DE102006028324B4 - Message generation arrangement and method for generating a message - Google Patents

Abstract

Message generation arrangement of a communication system, comprising:
- A determination device which is set up to determine whether "Voice Call Continuity Between Circuit Switched (CS) and Internet Protocol Multimedia Subsystem (IMS)" (VCC) is supported for a first communication terminal of the communication system, so that the first communication terminal by means of packet-switching Network elements of the communication system can participate in a voice communication connection in which a second communication terminal of the communication system participates by means of circuit-switching network elements of the communication system;
a message generating device, which is set up when it has been determined that VCC is supported for the first communication terminal, to generate a message which has the information that the first communication terminal supports "Combining CS calls and IMS sessions" (CSI) that a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously between the first communication terminal and the second communication terminal.

Description

The invention relates to a message generation arrangement and a method for generating a message.

It would be desirable to be able to set up a circuit-switched communication connection and a packet-switched communication connection in parallel from one mobile radio subscriber device to another mobile radio subscriber device, even if the further mobile radio subscriber device can only use communication connections by means of the packet-switching domain of a mobile radio network and not by means of the circuit-switching domain of the mobile radio network.

DE 10 2004 029 686 A1 describes a procedure for status display in a DÜ system with different DÜ variants. The method comprises determining the status of a data transmission variant currently used for data transmission and / or at least one available data transmission variant; and generating at least one status signal that contains information on the status of the data transmission variant currently used for data transmission and / or at least one available data transmission variant. In particular, a request signal can be generated if the currently used DÜ variant relates to packet-switched data transmission and the available DÜ variant relates to circuit-switched data transmission, or vice versa. A status signal is then generated that contains information about the current (packet or circuit-switched) data transmission and / or information about an alternative (circuit or packet-switched) data transmission, the alternative data transmission being selectable by a user or a management system instead of the current data transmission is.

DE 10 2006 010 507 describes a communication system in which a user of a first communication terminal can request the establishment of a first communication connection on the condition that the second communication terminal supports it, that a second communication connection is provided at the same time as the first communication connection, the first communication connection and the second communication connection using different mediation techniques are provided. For example. The first communication link may be a circuit-switched communication link and the second communication link may be a packet-switched communication link.

WO 2006/034658 A1 describes implementations of a CSI-capable device. The cases to be implemented include the establishment of an IMS session and CS connection as part of a CSI service, as well as the behavior in the event of an abnormal termination of the CS connection and a fall back to a pure CS connection.

S. Österman, "Combining Circuit and Packet Based Services in Converging Networks", Helsinki University of Technology, Master Thesis of 13.03.2006 describes in Section 5 the feature "Circuit Switched IMS Combinational Services "( CSICs ), which has a combination of a CS connection and IMS-based services in such a way that the user experiences this as a uniform service. The service works by either adding an IMS session to an existing CS connection or adding a CS connection to an existing IMS session.

According to one exemplary embodiment of the disclosure, a message generation arrangement of a communication system is provided, which has a determining device which is set up to determine whether a first communication terminal of the communication system can use packet-switching network elements of the communication system to participate in a communication connection in which a second communication terminal of the communication system can use line-switching network elements of the communication system, and has a message generating device which is set up when it has been determined that the first communication terminal can use the packet-switching network elements to participate in a communication connection in which the second communication terminal participates by means of the circuit-switching network elements to generate a message which Has information that it supports the first communication terminal, that a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously between the first communication terminal and the second communication terminal.

• 1 zeigt ein Mobilfunk-Kommunikationssystem gemäß einem Ausführungsbeispiel der Erfindung.
• 2 zeigt ein Ablaufdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 3 zeigt ein Mobilfunk-Kommunikationssystem gemäß einem Ausführungsbeispiel der Erfindung.
• 4 zeigt ein Nachrichtenflussdiagram gemäß einem Ausführungsbeispiel der Erfindung.
• 5 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 6 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 7 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 8 zeigt ein Nachrichtenflussdiagramm gemäß dem Ausführungsbeispiel der Erfindung.
• 9 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 10 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 11 zeigt ein Nachrichtenflussdiagramm gemäß einem Ausführungsbeispiel der Erfindung.
• 12 zeigt eine Nachrichtenerzeugungsanordnung gemäß einem Ausführungsbeispiel der Erfindung.

Exemplary embodiments of the invention are shown in the figures and are explained in more detail below.

• 1 shows a mobile radio communication system according to an embodiment of the invention.
• 2 shows a flow chart according to an embodiment of the invention.
• 3 shows a mobile radio communication system according to an embodiment of the invention.
• 4 shows a message flow diagram according to an embodiment of the invention.
• 5 shows a message flow diagram according to an embodiment of the invention.
• 6 shows a message flow diagram according to an embodiment of the invention.
• 7 shows a message flow diagram according to an embodiment of the invention.
• 8th shows a message flow diagram according to the embodiment of the invention.
• 9 shows a message flow diagram according to an embodiment of the invention.
• 10 shows a message flow diagram according to an embodiment of the invention.
• 11 shows a message flow diagram according to an embodiment of the invention.
• 12 shows a message generation arrangement according to an embodiment of the invention.

In Europe, work is currently underway to develop and standardize third generation mobile radio systems. For example, the "Universal Mobile Telecommunications System" (UMTS), which is being developed as part of the 3rd Generation Partnership Project (3GPP), is of great importance.

3GPP is currently working on the “Combining CS calls and IMS sessions "( CSI ) worked. CSI should enable two users of a mobile radio communication system to use a circuit-switched telecommunication connection and a packet-switched communication connection in parallel in order to send data to one another. A circuit switched telecommunication connection is also called CS Call called, and is by means of CS (Circuit Switched) domain, that is, the circuit-switching domain, of the mobile radio communication system.

One in the context of CSI Packet-switched communication connection provided is one IMS (Internet Protocol-Multimedia Sub-System) session by means of the PS (Packet Switched) domain of the mobile radio communication system is provided. The signaling for the packet-switched communication connection or for the communication service, which is provided by means of the packet-switched communication connection, is carried out by means of the IMS of the mobile radio communication system, which is an extension of the PS core network ( PS Core) can be seen performed. As a protocol for the transmission of signaling data in IMS the Session Initiation Protocol ( SIP ) used.

An example of the use of CSI is explained below. A user of a mobile radio communication system has just bought a new car and calls a friend who is also a user of the mobile radio communication system, that is, establishes a circuit-switched (mobile) telecommunications connection between him and his friend, or between them Mobile subscriber devices used in each case. It is assumed that the cellular subscriber device used by the user and the cellular subscriber device used by his friend CSI support. The user is shown on a display of his mobile radio subscriber device that the mobile radio subscriber device used by his friend CSI supported. The user then uses an IMS session to send a digital photo of the car to his friend, which he has taken, for example, using a digital camera integrated in his mobile radio subscriber device.

It is envisaged that the user will be able to use an IMS session, in this example for sending a photo, in the context of the circuit-switched telecommunication connection. In particular, it should not be necessary for the user to switch to a specific application on his mobile radio subscriber device during the phone call or to select his friend as a subscriber to the IMS session in a phone book.

The possibility that a circuit-switched telecommunication connection and a packet-switched communication connection exist between two mobile radio subscriber devices at the same time exists in UMTS mobile radio communication systems and also in the older GSM (Global System for Mobile Communications) EDGE (Enhanced Data Rates for GSM Evolution) - mobile communication systems. In the radio access network of a GSM-EDGE mobile radio communication system, i.e. a GSM EDGE Radio Access Network (GERAN), this is called Dual Transfer Mode ( DTM ) Capability. In the radio access network of a UMTS mobile radio communication system, that is to say a UMTS terrestrial radio access network (UTRAN), this is referred to as multi radio access bearer (MultiRAB) capability.

