JP3082961B2 - Interface device between spread spectrum communication equipment and terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interface device for connecting a spread spectrum communication device to a terminal.

[0002]

2. Description of the Related Art Conventionally, an interface for connecting a spread spectrum (SS) communication system to a digital circuit network is:
As shown in FIG. 5, a physical interface conforming to the physical layer standard and a FIFO (first-in-first-out memory) for performing rate conversion in order to correspond to various data rates, and an NPT (non-packet type terminal) are supported. It is composed of PAD.

[0003]

However, in the above conventional example, since data is transmitted and received in a packet form between the line and the terminal, there are the following disadvantages.

Normally, if a link level connection is made between the line and the terminal after the power is turned on, the connection is maintained until the power is turned off.
Even if there is no data at the packet level, it remains connected at the link level, and even if there is no actual data,
The SS communication section is always connected. Therefore, only one terminal can be connected to one line.
The configuration of AN (Local Area Network) could not be taken.

In addition, the number of terminals that can be used in a specific area is the same as the maximum number of simultaneous callers in SS communication, so that effective use of radio waves cannot be achieved.

Further, since the SS communication section is not cut, the transmission power on the mobile station side cannot be cut off, power saving is impossible, and battery driving is difficult.

[0007]

According to the present invention, when there is no data at the packet level, the above spread spectrum communication section is cut off while the above link is connected, and when the spread spectrum communication section is cut off. When packet-level data is received from the terminal, the terminal waits by outputting a non-receivable packet to the terminal, a spread spectrum communication section is connected, and the packet-level data received from the terminal is When output to the packet switching network, the terminal outputs a reception enable packet to permit data communication from the terminal.

[0008]

1 is a system configuration diagram of an embodiment of the present invention. FIG. 1A shows a digital packet switching network 4, SS (spread spectrum) communication devices 1, 2 and a packet type terminal (hereinafter, PT) 3. It is a connection diagram, (B) is a block diagram of the SS communication device 1 on the line connection side (hereinafter, base), and (C) is a block diagram of the SS communication device 2 on the terminal connection side (hereinafter, mobile). .

In FIG. 1, reference numerals 11 and 21 denote physical interfaces composed of standard connectors and driver receivers. Blocks 12 and 22 have functions of assembling and disassembling a packet (hereinafter referred to as PAD). 13,
23 is a control circuit for controlling the operation of the interface.

Reference numerals 14 and 24 denote buffer memories for converting the internal data rates of the SS communication devices 1 and 2, respectively. 1
Reference numerals 5 and 26 denote SS interfaces for converting a packet exchange network protocol (hereafter, CCITTX.25 will be described as an example) into an SS internal protocol. Reference numerals 16 and 27 denote SS transmitting / receiving circuits for performing SS communication. 25 is a non-packet type terminal (hereinafter NPT)
Is a physical interface composed of a standard (for example, RS232C) connector for connecting to a PC and a driver receiver. The specific operation will be described below.

First, when the power is turned on, the clock 301 is supplied from the digital packet exchange network 4 to the physical interface 11 of the base SS communication device 1. When the clock 301 is supplied, the PAD function block 12 supplies the clock 301 to the control circuit 13 and outputs a clock supply signal. The control circuit 13 having received this outputs a synchronization pattern output instruction signal to the SS interface 15, outputs a transmitter ON signal of the SS transmission / reception circuit 16, and waits for a synchronization establishment signal 306 from the SS interface 15. .

The SS interface 15 receiving the clock supply signal outputs a synchronization pattern 302 to the SS transmitting / receiving circuit 27 and waits for a reception signal. And Mobile S
When the synchronization is received by receiving the synchronization pattern 303 from the S communication device 2, the SS interface 15 transmits a synchronization confirmation signal 304 to the mobile SS communication device 2 and waits for the synchronization confirmation signal 305. Upon receiving the synchronization confirmation signal 305, the SS interface 15 outputs a synchronization establishment signal 306 to the control circuit 13.

The control circuit 15 receiving this outputs a physical layer connection instruction signal to the PAD function block 12,
Complete the physical level connection.

As an initial operation of the mobile SS communication device 2,
When the power is turned on, first, the control circuit 23 sends out a clock and a synchronization pattern to the SS interface 26, and then outputs a transmitter ON signal to the SS transmission / reception circuit 27, and outputs the synchronization signal from the SS interface 26. Wait for the establishment signal.

The SS interface 26 that has received the synchronization signal from the control circuit 23 waits for a reception signal from the base SS communication device 1. Then, when the synchronization pattern 302 is received from the base SS communication device 1 and the synchronization of the SS section is performed, the synchronization pattern 303 is transmitted and the synchronization confirmation signal 304 is transmitted in the same manner as the initial operation of the base SS communication device 1. Wait for.

When receiving the synchronization confirmation signal 304, the SS interface 26 outputs a synchronization establishment signal 307 to the control circuit 23. Upon receiving this, the control circuit 23 sets P
The clock is supplied to the AD function block 22, and then a physical layer connection instruction signal is transmitted. In contrast, PAD
The function block 22 first includes the physical interface 21
After the clock is supplied to, the physical level connection procedure (procedure conforming to the CCITT standard) is performed to complete the physical level connection.

