Global Patent Index - EP 0832538 A4

EP 0832538 A4 2000-05-10 - DUAL CHANNEL DUAL SPEED FM SUBCARRIER PAGING SYSTEM

Title (en)

DUAL CHANNEL DUAL SPEED FM SUBCARRIER PAGING SYSTEM

Title (de)

FM-UNTERTRÄGER-PERSONENRUFSYSTEM MIT ZWEI KANÄLEN UND ZWEI GESCHWINDIGKEITEN

Title (fr)

SYSTEME D'APPEL DE PERSONNES A DEUX VITESSES UTILISANT DEUX CANAUX F.M. ET DES SOUS-PORTEUSES

Publication

EP 0832538 A4 (EN)

Application

EP 96917201 A

Priority

  • US 9608951 W
  • US 47715095 A

Abstract (en)

[origin: WO9641489A1] The effective transmission range of a wireless paging system is varied by changing the transmission data rate. Signal (31) is transmitted at a fast data rate to receivers (26) in a small transmission range (18) from transmitter (28). Signal (30) is transmitted at a slower data rate so that a receiver (26) can reliably receive messages over a larger transmission range (32) from the transmitter (28) for sparse transmitter coverage. The dual transmission data rates are transmitted either on separate subcarriers on the same FM channel, on the same subcarrier of different FM channels or alternatively on different subcarriers of different FM channels. In a region with dense transmission coverage, the receiver decodes transmission messages at the faster transmission data rate. In regions with sparse transmission coverage, the receiver decodes messages at the slower data rate.

IPC 1-7 (main, further and additional classification)

H04Q 7/14; H04Q 7/18

IPC 8 full level (invention and additional information)

H04W 88/02 (2009.01)

CPC (invention and additional information)

H04W 88/026 (2013.01)

Citation (search report)

  • [A] ANDERSON H R ET AL: "A TECHNIQUE FOR DIGITAL INFORMATION BROADCASTING USING SCA CHANNELS", IEEE TRANSACTIONS ON BROADCASTING,US,IEEE INC. NEW YORK, vol. BC-27, no. 4, December 1981 (1981-12-01), pages 65 - 70, XP000762733, ISSN: 0018-9316
  • See also references of WO 9641489A1

Designated contracting state (EPC)

DE FR GB NL

EPO simple patent family

WO 9641489 A1 19961219; AU 5986096 A 19961230; CA 2219215 A1 19961219; CA 2219215 C 20070925; EP 0832538 A1 19980401; EP 0832538 A4 20000510; JP 3805369 B2 20060802; JP H11507187 A 19990622

INPADOC legal status


2000-06-21 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20000427

2000-05-10 [A4] SUPPLEMENTARY SEARCH REPORT

- Ref Legal Event Code: A4

- Effective date: 20000324

2000-05-10 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB NL

2000-05-10 [RIC1] CLASSIFICATION (CORRECTION)

- Ref Legal Event Code: RIC1

- Free Format Text: 7H 04Q 7/14 A, 7H 04Q 7/18 B

1998-04-01 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19971020

1998-04-01 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB NL