MXPA06009213A - Method for switching between a packet-oriented ptt session and a line-oriented telephone connection among at least two radio communication terminals - Google Patents
Method for switching between a packet-oriented ptt session and a line-oriented telephone connection among at least two radio communication terminalsInfo
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- MXPA06009213A MXPA06009213A MXPA/A/2006/009213A MXPA06009213A MXPA06009213A MX PA06009213 A MXPA06009213 A MX PA06009213A MX PA06009213 A MXPA06009213 A MX PA06009213A MX PA06009213 A MXPA06009213 A MX PA06009213A
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- radio communication
- communication terminal
- link
- ptt
- radio
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Abstract
The aim of the invention is to be able to switch between a packet-oriented PTT session (PC) and a line-oriented telephone connection (TC) as selectable communication links among at least one first involved radio communication device (UE1) and at least one second involved radio communication device (UE2) of a radio communication system (FC). Said aim is achieved by selecting and establishing a first of said two communication links (PC) with the aid of at least one involved radio communication device (UE1) and/or at least one control unit (PTTS1) of the radio network of the radio communication system (FC). Switching takes place from said established, first communication link (PC) to the second communication link (TC) under the control of a radio communication device (UE1) involved in the first communication link (PC) and/or the control unit (PTTS1) of the radio network of the radio communication system (FC) involved in the first communication link (PC) by activating the second communication link (TC) while the first communication link (PC) is still active.
Description
PROCEDURE TO CHANGE BETWEEN A PPT SESSION SWITCHED BY PACKAGES AND A TELEPHONE LINK
COMMUTED THROUGH THE LINE BETWEEN AT LEAST TWO
RADIO COMMUNICATION TERMINALS
FIELD OF THE INVENTION A method for switching between a packet switched PTT session and a switched telephone link through the line between at least two radio communication terminals, network components as well as radio communication system is described. BACKGROUND OF THE INVENTION So that for example two subscribers in a radio communication system can communicate or exchange useful data through their radio communication terminals, usually a telephone link is formed, referred to as switched by the line ("Circuit S"). itched "), between these two radio communication terminals through their air interfaces to the radio network. These telephone links commuted by the line allow users of both radio communication terminals in a so-called full duplex ("Full Duplex") procedure, this is in the direction of transmission back and forth, can speak and hear simultaneously, this is they can communicate at the same time. The line-switched telephone link formed between the participating radio communication terminals is also maintained by none of the users of the radio communication terminals in question, neither speaks nor sends useful data. The telephone link between both radio communication terminals remains stable until one of the radio communication terminals deactivates the telephone link. In contrast to this, in practice for some communication situations it is advantageous to the service called
"Push-to-Talk (PTT)" (press to talk). In that service
PTT participate several radio communication terminals, in such a way that a specific PTT group is formed. In which only one of the several participating radio communication terminals can receive a transmission authorization to send or transmit useful data, especially voice messages, to the other radio communication terminals participating in the PPT service. The sending of the transmission authorization is received by the user of a radio communication terminal, when this user by pressing a special PTT key on his radio communication terminal requests it from his network PTT server. If that user presses the key on his radio communication terminal first than other users participating in the PTT service, then the PTT server sends him the sending or transmission authorization to transmit a voice message or other useful information to the other terminals of radio communication participants. During the time that the PTT key is held down, the transmission authorization granted by the PTT server is retained, while the possibility of transmission for user of the other participating radio communication terminals is blocked. Thus the voice or the useful data, already during the conference of the issuer from its radio communication terminal, are distributed (strea ing) to the radio communication terminals of the PTT group almost in real time through the server in the network of radio. In particular, the PTT server can grant a maximum authorization duration, in which only a transmission is possible for the issuer at that time authorized. During the transmission of voice and other useful data of the radio communication terminal authorized at that time, the other radio communication terminals of the same PTT group receive the voice or useful data messages from the radio communication terminal authorized to transmit and they can not transmit their own messages from you through the PTT server. Only when the user of the momentary transmission authorization stops pressing the PPT key of his radio communication terminal, does he give his exclusive transmission authorization. This authorization is then granted by the PTT server to the radio communication terminal whose user was the next to press the PTT key on its own radio communication terminal. Said this with other words, this means that during the transmission of a voice message through the radio communication terminals, the other radio communication terminals participating in the PTT service can listen to that voice message and can not interrupt the user of that communication terminal by radio. In this way the PTT service allows only one of the radio communication terminals of the group of radio communication terminals participating in the PTT service to send a voice message or useful data simultaneously in a so-called semi-duplex procedure ("Half Duplex "), which can not be interrupted by the other radio communication terminals. Preferably the authorized user in question of a service or PTT function in particular after pressing a special PTT key on his radio communication terminal can transmit voice messages and useful data almost in real time. The operator of one or several of the receiving radio communication terminals participating in the PPT service after stopping pressing the PPT key on the radio communication terminal currently authorized to transmit, has the possibility of transmitting a response in the corresponding manner . For this, the PPT server grants a transmission authorization to one of the radio communication terminals ready to answer, while the other radio communication terminals participating in the PTT group can only receive the reply message and during the transmission are blocked. and they can not transmit answers. Each of the radio communication terminals belonging to the same PTT group and which wishes to transmit voice messages or useful data, sends a request to the PPT server in charge of the network and receives correspondingly a transmission authorization, while the other terminals of PTT group radio communication are authorized only to receive. In particular, it can be advantageous if the user of the radio communication terminal of the PTT group and for the duration of the authorization of the radio communication terminal authorized to transmit can transmit useful voice or data to the PTT server, the PTT server blocks its retransmission and performs intermediate storage. Only after the transmission has been completed or when the maximum authorized authorization time of the radio communication terminal at that authorized time has elapsed, the granting of the transmission authorization is controlled by the PTT server in charge in such a way that the stored voice messages Intermediate or current are transmitted by the radio communication terminal, whose user was the first of all the other members of the PTT group that has pressed the PTT key. In this way, the PTT service, from the point of view of the user, resembles the known "Walkie-Talkie" service of classic CB radios. However, contrary to these, the radio communication terminal authorized to transmit can communicate through the radio network of the radio communication system, with remote radio communication terminals, which are registered to the same PTT service. In particular, the radio communication terminals inscribed to the PPT service in question can be located in different radio cells of a radio communication system. Most advantageously, the maximum allowed time of authorization for the transmission right may be set at a higher limit. Then the user of the radio communication terminal authorized to transmit can only transmit useful voice and data messages to the participating radio communication terminals, up to that maximum allowed upper limit of tempo, even when you hold down your PTT key. Thus, the radio communication terminal can eventually participate in several PTT services at the same time. For modern radio communication systems, it is especially desired to implement this type of PTT service in the form of packages, this is "Packet switched". In radio communication systems, the so-called IP Multimedia Subsystem (IMS) or a suitable system has been preferably used. The activities corresponding to this have been carried out in the international standardization guilds 10 such as "Open Mobile Alliance (OMA)" and "3rd Generation Project Partnership (3GPP)". During the full-duplex principle the telephone link switched to the line between two radio communication terminals promotes an alternate exchange of voice messages at the same time as well as other useful data in the round-trip direction, the semi-duplex system of a PTT service allows the sporadic transmission of a voice message or other data through a single radio communication terminal of the PTT group of that PTT service, simultaneously to all the members of that PPT group only in the address outward. When a member of that PTT group wishes to send a voice message to all other members of that PTT group, then it can be done for example by spontaneously triggering a special PTT key.
With this, network and network resources are used only then, with their consequent cost, when a voice message is actually transmitted within the PTT group. A typical application of the PTT service is presented, for example, when the central organization of a logistics company wants to have contact again and again with years of its truck drivers, to give them new instructions. Otherwise, it is desired that the truck driver in question send a short voice message or a reply to the central organization from time to time. To make possible this sporadic transmission of voice messages, during the course of a pTT session between the central organization and the truck driver in questions. When one of the participating truck drivers or the central organization wishes to issue a voice message to the other members of that PPT group, it can do so spontaneously, for example by means of the activation of the PTT key on its radio communication terminal. This is how radio resources and capabilities are used in the network when voice messages or useful data will actually be transmitted from the authorized radio communication terminal. Expressed in a general way, a session is advantageous when, from a temporal point of view, only voice or data messages are transmitted periodically in a certain transmission direction:
On the other hand, in this case, it would be too annoying and time consuming to establish telephone links between the authorized radio communication terminals and all the radio communication terminals that receive the PPT group. The continuous telephone links established in this way would be too expensive and would occupy too much transmission capacity in the radio network and especially in the interfaces of the participating radio communication terminals. If, on the other hand, a transmission in a single address is not required from the radio communication terminals in question to the other radio communication terminals of the PTT group in question, but an alternate discussion or conference is required simultaneously between at least two terminals of radio communication in the round-trip direction, then the characteristics of the semi-duplex transmission procedure of a PTT session are rather disadvantageous. Since those who with the help of their radio communication terminal transmit a voice message to the other radio communication terminals of a PTT group, they block during the transmission period, the issuance of a voice message by the parties. receiving radio communication terminals. The receiver can not interrupt the sender or respond to him when he says something.
