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EP0635185A1 - Method of structuring a b-field format in a dect-standard system - Google Patents

Method of structuring a b-field format in a dect-standard system

Info

Publication number
EP0635185A1
EP0635185A1 EP93906447A EP93906447A EP0635185A1 EP 0635185 A1 EP0635185 A1 EP 0635185A1 EP 93906447 A EP93906447 A EP 93906447A EP 93906447 A EP93906447 A EP 93906447A EP 0635185 A1 EP0635185 A1 EP 0635185A1
Authority
EP
European Patent Office
Prior art keywords
channel
dect
field
standard
isdn
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP93906447A
Other languages
German (de)
French (fr)
Inventor
Horst Flake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0635185A1 publication Critical patent/EP0635185A1/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0457—Connection protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/08—Details of telephonic subscriber devices home cordless telephone systems using the DECT standard
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13098—Mobile subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13298—Local loop systems, access network

Definitions

  • the invention relates to a method for structuring a B-field format in the DECT standard according to the preamble of claim 1.
  • DECT Digital European Cordless Telecommunication
  • DTR-RES 3001 DECT Reference Document Version 2.1; DTR-RES 3001
  • the DECT standard includes a variety of communication services, e.g. B. in private and business.
  • the DECT standard is designed for low-performance cordless communication transmissions between mobile devices (portables) and the surrounding infrastructure for ranges of a few 100 meters. For this cordless communication transmission, a dynamic channel selection of approximately 120 available channels is carried out in accordance with the DECT standard.
  • TDMA Time Devision
  • 24 from 0 to 23
  • time channels are defined in this time-division multiplex frame, thereby specifying a frame scheme.
  • This framework will then be like this uses that for each frequency band twelve stations of a DECT system work simultaneously in duplex mode.
  • a time slot of approx. 417 ⁇ s is assigned to the 24 time channels. This time slot indicates the time in which information (data) is actually transmitted.
  • This transmission of the information in duplex mode is also referred to as a ping-pong method because transmission takes place at a certain point in time and reception at another point in time.
  • a time frame or pulse (burst) of approx. 365 ⁇ s, which corresponds to a frame length of 420 bits, is transmitted in each time slot.
  • the chronological sequence of the transmitted pulses defines a channel (the so-called physical channel) with a data throughput of 42 kbit / s or 420 bit / 10 ms.
  • the time frame is also referred to as a D field, which is shown in FIG. 2 and is assigned to a physical layer of the DECT system, the so-called physical layer (PHL).
  • the ISO 7-layer model defines several layers.
  • One of these layers is the physical layer (PHL).
  • Another layer is a Medium Access Control Layer (MACL), to which an A field and B field are assigned according to FIG.
  • the A field includes z. B. 64 bits, while the B field z. B. is 324 bits long.
  • the DECT standard was standardized at a time when other communication technology standards, such as B. the ISDN standard were in development and thus in practical implementation. With the creation of the ISDN standard, a key goal was to apply this standard, once it was created, to standards still to be created as comprehensively as possible.
  • a DECT system also functions as an intermediate system in must take over with regard to ISDN systems.
  • a DECT system z. B. a mobile radio system and as an ISDN system such. B. serve a private switching system.
  • the DECT system consisting of an air interface (Common Air Interface), is operated via the respective DECT unit, which, for. B. includes a bound DECT subunit (DECT Fixed System) and a mobile DECT subunit (DECT Portable Terminal), coupled to the ISDN system.
  • This coupling (link) is shown in principle in FIG. 4.
  • the connection between the DECT units within the DECT system is realized via a user channel (I channel) and a signaling channel (C channel).
