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US 7,609,147 B2Granted
Method and apparatus for improving wireless data transmission
AssigneeAtmel Automotive GmbH
InventorUlrich Friedrich
Life of this patent
Estimating the term…
Abstract
A method and apparatus includes at least one transponder or sensor to transmit useful data in an asynchronous mode to at least one reader. Before the start of the useful data transmission, the reader transmits a return link header to the transponder or sensor, which contains at least one bit length reference symbol as a reference time to define the bit length in the return link.
Claims15
A method for transmitting, the method comprising the steps of:
- transmitting from a reader to at least one transponder or sensor a return link header to the transponder or sensor, the return link header including at least one bit length reference symbol as a reference time to define a bit length in a return link;
- and
- transmitting useful data by the at least one transponder or sensor in an asynchronous mode,
- wherein the return link header is transmitted to the at least one transponder or sensor prior to the transmission of useful data by the at least one transponder or sensor;
- wherein at least the reference time is stored in the transponder or sensor, and for subsequent transmissions, no return link header is transmitted and the stored reference time is used to set the baud rate.
2 more elements
An apparatus for wireless data transmission, the apparatus comprising:
- at least one reader for transmitting a header having transmission parameters;
- and
- at least one transponder or remote sensor being located in an electromagnetic field generated by the reader, the transponder or remote sensor receiving the transmitted header from the reader, the transponder including a comparator and controller for comparing a time with a reference time, which is contained in the header,
- the header is a return link header including at least one bit length reference symbol as the reference time to define a bit length in a return link;
- and
- wherein at least the reference time is stored in the transponder or remote sensor, and for subsequent transmissions, no return link header is transmitted and the stored reference time is used to set the baud rate,
- wherein the transponder controls a transmission baud rate from the transponder or sensor to the reader on the basis of a comparison result of the time with the reference time.
4 more elements
Dependencies are inferred from the claim text.