In addition, anyone who wants to issue a voice message, in practice receives authorization only when you have previously pressed a PTT key call on your radio communication terminal. These are factors, which are disadvantageous during the discussion or during the course of a conference, in such a way that a telephone link between the participating radio communication terminals would be more appropriate. SUMMARY OF THE INVENTION The present invention proposes the task of showing a way how the user of a radio communication terminal can establish a communication link adapted to the given communication situation in a flexible and comfortable way. This task is solved by means of the following procedure: The procedure for switching between a packet switched PTT session and a switched telephone link through the line as selectable communication links between at least one first radio communication terminal and at least a radio communication terminal participating in a radio communication system, in which the first of those two communication links is selected and established by at least one participating radio communication terminal and / or by means of a control unit of the radio network of the radio communication system and in which said first communication link is switched to a second communication link under the control of a first radio communication terminal participating in the communication link and / or the control unit that participates in the first communication link of the radio system network radio connection, for which the activation of the second communication link still takes place during the existence of the first communication link. The activation of the second communication link is still carried out during the existence of the first communication link, it can be switched directly and continuously between both communication links: Depending on the existing communication situation, the operator of the radio communication terminal in question can select the most advantageous situation of the two types of communication links and switch to that. Since the activation of the second communication link is still introduced during the existence of the first communication link, the user of the radio communication terminal in question makes possible a direct transmission of the first communication link to the second. In particular, an existing packet-switched PTT session between at least one first radio communication terminal and at least one radio communication terminal can be switched to a line-switched telephone link between those participating radio communication terminals, one direct and constant way even during the session or the PTT phase. On the contrary, during a switched telephone link through the existing line, at least one first and a second radio communication terminal can be switched directly to a packet-switched PTT session, the activation of the desired PTT session being carried out already during the existence of the telephone link switched through the line. In this way, the user in question can select in a flexible and comfortable manner the type of communication link, which is more specifically adjusted to the communication situation existing at that moment, that is, it can select the type of communication that is most suitable. for a specific communication situation. With this you can individually adapt your communication link to different communication requirements.
It can be particularly advantageous when, from a first radio communication terminal to a second radio communication terminal via an existing first communication link, at least one control signal is transmitted, with which it is communicated to the second terminal of radio communication the desire to change from the first radio communication terminal of the first communication link already established to the second communication link. Additionally or independently it may be advantageous if, from the first and / or the second communication terminal 'by radio is transmitted by the first communication link already established to that control unit which is responsible for the first communication link established, at least one control signal with which the desire to switch the first and / or second radio communication terminal of a first communication link to a second communication link is communicated. Additional or independently of this may be advantageous when the first communication link already established by the first and / or the second radio communication terminal is transmitted to the control unit responsible for the second communication link to be established, at least a control signal, with which the control unit is notified of the desire of the first and / or the second radio communication terminal to switch from a first communication link to a second communication link. It may optionally be advantageous when the first communication link already established by the control unit transmits the control signal on the switching point of the first and / or the second radio communication terminal to that control unit, which is responsible for the activation and establishment of a second communication link. Advantageously in that type of control signal one or more address parameters of the radio communication terminal participating in the first communication link to which the switching desire is directed, and / or the radio communication terminal of participant in the first communication link, from which follows this wish to switch, and / or at least include an identification parameter to describe the first communication link established for the second communication link to be established. With the help of the identification parameter in the control signal to the first communication link already established, the second communication link to be established is assigned, in such a way that a clear connection is made between the first communication link already established and the second desired communication link. This results in the association or connection between both communication links, which allows a clear assignment or relationship between them. The identification parameter here represents the connection or link parameter of the first established communication link, which must be dissolved by the second new communication link due to the desire to switch the user of a radio communication terminal participating in the first communication link . In this way it is possible, especially in that radio communication terminal, to which the switching desire is directed, and / or the control unit responsible for the second new communication link, to indicate that the first link of existing communication, belongs to a second communication link, which has just been switched. This is advantageous, for example, when switching from the PTT service to the telephone link between two radio communication terminals, and simultaneously entering at one of the participating radio communication terminals, a telephone call from a third non-participating radio communication terminal of the PTT service. Thanks to the identification parameters, the radio communication terminal participating in the telephone link in question is clearly identified, to which the outgoing PTT session belongs. This produces a type of filtering function, which allows the radio communication terminal to determine or differentiate which of the incoming telephone calls in parallel certainly belongs to the existing PTT session. Similarly, the link or the relationship between an existing telephone link between at least two radio communication terminals and a subsequent specific PTT session under the participation of the same radio communication terminals when switching the telephone link to a PPT session by means of the transmission of an identification parameter for the telephone link of the control unit, which is responsible for the second communication link, and / or to that radio communication terminal of the first communication link, to which the desire is addressed of communication and / or is dissolved by this. The identification parameter transmitted as represented for the first communication link allows a particularly advantageous and convenient way of an automated change to a second and new desired communication link without requiring the user of the radio communication terminal to which it is attached. directed the desire to commute actively participate. Advantageously, the identification parameter is transmitted to the radio communication terminal, to which the switching desire is directed by another radio communication terminal participating in the first communication link. If the switching is activated and controlled by a control unit in the radio network, then it is advantageous to transmit the identification parameter to all the radio communication terminals, which participate in the first communication link, and which now participate in the communication. switching to the second communication link. The invention also relates to a radio communication terminal with a control unit for carrying out the method according to the invention. Furthermore, the invention also relates to a network component with a control unit for carrying out the method according to the invention. From this the invention relates to a radio communication system with a first group of network components for selecting and preparing a packet-switched PTT session as well as a second group of network components for selecting and preparing a telephone link switched by the line as selectable communication links between at least one first participant radio communication terminal and at least one second radio communication terminal participating in a radio communication system, both groups of network component having both control means to perform the procedure according to the invention. Other embodiments of the invention are presented in the dependent claims. BRIEF DESCRIPTION OF THE FIGURES The invention and its modalities are described in detail below with the help of the figures. In which: Figure '1: shows a schematic representation of the main components of the network architecture of a radio communication system to form a packet-switched PTT session between at least two radio communication terminals, of which according to the different variants of the method according to the invention, it is switched to a switched telephone link through the line between two participating radio communication terminals; Figure 2 shows a schematic representation of additional network components in the network architecture of Figure 1, with whose help, simultaneously, this is parallel to the packet-switched communication links already established between both radio communication terminals can be established a communication link switched through the line according to different variants of the method according to the invention; Figure 3 shows a schematic representation of the switched telephone link through the desired line as a new second communication link between the two radio communication terminals of Figure 2 after undoing or terminating the PTT session;
Figures 4, Y 5 show a schematic representation of the exchange of message and control signals through interfaces of both radio communication terminals of Figure 1, to communicate their switching from the existing packet switched PTT session to a telephone link switched through the line; Figure 6 shows a schematic representation of the signal flow of information and control signals between the components of the radio network of Figure 1 and the radio communication terminal, which has the desire to switch from the PTT session to a link telephone switched through the line, to perform another variant of the method according to the invention; Figure 7 shows a schematic representation of the network architecture of Figure 1 and Figure 2 for switching from a packet-switched PTT session to a telephone link switched through the line between two participating radio communication terminals, in the which according to another variant of the method according to the invention controls the switching between these two types of communication links by means of a control unit of the PTT service;
Figure 8 shows a schematic representation of the signal flow between the components between the network components of the radio network architecture of Figures 1 and 2, and the first radio communication terminal of Figure 1, from which the desire to change their telephone link so far switched through the line to a packet-switched PPT session according to another variant of the method according to the invention. DETAILED DESCRIPTION OF THE INVENTION The elements with the same impact function in figures 1 to 8 are provided with the same reference numbers. Figure 1 schematically shows the main components of a network architecture as part of a radio communication system FC, with the help of which for example a PTT PC service is produced for two radio communication terminal UEl, UE2 as the first type of communication. communication link. Here is the first radio communication terminal UEl through the network components such as PSNW1, IMS1, MSC1 of a first operator or network provider NW = 1, as well as the second radio communication terminal UE2 through the network components PSNW2, IMS2, MSC2 of a second network operator N 02, are joined with a common PTT server PTTSl. This controls the exchange of voice and / or data messages between both radio communication terminals UEl, UE2 in a manner corresponding to the known principle "push-to talk" The affiliation of the radio communication terminal in question UEl or UE2 thus as the assigned components of the network side to the network operator concerned N Ol or NW02 is shown in Fig. 1 by means of a dotted dividing line TR. The signaling links between the radio communication apparatus and the network components allocated on the network side of the network operator in question are represented by solid lines in FIG. 1, while the corresponding separate links are represented by lines continuous In particular, the first radio communication terminal UEl by means of the so-called radio access network or "Radio Access Network", which is omitted here in figure 1 for reasons of clarity in the drawing, has access to the switched network in packages or "Packet Switched Network" PSNW1 from your NWOl provider, which has been assigned to you by the network.
