WO2008012264A1

WO2008012264A1 - Method for transmitting data in a radio communications system

Info

Publication number: WO2008012264A1
Application number: PCT/EP2007/057471
Authority: WO
Inventors: Rudolf Schrenk
Original assignee: Nokia Siemens Networks Gmbh & Co. Kg
Priority date: 2006-07-25
Filing date: 2007-07-19
Publication date: 2008-01-31
Also published as: DE102006034421A1

Abstract

According to the invention, a method for transmitting data in a radio communications system is disclosed, in which in the region of the at least one radio cell (Z2) of the station, at least one physical group call channel (GC Ch) for the transmission of data of a group call connection service is set up and/or seized by at least one second base station (BS2) of the radio communications system, wherein the setup and/or the seizure of the group call channel (GG Ch) takes place depending on whether at least one terminal device (MS) is located in the region of a radio cell (Z1) of at least one base station (BS2) adjacent to the first base station (BS1).

Description

description

Method for transmitting data in a radio communication system

The invention relates to a method for transmitting data in a radio communication system.

Mobile radio systems based on e.g. the GSM (Global System for Mobile Communications) standard.

There are also other standards, such as UMTS (Universal Mobile Telecommunication System). With a view to introducing a single communication system, it was decided in 1993 in the International Union of Railway Administrations (UIC, Union Internationale des Chemins de Fer) to implement a system using a modified GSM 900 technology. This system, known as GSM-R (Global System for Mobile Communications for Railway), was specified by the ETSI (European Telecommunications Standards Institute) in 1999 and by EIRENE (European Integrated Railway Radio Enhanced Network) in 2000 as the standard.

In particular, the GSM system enables both voice and data connections over circuit-switched data services up to a data rate of 14.4 kbit / s. In addition, special services have been introduced as GSM connection methods. One of these services is available as an emergency call, group and broadcast connection service for distributing information among several subscribers of the GSM network.

In particular, in a typical scenario, under the name GSM-BOS (GSM for authorities, organizations and security services) or GSM PMR (Engl. GSM Private Mobile Radio) is a so-called Sprachgruppenrufverbindungsdienst VGCS used (Voice Group Cail Service) having a Übertra ^¬ tion of voice data between participants of a group according to a so-called push-to-talk functionality he ^¬ allows. For example, the technical specification cation 3GPP TS 03.68 V8.6.0 (2005-06), 3rd Generation Partnership Project; Technical Specification Group Core Network and Terminals; Voice Group Calling Service (VGCS); Stage 2 (Re ^¬ lease 1999), referenced. In addition, there is also the so-called voice broadcast service VBS (Voice Broadcast Service), by means of which voice data can be transmitted to a group of users starting from a subscriber.

Typically, group call services for a large ^geographic area are composed of a plurality of group call areas, each consisting of a plurality of radio cells. In this multitude of radio cells of the group call area, however, usually only a small number of group call members move at a more or less high speed. During an incoming Sprachgrup ^¬ penrufs, in which data in the form of voice data to the group call subscribers or their terminals to be transmitted, thereby most of the radio cells are empty, ie, there are currently no active receiving or transmitting terminals in the corresponding radio cell. Although the group call channel is thus unused in such an empty radio cell, it is nevertheless allocated, ie set up and allocated.

To avoid such an assignment of radio resources are not used, a imple ^¬ mentation of a so-called ULR procedure (UpLink Reply pro- cedure / German: uplink response procedure) is being considered. During an incoming voice group call, the ULR procedure, if enabled, runs from one

Timers controlled and periodically in each base station of the group call areas. The result of the procedure is either the value 1 if at least one terminal accesses the multicast channel, or the value 0 if no terminal accesses after a lapse of the time set by the timer. If no terminal accesses, the ULR deallocates the group call channel of those cells that are currently empty, ie those cells in which there are currently no accessing terminals.

