JPH04356846A - Integrated exchange system - Google Patents

Abstract

PURPOSE:To connect an ISDN packet terminal and a radio packet terminal each other at the exchange system equipped with a line exchange function and an ISDN packet exchange function. CONSTITUTION:At the exchange system equipped with the line exchange function and the ISDN packet exchange function, a radio subscriber circuit 14 to house radio packet terminals 17 and 18, and a radio packet processor 8 are provided. When executing B channel packet communication from the radio packet terminal 17 to an ISDN packet terminal 10, packet data transmitted from the radio packet terminal 17 are transmitted through a route as follows. Namely, the data are transmitted through a radio base station 15 - circuit 14 - time division multiple highway 4 - time division switch 2 - time division multiple highway 4 device 8 - packet highway 3 - packet switch 1 - packet highway 3 - ISDN packet processor 7 - time division multiple highway 4 - time division switch 2 - time division multiple highway 4 ISDN subscriber circuit 9 to the terminal 10.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to wireless packet terminals and I/O
The present invention relates to a switching system that realizes mutual communication with SDN packet terminals.

0002

2. Description of the Related Art Conventionally, the system shown in FIG. 4 has been proposed as a switching system that integrates an ISDN circuit switching function and a packet switching function. In FIG. 4, 31 is a time division switch (TSW) that performs circuit switching.
), 32 is a packet processing device (PHM) that performs packet protocol processing, 33 is a time division multiplex highway (THW) that connects the PHM 32, terminal accommodation device (SLIC) 38, and TSW 31 by time division multiplexing, and 34 is a packet switch ( Packet highway (PHW) connects PSW) 35 and PHM 32 and packet highway controller (PHC) 36, 35 is PHM 32 and SLIC 38
A packet switch (PSW) transfers packet information between
), 36 is a packet highway control device (PHC) that transfers packets to the PSW 35 by monitoring the state of the packet highway based on the packet transfer request from the SLIC 38, and 37 is a terminal (TM) using the I interface.
L), 38 is a terminal accommodating device (SLIC) that accommodates terminals through the I interface, and 39 is a switching control processing device (SLIC).
CM) 40 and other devices.
SCM-BUS), 40 is a switching control processor (SCM) that performs switching control based on call control signals, 41 is SLIC38
and a control bus (
S-BUS).

FIG. 5 is an explanatory diagram of the connection sequence of B channel packets in the switching system. First, the SET UP message from terminal 37-1 is sent to SLIC.
38-1, SLIC38-1 sends SCM40
A call setup request is made via S-BUS 41 and SCM-BUS 39, and when the SCM 40 accepts the request, S
Returns call setup acceptance confirmation to LIC38-1 and sends SLIC3
8-1 receives this and sends CALL P to terminal 37-1.
Return ROC.

[0004] In the SCM 40, after returning the call setup acceptance confirmation,
Caller confirmation and available ingress PH in the system
M32 is selected and a call setup request is made to the incoming PHM32, and if the PHM32 is capable of accepting packet calls, the SC
A call setup confirmation is sent back to M40, and in response to this, SCM40 connects a path between SLIC38-1 and PHM32 on TSW31, sends a call connection instruction to SLIC38-1, and sends CONN from SLIC38-1 to terminal 37- When the terminal 37-1 confirms this and returns CONN ACK, the SLIC 38-1 sends a call connection confirmation to the SCM 40, and preparations for accepting a packet call are completed.

A CR (call request) packet from the terminal 37-1 is processed by the PHM 32 via the TSW 31, and the PHM 32 sends it to the SCM 4 while holding the CR packet.
Notify 0 of the incoming call. Upon receiving this, the SCM 40 performs callee number translation, route selection, and sends a call setup request to the outgoing SLIC 38-2.
ET UP is transmitted to terminal 37-2. Terminal 37-2
accepts this, determines the response channel, and CONN
Send.

[0006] When the SLIC 38-2 receives CONN, it transmits a call setup confirmation to the SCM 40. SCM40
When this is accepted, the output PHM 32 that can handle the response channel is selected (in this example, the same PHM 32 is used for input and output).
M), connect the path between SLIC 38-2 and PHM 32 on TSW 31, send a call connection confirmation to SLIC 38-2, and in response to this, SLIC 38-2 sends CONNACK to terminal 37-2. .

