MXPA96005770A - Arrangement of telecommunication systems - Google Patents

Abstract

The present invention relates to an arrangement for interconnecting a first communication system with a number of first terminals, and a second communication system with a number of second terminals, wherein the second communication system is a wireless communication system and the first The communication system is a cellular mobile communication system, comprising at least one mobile switching center, the interconnection arrangement comprising an interaction function means, wherein the inter-reaction function means is connected, through the existing interface from the first communication system, to a second mobile switching center of the first communication system and is connected, through a second interface of the second communication system, to the second communication system, the inter-reaction function means inter-reacts protocols, so that the second interface becomes the existing interface of the first communication system and the inter-reaction function provides simulation of a base station subsystem of the first communication system and a first terminal, through the existing interface in a non-modifying manner

Description

ARRANGEMENT OF TELECOMMUNICATIONS SYSTEMS FIELD OF THE INVENTION The present invention relates to an arrangement for interconnecting a first communication system and a second communication system, such as a wireless access system. The invention also relates to a communications system comprising a first cellular, mobile, communication system and a second wireless access system. In addition, the invention relates to a wireless access communication system, which works internally with a cellular, mobile, communications system. Also, the invention relates to an arrangement for interconnecting a first and a second system and also to an interconnected system, used to handle the location and control both between the first and second systems and between different sites of the second system. The so-called wireless digital communication systems are, for example, used for a limited number of subscribers within a limited area, such as within an office building or the like. Particularly, such systems are pico-cellular and comprise a number of base stations, which are connected to a central unit. Through controllers from a pico-cell to another pico-cell, the user can travel the area covered by the network. Such systems can be configured to meet particular requirements with respect to the area to be covered and the number of terminal units, in a particular mode, how portable telephones will be used, etc. The systems can be particularly designed to operate indoors with a high density of traffic. However, a limited number of subscribers can coexist within the system. An example of such a communication system is the DECT system, the European Digital Wireless Telecommunications System, which is a wireless, pico-cellular digital access technology, standardized by the ETSI (European Institute for Telecommunications Standardization). However, a DECT terminal can not travel through the different sites covered by the DECT and the DECT terminal will only operate when the subscriber is within a limited area, as defined by the network. Currently, a number of attempts have been made to connect, for example the DECT access system to a cellular network and to use the mobility management functionalities of this network and to provide interconnection with the cellular, mobile, communication system, such as, for example, the GSM system STATE OF THE ART Currently efforts are made to provide the ability to travel between, for example, different sites of the DECT, through the use of a fixed network, also, work has been done within the ETSI to provide a standardization of an internal work between the GSM and the DECT. However, until now there are really no known systems of internal work. In the article "Cordless access to GSM", in Proceedings of the 52nd Nordic Digital Mobile Radiocommunication Seminar, 1992, by S. Salmela et al., The access of the DECT system to the GSM network is discussed and an arrangement is suggested in which the Controller of Fixed Parts of the DECT system is connected to a Mobile Switching Center (MSC) over an interface named R (3) interface, which is a modified interface of the ISDN subscriber, which uses the named DSS.1 + protocol, which is a ISDN enhanced DSS.l protocol. Since the DECT access system is connected directly to the MSC, modification of the interface or protocol is necessary. This involves complications and impairs the easy interconnection of systems, as well as reducing flexibility. COMPENDIUM OF THE INVENTION The invention is directed to solve the problems of interconnecting a first communication system, such as a cellular, mobile, communication system, and a second communication system, such as a wireless access communication system, in an easy and flexible way. In the so-called wireless access system, the connections can in general be merely adjusted within each separate site of this system and furthermore a subscriber of such a system can not maintain access to a more global cellular, mobile, communication system. So far, to interconnect a first and a second system of the aforementioned kind, at least the interface of the first cellular, mobile, communication system has to be modified, which means that a completely new interface will be formed. It is thus an object of the present invention to provide an arrangement for interconnecting a first cellular, mobile, communication system and a second wireless access communication system. It is also an object of the invention to provide an interconnected communication system comprising a first cellular, mobile communication system and a second wireless access communication system. An object of the present invention is to use the already present functionality of the cellular, mobile communication system. It is also an object of the present invention to provide a wireless access system, which works internally with a cellular, mobile, communication system.It is a further object of the invention to take care of the location and path update capabilities between different sites covered by the second wireless access cellular communications system It is also an object of the invention to take care of the capabilities of updating the location and path between the first cellular, mobile, communication system and a wireless access system. It is also an object of the invention to provide the named wireless access communication with the ability to be reached from different site and establish connections for different sites.Another object is to provide an interconnection arrangement for interconnecting a first system, as mentioned previously, and a second wireless system, just like a interconnected communication system, which enables control to be carried out both between the first and second systems, as well as between different sites of the second system. These and other objects are achieved through an arrangement in which the wireless access system is connected to an internal work function element, by means of an interface of the wireless access system and in which a mobile switching center of the system cellular, mobile, communications, through an existing interface, is connected to the internal work function. The objects are also achieved through a communication system comprising a first cellular, mobile, communication system and a second wireless access communication system, in which an interface of the second system is worked internally or converted into an element of communication. internal work function to an existing interface of the cellular, mobile, communications system. A further object of the invention is to provide the possibility of using one and the same terminal for the connections, both within one and the same system as well as between the first and second systems, as mentioned above. This is achieved through the use of the terminal of the named double mode, which comprises both functionalities. A number of advantageous modalities are given by the attached "" secondary claims. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically illustrates the interconnection of the DECT and GSM systems; Figure 2 schematically illustrates the ability to travel between two DECT sites via the GSM network; Figure 3 illustrates schematically the use of a double mode terminal; Figure 4 illustrates a simplified interconnection of a first and a second communication system; Figure 5 illustrates a general configuration of the internal work function, connected by means of the interfaces; Figure 6 schematically illustrates the internal work function, IWF; Figure 7 illustrates the BSSAP module of Application Part of the Base Station System; Figure 8 illustrates the call control CC module; Figure 9 schematically illustrates the Operation and Maintenance module, O &M; Figure 10 illustrates the IWE module of the Internal Work Entity; Figure 10a schematically illustrates an outgoing call from the DECT to the GSM; Figure 10b schematically illustrates an incoming call from the GSM to the DECT; Figure 11 illustrates the IWF, Work Function Internal, with its GPC board; Figure 12a illustrates a table on identity management from the CFP, Fixed Control Part, to the IWF, Internal Work Function; Figure 12b illustrates the identity management table, as in Figure 12a, but in the direction from the MSC to the I F; Figure 13a illustrates a call-day establishment, which originates from the CFP, where the called party answers; Figure 13b illustrates a call setup, which was original from the CFP, as in Figure 13a, but where the called party is busy; Figure 14a illustrates a call setup terminated in CFP, in which the called party answers and Figure 14b illustrates a call setup terminated in CFP, as in Figure 14a, but where the called party is not reachable; Figures 15a-15d illustrate message tables for the Mobile Application Part of the Base Station, BSSMAP, and for the Direct Transfer Application Part, DTAP, respectively; Figure 16a schematically illustrates a signal flow diagram for a control between the DECT and the GSM and Figure 16b schematically illustrates a signal flow diagram for control from a DECT site to another DECT site.

