DE19705772C2 - Interface between a feeder network with wireless and wired communication terminals and a communication network - Google Patents

Description

In future feeder networks of communication networks are Communication terminals wired - d. H. wired or via fiber optic cables or via an RLL system - and connected wirelessly. With the wireless connection via a RLL system - known in the trade as "Radio in the loop" -, are connection facilities in the subscriber access area, to which the communication terminals are wired are closed, wireless or cordless with base stations connected. There are currently two for this wireless connection Standards defined: a rap standard (radio access profile) for connecting communication terminals to a / b cut and a DECT / ISDN intermediate standard for the An conclusion of ISDN communication terminals, both Stan dards regarding the air interface again on the DECT standard based. The connection devices and the wirelessly connected base stations are participating connection area of fixed communication systems niert and consequently is the radio defined in the DECT standard Roming not required.

With a cordless or wireless connection, mobile commu nication terminals are mobility management information - For example parts of the subscription data and session Key information - from the feeder network via an interface to a communication system of the communication network - at for example an ISDN communication network - and vice versa to transfer. This means that Mo balance management information to be transferred. For this interface is part of standardization pre in connection with standardization the integration of 'Cordless Terminal Mobility' (CTM) already  have been proposed in the ISDN D-channel protocol Mobili transmit management information, the for the line-bound communication terminals the cut already place for the transmission of the physical transmission layer realizing layer 1 messages, the backup layer realizing layer 2 messages and for those Network layer realizing layer 3 messages is designed.

For this, the ISDN protocol is also used DSS1 referenced, currently at ETSI (European Telecommunika tions Standards Institute) in the working group SPS-05121 in Draft 'Digital Subscriber Signaling System No. one (DSS1) Protocoll '07/07/05, is processed. That kind of about Carrying is unsuitable for those scenarios in which wired feeder networks or communication networks or additional services for individual, cordless closed and mobile participants have to be integrated because the DSS1 standardization focuses on the ISDN Pri is connected. With ISDN primary connections there is none Control of the communication network via individual services - for example for private branch exchanges. Also one Cooperation with the existing telephone network - known in the professional world as the PSTN network - is not possible.

The object underlying the invention is that Interface between the feeder network and a communica tion system of the communication network to improve. The on surrender is solved by the features of claim 1.

The essential aspect of the interface according to the invention can be seen in the fact that for wireless, mobile Communication terminals an additional layer 2 message is defined in the mobility management information as Layer 3 information is transmitted. The essential The advantage of the interface according to the invention is that hen that the mobility management information is independent whether an ISDN-oriented or a telephone network ori dated, wirelessly connected communication terminal  has initiated a connection - be transmitted. This is achieved in that within the additional Layer 2 notification for the transmission of mobility mana a layer 3 address is specified, due to the assignment of this layer 2 message to a Establishing a connection with a telephone or ISDN communication tion terminal is possible - claim 4.

The interface according to the ETSI standard V.5 is advantageous realized, the additionally defined layer 2 message (MM) for the standardized V.5.1 and V.5.2 cuts is provided and the layer 2 message by additional Liche second and third layers is realized. - Claim 2. The separation of layer 2 messages for a mobili Activity management information transmission is essentially chen by a separate, predetermined envelope function ad Resse achieved - claim 3.

According to an advantageous embodiment of the invention Interface is a layer 2 message for the mobility Management information for ISDN connections to an operator close the interface by the connection made an identification indicating the connection is - Claim 7. By this when connecting directed or stored identification can be easily Way with ISDN connections a reference during a ver Layer 2 message submitted for the mobility measure Management information transmission to a connection or Port or a transmission channel of the interface, esp the V.5 interface.

Further advantageous refinements of the interface, the in particular on the additional configuration for the lei device-bound communication terminals are coordinated the other claims.

In the following the invention with reference to four block switching pictures explained in more detail. Show

Fig. 1 is a block diagram of a network structure according to the invention with the interface,

Fig. 2 is a block diagram of an overview of the layer 2 messages,

Fig. 3 shows the protocol architecture in the communication network when connecting a telephone network Communicatonsendge devices

Fig. 4 shows the protocol architecture of the communication network when connecting an ISDN communication terminal.

Fig. 1 shows a block diagram of a communication network KN, which is represented by a feeder network AN and a communication system LE. The communication network KN can have a plurality of feeder networks AN and a number of communication systems LE connected to them - not shown. The interface according to the invention corresponds in terms of its physical and procedural properties to the ETSI standard V.5, but extended to the invention-specific protocol elements or architecture. Furthermore, FIG. 1 shows line-bound communication terminals KE ', which are connected to the feeder network AN via a connection technology AT - a communication terminal KE' and a connection technology AT are represented in FIG. 1. In the feeder network AN, the communication terminals KE 'are connected to corresponding connection devices TA / ET, through which the V5 interface is also implemented physically and procedurally. The different connection technology AT and ET specified in the feeder network AN indicates that communication terminals KE 'of different services, ie the ISDN service and the telephone service, can be connected. Here, the connection of the wired communication devices KE 'takes place in a conventional manner. Furthermore, RLL systems (radio in the loop) are also provided, by means of which the subscriber access area is bridged wirelessly, but the communication terminals are wired to the RLL systems. Two standards are currently defined for this wireless connection. The RAP standard "Radio Access Profile" for the connection of communication terminals in the telephone network and a DECT / ISDN intermediate standard for the connection of ISDN communication terminals, both standards in turn based on the air interface based on the DECT standard. For the line-bound communication terminals it is essential that the connection of the communication terminals is wire-bound and the RLL systems are stationed, ie not mobile.