[0007] The SCM 40 then requests the outgoing PHM 32 to set up the call, and the PHM 32 prepares to accept the packet call, returns the call setup confirmation to the SCM 40, and sends the SCM 32 a call setup request.
40 receives this and transmits a confirmation response to the PHM 32 on the incoming side. The ingress PHM 32 receives this and transfers the held CR packet to the egress PHM 32 via the PSW 35.
The outgoing PHM32 sends this CR packet to CN (
Incoming call notification) Edit into packet, TSW31, SLIC3
8-2 to the terminal 37-2.

[0008] Next, the CA (call response) packet returned by the terminal 37-2 is routed through the already set path, that is, S
It is received by the outgoing PHM 32 via the LIC 38-2 and TSW 31, sent to the incoming PHM 32 via the PSW 35, edited into a CC (call acceptance) packet by the incoming PHM 32, and sent to the terminal 37-1 via the TSW 31 and SLIC 38-1. The packet call is returned, the packet call connection is completed, and the packet data can then be transferred.

FIG. 6 is an explanatory diagram of the connection sequence of D channel packets in the switching system. First, the SABME frame is sent from the terminal 37-1 to the SLIC 38-1.
SLIC38-1 sends S-B to SCM40.
A data link setting request is made via US41 and SCM-BUS39, and when the SCM40 accepts it,
Return data link setting confirmation to SLIC38-1, and
Upon receiving this, the LIC 38-1 sends the UA back to the terminal 37-1 to establish a data link, but since the PHM 32 is not yet ready, the RNR frame is sent to the terminal 37-1.
to temporarily stop sending packets.

[0010] After returning the data link setting confirmation, the SCM 40 selects the incoming PHM 32 and
PHM 32 sends a call setup request to SCM 2, and if it is possible to accept the packet call, returns a call setup confirmation to SCM 40, and sends a call setup request to SCM 40.
Upon receiving this, the CM 40 issues a call connection instruction to the SLIC 38-1, transmits an RR frame from the SLIC 38-1, and is ready to accept a packet call.

[0011] A CR (call request) packet from the terminal 37-1 is treated as a mere I (information) frame by the SLIC 38-1 and transferred to the incoming PHM 32 by the PSW 35 via the PHC 36-1, where the packet protocol is Processing is performed, and a call notification is sent to the SCM 40 while retaining the CR packet. In response to this, SCM20 translates the called party number, selects a route, and sends it to SLIC3 on the egress side.
The SLIC 38-2 sends a call setup request to the terminal 8-2, and upon receiving the request, the SLIC 38-2 transmits SET UP to the terminal 37-2. The terminal 37-2 receives this, determines a response channel, and transmits CONN.

[0012] When the SLIC 38-2 receives CONN, it transmits a call setup confirmation to the SCM 40. When the SCM 40 accepts this, the output side P that the response channel can process is
Select HM32 (in this example, the same PHM is used for both input and output), send a call connection confirmation to SLIC38-2,
CONN AC from SLIC38-2 to terminal 37-2
Send K.

Next, the SCM 40 executes the call setup request, call setup confirmation, and acknowledgment procedures with the PHM 32 as in the case of the B channel, and then transfers the CR packet held from the incoming PHM 32 via the PSW 35. Output side PHM3
2, and the egress PHM32 sends this CR packet to CN
It is edited into a packet and sent to the SLIC 38-2 via the PSW 35 and PHC 36-2, and the SLIC 38-2 sends it to the terminal 37-2 as an I frame. Next, terminal 37-2
The returned CA packet reversely follows the same route as the CR and CN packets, is delivered to the terminal 37-1 as a CC packet, and completes the connection of the packet call.

[0014]

[Problems to be Solved by the Invention] However, although the above-mentioned conventional switching system was able to provide circuit switching and packet switching at the same time, it was difficult to connect ISDN packet terminals and wireless packet terminals and to communicate with each other. I couldn't make it happen. Furthermore, since a wireless transmission line, which is a transmission line for wireless packet information, has a much worse bit error rate than a wired transmission line, it is necessary to ensure an error rate comparable to that of a wired transmission line.

[0015] An object of the present invention is to provide an integrated switching system that solves these problems.