  • I channel user channel
  • C channel signaling channel
  • the signaling or C channel is divided into a slow C channel (C channel with "s for slow") and a fast C channel (C f channel with "f for fast”) .
  • the DECT unit has the task of converting protocols, formats and encodings that are used in the DECT system into corresponding protocols, formats and encodings that are used in the ISDN system.
  • the DECT unit has, inter alia, a cooperation unit (Interworki ⁇ g Unit), which decisively determines the flexibility of the DECT system.
  • the DECT unit is connected to a network (network) and a terminal (ISDN terminal) of the ISDN system, as specified in the ISDN standard, via two user channels (B channel), each with a transmission rate of 64 kbit / s and a signaling channel (D channel) with a transmission rate of 16 kbit / s.
  • B channel user channels
  • D channel signaling channel
  • These three channels in the ISDN system are used in parallel and, in contrast to the DECT system, are completely transparent at the same time.
  • information to be transmitted is transmitted in the ISDN system on the bit level mli: t using the time division multiplex method.
  • the C channel, C f channel and I channel which in addition to a further P channel and Q channel are also logic channels are multiplexed onto the physical channels (physical channels) in the MAC layer (medium access control).
  • the physical channels physical channels
  • the MAC layer medium access control
  • 48 bits of the A field according to FIGS. 5 and 3 are available in addition to the P channel and Q channel, in particular the C channel.
  • CRC Cycle Redundancy Check
  • the format of the B field shown in FIG. 5 is referred to as the "fill slot format", in which the format of the B field, unlike the A field, is unprotected. Should the format of the B field also be protected, i.e. H. a cyclical redundancy or validity check is also carried out for the B field. leads to a format for the B field according to FIG. 6, according to which the B field is divided into sub-areas B0 ... B3 with a 64-bit data block and 16-bit CRC block.
  • a first approach to solving this problem is to increase the "fill slot format" of the B field in a known manner and thereby at least once to adapt the transmission rate of 32 kbit / s on the I-channel or C - channel to the transmission rate of 64 kbit / s on the B-channel of the ISDN system.
  • the B field has been enlarged in accordance with FIG. 7 to an extent which allows a capacity of 80 kbit / s to be transmitted within the B field of the DECT system.
  • the useful data and signaling data are transmitted one after the other. So z. B.
  • user data transmitted on the B channel of the ISDN system are transmitted on the I channel of the DECT system and then signaling data transmitted on the D channel of the ISDN system are transmitted on the C ⁇ channel.
  • the object of the invention is to provide a method for structuring a B-field format in the DECT standard so that the outband signaling (outband signaling) implemented in the ISDN standard is supported.
  • FIG. 8 shows, in order to implement the outband signaling in the DECT system, a B field modified in comparison to the B field according to FIG. 7 in the "double slot format" with a first B subfield B ⁇ and a second B subfield B s2 .
  • the B subfield B- comprises 160 bits, 128 bits of which are available to the C ⁇ channel. The remaining 32 bits can in turn be used for cyclic redundancy or validity checking, as in the division in the A field.
  • the B-subfield B- 2 comprises 640 bits that are completely available to the I-channel.
  • the information transmitted on the D channel and B channel of the ISDN system can be transmitted simultaneously on the C ⁇ channel and I channel of the DECT system become.
  • the outband signaling (outband signaling) implemented in the ISDN system is also completely suppressed by the DECT system.
  • the B field can also be protected by a cyclical redundancy or validity check (protected format). In return, this also reduces the transmission rate of the information that can actually be used.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

