DE102005010038B4 - A method of providing multiple group communication services, group communication service system and group communication service server unit - Google Patents

Abstract

A method of providing multiple group communication services with the same subscribers
Wherein a first group communication service session of a first group communication service is provided, wherein the first group communication service session is identified with a group communication service session identification information identifying a set group communication service session which is determinable, which participants participate in the first group communication service session, and
Wherein a second group communication service session of a second group communication service is provided, wherein the second group communication service is a different group communication service than the first group communication service, and wherein the participants of the second group communication service session and / or the second group communication service session is identified with the same group communication service session identification with which the first group communication service session is also identified
In which, in the event of a change in the subscribers of the first group communication service session using a notification service, the subscribers of the second group communication service session are updated.

Description

The The invention relates to a method for providing a plurality of group communication services, a group communication service system and a group communication service server unit.

It For example, different group communication services are known the group communication service "Push to Talk over Cellular" (PoC) or the group communication service of the Instant messaging (IM). If desired For example, both group communication services will be the same Subscribers, i. to operate with the same group of users, so the problem arises that the group communication services from a technical point of view, should function independently of each other (i.e. the push-to-talk over cellular group communication service should also be without the instant messaging group communication service work and vice versa), but from the user's perspective, it is expected that both group communication services with the same group can be operated in parallel by users.

Around to the group communication service Push-to-Talk over Cellular Building a group communication service session between two different ones PoC users, also referred to below as PoC users (or their PoC client units) Signaling becomes common used the Session Initiation Protocol (SIP) as described in [1] is.

One first PoC user who has a PoC group communication service session with a or multiple PoC users want to build sends a SIP INVITE message to a PoC server unit. In the SIP INVITE message all become the PoC group communication service session inviting PoC users using identification information (IDs) (For example, SIP URIs (Session Initiation Protocol-Unique Resource Identifier)). These identification details can, for example immediately PoC users identify (user IDs) or even a group of PoC users (group IDs). In the case of using a group ID, it is necessary that the PoC server unit using a group management server unit (GM-server unit) hereinafter also referred to as a group management server unit, the Dissolve group, i.e. the user IDs for all PoC users belonging to the respective group determine.

Lie the PoC server unit then all PoC users to be invited by means of a User ID before, so loads the PoC server unit all these PoC users with the help of a respective SIP INVITE message to the PoC group communication service (PoC) session.

If the invited users accept the invitation, so send it a SIP 200 OK message back to the PoC server unit. Of the Inviting PoC users turn (usually only once) with a SIP 200 OK message over notified the successful establishment of the PoC session.

The procedure of the method described above is for clarity in a message flow diagram 200 in 2 shown. A first PoC client unit 201 implemented in a first mobile communication terminal (not shown) transmits a first SIP INVITE message 202 to a controlling PoC server unit 203 with which message the generation of a PoC group communication service session is requested. As a parameter in the first SIP INVITE message 202 is the group identification information (group ID) indicating the participants of the group to be invited to the PoC group communication service session to be formed. In 2 this group parameter is named sip: group1@abc.de.

Upon receipt of the first SIP INVITE message 202 The controlling PoC server unit determines 203 using the specified parameter value, that with the first SIP INVITE message 202 requesting that a group communications service session be established, and notes that it must resolve a group of participants (as a group ID as a parameter in the first SIP INVITE message 202 contained), ie that he is the one to the in the first SIP INVITE message 202 specified participant (step 204 ).

To determine the participants belonging to the group, the controlling PoC server unit generates 203 a SIP group resolution request message 205 (Group Resolve Request) with the group identification as a parameter to a Group Management Server unit 206 ,

In the Group Management Server unit 206 For the registered groups, the respective subscribers belonging to the group and their identification data (user IDs) are stored. Upon receiving the SIP group resolution request message 205 The Group Management Server unit determines 206 the subscribers belonging to the group and their user IDs and generates and sends a SIP group resolution response message 207 (Group Resolve Response) to the controlling PoC server unit 203 where in the SIP group resolution response message 207 the groove zer-identification information (user IDs) of the participants associated with the requested group are included (in 2 with reference number 208 (sip: userB@xy.de) and 209 (sip: userC@xy.de)).

After the controlling PoC server unit 203 the SIP group resolution reply message 207 and thus the user IDs associated with the group of interest has been obtained, the controlling PoC server unit generates 203 For each user ID a respective SIP INVITE message and sends it to the respective specified by the respective user ID PoC client unit to the respective PoC client unit and thus the respective PoC user to be established PoC Group Communication Service Session.

In 2 this process is illustrated by means of a second SIP INVITE message 210 which is sent to a second PoC client unit 210 is transmitted to the user, ie the subscriber of a second mobile radio communication terminal, in which the second PoC client unit 211 is implemented to invite to the PoC group communication service session. There will also be a third SIP INVITE message 212 from the controlling PoC server unit 203 generated and sent to the third PoC client unit 213 transmitted in a third mobile communication terminal of a third party, which is identified by the second user ID 209 to also invite this participant to the PoC group communication service session.

Upon receipt of the second SIP INVITE message 210 The second PoC client unit generates 211 in the event that she wishes to participate in the PoC Group Communication Service session, a first SIP 200 OK message 214 and sends them to the controlling PoC server unit 203 ,

The third PoC client unit 213 creates a second SIP 200 OK message in case it also wants to join the PoC Group Communication Service session 215 and also transmits them to the controlling PoC server unit 203 ,

If the controlling PoC server unit 203 has received all the SIP 200 OK messages, alternatively after a predetermined period of time, sends the controlling PoC server unit 203 (Alternatively, in the event that the first SIP 200 OK message 214 received) a third SIP 200 OK message 216 and sends it to the first PoC client unit 201 ,

This is the PoC group communication service session 217 In other words, the PoC group communication service session runs with the participants first PoC client unit 201 , second PoC client unit 211 and third PoC client unit 213 ,

in the The following is based on the endeavor, that when built up PoC group communication service session one or more additional Group communication service sessions other than the PoC group communication service different Group communication services with the same users, i. with the same Group, built and used. In other words, means this is that the same user group has several different session-based group communication services parallel, i. at the same time, would like to use.

The user group (user group) would thus like to use, for example, an instant messaging group communication service session (IM session) in parallel during the PoC group communication service session (PoC session). In this case, for example, the first PoC user, ie the first PoC client unit 201 according to the prior art according to a similar method, as in 2 is illustrated, an instant messaging group communication service (IM group communication service session) with the same users build.

in the Following will be both a PoC user and an IM user only still referred to as users, as users have multiple group communication services use in parallel.

Will that be in 2 In particular, the method described in connection with the establishment of a PoC group communication service session for setting up an IM group communication service session with the same subscribers has the following disadvantage.

The Group of users at a given time at a PoC group communication service session participate does not have to match the group of users the original have been invited to the PoC Group Communication Service session.