"'" DETAILED DESCRIPTION OF THE INVENTION In the following, an advantageous modality in which the first communication system is the GSM system will be described and the second system is the European Digital Wireless Telecommunications System, DECT, which is a communications system. wireless access, digital, pico-celular. Of course, the invention can be applied in relation to other communication systems and is not limited to telephone communication systems. For example, it can be applied to the Integrated Services Digital Network, ISDN, etc., which forms the first system and any other wireless, digital communications system, in addition to the DECT, can be used applying the same principles. The communication system does not have to be digital and the invention is equally applicable to analogous systems, such as, for example, NMT, AMPS, TACS and the like, particularly since it does not use the air interface. The systems, in an advantageous modality, use the Time Division Multiple Access, but this is not indispensable either. The invention thus also refers to systems based on Frequency Division Multiple Access, FDMA and also CDMA. Figure 1 illustrates a configuration in which the fixed part, comprising the internal work function, IF, the fixed fixed part, CFP, and a fixed part of the radio, '~ RFP, which via an interface A is connected to a second Mobile Switching Center, MSC, which is a cellular switching node, and also has the functions of a normal MSC. The internal work function, IF, interconnects this second Mobile Switching Center, MSC, and a DECT access system, via an A interface of the GSM system, without modifications of the A interface. The second Mobile Switching Center, MSC , it connects to the operational GSM network, or its first Mobile Switching Center, MSC, by means of a Mobile Application Part, MAP, or the User Part of the Integrated Services Digital Network, ISUP. In this way, the call connections between the PP terminal of DECT and the GSM terminal MS are enabled. Figure 2 illustrates how the travel capabilities between the two terminals PPl and PP2 of the DECT are supplied, in different places, through the use of the mobility management functionality of the GSM network, in accordance with the invention. A first and a second fixed part, RFP1, RFP2, refer to two different sites of each pico-cellular wireless telecommunications system. For reasons of simplification, the second Mobile Switching Centers are not illustrated in this figure. In Figure 3, the dual mode terminal or the GDMS terminal (GSM-DECT Mobile Station) is illustrated, which uses particularly the same number of subscribers, regardless of whether the terminal is in GSM mode or in DECT mode. In this case, the second cellular switching node is used to handle specific functions specific to the GSM, such as authentication and encryption, etc. With double-entry subscription, a subscriber will always be reached, regardless of whether they are within the DECT coverage or not. Figure 4 illustrates an array interconnected with a first mobile communications network and a DECT access system. The interconnection is obtained by means of a second Mobile Switching Center / Visitor Location Registrar, MSC / VLR and the internal work function, I F. This internal work function, IWF, is used to interconnect the second Center Registrar Switching Mobile / Visitor Location, MSC / VLR, and the DECT access system, via the GSM interface A, by converting the protocol of the second interface to the protocol of the first interface. This, in turn, connects to the operational GSM network. The second Mobile Switching Center / Visitor Location Registrar, MSC / VLR, can be a standard device and a particular modification is generally not necessary. Through the internal work function, IWF, communication is provided between the second Mobile Switching Center / Visitor Location Registrar, MSC / VLR and the DECT access system over the GSM A interface. The internal work function comprises, in particular, a computer platform and a user communication interface or, for example, a general purpose board UPSim, GPCB. The software of the internal work function, I F, comprises a number of modules. This is described below below. However, this merely constitutes a modality of the Internal Work Function which, of course, can be modified in a number of ways, the essential one is that it provides for the conversion of the protocols to enable the use of the existing interface of the first system. In a particular embodiment the DECT access system can be particularly named the DCT 1800 system. The Common Channel Signals interface can be input, for example, into a PCM link of 1.5 or 2Mbit for the connection of the DECT access system to, for example, a PCM interface of 1.5 to 2Mbits of the internal work function, I F. Of course, a number of other values can also be used. The Common Channel Signal interface will be described below. Figure 5 illustrates the interconnection of the DECT access system with a GSM network. The internal work function, IWF, interconnected the signal protocols between the A interface, which is connected to a second Mobile Switching Center, MSC, already discussed above, and a patented Common Channel Signal Interface, CCS, which is connects to a Fixed Control Part, CFP, or REX radio exchange of the DECT access system or the second system, to which the fixed radio parts, RFP, are connected. The functions 5 supported by the Internal Work Function, I F, are given by the internal work protocols. VLR in the figure illustrates a Visitor Location Registrar. Figure 6 illustrates the internal work function, I F, as already indicated, in the modality described, that ate on a PC or a computer platform and a Communication Interface or a line interface board. The Internal Work Function, IF, comprises a number of different modules, for example the internal work entity, IWE, which handles the mapping of 3 layer messages, between the CCS 15 interface and the A interface. Advantageously, a function of Call Control in the internal work entity, IWE. - This internal working entity, I E, will be described below under the reference to Figure 10. The Part of the Application of the System of the Base Station, BSSAP, is an additional module that handles channel assignment and message transfer over interface A. The Application Part of the Base Station System, BSSAP, which is used in the internal work function, IWF , is a subset of a complete BSSAP, which will be discussed 5 below under the reference of Figure 7.