The invention calls for the simultaneous incorporation of a Cf channel and an I channel in the B-field format of a DECT system, thus enabling data transmitted separately on a D channel and a B channel in an ISDN system also to be transmitted simultaneously and separately in a DECT system. This makes in particular the outband signalling possible in ISDN-standard systems also possible in DECT systems.

Description

Verfahren zur Strukturierung eines B-Feld Formates im DECT-StandardProcess for structuring a B-field format in the DECT standard

Die Erfindung betrifft ein Verfahren zur Strukturierung eines B-Feld Formates im DECT-Standard gemäß dem Oberbe¬ griff des Patentanspruches 1.The invention relates to a method for structuring a B-field format in the DECT standard according to the preamble of claim 1.

Um die technische Entwicklung schnurloser Telefonsysteme im Sinne verbesserter Kompatibilität zu steuern, ist in der Kommunikationstechnik analog zu dem bereits seit län¬ gerem bestehenden ISDN-Standard (Integrated Services Digi- tal Network) für drahtgebundene Kommunikationssysteme für die schnurlose Übertragung von Sprach- und Nichtsprachin- formationen ebenfalls ein Standard, der sogenannte DECT- Standard (Digital European Cordless Telecommunication), geschaffen worden (DECT Reference Document Version 2.1; DTR-RES 3001). In dem DECT-Standard sind dabei eine Viel¬ zahl von Kommunikationsdienstleistungen, z. B. im privaten und Geschäftsbereich, berücksichtigt. Der DECT-Standard ist für leistungsschwache schnurlose Kommunikationsüber¬ tragungen zwischen mobilen Geräten (Portables) und- der sie umgebenden Infrastruktur für Reichweiten von einigen 100 Metern ausgelegt. Für diese schnurlose Kommunikationsüber¬ tragung wird gemäß dem DECT-Standard eine dynamische Ka¬ nalauswahl von ca. 120 verfügbaren Kanälen durchgeführt. Die 120 Kanäle ergeben sich daraus, daß bei dem DECT-Stan- dard zehn Frequenzbänder zwischen 1,8 und 1,9 GHz verwen¬ det werden, wobei in jedem Frequenzband gemäß der Darstel¬ lung in Figur 1 im Zeitmultiplex (TDMA = Time Devision Multiple Access) mit einem Zeitmultiplexrahmen von 10 ms gearbeitet wird. In diesen Zeitmultiplexrahmen werden 24 (von 0 bis 23) Zeitkanäle definiert und dadurch ein Rah¬ menschema vorgegeben. Dieses Rahmenschema wird dann derart benutzt, daß für jedes Frequenzband zwölf Stationen eines DECT-Systems gleichzeitig im Duplexbetrieb arbeiten. Den 24 Zeitkanälen wird dabei ein Zeitschlitz (Time Slot) von ca. 417 μs zugeordnet. Dieser Zeitschlitz gibt die Zeit an, in der tatsächlich Informationen (Daten) übertragen werden. Dieses Übertragen der Informationen im Duplexbe¬ trieb wird auch als Ping-Pong-Verfahren bezeichnet, weil zu einem bestimmten Zeitpunkt gesendet und zu einem ande¬ ren Zeitpunkt empfangen wird. Bei diesem Ping-Pong-Verfah- ren wird in jedem Zeitschlitz ein Zeitrahmen oder Impuls (Burst) von ca. 365 μs, was in etwa einer Rahmenlänge von 420 Bits entspricht, übertragen. Die zeitliche Aufeinan¬ derfolge der übertragenen Impulse definiert einen Kanal (den sogenannten Physical Channel) mit einem Datendurch- satz von 42 kbit/s oder 420 bit/10 ms. Der Zeitrahmen wird aber auch als D-Feld bezeichnet, das in Figur 2 darge¬ stellt ist und einer physikalischen Schicht des DECT-Sy¬ stems, dem sogenannten Physical Layer (PHL), zugeordnet wird. Im DECT-Standard sind, wie beim ISDN-Standard, mit dem ISO 7-Schichtenmodell mehrere Schichten (Layer) defi¬ niert. Eine dieser Schichten ist der Physical Layer (PHL). Eine weitere Schicht ist ein Medium Access Control Layer (MACL), dem gemäß Figur 3 ein A-Feld und B-Feld zugeordnet sind. Das A-Feld umfaßt dabei z. B. 64 Bit, während das B-Feld z. B. 324 Bit lang ist.In order to control the technical development of cordless telephone systems in terms of improved compatibility, communication technology is analogous to the ISDN standard (Integrated Services Digital Network) for wire-bound communication systems for the wireless transmission of voice and non-voice signals, which has existed for some time. a standard, the so-called DECT standard (Digital European Cordless Telecommunication), was created (DECT Reference Document Version 2.1; DTR-RES 3001). The DECT standard includes a variety of communication services, e.g. B. in private and business. The DECT standard is designed for low-performance cordless communication transmissions between mobile devices (portables) and the surrounding infrastructure for ranges of a few 100 meters. For this cordless communication transmission, a dynamic channel selection of approximately 120 available channels is carried out in accordance with the DECT standard. The 120 channels result from the fact that ten frequency bands between 1.8 and 1.9 GHz are used in the DECT standard, with time division multiplexing (TDMA = Time Devision) in each frequency band as shown in FIG Multiple access) with a time division multiplex frame of 10 ms. 24 (from 0 to 23) time channels are defined in this time-division multiplex frame, thereby specifying a frame scheme. This framework will then be like this uses that for each frequency band twelve stations of a DECT system work simultaneously in duplex mode. A time slot of approx. 417 μs is assigned to the 24 time channels. This time slot indicates the time in which information (data) is actually transmitted. This transmission of the information in duplex mode is also referred to as a ping-pong method because transmission takes place at a certain point in time and reception at another point in time. With this ping-pong method, a time frame or pulse (burst) of approx. 365 μs, which corresponds to a frame length of 420 bits, is transmitted in each time slot. The chronological sequence of the transmitted pulses defines a channel (the so-called physical channel) with a data throughput of 42 kbit / s or 420 bit / 10 ms. However, the time frame is also referred to as a D field, which is shown in FIG. 2 and is assigned to a physical layer of the DECT system, the so-called physical layer (PHL). In the DECT standard, as with the ISDN standard, the ISO 7-layer model defines several layers. One of these layers is the physical layer (PHL). Another layer is a Medium Access Control Layer (MACL), to which an A field and B field are assigned according to FIG. The A field includes z. B. 64 bits, while the B field z. B. is 324 bits long.