At CSI, in addition to the technical possibility of being able to provide both a circuit-switched telecommunication connection and a packet-switched communication connection between two users, the two users, for example if they use a circuit-switched telecommunication connection speak to each other, be informed about the possibility of simultaneously providing a packet-switched communication service combined with the circuit-switched telecommunication connection.

Furthermore, if the two users make use of this possibility and an IMS session exists in parallel with, in other words simultaneously with, a circuit-switched telecommunications connection, the users should be presented with the circuit-switched telecommunications connection and the IMS session in a single context.

• • „Radio Capability Exchange“: Zwei Mobilfunk-Teilnehmergeräte tauschen aus, ob sie (momentan) CSI unterstützen. Um CSI zu unterstützen, muss jedes Mobilfunk-Teilnehmergerät die DTM Capability oder die Multi RAB Capability aufweisen und die momentane funktechnische Situation an den Orten, an denen sich die Mobilfunk-Teilnehmergeräte befinden, muss eine parallele Nutzung einer leitungsvermittelten Telekommunikationsverbindung und einer paketvermittelten Kommunikationsverbindung ermöglichen. Für den Fall, dass eine leitungsvermittelte Telekommunikationsverbindung zwischen den beiden Mobilfunk-Teilnehmergeräten besteht und noch keine paketvermittelte Kommunikationsverbindung zwischen den beiden Mobilfunk-Teilnehmergeräten besteht, erfolgt dieser Austausch mittels der CS-Domäne des Mobilfunk-Kommunikationssystems.
• • „SIP based UE Terminal Capability Exchange“: Zwei Mobilfunk-Teilnehmergeräte tauschen aus, welche Kommunikationsdienste (mit welchen Parametern), die mittels der PS-Domäne des Mobilfunk-Kommunikationssystems bereitgestellt werden, sie unterstützen. Der Austausch dieser Information erfolgt mittels der Signalisierung der PS-Domäne und kann jederzeit erfolgen, das heißt auch vor dem Aufbau einer leitungsvermittelten Telekommunikationsverbindung oder einer IMS-Sitzung zwischen den beiden Mobilfunk-Teilnehmergeräten.
• • „MSISDN Number Exchange in SIP“: Zwei Mobilfunk-Teilnehmergeräte tauschen mittels der IMS-Signalisierung die Telefonnummern der jeweiligen Benutzer aus.
• • „Establishing Parallel Connections“:
  • ◯ erster Fall: Herstellung einer IMS-Sitzung zwischen zwei Mobilfunk-Teilnehmergeräten parallel zu einer zwischen den beiden Mobilfunk-Teilnehmergeräten bereits bestehenden leitungsvermittelten Telekommunikationsverbindung;
  • ◯ zweiter Fall: Aufbau einer leitungsvermittelten Telekommunikationsverbindung zwischen zwei Mobilfunk-Teilnehmergeräten parallel zu einer bereits bestehenden IMS-Sitzung zwischen den beiden Mobilfunk-Teilnehmergeräten.

As part of the work item CSI the following procedures are specified for this:

• • "Radio Capability Exchange": Two mobile radio user devices exchange whether they (currently) CSI support. Around CSI to support, each mobile radio subscriber device must DTM Capability or the multi RAB Capability and the current radio technical situation at the locations where the mobile radio subscriber devices are located, must allow a parallel use of a circuit-switched telecommunication connection and a packet-switched communication connection. In the event that there is a circuit-switched telecommunications connection between the two mobile radio subscriber devices and there is still no packet-switched communication connection between the two mobile radio subscriber devices, this exchange takes place by means of the CS domain of the mobile radio communication system.
• • "SIP based UE Terminal Capability Exchange “: Two mobile radio user devices exchange which communication services (with which parameters), which are provided by means of the PS domain of the mobile radio communication system, support them. This information is exchanged by means of the signaling of the PS domain and can take place at any time, that is also before the establishment of a circuit-switched telecommunication connection or an IMS session between the two mobile radio subscriber devices.
• • "MSISDN Number Exchange in SIP": Two mobile radio user devices exchange the telephone numbers of the respective users using the IMS signaling.
• "Establishing Parallel Connections":
  • ◯ first case: establishing an IMS session between two mobile radio subscriber devices in parallel with a circuit-switched telecommunications connection already existing between the two mobile radio subscriber devices;
  • ◯ second case: establishment of a circuit-switched telecommunications connection between two mobile radio subscriber devices in parallel to an already existing IMS session between the two mobile radio subscriber devices.

The example described above, in which a user sends a photo to another user in parallel to a circuit-switched telecommunications connection using an IMS session, is an application of the Establishing Parallel Connections procedure mentioned above.

As part of the 3GPP, a work item called “Voice Call Continuity Between CS and IMS "( VCC ) discussed. The VCC functionality should enable a voice communication connection to exist between a first user who is connected to the voice communication connection by means of the CS (circuit switched) domain participates, and a second user who is on the voice communication link by means of the PS (packet switched) domain participates.

For example, a voice communication connection, which the first user initiates by means of units of the CS domain, is to be set up to the second user by means of units of the PS domain. For example, it should be possible to carry out a handover from the CS domain to the PS domain or vice versa for an existing voice communication connection without interruption. This means that, for example, the second user first takes part in the voice communication link using the CS domain and after the handover takes part in the communication link using the PS domain, or vice versa.

If a communication connection is initiated to a mobile radio subscriber device for which VCC is supported, the establishment of the communication link is signaled to a special control unit, which is referred to in a UMTS communication system, for example as a VCC application. This control unit decides by means of which domain the mobile radio subscriber device participates in the communication connection, in other words, by means of which domain, the PS domain or the CS domain, the mobile radio subscriber device is sent the communication connection. This decision is made on the basis of the domains in which the mobile radio subscriber device is currently registered and which domain should preferably be used in accordance with a specification by the user of the mobile radio subscriber device or also by the operator of the corresponding mobile radio network.

Is there a communication link between two mobile radio subscriber devices on the if one of the two mobile radio subscriber devices participates by means of the CS domain and the other mobile radio subscriber device participates by means of the PS domain, the communication data that are transmitted between the two mobile radio subscriber devices are converted. If a user initiates a communication connection to a mobile radio subscriber device for which VCC is supported, the user (or the mobile radio subscriber device used by him) is not signaled by means of which domain the mobile radio subscriber device participates in the communication connection.

An example of the use of the functionality according to VCC is provided, is explained below. A user of a cellular subscriber device is at home. He operates his own WLAN at home (wireless local area network) and uses a communication connection to a mobile radio network by means of a DSL (Digital Subscriber Line) communication connection and a WLAN communication connection between his mobile radio subscriber device and his DSL modem.

By means of the communication connection to the mobile radio network, the user can, for example, use a VoIP communication service and make a telephone call with another user. The other user takes part in the call by means of the mobile radio network and the communication data sent by the user is forwarded to the other user by means of the mobile radio network.

The user of the mobile radio subscriber device can also use his WLAN to accept telephone calls, that is to say to participate in communication connections that were initiated by means of units of the CS domain. For this purpose, the caller can simply dial the telephone number of the user (that is, the telephone number of the mobile radio subscriber device) and a VCC unit, for example a VCC application, ensures that the call is made using the PS domain, in this case using the DSL -Communication connection, is forwarded to the mobile radio subscriber device and, if the user accepts the call, a voice communication connection is established, in which the user takes part using units of the PS domain and the caller uses units of the CS domain.