The Operation and Maintenance module, O &M, is particularly suited for the internal work function, I F, and will also be described below. The Call Control module interfaces with the internal work entity and the device driver. This Call Control module will be described below under the reference to Figure 8. The additional modules of the internal work function, I F, are the Controlled Part of the Signal Connection, SCCP, which comply with rec. of the blue book CCITT Q.711-Q.714 in general and level 3 of the message transfer part in compliance with rec. from the blue book CCITT Q.701-Q.705. The line interface board comprises a multichannel and a Link Access Procedure on the D channel, LAPD and a level of the Message Transfer Part 2 MTP-L2. As already mentioned above, the interface A supplies the interconnection with the GSM network via the second MSC / VLR, while a common channel signal interface CCS provides the connection with the DECT system. A number of procedures / messages will be supported on those interfaces along with the information elements supported within the messages. First, the CCS interface will be briefly described. This CCS interface is a subset of Q.931 with additional functionalities to support mobility management and operation and maintenance functions. The internal work function, IWF, will support the control of basic calls in almost its entire extension. The necessary functions of mobility management will be supported for the purpose of registering and deleting the record of the handling of the DECT PP terminals. Also the Operation and Maintenance functions will be supported in this particular modality. The following will summarize which procedures, messages and information elements are supported. A number of messages are sent either by the internal work function, I F, or by the Fixed Control Part, CFP (radio exchange, REX) or both. A number of Common Channel Signal messages, CCS, are sent for circuit mode connection control. An example is the location update procedure, which sends a message which can be sent by IWF or CFP, to indicate that the message has been initiated. location of the user of the call. Subsequent procedures comprise the travel and control. The latter case is illustrated in Figures 16a and 16b, in which Figure 16a refers to a control from DECT to GSM and Figure 16b refers to a control between the DECT sites, with a second common MSC, although another case it is also possible, ie between two seconds MSC (not illustrated). A subsequent message, which proceeds to the call, may also be sent by the I F or the CFP. This message serves for the purpose of indicating that the required call establishment has been initiated and no further call establishment information is expected. Additional messages, such as a message to indicate the acceptance of the call by the called user, here the called connection, and another message indicating that the user has been waiting for the call, here called connection acknowledgment, can be sent or by the IWF or the CFP. By the CFP message a request can be sent to the IWF to release the connection or it can be sent by the I F to indicate that the connection is free, (disconnect message). The IWF is provided with a called party number by a message sent by the CFP. Messages indicating that a channel has been disconnected and that the channel and call reference will be released and to indicate that the channel used and the call reference are released, they can be sent by the IWF or the CFP, respectively. The message for initiation of call establishment is also sent either by the IWF or the CFP. Also, a number of CCS messages for non-circuit mode connection control are sent either by the IWF or the CFP. In the particular mode, the A interface that is supported by the IWF is a subset of a standardized A interface. In the following, it will be briefly discussed which procedures, messages and information elements will be supported by the internal work function,. I F. For the provision of communication between the Mobile Switching Center and the Internal Work Function, I F, a number of messages are available. These are particularly divided into two main categories, namely the 5 BSSMAP, the Mobile Application Part of the Base Station System messages, and the DTAP, or the messages of the Direct Transfer Application Part. The last messages can also be divided into three different categories, that is, the Resource Management messages of the Radio, Mobility Management messages and Call Control messages. Figures 15a to 15d illustrate lists of: a - messages for BSSMAP, b - messages for the Application Part of 15 Direct Transfer / Management of Radio Resources, messages, RR,? ~ - c - messages for DTAP Management / Mobility, MM, d - messages for the control of DTAP / Call, CC.