[0016]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an integrated switching system in which a function for accommodating wireless terminals is added to a switching system having circuit switching functions and ISDN packet switching functions. an ISDN subscriber circuit that accommodates an ISDN subscriber circuit; a wireless subscriber circuit that accommodates a wireless terminal; a packet processing device that performs packet protocol processing; a time division switch that switches between each of the circuits and devices using a circuit switching method; a packet switch that switches between circuits and devices in a packet-switched manner; a switching control processing device that processes call control information from each of the circuits and devices and determines connection routes for circuit-switched calls and packet-switched calls; An exchange control processor bus that connects the control processor and each of the circuits and devices described above and transmits call control information, a packet highway that connects the packet switch and the subscriber circuit, and a time division switch and the subscriber circuit. A time division multiplex highway is provided to connect the

[0017]

[Operation] Since the present invention has an integrated switching system configured as described above, for example, when performing B channel packet communication from a wireless packet terminal to an ISDN packet terminal,
Packet data transmitted from a wireless packet terminal is transmitted from a wireless subscriber circuit to a time division multiplex highway to a time division switch to a time division multiplex highway to a wireless packet processing device to a packet highway to a packet switch to a packet highway to an ISDN packet processing device. The packet is transmitted to the ISDN packet terminal via the division multiplex highway-time division multiplex highway-time division multiplex highway-ISDN subscriber circuit. At this time, call control information between the subscriber circuit and the exchange control processor is transmitted via the exchange control processor bus.

[0018]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an integrated switching system according to an embodiment of the present invention, in which 1 is a packet configured with hardware that switches packet information of a packet call based on switching information given to each packet. Switch (PSW), 2 is 64k
A time division switch (TS) that realizes line switching in b/s units.
W), 3 is a packet highway (PHW) that connects PSW1 and various subscriber circuits and trunk circuits, 4 is TSW
2 and a time division multiplex highway (THW) that connects various subscriber circuits and trunk circuits, 5 a switching control processor (SCP) that controls switching of circuit switched calls and packet calls, and 6 a switching control processor (SCP) that connects the SCP 5 and other various devices. Connected switching control processor bus (SCP-BUS) for information transmission, 7 is IS
I that performs packet protocol processing for DN packet calls
8 is a wireless packet processing device (RADIO-PH) that executes packet protocol processing for wireless packet calls; 9 is an ISDN subscriber circuit (ISDN-SLIC) that accommodates ISDN terminals through an ISDN interface; ), 10-11 are ISD
ISDN packet terminal (I
12 is an ISDN network interface trunk (ISDN-TRK) for connecting this switching system to the ISDN network, and 13 is an ISDN network (ISDN-TRK) for providing ISDN network services.
14 is a wireless subscriber circuit (RADI) that accommodates wireless terminals 17-18 via wireless base stations 15-16
O-SLIC), 15-16 are wireless base stations (BS) that provide wireless transmission paths between wireless terminals 17-18 and this switching system, and 17-18 are wireless packet terminals that use wireless packet switching services. (RPTE), 19 to 21 are error correction circuits for improving the bit error rate of the wireless transmission path to the bit error rate required by the packet protocol of layer 2 or higher.

[0019]The error correction circuit is RADIO-PH8.
Alternatively, it may be provided in the wireless base stations 15 and 16. Also, Figure 1
shows only the equipment that performs packet switching. Next, the operation of the integrated switching system according to the embodiment of the present invention will be explained. FIG. 2 shows the I/O from the wireless packet terminal in the embodiment of the present invention.
FIG. 3 is an explanatory diagram of a connection sequence when making a B channel packet connection to an SDN packet terminal.

[0020] First, the RPTE 17 establishes a wireless channel with an appropriate BS 15, and then sends out a call setup request message. RADIO-SLIC1 via BS15
4 receives this, RADIO-SLIC 14 sends S
Makes a call setup request to CP5 via SCP-BUS6,
When SCP5 receives this, RADIO-SLIC
14, and sends a call setup acceptance confirmation to RADIO-S.
In response to this, LIC14 uses RPTE1 via BS15.
A call setup acceptance confirmation is returned to 7.

[0021] In SCP5, after returning the call setup acceptance confirmation,
An available incoming RADIO-PH8 in the system is selected, a call setup request is made to the incoming RADIO-PH8, and if the RADIO-PH8 can accept a packet call, it returns a call setup confirmation to the SCP5, and the SCP5 Then, in response to this, RADIO-SLIC14 and RAD on TSW2
A time division path is connected between the IO-PH8, a call connection instruction is sent to the RADIO-SLIC14, and the RADIO-S
When the LIC14 sends a call connection instruction to the RPTE17 via the BS15, and the RPTE17 confirms this and returns a call connection confirmation via the BS15, the RADIO-SLIC
14 sends a call connection confirmation to the SCP 5, and preparations for accepting a packet call are completed.

