WO2001041461A2 - Method for improving flow control in the message transfer part in asymmetric load generation - Google Patents

Method for improving flow control in the message transfer part in asymmetric load generation

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Publication number
WO2001041461A2
WO2001041461A2 PCT/EP2000/011886 EP0011886W WO0141461A2 WO 2001041461 A2 WO2001041461 A2 WO 2001041461A2 EP 0011886 W EP0011886 W EP 0011886W WO 0141461 A2 WO0141461 A2 WO 0141461A2
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WO
Grant status
Application
Patent type
Prior art keywords
data
transmission
control
address
signaling
Prior art date
Application number
PCT/EP2000/011886
Other languages
German (de)
French (fr)
Other versions
WO2001041461A3 (en )
Inventor
Klaus David Gradischnig
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements
    • H04Q3/64Distributing or queueing
    • H04Q3/66Traffic distributors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements
    • H04Q3/0016Arrangements providing connection between exchanges
    • H04Q3/0025Provisions for signalling

Abstract

The invention relates to a transmitting and receiving device (1) and to a method used in said transmitting and receiving device for transmitting and receiving data in a signaling system. The inventive device comprises a transmitter (2) for transmitting and a receiver for receiving user and control data. Received data which indicates an overloading of the transmission path is transmitted to the destination of the data using the overloaded transmission path.

Description

description

Process for improving the flow control in the message transfer part in case of asymmetrical load generation

The present invention relates to a transmitting and receiving apparatus for transmitting and receiving data in a signaling system, as described in the preamble of the appended claim 1 and an applied in this transmission and receiving apparatus processes as described in the preamble of the appended claim 5 ,

Under signaling, meaning the exchange of signaling messages for. B. between databases, switching nodes and devices. A protocol for

Signaling is the signaling system no. 7 available.

Signaling messages z. As for building, maintaining and triggering a telephone connection, the transfer of call number, caller - and cost information, the

Transferring routing information for 0130-, 0180-, and 0190-Rufnummmern, advanced features such as

Call forwarding and conference call and the exchange of information between network operators such. As needed on the whereabouts of a mobile subscriber.

The signaling network is often superimposed on the payload data, that is, the transmission paths of the Nutzkanales be shared for the physical transfer of signaling messages at higher layers, however, the networks are completely separated.

The signaling network consists of the signaling points (SP), wherein between the Signalisierendpunkten (Signaling End Points) and the Signalisiertransferpunkten (Signaling Transfer Points) is discriminated, and the transmission paths between the signaling points. The Signalisierendpunkten offered between Service Switching Points (SSP) and between service control point (SCP) is distinguished. A service switching point for transmitting. B. signaling messages to another service switching point, needed to build, hold or disconnecting a telephone connection. A service switching point can also send a request to a database in a service control point to z. As to determine the routing information from a 0130 number.

The connection between individual signaling points via Ubertragungsabschnitte, so-called. Links. As a rule, the individual signaling points over several transmission sections are connected together, the

Transmitting portions are formed bi-directionally, as a rule, that is, that the data flow occurs in both directions.

The signaling system no. 7 essentially consists of the message transport part, the so-called transfer. Message Part (MTP) and the user parts, the so-called. User Parts (UP).

The ISDN User Part (ISUP) provides, for example, the functions that are required for the control of voice calls between a calling and a called subscriber. This includes the control of features such. B.

Call forwarding and the connecting or call control.

Further, application-oriented functions are among other methods by. Asked Signaling Connection Control Part (SCCP) are available. SCCP messages serve, for example, to transmit messages that must be exchanged between mobile operators. These messages contain information about the location of the subscriber and essentially serve the constant updating of mobile operators of the databases.

Normally, by the SCCP users these messages as Q. 771 generated to Q.775 (Transaction Capabilities).

The Message Transfer Part forms a transport system for the

the user part data and consists of three layers or

Level s: MTP Level 1 is for physical bit transmission of

Data, the MTP Level 2 is used to secure the piecewise

Transmission and the overload protection and the MTP level 3 is used for the routing (routing) of the signaling messages and to the establishment and the maintenance of the

Connection.

In Level 3 of the Message Transfer Part, it may happen that transmission paths fall into overload, that is, that arrive more messages can be processed as in the transmission of data. The incoming data is up to the other transmitting or processing in a Sendebzw. Reception memory cached.

Overloading of transmission lines has the consequence that the traffic that is handled by these pathways, must be reduced in order to avoid data loss.

In the current state of the art of each transfer node (STP), the outgoing path

(Transmitting portion) (TFC Transfer Control messages called.) Is overloaded to a specific destination, control data sent to the origin whose data (signaling messages) are sent over the congested road.

After the specification Q.704 a TFC message is sent to the origin of the message after a certain amount of data (after every eighth message) that use this congested way. Then reduced the origin based on the rate of incoming TFC control data of the outgoing traffic. Here are unaffected, so as not to interrupt these compounds or to waste not already made data transfers existing connections wherever possible. Preferably, the outbound traffic is reduced to the effect that less or no compounds from the origin in the outgoing direction are constructed as far as possible.