If the user leaves his home and the coverage area of his WLAN, a handover of the voice communication connection, for example to the mobile radio network, is carried out, so that the user then uses the air interface of the mobile radio network and units of the CS domain of the mobile radio network on the voice communication connection participates.

As part of the work item " CSI Interworking "are discussed functionalities that link several communication services with CSI affect.

According to one exemplary embodiment of the invention, a message generation arrangement of a communication system is provided, which has a determining device which is set up to determine whether a first communication terminal of the communication system can use packet-switching network elements of the communication system to participate in a communication connection in which a second communication terminal of the communication system can use line-switching network elements of the communication system, and has a message generating device which is set up when it has been determined that the first communication terminal can use the packet-switching network elements to participate in a communication connection in which the second communication terminal participates by means of the circuit-switching network elements to generate a message which Has information that it supports the first communication terminal, because ss a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously between the first communication terminal and the second communication terminal.

According to a further exemplary embodiment of the invention, a method for generating a message according to the described message generating arrangement is provided.

The further refinements of the invention, which are described in connection with the message generation arrangement, also apply mutatis mutandis to the method for generating a message.

Clearly, according to one embodiment of the invention, a message is generated, by means of which it can be signaled that a circuit-switched communication connection and a packet-switched communication connection can exist in parallel between the first communication terminal and the second communication terminal, even in the event that the first communication terminal only has communication connections using the PS domain can use.

Since it is provided, for example in conventional mobile radio communication systems, that a mobile radio subscriber device only signals that it is currently CSI if it supports the DTM capability or the multi RAB Capability and the current radio technical situation at the place where the mobile Subscriber device is located, a parallel use of a circuit-switched telecommunications connection and a packet-switched communication connection enables, the use of the message generation arrangement according to the embodiment of the invention described above has the advantage that CSI can be used even if one of the two participating mobile radio subscriber devices can only participate in communication connections by means of the PS domain.

The exemplary embodiment of the invention described above thus makes it possible, for example, that if for a mobile radio subscriber device VCC is supported by the mobile radio subscriber device CSI is used, although it can only use communication connections via the PS domain and not via the CS domain.

According to an embodiment of the invention, a mobile radio user device signals for VCC is supported and accordingly CSI can use it CSI can use, that is to say that a further mobile radio subscriber device can set up in parallel a circuit-switched communication connection and a packet-switched communication connection to the mobile radio subscriber device.

The communication system can be designed in accordance with the 3GPP standard. In one exemplary embodiment, the communication system can also be another communication system, by means of which CS domain-based and PS domain-based communication services can be provided. These communication services can be carried out by the first communication terminal, for example by means of a communication network according to DECT (Digital Enhanced Cordless Telecommunications), xDSL (DSL: Digital Subscriber Line), for example ADSL (Asynchronous DSL), ADSL2 +, VDSL (Very High Data Rate DSL), SDSL (Symmetrical DSL), or according to WLAN (Wireless Local Area Network), WiMAX (Worldwide Interopability for Microwave Access), GSM (Global System for Mobile Communications) or UMTS.

In the message generation arrangement according to an embodiment of the invention, the signaling device is arranged in the first communication terminal.

The communication system can have a communication network and the signaling device can be a unit of the communication network.

In one embodiment of the invention, the message is generated as part of a protocol conversion from a signaling protocol used by the packet-switching network elements to a signaling protocol used by the circuit-switching network elements.

The signaling protocol used by the packet switching network elements is, for example SIP (Session Initiation Protocol). The signaling protocol used by the circuit switching network elements is, for example SS7 (Signaling System Number 7).

In one embodiment of the invention, the communication network is a mobile radio communication network. The first communication terminal can accordingly be a mobile radio subscriber device. The communication system can also be a landline network or can have a landline network, for example a landline network according to NGN (Next Generation Network).

The message generating device can be set up to generate the message when the first communication terminal is registered with a network element of the communication system for the use of packet-switched communication connections

The determination device is set up, for example, to determine whether for the first communication terminal VCC is supported.

In one embodiment of the invention, the message has the information that the first communication terminal CSI supported.

1 shows a mobile radio communication system 100 according to an embodiment of the invention.

The cellular communication system 100 has a first mobile radio subscriber device 101 and a second mobile radio subscriber device 102 on. The cellular communication system 100 is designed, for example, according to the UMTS (Universal Mobile Telecommunications System) standard or according to the GSM (Global System for Mobile Communications) EDGE (Enhanced Data Rates for GSM Evolution) standard. The cellular communication system 100 can also be designed according to CDMA2000 or FOMA (Freedom of Mobile Multimedia Access).

In this exemplary embodiment, it is assumed that the mobile radio communication system 100 is designed according to the UMTS standard. Accordingly, the mobile subscriber devices 101 . 102 also referred to as user equipment (UEs).

The first mobile subscriber device 101 and the second mobile radio subscriber device 102 are set up by means of a cellular communication network 103 communicate with each other, i.e. exchange data. The first mobile subscriber device 101 assigns a first CS client unit 104 on. The second cellular subscriber device 102 assigns a second CS client unit 105 on. The CS client units 104 . 105 are used to use circuit-switched telecommunications connections by the CS (Circuit Switched) core network 106 ( CS Core) of the mobile radio communication network can be provided.

To use a circuit-switched communication connection between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 the CS client units communicate 104 . 105 by means of the radio access network 115 (RAN, Radio Access Network) with the CS core network 106 , The transmission of signaling data between the CS client units 104 . 105 and the CS core network 106 is through the arrows 107 indicated. The transmission of user data between the CS client units 104 . 105 and the CS core network 106 is through the arrows 108 indicated. The transmission of signaling data within the CS core network 106 is through the arrow 109 indicated and the transmission of user data within the CS core network 106 is through the arrow 110 indicated.

The CS client units 104 . 105 as well as the CS core network 106 are part of the CS domain of the mobile radio communication system 100 , By means of the CS core network 106 can the user of the first mobile radio subscriber device 101 and the user of the second mobile radio subscriber device 102 For example, use a voice communication link, that is, make phone calls, or use a video communication link.

The first mobile radio user device points to the use of packet-switched communication services 101 a first IMS (Internet protocol multimedia sub-system) client unit 111 on and the second mobile subscriber device 102 assigns a second IMS client unit 112 on.

Packet-switched communication services are carried out using the PS (Packet Switched) core network 113 (PS Core) and the IMS core network 114 (IMS Core) provided. The IMS client units 111 . 112 , the PS core network 113 as well as the IMS core network 104 are part of the PS domain of the mobile radio communication system 100 ,

In the context of a packet-switched communication service, the data transmission between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 enables the user data by means of the radio access network 115 and by means of the PS core network 113 communicated as indicated by the arrow 116 is indicated. Signaling data, however, are by means of the radio access network 115 , the PS core network 113 and through the IMS core network 114 conveyed as it is by the arrows 117 is indicated. The transmission of signaling data within the IMS core network is indicated by the arrow 118 indicated.

The IMS core network 114 can be used with one or more application server units 119 be coupled. An application server unit 119 for example, charges for packet-switched communication services using the IMS core network 114 are provided, or by other application-specific functions. An application server unit 119 can also be a CSI application server unit ( CSI Application Server, CSI-AS). The CSI application server unit is, for example, the registration status of the first mobile radio subscriber device 101 in the IMS core network 114 or in the CS core network 106 known and it can on the forwarding of media streams from the mobile radio user equipment 101 be sent or to the mobile radio subscriber device 101 are to be sent in the CS domain or the PS domain of the mobile radio communication system 100 decide.