Such a packet-switched network can, for example, be formed by means of a GPRS network (General Packet Radio Service). It has as its main components a so-called SGSN element (Serving GPRS Support Node - GPRS service support node), this is a GPRS network node SGNS1 as well as an element called GGSN (GPRS input support node) or GGSN1 input. The first radio communication terminal UEl is connected to the SGSN element SGSN1 of the "Packet Switched Network" PSNW1 via a communication link SL11 to transmit control or signaling signals as well as to perform a DLll communication link to transmit data tools. The control signals are exchanged between the SGSN element SGSN1 and the element GGSN GGSN1 via a signaling link SL1, as well as data through a DL12 data link. Through the element GGSN GGSNl there is a signaling link SL13 for the element CSCF ("Cali- State Control Funktion") of a so-called "Multimedia IP Subsystem (IMS- IP Multimedia Subsystem" IMS1) That subsystem is a part of the radio network which, according to the IP protocol, controls the communication traffic between the radio communication terminal UEl and the PTT server PTTSl The CSCF component CSCF1 again has a signaling link SL15 to the PTT server PTTSl In this way the GGSN component GGSNl indirectly has a signaling link through the CSCF component CSCG1 to the PTT server PTTSl.In addition it presents a separate DL12 direct data link to the PTT server PTTSl. the second radio communication terminal UE2 is communicated via a signaling link SL21 as well as a data link DL21 with the SGCN component SGSN2 of a "Pa cket Switched Network ", this is a packet switched network, PSNW2 from your provider NW02. That SGSN component SGSN2 exchanges control signals through a proprietary link SL22 as well as data signals through DL 22 proprietary data links with a GGSN component GGSN2, which produces an output or gateway to a "IPO multimedia subsystem" "IMS2. Through the GGSN component GGSN2 a DL23 direct data link is provided to the PTT server PTTSl set. Each signaling in the IP multimedia subsystem "IMS2 passes through a CSCF component CSCF2, which represents a core element of the IP multimedia subsystem" IMS2. For this, the GGSN component GGSN2 has a signaling link SL23 to the CSCF component CSCF2. Through the CSCF component CSCF2, an SL25 signaling link is also formed with the PTT server set PTSS1. With the help of the CSCF component CSCF2, other application servers can also be controlled. Preferably for signaling between both radio communication terminals UEl, UE2 and the PTT server set PTTSl as well as the intermediate network components SGSN1, GGSN1, CSCF1, CSCF2, GGSN2, SGSN2 uses the so-called SIP protocol (Session Initiation Protocol). of Start of Session). If the user of the first radio communication terminal has first pressed the PTT key, then the PTT server PTTSl transmits a transmission authorization for a maximum authorization period, during which the terminal can transmit to the second radio communication terminal UE2, a voice message or other data with the intermediate transmission to the PTT server set PTTS. During the occupation of the rights of transmission or diffusion through the first radio communication terminal UEl, the PTT server PTTsl withdraws the transmission authorization to the second radio communication terminal, in such a way that it can only receive messages . After finishing the transmission of the voice or useful data through the first radio communication terminal UEl, which occurs in particular when the PTT key is not pressed, the PTT server PTTSl withdraws the transmission authorization to the first radio communication terminal UEl. This means that the first radio communication terminal UEl can certainly still transmit voice messages or other data to the PTRT server of PTS1 in the form of data packets, but the PTT server PTTSl blocks the retransmission to the second communication terminal by UE2 radio and throw away those data packets. Alternatively, these data packets can be stored for such a long time until the PTT server PTTSl again grants the transmission authorization to the first radio communication terminal, when this is requested again. This presupposes that the user of the second radio communication terminal UE2 has not previously concluded with his authorization and still speaks.
Generally considered, the user of the radio communication terminal can request the PTT server the individual transmission authorization by pressing the PTT key on his radio communication terminal, to individually transmit a message to another participant radio communication terminal. Thereafter, the server grants that radio communication terminal a transmission authorization for a predetermined period of time, if another participating radio communication terminal has not previously submitted its request for authorization. In this way, the PTT server only assigns an authorization to the radio communication terminals participating in the PTT service at the same time. This is how the PTT server controls the retransmission of messages from the radio communication terminal authorized for transmission. Furthermore, only the radio communication terminal authorized to transmit can terminate a message by disconnecting from the joint PTT server, while one or more of the other radio communication terminals that participate in the PTT service receive this message and, on their side, can not simultaneously transmitting voice messages to the participating radio communication terminals at the same time. Thanks to the transmission of data packets, it is possible to transmit messages to the joint PTT server. There the incoming messages are either discarded or stored, until the radio communication terminal authorized to transmit, has withdrawn its transmission authorization from the PTT server. During the transmission of messages from the currently authorized radio communication terminal, in the forward direction towards the other radio communication terminals, the PTT server does not receive the messages in the opposite direction. As long as the user of the authorized radio communication terminal speaks, users of one or more participating radio communication terminals can only listen and can not interrupt the user of the authorized radio communication terminal that is at speaks. Eventually instead of the PTT server PTTSl, which is jointly associated with the network parts of both providers NWOl, NW02, a PTT server can be provided for each part of the network of both providers NWOl, NW02. In particular then the "IP multimedia subsystem" IMS1 as well as the "packet switched network" PSNW1 of the first provider NWOl are assigned only to the PTT server PTTSl, while the "IP multimedia subsystem" IMS2 as well as the "packet switched network" "PSNW2 from the first provider NW02 are assigned specifically to the PTT server PTTS2. This is further shown in Figure 1 with puted lines. Presenting a signaling link SL25 * to the component of CSCF CSCF2 and a data link DL23 * to the component of GGSN2 GGSN2 analogous to the communication link scheme in a PTT server PTTSl. Both PTT servers PTTSl, PTTS2 have on their side a communication link between themselves KV12, through which data and / or control signals can be transmitted. Links DL23 and SL25 to the first PTT server PTTSl can be sold omitly. Preferably the PTT server has control over the PTT session, which is responsible for the radio communication terminal, which has initiated or introduced the PTT session. Here in the embodiment of FIG. 1, the PC PPT session has been completed by the radio communication terminal UEl and therefore the PTT server PTTSl is assigned specifically for the network by its NWOl provider for the control of the course of the PC PTT session. The second PTT server PTTS2 forms a passive component and serves mainly to relay the voice or data messages controlled by the PTT server PTTSl to the second radio communication terminal UE2. Obviously it is also possible that the second PTT server PTTS2 assigned on the receiving side coordinates or controls instead of the first PTT server PTTSl assigned on the transmission side, the transmission of messages to the second radio communication terminal UE2. For this the first PTT server PTTSl directly transmits the voice messages emitted by the first radio communication terminal UEl, through the communication link KV12 to the second PTT server PTTS2, which then actively regulates or controls the assignment. Now it can be presented that the user of both radio communication terminals UEl, UE2 not only transmits individual voice messages periodically, but wants to carry out an alternate continuous discussion or discussion with them. Since a normal telephone link is more suitable for different communication requirements, still during the existing PTT PC session it introduces the activation of the switched telephone link through the line between the radio communication terminals UEl and UE2, participants of the service of PTT PC. Considered in a general way also during the current PTT session between two or more. Radio communication terminals are switched to a normal telephone link between those participating radio communication terminals. For this the PTT session is preferably performed in the so-called "Packet Switched Domain" - this is the packet switched domain I through the "IP multimedia subsystem", while the normal telephone link is implemented in the call in the "Public Switched" Telephone Network Domain (circuit switched) "; this is in the public switched telephone network domain, switched over the line. In the present exemplary embodiment of FIG. 1 with the PTT server set PTTSl, the first radio communication terminal UEl transfers the already existing PTT PC session to a TC telephone link switched over the line , to the second radio communication terminal UE2 in such a way that through a control signal or notification IS1, it informs its desire to change to the second radio communication terminal UE2 participants in the PTT session. In this control signal IS1, the first radio communication terminal UEl preferably communicates its own telephone number PN1 as well as in particular the telephone number PN2 of the second radio communication terminal UE2 which will be called, a unit switching device MCS1 assigned by the network to the provider NWOl, in the network domain switched over the line, The switching unit MSC1 thus transmits a corresponding control signal IS1 * with the telephone numbers PN1, PN2 to a switching unit MSC2 active on the receiving side in the network domain switched through the line of the second provider NW02, to which the second radio communication terminal UE2 is assigned. The MSC2 switching unit asks the user of the second radio communication terminal UE2 with an IS1 ** request signal if it accepts the desire to change the first radio communication terminal. This is confirmed by the user of the second one with a response signal RISI, which is transmitted by the switching units MSC1, MSC2 to the requesting radio communication terminal UEl. Only after the positive confirmation of the exchange desire on the part of the second radio communication terminal UE2 is a switched telephone link through the line established in the round-trip direction through the switching units MSC1, MSC2 between both terminals of radio communication. The first radio communication terminal UEl with the help of the network components that are responsible for the switched telephone link through the line, can initiate the formation of a normal telephone link with the second radio communication terminal UE2. In Figure 1 for reasons of clarity in the drawings, as main components are shown representing the position of the components of the switched part through the line of the radio network, mainly the switching units, especially the so-called "Mobile" Switching Center - Mobile Switching Center "MSCl, MSC2. Here the switching unit MSC1 is assigned to the first radio communication terminal, while the second switching unit MSC2 operates the second switching unit UE2. Eventually the MSCl switching unit,