Even with SCCP messages that are not necessarily related to a traffic channel or a Nutzkanalverbindungsaufbau, you want to apply a similar principle. Here, a transaction builder Q.771 to Q.775 according to (Transaction Capabilities) is considered to be equivalent to a connection setup. At overload is therefore wants to reduce the creation of new transactions, messages relating to existing transactions, however, transfer loss as possible. In further embodiments, therefore, the term "connection", the term "transaction" included.

but it may be now that is overloaded in one direction of transmission, but from that direction a few new connections and transactions not be established or, therefore can not be reduced, the number of new connection or transaction structures.

. With reference to FIG 1, this state is explained in more detail:

For example, intelligent networks the case, as shown in Fig. 1, in the so-called. Arise that a request (for example, from SSP1 to SCP1) in a direction little

generating message traffic (ie from SCPL according SSP1) in response has in the opposite direction considerably more communications result.

If the transmission path from STP2 overloaded by postmark, then come the control mechanisms already described are used, ie are periodically TFC messages to the origin of the congested road-use messages sent in the example, by SCPL.

But since the end node SCPL not own any compounds or

initiated transactions, it can not reduce the initiation of new connections. It could only be reduced traffic may be in the answers to requests that come from SSP1 discarded; it will still be sent requests from SSP1.

This problem can also occur in voice traffic when the transmission in one direction is already overloaded and are initiated from the opposite direction, new connections.

In a study of EURESCOM entitled "Critical Scenarios for Actual Congestion Control Mechanisms * is proposed to correct the problem that generated by the transfer node TFC messages are not only the origin of the user data using the congested road, broadcast, but also to their destination.

In the example has been shown with reference to FIG. 1, which would mean that the MTP Level 3 in STP2, the way to stpl is overloaded, a TFC message is sent to SCPL (prior art). In addition, the STP2 sends, as proposed in the study, a message to the destination of the congested road-use user data, so to SSP1.

The disadvantage of this solution is j edoch that a complex traffic measurement is necessary in STP, d. H . that the uneven utilization of the transmission paths must be detected and measured.

The object of the present invention is thus, end an S and to provide receiving means for transmitting and receiving data in a signaling system according to the preamble of the appended claim 1 and an applied in this transmission and receiving apparatus method according to the appended claim 3, wherein the control data is sent to the destination of transmitted over a congested transmission section data.

This object is achieved by a transmitting and receiving apparatus for transmitting and receiving data in a signaling system according to appended claim 1 and an applied in this transmission and receiving apparatus method according to the appended claim. 3

According to the present invention will be in the affected end node (SCP, SSP) does not respond to a TFC message by a reduction or not only by reducing the transmitted data. Rather, a TFC message is sent to the destination of the congested transmission-use data from these end nodes; in contrast to the measures proposed in the aforementioned study solution where by the relevant transfer node (STP) is sent a message to TFC origin and destination.

This has the advantage that the traffic situations (ie a possible unequal utilization of transmission paths) does not have to be determined in the affected transfer nodes. Rather, the invention assumes that these traffic situations are best known in the affected end node (such as SCP and SSP) and the invention therefore takes this, most suitable, end nodes is used. The necessary by the invention changes in the signaling network is thus limited to the affected end node; The invention must not be introduced into the transfer node.

Advantageous embodiments of the invention are given in the dependent claims 2 and 4, and 5. FIG.

The control data (TFC) messages, which according to the specification Q.704 ITU-T standards overloading the

See transmission path containing among other things a source and a destination address of the TFC message and the address of the target (affected address) to which the path is congested. The destination address is in this case represents the end node (SSP, SCP) sends the user data using the congested transmission. The origin address of the TFC-message contains the node which generates the TFC message. The "data address" includes the node for which said user data were determined.

According to the invention the TFC message in the node corresponding to the destination address (the address of the own node) are replaced with the originally affected address upon receipt and the original destination address used as the concerned address and sender address, thus the received TFC message to the destination of the congested transmission-use to send user data.

This goal is now in turn reacts to receipt of this message preferably TFC in that the initiation of new connections or transactions to the corresponding node representing the origin of the TFC message is reduced.

The present invention is preferably in end nodes, such as Service Switching Points (SSP) and Service Control Points (SCP) in the signaling system no. 7 applied. Fig. 2 shows the schematic structure of the system according to the invention for transmitting and receiving data in a signaling system.

As shown in Fig. 2, the transmitting and receiving device 1 for transmitting and receiving data in a signaling network of a transmitter 2 according to the invention is for transmitting and a receiver 3 for receiving of user and control data. Furthermore, the transmitting and receiving device 1 according to the invention comprises a device 5 for processing control data. The data is transmitted via a bidirectional transmission section. 4

, Control data, the overloading of the

See transmission path to a particular destination (so-called. TFC messages in the signaling system no. 7) is received, the transmitting and receiving device 1 responds according to the invention in the way that these control data in the case of a situation in which the inventive transmission and

be receiving orrichtung (substantially) fewer connections and transactions constructed as assumed sends to the receiver of the congested transmission-use user data.

