Cordless telecommunication system with backup interoperability of cordless telecommunication applications, in particular of a gap-specific dect system

ES 2 176 509 T3

DESCRIPTION

Wireless communication system with assured interoperability of wireless telecommunication applications, especially a specific GaP DECT system.

In telecommunications systems with a telecommunications transmission path between a message source and a message receiver, sender devices and receiver devices are used for the processing and transmission of messages, in which

1) Message processing and message transmission can be performed in a preferred transmission direction (Simplex mode) or in both transmission directions (Duplex mode),

2) the processing of messages is analog or digital,

3) the transmission of messages is carried out wirelessly through the telecommunications transmission path on the basis of various message transmission procedures FDMA (F requency Multiple Division Access = Multiple Access by Frequency Division), TDMA (Time Multiple Division Access = Multiple Access by Time Division) and / or CDMA (C or Multiple Division Access = Multiple Access by Code Division) - for example, Follow radio standards such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC, etc. [see IEEE Communications Magazine, January 1995, pages 50 to 57; DD Faconer et al .: "Multiple Time Division Access Methods for Wireless Personal Communications"].

"Message" is a higher order concept, representing both a meaning (information) and also the physical representation (signal). Despite the same meaning of a message - therefore, of the same information - different forms of the signals can appear. Thus, for example, a message referring to an object can be transmitted (1) in the form of an image, (2) as a spoken word, (3) as a written word, (4) as a coded word or image.

The type of transmission according to (1) ... (3) is characterized in this case normally by continuous signals (analog), while in the type of transmission according to figure (4) discontinuous signals are usually obtained (for example, pulses , digital signals).

Starting from this general definition of a telecommunications system, the invention refers to a wireless telecommunications system with assured interoperability of wireless telecommunications applications, especially a specific GAP DECT system according to the characteristics of claim 1 of the patent. .

Wireless telecommunication systems with assured interoperability of wireless telecommunication applications are DECT systems (Digital Enhanced (formerly: European) Cordless Telecommunication; see (1) “Nachrichtentechnik Elektronik 42 (1992) January / February N ° 1, Berlin, DE ; U. Pilger "Struktur des DECTStandards", pages 23 to 29; (2) telcom report 16 (1993), N ° 1, JH Koch: "Digitaler Comfort fur schnurlose Telekommunikation - DECT-Standard eroffnet neue Nutzungsgebiete", pages 26 and 27;

(3) Philips Telecommunication Review Vol. 49, N^° 3, September 1991, RJ Mulder: "DECT, a universal cordless access system" pages 68 to 73; for which a GAP Standard (Generic Access Profile; see ETSIPublikation prRTS 300 444, April 1995, Final Draft , ETSI, FR). According to the DECT Standard, following the representation of figure 1, a DECT BS base station can be established, through a DECT air interface, designed for the frequency range between 1.88 and 1.90 GHz. , a maximum of 12 communications following the TDMA / FDMA / TDD procedure (Time Division Multiple Access = Multiple Access by Time Division), (Frequency Division Multiple Access = Multiple Access by Division of Frequency), (Time Division Duplex = Tempo Division Duplex Mode) in parallel with the DECT MT1 ... MT12 mobile parts. The number 12 results from a number k of time slots or telecommunication channels that are available for the Duplex mode of a DECT system (k <12). The communications can be in this case internal and / or external. In the case of internal communication, two mobile parts registered in the base station BS, for example the mobile part MT2 and the mobile part MT3, can communicate with each other. For the establishment of an external communication, the base station BS is connected to a telecommunication network TKN, for example, through a telecommunication connection unit TAE or through a private exchange NStA. In the case of external communication, with a mobile part, for example with the mobile part MT1, the telecommunication connection unit TAE or the private exchange NStA can communicate, through the base station BS, with a subscriber in the TKN telecommunication network. If the BS base station - as in the case of the Gigaset 951 (Siemens Schnurlostelefon, see telcom report 16; 1993), N^° 1, pages 27 and 27) - it only has one connection with the telecommunication connection unit TAE or with the private exchange NStA, then only one external communication can be established. If the BS base station - as in the case of the Gigaset 952 (Siemens Schnurlostelefon; see telcom report 16, (1993), N^° 1, pages 26 and 27) - it has two connections with the telecommunication network TKN, then it is possible, in addition to the external communication with the mobile part MT1, another external communication from a telecommunication terminal TKE by cable connected in the base station BS. In this case, in principle, it can be conceived that a second mobile part, that is, the mobile part MT12, uses, instead of the ter2

