WO1999034637A1

WO1999034637A1 - Method for a narrowband switching node to transmit useful and signaling information via a broadband network

Info

Publication number: WO1999034637A1
Application number: PCT/DE1998/003546
Authority: WO
Inventors: Klaus Wille; Helmut Kienberger; Michael Tietsch; Werner STÖCKL
Original assignee: Siemens Aktiengesellschaft
Priority date: 1997-12-23
Filing date: 1998-12-02
Publication date: 1999-07-08
Also published as: EP1042939A1; CN1283377A; CN1132494C; DE19757610A1

Abstract

A transition unit (IWU) integrated in a narrowband switching node (SVK1) is provided to split a trunk group of narrowband useful channels (SN) for the transmission of useful information to other target narrowband communication devices (SVK2, SVK3) connected to the broadband network (ATM) into target-specific partial trunk groups. By directly accessing the signaling information in the node, the integrated transition unit (IWU) can easily allocate its target-specific segments to the partial trunk groups and convert them into narrowband signaling channels which are respectively included in the partial trunk groups.

Description

description

Method for a narrowband switching node for transmitting useful and signaling information over a broadband network

The invention relates to a narrowband switching node for establishing and clearing narrowband connections, which can be connected to a broadband network via a transition unit, and a method for transmitting useful and signaling information from the narrowband switching node via the broadband network to other target narrowband communication devices connected to it. The target narrow band communication devices are e.g. Narrowband switching nodes, narrowband terminals or narrowband terminals emulating broadband terminals in question.

According to the known prior art, narrowband communication devices can be networked, i.e. can be made interconnectable by connecting them to a broadband network via so-called interworking units (IWU). Broadband networks generally have high transmission capacities and provide connected narrowband communication devices with a large number of simultaneously usable channels for data transmission.

Previously known transition units are each connected via a narrowband interface to the associated narrowband communication device and a broadband interface to the broadband network. In addition to adapting different transmission protocols, a transition unit has the task of dividing a bundle of narrowband channels coming from the connected narrowband communication device, for example a PCM30 link with 30 B channels and a D channel, into several sub-bundles, the other target narrowband communication connected to the broadband network facilities are assigned. The sub-bundles are used to transmit useful and signaling information to the target narrowband communication devices assigned to them and are each transmitted in virtual channels via the broadband network. This technique is often also referred to as fractional backboning and is described, for example, in the document "Circuit Emulation Service Interoperability Specification, af-vtoa-0078.000" of the ATM Forum Standards, January 1997, pages 8 to 16.

When splitting the original bundle of narrowband channels, there is the problem of assigning a transmission target-specific narrowband signaling channel from the narrowband signaling channel of the original bundle to each sub-bundle, e.g. the D channel of a PCM30 route. For this purpose, the transition unit must filter out the signaling information specific to the respective transmission destination from the original narrowband signaling channel and convert it into separate narrowband signaling channels assigned to the respective sub-bundles. However, this process is generally very complex since the original narrowband signaling channel must be analyzed at least up to the third protocol layer (the network layer) of the OSI reference model.

The analysis of a narrowband signaling channel is particularly difficult if additional signaling information is transmitted therein, for example for performance control or routing. In these cases, an analysis generally requires the knowledge of further, purpose-specific protocol layers, which can also belong to a large number of different special protocols, each of which must be treated individually. As a rule, not all special protocols used in narrowband networks are available to a transition unit. The object of the present invention is to provide an arrangement for connecting a narrowband switching node to a broadband network and a method for transmitting useful and signaling information from the narrowband switching node to other target narrowband communication devices connected to the broadband network, each of which requires less processing of the signaling information .

According to the invention, this object is achieved by an arrangement with the features of claim 1 and a method with the features of claim 2.

Advantageous developments of the invention are specified in the subclaims.

A transition unit is integrated in the narrowband switching node in such a way that it also allows it to access signaling information present in accordance with a protocol used internally in the node, which previously unknown, non-integrated transition units are inaccessible in this form. In particular, the integrated transition unit can access portions of the signaling information specific to the transmission destination before it is converted into a narrowband signaling channel in accordance with an often complex signaling protocol.

A portion of the internal signaling information describes the assignment of narrowband user channels to the different target sites connected to the broadband network.

Narrowband communication facilities. This information component can be evaluated by the transition unit bypassing a complicated signaling protocol. It is used to split the bundle of narrowband user channels into the target

Sub-bundles assigned to narrowband communication devices to be determined. A sub-bundle can also consist of only a single narrowband useful channel or can be completely empty.

