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Communication system

A technology for sending signals and information, applied in the field of information transmission systems, can solve problems such as undetectable

Inactive Publication Date: 2005-01-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that a relatively weak signal received at a receiver connected to the system controller may be suppressed by a very strong signal and lead to undetectable consequences

Method used

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Embodiment Construction

[0030] refer to figure 1 The paging system includes a paging system controller 10 connected to at least one base transceiver station 12, if required by a landline or other suitable link. Where there is more than one base transceiver station, they can be geographically separated and can operate in a quasi-synchronous mode.

[0031] Selective call receivers or slave stations SS1, SS2 are provided, each of them comprising a limited number of types capable of receiving transmissions from transceiver 12 and capable of transmitting, including acknowledgments, at an effective power lower than the output power of transceiver 12, such as 30 dB. type of message transceiver. The typical information rate of transmitted spread spectrum information is one thousandth of that transmitted by transceiver 12, and the length of the spreading sequence is 10 4 The order of magnitude, for example 8191 chips per bit.

[0032] According to the present invention, the paging system controller 10 atte...

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PUM

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Abstract

A selective call system including a system controller, a base station transceiver and a plurality of secondary stations with receivers and low powered transmitters capable of sending spread spectrum signals. Invitations are issued to the secondary stations by the system controller at varying power levels. Only those secondary stations receiving the invitation signal are able to respond. Those secondary stations too far away cannot respond to a low power invitation, and since each secondary station can only respond once, upon a received invitation of increased power, such outer lying secondary stations can respond without interference from closer lying secondary stations.

Description

[0001] This application is a divisional application of the patent application whose application number is 95191622.X. technical field [0002] The present invention relates to a selective calling system, in particular but not exclusively to an information transmission system for transmitting long data messages and / or television scripts. Background technique [0003] PCT patent specification WO94 / 28685 discloses a paging system adapted to transmit long data messages at a rate higher than currently generally used, which system is an enhancement of CCIR Radiopaging Code No1 also known as POCSAG paging code and Compatible with it. This enhanced paging system, referred to by applicants as the Advanced Paging Operation Code (APOC), provides for the transmission of address codewords and concatenated information codewords in a period of 6.8 seconds. Each period consists of multiple batches, eg 3 batches of equal period. Each batch includes a synchronization (sync) codeword and con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04W84/02H04W88/02
CPCH04W84/025H04W88/022Y02B60/50Y02D30/70
Inventor R·W·吉布森
Owner KONINKLIJKE PHILIPS ELECTRONICS NV