• • ein Nutzer, der eingeladen wurde, die Einladung nicht akzeptiert und somit nicht Teilnehmer der PoC-Gruppen-Kommunikationsdienst-Sitzung ist;
• • ein Nutzer, der die Einladung akzeptiert hat, zu einem späteren Zeitpunkt irgendwann die PoC-Gruppen-Kommunikationsdienst-Sitzung verlässt;
• • ein ursprünglich nicht eingeladener Nutzer während der PoC-Gruppen-Kommunikationsdienst-Sitzung hinzugenommen (eingeladen) wird;
• • ein ursprünglich nicht eingeladener Nutzer sich während der laufenden PoC-Gruppen-Kommunikationsdienst-Sitzung selbst einwählt.

This is evident since it is possible that

• • a user who has been invited, does not accept the invitation and thus is not a participant in the PoC Group Communication Service session;
• • a user who has accepted the invitation will eventually leave the PoC Group Communications Service session at a later date;
• • an initially uninvited user during PoC group communication service session is added (invited);
• • An initially uninvited user dials in during the ongoing PoC Group Communication Service session.

The disadvantages described above could according to the state The technique is bypassed by a user interacting with an in [2] described at the PoC server unit to the PoC group communication service session to the so-called Session State Notification Service, as in [3], logs. This means he is always informed which PoC users currently participate in the PoC group communication service session take part.

With this knowledge, who is currently participating in the PoC Group Communication Service session, could then a user (or its instant messaging client unit) with these users have an IM group communication service session build up.

But This procedure also has disadvantages, as soon as, for example a user in one of the group communication service sessions this is also required in the other group communication service sessions be invited. This means that at least one user (or its client unit) to the session state notification services Both group communication service sessions must log in to match the two participant groups to check and if necessary produce. This in itself is a disadvantage, since the session state notification services are just an optional feature. In addition, this procedure generates in certain circumstances an enormous signaling effort over the mobile radio interface (Air interface) and thus additional costs for the individual Users.

In Reference [8] describes a communication system in which a User group in the form of a group object. For the user group can various communication services are provided. Especially can Group Communication Service sessions with the same participants be provided from the user group.

pamphlet [9] discloses a method in which a second conference consists of a Conference is started out, so for example by means of a additional Media type can be communicated. This will be an additional Conference bridge for the new one Media type set up.

In [10] describes a communication system in which in one Application server a push-to-talk group is created. When a Content server sends a push to talk message for the push to talk group is determined, this will provide to the members of the push-to-talk group distributed.

pamphlet [11] discloses a visual representation of a group using it A web interface allows for different Communication services with members of the group as participants to start.

Of the Invention is based on the problem, a simpler administration two group communication sessions with the same participants provide.

The Problem is solved by a method for providing multiple group communication services, through a group communication service system and by a group communication service server unit solved with the features according to the independent claims.

at a method of providing multiple group communication services with the same participants will be a first group communication service session provided a first group communication service, wherein the first group communication service session with a group communication session identification information which identifies an established group communication service session, is identified from which can be determined, which participants participate in the first group communication service session. Further becomes a second group communication service session a second group communication service provided, wherein the second group communication service a other group communication service is considered the first group communication service. The participants of the second group communication service session and / or the second group communication service session will / will be with the same group communication service session identification identifies with which also the first group communication service session is identified and in the event of a change at the participants of the first group communication service session become subscribers using a notification service the second group communication service session updated.

A group communication service system comprises a first group communication service server unit for providing a first group communication service arranged to provide a first group communication service session provided with a first group communication service Group Communication Service Session Identification identifying a set Group Communication Service session identifying from which to determine which participants are participating in the first Group Communication Service session. Further, the group communication service system includes a second group communication service server unit for providing a second group communication service, the second group communication service being a different group communication service than the first group communication service. The second group communication service server unit is arranged to identify subscribers of a second group communication service session provided and / or one provided second group communication service session with the same group communication service session identification with which the group communication service server identification unit also identifies first group communication service session is identified. Further, the group communication service system has an updating unit configured to update the users of the second group communication service session upon a change in the subscribers of the first group communication service session using a notification service.

By the use of an identification for both identification the first group communication service session as well as the second Group communication service session is very simple allows that changes the subscriber is registered directly in both group communication service sessions and taken into account can be. Furthermore is guaranteed that, compared with a static, fixed predetermined group identification of group participants not all participants specified in the group to the "second Group communication service session " but only those who actually already participate in the first group communication service session.

In order to is automatically without additional signaling overhead, for example about the mobile interface, ensures that the participants of the educated group communication service sessions are identical.

On this way is a simple realization given a group communication service system, in which two or more concurrent but technically mutually exclusive independent group communication service sessions always the same, in both group communication service sessions participating, users have to be provided.

preferred Embodiments of the invention will become apparent from the dependent claims.

The hereinafter described embodiments of the invention apply as well as the procedure as well the group communication service system.

According to one Embodiment of the invention, it is provided that at least one the group communication services as a mobile group communication service is used, in other words this means that at least one of the group communication service server units as a mobile group communication service server unit is set up. In other words This means, for example, that a PoC server assumes the role of a group management server.

The Invention is very good for the use in the mobile sector, as the mobile use of group communication services steady growth is recorded.

• • Push-to-Talk-over-Cellular-Gruppen-Kommunikationsdienst;
• • Konferenz-Gruppen-Kommunikationsdienst (z.B. „IMS-Conferencing");
• • Gruppen-Spieldienst („Multi-User-Games");
• • Instant-Messaging-Gruppen-Kommunikationsdienst;
• • ein, beispielsweise über ein Mobilfunk-Kommunikationsnetz vorgesehener Austausch von Dateien zwischen den Teilnehmern einer Gruppe;
• • eine verteilte Datei-Bearbeitung einer oder mehrerer Dateien von Teilnehmern einer Gruppe (auch als „Whiteboard" bezeichnet).

At least one of the following group communication services may be used as the first group communication service and / or as the second group communication service:

• • push-to-talk-over-cellular group communication service;
• • conference group communication service (eg "IMS conferencing");
• • group game service ("multi-user games");
• • instant messaging group communication service;
• An exchange of files between participants of a group, for example via a mobile communications network;
• • Distributed file editing of one or more files of participants in a group (also known as a "whiteboard").

Different expressed this means that at least one of the group communication service server units is arranged to provide at least one of the above described group communication services.

Under Instant Messaging (IM) is a group communication service that understands it allows, by means of a client program (an IM client unit), also referred to as "instant Messenger ", in real time to chat, short electronic messages (called push method) to others Participants over to send a communication network (mostly the internet / intranet) or to exchange electronic files.