In the tables, it is also illustrated where the messages originate, that is, from where they are sent. The tables, in the following will make a brief review of this. The assignment request is sent from the MSC to the IWF, to request the IWF to assign a terrestrial circuit or a traffic channel. The IWF does not take into account the information element of the channel type, since this merely applies to the GSM interface A. Preferably, the oriented mode of the connection of the Control Gate of the Connection of Signals, SCCP. The complete assignment message indicates that the requested assignment has been completed from a correct way. With the clear request message indicating to the MSC that the IWF wishes to release the connection, while the cleared command message instructs the I F to release the connection. With the complete message thrown away, the MSC is informed that the connection has been cleared and the messages relating to reset respectively indicate to the receiving unit that the transmission unit has suffered a failure, etc. and that the services can be resumed respectively. The paging messages contain the identity information to enable the pagination of a portable part, PP, of the DECT. The complete Layer 3 information of the message is sent from the I F sz. . . . . . to the MSC, upon receiving the message from the initial layer 3, in the Common Channel Signal interface. The I F may include a request for updating the response location to the paging, or a CM request (Connection Management). Here the complete layer 3 information can be a mobility management message or radio resource messages, as listed in Figures 15b, 15c. The following BSSMAP messages refer to messages that, as such, are known per se, and will generally be obvious to apply.

