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EP0225643A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Channel switching system

Assignee: NEC Corp
•
Filing: 1986-12-10
•
Granted: —
•
Expires: 2006-12-10
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Abstract

Abstract In a digital radio communication system using at least two regular channel and two or more standby channels for transmitting a test signal therethrough in the standby condition thereby permitting the regular channel to be synchronously switched to one of the standby channels, the improvement wherein a channel switching system for monitoring the standby channels is provided at the receiving side of the digital communication system with: control signal generator means operating so that when two or more standby channels are in standby condition, it generates a control signal to designate them in turn, and when only one standby channel is in standby condition, it generates a control signal to designate the channel; synchronizing switching means for selectively outputting the test signal transmitted via each of the standby channels designated by the control signal; and standby channel monitoring means for detecting an output from the synchronizing switching means to monitor the communication quality of the standby channel placed in standby condition on the basis of the result detected.

Inventors

  • 👤 Hideaki C/O Nec Corporation Morimoto
  • 👤 Kiyoshi C/O Nec Corporation Funayama

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 14:54
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/74

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 161 words
A channel switching system in a digital radio communication system using at least two regular channel and two or more standby channels for transmitting a test signal therethrough in the standby'condition, thereby permitting said regular channel to be synchronously switched to one of said standby channels, said channel switching system comprising at the receiving side of said digital communication system: control signal generator means operating so that when two or more standby channels are in standby condition it generates a control signal to designate them in turn, and when only one standby channel is in standby condition, it generates a control signal to designate the channel, synchronizing switching means for selectively outputting said test signal transmitted via each of said standby channels designated by said control signal, and standby channel monitoring means for detecting an output from said synchronizing switching means to monitor the communication quality of the standby channel placed in standby condition on the basis of the result detected.
Claim 2
Dependent Claim 161 words
A channel switching system in a digital radio communication system using at least two regular channel and two or more standby channels for transmitting a test signal therethrough in the standby'condition, thereby permitting said regular channel to be synchronously switched to one of said standby channels, said channel switching system comprising at the receiving side of said digital communication system: control signal generator means operating so that when two or more standby channels are in standby condition it generates a control signal to designate them in turn, and when only one standby channel is in standby condition, it generates a control signal to designate the channel, synchronizing switching means for selectively outputting said test signal transmitted via each of said standby channels designated by said control signal, and standby channel monitoring means for detecting an output from said synchronizing switching means to monitor the communication quality of the standby channel placed in standby condition on the basis of the result detected.
Claim 3
Dependent Claim 25 words
A channel switching system as claimed in claim l, characterized by delay adjusting means for compensating a fixed delay difference between said mutual standby channels.
Claim 4
Dependent Claim 41 words
A channel switching system as claimed in claim 1 or 2, characterized by a frame synchronizing means provided on each of said regular channel and said standby channels at the input portion of said receiving side of said digital communication system.
Claim 5
Dependent Claim 28 words
A channel switching system as Claimed in claim 3, characterized in that the delay adjusting means is provided between said synchronizing switching means and said frame synchronizing means.

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