as ISDN efficiently. CONSTITUTION:One side of the communication system is provided with a digital service unit 8, an ISDN radio communication adaptor 5, a radio communication equipment 3 and a non-ISDN terminal equipment 1 via an ISDN exchange station 10 in the middle. Equipment of the same configuration is arranged to the other end. In the communication system, an error caused in the ISDN is corrected not in the ISDN and not between opposite ISDN radio communication adaptors but by opposite radio communication equipment 3. Thus, the communication speed is improved and the error correction processing is simplified. Furthermore, the ISDN radio communication adaptor 5 implements the multiplex communication processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system such as ISDN, and more particularly to a digital communication system for efficiently performing communication error correction in a communication system having a wireless communication device at the end of ISDN.

[0002]

2. Description of the Related Art There are various communication systems, but IS
The development of digital communication networks such as DN is remarkable. FIG. 2 shows a configuration example of the ISDN system. The ISDN system configuration shown in FIG.
A plurality of communication systems 110, 120, and 130 are mutually connected via. The first communication system 110 is an IS
Communication terminal adapter (TA) wired to the DN100
111, a wireless communication device (RX) 112 wiredly connected to the communication terminal adapter, wireless communication devices 114 and 117 wirelessly connected to the wireless communication device 112, and a communication terminal device (TE) wirelessly connected to the wireless communication device 114. ) 115, and a communication terminal device 118 wiredly connected to the wireless communication device 117. The second communication system is a communication terminal adapter 121 wiredly connected to the ISDN 100, a wireless communication device 122 wiredly connected to this communication terminal adapter, a wireless communication device 124 wirelessly connected to this wireless communication device, and this wireless communication device. Has a communication terminal device 125 wiredly connected to. The third communication system 130 includes a communication terminal device 13 wire-connected to a communication terminal adapter 131 wire-connected to the ISDN 100.
Have two. The ISDN system also has various forms based on the CCITT recommendation, but in this example, a general communication form will be described without being specified to a particular form (model).

In the ISDN system shown in FIG. 2, it is possible to communicate with the communication terminal devices 115/118, 125, 132 at the final stages of the first to third communication systems via the ISDN 100. ISD as a communication terminal device
Terminal type 1 (TE) such as digital telephones, data terminals, and composite terminals that comply with the N I-interface recommendation
1) and the other are the terminal type 2 (TE2) that does not comply with the I interface recommendation. The terminal type 2 includes an X series interface and a V series interface. Communication terminal devices 115, 118, 12
5, 132 belong to the terminal type 2 in this example.

Communication terminal adapters 111, 121, 131
Is the communication terminal device of the terminal type 2 115, 118,
It is a conversion device for connecting the 125 and 132 to the ISDN 100 conforming to the standard I interface. The communication terminal adapters are PBX, L in addition to the connection point T of layer 1.
Although it has a connection point S point with a function corresponding to layers 2 and 3 such as AN, and an R point that enables connection with a communication terminal device that does not comply with the ISDN interface recommendation, in this example, Hereinafter, an example in which the communication terminal adapter belongs to layers 2 and 3 and the communication terminal adapter has an S point will be described. In the ISDN system configuration illustrated in FIG. 1, the communication terminal device based on the I interface recommendation is not illustrated.

The communication system generally has a function of detecting and correcting a transmission error. Although the detection and correction of the transmission error are performed in various systems and various devices, in the ISDN system illustrated in FIG. 2, the transmission error can be detected and corrected individually between the communication target devices. Has been done. As a specific example, the communication terminal device 115 belonging to the first communication system 110
When communication is performed between the communication terminal device 125 belonging to the second communication system 120 and the communication terminal device 125 belonging to the second communication system 120, the transmission error is detected and corrected at the following positions. (1) Between the communication terminal device 115 and the wireless communication device 114 (2) Between the wireless communication device 114 and the wireless communication device 112 (3) Between the wireless communication device 112 and the communication terminal adapter 111 (4) Communication terminal Between adapter 111 and ISDN 100 (5) Inside ISDN 100 (6) Between ISDN 100 and communication terminal adapter 121 (7) Between communication terminal adapter 121 and wireless communication device 122 (8) Wireless communication device 122 and wireless communication device Between the wireless communication device 124 and the communication terminal device 125 (9)

[0006]

In general, the above-described detection and correction of transmission errors are detected quickly at the place where the transmission error occurs, and the influence of the transmission error is not transmitted to the subsequent device. effective. However, there is a problem in that it takes processing time to detect and correct a transmission error, and the circuit configuration for it also becomes complicated. In particular, when a large number of communication devices perform complicated communication, as in the ISDN system, a problem occurs that a considerable transmission time delay occurs due to the detection and correction of the transmission error. In particular, we encounter the problem of increasing the burden of detecting and correcting transmission errors as the amount of information to be transmitted increases. The above problem is I
The problem is not limited to the SDN system but also occurs in a normal communication system.

