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. <IMAGE> |
申请公布号 |
EP0973117(A3) |
申请公布日期 |
2002.08.28 |
申请号 |
EP19990301793 |
申请日期 |
1999.03.09 |
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 |
主分类号 |
H04B7/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|