A disadvantage of this procedure is that although terminals that move in the direction of an empty cell are informed about an incoming voice group call, they do not find an established group call channel in this radio cell since it has not been assigned or has already been released again. The terminals must first indicate their presence at the base station serving the radio cell, whereupon the network must re-allocate the group call channel in the corresponding radio cell via its base station. The disadvantage of this procedure is, above all, that the speech transmission interruption can be long and can be unacceptably long for the user or subscriber of the terminal. This is especially true in the case of high priority or emergency voice group calls.

An object of the invention is to provide a method and a radio communication system or components of such a system, which allow a saving of resources in the management of a group call connection.

This object is solved by the inventive features of the independent claims. Advantageous Ausgestal ^¬ tions of the invention are the dependent claims removed.

According to the invention a method for transmitting data is provided in a radio communication system in which at least a second base station of the radio communication system in the region of its assigned at least one radio ^¬ cell at least one physical Gruppenrufkanal for a transmission of data of a Gruppenrufverbindungsdienstes constructed and / or The structure and / or assignment of the group call channel is dependent on the fact that in the area of a radio cell at least one of the two ten base station adjacent first base station at least one terminal is located.

The method according to the invention advantageously makes it possible to activate or allocate the group call channel in good time prior to the entry of a mobile station moving from a radio cell into an adjacent radio cell in the form of such a terminal.

According to a first development of the invention, the second base station sets up the group call channel in at least one radio cell which is adjacent to and / or overlaps with the radio cell of the first base station in which the at least one terminal is located. As a neighboring radio cells ^¬ particular radio cells which are arranged in direct transition region of a radio cell in which a terminal is active are considered.

According to another embodiment of the invention is the

Group call channel after or in connection with a log on of the at least one terminal via the first base station in at least one radio cell of the second base station constructed.

According to a further development of the invention, the group call channel can also be set up and / or assigned according to the fact that the at least one terminal signals or is suitable for receiving and / or transmitting data via a group call channel, such that a group call channel is not is constructed, if only these are not verwen ^¬ dende terminals in his area.

The activation of a group call channel can be caused, for example, by the fact that a terminal becomes active within a radio cell and requests a group call channel, or even signals its suitability for the use of the group call channel. In particular, the last case is advantageous because a group call channel is not established in each case, when a terminal is in the radio cell, but a multicast channel is established only when a terminal is in the area of the base station that is capable or functionally provided to use a multicast channel. Advantageously might as well Example ^¬ subscriber terminals in the emergency service, a special signaling inquiry, which signaled the need for a very special Gruppenrufkanal.

According to a further development of the invention the Gruppenrufkanal is established depending on and / or confirms that sending the at least one terminal to receive data over the Gruppenrufkanal and / or a request signaled ^¬ Siert. Resources for the group channel are thus only occupied if the terminal actually has needs and signals this. In the reverse direction is accordingly advantageous if the Gruppenrufkanal thereof positioned ^¬ builds dependent and / or it is demonstrated that in the are to send data over the at least one Gruppenrufkanal Endge advises ^¬.

According to a further embodiment of the invention is checked by a network-side control device at intervals in which radio cell of the base stations, the at least one terminal is, and depending on the structure, the occupancy or a reduction of the group call channel causes corresponding adjacent radio cells, so that a preferably always optimal access to the group channel at the same time optimized resource utilization is enabled. The time intervals for checking to this shorter than a expectable shortest residence time or set by a based thereon further development, a through ^¬-average residence time of the at least one terminal in a radio cell, so that UNNE ^¬ ge for the terminal waits for the access to the group call channel or even data losses when sending in the direction of terminals are avoided. According to a further embodiment of the invention, a spatial movement of the at least one terminal is determined, and depending on a construction and / or assignment of the group call channel causes in radio cells, which lie in the expectable possible directions of movement of the at least one terminal. This ensures, for example, for terminals moving at high speed that they also find an active group call channel there after leaving a radio cell, quickly traversing an adjacent radio cell and entering an additional radio cell still behind.

A spatial movement of the terminal is determined by a wide ^¬ ren further particular by means of signaling and / or data transmissions of the at least one terminal device via the Gruppenrufkanal. In particular, timely activation of the group call channel in further radio cells, into which the terminal could enter in the near future, is possible by means of follow-up.