In response to a paging message, the I F sends a paging response message, which is a message for the management of radio resources (RR). When a DECT or PP station is present in a particular location area, the IWF sends a location update request to the Mobile Switching Center, MSC, in order to register the portable part. To indicate that an update has taken place and has been completed on the network, the Mobile Switching Center, MSC, sends an acceptance of the location update to the internal work function. If the update has failed, the Mobile Switching Center instead sends a reject location update to the internal work function. To request the establishment of a circuit switched connection, the internal work function sends a CM service request to the Mobile Switching Center and if this center sends a CM service rejection to the internal work function, it is indicated that the circuits requested with your connection establishment can not be supplied. When an alarm has been initiated to the user of the call, the mobile switching center sends an alert message to the internal work function or the other way round. The internal work function sends a call confirmation message to the MSC in order to confirm a call entry request. The message that proceeds to the call gives the information that the requested A * ~ information of the call establishment has been received and that no further call setup information will be accepted. The connection of the message indicates the acceptance of the call by the called user. Part of this as well as subsequent messages are already known and the meaning must be understood, the main emission and its procedure, from where and to where they are sent, which is also indicated in the tables of Figures 15a-15d. Generally (in this particular mode) the Mobile Switching Center does not include the called party number in an adjustment message. The Internal Work Function, IWF, determines the number of the called party based on the IMSI (International Mobile Subscriber Identity) key in a paging message. In the following, the respective modules of the Internal Work Function, I F, will be described briefly. In Figure 7, the part of the Base Station System Application, BSSAP, is illustrated. The assignment of the BSSAP management channel and the transfer of message on the interface A. Figure 7 illustrates the functional blocks of the BSSAP and the interfaces between the blocks and towards other functional modules. As you can see from the Figure, the BSSAP has interfaces to the internal work entity, IWE, the Signal Connection Control part, SCCP, and the common Operation and Maintenance module. The management connection of the SCCP interface block with this SCCP, which is used to provide the possibility of carrying information between the internal work function and the Mobile Switching Center. The interface block of the internal work entity, IWE, between the BSSAP and this internal work entity, IWE. The message transfer block is used to transfer the Call Control and Mobility Management messages to and from the internal work entity, IE, and the BSSAP logical block that supports all procedures in the Mobile Switching Center and the internal work function, which requires interpretation and processing information related to simple calls and resource management. Finally, the Operation and Maintenance block, O &M, shares with all the Operation and Maintenance functions, which are required from the common Operation and Maintenance module, as illustrated in the Figure. As already mentioned before, the SCCP interface block handles communication with the SCCP module or the Signal Connection Control Part of the CCITT signal system No. 7, which provides the possibility of carrying information between the internal work and the Mobile Switching Center. The way to do this is in itself known. As already mentioned, the message transfer block has the purpose of moving incoming messages * "" from the Mobile Switching Center into the primitive elements of DTAP and BSSMAP and the primitive elements of the internal working entity in the output messages for the Mobile Switching Center. This can be done by discarding those information elements in an incoming message, which is not used by the internal work entity and adding information elements that are not provided by the internal work entity to the outgoing messages. The BSSAP maintains the route to which connection a message belongs, in an advantageous mode, by means of two parameters, i.e. the IMSI key and the connection identity. The IMSI key is used in an offline mode, as long as a connection oriented service within the SCCP is established, a connection identity is used instead. The messages are transferred in a way that is already known. The BSSAP logical block takes care of the BSSMAP messages and acts on them through the translation and sending them forward to and from the internal work entity, IWE, or responding to the Mobile Switching Center in a corresponding manner. Finally, with the Operation and Maintenance block, it is possible for an operator to monitor and control the BSSAP. This can also be done in any other appropriate way, which as such may be known. In Figure 8, the call control module is illustrated. This module has interfaces to the internal work entity, IWE, and the device driver. The Call Control module, CC, is based on a common channel signal interface, which is a patented subset of Q.931. Preferably, the Call Control module of the Internal Work Function merely supports a limited set of functions, which are specified for the Call Control interface. The block named as the controller of the device, transfers the Link Access Procedure on the primitive elements of the D channel, between the LAPD protocol and the LAPD controller / dispatcher, which is a block of the call control module. This generally follows the recommendations of CCITT Q.920-Q.921 (blue book). The LAPD controller / dispatcher also sends the data (Q.931 messages) to the mobility management block MM, to the Call Control logic block and the Operation and Maintenance, O &; M, and vice versa. This is also further evaluated in the CCITT recommendation Q.931, blue book. With mobility of the Mobility Management block, users' terminals are supported. The Call Control logic block handles the primitive elements of the call set-up, the primitive elements of call clearing and several other primitive elements. The Operation and Maintenance block of this case, manages the configuration / startup of the LAPD, CCL and error handling protocol. In later aspects this block works in a generally known manner and provides communication with the common Operation and Maintenance block. Finally, the Upper Dispatcher block is occupied with the primitive elements of the Internal Work Entity module, IWE, or the Mobility Management block, the Operation and Maintenance block or the Call Control logic block. This block dispatches the primitive elements of interest, ie the appropriate block. The Operation and Maintenance block and its interface blocks are illustrated in Figure 9. As can be seen in the figure, the Operation and Maintenance module forms interfaces to the Portable Part. The Internal Work Entity, I E, the Call Control and the management of the Signal System No. 7 (SS / Man) under which are the BSSAP, the SCCP and the level 3 module - part of the message transfer. The blocks of the Operation and Maintenance module are the Man-Machine Interface, MMI, the Programmable Portable Part, PPP, the CSS Control and the Main block. The MMI manages the interaction of the operator and through this operator can control the IWF. From there, a number of functions can be realized as a configuration of the portable part, PP, in the DECT system with, for example, the number of the mobile user, the authentication key, etc. the loading of the configuration parameters for the IWE module and for the CC module, the start and stop of the internal work function and, for example, the location update, etc. The Portable Program Door, PPP, is careful to program the Portable Part, PP, of the DECT, the main block takes care of the primitive elements between the Operation and Maintenance module and the CC module and between the Operation and Maintenance module and EI or the internal work entity module. This forms the interface with both the Call Control module and the internal work entity module. The CSS7 block controls the SS7 stack and the BSAP module through the SS / SS7Man stack address. The primitive elements go to the SS7Man, which analyzes them and sends them back to the appropriate modules. In Figure 10, the internal work entity block, IWE, is illustrated. This block handles the internal work of the network layer messages, between the Common Channel Signals interface, CCS and the A interface. The internal work of the functional signals applies the translation of Q.931 messages to the Control messages Call, CC, GSM (GSM 04.08) and vice versa. The internal work entity, IWE, also handles the mobility management signals, MM, and all the identities that are necessary to guide to and from the DECT PP terminals within the system. As can be seen, for example from Figure 6, the internal work entity module has four different interfaces to other modules. The Operation and Maintenance module, already discussed, manages the operation and maintenance of the entire internal work function and contains the operator-machine interface, MMI, towards the operator as well. The second module to which the IWE has an interface is the BSSAP module that handles the transfer of messages from interface A. A third module is the CC module, which handles the transfer of messages from the interface. CCS Finally, the management of MUX comprises the pitch / busy generation and switches the time slots, TS. The start of the tone generator will be handled by the internal work entity, IWE, and transferred over the MUX interface. The dispatcher block handles the transfer of the primitive elements between blocks in the module and depend on the state and the event (the primitive element received) that is going to be the next one. Towards the Mobile Switching Center, MSC, the module behaves like a mobile station, MS, of GSM. The dispatcher manages the sessions by connecting channel B of the interface call control to a connection identity of the BSSAP interface. The IMSI determines the MSISDN number of the user in the DECT system. The logic block of I E handles the translation of the network layer (message data of layer 3). Also, the data may be necessary to be transferred from one type of storage to another. The main function of the I E is to transfer the calling party number from the DECT system to its IMSI (International Mobile Subscriber Identity). The IMSI values are loaded at the start of the internal work function. In order to handle the internal work between the DECT and the GSM system, the internal work entity has to manage three different entities, namely the call's departure number, the called party's number and the IMSI key. The translation of the identities in the case of an outgoing call from the DECT system in the GSM system is illustrated schematically in Figure 10a. Figure 10b illustrates, in the same way, an incoming call from the GSM system to the DECT system. Advantageously, the IWE logic has to check that the subscriber does not call the MSISDN-GSM (MSISDN-G) number itself. If this is the case, a busy tone can be generated in the advantageous mode. The call control interface of the block handles the signals to and from the IF Call Control and the I E dispatcher. The call control interface is an interface for both call control, CC, management of the circuit-switched calls and the registration of mobility management, MM and the authentication of the mobile part. The BSSAP interface block handles the signals to and from the BSSAP and the IWE dispatcher.