The group communication service sit tion identification can be performed by a central group management server unit for managing the at least one group communication service session identification information, the group management server unit being connected to the first group communication service server unit and / or or the second group communication service server unit, or it may be stored in and exchanged between the respective group communication service server units respectively providing the group communication service.

clear this is equivalent to a centralized (if a group management server unit is provided) or a remote (if the group communication service session identification stored only in the group communication service server units) storage and Management of group communication service session identification information and thus the control of the interaction of the technically in itself independent of one another Group Communication Service sessions regarding the update and the users participating in the respective group communication service session or regarding the warranty, that in both, generally in all, group communication service sessions same users participate.

According to one Another embodiment of the invention, it is provided that, after the first group communication service session has been set up by a subscriber terminal to provide the second Group communication service session requesting that using the Group Communication Service Session Identification It determines which participants in the first group communication service session participate and that the identified participants to the second group communication service session be invited. In other words, this means, for example, that the user is using, for example, the session ID the first session used at the second server.

The first group communication service session may be from a first Group communication service server unit. Furthermore, it may be provided that, after the first group communication service session has been set up by a subscriber terminal to provide the second Group communication service session at a second group communication service session requesting second group communication service server unit requested is, with the group communication service session identification information the second group communication service server unit transmits becomes.

clear This approach corresponds to a first decentralized alternative the realization of the distributed provision of the group communication service session identification both in the first group communication service server unit as well as in the second group communication service server unit, the subscriber terminal generating the second group communication service session immediately at the second group communication service server unit which then requests, for example, those in the group intended participants determined by the first group communication service server unit.

According to one Another embodiment of the invention, it is provided that the first group communication service session provided by a first group communication service server unit and that, after the first group communication service session has been set up by a subscriber terminal to provide the second Group Communication Service session at the first group communication service server unit is requested and that of the first group communication service server unit providing the second group communication service session at a second group communication service session providing second group communication service server unit, wherein the group communication service session identification information transmitted to the second group communication service server unit becomes. In other words This means, for example, that the user at the first server the second service requested.

clear this approach means that the setup of the second group communication service session from the subscriber terminal immediately at the second group communication service server unit but at the first group communication service server unit, which in turn using the group communication service session identification the establishment of the second group communication service session the second group communication service server unit requested.

The determination of which subscribers participate in the first group communication service session using the identification information may be made by the second group communication service server unit at the first group communication service server unit requesting, using the group communication service session identification information, which participants participate in the first group communication service session.

The participating in the first group communication service session Subscribers in this case are from the first group communication service server unit transmitted to the second group communication service server unit.

According to this Embodiment of the invention, it can be provided that the determination, which participants in the first group communication service session take place using a notification service.

According to one Another embodiment of the invention, it is provided that the first group communication service session provided by a first group communication service server unit and that the group communication service session identification from the first group communication service server unit to one Group Management Server Unit that manages subscriber groups. The second group communication service session is generated by a second group communication service session providing the second group communication service server unit the users to be invited using the group communication service session identification, which is communicated to him when applying for the second session, from the group management server unit is determined.

According to one Yet another embodiment of the invention, it is provided that the first group communication service session provided by a first group communication service server unit and that the group communication service session identification from a participant in the first group communication service session User terminal to a group management server unit, which participant groups are managed, transferred. The second Group communication service session is generated by one providing the second group communication service session second group communication service server unit the group communication service session identification is determined by the group management server unit.

The both last described embodiments of the invention vividly correspond to a central administration of the identification data, the group communication service server units the belonging to an identification user for generating the second or any additional additional group communication service session yourself from the group management server unit determined.

The second group communication service session can be to an identification belonging User from the group management server unit determine using a notification service.

• • In diesem Fall nutzen Nutzer (User) Gruppen-Kommunikationsdienst-Sitzungs-Identifikationsangaben, um neue Gruppen-Kommunikationsdienste und somit neue Gruppen-Kommunikationsdienst-Sitzungen mit denselben Teilnehmern zu starten.
• • Der neue Gruppen-Kommunikationsdienst ermittelt unter Verwendung der Gruppen-Kommunikationsdienst-Sitzungs-Identifikationsangabe bei dem für den neuen Gruppen-Kommunikationsdienst zuständigen, d.h. diesem zugehörigen Server, die momentane, d.h. in der schon laufenden Gruppen-Kommunikationsdienst-Sitzung vorhandenen und genutzten Teilnehmer-Liste.
• • Die Gruppen-Kommunikationsdienste melden sich jeweils gegenseitig zu der Änderungs-Notifizierung (Change-Notifizierung) an, um die jeweiligen Teilnehmer-Listen synchron zu halten.

One aspect of the invention can thus be seen in the fact that subscriber lists are synchronized between different services, ie between different group communication services, in a decentralized manner (decentralized synchronization of the subscriber lists between different services).

• In this case, users (users) use group communication service session identification information to start new group communication services and thus new group communication service sessions with the same participants.
• The new group communication service determines, using the group communication service session identification information in the server responsible for the new group communication service, ie the server associated therewith, the current subscriber, ie those already present and used in the already running group communication service session. List.
• • The group communication services log each other on to the change notification (change notification) in order to keep the respective subscriber lists in sync.

• • In diesem Fall wird die Teilnehmer-Liste, welche eine temporäre Teilnehmer-Liste ist, zentral, beispielsweise bei einem Group-Management-Server, allgemein bei einer Gruppen-Verwaltungs-Server-Einheit, angelegt. Das Anlegen kann erfolgen
• – obligatorisch/automatisch;
• – ausgelöst, d.h. getriggert durch den ersten Server, d.h. durch die erste Gruppen-Kommunikationsdienst-Server-Einheit; oder
• – ausgelöst, d.h. getriggert durch einen Nutzer.
• • Nutzer nutzen temporäre Gruppen-Identifikationsangaben (Gruppen-IDs), um neue Gruppen-Kommunikationsdienste bzw. neue Gruppen-Kommunikationsdienstsitzungen mit denselben Teilnehmern zu starten.
• • Der neue Gruppen-Kommunikationsdienst ermittelt unter Verwendung der temporären Gruppen-ID bei der Gruppen-Verwaltungs-Server-Einheit, die momentane, d.h. aktuelle Teilnehmer-Liste.
• • Die Gruppen-Kommunikationsdienste melden sich bei der Gruppen-Verwaltungs-Server-Einheit und die Gruppen-Verwaltungs-Server-Einheit meldet sich bei den Gruppen-Kommunikationsdiensten zur Änderungs-Notifizierung (Change-Notifizierung) an, um die jeweiligen Teilnehmer-Listen synchron zu halten.

Another aspect of the invention can be seen in that the subscriber lists are centrally synchronized between different services, ie different group communication services (central synchronization of the subscriber lists between different services).

• In this case, the subscriber list, which is a temporary subscriber list, is centrally created, for example, at a group management server, generally at a group management server unit. The creation can take place
• - obligatory / automatic;
• Triggered, ie triggered by the first server, ie by the first group communication service server unit; or
• - triggered, ie triggered by a user.
• • Users use temporary group identification information (group IDs) to start new group communication services or new group communication service sessions with the same participants.
• • The new group communication service averages the current, ie current, subscriber list using the temporary group ID at the group management server unit.
• • The group communication services log into the group management server unit and the group management server unit logs in to the group communication services for change notification to synchronize the respective subscriber lists to keep.

embodiments The invention are illustrated in the figures and will be explained in more detail below. In the figures are the same elements, the same process steps or Messages if appropriate with provided identical reference numerals.