Also shown in FIG. 1 are wirelessly connected mobile communication terminals KE, which are connected wirelessly to the supply network AN - indicated by a dashed line - and are connected to further terminal devices TE, for example via an ISDN interface. The se wirelessly connected, mobile communication terminals KE can in turn be implemented according to the telephone service or ISDN service with a wide variety of performance features. Corresponding to the implementation, coordinated connection units ET or TA are to be provided in the supply network AN, through which the V.5 interface V.5 is also implemented both procedurally and physically. For the realization of the mobility function of the wirelessly connected, mobile communication terminals KE, mobility management information mmi must be exchanged between the feeder network AN and the communication system LE of the communication network KN.

Fig. 2 is a block diagram for the transmission of signaling information and mobility management information via the mmi V.5 interface V.5 provided Layer 2 messages. 2 for this purpose is shown in FIG. Each have a layer-2 message service ISDN for the signaling in the telephone, a layer-2 message ISDN for signaling in ISDN service, and a layer-2 message mm for the transfer averaging of mobility Management information mmi, regardless of the type of service presented. Each of the layer 2 messages PSTN, ISDN, mm is formed by a start bit combination FLAG and an envelope function address EFA. The layer 2 message PSTN, MM for the telephone service and for the mobility management information transmission is additionally a control field CF, a protocol discriminator PD, two address fields L3ADD and further fields for information elements such as message type and the actual layer 3 Messages L3M, which contain the signaling information si and mobility management information mmi - indicated in FIG. 2 by dotted lines and the designation L3M (si), L3M (mmi). The structure of the layer 2 message PSTN, ISDN is essentially described in the ETSI standard V.5.1 or V.5.2. The envelope function address EFA is fixed in the layer 2 message PSTN for the telephone network, whereas the envelope function address EFA for layer 2 messages for the ISDN service differs per connection. This ISDN envelope function address EFA is not, as in the telephony service, on a connection or port of the V.5 interface V.5, but on the respective connection and consequently represents a connection-specific envelope function address EFA, the for the Telephone service and for the mobility management information transmission before seen or given may not be used, that is, the envelope function address EFA for the mobility management information transmission provides a different to the other different, predetermined address There are no further fields for further information inserted in the layer 2 message ISDN for the ISDN service. Furthermore, the address fields L3ADD are provided for the telephone service. In particular, the partial address fields A, B, C shown in FIG. 2 are selected differently. For example, for the telephone service only the partial address field B with a logical "1" and in an ISDN service the partial address field A, B with a logical "0" and the partial address field C with a logical 1. The layer 3 messages L3M with the mobility management information mmi for the respectively addressed services are inserted in further fields which are not described in detail.

In Fig. 3 is the conversion of the physical properties of a dural and proze be Schlos Senen by the GAP standard communication terminal KE (CAP) - ie Kommunikati onsendgerätes KE of a telephone service - prepared according to the stan dardized layers models. In Fig. 3 for the explanations of the three components essential to the invention, the communication system LE, the feeder network AN and the communication terminal connected according to the GAP standard KE (GAP) are shown.

Both for the telephone service and for the ISDN service shown in FIG. 4, three layers L1..3 are processed or three layers are implemented for the switching of connections according to the generally known ISO layer model. According to the general ISO layer model, the first layer L1 represents the physical layer, which is referred to as layer 1 or transmission layer according to the standard. In this layer L1, essentially technical transmission methods for the transmission of information, for example voice information, between the components of a communication network - in the exemplary embodiment of a telephone communication network PSTN or an ISDN communication network ISDN - are implemented. In a second layer L2 - referred to as layer 2 or data link layer in the standard - the information transmitted via the transmission layer is checked with regard to its transmission sequence and completeness. Such a check is carried out, for example, by cyclical block protection methods. In the third layer L3 - referred to in the standard as layer 3 or as a network layer - the switching information for the switching of the individual connections is inserted. The call handler information represents, for example, the origin or destination phone numbers of the respective communication terminals. The processing or the realization of the three layers L1..3 is indicated in Fig. 3 and Fig. 4 by the designations L1, L2, L3. Since a separate layer 2 message mm is provided for the transmission of the mobility management information mmi via the V.5 interface, the corresponding protocol elements in FIG. 3 and in FIG. 4 are both in the second layer L2 as well as implemented in third layer L3. According to FIG. 3, in the communication terminal KE (CAP) and the feeder network to the first layer DECT L1 and the second layer L2 DECT implemented according to the DECT standard. In a third layer CC, both the control for the telephone service and a mobility layer MML forming and transmitting the mobility management information mmi are implemented. With the help of an interworking function - indicated in FIG. 3 by the designation IWU - the first to third layer protocols L1..3 are converted into telephone protocols PSTN-L1..3. According to the invention, a separate layer 2 message is formed for the transmission of the mobility management information mmi, which means a separate second and third mobility layer MM-L2, MM-L3 in the layer model. This second and third mobility layer MM-L2, MM-L3 implemented in the feeder network AN is also implemented in the communication system LE, which in both cases is based on the first layer L1 implementing the transfer function.