In this exemplary embodiment, the first mobile radio subscriber device 101 VCC supported. For this is a VCC application server unit 120 intended. Initiates the second cellular subscriber device 102 for example a voice communication connection to the first mobile radio subscriber device 101 , that is, requires the establishment of a voice communication connection to the first mobile radio subscriber device 101 , this request from the VCC application server unit 120 communicated. The VCC application server unit decides whether the voice communication connection to the first mobile radio subscriber device by means of the PS domain or by means of the CS domain 101 is forwarded, that is, whether the voice communication connection is set up in such a way that the first mobile radio user device takes part in the voice communication connection by means of units of the PS domain or in such a way that the first mobile radio user device takes part in the using the units of the CS domain Voice communication link participates.

This decision can be made by the VCC application server unit 120 for example, based on Preferences of the user of the first mobile radio subscriber device 101 or the network operator of the home network of the user of the first mobile radio subscriber device 101 to meet. The home network of the user of the first mobile radio subscriber device 101 is the sub-network of the mobile radio communication network 103 , in which the user of the first mobile radio subscriber device 101 has subscribed. The decision of the VCC application server unit 120 is also made based on whether there is a possibility that the mobile radio subscriber device 101 Communication connections using the PS domain or the CS domain uses.

The VCC application server unit 102 enables a voice communication connection to the first mobile radio subscriber device 101 can be set up if there is a possibility that the mobile radio subscriber device 101 Communication connections using the PS domain or the CS domain uses. For example, a voice communication connection from the second mobile radio subscriber device 102 to the first mobile radio subscriber device 101 be set up, even if the second mobile radio subscriber device 102 would like to participate in the voice communication connection by means of the CS domain and the first mobile radio user device can only participate in communication connections by means of the PS domain.

As for the first mobile subscriber device 101 VCC is supported, the first mobile radio subscriber device supports 101 also CSI, that is, it can for example be parallel to a communication link between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 on which the first mobile subscriber devices 101 using the PS domain of the cellular network 103 and the second mobile radio subscriber device 102 using the CS domain of the cellular network 103 participates, a packet-switched communication link between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 being constructed.

For example, a voice communication connection or a video communication connection that the second mobile radio subscriber device 102 has initiated and on which the first mobile subscriber device 101 using the PS domain of the cellular network 103 participates, a packet-switched communication link between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 be set up so that the use of packet-switched communication services between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 is made possible, for example, the transmission of files, for example digital images, between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 ,

A sequence according to which the first mobile radio subscriber device is described is described below 101 in one embodiment, determines whether it CSI supported.

2 shows a flow chart 200 according to an embodiment of the invention.

The in 2 The process shown is carried out by the first mobile radio subscriber device 101 performed, for example by a control device in the first mobile radio subscriber device 101 is provided and for example by means of a microprocessor of the first mobile radio subscriber device 101 is realized.

The sequence serves the first mobile radio subscriber device 101 determines if it CSI supported. The information whether the first mobile radio subscriber device 101 CSI supported, is signaled by the value of a parameter called Radio Environment. Supports the first cellular subscriber device 101 CSI , the parameter Radio Environment is set to one and supports the first mobile radio user device 101 CSI not, the Radio Environment parameter is set to zero.

In 201 begins the procedure for determining the value of the Radio Environment parameter.

In 202 it is checked whether the first mobile radio subscriber device 201 a communication link using the CS domain of the cellular network 103 can establish and thus a communication link using the CS domain of the mobile network 103 can use. If the result of the check is positive, that means the first mobile radio user device can 101 a communication link using the CS domain of the cellular network 103 build or use, so with 203 continued. If the result of the check is negative, use 204 continued.

In 204 it is checked whether for the first mobile radio subscriber device 101 VCC is supported. Used for the first mobile subscriber device 101 VCC is supported, so with 203 continued. Will that be for the first mobile subscriber device 101 VCC is not supported, the parameter Radio Environment in 205 set to zero.

In 203 it is checked whether the first mobile radio subscriber device 101 in the IMS core network 114 is registered and thus communication connections by means of the PS domain of the mobile radio network 103 can use. Is the first mobile subscriber device 101 not in the IMS core network 114 the Radio Environment parameter is registered in 205 set to zero. Is the first mobile subscriber device 101 in the IMS core network 114 the Radio Environment parameter is registered in 206 set to the value one.

It's going to be like regarding 1 described, assumed that for the first mobile radio subscriber device 101 VCC is supported, but that the first mobile subscriber device 101 currently no communication connections using the CS domain of the mobile radio network 103 can use.

Accordingly, in 202 found that no communication connection can be established using the CS domain and it is connected with 204 continued. In 204 it is found that currently VCC for the first mobile subscriber device 101 is supported and it will be with 203 continued. In 203 it is determined that the first mobile subscriber device 101 in the IMS core network 114 is registered and accordingly with 206 continued and the Radio Environment parameter set to one.

The radio environment parameter is used by the first mobile radio subscriber device 101 as part of the establishment of a communication link between the first mobile radio subscriber device 101 and the second mobile radio subscriber device 102 to the second mobile radio subscriber device 102 transmitted. Several cases can occur. An overview of cases that can occur according to an embodiment of the invention is in 3 shown.

3 shows a mobile radio communication system 300 according to an embodiment of the invention.

The cellular communication system 300 has a first mobile radio subscriber device 301 , the first mobile subscriber device 101 in 1 corresponds, and a second mobile radio subscriber device 302 , the second mobile radio subscriber device 102 in 1 corresponds to. The units of the cellular network 103 that related to 1 have been described in more detail in 3 to network elements 303 summarized.

The first mobile subscriber device 301 points like with reference to 1 described a first CS client unit 304 on. As mentioned above, it is assumed that the first mobile radio subscriber device 301 currently no communication connections using the CS domain of the mobile radio network 103 can build up. The CS client unit 304 is therefore not in operation, which is due to the black cross 306 is indicated by means of which the first CS client unit 304 in 3 is crossed out. The second cellular subscriber device 302 points like with reference to 1 described a second CS client unit 305 on.

The first mobile subscriber device 301 assigns a first IMS client unit 307 on. The second cellular subscriber device 302 assigns a second IMS client unit 308 on how it relates to 1 is described.

In 3 four use cases are illustrated. The first case is indicated by a first arrow 309 symbolizes the second case is represented by a second arrow 310 symbolizes the third case by a third arrow 311 symbolizes and the fourth case is represented by a fourth arrow 312 symbolizes.

In the first case, the second mobile radio subscriber device builds 302 by means of the CS domain a communication connection, for example a voice communication connection or a video communication connection, to the first mobile radio subscriber device 302 on. The first mobile subscriber device 301 participates in this communication link using the PS domain.

In the second case, the first mobile radio subscriber device establishes a communication link, for example a voice communication link or a video communication link, to the second mobile radio subscriber device 302 that uses the second mobile radio subscriber device by means of the CS domain.

In the third case, the first mobile radio user device initiates 301 a packet-switched communication link to the second mobile radio subscriber device 302 and in the fourth case the second mobile radio subscriber device is built 302 a packet-switched communication link to the first mobile radio subscriber device 301 on, that is, initiates the establishment of a packet-switched communication connection to the first mobile radio subscriber device 301 ,

The message flow in the first case according to an embodiment of the invention is in 4 shown.

4 shows a message flow diagram 400 according to an embodiment of the invention.

The message flow shown takes place between a first mobile radio subscriber device 401 , a second mobile radio subscriber device 402 and network elements 403 instead of like with reference to 3 are arranged and designed as described.