MC2 assigned to the transmission and / or transmission side, also immediately without the user of the second radio communication terminal UE2, responding to the desire to change the first radio communication terminal, can establish a switched telephone link through of the line. In other words, this means that the radio communication terminal with the desire to switch to the switched telephone link through the line, can establish that link with the second radio communication terminal UE2, directly with the help of the units of communication. switching MSC1, MSC2, without the need to transmit the request signal IS1 ** to the second radio communication terminal
UE2. For activation, it is sufficient for the first radio communication terminal UEl to transmit the control signal IS1 to its assigned switching unit MSC1, which thereafter performs the additional steps for establishing the switched telephone link through the line. This is possible since the switching unit MSCl transmits the telephone number PN2 of the second radio communication device UE2 in the control signal IS1. As there is already a so-called SIP session
(session initiation protocol) between both radio communication terminals UEl, UE2 through the existing "IP multimedia subsystems" on the network side IMS1, IMS2, the first radio communication terminal UEl already knows the SIP address of the second radio communication terminal UE2 and can communicate it to the IS2 control and notification signal via a direct transmission path without intermediate switching to the PTT server PTTSl with the help of the SIP protocol through the components CSCF1, CSCF2 to the second radio communication terminal UE2. Eventually the radio communication terminal UEl that wants to change, from the telephone number that knows the second radio communication terminal UE2 can also form a so-called "TelURI" as the SIP address, when this is stored in the network. This SIP address formation for the second subscriber can be realized in particular from the known telephone number of the second radio communication terminal through a network component such as the PTT server set PTTSl. Preferably the control signal with the desire to change the user of the first radio communication terminal UEl also through the PTT server PTTSl to the second radio communication terminal UE2, in such a way that it acquires that information. This notification signal is shown in FIG. 1 additionally with dotted lines and is provided with the reference number IS2 *. If the operator of the second radio communication terminal UE2 accepts the desire to change the operator of the first radio communication terminal UEl. Then it sends a confirmation signal RISl. The generation of the confirmation signal RIS2 can be performed actively by the user of the second radio communication terminal. It can also be advantageous if the second radio communication terminal UE2 produces the confirmation signal RIS2 autonomously (without the user making the request) and transmits it back to the first radio communication terminal. Additionally or independently it may also be advantageous if the first radio communication terminal UEl sends to the PTT server PTTSl a control signal or notification about its desire to change, or it then retransmits a notification signal with the intermediate switching of the CSCF component CSCF1 of the "IP Multimedia System" IMS1 to the switching unit MSC1, which remains to the network domain switched through the line of the radio communication system. In FIG. 1 is a notification signal, which is transmitted from the PTT server PTTSl to the switching unit MSC1 through a signaling link LSM11, is shown by means of an arrow with dashed lines, which is designated with SM1. The signaling link LSM1 is there also drawn with dotted lines. Generally expressed, also the control unit responsible for the established PTTT PC session transmits a notification signal on the desire to change the first radio communication terminal to the corresponding control unit on the network side, which is responsible for the activation and establishment of the TC telephone link switched through the line. In particular, the control unit for the PTT session is formed by means of a PTT server. As a control unit for the switched telephone link via the line, an MSC switching unit is used in particular. In the control or notification signals IS1, IS2, IS2 * SM1 in addition to the telephone numbers PN1, PN2 an identification parameter can be additionally included which clearly identifies the active PTT session, so that the telephone link TC switched through the newly formed line, can be clearly assigned to the existing PTT PC session. The transmission parameters PNl, PN2, Pl are shown in figure 1 in parentheses behind the control signals IS1, IS2, IS2 *, SMI. Only by means of the identification parameter included Pl can a clear link, link or relationship be made between the existing PC-specific PTT session and the desired TC telephone link (and vice versa), differentiating that pair of communication links PC, TC from other incoming calls and / or other PTT sessions. In particular, this pair formed of the corresponding PTT session and telephone link can be extracted, that is to identify itself in front of other telephone calls and / or normal PTT sessions. Figure 2 shows the telephone link TC switched through the line, formed additionally between both radio communication terminals UEl, UE2. This telecommunications link switched through the TTC line now exists in parallel, this is simultaneously to the PTT PC session already established or previously existing, from which it is derived to a normal TC telephone link. The group of network components is designated in Figure 2 with Gl, as well as the group of network components for selecting and preparing the switched telephone link through the TC network, is designated with G2. The established telephone link TC starting from the first radio communication terminal UEl includes a signaling link Sil as well as a data link DI to the assigned switching unit of the network side MSCl. This is representing the position of the other components of the switched part through the line CSNW1 of the radio network. The switching unit MSC1 is linked to the switching unit MSC2 via a signaling link SU12 as well as a data link D12. This also represents the other components of the switched part via the line CSNW2 of the radio network, to which it is assigned to the second radio communication terminal UE2. The second switching unit SC2 is also linked via a corresponding signaling link SI2 and a data link D2 with the second radio communication terminal U2. In the next step, after the activation or possibly after the establishment of the switched telephone link through the TC line, the PC PTT session is established. This state is represented in Figure 3. There both radio communication terminals UEl, UE2 no longer have communication links with the components of the packet-switched network part as well as with the PTT server PTTSl. Obviously the change of the switched session by PTT PC packets to the switched telephone link through the TC line can also be promoted and performed correspondingly through the second radio communication terminal UE2. To be able to generate a control or notification signal to change the type of communication link PTT service to switched telephone links through the line (and vice versa), the radio communication terminal in question UEl or UE2, has a control unit ST1 or ST2. Preferably the user of the radio communication terminal in question prepares a selection edure in its service menu, in order to be able to operate the control unit of its radio communication terminal. Generalizing to switch from the PC packet switched PTT section to the switched telephone link through the TC line, one or more address parameters are transmitted from at least one radio communication terminal participating in the PTT session and / or at least an identification parameter of the PTT session by means of at least one control signal to the control unit that is responsible for the telephone link switched through the line. These addressing parameters are formed in particular by the telephone numbers PN1, PN2 of the participating radio communication terminals. Here in the embodiment example of figure 1, the PTT server PTTSl as control unit for the session of
PTT PC transmits to the control unit MSC1, in a control signal SM1 through the signaling link LSM11, for example the telephone numbers PNl, PN2 of both radio communication terminals UEl, UE2 as well as the identification parameter Pl. If, on the other hand, a switched telephone link is already established via the TC line between both radio communication terminals UEl, UE2, and now it is desired to change to a PTT PC session, then one or more address parameters are also transmitted from at least one of the radio communication terminals UEl, UE2 participating in the telephone link switched through the TC network, as well as an identification parameter TI as a clear characteristic of the telephone link switched through the network, by means of at least one control signal to the PTT server PTTSl as the control unit, which is responsible for the packet switched PTT PC session. This type of control signal can in particular be generated by that control unit which is responsible for the switched telephone link through the TC line, and is transmitted directly to the control unit which is responsible for the switched PTT PC session by packages. In figure 3 it is additionally shown by means of a dotted line that for example the switching unit MSC1 which is assigned to the first radio communication terminal UEl, transmits an MSI control signal (IP1, IP2, TI) through an LMS1 signaling link through the CSCF component CSCF1 in the "IP multimedia subsystem" IMS1 directly to the PTT server PTTSl. This control signal MSI contains in particular the IP or SIP addresses IP1, IP2 of the radio communication terminals UEl, UE2 participating in the switched telephone link via the TC line, as well as the identification parameter TI for the telephone link already existing TC. The addresses IP1, IP2 of both radio communication terminals UEl, UE2 for the desired establishment of a packet switched PTT service, the switching unit MSC1 already knows them by a previous PTT session or this switching unit MSC1 has requested those addresses to both radio communication terminals UEl, UE2. Eventually the radio communication terminal that wishes to change to the PTT session transmits its own packet-switched address (for the PTT session) as well as that of the desired partner in the conference or the form from the telephone number it knows in form of URI addresses (Uniform resource identifier - uniform resource identifier). Here the packet-switched address of the conference partner can also be requested by means of a request signal from the radio communication terminal in question that activates the change of the switch telecommunication link through the line to a PPT session switched by packets. That request can possibly be made by means of the switching unit or control assigned on the side of the network, to which it is assigned to the radio communication terminal that wishes to change the telephone link to the PTT session.