When the connection at the physical level is made, the PT
3 is SABM (SetAsynchronous B)
An advanced mode signal 308 is transmitted, and the process proceeds to a link connection operation procedure. Upon receiving the SABM 308, the PAD function block 22 decomposes the frame and stores it in the buffer memory 24 as data.
A transmission request is issued to the control circuit 23. The control circuit 23 which has received the instruction outputs a transmission instruction to the SS interface 26, and transmits the data in the buffer memory 24.

The SS interface 15 is a mobile S
The received data from the S communicator 2 is determined, and if data (at this time, SABM data) is present, the data is stored in the buffer memory 14 and a received data extraction request is output to the control circuit 13. On the other hand, when there is no signal, the flag sequence is received and is not stored in the buffer memory 14. The control circuit 13 which has received the withdrawal request signal sends the PAD
A data extraction signal is output to the function block 12, and S
The ABM 309 is output to the digital packet switching network 4.

When the digital packet exchange network 4 receives the SABM 309, when the link is connectable, the digital packet switching network 4 executes UA (Unnn).
A numbered acknowledgment 310 is output to the base SS communication device 1. PA receiving this
The D function block 12 operates the mobile SS communication device 2 in the same manner as the link level connection operation procedure of the mobile SS communication device 2.
The UA 310 sends data 312 to the communication device 2,
A link connection end signal is output to the control circuit 13. In response to this link connection completion signal, the control circuit 13 starts an internal timer and waits for reception of an I (Information) frame (packet level connection signal).

The mobile SS communication device 2 that has received the data 312 outputs the UA 313 to the PT 3 in the same procedure as the SABM 309 reception operation of the base SS communication device 1. Then, as described above, the control circuit 23 receives the link connection end signal from the PAD function block 22, starts the internal timer, and waits for the reception of the I frame.

If no I-frame is received before the internal timers of the control circuits 13 and 23 overflow, the control circuits 13 and 23 send a transmission power off signal to the SS transmission / reception circuits 16 and 27, respectively. 314, 31
5 is output, transmission in the SS section is stopped, and I frame reception is waited.

Thereafter, when an I frame (for example, CR (call request) 316) is received, the I frame receiving side (for example, the mobile S
S communication device 2) PAD function block 22 to control circuit 2
3, a packet reception signal is output, and then a CC (connection completed) packet 317 is output to PT3.

The control circuit 23 which has received the packet reception signal
Is the SS transmission ON signal 31 to the SS transmission / reception circuit 27.
After outputting 8, the synchronization pattern output instruction signal is output to the SS interface 26, and the synchronization establishment signal 319 is awaited. Until the synchronization establishment signal 319 is received, the control circuit 23 issues an RNR (unreceivable) packet output instruction to the PAD function block 22, and waits for data reception from the PT3.

Base SS receiving synchronization pattern 302
The SS interface 15 of the communication device 1 includes a control circuit 13
Outputs a data reception signal. With this signal, the control circuit 13 outputs an SS transmission ON signal to the SS transmission / reception circuit 16, then outputs a synchronization pattern output instruction signal to the SS interface 15, and waits for a synchronization establishment signal 320.

Synchronization between the two SS communication devices 1 and 2 is established,
When the synchronization establishment signals 319 and 320 are input to the control circuits 13 and 23, the control circuit 23 on the calling side (mobile SS communication device 2 side) instructs the SS interface 26 to connect including the parameters in the CR packet. The signal 321 is output and output to the base SS communication device 1. The SS interface 15 having received the connection instruction signal 321 sends the connection instruction signal to the control circuit 13 and stores the parameters in the CR packet into the buffer memory 14.
Upon receiving this signal, the control circuit 13 issues a CR packet output instruction (connection signal) 322 to the PAD function block 13, causes the digital packet network 4 to transmit the CR packet 323, and waits for the reception of the CC packet 324.

When the control circuit 13 receives the CC packet reception signal from the PAD function block 12, it issues a connection completion signal transmission instruction to the SS interface 15 to notify the completion of the packet level connection. Upon receiving the connection completion signal 325, the control circuit 23 of the mobile SS communication device 2
An RR (receivable) packet output instruction is issued to the AD function block 22 to permit data communication from the PT3.
When the connection of the packet level (call) is completed, the PAD function blocks 12 and 22 transmit and receive the packet data, and also perform the CQ (recovery request) packet, the CI (disconnection instruction) packet, the SQ (restart request) packet, and the SI.
(Restart instruction) Monitors packets related to release of calls such as packets. If a packet related to the release of the call (for example, CQ packet 326) is received and the call is disconnected by the CF (disconnection confirmation) packet 327, the PAD function blocks 12 and 22 respectively control the control circuit 1.
A packet level disconnection signal is output to 3, 23.