The above-mentioned ISDN communication system is basically based on one-to-one opposite communication, and there is a problem that the use of a plurality of channels, which is a characteristic of ISDN, cannot be effectively utilized.

[0008]

In order to solve the above problems, in the present invention, the data transmission protocol is performed only between the opposing wireless communication devices, the transmission protocol in other devices is omitted, and the wireless communication section is further omitted. Then, logical multiple paths based on time division multiplexing are provided. Therefore, according to the first aspect of the present invention, on one side of the signal transmission network, a first wireless communication adapter device wire-connected to the signal communication network and a first wireless communication adapter device wirelessly connected to the wireless communication adapter device are provided. A wireless communication device and a first terminal device wire-connected to the wireless communication device, and a second wireless communication adapter device wire-connected to the signal communication network on the other side of the signal transmission network and the wireless communication device. A second wireless communication device wirelessly connected to the communication adapter device and a second terminal device wiredly connected to the wireless communication device, and a mutual communication error occurs only in the first and second wireless communication devices. There is provided a communication method characterized by being configured to perform a correction process. According to the second aspect of the present invention, the first wireless communication adapter device wiredly connected to the signal communication network and the first wireless connection adapter wirelessly connected to the signal communication network are provided on one side of the signal transmission network. A wireless communication device and a first terminal device wire-connected to the wireless communication device, and a second wireless communication adapter device wire-connected to the signal communication network on the other side of the signal transmission network and the wireless communication device. A second wireless communication device wirelessly connected to the communication adapter device and a second terminal device wiredly connected to the wireless communication device are provided, and multiplex communication processing is performed in the first and second wireless communication adapter devices. There is provided a communication method characterized by being configured to perform. Furthermore, according to the present invention, it is possible to provide a communication system in which the first and second modes are combined.
Preferably, the signal transmission network is ISDN and the first
And the second wireless communication adapter device is ISDN, respectively.
There is provided a communication system that is a wireless communication adapter device and performs ISDN communication without error correction between the ISDN wireless communication adapter devices via the ISDN. Further, it is possible to provide a communication method for performing packet communication between the first ISDN wireless communication adapter device and the first wireless communication device.

[0009]

In the first embodiment of the present invention, the transmission error is detected and corrected based on the existing data transmission protocol for the wireless communication only in the wireless communication section. In other places, the detection and correction of the transmission error are not performed, so that the processing time of the communication method required for this processing is shortened. In the second embodiment of the present invention, the wireless communication adapter device performs multiplex communication processing. As a result, the devices connected to these wireless communication adapter devices can perform multiplex communication.

[0010]

FIG. 1 shows the configuration of a communication system associated with an ISDN communication system (system) as an embodiment of the communication system (system) of the present invention. Regarding the ISDN communication system configuration shown in FIG. 1, the items common to the ISDN system shown in FIG. 2 are also applied to this embodiment. That is, the basic items such as the communication terminal adapter connected to the ISDN 100 and the communication terminal device connected to this communication terminal adapter are the same in this embodiment.

The ISDN communication system illustrated in FIG.
An ISDN exchange station 10 is arranged in the center, and a digital service unit 8 is provided on one side of the ISDN exchange station 10, and an ISDN wireless communication adapter device 5 shown as a communication terminal adapter TA in FIG.
The wireless communication device 3 and the non-ISDN terminal device 1 shown as a communication terminal device not conforming to the I interface recommendation in FIG. 2 are provided as shown in the drawing. Devices corresponding to the devices 1, 3, 5 and 8 are also provided on the other side of the ISDN exchange station 10, but they are omitted for the sake of illustration.

The non-ISDN terminal device 1 in the ISDN communication system shown in FIG. 1 has a communication system which does not comply with the ISDN protocol (communication protocol), for example, RS.
2 shows a terminal device that communicates with an asynchronous protocol compliant with 232C. The non-ISDN terminal device 1 is connected to a wireless communication device 3 as a wireless relay device connected by ISDN which is a wired system. The wireless communication device 3 also communicates with a protocol that does not conform to the ISDN standard protocol. An ISDN wireless communication adapter device 5 is provided in order to adapt this non-ISDN protocol to the ISDN protocol and to adapt the wireless communication to the wired communication. The digital service unit 8 is arranged between the ISDN wireless communication adapter device 5 and the ISDN exchange station 10, and converts a signal from the ISDN exchange station 10 into a 2-line ISDN cable 9 into a signal from a 4-line S interface line 7. To do.