A portion of the intra-node signaling information relating to the transmission of useful information to a transmission destination is generally uniquely assigned to the transmission destination by means of intra-node assignment information. On the basis of this node-internal assignment information, the transition unit can easily identify the respectively assigned portion of the signaling information for each transmission destination. The identified portions are extracted by the transition unit and implemented in each case in m separate narrowband signaling channels, which are added to the associated sub-bundles. The sub-bundles are then converted into virtual broadband channels by the transition unit and transmitted to the target narrowband communication devices assigned to them via the broadband network.

Likewise, portions of the signaling information provided for the control of performance features or for routing can be processed in a simple manner specific to the transmission destination on the basis of available node-internal allocation information.

According to an advantageous embodiment of the invention, logical or physical ports are assigned to the target narrowband communication devices and thus to the sub-bundles in the transition unit. Correspondingly, useful information and signaling information to be transmitted from the transition unit to the target narrowband communication devices is transmitted port-related, ie with assignment information identifying the respective port. Since port-related transmission of useful and signaling information is already provided in many previously known narrowband switching nodes in order to control peripheral narrowband network modules, this embodiment of the invention can be moderate interventions in existing structures of known narrowband switching nodes can be realized.

The virtual broadband channels for transmitting the useful and signaling information of the individual sub-bundles via the broadband network can be provided in several ways:

For individual sub-bundles, at least one permanent virtual channel with a defined bandwidth, e.g. through broadband network management. An advantage of permanently set up virtual channels is that their full transmission capacity is immediately available at all times.

According to a first variant, the bandwidth of a permanently established virtual channel, if the broadband network provides this possibility, can also be dynamically adapted to a data volume to be transmitted in individual sub-bundles if the transition unit requests this.

A second variant provides that only when useful or signaling information is available in individual sub-bundles does at least one virtual channel to the respective target narrowband communication device from the transition unit, e.g. through broadband signaling according to protocol Q.2931. To do this, the broadband addresses, e.g. the E.164 addresses, the target narrowband communication devices are known and assigned to the respective sub-bundles and / or the respective logical or physical ports.

Virtual channels that are provided in accordance with the two variants each occupy only the bandwidth in the broadband network that is actually required to transmit the currently available useful information or signaling information, which can lead to considerable cost savings, particularly when using public broadband networks. Due to the previously co o>>P> P ¹ n cn o Cn o Cπ

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Identification information, e.g. by numbering the sub-bundles, which are transmitted to the transition unit of the respective target narrowband communication device when a connection is established via a virtual channel of the broadband network. As a result, this transition unit can uniquely assign an incoming broadband connection to the associated sub-bundle and thus in particular assign a narrowband signaling channel to the narrowband user channels transmitted in the same sub-bundle, but possibly via other virtual channels.

The invention is explained in more detail below using an exemplary embodiment with reference to the drawing.

The figure shows a communication network consisting of three narrowband switching nodes networked via an ATM network in a schematic representation.

In the figure, three narrowband switching nodes SVK1, SVK2 and SVK3 are shown schematically, each of which is connected to an ATM network ATM via a broadband transmission link BS. Each narrowband switching node is connected to the other narrowband switching node via a virtual channel VC of the ATM network ATM.

Instead of the narrowband switching nodes SVK2 and SVK3, other narrowband communication devices of the type described above could also be provided, in large numbers. The choice made only serves to simplify the following description.

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3 P DJ 1 N 3 rt d DJ Φ P- P- DJ 3 o & 3 φ DJ. Φ P- ω N a a> -3

3 3> S5 φ G a rt 3 b- P N 3 sQ Ω P- P rt d P- G er CO 7t 3 φ Ω 7t φ

-_l. DJ DJ Pl Φ P- 3 b- P a P- 3 d co P- 3 tr rt a Φ 3 3 er Φ Φ Z PJ tr DJ 3 φ rt ^ K rt Ω ∑: Φ d K co P- ιq rt PJ Φ rt 3 P- P- φ Φ rt 3> d: Φ 3 o

