发明名称 |
System for short range wireless data communication to inexpensive endpoints |
摘要 |
A system provides short range wireless data communication from a central control point (e.g., interrogator) to inexpensive endpoints (e.g., tags). The endpoints utilize the technology of modulated backscatter for transmission from the tags to the interrogator. The system uses a new downlink protocol for data transmission from the interrogator to the tags and a new uplink protocol for data transmission from the tags to the interrogator. Both protocols use a backoff/retry algorithm to randomly retransmit any non-acknowledged messages. System capacity from the tags to the interrogator is further enhanced by the use of uplink subcarrier frequency division multiplexing.
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申请公布号 |
US6177861(B1) |
申请公布日期 |
2001.01.23 |
申请号 |
US19980118647 |
申请日期 |
1998.07.17 |
申请人 |
LUCENT TECHNOLOGIES, INC |
发明人 |
MACLELLAN JOHN AUSTIN;SHOBER R. ANTHONY |
分类号 |
H04B7/26;G06K7/00;H04B1/59;H04B5/02;H04J1/00;H04L5/16;(IPC1-7):H04Q5/22 |
主分类号 |
H04B7/26 |
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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