发明名称 |
METHOD AND SYSTEM FOR TRANSMITTING SHORT MESSAGES TO A PORTABLE IR TRANSCEIVER |
摘要 |
In a method and system (10) for effecting bi-directional IR data communication between an object transceiver (26) and a reader (21, 22, 23, 24), the object transceiver transmits successive data packets to the reader, and upon termination of a transmission of each data packet, opens a time window for receiving a transmission from the reader. The object transceiver is typically one of a plurality of object transceivers each worn by a person to whom a short message is to be transmitted and each having a respective unique ID and being able to effect autonomous transmission to the reader. In such case, each object transceiver transmits for a negligible fraction of its duty cycle thereby reducing a likelihood that two or more object transceivers will try to transmit simultaneously. Alternatively, the same objective can be realized by controlling each object transceiver to have a randomly variable duty cycle.
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申请公布号 |
WO0133749(A1) |
申请公布日期 |
2001.05.10 |
申请号 |
WO2000IL00718 |
申请日期 |
2000.11.05 |
申请人 |
ELPAS ELECTRO-OPTIC SYSTEMS LTD.;RADOMSKY, ISRAEL;ABRAMS, ISRAEL;BRUSLAVSKY, YOSSEF |
发明人 |
RADOMSKY, ISRAEL;ABRAMS, ISRAEL;BRUSLAVSKY, YOSSEF |
分类号 |
H04B10/114;H04B10/40;H04L12/28;(IPC1-7):H04B10/10 |
主分类号 |
H04B10/114 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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