The wireless communication device 3 includes a digital transmission protocol control unit 31, a self error correction unit 32, and a wireless communication unit 3
3 and antenna 34 are constructed as shown. The antenna 34 and the wireless communication unit 33 perform wireless communication with the opposing ISDN wireless communication adapter device 5 via the wireless communication space 4. The self-error correction unit 32 will be described later.

The ISDN wireless communication adapter device 5 includes an antenna 51, a wireless communication unit 52, a self error correction unit 53, a channel multiplexer 54, and an S interface circuit 5.
5 and the call control unit 56 are configured as shown.
Both the channel multiplexer 54 and the S interface circuit 55 have a B of a transmission rate of 64 Kbit / sec.
They are connected by a 1-channel line 61 and a B2-channel line 62. In addition, the S interface circuit 55 and the call control unit 5
6 is connected to the D channel line 63 with a transmission rate of 16 Kbit / sec. Further, a call control line line 64 is connected between the call control unit 56 and the channel multiplexer 54. The S interface circuit 55 has an S point 59
It is connected to the S interface line 7 via the, and is connected to the digital service unit 8. The ISDN wireless communication adapter device 5 and the lower wireless communication device 3 are non-ISD
ISDN exchange 10 while communicating wirelessly by N protocol
Wire communication is performed according to the ISDN protocol.

The digital transmission protocol control unit 31 in the wireless communication device 3 transmits the digital data via the cable 2 according to the non-ISDN terminal device 1 and non-ISDN protocol, in this embodiment, the RS-232C transmission / reception protocol. Communicate. As a result, non-ISDN
The transmission data from the terminal device 1 is sent to the digital transmission protocol control unit 31 in the wireless communication device 3 and protocol processing is performed. This protocol is based on ISDN exchange 1.
It is also a protocol performed between devices corresponding to the non-ISDN terminal device 1 and the wireless communication device 3 (not shown), which are disposed at positions facing each other via 0 and communicate with the non-ISDN terminal device 1.

The transmission data subjected to the protocol processing in the digital transmission protocol control unit 31 is input to the self error correction unit 32. The self-error correction in the self-error correction unit 32 is performed by the ISDN facing the wireless communication device 3.
This is performed in order to minimize transmission errors in the wireless communication space 4 with the self-error correction unit 53 in the wireless communication adapter device 5. The self-error-corrected transmission data is input to the wireless communication unit 33. The transmission data input to the wireless communication unit 33 is subjected to predetermined modulation for wireless communication, and is radiated to the wireless communication space 4 via the antenna 34.

The transmission data radiated to the wireless communication space 4 is received by the antenna 51 of the ISDN wireless communication adapter device 5, and the wireless communication unit 52 performs a predetermined demodulation process. The demodulated data is input to the self-error correction unit 53, self-error correction is performed, and transmission error is suppressed. The demodulated data is input to the channel multiplexer 54, and the B1 channel B1 channel line 61 and the B2 channel B2 channel line 6 corresponding to each logical channel are input.
2 or call control line 64 divided into data.
The data on the B1 channel line 61 and the B2 channel line 62 are input to the S interface circuit 55. The data on the call control line 64 is input to the call control unit 56.

The call controller 56 controls calling / calling with the ISDN exchange 10. The call control data is input to the S interface circuit 55 via the D channel line 63. B1 channel line 6 input to the S interface circuit 55
The data of the 1, B2 channel line 62 and the D channel line 63 are multiplexed in the S interface circuit 55,
It is input to the digital service unit 8 via the 4-line S interface line 7 and reaches the ISDN exchange station 10 via the ISDN cable 9.

As described above, the ISDN cable 9, the digital service unit 8, the S interface line 7, the ISDN wireless communication adapter device 5, the wireless communication space 4, the wireless communication device 3, the cable 2, are provided on the other side of the ISDN exchange station 10. Also, a system corresponding to the non-ISDN terminal device 1 is provided, and the reverse operation of the above-described operation is performed.