According to a further development of the invention, the group call channel in the radio cell of the first base station and in the at least one radio cell of the second base station is disconnected after or in connection with a logout or failure of the terminal in the area of the first base station to release more resources as quickly as possible.

An inventive radio communication system comprises at least two base stations and at least one terminal, wherein each of the at least two base stations have a Sen ^¬ en / receiving device which are configured for establishing a physical Gruppenrufkanals for a transmission of data of a Gruppenrufverbindungsdienstes, and wherein the Terminal has a transmitting / receiving device ^¬ has, which is configured for transmitting and / or receiving data in the physical group call channel. According to the invention, a second of the at least two base stations at least one physical group call channel for transmission of data of a group call connection service is set up and / or allocated at least one of its radio cells, and the structure and / or assignment of the group call channel depends on, for example, the transmission / Receiving device or one of the base stations superordinate control device, controlled that at least one terminal is located in the region of a radio cell adjacent to the second base station first of the at least two base stations. Such a radio communication system and its components expediently each have devices for realizing the method steps according to the invention.

An inventive terminal comprises at least one Sen ^¬ en / receiver device for establishing a physical Gruppenrufkanals to a base station of a radio communication system for transmitting and / or receiving data from a Gruppenrufverbindungsdienstes, wherein the terminal is configured with means for performing a method described above.

A base station according to the invention of a radio communication ^¬ system comprises at least one transmitter / receiver device for establishing a physical Gruppenrufkanals for a transmission of data of a Gruppenrufverbindungsdienstes to / from at least one terminal, wherein the transmission / reception ^¬ device and / or a control means is arranged to Building and / or occupying the group call channel in at least one radio cell depending on the fact that at least one terminal is in the range of a radio cell of a neighboring base station. Accordingly, the base station with ^¬ stuffs is configured for performing an above beschrie ^¬ surrounded method.

The inventive method as well as the components of a radio communication system can advantageously be in different ^¬ union standards, in particular the GSM initially named Standard, which support a group call channel for transmitting data including voice data to a plurality of subscriber-side terminals or a group to be addressed associated terminals.

The invention will now be described with reference to a Ausführungsbei ^¬ game closer. Show

1 components and data transmitted between them of a radio communication system according to the GSM

Default,

2 shows the components according to FIG. 1, a terminal moving from the area of a first radio cell into the area of a second radio cell, FIG.

3 shows a flow chart of the signaling exchange between components of the radio communication system and

4 shows a schematic plan view of group cell areas in which some terminals are located, wherein radio cells labeled with letters have set up a group ^{call channel} .

1 shows by way of example a simplified structure ei ^¬ nes wireless communication system according to the known GSM standard, wherein a realization of he ^¬ inventive method in radio communication systems according to other standards, such as UMTS, in the same Wei ^¬ se is possible.

The structure of a radio communication system according to the GSM standard is composed of one or more Mobilvermittlungs- centers MSC (Mobile Switching Center) which is a Vermitt ^¬ development of so-called circuit-switched connections (CS, Circuit Switched) and a management of various functionalities of the system carry out. The mobile MSC also assumes the role of transition to the Public Switched Telephone Network (PSTN).

To the mobile switching center MSC a variety of Ba ^¬ sisstationssteuerungen BSC (Base Station Controller) are connected, in which, among other things, physical resources of the radio interface are managed. A plurality of Basisstatio- are connected to a Basisstati ^¬ onssteuerung BSC, in turn, NEN BSl, BS2, BS3, BS4 (Base Station) is connected, which may under utilization of dedicated physical resources of the radio interface to establish connections to terminals MS (Mobile Sta ^¬ tion) and trigger , Each base station BS1-BS4 supplies with the physical resources at least one geographical area, which is also referred to as a radio cell Z1, Z2, Z3, Z4. Both the base stations BSl to BS4 and the terminals MS each have Sen ^¬ en / receiving devices on for the signal transmission on the radio interface. In addition, the terminals have a user interface (MMI: Man Machine Interface) as an interface to the participants.