In 404 requests the second mobile radio subscriber device 402 the establishment of a communication link on which the second mobile radio subscriber device 402 wants to participate via the CS domain by sending a setup message 413 to the network elements 403 on. Since the second mobile subscriber device 402 The network element is the network element by means of the CS domain that would like to use the communication connection to be set up 403 that the setup message 413 receives an element of the CS domain. The setup message 413 contains the information that the second mobile radio subscriber device 402 currently CSI supports in the form of the parameter Radio Environment, which is set to the value one.

In 405 becomes the setup message 413 from a network element of the network elements 403 in an invite message 414 converted. The setup message 413 is according to the SS7 (Signaling System No.7) and the Invite message 414 is according to the SIP (Session Initiation Protocol) protocol designed. The conversion of the setup message 413 in the invite message 414 corresponds to a conversion of the SS7 protocol into the SIP protocol. This is done because the first mobile subscriber device 401 should participate in the communication connection to be set up using the PS domain, since it cannot currently establish a communication connection using the CS domain.

In 406 becomes the invite message 414 to the first mobile radio subscriber device 401 transmitted. The Invite message 414 contains the information that the second mobile radio subscriber device 402 currently CSI supports in the form of the parameter Radio Environment, based on the value 1 is set.

In 407 sets the first mobile subscriber device 401 the Radio Environment parameter to one according to the determination of the value of the Radio Environment parameter as it is related to 2 is explained. In 408 transmits the first mobile radio subscriber device 401 a 200 OK message 415 to the network elements in accordance with the SIP protocol 403 , The 200 OK message 415 contains the parameter Radio Environment, which according to 407 on the value 1 is set.

The 200 OK message 415 is from a network element of the network elements 403 belonging to the PS domain, received and the 200 OK message 415 will be in a connect message 416 , which is designed according to the SS7 protocol.

In 411 becomes the connect message 416 to the second mobile radio subscriber device 402 transmitted. The Connect message 416 contains the information that the first mobile subscriber device 407 currently CSI supports in the form of the parameter Radio Environment set to the value one.

As the first mobile subscriber device 407 by means of the invite message 414 and the parameter Radio Environment contained therein with the value one has contained the information that the second mobile radio subscriber device 402 currently CSI is supported in 409 by means of the user interface, for example a display, to the user of the first mobile radio subscriber device 401 displayed that the first mobile subscriber device 401 CSI supported.

Analog is in 412 the user of the second mobile radio subscriber device 402 displayed that the first mobile subscriber device 401 currently CSI supports what the second mobile subscriber device 402 using the Connect message 416 has been signaled.

The network element of the network elements 403 that the processes 405 and 410 performs, that is, converts the SS7 signaling into a SIP signaling and vice versa, is for example an MGCF (Media Gateway Control Function), which is part of the home network of the user of the first mobile radio subscriber device 401 is.

The message flow according to an embodiment of the invention in the second case is in 5 shown

5 shows a message flow diagram 500 according to an embodiment of the invention.

Analogous to 4 the message flow shown is found between a first mobile radio subscriber device 501 , a second mobile radio subscriber device 502 and network elements 503 instead of.

In 504 sets the first mobile subscriber device 501 the Radio Environment parameters set to one according to the process related to 2 is explained.

In 505 transmits the first mobile radio subscriber device 501 an invite message 513 which, in the form of the Radio Environment parameter set to one, contains the information that the first mobile radio subscriber device 501 currently CSI supported. A network element of the network elements 503 that is part of the PS domain receives the Invite message 513 ,

In 506 becomes the invite message 513 in a setup message 514 converted. The Invite message 513 is designed according to the SIP protocol and the setup message 514 is according to the SS7 Protocol designed. The network element that performs this conversion is, for example, an MGCF. The setup message 514 contains the information that the first mobile subscriber device 501 currently CSI supports in the form of the parameter Radio Environment, which is set to the value one.

The setup message 514 is from the second mobile radio subscriber device 502 received, which its user in 508 indicates that the first mobile subscriber device 501 CSI currently supports what the second mobile subscriber device 502 using the in the setup message 514 containing radio environment parameter has been displayed.

In 509 transmits the second mobile radio subscriber device 502 a connect message 515 to the network elements 503 , by means of which the establishment of the communication connection to the first mobile radio subscriber device 501 by means of the Invite message 513 was requested, is accepted. The Connect message 515 is designed in accordance with the SS7 protocol, which corresponds to the fact that the communication connection from the second mobile radio subscriber device 502 should be used by means of the CS domain. The Connect message 515 contains the Radio Environment parameter set to one, which is used to indicate that the second mobile radio subscriber device 502 currently also supports CSI.

In 510 becomes the connect message 515 in a 200 OK message 516 converted, which also contains the parameter Radio Environment set to one. The conversion is made by a network element of the network elements 503 made, for example, by an MGCF.

In 511 will the 200 OK message 516 to the first mobile radio subscriber device 501 transmitted. In 512 shows the first mobile radio subscriber device 501 the user of the first mobile radio subscriber device 501 that the second mobile subscriber device 502 currently CSI supported.

In 6 the message flow for the third application is shown according to an embodiment of the invention.

6 shows a message flow diagram 600 according to an embodiment of the invention.

The message flow shown is analogous to 4 between a first mobile radio subscriber device 601 , a second mobile radio subscriber device 602 , and network elements 603 instead of.

In 604 sets the first mobile radio subscriber device according to the in 2 shown procedure the parameter Radio Environment to the value one.

In 605 sends the mobile radio subscriber device 601 an invite message 611 to the network elements 603 , by means of which the establishment of a packet-switched communication connection to the second mobile radio subscriber device 602 requests. The Invite message 611 contains the parameter Radio Environment set to the value one and thus the information that the first mobile radio subscriber device 601 currently CSI supported. The Invite message 611 is in 606 to the second mobile radio subscriber device 602 forwarded.

In 607 the user of the second mobile radio user device is shown that the first mobile radio user device 601 currently CSI supported. The second mobile radio subscriber device determines this information 602 from the invite message 611 , It is assumed that the user of the second mobile radio subscriber device 602 agrees to the establishment of the requested communication connection. Correspondingly transmitted in 608 the second mobile radio subscriber device 602 a 200 OK message 612 to the network elements 603 ,

The 200 OK message 612 contains, in the form of the Radio Environment parameter set to one, the information that the second mobile radio subscriber device 602 currently CSI supported.

In 609 will the 200 OK message 612 from the network elements 603 to the first mobile radio subscriber device 601 forwarded. In 610 shows the first mobile radio subscriber device 601 the user of the first mobile radio subscriber device 601 indicates that the second mobile radio subscriber device 602 currently supports CSI. The first mobile radio subscriber device determines this information 601 from the 200 OK message 612 , The Invite message 611 and the 200 OK message 612 are designed according to the SIP protocol.

The message flow according to an embodiment of the invention for the fourth application is in 7 shown.

7 shows a message flow diagram 700 according to an embodiment of the invention.

Analogous to 4 the message flow shown is found between a first mobile radio subscriber device 701 a second mobile radio subscriber device 702 and network elements 703 instead of.

In 704 requests the second mobile radio subscriber device 702 building a packet-switched communication link between the second mobile radio subscriber device 702 and the first mobile radio subscriber device 701 by means of an invite message 711 on. The Invite message 711 contains the information that the second mobile radio subscriber device 702 current CSI supports in the form of the parameter Radio Environment with the value one. The Invite message 711 is from the network elements 703 in 705 forwarded.