It demonstrate:

1 a block diagram showing the structure of a PoC group communication service session is shown;

2 a message flow diagram illustrating the construction of a PoC group communication service session according to the prior art;

3 a message flow diagram showing the construction of an additional group communication service session according to a first embodiment of the invention;

4 a message flow diagram illustrating the construction of an additional group communication service session according to a second embodiment of the invention;

5 a message flow diagram showing the construction of an additional group communication service session according to a third embodiment of the invention;

6 a message flow diagram in which the structure of an additional group communication service session according to a fourth embodiment of the invention is shown.

Push-to-Talk-over-Cellular (PoC) is a service according to which it a user or transmitter allows is a voice message to one or simultaneously to several Receiver over one To transmit mobile radio interface. As part of a PoC communication, the voice data usually already during the pronunciation of the one to be transmitted Speech signal through the user in the mobile terminal via the Mobile radio communication network distributed, i. to the one or the desired Receiver transmitted. Illustratively, a PoC communication corresponds to the user's view usual in itself CB radio, however with the extension that the transmitter world-wide receiver, which using the appropriate switching techniques with at least one Mobile communication network can be reached, can address.

The server units and client units described below and the Mobile communication terminals are for communication according to the UMTS standard set up, alternatively to the communication according to the GSM standard, the GPRS standard or another mobile communication standard, for example according to one 3GPP mobile radio communication standard.

1 shows in a block diagram 100 a controlling PoC server unit 101 as a PoC group communication service server unit and three with the controlling PoC server unit 101 by means of a respective mobile radio communication connection 102 . 103 . 104 coupled PoC client units, namely a first PoC client unit 105 , a second PoC client unit 106 and a third PoC client unit 107 , The PoC client units 105 . 106 . 107 are in a respective mobile communication terminal 111 . 112 . 113 implemented, wherein each mobile communication terminal 111 . 112 . 113 additionally in each case also has a client unit, which is set up for communication in accordance with an additional other group communication service; For example, each mobile communication terminal 111 . 112 . 113 In addition, an instant messaging client unit 108 . 109 . 110 on.

According to the following described embodiments is in a first phase in the same manner as for example according to the prior art, as in connection with 2 described above, a PoC group communication service session, ie, a PoC session 217 from the first PoC client unit 105 with the users of the second PoC client unit 106 or the third PoC client unit 107 established.

This PoC session 217 is assigned a unique PoC group communication service session identification information (session ID), for example the session ID "PoC_SID_82513261277@PoC-Server17.t-Mobile.de", which is both the controlling PoC server unit 101 as well as the three PoC client units 105 . 106 . 107 in other words, both in the controlling PoC server unit 101 as well as in the mobile devices 111 . 112 . 113 are stored. Further, the controlling PoC server unit 101 known, ie she has the corresponding information stored, which users (users) participants of the established and currently running PoC session 217 are.

Is the PoC session 217 as stated in the description of 2 has been described, according to the following embodiments of the invention of the group communication service session participants (session participants) is desired, in parallel and in addition to the PoC group communication service also the group communication service instant messaging (hereinafter also referred to as Instant Messaging group communication service, IM group communication service). This is intended in the following different embodiments without limitation of the generality by the user of the first PoC client unit 105 be triggered.

As in a message flow diagram 300 in 3 is shown, according to a first embodiment of the invention in running, that is active PoC group communication service session 217 between the three PoC client units 105 . 106 . 107 and thus the three mobile devices 111 . 112 . 113 according to the first embodiment of the invention, which clearly provides a decentralized synchronization of the subscriber lists, the following method is performed.

The first mobile terminal 111 (first user equipment (UE) 111 ) (or its IM client unit, ie the first IM client unit 108 ) sends a first SIP INVITE message 301 to an instant messaging server unit 302 (also referred to as instant messaging group communication service server unit or as IM server unit). In the first SIP INVITE message is the session ID 303 the established PoC session as a parameter, according to this embodiment of the invention, the session ID 303 "Sip: poc_session_id@poc.abc.de".

Thus, as would be required, for example, in the prior art, user identification information or group identification information is not included in the first SIP INVITE message 301 and brought to the IM server unit 303 but the to the previously established PoC group communication service session 217 associated session identification 303 (Session ID), as related to 2 was explained and also in 1 is shown, the first PoC client unit 105 and thus the first mobile terminal 111 is known.

Optionally, it is provided that an additional parameter in the first SIP INVITE message 301 to the IM server unit 302 with, namely a parameter indicating that the ID is a session ID and the associated group communication service is a PoC group communication service.

The IM server unit 302 recognizes that the IM users to be invited (IM users) by one in the first SIP INVITE message 301 contained session ID 303 in other words, the IM server unit 302 notes that this is a session ID 303 act (step 304 ) and then inquires at the controlling PoC server unit 101 can be uniquely addressed using the session ID, which users are currently involved in the identified by means of the session ID PoC session.

This takes place according to this embodiment of the invention by the IM server unit the Session State Notification Service, as described in [3] uses.

The IM server unit generates this for this purpose 302 a first SIP SUBSCRIBE message 305 and transmits them to the controlling PoC server unit 101 , In the first SIP SUBSCRIBE message 305 are the parameters as parameters
"Conference State Event Package" as well
"Usage: parallel_session" included.

The first SIP SUBSCRIBE message 305 Optionally, therefore, may include a parameter indicating that a group communication service session should be started in parallel with the same users, for example formulated using the parameter usage: parallel_session.

Once the controlling PoC server unit 101 the first SIP SUBSCRIBE message 305 received, it determines the respective group communication session, which with the session ID 303 is identified, associated subscriber and generates a first SIP NOTIFY message 305 in which the SIP URIs 307 . 308 . 309 the users participating in the PoC Communication Service session are included. In other words, the controlling PoC server unit transmits 101 in the first SIP NOTIFY message 306 the subscriber list of the participants of the PoC group communication service session 217 according to this embodiment of the invention by means of the following exemplary SIP URIs: sip: userA@xy.de 307 ; sip: userB@xy.de 308 ; sip: userC@xy.de 309 ,

Once the IM server unit 302 first SIP NOTIFY message 306 and thus the list of the current participants of the PoC group communication service session 217 received forms the IM server unit 302 for each additional participant (ie for each participant except the first participant who initiated the IM group communication service session or its first IM client entity 108 ) an additional SIP INVITE message to invite the other subscribers to the IM group communication service session.

This means that the IM server unit 302 a second SIP INVITE message 310 generated and this to the second mobile station 112 and to the second IM client unit 109 transmitted.