On the basis of the transmission shown in FIG 1 and 2 and the flow chart of FIG 3 is an exemplary implementation of a particularly preferred process will hereinafter beschrie ^¬ ben. Based on the known network structure of a GSM system of Figure 1, the individual steps and Signalisie ^¬ approximations are shown between the components of the system, but are not limited to this particular embodiment. Rather, individual processes can also in each other

Components of the system are running. In particular, a terminal is to be understood as both mobile subscriber terminals and permanently installed terminals, for example in trains or stationary buildings.

In the case of the arrangement outlined with reference to FIGS. 1 and 2, four base stations BS1-BS4 with their associated radio cells Z1-Z4 are arranged one behind the other, wherein the Partially overlap radio cells Zl - Z4. This allows light ^¬ that the terminal MS is able to communicate at a first time as shown in FIG 1 via a radio link with the first base station BSl. The terminal MS can thereby move without interrupting the access to the group call channel GC Ch in the area of the second base station BS2 or in the range of the radio cell Z2 to access via a corresponding radio interface to the group call channel GC Ch the second base station BS2 , This is sketched in FIG. 2 for a later time.

To conserve resources, the BSC controls Basisstationssteu ^¬ ereinrichtung those base stations to the first base station BSl and BS2 to neighboring base stations so that they build up a respective Gruppenrufkanal GC Ch in the range of the radio cells Cl, C2. The other base stations BS3, BS4, however, are controlled in such a way that they do not build up a group ^call channel. For the activation, the base station control device BSC can send various signaling signals sa, sp, se. A first signaling sa signa ^¬ lisiert the base station BCl that in their area an active terminal MS is located, which may require communication via the group call channel GC Ch. Either the same signaling or an alternative signaling sp can be transmitted to the second base station BS2 with the adjacent second radio cell Z2. By means of the alternative signaling sp may be notified implicitly to the second base station BS2 that it should indeed establish a Grup ^¬ penrufkanal GC Ch, incoming terminal is currently, however, only when neighboring base station BS2 for a possibly provided in its area. The white ^¬ direct base station BS3, Z3 currently no terminal is in its radio cell and is not adjacent radio ^¬ cell to a cell with a terminal can, op- nal another signaling transfer se. Via the further signaling se, this base station BS3 is notified that it does not have to provide or allocate a group ^{call channel} GC Ch. The further base station BS4, in whose radio cell Z4 there is currently no terminal and which is not an adjacent radio cell to a radio cell with a terminal, for example, currently receives no signal at all and likewise does not transmit a group call channel GC Ch.

At the later time shown in FIG. 2, the terminal MS has moved into the area of the second base station BS2, so that now the first and third radio cell Z1, Z3 of the first and third base stations BS1, BS2 adjacent radio cells C1, C3 to the second Form radio cell Z2 of the second base station BS2. Accordingly, the base station controller BSC ^¬ signals this three base stations BSl - BS3 that they must each have a four Gruppenrufkanal GC Ch activated. The fourth base station BS4 receives no signaling, so that in this no group call channel GC Ch is established.

Thus, the base station controller BSC, the activation or deactivation of the Gruppenrufkanals GC Ch in the entspre ^¬ sponding radio cells Zl - Z4 of the base stations BSl - BS4 may cause suitable exchanges the base station controller BSC to the base stations BSl - BS4 in preferably regular time intervals T test information il from ,

3 shows an exemplary signaling flow Zvi ^¬ rule the various components, ie in particular the base station controller BSC, the base stations BSl - BS4 and the exemplary terminal MS at different dates. The progressive time is shown from top to ^bottom . Initially (0), the terminal MS can access the first base station BS1 or, via the latter, the group call channel GC Ch in the first radio cell Z1 of the first base station BS1. The second base station BS2 also provides as a neighboring base station a group call channel GC Ch. 1 at a first time after the base station controller BSC sends a ^¬ Prüfsignalisierung il either individually to the individual base stations BSl - BS4 together - BS4 or as a group call to all the base stations BS. The base stations BS1 - BS4 addressed in this way send back a corresponding response check signaling il to the base station controller BSC, and by means of the reply check signaling il inform the base station controller BSC whether there is a terminal MS in its area. Subsequently, the base station controller sends

BSS in a second step 2, the corresponding signaling sa, sp for activating a group call channel GC Ch to the two first base stations BSl, BS2 and a further signaling SE to the two other base stations BS3, BS4, which should not send a group call channel.

