WO1979000110A1 - Installation de transmission avec appel selectif entre usagers par l'intermediaire d'une unite centrale - Google Patents

Installation de transmission avec appel selectif entre usagers par l'intermediaire d'une unite centrale Download PDF

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Publication number
WO1979000110A1
WO1979000110A1 PCT/DE1978/000021 DE7800021W WO7900110A1 WO 1979000110 A1 WO1979000110 A1 WO 1979000110A1 DE 7800021 W DE7800021 W DE 7800021W WO 7900110 A1 WO7900110 A1 WO 7900110A1
Authority
WO
WIPO (PCT)
Prior art keywords
code
call
call signals
signals
signal
Prior art date
Application number
PCT/DE1978/000021
Other languages
German (de)
English (en)
Inventor
H Koch
Original Assignee
Licentia Gmbh
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 Licentia Gmbh filed Critical Licentia Gmbh
Publication of WO1979000110A1 publication Critical patent/WO1979000110A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/187—Selective call encoders for paging networks, e.g. paging centre devices using digital or pulse address codes

Definitions

  • the invention relates to a radio system with wireless transmission according to the preamble of claim 1.
  • Such an AD location is described in DE-AS 1 933 700.
  • the invention has for its object to provide a radio system in which it is possible in spite of the complicated, transmission-safe coded call signals emitted by the fixed center that mobile radio subscribers themselves can call other mobile radio subscribers by means of handy, easy-to-set portable devices.
  • the invention relates to the radio system mentioned at the beginning.
  • the above object is achieved in such an Anaige by the invention reproduced in claim 1. Further developments and advantageous embodiments of the invention are specified in the subclaims.
  • the drawing shows a paging system which comprises a fixed center 23 and a plurality of paging receivers 1, 28.
  • the paging system shown is structured so that e.g. Participants in a telephone system (not shown) can selectively call the paging receivers 1, 28 via the control center 23 and can transmit certain information to them.
  • the transmitting device 46 of the control center 23 is prompted to transmit a corresponding call signal 13 via the transmitting antenna 14.
  • the call signal 13 consists of digital pulses which form different pulse groups 8 to 12.
  • a forward signal 8 of a real call signal that is to say not coincidentally reproduced by noise signals, is provided, to which the address signal 9 is connected.
  • the address signal 9 is connected.
  • the called subscriber 28 of the personal call systems is selectively determined.
  • the information to be transmitted is sent in the form of information signals 10.
  • the call signal 13 described can be checked for correctness by means of further test pulse signals 11, which are arithmetically derived from the preceding signals.
  • An end signal 12 is provided to mark the end of the call signal 13.
  • the described call signal 13 is relatively long. However, it is sufficient if it is sent out once.
  • the code used in the described call signal 13, which results from the number, type and structure of the individual pulse groups 8 to 12, is constructed in such a way that the desired transmission security is provided.
  • the call signal 13 described is received by a pager 28 by means of a receiving antenna 25 and in the receiving part 2? evaluated. This evaluation checks whether the pulse groups 8 to 12 of the call signal 13 mentioned are present and correct.
  • the Per soenanananlagen described so far is further constructed so that the paging subscriber can not only be called via the fixed center 23, but that calling the paging subscriber from a paging receiver with transmitting part is possible.
  • the paging receiver 1 has a receiving part 3, which can receive 5 call signals according to the AT of the described call signal 13 via a receive antenna.
  • the receiving part 3 and the receiving antenna 5 of the pager 1 ent speak to the receiving part 27 and the receiving antenna 25 of the pager 28.
  • the paging receiver 1 also has a transmitting part 2 and, a transmitting antenna 4. Accordingly, the paging receiver 28 also comprises a transmitting part 26 and a transmitting antenna 24.
  • a subscriber of the displayed paging system equipped with the pager 1 wants to make a selective call to another pager (e.g. 28) of the paging system, then he must call his pager, i.e. z. B. on the transmitting part 2 of his pager the address to be called pager 28 corresponding address.
  • the result of this is that 4 call signals 7 are repeatedly transmitted via the transmitting antenna 4.
  • the call signals 7 form a call telegram 6. In the exemplary embodiment shown, the call signal 7 is repeated five times automatically.
  • the call signal 7 consists of digital pulses, which merely represent the address of the subscriber to be called and, if appropriate, the information to be transmitted. Further additional signals such as a lead signal such as the call signal 13 or a test pulse signal (corresponding to the pulse group 11 of the call signal 13) are not provided for the call signal 7.
  • the code used for this call signal 7 is therefore considerably simpler than the code used for the call signal 13. The consequence of this is that the transmitting part 2 of the pager 1 can be constructed relatively simply. A call signal with a relatively complicated code like the call signal 13 would not be able to be sent out easily with a transmitting part of the pager 1, since this would require considerable additional effort.
  • the call signals 7 emitted by the pager 1 are received by the receiving antenna 15 of the control center 23.
  • the call signals 7, which are usually transmitted by means of a carrier frequency, are processed in a receiving part 17 of the control center 23 processed and evaluated.
  • a test device 18 of the control center 23 checks whether the received signal can represent a real call signal, for example in terms of its length or in terms of the type of individual pulses. If this test reveals that; the received signal is recognized as a real call signal 7, a time monitoring element 19 of the control center 23 is switched on, which checks whether the period of time during which the call signals 7 are received matches the period of time that is predetermined for five call signals 7.
  • At least two of the received call signals 7 are compared with one another in a comparison circuit 20 of the control center 23. If this comparison shows that at least two identical call signals 7 have been received, and if the time monitoring element 19 has not detected a timeout, then the call signal 7 recognized as genuine and correct is implemented in a converter 21 of the control center 23 in such a way that the converter 21 Via a control line 22 controlled transmission device 15 of the control center 23 sends out a call signal which has the complicated code of the illustrated call signal 13 described above.
  • This call signal 13 with a complicated code which is transmitted by the transmitting device 16 of the control center 23 after receiving a call signal 7 with a simple code, is received by the pager 28 to be called.
  • the transmission security of the call signal 7 constructed with a simple code can be increased in addition to the tests described or also without these tests in that the transmission speed of the call signals 7 is reduced compared to the transmission speed of the call signals 13.
  • the paging system shown works with digital pulses and digital codes; however, it is also possible to call signals 13 and 7 e.g. with a frequency division multiplex code.
  • the system described is independent of whether special information is transmitted with the selective call of the pager or whether the pager 1, 28 are also suitable for the transmission of speech.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Optical Communication System (AREA)