Alternatively to the control of the change of the telephone link switched via the TC line to the PC packet switched PTT session through that control unit which is responsible for the switched telephone link through the TC line, according to a variant preferred, the radio communication terminal in question, which wishes to change, may also send a corresponding control signal to the PTT server. In figure 3 the first radio communication terminal UEl sends to the PTT server PTTSl, a direct control signal MSI, which contains the address parameters IP1, IP2 as well as the identification parameter Ti, through the components SCGN1, GGSNl, CSCF1. The generation of the control signal MSI * with the IP1 address parameters, IP2 as well as the identification parameter TI is realized here by means of the control unit ST1 of the radio communication device EU1, this means that the radio communication terminal UEl completely controls the change of the switched telephone link through the the TC line already established to the PTT session switched by PC packets. Eventually the control unit ST1 can also request the IP2 address parameter via the already existing telephone link TC, the second radio communication terminal UE2 or the switching unit commissioned MSC2, or it can produce it via the telephone number PN2 which You already know or have already determined. Alternatively to this after the control signal MSI *, instead of the radio communication terminal UEl, preferably the PTT server can completely control the change of the switched telephone link through the newly established TC line to the switched PPT session by PC packages. For this, it has an SVS control unit (see figure 1). The first radio communication terminal UEl 'also signals directly via the control signal MSI * to the PTT server PTTSl, its desire to change to a specific PTT service. After this the PTT server PTTSl takes control of the other stages of the change. Summing up, a communication link first established is changed to a second communication link under the control of at least one radio communication terminal participating in the communication link and / or at least one control unit participating in the first communication link. communication of the radio network of the radio communication system, in which the activation of the second communication link is still carried out during the existence of the first communication link. In this way a direct direct transmission of 1. a PTT session to a telephone link is made possible, and / or 2. a telephone link to a PTT session for the user of the participating radio communication terminal. Here, in principle, it is necessary to differentiate between two solution variants: A - a solution controlled by the participating terminals and B - a solution controlled by the network. 1. Transfer of a PTT session to a telephone link: In a first departure situation there is already a PTT session between two radio communication terminals such as UEl, UE2 in figure 1, this means that there is already a processing of signals as well as useful data to IP base between both terminals of radio communication. The users of both radio communication terminals now wish to make the most continuous possible change of the PTT session to a normal telephone link in the PSTNC domain (Public Switched Telephone Network Domain - circuit switched); this is in the public switched telephone network domain, switched over the line.
Í.A Solution controlled by the participating terminals "Solution controlled by the participating terminals (UE - User equipment)" means that the radio communication terminal that initiates the change also has and retains control over the change. This is in the following embodiments always the first radio communication terminal UEl (see figure 1. Starting from the basic principle this first radio communication terminal UEl independent of the PTT session forms a telephone link through the PSTN network -CS (Public Switched Telephone Network Domain -circuit switched), this is in the public switched telephone network domain, switched through the line, with the second radio communication terminal UE2.The second radio communication terminal can take this call either automatically or notify its user in a selective manner, for example the desire to change the user of the first radio communication terminal to the user of the second radio communication terminal can be performed optically or acoustically. the user of the second radio communication terminal is shown by means of the identification parameter Pl, which the call belongs to a PC PTT session in progress and is not another call unrelated to the PC PTT session. After the telephone link has been formed, all voice data is transmitted instead of through the IP-based PTT session, now through the telephone link based on PSTN-CS. The PTT session can then be immediately terminated, for example, by the first communication terminal EU1 or only after a certain period of time, for example after 5 minutes, however it can alternatively be maintained in parallel for such a long time until the communication ends. between the radio communication terminals UEl, UE2. By means of parallel conservation of the PTT session with the simultaneous telephone link between both radio communication terminals, the change from telephone link to PTT session can be carried out quickly at each moment, that is, it can be switched flexibly to one side and towards the other without requiring a new conformation of the desired communication link. 1. B network-controlled solution: "Network-controlled solution" means that the PTT server such as PTTSl in Figure 1, works in a PTT session, has control over the changes and not a radio communication terminal participant as in the embodiment variant Í.A. For this solution controlled with the network, the radio communication terminal such as UEl, sends signals indicating that it wants a change from a PTT session to a telephone link, that desire for change transmits it by means of a notification signal as for example IS2 (see figure 1) and IS2 * to the PTT server as for example PTTSl in figure 1. The PTT server then indicates to the control unit MSC1 responsible for the first radio communication terminal UEl in the PSTN-CS domain by means of a control signal, such as SM1, for example, that a telephone link must be established between the first and second radio communication terminals UEl, UE2. For this purpose, the radio communication terminals UEl, UE2 must take the incoming call in a particularly automatic manner.
Alternatively, the call can be made after the active confirmation by the user of the radio communication terminal in question. As soon as the telephone link is established, all voice data is transported over a PSTN-CN-based telephone link instead of an IP-based PTT session. Eventually, the switching unit responsible for the telephone link, such as here, MSC1, indicates to the PTT server that the telephone link was established successfully. As in example l.A, the PTT session may be terminated immediately by the PTT server PTTSl. 2. Transfer of a telephone link to a PTT session: In a second initial situation, a normal telephone link is now established in the PSTN-CS domain between both radio communication terminals UEl, UE2. Both users of the radio communication terminals wish to pass in as continuous a manner as possible from that telephone link to an IP-based PTT session. 2.A Solution controlled by the participating terminals: Here again one of the radio communication terminals participating in the telephone link has control over the change. This in the present case is the first UEl radio communication terminal. Parallelly 1 existing telephone link TC this radio communication terminal UEl that has initiated the change, establishes a PC PTT session. As soon as the PTT session is active, all voice data is transmitted through the PTT session instead of through the telephone link. The telephone link is then concluded by the first radio communication terminal UEl or is held in parallel for the desired period of time. 2. B Network-controlled solution: Here the control unit of the radio network that is responsible for the telephone link has control over the change to the PTT session. That network side control unit is preferably formed by the switching unit for example MSC1 (see figure 1), which is assigned to the radio communication terminal such as UE2, which has the desire to change. The radio communication terminal UEl indicates to its switching unit MSC1 assigned by the network, with the help of an IS5 notification signal, that in figure 3 it is indicated with dotted lines, that a change to a PTT session is desired. PC The switching unit MSC1 then indicates the PTT server for example with the help of the control signal MSI, which wants to establish a PTT session between both radio communication terminals UEl, UE2. The PTT server PTTSl then starts the corresponding activities. In particular, it sends to both radio communication terminals UEl, UE2 corresponding request signals on whether the radio communication terminals UEl, UE2 can automatically accept the PTT session in particular. Those request signals PTT server are omitted in Figure 3 for reasons of clarity in the drawing. In particular, the user of the receiving radio communication terminal can also confirm the request signal for the establishment of the PTT session, actively by transmitting a corresponding response signal to the PTT server. As soon as the PTT session is established, all voice data is now transmitted through the PTT session instead of through the telephone link. Preferably, the PTT server indicates to the switching unit MSC1 that the PTT session has been successfully established. The telephone link may eventually be terminated by the switching unit MSC1, or it may be maintained in parallel, its has not yet been completely excluded a subsequent rapid change to the telephone link by the user. The control unit on the network side, which has control over the change to the PTT session, is alternatively formed by the PTT server PTTSl assigned to the radio communication device UEl. The radio communication terminal UEl indicates its assigned PTT server PTTSl of the network, with the help of a control signal or MSI * notification, which in figure 3 is indicated with dashed lines that a change of the telephone link switched through the existing TC line to a PC PTT session. From this the PTT server PTTSl begins with the activities, whose course was already explained in the previous paragraph. Since still during a first communication link already formed between at least two participating radio communication terminals, the activation of a second communication link is performed, the users of the "PTT" and "telephony" services without great problems and without interrupting the communication they can change between both services. So depending on the momentary communication requirements and the current communication status of those services, that are considered as more suitable or advantageous by the user. An advantage of the solution controlled by the participating terminals is in particular that expensive or additional functionalities in the radio network are not required for its realization. An advantage of the network-controlled embodiment is in particular that the network elements presenting the logic of a service also control resources and costs, this means, for example, that the switching units MSC1, MSC2 as well as the PTT PTT server, also has technical control over a service change. In this variant it is even possible that the service change be initiated by the network. Then it is not necessary that the communication devices are additionally provided with complicated control means. It is also possible to use the existing radio communication terminals. So that the change of the first type of communication link to the second type of communication link can be carried out without problems, this is continuously uninterrupted, in the case of the solution controlled by the participating terminal preferably in the radio communication terminal