It also generates the IM server unit 302 a third SIP INVITE message 311 and transmits them to the second mobile station 113 and to the second IM client unit 110 ,

The two mobile devices 112 . 113 , in particular the associated IM client units 109 . 110 , in the case of accepting the invitation to the IM group communication service session, respectively generate a SIP 200 OK message (according to this embodiment of the invention, the second IM client unit generates 109 thus a first SIP 200 OK message 312 and sends it to the IM server unit 302 ; the third IM client unit 110 generates a second SIP 200 OK message 313 and sends it to the IM server unit 302 ).

As indicated above, the first user, ie the first mobile radio communication terminal 111 not invited to the IM group communication service session, since he has the request to the IM server unit 302 has started. Instead, the IM server unit spawns 302 on receipt of either or both SIP-200 OK messages 312 . 313 a third SIP 200 OK message 314 and sends them to the first mobile station 111 and the first IM client unit 108 confirming that the requested IM group communication service session was generated as an acknowledgment to the first SIP INVITE message 301 ,

In addition, the Controlling PoC server unit reports 101 nor the session state notification service, which is the IM server unit 302 is provided by means of a second SIP SUBSCRIBE message 315 which contains the parameter "Conference State Event Package" to which of the controlling PoC server unit 101 is generated and sent to the IM server unit 302 is transmitted. This leads the controlling PoC server unit 101 due to the "usage: parallel_session" parameter specified in the first SIP SUBSCRIBE message 305 from the IM server unit 302 was obtained.

This means that both group communication service server units, ie the controlling PoC server unit 101 and the IM server unit 302 each at the other group communication service server unit 101 . 302 have subscribed to each provided by this Session State Notification service.

Now the two group communication service sessions run technically independently with the same participants, in 3 symbolized by block 316 ,

Now comes, for example, a new subscriber, according to this embodiment of the invention, a fourth subscriber (User D), ie a fourth mobile station 317 with a fourth PoC client unit 318 and a fourth IM client unit 319 to the PoC group communication service session 217 For example, it is, for example, one or more other participants of the PoC group communication service session 217 he invites or chooses himself what, for example, in 3 is represented by one of the fourth PoC client unit 318 generated and sent to the controlling PoC server unit 101 transmitted fourth SIP INVITE message 320 is shown, wherein the application from the controlling PoC server unit 101 by means of a fourth SIP-200-OK message 321 is confirmed, is shown.

In this case, the IM server unit 302 from the controlling PoC server unit 101 due to the active session state notification service to which the IM server entity 302 at the controlling PoC server unit 101 on the change in the participants of the PoC group communication service session 217 informed by the controlling PoC server unit 101 a second SIP NOTIFY message 322 which generates the SIP URI 326 (sip: userD@xy.de) the fourth PoC client unit 318 contains, with the second SIP NOTIFY message 322 to the IM server unit 302 is transmitted.

The IM server unit 302 may be upon receipt of the second SIP NOTIFY message 322 towards the fourth mobile station 317 and thus the fourth user to the IM group communication service session 316 Invite by the IM server unit 302 a fifth SIP INVITE message 323 forms and this to the fourth IM client unit 319 which received the receipt of the fifth SIP INVITE message 323 and accepting the appropriate invitation to the IM Group Communication Service session 316 by means of a fifth SIP-200-OK message 324 approved.

After receiving the fifth SIP 200 OK message 324 Now all four users are in both the PoC group communication service session 217 as well as in the IM Group Communications Service session 316 recorded (in 3 symbolized by block 325 ).

4 shows a message flow diagram 400 A second embodiment of the invention, in which the subscriber list is synchronized decentralized.

Also according to this embodiment of the invention, it is assumed that between the three mobile radio terminals 111 . 112 . 113 and thus between the three PoC client units 108 . 109 . 110 a PoC group communication service session 217 has been set up and is active, which of the controlling PoC server unit 101 is managed.

According to the second embodiment of the invention, the first user is using the first PoC client unit 108 a first SIP MESSAGE message 401 generated and sent to the controlling PoC server unit 101 the first user uses the controlling PoC server unit 101 requests an IM group communication service session with the same users who are currently also at the PoC group communication service session 217 participate, activate.

The first SIP message message 401 could be realized with a SIP UPDATE message described in [4], a SIP MESSAGE message as described in [5] or a SIP INFO message (described in [6]).

• • „action: activate_parallel_service": dieser Parameter dient dazu, der Controlling-PoC-Server-Einheit 101 mitzuteilen, was sie tun soll, nämlich in diesem Fall einen zusätzlichen Gruppen-Kommunikationsdienst zu aktiveren;
• • „service: IM": dieser Parameter dient dazu, der Controlling-PoC-Server-Einheit 101 mitzuteilen, um welchen neuen Gruppen-Kommunikationsdienst es sich handelt, wobei „IM" für den Gruppen-Kommunikationsdienst-Instant-Messaging steht; und
• • optional die SIP-Adresse der zu kontaktierenden zuständigen IM-Server-Einheit 302.

The first SIP MESSAGE message 401 according to this embodiment of the invention has the following parameters:

• • "action: activate_parallel_service": this parameter is used by the controlling PoC server unit 101 to communicate what it should do, namely to activate an additional group communication service in this case;
• • "service: IM": this parameter is used by the controlling PoC server unit 101 to inform which new group communication service is involved, where "IM" stands for group communication service instant messaging;
• • optionally the SIP address of the competent IM server unit to be contacted 302 ,

Upon receiving the first SIP MESSAGE message 401 The controlling PoC server unit generates this 101 a second SIP MESSAGE message 402 and sends it to the IM server unit 302 which is in the first SIP MESSAGE message 401 is specified and thus activates the desired IM group communication service session at the IM server unit with a generally suitable SIP message 302 , optionally with the list of current participants of the PoC group communication service session 217 (here: first user A, second user B and third user C) mitliefert. The second SIP MESSAGE message 402 contains the parameter "action: activate_parallel_service" described above.

Upon receipt of the second SIP MESSAGE message 402 The IM server unit answers 302 at the controlling PoC server unit 101 in the Session State Notification Service provided by this.

This is done by the IM server unit 302 a first SIP SUBSCRIBE message 403 generated with the parameters "Conference State Event Package" and "usage: parallel_session" and these to the controlling PoC server unit 101 transmitted.

Upon receipt of the first SIP SUBSCRIBE message 403 The controlling PoC server unit determines 101 the at the PoC session 217 participating users or their SIP URIs and forms a first SIP NOTIFY message 404 and transmits them to the IM server unit 302 , In the first SIP NOTIFY message 404 are the SIP URIs 405 . 406 . 407 the one at the PoC session 217 participating users, according to this embodiment: sip: userA@xy.de 405 ; sip: userB@xy.de 406 ; sip: userC@xy.de 407 ,

Upon receipt of the first SIP NOTIFY message 404 The IM server unit loads 302 all the users they are due to the optional subscriber list in the second SIP MESSAGE message 402 or due to the first SIP NOTIFY message 404 knows about an IM group communication service session using appropriate SIP INVITE messages.

in the Contrary to the procedure according to the first embodiment The invention is according to this embodiment The invention also invited the first user (User A).