ES 2 176 509 T3 telecommunication terminal TKE, the second connection for external communication. While the moving parts MT1 ... MT2 are powered by a battery or an accumulator, the base station BS configured as a small wireless switching installation is connected to a voltage network SPN via a network connection device. NAG.

Starting from the simple DECT system, preferably used for the private area according to figure 1, applications of the DECT system are now conceivable, for example, in the small public area, in which a number m of mobile parts with m> k are connected. with a base station via the DECT air interface.

In the “m” mobile parts, for example, with m = 20, it is in this case, according to figure 2, a number m1 of mobile parts-DECT D-MT and / or a number m2 of mobile parts-GAP G-MT, where the following condition applies: m = mi + m2, where mi e N₀ with n = 0, 1, 2, ... and m, m2 e

N1 with n = i, 2, 3, ...

If in a DECT / GAP system of this type it occurs that it is signaled to a GAP G-BS base station, which can be configured, for example, as an antenna diversity base station, the desire of a subscriber telecommunication network from the telecommunication network TKN, to enter into a telecommunication connection with one of the mobile parts, then the base station-GAP G-BS must communicate it to the mobile parts D-MT, G-MT associated with it. . This communication is carried out, for example, by sounding on the mobile parts D-MT, GMT (water indication). As an alternative, other forms of indication are also possible (eg, ioptic indication).

Following the GAP standard, it is not possible for my mobile parts-GAP G-MT to ring that telecommunication channels are available through a GAP air interface at the base station-GAP G-BS. This results from the fact that, according to the GAP standard, the ringing in the mobile part-GAP G-MT is only triggered when a communication is established between the base station GAP G-BS and the mobile part GAP G-MT through a message defined in the GAP standard. In this case, it is an essential (mandatory) feature of power or performance (feature) of the GAP standard, which must be supported by all GAP G-BS base stations and by all mobile parts-GAP G- MT. With this feature, a more or less simultaneous call is made of the individual mobile parts-GAP G-MT, associated with the base station-GAP G-BS (quasi-collective / group call; GAP call; cable call). If mobile parts GAP G-MT are called in a GAP system of stetypomies that the telecommunication channels k that are available through the GAP air interface at the base station-GAP G-BS (m2> k), then for these first parts Mobiles-GAP “k” A maximum of one telecommunication channel was available at the GAP G-BS base station. No communication can be established from the other mobile parts-GAP G-MT, through which a ringing can be caused.

ETSI currently defines a collective / group ringing without connection, which, however, does not comply with the GAP standard. This means that a GAP mobile party cannot ring at a base station - for example a DECT base station, which uses this group / collective call without connection.

Figure 3, based on the publication Components 31 (1993), No. 6, pages 216 to 218; S. Althammer. D. Briikmann: “Hochoptimierte IC's fur DECT-Schnurlostelefone”, shows the principle structure of the GAP G-BS base station circuit according to figure 2. E^í This consists of a radio part FKT, a signal processing device SVE with a signal control part SST configured as a Time Switch Controller TSC with switching functions (Switch-Functions) and with a part of SUT signal conversion, configured as CODEC and as AD / DA converter, with a TG clock pulse generator, with a MIC microcontroller, with an LSS line interface for the TAE telecommunication connection unit and for the NStA private exchange and with an SVG power supply, which are connected to each other as shown., A PGM program module is contained in the MIC microcontroller for the realization of the collective / group call without connection. The principle operating mode of the circuit structure in connection with the mobile parts D-MT, G-MT is comparable with that of a DECT circuit structure. The principle mode of operation of the DECT circuit structure is described, for example, in the aforementioned publication.