The MUX interface block handles signals to MUX. These, among others, include connecting and disconnecting the time slots TS in the MUX and the generation of busy tone / tone to the sessions, ie the interface block of the MUX, among others, initiating or terminating the switching of the slots. of time. The module of the Operation and Maintenance interface handles the signals to and from the module of the Operation and Maintenance of the Internal Work Function, I F, to the dispatcher of the IWE. The module of the Operation and Maintenance interface is used for the configuration, to start the module I F and to report errors. The Operation and Maintenance module also supports the possibility of doing a position update. In the configuration request, the following parameters are loaded into the internal work entity; the use number of the portable part of the DECT, PP, PUN, the authentication key of the DECT user, a parameter which is used merely by the Call Control module and finally the IMSI key of the DECT user. The interface of the Operation and Maintenance module also handles other functions that, however, are of a general nature and will not be discussed or referred to here.

As previously mentioned, the internal work function comprises a user's Communication Interface or a GPC board. This is further illustrated in Figure 11. In an advantageous embodiment, this GPC board comprises functionalities that are necessary for the control of the MUX and for the generation of different tone patterns, apart from other functions. The Link Access Protocol is used, LAP, for communication with the DECT network and signal protocol number 7 of the CCITT is used for communication with the GSM network via the interface A. In an advantageous embodiment, the GPC board comprises a functionality for dynamically controlling the MUX. The internal work function, I F, communicates via two protocols, LAPD and the number 7 of the signal system, as well as the MUX and the TONE modules, in the GPCB, by means of the device driver. This device driver handles all signals between the GPBC and the internal work function, IF (also including MUX and TONE messages). The block named LAPD is a real OSI layer 2 realization of the LAPD protocol and as You can see from the figure, this block resides on the GPC board (GPCB). The GPC may be a standard board, but advantageously comprises additional functionalities. However, it can be adapted to the particular requirements and needs that are needed, not defined here. In Figures 12a and 12b, the handling of the identity is illustrated, according to an advantageous embodiment of the invention. A subscriber of the interconnected system will have four different identities, ie an "open" MSISDN for GSM access, which, in this case is called MSISDN-G, an IMSI that refers to the open MSISDN, here named as IMSI-G , a "hidden" MSISDN for access to the DECT, the MSISDN-D and finally an IMSI that is related to the hidden MSISDN, the IMSI-D. This MSISDN-G is used for incoming calls. If the subscriber can not be reached or there is no response, the call forward to the MSISDN-D is made. The paging of interface A is done with the IMSI-D. All PP portable parts of the DECT are configured with the MSISDN-G. Thus, the IWF must map the IMSI-D to the MSISDN-G before paging can be carried out in the DECT system. Also, the internal work function, IWF, must be able to identify calls from a portable part of the DECT PP, which uses its own MSISDN-G, as the called party number. In this case, the internal work function must generate a busy tone. Identity mapping in the direction of radio exchange, REX, to the internal work function, IWF, is illustrated in Figure 12a.

In Figure 12b, the mapping of identities in the direction from the Mobile Switching Center, MSC, to the internal work function, I F, is illustrated. The codes given in the Figures (Figures 12a and 12b, respectively) are given merely as examples. Any other form of coding can be applied. In an alternative mode, MSISDN-G is hidden in place of MSISDN-D. In yet another modality, none of them is hidden. In Figures 13 a, b and Figures 14a, b, examples of illustrative signals with sequence diagrams are shown. The diagrams represent signals at a functional level which for the CCS interface mean the network layer. In the CCS interface all messages are carried within the I frames of LAPD, which indicate that there is no mode change in the data link. In interface A, the category of the message is indicated (DTAP or BSSMAP). Also the mode changes are indicated. The internal work function, IWF, coordinates timers between the interfaces, which, however, will not be described here later. First, Figure 13a illustrates a wireless establishment that originates from a radio exchange or a CFP in a particular normal case, when the called party answers. A normal call establishment, which starts from the portable part, PP, starts with the message set with the called party number. The I F then returns to the adjusted acknowledgment message, with channel B that will be used as a traffic channel. The complete number of the called party is sent in an information message and after receiving the information, the IWF continues to initiate the call adjustment in the interface A through the sending of the service request CM with the IMI that is related to the number of the party that called. After the encryption procedure on interface A has been completed, the I F sends the SETUP with the number of the called party. In this stage, the IWF is essentially transparent for call control messages. The assigned traffic channel in interface A (assignment request) is connected to channel B assigned previously in the CCS interface. A ring tone in band is generated by the Mobile Switching Center, MSC. In Figure 13b, a call setup originated in CFP is illustrated, where, however, the called party is busy. Here, the term "user occupied" is generated by the Internal Work Function, IWF.

The interface connection A is released. Particularly, there are two possible normal release sequences in this case.

Any of the PP is hanging or the PP remains off the hook. Figures 141, 14b illustrate two examples of call setups completed in CFP.