Inviting is done by the IM server unit 302 generates three SIP INVITE messages and sends them to the IM client units 108 . 109 . 110 transmitted, namely a first SIP INVITE message 408 sent to the second IM client unit 109 a second SIP INVITE message 409 which is sent to the third IM client unit 110 and a third SIP INVITE message 410 which is sent to the first IM client unit 108 is transmitted.

The IM client units 108 . 109 . 110 confirm in case they have the respective SIP INVI TE message 405 . 406 . 407 have received and want to accept the invitation, with one of them each generated SIP 200 OK message.

This means that the second IM client unit 109 optionally a first SIP 200 OK message 411 generated and sent to the IM server unit 302 transmitted, the third IM client unit 110 a second SIP 200 OK message 412 generated and sent to the IM server unit 302 transmitted and that the first IM client unit 108 a third SIP 200 OK message 413 generated and sent to the IM server unit 302 transmitted.

Furthermore, the controlling PoC server unit reports 101 still in the case of the IM server unit 302 provided Session State Notification Service by the controlling PoC server unit 101 a second SIP SUBSCRIBE message 414 generated with the parameter "Conference State Event Package" and this to the IM server unit 302 transmitted.

This will run the PoC group communication service session 217 and the IM group communication service session in parallel between the three mobile stations 111 . 112 . 113 and the associated client units, in 4 symbolizes with block 415 ,

Now, when a new subscriber joins the PoC group communication service session or the IM group communication service session, he becomes, as in the first embodiment of the invention, the messages 320 . 321 . 322 . 323 . 324 described in addition to the other group communication service session added.

There this procedure already in connection with the first embodiment The invention has been described here for reasons of Avoidance of redundancy on a re-description of this procedure waived.

Also, according to this embodiment of the invention, the result is that both the PoC group communication service session 217 as well as the IM Group Communications Service session 415 finally running in parallel between all four users, ie between all four mobile terminals 111 . 112 . 113 . 317 (in 4 symbolized by block 325 ).

The both embodiments described above The invention has in common that they lead to increased signaling in the UMTS mobile communication network lead, if more than just two group communication services be used in parallel in the same group of participants.

There each participating server, i. each participating group communication service server unit at every other server involved, i. with every other group communication service server unit should register to its Session State Notification service to anywhere the Keeping participants list in sync would result in using n simultaneously Group communication services and associated group communication service sessions n · (n - 1) registrations with such a session state notification service and thus also to correspondingly many states that are involved in all server units stored and managed.

5 shows in a message flow diagram 500 the procedure according to a third embodiment of the invention, in which a central synchronization of the subscriber lists is provided.

The starting point is again an already established PoC group communication service session 217 between the three PoC client units 105 . 106 . 107 where the PoC group communication service session 217 from the controlling PoC server unit 101 is managed.

At the time when the controlling PoC server unit 101 the PoC group communication service session 217 according to the in 2 Established and described above, it sets this PoC group communication service session 217 or the temporary group consisting of the current participants of the PoC session 217 exists directly with a group management server unit 501 at.

This takes place according to this embodiment of the invention using group management operations known per se.

• • Group-Type: Temporary 503, d.h. die Art des Gruppentyps ist temporär, sie soll also nur solange gültig sein, wie mindestens eine zugehörige Gruppen-Kommunikationsdienst-Sitzung läuft;
• • Group-ID =, d.h. die Angabe der Gruppen-ID;
• • Established by service: PoC 504, d.h. die Angabe, welcher Gruppen-Kommunikationsdienst (optional mit der zugehörigen Adresse der Server-Einheit) die temporäre Gruppe angelegt hat;
• • Currently used by services (Nähere Angaben über die Gruppen-Kommunikationsdienste, die diese temporäre Gruppe nutzen und somit auch beeinflussen, in diesem Fall nur die aktuelle PoC-Session):
• – PoC:
• – Session-ID 505: PoC_SID_82513261277@PoC-Server17.t-mobile.de
• – Server-Adresse: poc-Server_xy@poc.t-mobile.de
• – Started: 12.01.2005 17:31:05
• • Current Member List, d.h. die aktuelle Teilnehmer-Liste:
• – ID:sip:userA@abc.de; Display-Name: Peter
• – ID:sip:userB@abc.de; Display-Name: Paul
• – ID:sip:userC@abc.de; Display-Name: Panzer.

The controlling PoC server unit generates this 101 a group generation message 502 (Group Creation message), wherein the following parameters should be provided for such a group communication service session or for a temporary group as part of the group management and, if appropriate, in the group generation message 502 as parameters and from the controlling PoC server unit 101 to the group management server unit 501 should be transferred:

• • Group-Type: Temporary 503 That is, the type of group type is temporary, so it should only be valid as long as at least one associated group communication service sit is running;
• • Group ID =, that is the specification of the group ID;
• • Established by service: PoC 504 ie, which group communication service (optionally with the associated address of the server unit) has created the temporary group;
• • Currently used by services (More details about the group communication services that use and thus influence this temporary group, in this case only the current PoC session):
• - PoC:
• - Session ID 505 : PoC_SID_82513261277@PoC-Server17.t-mobile.de
• - Server address: poc-Server_xy@poc.t-mobile.de
• - Started: 12.01.2005 17:31:05
• • Current Member List, ie the current participant list:
• - ID: sip: userA@abc.de; Display name: Peter
• - ID: sip: userB@abc.de; Display name: Paul
• - ID: sip: userC@abc.de; Display Name: Tank.

The group management server unit 501 confirms receipt of the group generation message 502 by means of a group generation confirmation message 506 (Group Creation Confirm message), wherein in the group generation confirmation message 506 optionally a temporary group ID as parameter 507 (Parameter "group_id_temp") and to the controlling PoC server unit 101 can be transmitted.

Subsequently, that is, upon receipt of the group creation confirmation message 506 The controlling PoC server unit generates this 101 a first SIP SUBSCRIBE message 508 with the parameters "XCAP Change Event Package" 509 and "group_id_temp" 510 and logs into the group change notification service described in [7] at the Group Management Server unit 501 according to which over all changes concerning the temporary group the controlling PoC server unit 101 from the group management server unit 501 is informed. The group management server unit 501 in turn logs to the session state notification service, which from the controlling PoC server unit 101 is provided by sending a second SIP SUBSCRIBE message 511 with the parameter "Conference State Event Package" 512 generated and sent to the controlling PoC server unit 101 transmitted.

This will ensure that the subscriber list in the PoC server unit 101 and the current member list in the Group Management Server unit 501 always synchronized.

Now it is assumed that to the already activated PoC group communication service session 217 an additional IM group communication service session should be started in parallel.