The first mobile subscriber device 701 receives the invite message 711 and puts in 706 the Radio Environment parameter to the value one as it relates to 2 has been described. It is assumed that the user of the first mobile radio subscriber device 701 agrees to the establishment of the packet-switched communication connection. The first mobile radio subscriber device accordingly sends 701 in 708 a 200 OK message 712 , by means of which the establishment of the packet-switched communication connection is accepted, to the network elements 703 , The 200 OK message 712 contains the parameter Radio Environment with the value 1 , so that it is signaled that the first mobile radio subscriber device 701 currently CSI supported.

In 709 will the 200 OK message 712 from the network elements 703 to the second mobile radio subscriber device 702 forwarded. In 710 becomes the user of the second mobile radio subscriber device 702 displayed that the first mobile subscriber device 701 currently supports CSI.

Analog is in 707 the user of the first mobile radio subscriber device 701 displayed that the second mobile subscriber device 702 currently CSI supported. The Invite message 711 and the 200 OK message 712 are designed according to the SIP protocol.

In the embodiments related to 4 . 5 . 6 and 7 have been described, the first mobile radio subscriber device determines 701 according to the in 2 The sequence shown represents the value of the Radio Environment parameter that it sends to the second mobile radio subscriber device 302 transmitted. The following are with reference to 8th . 9 . 10 and 11 Exemplary embodiments are explained in which a network element uses the radio environment parameter in accordance with the fact that the first mobile radio subscriber device 301 CSI supported, set to the value one and to the second mobile radio subscriber device 302 transmitted. These exemplary embodiments have the advantage that the first mobile radio subscriber device 301 Compared to conventional mobile radio subscriber devices, it does not have to have any expanded functionality, but rather only a network element must be provided that uses the radio environment parameter in accordance with the current capability of the first mobile radio subscriber device 301 CSI to support or not.

Such an embodiment for the first application is in 8th shown.

8th shows a message flow diagram 800 according to the embodiment of the invention.

The message flow shown is analogous to 4 between a first mobile radio subscriber device 801 , a second mobile radio subscriber device 802 and network elements 803 instead of.

In 804 requests the second mobile radio subscriber device 802 by means of the CS domain the establishment of a communication connection, for example a voice communication connection or a video communication connection, by sending a setup message 812 to the network elements 803 on. The setup message 812 contains the parameter Radio Environment, which is set to the value one, and in this way signals that the second mobile radio subscriber device 802 currently CSI supported because it can both establish communication connections using the CS domain and also use packet-switched communication connections using the PS domain.

A network element of the network elements 803 , such as an MGCF, converts the setup message 812 in an invite message 813 um, that is, performs a protocol conversion from the SS7 protocol to the SIP protocol. The Invite message 813 is in 806 from the network elements 803 to the first mobile radio subscriber device 801 transmitted.

The Invite message 813 contains the Radio Environment parameter, which is set to one. The network element that is the setup message 812 in the invite message 813 converts, in other words, an invite message 813 to the setup message 812 generated, leaves the value of the parameter Radio Environment unchanged during the conversion. The Radio Environment parameter in the Invite message points accordingly 813 the value one. In one embodiment, the Radio Environment parameter in the setup message 812 has the value zero since the second mobile radio subscriber device 802 currently CSI not supported, the Radio Environment parameter also points in the Invite message 813 the value zero.

In 807 shows the first mobile radio subscriber device 801 the user of the first mobile radio subscriber device 801 indicates that the second mobile radio subscriber device 802 CSI currently supports what the first mobile subscriber device 801 by the Radio Environment parameter in the Invite message 813 has been signaled.

It is assumed that the user of the first mobile radio subscriber device 801 agrees to the establishment of the communication connection. Accordingly, the first mobile subscriber device sends in 808 a 200 OK message to the network elements 803 , In contrast to that with regard to 4 described embodiments has the 200 OK message 814 does not have the Radio Environment parameter set to one, but does not have the Radio Environment parameter or has the Radio Environment parameter with any value.

In 809 determines a network element of the network elements 803 whether the first mobile subscriber device 801 currently CSI supported. This happens, for example, in the same way as on the 2 described procedure. The network element sets the Radio Environment parameter to the value one when the first mobile radio subscriber device 801 currently CSI supports what is assumed in this example or sets the value of the Radio Environment parameter to the value zero if the first mobile radio subscriber device 801 CSI not currently supported. The network element is, for example, an MGFC that is related to 1 VCC application server unit described 120 or an IMS application server unit 119 ,

The 200 OK message 814 will also appear in a connect message 815 converted. This conversion can be carried out by the network element, which also determines whether the first mobile radio subscriber device 801 currently CSI supported, and accordingly sets the value of the Radio Environment parameter, or from another network element. According to the determination of whether the first mobile radio subscriber device 801 currently CSI supports (which is assumed as mentioned) rejects the Connect message 815 set the Radio Environment parameter to one.

In 810 becomes the connect message 815 to the second mobile radio subscriber device 802 transmitted.

In 811 shows the second mobile radio subscriber device 802 the user of the second mobile radio subscriber device 802 indicates that the first mobile subscriber device 801 CSI currently supports what the second mobile subscriber device 802 using the Connect message 815 has been signaled.

The message flow for an exemplary embodiment of the invention, in which the value of the radio environment parameter is determined by a network element, for the second application is in 9 shown.

9 shows a message flow diagram 900 according to an embodiment of the invention.

The message flow shown takes place between a first mobile radio subscriber device 901 , a second mobile radio subscriber device 902 and network elements 903 instead, analogous to 4 ,

In 904 requests the first mobile subscriber device 901 by means of an invite message 912 the establishment of a communication link to the second mobile radio subscriber device 902 on. The Invite message 912 contains in contrast to 5 the Radio Environment parameter, or with any value.

Analogous to 809 in 8th determined in 905 a network element of the network elements 903 the value of the Radio Environment parameter. The Invite message 912 is from a network element of the network elements 903 in a setup message 913 converted, which contains the determined value for the Radio Environment parameter.

In 906 becomes the setup message 913 to the second mobile radio subscriber device 902 transmitted. Analogous to the embodiment that is referenced to 8th is described, the conversion of the invite message 912 in the setup message 913 be carried out by the same network element that determines the value of the Radio Environment parameter or by another network element.

In 907 becomes the user of the second mobile radio subscriber device 902 displayed that the first mobile subscriber device 901 currently CSI supports what the second mobile subscriber device 902 using the setup message 913 has been signaled. It is assumed that the user of the second mobile radio subscriber device 902 agrees to the establishment of the communication connection. Accordingly, in 908 a connect message 914 which like the setup message 913 is designed in accordance with the SS7 protocol to the network elements 903 transmitted. The Connect message contains the Radio Environment parameter with the value one, which signals that the second mobile radio subscriber device is currently in use CSI supported.

In 909 becomes the connect message 914 in a 200 OK message 915 that like the Invite message 912 is designed according to the SIP protocol, converted. The 200 OK message 915 assigns the Radio Environment parameter with the value 1 on. The network element that is the connect message 914 in the 200 OK message 915 converted, allows analog 805 the value of the Radio Environment parameter, which indicates whether the second mobile radio subscriber device is currently CSI supported, unchanged. The 200 OK- message 915 is in 910 to the first mobile radio subscriber device 901 transmitted. In 911 becomes the user of the first mobile radio subscriber device 901 displayed that the second mobile subscriber device 902 currently CSI supported.

In the following, the message flow according to an exemplary embodiment of the invention, in which a network element determines whether the first mobile radio subscriber device 301 currently CSI supported or not, explained.

10 shows a message flow diagram 1000 according to an embodiment of the invention.