First, from the non-ISDN terminal device 1 to the ISDN
A call setting command for the call control unit 56 in the wireless communication adapter device 5, for example, CCITT recommendation V25bis
Command is sent to establish a call with the other communication terminal equipment corresponding to the ISDN exchange 10 and the non-ISDN terminal equipment 1, and the logical multiplexer is allocated in the channel multiplexer 54, and then the B1 channel line 61
It is possible to transmit the transmission data via the B2 channel line 62. Since this data transmission is divided into packets according to the data transmission protocol, a plurality of wireless communication devices are arranged in the wireless communication space 4 and the wireless communication space of the other party corresponding to this wireless communication space 4 to perform time division multiplexing. A plurality of links can be formed based on the communication system or the frequency multiplexing communication system. As a result, multiple simultaneous communication using multiple channels becomes possible.

Further, the non-ISDN terminal device 1 and the communication terminal device corresponding to the non-ISDN terminal device 1 facing each other via the ISDN exchange 10 are not ISDN wireless communication adapters such as the above-mentioned ISDN wireless communication adapter device 5. Also, if a data transmission protocol equivalent to the digital transmission protocol control unit 31 of the wireless communication device 3 is installed,
The same data transmission as the above-mentioned data transmission becomes possible.

The self-error correction unit 32 in the wireless communication device 3
Since the self-error correction unit 53 in the ISDN wireless communication adapter device 5 suppresses the transmission error in the wireless communication space 4 as much as possible, it can be deleted when the communication system of the present invention is realized. As described above, in the ISDN communication system illustrated in FIG. 1, the data transmission error in the wireless communication space 4 where the transmission error is most likely to occur is detected using the existing wireless communication unit 33 and wireless communication unit 52. Since the detection and correction of the transmission error are not performed in other parts, the time required for detecting and correcting the transmission error can be remarkably shortened.

The communication system of the present invention is not limited to the above-mentioned embodiment, and as described above, it can be applied to other communication systems for connecting communication terminal devices to each other via a wireless communication device.

[0024]

As described above, according to the communication system of the present invention, simultaneous communication for multiple channels becomes possible.
Further, according to the present invention, the time required for detecting and correcting a transmission error can be greatly shortened, and the transmission efficiency of the communication network can be substantially improved.

[Brief description of drawings]

FIG. 1 is a partial configuration diagram of an embodiment of a communication system of the present invention.

FIG. 2 is an example of an IS to which the communication system of the present invention is applied.
It is a block diagram of a DN system.

[Explanation of symbols]

1 ・ ・ Non-ISDN terminal device, 2 ・ ・ Cable, 3 ・ ・ Wireless communication device, 4 ・ ・ Wireless communication space, 5 ・ ・ ISDN wireless communication adapter device, 7 ・ ・ S interface line, 8 ・
· Digital service unit, 9 · · ISDN cable, 10 · · ISDN exchange, 31 · · Digital transmission protocol control unit, 32 · · Self-error correction unit, 33 ·
・ Wireless communication part, 34 ・ ・ antenna, 51 ・ ・ antenna,
52 ... Wireless communication unit, 53 ... Self-error correction unit, 54
..Channel multiplexer, 55..S interface circuit, 56..Call control unit, 59..S point, 61 ..
B1 channel line, 62 ... B2 channel line, 63 ... D
Channel line, 64 ... Call control line.

Claims (5)

[Claims] 1. A first wireless communication adapter device wire-connected to the signal communication network on one side of the signal transmission network, a first wireless communication device wirelessly connected to the wireless communication adapter device, and the wireless communication device. A first terminal device wiredly connected to the communication device, and a second wireless communication adapter device wiredly connected to the signal communication network and wirelessly connected to the wireless communication adapter device on the other side of the signal transmission network. A second wireless communication device and a second terminal device wiredly connected to the wireless communication device, and configured to perform mutual communication error correction processing only in the first and second wireless communication devices. A communication method characterized in that 2. A first wireless communication adapter device wire-connected to the signal communication network on one side of the signal transmission network, a first wireless communication device wirelessly connected to the wireless communication adapter device, and the wireless communication device. A first terminal device wiredly connected to the communication device, and a second wireless communication adapter device wiredly connected to the signal communication network and wirelessly connected to the wireless communication adapter device on the other side of the signal transmission network. A second wireless communication device and a second terminal device wiredly connected to the wireless communication device, and configured to perform multiplex communication processing in the first and second wireless communication adapter devices. Characteristic communication method. 3. The communication method according to claim 2, wherein mutual communication error correction processing is performed only in the first and second wireless communication devices. 4. The signal transmission network is ISDN, the first and second wireless communication adapter devices are ISDN wireless communication adapter devices, respectively, and an error occurs between these ISDN wireless communication adapter devices via the ISDN. 4. The communication system according to claim 3, wherein ISDN communication is performed without correction. 5. The communication system according to claim 4, wherein packet communication is performed between the first ISDN wireless communication adapter device and the first wireless communication device.