∑: P- 1 N tr P- rt 3 1 cn P- 3 φ N b- d P ^J 7t 3 P CO P er 3 l er 3 D>: Φ Φ

Φ O <tsi 3 PN ι ≥5 Φ φ 3 b- da P- gd 3 Φ DJ 3 S Φ Φ S Φ P ^J 3 P-

P- 3 n φ N Φ a 3 cn Φ rt P rt Φ v φ cn Φ 3 ιq rt DJ P- Hl co a 1 P TJ Φ DJ: 3

P ¹ b- d rt DJ 7t rt N d P- φ 3 P- P- ιq CΛ a p- rt N Hi rt PJ G o 3 <Z ~ N

P- CL ∑: b- ^> tr 3 ti N rt 3 Pi rt O φ CΛ co 3 φ o rt rt d Φ Φ er 3 a P Φ

^ φ P- φ P d J: DJ o Φ -q: Φ P l P Φ N o P 3 d P ^J i. 3 tr Φ CΛ P- rt CΛ CL b- ^>

Φ ω P 3 er 3 d -q rr CO a cn P rt a Φ d P- a cn Φ d Φ a ω P- Φ Φ CΛ Z P- 3

3 CL Φ CL Hl φ φ P- 7t • 3 P- 3 P- φ d CΛ er 3 o Φ ti rt φ Φ _l- Φ P P- 3 3 φ DJ L_l. Φ P ¹ -q 3 P ^J b- P- Φ P ^J υ3 P 3 PJ N P- i → P- co 3 tsi Φ DJ P- rt tr v φ Pl CΛ 3 Φ rt er cn cn <Q a Φ CO a O dd tr TJ 3 φ

P- ∑: 3 3 P DJ 3 Λ S Φ DJ a Φ Λ 'Φ TJ TJ ti P- 3 N 3 P "CL Ω 3 3 PG φ Φ cn N D> rt DJ rt • <] CO P ¹ Φ 3 3 PJ P- Φ N DJ 3 P- Φ o φ tr -q Φ L_l. TJ er

P ^J P- Ω d ι d? NP 3 a tn 3 N £ 1— 'vq tK φ rt vq P CΛ 3 φ o Φ

1 b- tr Pi φ d Ω> 3 P- Φ P ¹ Φ PJ: N P- P- d O P- • P- 3 3 ∑: P 3 P

CΛ P- b- d: 3 3 N - 3 P o P ^J 1— 'Φ Hi er CΛ 3 3 φ cn -qdo L_l. H rt St. 3

Ω v P- ιQ CL rt d er <O sQ 3 φ b- P- Φ P- -q 3 3 o Ω DJ P a Φ P- N o P- ty φ φ Φ φ Φ DJ - N a 3 DJ: uq P- ti cn P φ φ d P- tr 3 d ∑: b- d P rt

3 3 ~ 3 3 P b- φ z Φ P- 3 P- co a d φ Ω Φ P 3 3 7t φ φ N PJ Φ ω o 3 rt

DJ φ • co O. P 3 N ω Ω Φ 3 tr P- d P- DJ 3 d P- P PJ P ^J b ~ l 3 σ DJ P a rt Ω tr P ^ q <φ rt 3 DJ? 3 [Sl I— ¹ co> P ^J N a rt d er Φ CL G DJ 3 co a co a Φ Φ tr Φ φ Φ PO -q 3 DJ 3 d J Φ G CΛ d 3 P 3

DJ P- er rt CL Φ 3 <Φ co φ 3 co co P "- 'co -q rt o O Φ Φ ιq d o> q

3 CL Φ φ Φ <Φ tK 3 rt l 3 Ω φ er P- P- φ P- PPP P- NN φ 3 3 ω α er P- P 3 P 3 rt CO Φ Φ JP "rt P- **) 3 3 TJ ooa rt 3 ddo ^ q N

| d- φ 1 Φ Φ l_J 3 P- J o 3 N 3 o Pi DJ 3 3 3 Φ -q -q P co ∑: P

3 CL 3 3 φ co b- O P J rt 1 P o co d 3 Φ Φ a 3 P Φ 1 Φ 1 1 1 P rt b- 3 P rt 1 3 J 1 1 1 o P 1

3 rt co 1 1 υ 1 a

Switching nodes SVK2 and SVK3 are transmitted and converted back into a bundle of narrowband channels by its own transition unit. This bundle is in turn forwarded to a switching controller or a switching network of the target narrowband switching node in order to be further processed there.

