CA2477548A1 - Self-monitoring radio network - Google Patents

Self-monitoring radio network Download PDF

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Publication number
CA2477548A1
CA2477548A1 CA002477548A CA2477548A CA2477548A1 CA 2477548 A1 CA2477548 A1 CA 2477548A1 CA 002477548 A CA002477548 A CA 002477548A CA 2477548 A CA2477548 A CA 2477548A CA 2477548 A1 CA2477548 A1 CA 2477548A1
Authority
CA
Canada
Prior art keywords
radio
time
window
transmission
way
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.)
Granted
Application number
CA002477548A
Other languages
French (fr)
Other versions
CA2477548C (en
Inventor
Gebran J. Sabongi
Ronald W. Hall
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.)
3M Innovative Properties Co
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2477548A1 publication Critical patent/CA2477548A1/en
Application granted granted Critical
Publication of CA2477548C publication Critical patent/CA2477548C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Abstract

A scheme of identifying nonfunctional two-way radios from among a known group of two-way radios expected to be operating within a region may include establishing a corresponding window of time for each of the two-way radios expected to be operating within the region. For each of the established windows of time, a transmission from the corresponding radio is awaited. If, for a particular radio, no transmission is detected within its corresponding window of time, the absence of the transmission is recorded. Finally, if, for a particular radio, the number of times absence of transmission has been recorded exceeds a threshold, the particular radio is identified as nonfunctional.

Claims (7)

1. A method of identifying nonfunctional two-way radios from among a known group of two-way radios expected to be operating within a region, the method comprising:
for each of the two-way radios expected to be operating within the region, establishing a corresponding window of time;
for each of the established windows of time, awaiting a transmission from the corresponding radio;
if, for a particular radio, no transmission is detected within its corresponding window of time, recording the absence of the transmission; and if, for a particular radio, the number of times absence of transmission has been recorded exceeds a threshold, identifying the particular radio as nonfunctional.
2. The method of claim 1, wherein the step of establishing a time window corresponding to each radio comprises:
for each of the two-way radios expected to be operating in the region, assigning a corresponding unique delay period;
broadcasting a query signal;
following the broadcast of the query signal, for each of the two-way radios, commencing the window of time corresponding to a particular radio, after waiting for the unique delay period assigned to the particular radio to elapse; and for each of the two-way radios, closing its corresponding window of time, after waiting for a pre-defined period to elapse.
3. The method of claim 1, wherein the step of establishing a time window corresponding to each radio comprises:
transmitting a query signal containing a code identifying a particular radio;
commencing the window of time corresponding to the particular radio, upon transmission of the query signal; and closing the window of time corresponding to the particular radio, after waiting for a pre-defined period of time to elapse.
4. The method of claim 1, wherein the step of establishing a time window corresponding to each radio comprises:
opening a window of time corresponding to all of the radios;
waiting for a predefined period to elapse; and closing the window of time.
5. The method of claim 1, wherein the step of awaiting a transmission from a radio corresponding to a window of time comprises:
receiving transmissions on a carrier frequency assigned to the radio corresponding to the window of time; and inspecting the received transmissions for presence of an identification code corresponding to the radio corresponding to the window of time.
6. A two-way radio improved so as to render its operability observable, the two-way radio comprising:
an antenna for receiving and broadcasting transmissions;
a transceiver unit coupled to the antenna for modulating a carrier signal with a signal to be transmitted and for recovering a baseband signal from a received transmission;
a microprocessor coupled to the transceiver unit, the microprocessor programmed to command a broadcast of a transmission containing a code identifying the radio, at a designated point in time; and wherein, prior to the broadcast of the transmission containing the identification code, a transmission protocol governing subsequent transmissions is known by the radio.
7. A wireless intercom system comprising:
a first two-way radio fashioned as a headset;
a second two-way radio fashioned as a headset; and a repeater unit;
wherein transmissions from the first and second two-way radio occur upon a first carrier frequency;

wherein the first and second two-way radios receive transmissions carried upon a second carrier frequency;
wherein the repeater unit receives transmission carried upon the first carrier frequency, and broadcasts transmissions upon the second carrier frequency, thereby enabling the first and second two-way radios to communicate;
wherein the repeater unit establishes a first window of time corresponding to the first radio and a second window of time corresponding to the second radio;
wherein, the repeater unit awaits a transmission from the first radio during the first window of time, and awaits a transmission from the second radio during the second window of time;
wherein, the repeater unit records absence of transmission from the first radio, if no transmission is received from the first radio during the first window of time;
wherein, the repeater unit records absence of transmission from the second radio, if no transmission is received from the second radio during the second window of time;
wherein, the repeater unit identifies the first radio as nonfunctional if the number of times absence of transmission by the first radio has been recorded exceeds a threshold;
and wherein, the repeater unit identifies the second radio as nonfunctional if the number of times absence of transmission by the second radio has been recorded exceeds a threshold.
CA2477548A 2002-02-26 2002-12-19 Self-monitoring radio network Expired - Fee Related CA2477548C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/085480 2002-02-26
US10/085,480 US6993292B2 (en) 2002-02-26 2002-02-26 Self-monitoring radio network
PCT/US2002/040968 WO2003073775A1 (en) 2002-02-26 2002-12-19 Self-monitoring radio network

Publications (2)

Publication Number Publication Date
CA2477548A1 true CA2477548A1 (en) 2003-09-04
CA2477548C CA2477548C (en) 2011-02-08

Family

ID=27753639

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2477548A Expired - Fee Related CA2477548C (en) 2002-02-26 2002-12-19 Self-monitoring radio network

Country Status (9)

Country Link
US (2) US6993292B2 (en)
EP (1) EP1479249B1 (en)
JP (1) JP4373220B2 (en)
KR (1) KR101025963B1 (en)
CN (1) CN100534231C (en)
AU (1) AU2002364094B2 (en)
CA (1) CA2477548C (en)
MX (1) MXPA04008214A (en)
WO (1) WO2003073775A1 (en)

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US20060030269A1 (en) 2006-02-09
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JP2005518771A (en) 2005-06-23
AU2002364094B2 (en) 2009-04-09
EP1479249B1 (en) 2012-08-22
CN1625906A (en) 2005-06-08
US20030162504A1 (en) 2003-08-28
US7715799B2 (en) 2010-05-11
US6993292B2 (en) 2006-01-31
EP1479249A1 (en) 2004-11-24
CN100534231C (en) 2009-08-26
AU2002364094A1 (en) 2003-09-09
KR101025963B1 (en) 2011-03-30
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CA2477548C (en) 2011-02-08
JP4373220B2 (en) 2009-11-25

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