The message flow shown is analogous to 4 between a first mobile radio subscriber device 1001 , a second mobile radio subscriber device 1002 and network elements 1003 instead of.

In 1004 requests the first mobile subscriber device 1001 the establishment of a packet-switched communication connection to the second mobile radio subscriber device 102 by means of an invite message 1011 on. In contrast to 6 the Invite message does not contain the Radio Environment parameter or contains the Radio Environment parameter, which is set to any value.

Analogous to 809 is in 1005 determines whether the first mobile radio subscriber device 1001 currently CSI supported and the Radio Environment parameter is set accordingly. Since it is assumed that the first mobile radio subscriber device 1001 currently CSI supported, the parameter Radio Environment is set to the value one. The Radio Environment parameter with the value one is in the Invite message 1011 or the Radio Environment parameter is inserted in the Invite message 1011 set to the value one and the invite message 1011 is in 1006 to the second mobile radio subscriber device 1002 forwarded.

In 1007 becomes the user of the second mobile radio subscriber device 1002 displayed that the first mobile subscriber device 1001 current CSI supports what the second mobile subscriber device 1002 by means of the invite message 1011 and the radio environment parameter contained therein and set to the value one has been signaled.

It is assumed that the user of the second mobile radio subscriber device 1002 agrees to the establishment of the packet-switched communication connection. Accordingly, in 1008 a 200 OK message 1012 from the second mobile radio subscriber device 1002 to the network elements 1003 transmitted which of the network elements 1003 in 1009 to the first mobile radio subscriber device 1001 is forwarded. The 200 OK message 1012 contains the Radio Environment parameter set to one, indicating that the second mobile radio subscriber device 1002 currently CSI supported.

In 1010 becomes the user of the first mobile radio subscriber device 1001 displayed that the second mobile subscriber device 1002 current CSI supports what by means of 200 OK message 1012 has been signaled.

The network element that contains the invite message 1011 and the 200 OK message 1012 for example, is one CSCF (Call Session Control Function), which is part of the home network of the first mobile radio subscriber device 1001 is.

A message flow according to an exemplary embodiment is described below, which corresponds to the fourth application and in which a network element determines whether the first mobile radio subscriber device 301 currently supports CSI.

11 shows a message flow diagram 1100 according to an exemplary embodiment of the invention.

Analogous to 4 the message flow shown is found between a first mobile radio subscriber device 1101 , a second mobile radio subscriber device 1102 and network elements 1103 instead of.

In 1104 requests the second mobile radio subscriber device 1102 the establishment of a packet-switched communication connection between the first mobile radio subscriber device 1101 and the second mobile radio subscriber device 1102 by sending an invite message 1111 on. The Invite message 1111 is in 1105 to the first mobile radio subscriber device 1101 forwarded. This is for example from a CSCF carried out. The Invite message 1111 is according to SIP designed and the second mobile radio subscriber device 1102 has in the invite message 1111 inserted the parameter Radio Environment with the value one to indicate that the second mobile radio user device 1102 currently CSI supported.

In 1106 shows the first mobile radio subscriber device 1101 the user of the first mobile radio subscriber device 1101 indicates that the second mobile radio subscriber device 1102 currently CSI as supported by the Radio Environment parameter that is in the Invite message 1111 is included, has been signaled.

In 1107 transmits the first mobile radio subscriber device 1101 a 200 OK message 1112 around indicate that the user of the first cellular subscriber device 1101 agrees that the requested packet-switched communication connection is set up and to indicate that the communication connection should be set up accordingly.

In contrast to the embodiment that with reference to 7 has been explained contains the 200 OK message 1112 not the Radio Environment parameter set to one, but the Radio Environment parameter with any value (or does not contain the Radio Environment parameter at all). Analogous to 809 determines a network element of the network elements 1103 whether the first mobile subscriber device 1101 currently CSI supported. Accordingly, it specifies the Radio Environment parameter (in this case, since it is assumed that the first mobile radio subscriber device 1101 currently CSI supports, to the value one) and sets the parameter Radio Environment in the 200 OK message 1112 to the corresponding value (in this example the value one). In 1109 will the 200 OK message 1112 to the second mobile radio subscriber device 1102 forwarded.

In 1110 shows the second mobile radio subscriber device 1102 the user of the second mobile radio subscriber device 1102 indicates that the first mobile subscriber device 1101 currently CSI supports as it is by means of the 200 OK message 1112 has been signaled.

Below is with reference to 12 describes a message generating device that is provided according to an embodiment of the invention.

12 shows a message generation arrangement 1200 according to an embodiment of the invention.

The message generation arrangement 1200 is part of a communication system 1201 and has a determining device 1206 on, which determines whether a first communication terminal 1202 the communication system by means of packet-switching network elements 1204 of the communication system can participate in a communication link on which a second communication terminal 1203 the communication system by means of circuit-switching network elements 1205 of the communication system participates.

The message generation arrangement also has a message generation device 1207 which, when it has been determined that the first communication terminal 1203 by means of the packet-switching network elements 1204 can participate in a communication link on which the second communication terminal 1202 by means of the circuit-switching network elements 1205 attends a message 1208 that generates the information 1209 has that the first communication terminal supports that between the first communication terminal and the second communication terminal, a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously.

• - eine Ermittlungseinrichtung, die eingerichtet ist, zu ermitteln, ob ein erstes Kommunikationsendgerät des Kommunikationssystems mittels der paketvermittelnden Domäne des Kommunikationssystems an einer Kommunikationsverbindung teilnehmen kann, an der ein zweites Kommunikationsendgerät des Kommunikationssystems mittels der leitungsvermittelnden Domäne des Kommunikationssystems teilnimmt;
• - eine Nachrichtenerzeugungseinrichtung, die eingerichtet ist, wenn ermittelt worden ist, dass das erste Kommunikationsendgerat mittels der paketvermittelnden Domäne an einer Kommunikationsverbindung teilnehmen kann, an der das zweite Kommunikationsendgerat mittels der leitungsvermittelnden Domäne teilnimmt, eine Nachricht zu erzeugen, die die Information aufweist, dass es das erste Kommunikationsendgerät unterstützt, dass zwischen dem ersten Kommunikationsendgerät und dem zweiten Kommunikationsendgerät gleichzeitig eine paketvermittelte Kommunikationsverbindung und eine leitungsvermittelte Kommunikationsverbindung bestehen kann.

According to a further exemplary embodiment of the invention, a message generation arrangement of a communication system is provided, which comprises:

• a determination device which is set up to determine whether a first communication terminal of the communication system can participate in a communication connection by means of the packet-switching domain of the communication system, in which a second communication terminal of the communication system participates by means of the circuit-switching domain of the communication system;
• a message generating device, which is set up when it has been determined that the first communication terminal can use the packet-switching domain to participate in a communication link in which the second communication terminal participates by means of the circuit-switching domain to generate a message which has the information that it the first communication terminal supports that a packet-switched communication connection and a circuit-switched communication connection can exist between the first communication terminal and the second communication terminal at the same time.