[0022] Inside RPTE17 and RADIO-SLIC1
Radio transmission path bit error correction circuits 19 and 20 located within 4 perform error correction using correction codes. Also, RADIO
- In the SLIC 14, the transmission rate of the wireless traffic channel is matched with 64 kbit/s, which is the exchange unit of the TSW2. RPTE17 to BS15 and RA
CR packet transmitted via DIO-SLIC14 (
The call request) is processed by the RADIO-PH8 via the TSW2, and the RADIO-PH8 notifies the SCP5 of the incoming call while holding the CR packet. In response to this, SCP5 translates the called party number, selects the route, and sends the outgoing I
A call setup request is made to the SDN-SLIC9, and the ISDN-S
In response to this, LIC9 performs SET UP to IPTE1.
Send to 0. The IPTE 10 accepts this, determines a response channel, and transmits CONN.

When the ISDN-SLIC 9 receives CONN, it transmits a call setup confirmation to the SCP 5. SCP5
When this is accepted, the response channel selects the outgoing ISDN-PH7 that can be processed, and the ISDN-S is placed on TSW2.
Connect the time division path between LIC9 and ISDN-PH7, send a call connection confirmation to ISDN-SLIC9, and
In response to this, DN-SLIC9 added CO to IPTE10.
Send NN ACK.

[0024] In SCP5, next is the outgoing ISDN-PH7.
ISDN-PH7 makes preparations to accept the packet call, returns call setup confirmation to SCP5, and sends a call setup request to SCP5.
Upon receiving this, the CP5 transmits an acknowledgment to the ingress side RADIO-PH8. On the input side RADIO-PH8,
In response to this, the held CR packet is sent to the egress ISDN-PH7 via PSW1, and the egress ISDN-PH
7 edits this CR packet into a CN (incoming call notification) packet and sends it via TSW2 and ISDN-SLIC9.
Send to PTE10. Next, IPTE10 returned C.
The A (call response) packet is accepted by the outgoing ISDN-PH7 via the already set path, sent to the incoming RADIO-PH8 via PSW1, and edited into a CC (call acceptance) packet by the RADIO-PH8. TSW2, RAD
RPTE17 via IO-SLIC14, BS15
, the packet call connection is completed, and the packet data can then be transferred.

FIG. 3 is an explanatory diagram of a connection sequence when a D channel packet connection is made from a wireless packet terminal to an ISDN packet terminal in an embodiment of the present invention. First, the RPTE 17 establishes a wireless channel with an appropriate BS 15, and then sends out a SABME frame. B.S.
When RADIO-SLIC 14 receives this via SCP 15, RADIO-SLIC 14 sends SCP-B to SCP 5.
A data link setup request is made via US6, and SCP5
When this is received, a data link setting acceptance confirmation is sent back to the RADIO-SLIC14, and the RADIO-SLIC
In response to this, SLIC14 uses RPTE via BS15.
17 and establish a data link, but R
Since ADIO-PH 8 is not yet ready, it sends an RNR frame to RPTE 10 and temporarily stops packet transmission.

[0026] In the SCP5, after returning the data link setting confirmation, the input side RADIO-PH8 that can be used in the system
and sends a call setup request to the incoming RADIO-PH8, and if the RADIO-PH8 can accept the packet call, it sends a call setup confirmation back to the SCP5, and upon receiving this, the SCP5 connects the call to the RADIO-SLIC14. Give instructions and RP from RADIO-SLIC14 via BS15
An RR frame is sent to the TE 17, and preparations for accepting a packet call are completed.

[0027] From RPTE17 to BS15 and RADIO
- The CR packet (call request) transmitted via the SLIC 14 is subjected to protocol processing by the RADIO-PH 8 via the PSW 1, and the RADIO-PH 8 notifies the SCP 5 of the incoming call while retaining the CR packet. Upon receiving this, SCP5 translates the called party number, selects a route, and selects the outgoing ISDN.
- Make a call setup request to SLIC9, and
9 receives this and sends SET UP to the IPTE 10. The IPTE 10 accepts this, determines a response channel, and transmits CONN.