In Fig. 4 are the for the explanation of the four essential components, a connected to an ISDN communication terminal KE terminal TE - for example a computer device -, a communication terminal KE, the feeder network AN and the communication system LE, wherein between the Communication system LE and the feeder network AN the V. interface V.5 according to the invention is arranged. With this arrangement of the components, it is assumed that the terminal TE is designed as an ISDN communication terminal KE and the communication terminal KE is designed as an ISDN communication terminal or telephone communication terminal, the layers of the communication terminal KE in FIG. 4 not being affected are shown. The ISDN interface S represents, for example, the ISDN base interface S0. An interworking interface DI is inserted between the communication terminal KE and the feeder network AN, via which the DECT interface and the ISDN interface can work together.

For an implementation of an ISDN telephone function or an ISDN interface, the same implementation of the three ISDN layers ISDN-L1..L3 is provided both in the communication terminal KE and in the terminal TE. In the communication terminal KE are indicated with the help of an IWU function in FIG. 4 by the designation IWU - DECT conform the first to third layers DECT -L1, DECT -L2, CC are implemented. In the third DECT layer CC, a separate layer mm is provided for the transmission of the mobility management information mmi. These three DECT layers DECT-L1, L2, CC are also implemented for cooperation in the delivery network AN. With the help of an interworking unit - indicated in FIG. 4 by the designation IWU - these three protocol layers are converted into ISDN layers or protocol layers ISDN-L1..L3.

Here, according to the invention, a separate second and third mobility layer MM-L2, MM-L3 including the protocol elements explained in FIG. 2 are formed for the transmission of the mobility management information mmi. These previously explained ISDN layers ISDN-L1..3 are also realized for a cooperation in the communication system LE. With regard to the third ISDN layer ISDN-L3 it should be noted that this is transmitted unprocessed via the DECT connection unit DECT-INT and the feeder network AN - indicated in FIG. 4 by a line with two arrows between the layers ISDN-L3.

Due to the separate transmission of the mobility manager mmi in a separate second and third Mobility Layer MM-L2, MM-L3 is a universal use V.5 interface possible, d. H. she can be both pro to the PSTN telephone service and the ISDN service Support ISDN. This is through the use of an additional layer 2 message mm possible, in which a predefined or special envelope function address EFA is used. The inventive introduction of the separate mobili tity layers MM-L2, L3 will be the greatest autonomy and Transparency - for example, independent authentication through the feeder network during connection establishment - of the feeder network reached.

Claims (7)

1. Interface (V.5) between a feeder network (AN) with cordless and wired connected communication terminals (KE) and a communication system (LE) of a communication network (KN) for a transmission of

• 1. Layer 1 messages implemented by the bit transmission layer,
• 2. layer 2 messages (PSTN, ISDN) that implement the data link layer and
• 3. Layer 3 messages (L3M) realizing the network layer for the line-bound connected communication terminals (KE), characterized in that
• 4. that a layer 2 message (MM) is additionally defined for the wirelessly connected communication terminals (KE), in which mobility management information (mmi) is transmitted as layer 3 messages (L3M).

2. Interface according to claim 1, characterized indicates that the interface (V. 5) according to the ETSI Standard V.5 is implemented, with the additionally defined Layer 2 message (MM) for the standardized V.5.1 and the V.5.2 interface is provided and the layer 2 mel dung (MM) through additional second and third layers (MM- L2, MM-L3) is realized. 3. Interface according to claim 1 or 2, characterized ge features that the Layer 2 message (MM) for the mobility management Information transmission through a given envelope Function address (EFA) is determined. 4. Interface according to one of claims 1 to 3, characterized featured, that in the Layer 2 message (MM) for mobility management ment information transmission through different  Layer 3 addresses (A, B, C) the assignment to layer 2 message gen (PSTN, ISDN) for a telephone network or an ISDN network will be shown. 5. Interface according to one of claims 1 to 4, characterized featured, that the wired communication terminals (KE) as Telephone network (PSTN) - or communication terminals (KE) ei nes digital, integrated services network (ISDN) realized are and wired and / or immobil wirelessly attached are closed. 6. Interface according to claim 5, characterized indicates that the Layer 2 message (mm) for the Signa Transmission of information for telecommunication communications tion terminals (KE ') by a predetermined envelope function ons addresses (EFA) and ISDN communication terminals (KE) through connection-specific, different envelope Function addresses (EFA) are determined. 7. Interface according to one of the preceding claims, characterized in that a layer 2 message (mm) for the mobility management information (mmi) at ISDN connections to an interface connection (V.5) by setting up the connection, one the connection indicating identification is related.