The purpose on which the invention is based is that in a wireless telecommunication system with assured interoperability of wireless telecommunication applications, especially a GAP-specific DECT system (DECT / GAP system), with a wireless base station and with wireless mobile parts capable of communicating with the wireless base station through an air interface and exceeding in number the number of telecommunication channels that are available in parallel in With the wireless base station, a collective / group call is possible and in this case the interoperability of the wireless telecommunication applications is preserved.

This task is solved by means of the characteristics indicated in claim 1 of the patent.

The idea on which the invention is based consists in realizing in a telecommunication system that processes and transmits messages - such as images, spoken words, written words, words or coded images - with assured interoperability of wireless telecommunication applications of the aforementioned type and explained at the beginning - for example, a GAP-specific DECT system (DECT / GAP system) - a mixed operation consisting of a quasi-group / group call with connection and a collective / group call without connection. In this case, it is set to

ES 2 176 509 T3 the wireless base station in which wireless mobile part is made a quasi-group / group call with connection (GAP call; connection call) and in which wireless mobile part is made a collective / in-line call group without connection (call without connection). The wireless base station has correspondingly configured means for controlling the connections to the wireless mobile parts for this purpose. These means comprise, for example, a microprocessor present in the wireless base station with a program module configured to control the call.

Advantageous developments of the invention are indicated in the dependent claims.

An exemplary embodiment of the invention is explained with the aid of FIG. 4.

Figure 4 shows, starting from figure 3, a modified circuit structure of the base station-GAP G-BS according to figure 2. With this circuit structure the base station-GAP G-BS can be realized for the mobile parts-DECT D-MT and / or for the mobile parts-GAP G-MT associated with the base station-GAP G-BS On the one hand, in addition, the collective / group call without connection intended for the mobile parts-DECT D-MT and, on the other hand, the quasi-collective / group call connected with the mobile parts-GAP G-MT. In the MIC microcontroller according to FIG. 3 an extended PGMme program module was provided for this purpose, modified with respect to the PGM program module. Through this module of the PGMme program, it is determined in which of the mobile parts D-MT, G-MT associated with the base station-GAP a collective / group call is made without connection or a quasi-collective / group call with connection. With the PGMme program module, the base station-GAP G-BS is designed for both call possibilities (mixed operation).

In figure 2 it is assumed that in the mobile parts D-MT, G-MT, recognition means are designed implemented for the call possibilities of the GAP G-BS base station, respectively, only for the specific call possibility of the mobile part. (uonic operation). But it is also possible that, for example, a number m3 of DECT / GAP “D / T-MT” mobile parts are connected via the GAP-interface with the G-BS base station-GAP by means of telecommunication. These DECT / GAP mobile parts "D / G-MT" are designed, with respect to the recognition means, for both call possibilities (double operation; mixed operation). The condition established with the explanation of figure 2 is then. m = mi + m2 + m3, where ml, m3 and N₀ with n = 0,1,2, ... ym, m2 and N1 with n = 1, 2, 3, ...

The number of the mobile parts G-MT, D / GMT, which only understand the almost collective / group call with connection (called GAP) results from the number “k” of the telecommunication channels that are available in the station. base-GAP G-BS. For the acceptance of a call from a mobile party D-MT, D / GMT, which has been called through a collective / group call without connection, a telecommunication channel ( time division) of the station must be available. base-GAP GBS. In this case, for example, a number "i" of the mobile parts D-MT, D / G-MT are called through the collective / group call without connection. Since at least one telecommunication channel must always be reserved for the collective / group call without connection, the number “j” of the mobile parts G-MT, D / GMT called according to the GAP standard is lower than the number of channels telecommunication (j <k).