participating in In this case, the identity of the user, such as the telephone number and / or the SIP address, is transferred from one application, for example PTT to the other, for example telephony. It is also advantageous to extend the signaling to the notification of the desire to change in the case of an additional establishment of the telephone link or the PTT session, in such a way that the radio communication terminal in question would have the caller automatically accept the call. call. A communication link is then additionally made in parallel to the existing communication link without the user's participation on the opposite side. Since during the establishment of the second type of communication link, the relationship with the first type of communication link can be determined, with the signaling, an identification parameter such as Til of the first communication link is additionally identified in an advantageous manner. existing. It is sent in the control signal of the radio communication terminal in question that the change is desired or in the control signal of the control unit, which is responsible for the network side of the already existing communication link. In the case of the solution controlled by the network, the radio communication terminal which wishes to change, for example UEl, transmits a corresponding notification signal to the switching unit such as MSC1, which is responsible for it, when desired a change of the PTT session to the telephone link, as well as the PTT server such as PTTSl, when a change of the telephone link to the PTT session is desired. In a request signal of this type, the switching unit, such as MSC1, in the case of the desire to change the packet-switched PTT session to the telephone link switched through the line, transmits a control signal such as MSI to the control unit in question as here the PTT server PTTSl, which is responsible for the telephone link switched through the line. By switching from the packet-switched PTT session to the switched telephone link through the line the PTT server such as PTTSl transmits at least one control signal such as SMl to the control unit in the radio network, which is responsible of the telephone link switched through the line. This control unit is formed in particular by means of that switching unit such as MSCl, which is responsible for the communication terminal by. radio in question that causes the switch from the packet-switched PTT session to the switched telephone link through the line- To confirm the successful establishment of a call or of a 'PTT session, it may eventually be advantageous, that the sent notification or control signal is confirmed in the opposite direction by means of a response signal. In practice, the following implementation variants can be advantageously implemented in particular: Example 1 solution controlled by the participating terminal of Í.A: A PTT session is started between both radio communication terminals UEl, UE2, whose link formed to through the PTT server PTTSl is designated with PC in figure 1. Already the communication between the users of both radio communication terminals UEl, UE2, becomes a discussion, they want to change from a PTT PC session to a telephone link TC normal corresponding to Figure 2. For this in the PTT menu of the radio communication terminals in question, the function "change to telephony" is offered, which here in the example of embodiment, selects the user of the first terminal of radio communication UEl. From this within the first communication terminal by radio UEl whose PTT application (for example a PTT client) calls the telephony application for example with the telephone number of its partner PTT, this is here with the telephone number of the second radio communication terminal UE2, as transmission parameter. The first radio communication terminal UEl initiates a call request ISl to the switched part through the radio network line of the radio network, which is responsible for the formation of the telephone links. This is designated as PSTN-CS domain. The call request IS1 enters the second radio communication device and this is indicated to the user in the corresponding manner. The user of the second radio communication device can then find out, for example, by means of a ringing tone, that it is desired to change the PTT service to the normal telephone link by the first radio communication terminal- When the user of the second radio communication terminal UE2
'accepts the call IS1, for which it for example transmits a confirmation signal or RISI response to the first radio communication terminal via the switching units MSC1, MSC2, then on the first radio communication terminal UEl the application Telephony gives the answer to the PPT application, that a telephony link has been successfully established. This state is represented in Figure 2. There is designated a telephone link with TC. It is maintained in parallel or in addition to the PTT session between both radio communication terminals UEl, UE2. After that telephone link TC has been established between both radio communication terminals UEl, UE2, then all voice data is transmitted by that telephone link TS in the PSTN-C domain in both transmission directions, and this is independently whether a user has recently activated or not the PTT key on his radio communication terminal UEl. In other words, this means that the voice link through the PTT server PTTSl of FIG. 2 no longer exists, that only the communication link exists through the switching units responsible for the network MSC1, MSC2. The PTT application in the first radio communication terminal UEl, from which the desire to change, could then terminate the PTT PC session immediately or after an adjustable period of time. For this, the SIP message "BYE" sends the PTT server in charge. This state is shown in Figure 3, where only one telephone link TC remains between both radio communication terminals UEl, UE2. Alternatively, it may optionally be advantageous to maintain the PTT PC session in parallel to the telephone link TC, so as to be able to quickly make a desired later change back to the PC PTT session. This is for example advantageous when a discussion between the users of both radio communication terminals UEl, UE2 has been terminated and once again only isolated voice messages will be transmitted sporadically. In order to obtain a change of service without interruptions in the communication between both radio communication terminals UE1, UE2, it can be advantageous in particular that the second radio communication terminal UE2 is not informed with the tone about the IS1 call and neither needs take that IS1 flame. For this it is advantageous that in the case of the request of the first radio communication terminal UEl UEl, a characterization parameter is included, especially the so-called FLAG-flag. "automatically take the call" or "the PTT session automatically takes the call" in the confirmation signal IS1, in such a way that the second radio communication terminal UE2 due to that characterization parameter automatically takes the call. Alternatively or additionally the second radio communication terminal UE2 in the case of a call request can verify via the confirmation signal IS1, if the same subscriber, this is his associated telephone number is already active in a PTT session. Only when this is the case, the call will be taken automatically. Alternatively or additionally to this, an identification parameter such as Pl, which clearly identifies the active PTT session, may be included in the call request, so that the newly-formed switched telephone line can be clearly assigned. to the existing PTT session. Example 2 Controlled soldering by the participating terminals Í.A: Alternatively to the formation of the telephone call at the beginning of example 1, it is also possible that after the activation of the "switch to telephony" function in the first radio communication terminal A so-called SIP message (session initiation protocol) is sent to the PTT server PTTSl, which then transmits a corresponding SIP PTSSl message to the second radio communication terminal UE2. This confirmation signal is further shown in Figure 1 with dotted lines and is designated as IS2. Included in this SIP message is a request to switch to a telephone link in the PSTN-CS domain. SIP messages, which can be used for this are for example "re-invite" or "info", in which a new Header has been introduced, this is a new heading, such as "application change: CS-Telephony" and / or in which a corresponding SDP (session description protocol) message or a message is included in the data section or body of the SIP message, it may be advantageous if the first radio communication terminal UEl includes its telephone number PN1 in the message SIP IS2. As a positive response to that notification signal IS2, the second radio communication terminal UE2 can transmit a SIP message RIS2 to the first radio communication terminal UEl. Here, it can be advantageous if the second radio communication terminal UE2 in its telephone number PN2 includes its telephone number PN2 in the answer or confirmation signal UIS2. With this there are two alternatives to establish a telephone link between both radio communication terminals UEl, UE2. These are represented schematically in FIGS. 4 and 5. In the first variant of FIG. 4, the radio communication terminal UEl transmits the notification signal IS2 with the intermediate switching through the PTT server PTTSl to the second communication terminal via radio UE2. It accepts the call request and transmits a confirmation signal RIS2 indicating its telephone number PN2 to the first radio communication terminal UEl through the PTT server. PTTSl. After obtaining the confirmation signal RIS2 with the name "2000 OKAY (PN2)" the first radio communication terminal UEl starts after the call establishment with an STC procedure, as it now knows the telephone number PN2 of its partner in The conference. Here UE2 transmits the telephone number PN2 of the second radio communication terminal UE2 to the switching unit MSC1 responsible for the network as an address parameter. In a variant according to FIG. 5, the first radio communication terminal UEl, whose user has the desire to change to a telephone link TC, transmits in the notification signal IS2, his telephone number to the second radio communication terminal. UE2. Here, the IS2 notification signal is also transmitted via the signaling and / or existing data links of the already established PTT session. This is shown in Figure 5, since the PTT server PTTSl is drawn there between the interfaces of both radio communication terminals UEl, UE2 by means of a dotted rectangle with the corresponding interface lines. As a reply. to the notification signal IS2, the second radio communication terminal UE2 transmits the RIS2 response signal without indicating its telephone number, to the first radio communication terminal UEl with the intermediate switching of the PTT server PTTSl. Then the second radio communication terminal UEl begins the establishment of a call by activating the STC procedure. Contrary to the variant of FIG. 4, the second radio communication terminal UE2 here establishes the call instead of the first radio communication terminal UEl. For this, it transmits to its responsible switching unit MSC2 the call number PNl transmitted in the notification signal IS2 of the first radio communication terminal UEl. The telephone number PN2 or PNl included in the SIP message, such as RIS2 of FIG. 4 as well as IS2 of FIG. 5, may optionally be necessary for the receiver of the SIP message to establish the call. So since the signaling of the PTT session is based on SIP, it may be the case that the radio communication terminal, which has the desire to switch to the telephone link, does not know the telephone number of the other devices participating in the communication by radio. For a PTT session an address to the user can be sufficient through the SIP addresses and not through the telephone number. In this example 2, the automatic acceptance of the