• - eine Ermittlungseinrichtung, die eingerichtet ist, zu ermitteln, ob das Kommunikationsendgerät des Kommunikationssystems mittels paketvermittelnder Netzwerkelemente des Kommunikationssystems an einer Kommunikationsverbindung teilnehmen kann, an der ein weiteres Kommunikationsendgerat des Kommunikationssystems mittels leitungsvermittelnder Netzwerkelemente des Kommunikationssystems teilnimmt;
• - eine Nachrichtenerzeugungseinrichtung, die eingerichtet ist, wenn ermittelt worden ist, dass das Kommunikationsendgerät mittels der paketvermittelnden Netzwerkelemente an einer Kommunikationsverbindung teilnehmen kann, an der das weitere Kommunikationsendgerät mittels der leitungsvermittelnden Netzwerkelemente teilnimmt, eine Nachricht zu erzeugen, die die Information aufweist, dass es das Kommunikationsendgerat unterstutzt, dass zwischen dem Kommunikationsendgerat und dem weiteren Kommunikationsendgerät gleichzeitig eine paketvermittelte Kommunikationsverbindung und eine leitungsvermittelte Kommunikationsverbindung bestehen kann.

According to a further exemplary embodiment of the invention, a communication terminal of a communication system is provided, which has:

• a determination device which is set up to determine whether the communication terminal of the communication system can participate in a communication connection by means of packet-switching network elements of the communication system, in which a further communication terminal of the communication system participates by means of circuit-switching network elements of the communication system;
• a message generating device which is set up when it has been determined that the communication terminal can use the packet-switching network elements to participate in a communication connection in which the further communication terminal participates by means of the circuit-switching network elements to generate a message which has the information that it supports the communication terminal, that a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously between the communication terminal and the further communication terminal.

• - eine Ermittlungseinrichtung, die eingerichtet ist, zu ermitteln, ob ein erstes Kommunikationsendgerät des Kommunikationssystems mittels paketvermittelnder Netzwerkelemente des Kommunikationssystems an einer Kommunikationsverbindung teilnehmen kann, an der ein zweites Kommunikationsendgerät des Kommunikationssystems mittels leitungsvermittelnder Netzwerkelemente des Kommunikationssystems teilnimmt;
• - eine Nachrichtenerzeugungseinrichtung, die eingerichtet ist, wenn ermittelt worden ist, dass das erste Kommunikationsendgerät mittels der paketvermittelnden Netzwerkelemente an einer Kommunikationsverbindung teilnehmen kann, an der das zweite Kommunikationsendgerät mittels der leitungsvermittelnden Netzwerkelemente teilnimmt, eine Nachricht zu erzeugen, die die Information aufweist, dass es das erste Kommunikationsendgerät unterstützt, dass zwischen dem ersten Kommunikationsendgerät und dem zweiten Kommunikationsendgerät gleichzeitig eine paketvermittelte Kommunikationsverbindung und eine leitungsvermittelte Kommunikationsverbindung bestehen kann.

According to a further exemplary embodiment of the invention, a server unit of a communication system is provided, which has:

• a determination device that is set up to determine whether a first communication terminal of the communication system can participate in a communication connection by means of packet-switching network elements of the communication system, in which a second communication terminal of the communication system participates by means of circuit-switching network elements of the communication system;
• a message generating device, which is set up when it has been determined that the first communication terminal can use the packet-switching network elements to participate in a communication link in which the second communication terminal participates using the circuit-switching network elements to generate a message that has the information that it the first communication terminal supports that a packet-switched communication connection and a circuit-switched communication connection can exist between the first communication terminal and the second communication terminal at the same time.

LIST OF REFERENCE NUMBERS

100

The mobile radio communication system

101,102

Mobile Subscriber Equipment

103

Mobile radio communication network

104.105

CS client units

106

CS core network

107-110

arrows

111,112

IMS client units

113

PS core network

114

IMS core network

115

Radio access network

116-118

arrows

119

Application server units

120

VCC application server unit

200

flow chart

201-206

process steps

300

The mobile radio communication system

301

first mobile radio subscriber device

302

second mobile radio subscriber device

303

Network elements

304

first CS client unit

305

second CS client unit

306

black cross

307

first IMS client unit

308

second IMS client unit

309

first arrow

310

second arrow

311

third arrow

312

fourth arrow

400

Message flow diagram

401

first mobile subscriber device

402

second mobile subscriber device

403

Network elements

404-412

process steps

413-416

news

500

Message flow diagram

501

first mobile radio subscriber device

502

second mobile radio subscriber device

503

Network elements

504-512

process steps

513-516

news

600

Message flow diagram

601

first mobile radio subscriber device

602

second mobile radio subscriber device

603

Network elements

604-610

process steps

611.612

news

700

Message flow diagram

701

first mobile radio subscriber device

702

second mobile radio subscriber device

703

Network elements

704-710

process steps

711.712

news

800

Message flow diagram

801

first mobile radio subscriber device

802

second mobile radio subscriber device

803

Network elements

804-811

process steps

812-815

news

900

Message flow diagram

901

first mobile subscriber device

902

second mobile radio subscriber device

903

Network elements

904-911

process steps

912-915

news

1000

Message flow diagram

1001

first mobile radio subscriber device

1002

second mobile radio subscriber device

1003

Network elements

1004-1010

process steps

1011.1012

news

1100

Message flow diagram

1101

first mobile radio subscriber device

1102

second mobile radio subscriber device

1103

Network elements

1104-1110

process steps

1111.1112

news

1200

Message generating arrangement

1201

communication system

1202.1203

communication terminals

1204

packet-switching network elements

1205

circuit-switching network elements

1206

determining device

1207

News generator

1208

message

1209

information

Claims (10)

Message generation arrangement of a communication system, comprising: - A determination device which is set up to determine whether "Voice Call Continuity Between Circuit Switched (CS) and Internet Protocol Multimedia Subsystem (IMS)" (VCC) is supported for a first communication terminal of the communication system, so that the first communication terminal by means of packet-switching Network elements of the communication system can participate in a voice communication connection in which a second communication terminal of the communication system participates by means of circuit-switching network elements of the communication system; a message generating device, which is set up when it has been determined that VCC is supported for the first communication terminal, to generate a message which has the information that the first communication terminal supports "Combining CS calls and IMS sessions" (CSI) that a packet-switched communication connection and a circuit-switched communication connection can exist simultaneously between the first communication terminal and the second communication terminal. Message generation arrangement according to Claim 1 , wherein the message generation arrangement is arranged in the first communication terminal. Message generation arrangement according to Claim 1 or 2 , wherein the communication system has a communication network and a signaling device is a unit of the communication network. Message generation arrangement according to Claim 3 , wherein the message generating device is set up to generate the message as part of a protocol conversion from a signaling protocol used by the packet-switching network elements to a signaling protocol used by the circuit-switching network elements is used to perform. Message generation arrangement according to Claim 4 , the signaling protocol used by the packet switching network elements being SIP. Message generation arrangement according to Claim 5 , the signaling protocol used by the circuit switching network elements being SS7. Message generation arrangement according to one of the Claims 3 to 6 , wherein the communication network is a mobile radio communication network. Message generation arrangement according to one of the Claims 1 to 7 , wherein the first communication terminal is a mobile radio subscriber device. Message generation arrangement according to one of the Claims 1 to 8th , wherein the message generating device is set up to generate the message when the first communication terminal is registered with a network element of the communication system for the use of packet-switched communication connections. A method of generating a message in which: - It is determined whether "Voice Call Continuity Between Circuit Switched (CS) and Internet Protocol Multimedia Subsystem (IMS)" (VCC) is supported for a first communication terminal of a communication system, so that the first communication terminal uses packet-switching network elements of the communication system on a voice Can participate communication link in which a second communication terminal of the communication system participates by means of circuit-switching network elements of the communication system; - If it has been determined that VCC is supported for the first communication terminal, a message is generated which has the information that the first communication terminal supports "Combining CS calls and IMS sessions" (CSI), so that between the first communication terminal and the second communication terminal can simultaneously exist a packet-switched communication connection and a circuit-switched communication connection.

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