Der DECT-Standard wurde zu einer Zeit standardisiert als bereits andere Standards der Kommunikationstechnik, wie z. B. der ISDN-Standard, in der Entwicklung und somit in der praktischen Implementierung waren. Mit der Schaffung des ISDN-Standards bestand ein Schlüsselziel darin, diesen einmal geschaffenen Standard auch auf noch zu schaffende Standards so umfassend wie möglich anzuwenden.The DECT standard was standardized at a time when other communication technology standards, such as B. the ISDN standard were in development and thus in practical implementation. With the creation of the ISDN standard, a key goal was to apply this standard, once it was created, to standards still to be created as comprehensively as possible.

Für den DECT-Standard bedeutete dies, daß gemäß Figur 4 ein DECT-System auch die Funktion eines Zwischensystems in bezug auf ISDN-Systeme übernehmen muß. Als DECT-System kann z. B. ein Mobilfunksystem und als ISDN-System z. B. ein privates Vermittlungssystem dienen. Das DECT-System, bestehend aus einer Luftschnittstelle (Common Air Inter- face), wird über die jeweilige DECT-Einheit, die z. B. ei¬ ne gebundene DECT-Teileinheit (DECT-Fixed System) und eine mobile DECT-Teileinheit (DECT-Portable Terminal) umfaßt, mit dem ISDN-System gekoppelt. Diese Kopplung (Link) ist in der Figur 4 prinzipiell dargestellt. Die Verbindung zwischen den DECT-Einheiten innerhalb des DECT-Systems ist dabei über einen Nutzkanal (I-Kanal) und einen Signalisie- rungskanal (C-Kanal) realisiert. Der Signalisierungs- oder C-Kanal wird dabei in dem DECT-Standard in einen langsamen C-Kanal (C -Kanal mit "s für slow") und einen schnellen C-Kanal (Cf-Kanal mit "f für fast") unterteilt. Die DECT- Einheit wiederum hat die Aufgabe, Protokolle, Formate und Codierungen, die in dem DECT-System benutzt werden, in entsprechende Protokolle, Formate und Codierungen, die in dem ISDN-System benutzt werden, umzuwandeln. Die DECT-Ein- heit weist dazu u. a. eine Zusammenarbeitseinheit (Inter- workiπg Unit) auf, die maßgeblich die Flexibilität des DECT-Systems mitbestimmt.For the DECT standard, this means that, according to FIG. 4, a DECT system also functions as an intermediate system in must take over with regard to ISDN systems. As a DECT system z. B. a mobile radio system and as an ISDN system such. B. serve a private switching system. The DECT system, consisting of an air interface (Common Air Interface), is operated via the respective DECT unit, which, for. B. includes a bound DECT subunit (DECT Fixed System) and a mobile DECT subunit (DECT Portable Terminal), coupled to the ISDN system. This coupling (link) is shown in principle in FIG. 4. The connection between the DECT units within the DECT system is realized via a user channel (I channel) and a signaling channel (C channel). In the DECT standard, the signaling or C channel is divided into a slow C channel (C channel with "s for slow") and a fast C channel (C f channel with "f for fast") . The DECT unit, in turn, has the task of converting protocols, formats and encodings that are used in the DECT system into corresponding protocols, formats and encodings that are used in the ISDN system. For this purpose, the DECT unit has, inter alia, a cooperation unit (Interworkiπg Unit), which decisively determines the flexibility of the DECT system.