call by the receiver can advantageously be performed., since the receiving subscriber due to the previous SIP signaling, knows that the call request belongs to the desired change of the PTT session to the telephone link. For this purpose, an identification parameter such as Pl may optionally be included in the call request. Example 3 on the solution controlled by the network of L.B: Also here the user of the first radio communication terminal UEl activates the "switch to telephony" function in a PTT menu. After this, it signals the first radio communication terminal UEl of the PTT server PTTSl, which wishes to change the service from PTT to telephony. For this, it transmits a notification signal IS2 * (see figure 1) indicating its own telephone number as well as the telephone number PN2 of the second radio communication terminal UE2 participating in the PTTSl server. For this IS2 * notification signal, the SIP format is preferably used. In the interface diagram of figure 6 that message • has the name "1: INFO (PNl, PN2)". In order to be able to indicate to the second radio communication terminal UE "the desire to change from PTT to telephony, it may be advantageous to include a corresponding header in the notification signal IS2, for example with the name" application change: CS- telephony " and / or a corresponding SDP (Session Description Protocol) message in the body of the SIP message After the first radio communication terminal UEl has received a conformation signal RIS2 * from the PTT server PTTSl in response to the signal of IS2 * request, the PTT server PTTSl indicates in the packet switched domain, that is in the Packet Switched Domain of the switching unit MSC1, which in the PSCN / CS domain is responsible for the first radio communication terminal UEl of the radio network, that there is a desire to change to a telephone link between both radio communication terminals UEl, UE2 by the first radio communication terminal UEl. this sends a notification signal R2 to the CSCF component CSCF1 (see figure 1), which sends a notification signal R3 under the intermediate switching of a BGCF component (breakout control function - Breakout Gateway Control Function) BGCFl to the component of MCCF MGCF1. This in turn transmits a notification signal R4 to the SGW component SGW1, which includes a notification signal SU5 with the name "5: preparation (PM1, PM2)" to the switching unit MSC1. The individual notification signals R2, R3, 45 as well as SU5 generally act as a control signal. This is shown in FIG. 6 additionally by dotted lines and is designated SMl. It includes the telephone numbers PNl, PN2 as address parameters. That transmission of one or more address parameters of at least one radio communication terminal participating in the PTT session by means of at least one control signal to the control unit, which is responsible for the switched telephone link by means of the line , is shown in detail in figure 7. After obtaining the notification signal IS2 * about the desire for change by the radio communication terminal UEl transmits the PTT server PTTSl the control signal SMl indicating the telephone numbers PNl, PN2 of both radio communication terminals UEl, UE2 through the CSCF component (Cali State Control Function) - CSCF1, the MGCF component (Media Gateway Control Function - Media Input Control Function) MGCF1 as well as the SGW (Signaling Gateway) SGW1 component to the MSCl switching unit as the control unit of the telephone link Only for the telephone link switched through the line. With the help of the message signal chain R6, R7, R8 through the individual components SGW1, MGCF1, CSCF1, the PTT server PTTsl is confirmed, that the request to establish a conference was received in the switching unit MSC1. The BGCF component BGCF1 has the function of determining the MGCF components MGCF1 responsible for the components of CSCF CSCF1 whose functionality is not taken into account here in the context of the invention. The components of MGCF MGCF1 are responsible especially for Interworking, this is the collaboration between the PS domain and the PSTN / CS domain. The components of SGW SGWl have in particular the function of linking the signaling network based on SCFP / IP (Simple Control Frame Protocol / Internet Protocol) in the PS domain and the signaling network SS7 in the PSTN / CS domain. Other features are found in the specification 3GPP TS 23.228 V5.ll "IP Multimedia Subsystem (IMS); step 2. "The switching unit MSC1 now with its" network initiated call "function can establish a telephone link between both radio communication terminals UEl, UE2.This procedure is indicated in particular in part 5.2.3 of Detailed Specification of 3GPP TS 24.008 V5.10"Mobile radio interface layes 4 specification; Core network protocols; Stage 3. "Activation of the call setup by the switching unit MSC1 is designated STC in FIG. 6. The switching unit MSC1 initiates with this STC activation procedure a call request on the second radio communication terminal UE2 with the intermediate switching of its switching unit MSC2 This signaling of the switching unit MSC2 of the receiving side is omitted in figure 6 for reasons of clarity The second radio communication terminal can accept the call automatically without a confirmation explicitly by the user of the second radio communication terminal, as long as the telephone link is established, all voice data is transmitted in both directions through the telephone link in the PSTN / CS domain, regardless of whether the user the radio communication terminals UEl, UE2 participant have already activated the PTT key or not. switching MSC1 indicates the PTT server PTTSl with the help of the confirmation signals ES9, N10, Nll,
N12 with the participation of SGWl components,
MGCF1, CSFC1, that the telephone link has been established in a successful manner. This is confirmed by the PTT server PTTSl by means of the retransmission of 1 chain of confirmation signals R13, R14, R15 to the components of SGW SGWl. The PTT server PTTSl finally reports with the help of an IF16 answer signal to the first radio communication terminal UEl, that request to change from PTT to telephony was successfully performed. To this confirmation signal IF16 the radio communication terminal UEl answers with a RIF16 response signal to the PTT server PTTSl. The PTT server then immediately after a predetermined period of time can conclude the PTT session, for which it sends a SIP message with the name "BYE" to the radio communication terminals UEl, UE2. In order to make a quick subsequent change back to the PTT session, the PTT session may eventually eventually remain parallel to the telephone link. Example 4 on the solution controlled by the participating terminals 2.A:
The signal flow of that variant embodiment is similar to Example 1, only now the change goes in the opposite direction, in fact from a telephone link to a PTT session. The starting point is here a telephone link between both radio communication terminals UEl, UE2, as shown in figure 3. Since the communication between the users of both radio communication terminals is only carried out sporadically, they want to change from the TC telephone link to the PTT PC session. This is displayed in the telephone menu of the radio communication terminal in question, "change to PTT session" is offered. In this embodiment, the user of the first radio communication terminal UEl selects that point from the menu. After this in the radio communication terminal UEl the telephony application requests the application of PTT, for example a PTT client in particular with the telephone number PN2 of the telephone partner, ie the telephone number of the second communication terminal per radio UE2, as a transmission parameter. This starts a PTT request in the packet switched domain through the "IP multimedia subsystem" (IMS) for example with an invitation message in a known manner. For this, with the help of the control ST2 of the second radio communication terminal UE2, an IS6 notification signal is sent to the corresponding components in the packet-switched network domain. This notification signal IS6 is shown in figure 3 with dotted lines. When the PTT session has been established the PTT application responds to the telephony application, that PTT session has been successfully established. The establishment and development of the PTT session is controlled here especially by the PTT server PTTSl. After the successful establishment of the PTT session, then the UEl radio communication terminal that originally desired the change concludes or withdraws the telephone link. From now on the voice data is now transmitted only through the PTT session in the PS domain, when a user has activated the PTT key, this is still active PTT session. Example 5 on the solution controlled by the participating terminal 2.A: Contrary to example 4 here the PTT session is performed in parallel to the newly established telephone link, that is, it is maintained simultaneously. Then you can alternate between both services - almost continuously, this is without interruptions. When, for example, the telephone link between the subscribers of both radio communication terminals UE1, UE2 is active for communication and now it is desired to change to the PTT application, then the telephone application informs the PTT application that the last transmission should be resumed. voice. According to the positive confirmation of the application
PTT to the telephone application concludes the telephone application the telephone link. Contrary to Example 4, it is not required here to re-establish a PTT session, but can again actively use the PTT session held in parallel again in a simple manner. Example 6 on the solution controlled by the network of
2. B: This variant embodiment corresponds to the procedure of example 3, however with the difference that the change in example 6 is made in the opposite direction, in fact from a telephone link to a PTT session. The starting point here is the telephone link TC between both radio communication terminals UEl, UE2, as shown in FIG. 3. Here also the user of the first radio communication terminal UEl activates the function "Change to the session PTT "in your phone menu. The subsequent signal flow between the first radio communication terminal UEl and the participating network components is shown in figure 9. The first radio communication terminal UEl signals its responsible switching unit MSC1 with the help of a signal from control or avio IS1, that a change of telephony to PTT is desired. Both telephone numbers PNl, PN2 of both radio communication terminals UEl, UE2 are simultaneously contained in this notification signal IS1. That notification signal IS1 has in figure 8 the designation "1: Switch to PTT (PN1, PN2)". The switching unit MSC1 informs the SGW component SGWl with the aid of a notification signal SU2 about the desire to change the first radio communication terminal UEl. This SGW component SGWl thus transmits an RF3 notification signal to the MGCF component MGCF1, which again informs the CSCF1 component with the help of an RF4 information signal. The CSCF component CSCFl finely transmits an RF5 notification signal to the PPT PTTSl server, with those two telephone numbers PNl, PN2 being communicated. In this way, the switching unit MSC1 transmits one or two address parameters by means of a radio communication terminal participating in a telephone link switched through the line with at least one control signal to the control unit which is responsible for the control unit. the PTT session. This control signal is formed here in the exemplary embodiment by means of the chain of individual signals