Claims

claims

1. Narrowband switching node (SVKl) for establishing and clearing narrowband connections and for connecting to a broadband network (ATM) via a transition unit (IWU), which has a device for dividing a bundle of narrowband switching channels (SN) coming from the narrowband switching node has sub-bundles provided for transmitting useful information to different target narrowband communication devices (SVK2, SVK3) connected to the broadband network, characterized in that the transition unit (IWU) is integrated in the narrowband switching node (SVKl) by one in the narrowband switching node (SVKl ) according to a protocol used internally in the node, signaling information (PSIG) which is assigned in each case to the user information to be transmitted in the sub-bundles, narrow-band signaling channels added in each sub-bundle-specific manner in the sub-bundles for transmission to the broadband by the transition unit (IWU) andnetz (ATM) to pass on.

2. Method for transmitting useful and signaling information from a narrowband switching node (SVK1) connected via a transition unit (IWU) to a broadband network (ATM) to different target narrowband communication devices (SVK2, SVK3) connected to the broadband network, characterized by the following method steps : a) Splitting a bundle of narrowband user channels (SN) provided for the transmission of user information from the narrowband switching node (SVK1) to the different target narrowband communication devices (SVK2, SVK3) in accordance with a signaling information (PEM, PSIG) used according to a node-internal protocol , which are assigned to target narrowband communication devices (SVK2, SVK3), b) assigning transmission-target-specific portions of the signaling information (PSIG) to the sub-bundles assigned to the respective target narrowband communication devices (SVK2, SVK3), c) converting the bundle-specific conversion of the portions of the signaling information (PSIG) assigned to the sub-bundles and the narrowband signaling signal added to the sub-bundles channels and d) sub-bundle-specific transmission of the usage and signaling information of the sub-bundles via virtual channels (VC) of the broadband network (ATM) to the target narrow-band communication devices (SVK2, SVK3) assigned to the sub-bundles.

3. The method according to .Anspruch 2, characterized in that the target narrowband communication devices (SVK2, SVK3) in the transition unit (IWU) logical or physical ports (LP) are assigned and useful and signaling information port related to the transition unit (IWU) transmitted becomes.

4. The method according to .Anspruch 2 or 3, characterized in that in the transition unit (IWU) the target narrowband communication devices (SVK2, SVK3) associated broadband addresses logical or physical ports (LP) are assigned.

5. The method according to any one of claims 2 to 4, characterized in that the transition unit (IWU) from the narrowband switching node (SVKl) is controlled like a peripheral narrowband network module.

6. The method according to any one of claims 2 to 5, characterized in that for the partial bundle-specific transmission of useful and / or Signaling information to target narrowband communication devices (SVK2, SVK3) at least one permanent virtual channel (VC) with a defined bandwidth is available in the broadband network (ATM).

7. The method according to any one of claims 2 to 6, characterized in that at least one virtual channel (VC) in the broadband network (ATM) is available for the partial bundle-specific transmission of useful and / or signaling information to target narrowband communication devices (SVK2, SVK3) whose bandwidth is dynamically varied depending on the volume of data to be transmitted on the request of the transition unit (IWU).

8. The method according to any one of claims 2 to 7, characterized in that at least one virtual channel (VC) in the broadband network (ATM) for sub-bundle-specific transmission of user information to target narrowband communication devices (SVK2,

SVK3) is only requested by the transition unit (IWU) if user information is available in partial bundles.

9. The method according to .Anspruch 8, characterized in that when establishing a connection to a target narrowband communication device (SVK2, SVK3) via a requested for the transmission of useful information virtual channel (VC) of the broadband network (ATM) an information element to the transition unit is transmitted to the target narrowband communication device (SVK2, SVK3) that this transition unit uniquely assigns the incoming user information to a separate sub-bundle provided for this connection and previously agreed upon by exchanging signaling information via another virtual channel (VC) between the two connection partners enables.

10. The method according to claim 8 or 9, characterized in that the sub-bundles of all interconnected narrowband communication devices (SVKl, SVK2, SVK3) each have identification information that is permanently assigned when establishing a connection via a virtual channel (VC) of the broadband network (ATM ) is transmitted to the transition unit of the respective target narrowband communication device and enables this transition unit to clearly assign the incoming broadband connection to a sub-bundle.

11. The method according to any one of claims 2 to 10, characterized in that at least one virtual channel (VC) in the broadband network (ATM) for sub-bundle-specific transmission of signaling information to target narrowband communication devices (SVK2, SVK3) only when signaling information is available in sub-bundles is requested by the transition unit (IWU).