Die Verbindung der DECT-Einheit zu einem Netzwerk (Net- work) und einem Endgerät (ISDN-Terminal) des ISDN-Systems erfolgt, wie im ISDN-Standard festgelegt, über zwei Nutz¬ kanäle (B-Kanal) mit je einer Übertragungsrate von 64 kbit/s und einem Signalisierungskanal (D-Kanal) mit ei¬ ner Übertragungsrate von 16 kbit/s. Diese drei Kanäle im ISDN-System werden parallel eingesetzt und sind dadurch im Unterschied zum DECT-System gleichzeitig völlig transpa¬ rent vorhanden. Im Unterschied zum DECT-System werden zu übertragende Informationen im ISDN-System in der Bitebene mli:t dem Zeitmultiplexverfahren übertragen.The DECT unit is connected to a network (network) and a terminal (ISDN terminal) of the ISDN system, as specified in the ISDN standard, via two user channels (B channel), each with a transmission rate of 64 kbit / s and a signaling channel (D channel) with a transmission rate of 16 kbit / s. These three channels in the ISDN system are used in parallel and, in contrast to the DECT system, are completely transparent at the same time. In contrast to the DECT system, information to be transmitted is transmitted in the ISDN system on the bit level mli: t using the time division multiplex method.

Damit Informationen innerhalb des DECT-Systems auf dem C -Kanal, C--Kanal und I-Kanal übertragen werden können, werden gemäß dem DECT-Standard der C -Kanal, Cf-Kanal und I-Kanal, die neben einem weiteren P-Kanal und Q-Kanal auch als Logikkanäle bezeichnet werden, in der MAC-Schicht (Me- dium Access Control) auf die physikalischen Kanäle (Physi¬ cal Channels) gemultiplext. Dabei stehen 48 Bit des A-Fel- des nach Figur 5 und 3 neben dem P-Kanal und Q-Kanal ins¬ besondere dem C -Kanal zur Verfügung, während die übrigen 16 Bit z. B. im Rahmen einer Fehlererkennung und -korrek- tur für eine zyklischen Redundanz- oder Gültigkeitsüber¬ prüfung (CRC = Cycle Redundancy Check) vorgesehen sind. Man spricht in diesem Fall auch von einem geschützten For¬ mat (Protected Format) des A-Feldes bzw. des C -Kanals.So that information within the DECT system on the C channel, C channel and I channel can be transmitted, according to the DECT standard, the C channel, C f channel and I channel, which in addition to a further P channel and Q channel are also logic channels are multiplexed onto the physical channels (physical channels) in the MAC layer (medium access control). In this case, 48 bits of the A field according to FIGS. 5 and 3 are available in addition to the P channel and Q channel, in particular the C channel. B. within the scope of an error detection and correction for a cyclical redundancy or validity check (CRC = Cycle Redundancy Check) are provided. In this case, one also speaks of a protected format (Protected Format) of the A field or the C channel.

Für den I-Kanal und C~-Kanal verbleiben somit bis auf vier Bit, die einem X-Feld zugeordnet werden, 320 Bit des B-Feldes. Das in der Figur 5 dargestellte Format des B-Feldes wird als "Füll Slot Format" bezeichnet, bei dem das Format des B-Feldes im Unterschied zum A-Feld unge- schützt ist. Soll das Format des B-Feldes ebenfalls ge¬ schützt, d. h. es wird für das B-Feld ebenfalls eine zy¬ klische Redundanz- oder Gültigkeitsüberprüfung durchge-. führt, dann ergibt sich für das B-Feld ein Format gemäß Figur 6, nach der das B-Feld in Subbereiche B0...B3 mit einem 64 Bit Datenblock und 16 Bit CRC-Block unterteilt ist.For the I channel and C ~ channel, 320 bits of the B field remain except for four bits which are assigned to an X field. The format of the B field shown in FIG. 5 is referred to as the "fill slot format", in which the format of the B field, unlike the A field, is unprotected. Should the format of the B field also be protected, i.e. H. a cyclical redundancy or validity check is also carried out for the B field. leads to a format for the B field according to FIG. 6, according to which the B field is divided into sub-areas B0 ... B3 with a 64-bit data block and 16-bit CRC block.