The control data includes the source address of the node (STP), which sends the control message, the destination address of the node 1 (ie, the transmission according to the invention and receiving apparatus) that receives the control message and the address of the destination to which the transfer portion 4 is overloaded.

Here, by the device 5, the destination address (the address of the own node 1) by the originally affected address (ie, the address of the destination to which the transmission section is overloaded 4) is replaced and the original destination address (address of the node 1) as affected address and sender address used so as to send the received control message to the destination of the congested transmission-use user data by means of the transmitter. 2

The objective of this user data, ie the corresponding end nodes, in turn, is responsive to receipt of the TFC message to specification, eg. B. according to Q.724 or Q.764, preferably by less new connections to the end node (transmitting and receiving apparatus 1 of the invention) be established, the TFC sent the message.

With the present invention, a known mechanism for controlling the flow control is integrated in an overload of the transmission path in a compatible manner into an existing system.

The effectiveness of the methods described could be further improved if the time taken for the TFC messages for transmission over the congested transmission path is reduced. This happens for example the fact that eligible for the transmission paths prioritized output queues are used so that these control data can be sent preferred over other data via the signaling network. The system with such prioritized

but would output queues to be more or less introduced throughout the signaling network.

Claims

claims
1. transmitting and receiving apparatus (1) for transmitting and receiving data in a signaling system comprising a transmitter (2) for transmitting and a receiver (3) for receiving of user and control data via a transmission section (4) can be transmitted bidirectionally wherein the transmitting and receiving device (1) upon receipt of control data, the overloading of the transmission section display (4) by transmitted data, reduces the development of new compounds for transmitting data through the congested transmission section (4), ge ennzeichnet by a means (5) for processing the control data including a source address of the sender, a destination address of the transmitting and receiving device (1) and an address of the destination to which the transmission section (4) is congested, wherein the device (5) this control data processed by the destination address by the address of the destination to which the transmission section (4) is overloaded, erse TZT shipped and the original destination address as a new address of the destination to which the transmission section (4) is overloaded and used as the new source address and the processed control data via the transmission section (4).
2. transmitting and receiving apparatus (1) according to claim 1, characterized in that the received control data indicative of an overload of the transmission section (4) by transmitted data corresponding to the specifications according to ITU-T Q.704 standard.
3. A method for transmitting and receiving data in a signaling system comprising the steps of
Transmitting and receiving user data and control data, said display upon reception of control data, the congestion of a transmission section (4) by transmitted data, the development of new compounds for transmitting data through the congested transmission section (4) is reduced, characterized by the following additional
Steps replace the destination address of the control data through the address of the destination to which the transmission section (4) is overloaded, replacing the address of the destination to which the transmission section (4) is overloaded by the original destination address, the source address replaced by the original destination address and
Sending the control data.
4. System in accordance with claim 3 characterized in that the received control data indicative of an overload of the transmission section (4) by transmitted data corresponding to the specifications according to ITU-T Q.704 standard.
5. The use of a transmitting and receiving apparatus according to claim 1 or 2 or a method according to claim 3 or 4 in the signaling system no. 7,.
PCT/EP2000/011886 1999-11-29 2000-11-28 Method for improving flow control in the message transfer part in asymmetric load generation WO2001041461A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19957293.3 1999-11-29
DE19957293 1999-11-29

Publications (2)

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WO2001041461A2 true true WO2001041461A2 (en) 2001-06-07
WO2001041461A3 true WO2001041461A3 (en) 2001-12-27

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Application Number Title Priority Date Filing Date
PCT/EP2000/011886 WO2001041461A3 (en) 1999-11-29 2000-11-28 Method for improving flow control in the message transfer part in asymmetric load generation

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5930348A (en) * 1997-03-20 1999-07-27 Northern Telecom Limited Dynamically controlled routing of calls in intelligent networks
US5953403A (en) * 1997-01-31 1999-09-14 Stentor Resource Centre, Inc. Method for preventing call congestion on outgoing trunks of a local telephone exchange

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5953403A (en) * 1997-01-31 1999-09-14 Stentor Resource Centre, Inc. Method for preventing call congestion on outgoing trunks of a local telephone exchange
US5930348A (en) * 1997-03-20 1999-07-27 Northern Telecom Limited Dynamically controlled routing of calls in intelligent networks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BIJAN JABBARI: "ROUTING AND CONGESTION CONTROL IN COMMON CHANNEL SIGNALING SYSTEM NO. 7" PROCEEDINGS OF THE IEEE,US,IEEE. NEW YORK, Bd. 80, Nr. 4, 1. April 1992 (1992-04-01), Seiten 607-617, XP000304351 ISSN: 0018-9219 *

Also Published As

Publication number Publication date Type
WO2001041461A3 (en) 2001-12-27 application

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