At a third time 3, the terminal MS has moved into the area of the second base station BS2. As a result of the group call channel GC Ch already established there, the terminal MS can continue to access a suitable group call channel GC Ch.

According to a first preferred embodiment, the second base station BS2 sends a reply check signal il to the base station controller BSC to inform it of the terminal MS having entered its area. Optionally, correspondingly, the first base station BS1 can also send a signaling to the base station controller BSC in order to inform that the terminal MS has left its area. The base station controller BSC is thereby set in a position to send as soon as possible suitable Signa ^¬ lisierungen sa sp to the affected base stations so that they provide corresponding Gruppenrufkanäle GC Ch be ^¬ riding set or not. At a fourth time point 4, the group call channels GC Ch of the first three base stations BS1-BS3 are thereby allocated. In combination with such a procedure, or alternatively, the base station controller BSC can activate a test cycle at periodic intervals T, to obtain an update on existie ^¬-saving terminals MS by means of corresponding or response Prüfsignalisierungen Prüfsignalisierungen il.

4 shows a plan view of a large group cell area from a plurality of individual radio cells Z1-Z4. Empty boxes show radio cells in which a group call channel is currently not provided and is accordingly not allocated. Ge ^¬ scored cells with the signaling identification of the first signaling sa and a double border show radio cells Zl, in which there is currently at least one terminal. Correspondingly, further boxes with the ^alternative signaling sp show cells which also provide a group call channel as adjacent radio cells Z2, wherein there are no corresponding terminals in these cells.

According to a particularly preferred embodiment, it is also provided that terminals moving along a path B are tracked with respect to the trajectory traveled. In this way, a predetermination is made possible in which further radio cells Z3 could possibly move via the current radio cell Z1 and adjacent radio cells Z2 to the end device. Accordingly, not only directly be ^¬ neighboring radio cells Z2, sp are instructed in the direction to activate the Gruppenrufkanal GC Ch. In addition, further radio cells Z3 are also instructed behind such neighboring radio cells Z2 to activate a group call channel CG Ch. Moving terminals or terminal devices ^¬ te, which migrate through very small-scale radio cells, characterized get continuous access to an active GC Gruppenrufkanal Ch allows very fast.

Thus, a clever uplink response functionality is advantageously provided. The basic idea is in a Gruppenrufkanal GC Ch in a radio cell Zl - to allocate Z3, although the uplink response procedure (ULR) indicates or indicate that there is currently no end ^¬ unit in the corresponding radio cell, if zumin- least serve a radio cell of the concerned radio cell is active. This means that the neighboring radio cell Z2 is a po ^¬ tenzieller or predicted candidate for a required Gruppenrufkanal, if the listening to a Gruppenrufka ^¬ nal Gruppenrufmitglieder, particularly Sprachgrup- penrufmitglieder move. Since a terminal MS can select only neighboring cells that have been communicated through the network by broadcast information, the proposed Ver ^¬ drive, ensure that there is always a Gruppenrufkanal GC Ch when the terminal enters a new neighboring cell. Preferably, a Gruppenrufkanal is only tivated Deak ^¬ if there is no terminal in the area of this base station, in particular in the area of this radio cell and is not a terminal is located in adjacent radio cells.

If a base station operates or builds up a plurality of radio cells, optionally the plurality of radio cells of the base station can be regarded as a single radio cell for the preferred procedure or else each individual one of the radio cells of the base station can be considered individually for the preferred procedure.

Thus proposed is a group call area, which is subdivided into sub-areas with three different states. A sub-area is activated by the sum of all serving radio cells in which at least one terminal listens on a group call channel or sends or speaks data via a group call channel itself. Another subarea is the prediction area, which is composed of all adjacent cells. The third sub area is an empty area, which includes all radio cells, which are neither an active terminal having one active Endge ^¬ advises in an adjacent radio cell have. Accordingly, an incoming group call, in particular voice group call in all radio cells Zl - Z3 allocated, which belong to the first two sub-areas.