When the ISDN-SLIC 9 receives CONN, it transmits a call setup confirmation to the SCP 5. SCP5
When this is received, the outgoing ISDN-PH 7 that can handle the response channel is selected, and a call connection confirmation is sent to the ISDN-SLIC 7. Upon receiving this, the ISDN-SLIC 7 sends a CONN ACK to the IPTE 10. S
CP5 then requests call setup to ISDN-PH7 on the outgoing side, ISDN-PH7 prepares to accept the packet call, and returns a call setup confirmation to SCP5. send an acknowledgment to. The ingress side RADIO-PH8 receives and holds the CR packet and sends it to the egress side ISD via the PSW1.
This CR is sent to N-PH7, and this CR is sent to the outgoing ISDN-PH7.
Edit the packet into a CN (call notification) packet and send it to PS
It is sent to IPTE 10 via W1. Next, IPTE1
The CA (incoming call response) packet returned by 0 is received by the outgoing ISDN-PH7 via the already set path, and the PSW
1 to the incoming side RADIO-PH8, and RADI
Edit into CC (call acceptance) packet with O-PH8 and send to PS
It is returned to the RPTE 17 via W1, RADIO-SLIC 14, and BS 15 to complete the packet call connection, after which it becomes possible to transfer the packet data.

It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0030]

[Effects of the Invention] As explained in detail above, according to the present invention, the following effects can be achieved. (1) Since the interconnection between ISDN packet terminals and wireless packet terminals and the connection between wireless packet terminals can be achieved using the same switching system, there is no need to prepare a separate packet switching system for wireless packet terminals, resulting in economical integration. A communication network can be configured. (2) ISDN circuit switching, wireless circuit switching, ISDN packet switching, and wireless packet switching can be realized in the same switching system. Since called number translation and route selection in wireless exchanges are performed all at once by an exchange control processing device similar to ISDN circuit switching and ISDN packet switching, there is no need for information exchange between exchange systems for wasteful call setup. This eliminates the need for wasteful processing associated with system partitioning. (3) High-quality communication can be performed even when using a wireless terminal.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an integrated switching system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a connection sequence when a B channel packet connection is made from a wireless packet terminal to an ISDN packet terminal in an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a connection sequence when a D channel packet connection is made from a wireless packet terminal to an ISDN packet terminal in an embodiment of the present invention.

FIG. 4 is a block diagram showing the configuration of a conventional switching system.

FIG. 5 is an explanatory diagram of a connection sequence of B channel packets in a conventional switching system.

FIG. 6 is an explanatory diagram of a connection sequence of D channel packets in a conventional switching system.

[Explanation of symbols]

1 Packet switch 2
Time division switch 3 Packet highway 4 Time division multiplex highway 5 Exchange control processing device 6
Exchange control processor bus 7
ISDN packet processing device 8
Wireless packet processing device 9 IS
DN subscriber circuits 10, 11 ISDN packet terminal 12 ISDN network interface trunk 13 ISDN network 14
Wireless subscriber circuits 15, 16 Wireless base stations 17, 18 Wireless packet terminals

Claims (2)

[Claims] Claim 1. An integrated switching system in which a function for accommodating wireless terminals is added to a switching system having a circuit switching function and an ISDN packet switching function, comprising: (a) an ISDN subscriber circuit accommodating an ISDN terminal; and (b) a wireless (c) a packet processing device that performs packet protocol processing; (d) a time division switch that performs circuit switching between each of the circuits and devices; (e) each of the above. a packet switch that switches between circuits and devices using a packet switching method; and (f) a switching control processing device that processes call control information from each of the circuits and devices and determines connection routes for circuit-switched calls and packet-switched calls. (g) a switching control processing device bus that connects the switching control processing device and each of the circuits and devices and transmitting the call control information; and (h) a connection between the packet switch and the subscriber circuit. packet highway and (j
) A time division multiplexing highway that connects the time division switch and the subscriber circuit, and provides circuit switching services as well as communication between wireless packet terminals, between ISDN packet terminals and wireless packet terminals, and between ISDN packet terminals. An integrated exchange system characterized by enabling communication. 2. The integrated switching system according to claim 1, further comprising a wireless transmission path bit error correction circuit provided within the wireless terminal and the integrated switching system.