For this purpose, the first user generates using the first mobile radio terminal 111 a first SIP INVITE message 513 and sends it to the IM server unit 302 , According to this embodiment of the invention, it inserts into the first SIP INVITE message 513 but not user IDs or group IDs, but the to the current PoC session 217 associated session ID 514 ("PoC_SID_82513261277@PoC-Server17.t-mobile.de") (in this case, however, the option in the group generation confirmation message can optionally also be used 506 provided temporary Group ID temp identification statement are used). Optionally, it can be provided that a parameter is also supplied with which it is stated that the ID 514 is a session ID and the associated group communication service is a PoC group communication service.

The IM server unit 302 Recognizes that the IM users to be invited by a session ID 514 Then, using the Group Change Notification service, you will be asked to contact the Group Management server unit 501 which users are currently at the corresponding PoC session 217 involved or belong to the temporary group. This is done by the IM server unit 302 a third SIP SUBSCRIBE message 515 generated and sent to the group management server unit 501 where in the third SIP SUBSCRIBE message 515 the parameters "XCAP Change Event Package" 516 and usage: parallel_session 517 are included.

This could be in the third SIP SUBSCRIBE message 515 the parameter indicating that a parallel group communication service session should be started with the same users, according to this embodiment specified by the parameter "usage: parallel_session".

After receiving the list of current participants, the IM server unit 302 from the group management server unit 501 using one of the group management server unit 501 generated and sent to the IM server unit 302 transmitted SIP NOTIFY message 518 receives, invites the IM server unit using SIP INVITE messages the corresponding, in the subscriber list using their SIP URIs (SIP URI 519 first user: sip: userA@xy.de; SIP URI 520 second user: sip: userB@xy.de; SIP URI 521 third user: sip: userC@xy.de) to the desired IM group communication service session to be established, with a first SIP INVITE message 522 from the IM server unit 302 to the second IM client unit 110 in the second mobile station 112 a third SIP INVITE message 523 from the IM server unit 302 to the third IM client unit 110 in the third mobile station 113 and a fourth SIP INVITE message 524 from the IM server unit 302 to the first IM client unit 108 in the first mobile station 111 is transmitted.

The receipt and acceptance of the invitation is provided by the IM client units 108 . 109 . 110 the IM server unit 302 signaled by these respective SIP 200 OK messages 525 . 526 . 527 generate and send these to the IM server unit 302 to transfer.

In addition, the group management server unit logs in 501 to the Session State Notification Service at the IM server unit 302 by the group management server unit 501 a fourth SIP SUBSCRIBE message 528 with the parameter "Conference State Event Package" 529 forms and to the IM server unit 302 transmitted. This is due to the parameter "usage: parallel_session" 517 in the third SIP SUBSCRIBE message 515 ,

This will run the PoC group communication service session 217 and the IM group communication service session in parallel between the three mobile stations 111 . 112 . 113 and the associated client units, in 5 symbolizes with block 530 ,

If now a new participant in the PoC session or in the IM session In addition, he is just as additional added to the other session, as in the above illustrated embodiments already explained.

6 shows in a message flow diagram 600 the procedure according to a fourth embodiment of the invention.

The starting point is again a generated PoC group communication service session 217 between the three mobile devices 111 . 112 . 113 where the PoC group communication service session 216 from the controlling PoC server unit 101 is managed.

According to this embodiment of the invention, in turn, a central synchronization of the subscriber lists is provided using the group management server unit 501 ,

According to this embodiment of the invention, the first user sets himself using the first mobile station 111 the PoC session or the temporary group at the Group Management Server unit 501 by adding a group generation message 601 from the first mobile station 111 generated and sent to the group management server unit 501 where the same parameters may be included as in the group creation message 502 according to the third embodiment of the invention.

The first mobile terminal 111 Receives confirmation of receipt of the group generation message 601 on the part of the group management server unit 501 by means of a group generation confirmation message 602 acknowledges which of the group management server unit 501 is generated and the first mobile station 111 is transmitted, specifying the temporary group ID 603 ("Group_id_temp") as a parameter in the group creation confirmation message 602 is included.

When the group is created, the first user gives A, ie the first mobile radio terminal 111 either the session ID of the PoC session 217 or the list of current participants in the PoC session 217 in the group generation message 601 with, where in 6 It is assumed that the session ID 505 is included.

Subsequently, the group management server unit is notified 501 and the controlling PoC server unit 101 to each other at the other notification service by the group management server unit 501 a first SIP SUBSCRIBE message 604 with the parameter "Conference State Event Package" 605 generated and sent to the controlling PoC server unit 101 transmitted and by the controlling PoC server unit 101 a second SIP SUBSCRIBE message 606 with the parameters "XCAP Change Event Package" 607 and "group_id_temp" 608 generated and sent to the group management server unit 501 transmitted.

Thereafter, the first user uses A and thus the first mobile terminal 111 this temporary group ID 608 (instead of the session ID according to the third embodiment of the invention) to an IM group communication service session at the IM server unit 302 to start.

This is done by the first mobile station 111 a first SIP INVITE message 609 he testifies with the parameters "group_id_temp" 610 ie with the temporary group ID and the optional parameter "usage: parallel_session" 611 , bringing the IM server unit 302 is communicated that the parallel session is to be created and thus corresponding to the group management server unit 501 can sign up. The first SIP INVITE message 609 will be sent to the IM server unit 302 transmitted.

Upon receiving the first SIP INVITE message 609 The further steps according to the method according to the third exemplary embodiment of the invention are carried out starting with the generation of the third SIP SUBSCRIBE message 515 until generating the two parallel group communication service sessions, in this case the PoC session 217 and the IM session (symbolized by block 530 ), which is why a further description of this procedure in connection with the fourth embodiment of the invention is dispensed with.

According to a fifth embodiment of the invention, it is provided that the first user or the first mobile radio terminal 111 the controlling PoC server unit 101 , tasked the temporary group in the group management server unit 501 create and receive in the confirmation from the controlling PoC server unit 101 communicated the temporary group ID. Later uses the first mobile station 111 then this temporary group ID (instead of the session ID according to the third embodiment of the invention) to an IM group communication service session at the IM server unit 302 to start. The modification and synchronization of the group communication services and the group communication service sessions are as described above in connection with the third and fourth embodiments.