In Figure 14a, the called party responds. When the IWF receives a paging message to a Portable Part PP, it checks the status for the Paged PP Portable Part. However, if you do not register, ignore the page-tion message. If registered, the Internal Work Function, IWF, responds to paging. In Figure 14b, the called party can not be reached. If the Portable Part, PP, can not be reached, for example it is out of coverage, but still registered, the CFP responds with the call procedure message. This does not indicate that the Portable Part, PP, has been reached. When a Portable Part, PP, has been reached, it is indicated with an alarm message. Its reception is advantageously monitored by a chronometer and if this timer expires, the connection will be released. These examples merely constitute call setups in accordance with an advantageous embodiment and are shown merely for illustrative and exemplary purposes and in no way restrictive. Several alternatives are possible. As already noted above, a subscriber of the combined GSM / DECT system can use a DECT terminal or a GSM terminal, depending on the current location, ie whether the subscriber is placed within the DECT or GSM coverage area. An incoming call is guided to the system, that is to say, the part of GSM in the DECT part, where the subscriber is currently registered. This means that the caller always marks the same MSISDN and will not have to know if the called subscriber is currently within the coverage of DECT or within that of GSM. A subscriber of the interconnected system can make outgoing calls both in the DECT system and in the GSM system, depending on the current record. - * Advantageously, the GSM system comprises double subscriptions, in this case two IMSI and two MSISDN, as already discussed above, and the subscriber can be reached in the GSM system or in the DECT system. In an advantageous embodiment, an MSISDN is the official MSISDN of the combined system or the GDMS system. This MSISDN is named as the MSISDN-G, it is say the MSISDN GSM. A calling subscriber has to dial the MSISDN-G in order to call GDMS. The other MSISDN is named MSISDN-D (D designates DECT) and this is connected to the DECT terminal. This MSISDN is advantageously, as also discussed earlier, hidden and will not have to be known by the calling subscriber, and has not yet been known by the subscriber.In an advantageous mode, the forward GSM call services are used for calls from the MSISDN-G to the MSISDN-D, when GDMS can not be reached and there is no response in the GSM system.

"In a particularly advantageous embodiment, the terminals are used in a double mode, ie the terminals which are essentially a combination of the MS of the GSM terminal and the PP of the DECT terminal." In the following, the procedure of calling the mobile subscriber of GSM / DECT is briefly discussed.In the first case, the called subscriber is attached and can be reached in the GSM system.As mentioned above, the calling subscriber dials the MSISDN-G of the subscriber.When this subscriber can be reached , that is, attached and within the coverage of the GSM system, the call will be guided to the Mobile Station, MS, as a call ending in MS in the GSM system, On the other hand, the called subscriber can be disconnected or not reachable in the GSM system As in the above, the calling subscriber marks the subscriber's MSISDN-G, however, if the subscriber can not be reached or does not answer in the GSM system, the call is advanced to MSISDN-D instead of him or The forward call will be routed to the second Registrar of the Mobile Switching Center / Visitor Location, MSC / VLR. This second MSC / VLR adjusts the call to the DECT terminal. Seen from the second MSC / VLR the call setting is a call setting terminated at the Mobile Station, MS, normal. The internal work function, IWF, thus makes the DECT system appear as calls from the normal GSM base station system from the interconnected system can take the form of a call from the first system or the GSM system, or the second system, that is, in this case, the DECT system. When the GSM / DECT Mobile subscriber makes a call from the GSM system, it is handled as an ordinary call originating in GSM MS. However, when a subscriber makes a call from the DECT system, the internal work function, IWF, makes a call setting that appears as an ordinary call originating from GSM MS, set to the second Mobile Switching Center / Registrar of Visitor Location) MSC / VLR. The dedicated functionality of Operation and Maintenance for the interconnected system, in the modality described, the GSM / DECT system, is performed in the internal work function, IWF, as discussed more fully in r. the above. The FI includes the functions of Operation and Maintenance, for example, for the configuration of the PP of the DECT terminals, the loading of the parameters of the configuration for the internal work function and the starting and stopping of the last, the manual update of location to the second MSC / VLR and the registration and presentation of errors, as described in more detail in the previous.

In the above embodiments, the first and second systems refer respectively to the GSM system and the DECT system. However, this is merely an example, the invention can equally be applied to other systems. The 5 second system can, for example, be the CT3 or the "third generation of Wireless Telephony" or the PHP or Personal Manual Phone. The first system can also refer to ADC or PDE that refers to digital, American and Japanese cellular systems, respectively. Without However, advantageously, the second system is based on the TDMA principle, that is, the Multiple Time Division Access. Additional examples of the first systems are the PSPDN and the ISDN and the PCS, Communication System Staff As already mentioned before, analogous systems are also possible. It is not restricted to systems based on TDMA either. Accordingly, the particular systems may be any of a number of systems and the interconnected arrangement and its parts may vary in a number of ways, without departing from the scope of the claims.