Für die Koppelung des ISDN-Systems mit dem DECT-System nach Figur 4 stellt sich nun das Problem, wie die auf der quasi kontinuierlichen Kanalstruktur des ISDN-Systems übertragenen Daten (Informationen) innerhalb des DECT-Sy¬ stems übertragen werden können.For the coupling of the ISDN system with the DECT system according to FIG. 4, the problem now arises of how the data (information) transmitted on the quasi-continuous channel structure of the ISDN system can be transmitted within the DECT system.

Ein erster Ansatz für die Lösung dieses Problems besteht nun darin, das "Füll Slot Format" des B-Feldes in bekann¬ ter Weise zu vergrößern und dadurch zumindest schon einmal die Übertragungsrate von 32 kbit/s auf dem I-Kanal bzw. C--Kanal der Übertragungsrate von 64 kbit/s auf dem B-Ka- nal des ISDN-Systems anzupassen.A first approach to solving this problem is to increase the "fill slot format" of the B field in a known manner and thereby at least once to adapt the transmission rate of 32 kbit / s on the I-channel or C - channel to the transmission rate of 64 kbit / s on the B-channel of the ISDN system.

Das B-Feld ist dabei gemäß Figur 7 in einem Umfang vergrö¬ ßert worden, der es erlaubt, innerhalb des B-Feldes des DECT-Systems eine Kapazität von 80 kbit/s zu übertragen. Bei der im DECT-Standard vorgesehenen Art der Übertragung von Informationen (Daten) werden die Nutz- und Signalisie- rungsdaten im Unterschied zum ISDN-System zeitlich nach¬ einander übertragen. So werden z. B. zuerst auf dem B-Ka- nal des ISDN-System übertragene Nutzdaten auf dem I-Kanal des DECT-Systems und anschließend auf dem D-Kanal des ISDN-Systems übertragene Signalisierungsdatgen auf dem C~-Kanal übertragen. Durch diese inbesondere auf dem B-Ka- nal und I-Kanal unterbrochenen Übertragungen ergeben sich Übertragungsfehler und Störgeräusche. Es sind deshalb we¬ gen des Prinzips der synchronen Übertragung von Informa¬ tionen bei dieser Art der Übertragung Füllbits (Fill Bits) erforderlich, die jedoch von dem die Information enthalte¬ nen Bitstrom nicht separiert werden können. Um dieses Pro¬ blem zu vermeiden, muß eine im ISDN-Standard vorgesehene Außenband-Signalisierung (Outband Signalling) auch im DECT-Standard eingeführt werden. Dazu müssen aber im DECT- System, basierend auf die bekannte Vorstellung, das Format des B-Feldes zu vergrößern, weitere Modifikationen vorge¬ nommen werden.The B field has been enlarged in accordance with FIG. 7 to an extent which allows a capacity of 80 kbit / s to be transmitted within the B field of the DECT system. In the case of the type of transmission of information (data) provided in the DECT standard, in contrast to the ISDN system, the useful data and signaling data are transmitted one after the other. So z. B. First, user data transmitted on the B channel of the ISDN system are transmitted on the I channel of the DECT system and then signaling data transmitted on the D channel of the ISDN system are transmitted on the C ~ channel. These transmissions, which are particularly interrupted on the B-channel and I-channel, result in transmission errors and noise. Because of the principle of the synchronous transmission of information, fill bits are required for this type of transmission, but cannot be separated from the bit stream containing the information. To avoid this problem, outband signaling provided in the ISDN standard must also be introduced in the DECT standard. For this purpose, however, further modifications have to be made in the DECT system based on the known idea of increasing the format of the B field.