SU2, RF4, RF5. Additionally in figure 8 it is shown with a dotted line and s the MSI reference. In the control signal MSI, an identification parameter TI is advantageously introduced by means of a switching unit MSC1, which characterizes the already existing telephone link TC and only now allows an assignment to the PTT session, in such a way that confusion is avoided with other PTT sessions or other telephone links. The notification signal ISl is confirmed by the switching unit MSC1 by means of a confirmation signal RISl * to the first radio communication terminal UEl. The reception of the control signal MSI is confirmed by the PTT server PTTSl by means of an RF6 response signal to the CSCF component CSCFl. This sends a confirmation signal RF7 to the MGCF component MGCF1, which in turn sends a confirmation signal RF8 in the SGW SGW1 component. Thanks to this control signal MSI then the PTT server establishes a PTT session between both radio communication terminals UEl, UE2. That activation of the PTT session is designated as SPTT in Figure 8. As soon as that PTT session is established, the voice data is transmitted through the PTT session in the PS domain only in one direction. Authorized to speak is then only that user who in his terminal of communication by radio remains in that moment the active PTT key. The PTT server PTTSl informs the second radio communication terminal UE2 by means of the domain network components of the PS domain with the help of an IS7 information signal. The second radio communication terminal can then automatically accept that IS7 request signal. It can also be advantageous to notify the user of the second radio communication terminal UE2 of the desire to change the first radio communication terminal UEl., especially acoustically or optically. The user can then decide autonomously if he wants to accept or not the desire to change. If the second radio communication terminal UE2 accepts the desire to change the first radio communication terminal UEl and communicates it with the help of an IS8 confirmation signal to the PTT server PTTSl, thus activates this PTT session with the SPTT procedure . When the PTT server PTTSl has successfully established the POTT session, it signals it by means of a confirmation signal N09 of the component CSCF CSCFl, this is obtained with the aid of a conformation signal NO10 to the component MGCFl. This informs corresponding by means of a confirmation signal NOll to the SGW component SGWl, which transmits this confirmation by means of a confirmation signal SU12 to the switching unit MSCl. Eventually the switching unit MSCl informs the first radio communication terminal UEl with a confirmation signal SW16 that the desire to change telephony to PTT has been successfully realized. Thereafter, the radio communication terminal UEl transmits a confirmation signal BSW16 to the switching unit MSC1. The confirmation signals NO09, NO10, NOll, SU12 can be confirmed by means of temporarily sequential response signals RN012, RN013, RN015, RSU15. After switching to the PTT service, the switching unit MSC1 can cut the telephone link TC. Alternatively, it is also possible to maintain the telephone link for a predetermined period of time. Example 7 on the solution controlled by a network of
2. B: The starting point here is again a telephone link TC between both radio communication terminals UEl, UE2, as shown in figure 3. Also here the user of the first radio communication terminal UEl activates the function "Switch to PTT session" in your phone menu. The first radio communication terminal UEl sends to its PTT server with the help of an MSI * notification signal, that a change of telephony service to PTT is desired. In this notification signal MSI * both telephone numbers PNl, PN2 of both radio communication terminals UEl, UE2 and an identification parameter ID, which characterizes or identifies or marks the switched telephone link through the existing line, are simultaneously contained. . After this, the PTT server establishes a PTT session between both radio communication terminals UEl, UE2. As soon as the PTT session is formed, the voice data is transmitted through the PTT session in the PS domain in only one direction. Authorized to speak is only the user who keeps the PTT key activated on their radio communication terminal. When the PTT server PTTSl has successfully established the PTT session, it is indicated via CSCFl, MGCFl and GSW1 to the switching unit MSC1. Eventually, the switching unit MSC1 informs the first radio communication terminal UEl that the desire to change telephony to PTT was successfully carried out. Thereafter, the radio communication terminal UEl sends a confirmation signal to the switching unit MSC1. After modifying the PTT service, the switching unit MSC1 can cut the telephone link TC. Alternatively, it is also possible to maintain the telephone link for a predetermined period of time. In this way it is easily possible for the conference partner to switch over and over between a normal telephone link and the PTT service. For this there are two variants of realization: One is that both terminals of communication by radio regulate the establishment of conferences to change the desired mode among themselves, without intervention of the network components. While the participants in the conference still speak through an established communication link. first, in parallel, the second desired communication link is established. The radio communication terminals are unified when they are switched. The advantage here is that mainly control means or control applications are implemented in the participating radio communication terminals, while existing network components can be used.
This means that modifications are continually avoided in the network. The other variant is that the network produces and controls the change by means of the activation of the keys by the user. Here it is advantageous that the resources of the cattle are optimally utilized. The change is thus more convenient. The operator can also charge additional money. In any case, the network components and the participating radio communication terminals exchange the corresponding control signals and the notification signals with each other to make the change. For this an adaptation is advantageous as regards the standardization of the interfaces between the components of the network and the terminals of
Claims (14)
- radio communication. NOVELTY OF THE INVENTION Having described the invention as above, the content of the following is claimed as property: CLAIMS 1. A procedure for switching between a packet switched PTT (PC) session and a switched telephone link through the line (TC ) as selectable communication links between at least one first radio communication terminal (UEl) and at least one second radio communication terminal (UE2) participating in a radio communication system (FC), characterized in that the first of these two communication links (PC, TC) is selected and established by means of at least one radio communication terminal (UEl) and / or by at least one control unit (PTTSl) of the communication system radio network. radio (FC), and because it is switched from that first communication link (PC) already established, to the second communication link (TC) under the control of a communication terminal by radio (UEl) participant in the communication link (PC) and / or the control unit (PTTSl) participating in the first communication link is changed (PC) of the radio network of the radio communication system, for which the activation of the second communication link (TC) is still performed during the existence of the first communication link (PC).
- 2. The method according to Figure 1, characterized in that the first radio communication terminal (UEl) to the second radio communication terminal (UE2) through a first communication link '(PC) already established, at least one control signal (IS2) is transmitted, with which the second radio communication terminal (UE2) communicates to the second radio communication terminal (UEl) of changing a first communication link and established (PC) to a second communication link (TC).
- The method according to one of the preceding claims, characterized in that the communication link (PC) the first and / or second radio communication terminals (UEl), to the control unit (PTTSl) which is responsible for the first communication link established (PC), transmits at least one control signal (IS2 *), with which this control unit (PTTSl) communicates the desire of the first and / or the second communication terminal (UEl), to switch from a first communication link (PC) to a second communication link (TC).
- The method according to one of the preceding claims, characterized in that the communication link (PC) the first and / or second radio communication terminals (UEl), to the control unit (PTTSl) which is responsible for the second communication link established (TC), transmits at least one control signal (IS1), with which this control unit (PTTSl) communicates the desire of the first and / or the second communication terminal (UEl), to switch from a first communication link (PC) to a second communication link (TC).
- The method according to one of the preceding claims, characterized in that the first communication link already established by the control unit (PTTSl) transmits the control signal (SMl) about the switching desire of the radio communication terminal (UEl) first or second, to that control unit (MSC1) that is responsible for activating and establishing the second communication link (TC).
- 6. The method according to one of claims 2 to 5, characterized in that one or more address parameters (PNl, PN2) of the radio communication terminal (UE2) participating in the first one are included in the control signal (IS2). communication link, to which the switching desire is sent, and / or of the radio communication terminal (UEl) participating in the first radio link, from which the switching desire arises, and / or at least an identification parameter (Pl) for identifying the communication link (PC) already established for the second communication link (TC) to be established 7.
- The method according to claim 6, characterized in that with the help of the parameter of identification (Pl) in the signal(IS2) of the first communication link (PC) already established, is assigned to the second communication link (TC) that is still to be established, in such a way that a clear link between the first communication link (PC) and established and the second communication link (TC) desired.
- The method according to one of the preceding claims, characterized in that the first communication link (PC) already established is disabled and ends after activating the second communication link (TC).
- The method according to one of claims 1 to 7, characterized in that the second communication link (TC) after its activation is established and maintained in parallel to the first communication link (PC) already established.
- The method according to one of the preceding claims, characterized in that a -PTT server is used as the control unit (PTTSl) for the packet switched PTT (PC) session.
- The method according to one of the preceding claims, characterized in that a switching unit MSC is used as the control unit (MSC1) for the line-switched telephone line (TC).
- 12. A radio communication terminal (UEl, UE2) characterized in that it has a control unit (ST1) for carrying out the method according to one of claims 1 to 11.
- 13. A network component (PTTS1, MSC1) characterized because it presents a control unit (SVS) for carrying out the method according to one of claims 1 to 11.
- 14. Radio communication system (FC) characterized in that it has a first group (Gl) of network components to select and produce a packet switched PTT (PC) session as well as a second group (G2) of network components to select and produce a telephone link switched through the line (TC) as selectable communication links between at least one first participating radio communication terminal (UEl) and at least one second participating radio communication terminal (UE2) of a communication system by radio (FC), both groups of network components presenting control means for carrying out the method according to one of claims 1 to 11.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004007216.7 | 2004-02-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA06009213A true MXPA06009213A (en) | 2007-04-10 |
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