Preferably, the method and a corresponding procedure in the base station controller BSC is implemented as the base station controller BSC performs radio resource management and required Informa ^¬ functions with respect to adjacent radio cells Zl - has present BS4 - Z4 for each of the base stations BS. In principle, however, such functionality could also be implemented in other components of such a radio communication system.

In contrast to the known uplink response procedure (ULR), the base station controller BSC now not only considers the retrieval result of a base station BS1-BS4 serving a radio cell Z1-Z4. In addition, the base station controller BSC collects the results of the respective neighboring base stations BS1-BS4 and takes into account such information.

Thus, the base station controller BSC preferably takes into account, for each individual base station BS1 belonging to the group cell area, on the basis of in particular a voice group call for three states. In the first active state, the group call channel GC Ch is allocated when at least one terminal is located in the area-serving radio cell Z1, Z2. In the second prediction state of Gruppenrufkanal GC Ch is allocated when not a terminal in the serving radio cell Z2 or Zl, Z3 is, however, at least one terminal MS in one of the to be ^¬ adjacent radio cells Zl or Z2 is. In the case of the empty state, no group call channel GC Ch is allocated or, in the case of allocation, a corresponding group call channel GC Ch is released if there is no terminal in the serving and in the neighboring radio cells. State transitions, which may preferably be taken into account to update the states, occur in different cases. In particular, state transitions occur if sub- skribierte terminals move for the utilization of the Gruppenruffunktionalität of a radio cell in a Zl be ^¬ neighboring radio cell Z2, which is the normal case. Another case is a sudden activating (engl, pop up) in a radio cell of a Gruppenrufbereichs is turned on when a Endge advises ^¬ or enter the group area at a later time after the appropriate means of Gruppenrufkanälen. Yet another case is the entry of a terminal into the group call area. For a deactivation or release of a group call channel GC Ch leading events are a sudden disappearance of a terminal MS from an active cell, which can occur by a controlled off ^¬ switch or a sudden failure of a terminal or eg by leaving the group call area. Entering or leaving the group call function can also cause a switch-on or switch-off.

The states are preferably updated at regular intervals T, preferably based on current uplink response procedure results and old states. The refresh interval should preference ^¬ shorter than the shortest expected residence time of a mobile terminal within a radio cell to be.

According to a further preferred alternative or additional functionality chen in particular the base station controller BSC ^¬ tracks the movement of a subscribed subscriber or terminal. A motion profile may be recorded based on voice group calls used for purposes of logging, monitoring, and / or post-processing.

The preferred procedures offer several advantages. Maintaining multicast channels in an allocating The state in the prediction areas or neighboring radio cells minimizes the reception interruptions during a new selection of a radio cell by a terminal. Advantageously, a capacity or an otherwise wasted radio resource is made possible by the release of group call channels in all radio cells which belong to the empty areas. Also advantageous is the tracking or tracking of movement profiles of terminals that have the functionality of a group call, in particular voice group call activated.

Claims

claims

1. A method for transmitting data in a radio communication system in which at least one second base station (BS2) of the radio communication system in the region of at least one radio ^¬ cell (Z2), at least a physical Gruppenrufkanal (GC Ch) for a transmission of is data of a Gruppenrufverbin- built-making service and / or occupied, wherein the up construction and / or the occupancy of the Gruppenrufkanals (GG ch) depen carried ^¬ gig that in the region of a radio cell (Zl) at least one (to the second base station BS2) adjacent first base station (BSl) at least one terminal (MS) be ^¬ finds.

2. The method of claim 1, wherein the second base station (BS2) the Gruppenrufkanal (GC Ch) in at least one radio cell (Z2) is built, which to the radio ^¬ cell (Zl) of the first base station (BS), in which the at least one terminal (MS) is located, adjacent and / or intersects with it.