Aufgabe der Erfindung ist es, ein Verfahren zur Struktu- rierung eines B-Feld Formates im DECT-Standard anzugeben, so daß die im ISDN-Standard realisierte Außenband-Signali- sierung (Outband Signalling) unterstützt wird.The object of the invention is to provide a method for structuring a B-field format in the DECT standard so that the outband signaling (outband signaling) implemented in the ISDN standard is supported.

Diese Aufgabe wird durch die in dem Patentanspruch 1 ange- gebenen Merkmale gelöst. Dadurch, daß ein C~-Kanal zusammen mit einem I-Kanal in das B-Feld eines DECT-Systems (DECT-Standard) eingebunden wird, werden innerhalb des DECT-Systems Übertragungen auf dem D-Kanal eines mit dem DECT-System verbundenen ISDN-Sy- stems ohne jegliche Protokoll-Einschränkungen für eine ISDN/DECT-Verbindung und bei einem einfachen Entwurf einer DECT-Einheit, insbesondere einer Zusammenarbeitseinheit (Interworkung Unit), minimal verzögert. Dadurch ist eine optimale Anpassung der Übertragungsrate von Informationen (Daten) auf C~-Kanal des DECT-Systems an die Übertragungs¬ rate der Informationen (Daten) auf dem D-Kanal des ISDN- Systems möglich.This object is achieved by the features specified in patent claim 1. Because a C ~ channel is integrated together with an I channel in the B field of a DECT system (DECT standard), transmissions on the D channel are connected to the DECT system within the DECT system ISDN systems without any protocol restrictions for an ISDN / DECT connection and with a simple design of a DECT unit, in particular a collaboration unit (Interworking Unit), are minimally delayed. This enables an optimal adaptation of the transmission rate of information (data) on the C ~ channel of the DECT system to the transmission rate of the information (data) on the D channel of the ISDN system.

Vorteilhafte Weiterbildungen der Erfindung sind in den Un- teransprüchen angegeben.Advantageous developments of the invention are specified in the subclaims.

Ein Ausführungsbeispiel der Erfindung wird anhand der Fi¬ gur 8 erläutert.An embodiment of the invention is explained with reference to FIG. 8.

Figur 8 zeigt zur Realisierung der Außenband-Signalisie¬ rung (Outband Signalling) im DECT-System ein gegenüber dem B-Feld nach Figur 7 modifiziertes B-Feld im "Double Slot Format" mit einem ersten B-Subfeld Bς, und einem zweiten B-Subfeld Bs2. Das B-Subfeld B-, umfaßt 160 Bits, von de- nen 128 Bit dem C~-Kanal zur Verfügung stehen. Die restli¬ chen 32 Bit können wiederum, wie bei der Aufteilung in dem A-Feld zur zyklischen Redundanz- oder Gültigkeitsüberprü¬ fung verwendet werden. Das B-Subfeld B-2 umfaßt 640 Bit, die vollständig dem I-Kanal zur Verfügung stehen. Durch die Aufteilung des B-Feldes in zwei B-Subfelder Bsl, B_2 können die auf den D-Kanal und B-Kanal des ISDN-Systems übertragenen Informationen auf den C~-Kanal und I-Kanal des DECT-Systems simultan übertragen werden. Durch diese simultane Übertragung der Informationen wird die in dem ISDN-System realisierte Außenband-Signalisierung (Outband Signalling) auch von dem DECT-System vollständig unter- stützt. Analog zum A-Feld kann das B-Feld ebenfalls durch eine zyklische Redundanz- oder Gültigkeitsüberprüfung ge¬ schützt werden (Protected Format). Dadurch wird im Gegen¬ zug aber auch die Übertragungsrate der effektiv nutzbaren Informationen reduziert. FIG. 8 shows, in order to implement the outband signaling in the DECT system, a B field modified in comparison to the B field according to FIG. 7 in the "double slot format" with a first B subfield B ς and a second B subfield B s2 . The B subfield B- comprises 160 bits, 128 bits of which are available to the C ~ channel. The remaining 32 bits can in turn be used for cyclic redundancy or validity checking, as in the division in the A field. The B-subfield B- 2 comprises 640 bits that are completely available to the I-channel. By dividing the B field into two B subfields B sl , B_ 2 , the information transmitted on the D channel and B channel of the ISDN system can be transmitted simultaneously on the C ~ channel and I channel of the DECT system become. As a result of this simultaneous transmission of the information, the outband signaling (outband signaling) implemented in the ISDN system is also completely suppressed by the DECT system. supports. Analogous to the A field, the B field can also be protected by a cyclical redundancy or validity check (protected format). In return, this also reduces the transmission rate of the information that can actually be used.