• [1] J. Rosenberg et al, Network Working Group, Request for Comments (RFC) 3261, SIP: Session Initiation Protocol, Juni 2002;
• [2] A.B. Roach, Network Working Group, Request for Comments (RFC) 3265, Session Initiation Protocol (SIP)-Specific Event Notification, Juni 2002;
• [3] J. Rosenberg et al, draft-ietf-sipping-conference-package-08, A Session Initiation Protocol (SIP) Event Package for Conference State, Dezember 2004;
• [4] J. Rosenberg, Network Working Group, Request for Comments (RFC) 3311, The Session Initiation Protocol (SIP) UPDATE METHOD, September 2002;
• [5] B. Campbell et al, Network Working Group, Request for Comments (RFC) 3428, Session Initiation Protocol (SIP) Extension for Instant Messaging, Dezember 2002;
• [6] S. Donovan, Network Working Group, Request for Comments (RFC) 2976, The SIP INFO Method, Oktober 2000;
• [7] J. Rosenberg, Internet-Draft, Draft-ietf-simple-xcap-package-02.txt, XML Document Format for Indicating Changes in XML Configuration Access Protocol (XCAP) Resources, Juli 2004.
• [8] US 2004/0137882 A1
• [9] US 2004/0199580 A1
• [10] US 2004/0249949 A1
• [11] US 2002/0147777 A1

This document cites the following publications:

• [1] J. Rosenberg et al., Network Working Group, Request for Comments (RFC) 3261, SIP: Session Initiation Protocol, June 2002;
• [2] AB Roach, Network Working Group, Request for Comments (RFC) 3265, Session Initiation Protocol (SIP) -Specific Event Notification, June 2002;
• [3] J. Rosenberg et al, draft-ietf-sipping-conference-package-08, A Session Initiation Protocol (SIP) Event Package for Conference State, December 2004;
• [4] J. Rosenberg, Network Working Group, Request for Comments (RFC) 3311, The Session Initiation Protocol (SIP) UPDATE METHOD, September 2002;
• [5] B. Campbell et al, Network Working Group, Request for Comments (RFC) 3428, Session Initiation Protocol (SIP) Extension for Instant Messaging, December 2002;
• [6] S. Donovan, Network Working Group, Request for Comments (RFC) 2976, The SIP INFO Method, October 2000;
• [7] J. Rosenberg, Internet Draft, Draft-ietf-simple-xcap-package-02.txt, XML Document Format for Indexing Changes in XML Configuration Access Protocol (XCAP) Resources, July 2004.
• [8] US 2004/0137882 A1
• [9] US 2004/0199580 A1
• [10] US 2004/0249949 A1
• [11] US 2002/0147777 A1

100

block diagram

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Controlling PoC server unit

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Mobile communication link

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Mobile communication link

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Mobile communication link

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first Instant messaging client unit

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first PoC client unit

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step

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SIP group resolution request message

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User identification data

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second SIP 200 OK message

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third SIP 200 OK message

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Message flow diagram

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step

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second SIP SUBSCRIBE message

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block

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fourth IM client unit

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fourth SIP 200 OK message

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second SIP NOTIFY message

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Group-Type

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XCAP Change Event Package

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Conference State Event Package

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XCAP Change Event Package

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usage: parallel_session

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Claims (16)

Method for providing multiple group communication services with the same participants • at a first group communication service session of a first Group communication service is provided, the first Group communication service session with a group communication service session identification information, which is a built-up group communication service session identified, identified, from which can be determined which participants in the first group communication service session participate, and • at a second group communication service session of a second Group communication service is provided, wherein the second group communication service another group communication service is the first group communication service, and wherein the participants of the second group communication service session and / or the second group communication service session with the same Group Communication Service Session Identification identified will / will identify with which also the first group communication service session becomes • at in the event of a change at the participants of the first group communication service session using a notification service the participants of the second group communication service session to be updated. Method according to claim 1, in which at least one of the group communication services Cellular group communication service is used. Method according to Claim 1 or 2, in which at least one of the following group communication services is used as the first group communication service and / or as the second group communication service: • Push-to-talk-over-cellular, • conferencing, • multi-user games, • instant messaging, • file sharing, • distributed file editing. Method according to one the claims 1 to 3, • at after the first group communication service session is established has been requested by a subscriber terminal to provide the second group communication service session, • in which using the group communication service session identification determine which participants are participating in the first group communication service session, • in which the determined participants to the second group communication service session be invited. Method according to claim 4, • at the first group communication service session from a first Group communication service server unit is provided, • in which, after the first group communication service session has been established, providing from a user terminal the second group communication service session at a second group communication service session second group communication service server unit with the group communication service session identification transmitted to the second group communication service server unit becomes. Method according to claim 5, • at the first group communication service session from a first Group communication service server unit is provided, • in which, after the first group communication service session has been established, providing from a user terminal the second group communication service session is requested at the first group communication service server unit becomes, • at providing from the first group communication service server unit the second group communication service session at a second group communication service session providing second group communication service server unit is requested, wherein the group communication service session identification information is sent to the second Group communication service server unit becomes. Method according to claim 5 or 6, at the time using the group communication service session identification It determines which participants in the first group communication service session participate by • from the second group communication service server unit at the first group communication service server unit is in demand Using the group communication service session identification, which participants participate in the first group communication service session, and • at the ones participating in the first group communication service session Subscriber of the first group communication service server unit transmitted to the second group communication service server unit becomes. Method according to claim 7, in which determining which participants in the first group communication service session take place using a notification service. Method according to claim 4, • at the first group communication service session from a first Group communication service server unit is provided, • in which from the first group communication service server unit, the group communication service session identification information to a group management server unit that manages subscriber groups becomes, • at the second group communication service session is created, by providing the second group communication service session second group communication service server unit, the group communication service session identification information is determined by the group management server unit. Method according to claim 4, • at the first group communication service session from a first Group communication service server unit is provided, • in which from one to the first group communication service session participating subscriber terminal the group communication service session identification to a group management server unit that manages subscriber groups becomes, • at the second group communication service session is created, by providing the second group communication service session second group communication service server unit, the group communication service session identification information is determined by the group management server unit. A method according to claim 9 or 10, wherein the second group communication service session is the group communication service sit The identification information from the group management server unit is determined using a notification service. Group communication service system • with a first group communication service server unit for providing a first group communication service, which is arranged to be a provided first one Group communication service session with a group communication service session identification which is an established Group communication service session identifies, identifies, from which can be determined which Attending the first group communication service session, and • With a second group communication service server unit for providing a second group communication service, wherein the second group communication service another group communication service is considered the first group communication service, wherein the second group communication service server unit is set up so that they are participants of a provided second group communication service session and / or a provided second group communication service session with the same group communication service session identification identifies with which also the first group communication service session is identified • one Update unit that is set up when one occurs change at the participants of the first group communication service session under Using a notification service the participants of the second Update group communication service session. Group communication service system according to claim 12, wherein at least one of the group communication service server units as a cellular group communication service server unit is set up. Group communication service system according to claim 12 or 13, at least one of the group communication service server units is arranged to provide at least one of the following Group communication services: Push-to-talk over-cellular, • conferencing, • Multi-user Games, • Instant messaging, • file exchange, • Distributed file editing. Group communication service system according to a the claims 12-14, with a group management server unit for management the at least one group communication service session identification information, wherein the group management server unit is connected to the first group communication service server unit and / or the second group communication service server unit is coupled. Group Communication Service Server Unit One Group Communication Service System according to a the claims 12 to 15.