Claims (32)

1. CLAIMS 1. An arrangement for interconnecting a first communication system with a number of first terminals and a second communication system, with a number of second terminals, in which the second communication system is a wireless access communication system and the first The communication system is a cellular, mobile communication system, which comprises at least one Mobile Switching Center, characterized in that the interconnection arrangement comprises an internal work function element, which, via a first existing interface of the first system of communications, it is connected to a second Mobile Switching Center of the first communication system and that, via the second interface of the second communication system, is connected to the second communication system.
2. 2. The arrangement, according to claim 1, wherein the second communication system is a cellular wireless access system.
3. 3. The arrangement, according to claims 1 or 2, c a r a c t e r i z a d o p o r q u e the first system is a digital system.
4. 4. The arrangement, according to any of the preceding claims, characterized in that the second interface or the interface of the second system is a Common Channel Signals interface.
5. The arrangement, according to any of the preceding claims, characterized in that the internal work function provides the emulation of a Base Station Subsystem of a first communication system and a first terminal on the first interface of the first communication system.
6. 6. The arrangement, according to any of the preceding claims, c a r t c t e r i z a d o p o r q u e the internal work function, via the first interface, is connected to the Registrar of the Visitor Location of the second Mobile Switching Center.
7. 7. The arrangement, according to any of the preceding claims, c a r a c t e r i z a d o p o r c u e e both the first and the second terminals, provide the original capacity as well as the terminal celas.
8. 8. The arrangement, according to claim 10, wherein the current location of a subscriber of the interconnected network provides if the first or second communication system is to be used.
9. 9. The arrangement, according to any of the previous claims, characterized in that the second interface or the signal int r az of the Common Channel, has an input to a link of the PCM, for the connection of the wireless access system to the interface of the PCM of the internal work function.
10. 10. The arrangement, according to any of the preceding claims, c a r t c e r i z a d o p o r q u e the first system comprises double subscribers.
11. 11. The arrangement, according to the claim 10, c a r a c t e r i z a d o p a t e q e the first system comprises two International Mobile Subscriber Identity codes, and two Integrated Mobile Service Digital Network codes or MSISDN codes.
12. 12. The arrangement, according to the claim 11, c a r a c t e r i z a d o r c e r q u e the first ISISDN is an external MSISDN of the interconnected communication system, while the second MSISDN is connected to a second terminal.
13. 13. The arrangement, according to claim 12, wherein the second MSISDN is hidden.
14. 14. The arrangement, according to claims 11 or 12, c a r a c t e r i z a d o p o r o n e the first MSISDN is hidden.
15. 15. The arrangement, according to any of the preceding claims, c a r t c e r i z a d o p o r o u the internal work function comprises a computer platform and a user communications interface.
16. 16. The arrangement, according to any of the preceding claims, characterized in that the internal work function comprises an internal work entity module, which handles the message mapping (3 message layer) between the two interfaces, particularly the CCD interface and the A interface and a Call Control module, an Application Part of the Base Station System to handle the channel assignment and a message transfer on the first interface, particularly the A interface, and an Operation and Maintenance module.
17. 17. The arrangement, according to any of the preceding claims, c a r a c t e r i z a d o p o r c e r the calls that enter the interconnected communication system, are guided to the first or the second system, depending on the current location of the subscriber of the interconnected network.
18. 18. The arrangement, according to any one of claims 1 to 20, c a r a c t e r i z a d o p a c e r the second system uses the first system to change and guide the functionality.
19. 19. The arrangement, according to any one of claims 1 to 20, is that of the European Wireless Digital Telecommunications System.
20. 20. The arrangement, according to any one of claims 1 to 20, c a r a c t e r i z a d o p o r g u u e the first system is the GSM system.
21. 21. The arrangement, according to claim 20, of the interface of the first communication system or the first interface in the ETSI / SMG interface of the GSM system.
22. 22. The arrangement, according to claim 19 or 20, wherein the first and second terminals are GSM terminals and / or DECT terminals, respectively.
23. 23. The arrangement, according to claim 22, wherein the first and second terminals comprise double-mode terminals, which include the functions of both the first and the second terminals in one and the same terminal.
24. 24. The arrangement, according to any of the preceding claims, c a r t c t e r i z a d o p o r c u e is used to travel through different sites of the second system and to travel between the first system and the second system.
25. 25. The array, according to any of the preceding claims, c a r t c t e r i z a d o p o r c u c e is used to control between different sites of the second system and to control between the first system and the second system.
26. 26. A cellular, mobile communication system, comprising a first cellular, mobile, communication system and a second wireless access communication system, which is interconnected via a first internal work function, and via an interface Existing of the first communication system, it is connected to the Mobile Switching Center of the first system and via the second interface of the second system it is connected to the second system.
27. 27. The communication system, according to claim 26, is a GSM system and the second communication system is the DECT system and because the first interface is the A interface of the GSM system.
28. 28. The communication system, according to claim 26, wherein the first system is a cellular system, such as, for example, AC, PDC, PSPDN, PCS, NMT, AMPS or TACS, etc.
29. 29. A communication system, comprising a first cellular, mobile, communication system and at least one second wireless access communication system, in which the first and second systems are interconnected via an internal work function element , where the second interface of the second system is converted to a first existing interface of the first system.
30. 30. A communication system, according to claim 29, wherein the first system is the GSM system and the second system is the DECT system and where the first interface is the A interface of the GSM system.
31. 31. A communication system, according to claim 29 or 30, comprising a number of terminals, in which at least some of the terminals of the system are double-mode terminals, which have the function of both a terminal and used normally in the first system as a terminal as is normally used in the second system.
32. 32. A wireless access communication system, which is interconnected with a cellular, mobile communication system, in which the wireless system interface is worked internally with an existing interface of the cellular, mobile, communications system, via of an internal work function element, without modification of the existing interface of the first system.