Claims

Patentansprüche Claims 1. "Verfahren zur Strukturierung eines B-Feld Formates im DECT-Standard, bei dem dem B-Feld Format des DECT-Stan- dards ein an einem B- und D-Kanal im ISDN-Standard orien¬ tierter Zeitschlitzrahmen zugeordnet wird, d a d u r c h g e k e n n z e i c h n e t , daß in dem B-Feld Format gleichzeitig auf einem Nutz- und Signalisierungskanal des DECT-Standards übertragbare Informationen übertragen wer- den, indem dem Nutzkanal des DECT-Standards ein erstes Subfeld (Bς,) des B-Feld Formats mit einem ersten, an den B-Kanal des ISDN-Standards orientierten Subzeitschlitzrah- men und dem Signalisierungskanal des DECT-Standards ein zweites SubFeld (Bς2) des B-Feld Formats mit einem zwei- ten, an den D-Kanal des ISDN-Standards orientierten Sub- zeitschlitzrahmen zugeordnet werden.1. " Method for structuring a B-field format in the DECT standard, in which the B-field format of the DECT standard is assigned a time slot frame oriented to a B and D channel in the ISDN standard, characterized that, in the B-field format, information that can be transmitted is transmitted simultaneously on a user and signaling channel of the DECT standard, in that a first sub-field (B ς ,) of the B-field format with a first, a second sub-field (B ς2 ) of the B-field format with a second sub-field oriented to the D-channel of the ISDN standard, based on the B-channel of the ISDN standard and the signaling channel of the DECT standard time slot frames can be assigned. 2. Verfahren nach Anspruch 1, d a d u r c h g e k e n n ¬ z e i c h n e t , daß ein in dem zweiten Subfeld BS2N des B-Feld Formats übertragener redundanter Anteil der In¬ formationen mindestens zur Fehlererkennung verwendet wird.2. The method according to claim 1, characterized in that a redundant portion of the information transmitted in the second subfield B S2 N of the B field format is used at least for error detection. 3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n ¬ z e i c h n e t , daß der in dem zweiten Subfeld (BS2) des B-Feld Formats übertragene redundante Anteil der In¬ formation zur Fehlerkorrektur verwendet wird.3. The method according to claim 2, characterized in that the redundant portion of the information transmitted in the second sub-field (B S2 ) of the B-field format is used for error correction. 4. Verfahren nach einem der Ansprüche 1 bis 3, d a - d u r c h g e k e n n z e i c h n e t , daß die in dem ersten Subfeld Bs,) des B-Feld Formats übertragene Information ungeschützt übertragen wird.4. The method according to any one of claims 1 to 3, since - characterized in that the information transmitted in the first subfield B s ,) of the B field format is transmitted unprotected. 5. Verfahren nach einem der Ansprüche 1 bis 4, d a - d u r c h g e k e n n z e i c h n e t , daß der zweite Subzeitschlitzrahmen des zweiten Subfeldes (Bς2) verklei¬ nert wird, um den ersten Subzeitschlitzrahmen des ersten Subfeldes (Bς,) und dadurch den Informationsdurchsatz des dem ersten Subfeld (Bsl) des B-Feld Formats zugeordneten Nutzkanals des DECT-Standards zu erhöhen. 5. The method according to any one of claims 1 to 4, since - characterized in that the second sub-time slot frame of the second subfield (B ς2 ) is reduced by the first sub-time slot frame of the first Subfield (B ς ,) and thereby increase the information throughput of the DECT standard user channel assigned to the first subfield (B sl ) of the B-field format.
EP93906447A 1992-04-09 1993-03-25 Method of structuring a b-field format in a dect-standard system Ceased EP0635185A1 (en)

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