3. The method of claim 1 or 2, wherein the group call channel (GC ch) after or in connection with a log on of the at least one terminal (MS) via the first base station (BSl) in at least one radio cell (Z2) of the second base station (BS2 ) is constructed.

4. The method according to any preceding claim, in which the Gruppenrufkanal (GC Ch) set up depending on and / or confirms that the at least one terminal (MS) a Fä ^¬ ability to receive and / or transmit data via a Gruppenrufkanal (GC Ch) is signaled or suitable.

5. Method according to any preceding claim, in which the group call channel (GC Ch) is set up and / or allocated depending on the fact that the at least one terminal (MS) has a connection request signals to receive and / or transmit data via the multicast channel (GC Ch).

6. The method according to any preceding claim, wherein the group call channel (GC Ch) is constructed and / or occupied depending on the fact that the at least one terminal (MS) via the group call channel (GC Ch) to be transmitted data to be transmitted.

7. The method according to any preceding claim, in which is checked by a network-side control device (BSC) at intervals (T), in which radio cell of the base stations (BSl, BS2), the at least one terminal (MS) is, and dependent thereon the construction, the occupancy or a reduction of the group call channel (GC Ch) in corresponding adjacent radio cells (Zl, Z2) is caused.

8. The method of claim 7, wherein the time intervals (T) for testing shorter than an expected shortest residence time or shorter than an average residence time of the at least one terminal (MS) in a radio cell (Zl, Z2) are set.

9. The method according to any preceding claim, wherein a spatial movement of the at least one terminal (MS) is determined, and depending on a structure and / or occupancy of the group call channel (GC Ch) in radio cells (Zl, Z2) is caused, which lie in expectable possible movement ^¬ directions of at least one terminal (MS).

10. The method according to any preceding claim, wherein a spatial movement of the terminal (MS) by means of Signali ^¬ sations and / or data transmissions of the at least one terminal (MS) via the group call channel (GC Ch) is determined.

11. A method according to any preceding claim, in which after or in connection with a logout or failure of the

Terminal (MS) in the area of the first base station (BSl) of Group call channel (GC Ch) in the radio cell (Zl) of the first Ba ^¬ sisstation (BSl) and in the at least one radio cell (Z2) of the second base station (BS2) is degraded.

12. radio communication system, comprising at least two base stations (BSl, BS2) and at least one terminal (MS), wherein the at least two base stations (BSl, BS2) each have a transmitting / receiving device, which are designed to set up a physical group call channel (GC Ch) for a transmission of data of a group call connection service, and wherein the terminal (MS) has a Sen ^¬ en / receiving device which is designed for sending and / or receiving data in the physical Gruppenrufkanal (GC Ch), wherein a second of the at least two base stations

(BSl, BS2) of the radio communication system in the field at ^¬ least one of its radio cells (Z2) at least one physical Gruppenrufkanal (GC Ch) set up for transmission of data from a Gruppenrufverbindungsdienstes and / or is occupied, and wherein the structure and / or the Assignment of the Gruppenrufka ^¬ nals (GG ch) depending on the fact that in the area of a radio cell (Zl) to the second base station (BS2) adjacent first (BSl) of the at least two base stations (BSl, BS2) at least one terminal (MS) located.

13. Terminal (MS), comprising at least one Sen ^¬ de / receiving means for establishing a physical Gruppenrufkanals (GC Ch) to a base station (BSl) of a radio communication system for transmitting and / or receiving data of a group call connection service, wherein the terminal is configured for carrying out a method according to one of claims 1 to 11.

14. A base station (BS) of a radio communication system, up-setting at least one transmitter / receiver device for establishing a physical Gruppenrufkanals (GC Ch) for an over ^¬ transmission of data of a Gruppenrufverbindungsdienstes to / from at least one terminal (MS), wherein the transmitting / receiving device and / or a control means is arranged for establishing and / or documents of Gruppenrufkanals (GC Ch) in at least one radio cell depen ^¬ gig that at least one terminal (MS) in the region of a radio cell (Zl) of an adjacent Base Station (BSl) is located.

15. Base station (BS) according to claim 14, which is configured to carry out a method according to one of claims 1 to 11.