Abstract

Installation d'appel de personnes, avec laquelle les personnes munies d'appareils emetteurs-recepteurs (1, 28) peuvent s'appeler selectivement par l'intermediaire d'une unite centrale emettrice-receptrice (23). Afin d'obtenir des appareils portatifs legers, ceux-ci sont realises pour emettre un signal selon un code simple (7). Dans l'unite centrale sont prevus des moyens de conversion (21) pour recevoir le signal d'appel, code selon le code simple, et le convertir en un signal d'appel code selon un code de transmission sur (13).
PCT/DE1978/000021 1977-08-25 1978-08-16 Installation de transmission avec appel selectif entre usagers par l'intermediaire d'une unite centrale WO1979000110A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2738278A DE2738278C2 (de) 1977-08-25 1977-08-25 Funkanlage mit drahtloser Übertragung zwischen tragbaren Sende-Empfangs-Geräten und mit selektivem Anruf der Teilnehmer untereinander unter Zwischenschaltung einer Zentrale
DE2738278 1977-08-25

Publications (1)

Publication Number Publication Date
WO1979000110A1 true WO1979000110A1 (fr) 1979-03-08

Family

ID=6017239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1978/000021 WO1979000110A1 (fr) 1977-08-25 1978-08-16 Installation de transmission avec appel selectif entre usagers par l'intermediaire d'une unite centrale

Country Status (12)

Country Link
AT (1) AT377882B (fr)
BE (1) BE869907A (fr)
CH (1) CH625378A5 (fr)
DE (1) DE2738278C2 (fr)
FI (1) FI782557A (fr)
FR (1) FR2401578A1 (fr)
GB (1) GB2021296B (fr)
IT (1) IT1098749B (fr)
NL (1) NL7808703A (fr)
NO (1) NO149449C (fr)
SE (1) SE434590B (fr)
WO (1) WO1979000110A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108938A1 (fr) * 1982-10-15 1984-05-23 Nec Corporation Installation d'appel numérique avec changement de vitesse binaire et récepteur d'appel numérique assorti

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3315625A1 (de) * 1983-04-29 1984-10-31 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum uebertragen von digitalen rufkennzeichen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2152346A1 (fr) * 1971-09-06 1973-04-27 Materiel Telephonique
FR2278216A1 (fr) * 1974-07-11 1976-02-06 Hasler Ag Installation d'appel de personnes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1616340B2 (de) * 1968-01-25 1973-10-04 Telefunken Patentverwertungsgesellschaft Mbh, 7900 Ulm Wechselsprechanlage mit draht loser Übertragung zwischen Teilnehmern mit tragbaren Geraten über eine Zentrale
DE1931480B2 (de) * 1969-06-20 1976-03-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltung zur vorselektion von im gleichen frequenzabstand voneinander liegenden sendern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2152346A1 (fr) * 1971-09-06 1973-04-27 Materiel Telephonique
FR2278216A1 (fr) * 1974-07-11 1976-02-06 Hasler Ag Installation d'appel de personnes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS AND COMMUNICATION IN JAPAN, volume 50, no. 10, Oktober 1967, Washington; YOSHINOBU TATSUZAWA: "Experiments on pulse code selective calling radio system" Seiten 183 bis 190 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0108938A1 (fr) * 1982-10-15 1984-05-23 Nec Corporation Installation d'appel numérique avec changement de vitesse binaire et récepteur d'appel numérique assorti

Also Published As

Publication number Publication date
SE7903041L (sv) 1979-04-05
CH625378A5 (fr) 1981-09-15
BE869907A (fr) 1978-12-18
NL7808703A (nl) 1979-02-27
NO149449C (no) 1984-04-18
IT1098749B (it) 1985-09-07
DE2738278C2 (de) 1982-06-03
DE2738278A1 (de) 1979-03-01
GB2021296B (en) 1982-04-07
NO782875L (no) 1979-02-27
GB2021296A (en) 1979-03-08
FR2401578B1 (fr) 1983-05-27
SE434590B (sv) 1984-07-30
FR2401578A1 (fr) 1979-03-23
ATA577378A (de) 1984-09-15
FI782557A (fi) 1979-02-26
IT7827001A0 (it) 1978-08-24
AT377882B (de) 1985-05-10
NO149449B (no) 1984-01-09

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