The control circuits 13 and 23 receiving this signal turn on the internal timer and instruct the monitoring of the received frame at the link level. If an I frame (for example, a CQ packet) is received again before the internal timer overflows, the above-described packet level connection procedure is performed to perform a call connection operation. By the time the internal timer overflows, the I-frame or DISC (Disc
When no (connect) command is received, the control circuits 13 and 23 send the SS transmission / reception circuits 16 and 27 to
It outputs S transmission off signals 328 and 329, and then outputs link holding signals to the PAD function blocks 12 and 22, respectively.

This signal causes the PAD function block 1
2, 22, T ₃ timer RR in (link level operation check timer) set time (RceiveReady)
Outputs command / response and keeps link. Then, during this period, another frame (for example, CR
When a packet is received, a resynchronization operation in the SS section is performed similarly to the above, and then a transition is made to an operation mode corresponding to the received frame.

If the DISC command 330 is received before the internal timers of the control circuits 13 and 23 overflow, the internal timers of the control circuits 13 and 23 are turned off.
After the reset, the link disconnection procedure operation is performed, and the transmission of the SS communication devices 1 and 2 is cut off.

As described above, in this embodiment, the interface has the line connection protocol and the layer protocol above it, and when data communication is not performed in the upper layer, the transmission power of the spread spectrum communication section Off so that only the lower layer remains connected.

That is, when there is no data at the packet level, the spread spectrum transmitting / receiving circuits 16 and 27 disconnect the spectrum communication section while the physical interfaces 11 and 21 of the spread spectrum communication devices 1 and 2 are connected.

In the present embodiment, the description has been made with the configuration of one facing, but the present invention is not limited to such a configuration. For example, in the case of an application such as an MHS (message handling system), even one cutout on the line side can be multiplexed by a logical channel.
If the base SS communication device 1 is provided with a large number of SS transmission / reception channels, and each channel is combined with a logical channel number and used as an extension, a wireless LAN (local area network) can be configured.

In this embodiment, CCITTX. 25, but the ISDN protocol control within the SS interface
(Composite service digital network) or by changing to a LAN protocol, similar control becomes possible.

In this embodiment, the SS section is described as being wireless, but this section may be performed by wire such as a power line or a telephone line.

[0035]

As described above, when there is no data at the packet level, the above spread spectrum communication section is disconnected while the above link is connected, and the packet level is transmitted from the terminal in a state where the spread spectrum communication section is disconnected. When the data is received, the terminal waits by outputting an unreceivable packet to the terminal, the spread spectrum communication section is connected, and the packet level data received from the terminal is transmitted to the packet switching network. Once output, a data packet is output to the terminal to allow data communication from the terminal, so that when there is no data at the packet level, it can be used by other devices in the spread spectrum communication line. Before the received data is output to the packet switching network. For further data that, processing, it is possible to prevent the configuration becomes complicated.

Further, by maintaining a link by outputting a command / response within a set time of a link level operation confirmation timer in a state where a spread spectrum communication section is disconnected, a link level can be reliably maintained. It becomes possible.

When radio is used in the SS section,
There are effects such as effective use of radio waves and labor saving.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a first sequence diagram of the embodiment of the present invention.

FIG. 3 is a second sequence diagram of the embodiment of the present invention.

FIG. 4 is a third sequence diagram of the embodiment of the present invention.

FIG. 5 is a block diagram of a conventional example.

[Description of Signs] 1 SS communication equipment on line connection side 2 SS communication equipment on terminal connection side

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/28 H04L 12/56 H04L 29/00-29/12

Claims (4)

(57) [Claims] A connection control means for controlling connection of spread spectrum communication with a spread spectrum communication device connected to a packet switching network, and a protocol control means for controlling protocol of a digital line with a terminal. When there is no data at the packet level, the protocol control means keeps the link connected, the connection control means cuts off the spread spectrum communication section, and the protocol control means cuts off the spread spectrum communication section. When packet level data is received from the terminal in the state, the terminal is put on standby by outputting a non-receivable packet to the terminal, and the connection control means is connected to the spread spectrum communication section, and is received from the terminal. When the packet level data is output to the packet switching network, Spread spectrum communication apparatus and the terminal interface unit and permits the data communication from the terminal by outputting a receivable packet. 2. The communication system according to claim 1, wherein the protocol control means holds a link by outputting a command / response within a set time of a link level operation confirmation timer in a state where the spread spectrum communication section is disconnected. An interface device between a spread spectrum communication device and a terminal. 3. When a spread spectrum communication section is connected to a spread spectrum communication device connected to a packet switching network, a digital line link is connected to a terminal, and when there is no data at the packet level, While the link is connected, the spread spectrum communication section is cut off, and when packet-level data is received from the terminal in a state where the spread spectrum communication section is cut off, by outputting an unreceivable packet to the terminal, When the terminal is on standby, the spread spectrum communication section is connected, and when the packet level data received from the terminal is output to the packet switching network, the terminal outputs a reception enable packet to the terminal, thereby Interface method between spread spectrum communication device and terminal, characterized by permitting data communication . 4. The method according to claim 3, wherein the command / command is set within a set time of a link level operation confirmation timer in a state where the spread spectrum communication section is disconnected.
An interface method between a spread spectrum communication device and a terminal, wherein a link is maintained by outputting a response.