# US 9,436,899 B2 · RFID transponder

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- Number: US 9,436,899 B2
- Document ID: US9436899B2
- Status: Granted
- Kind: B2
- Application number: 11/911,489
- Filed: 2006-04-04
- Published: 2008-08-28
- Granted: 2016-09-06
- Earliest claimed: 2005-04-15
- Assignees: NXP B.V.
- Applicants: Helmut Haar; Kurt Bischof; Heiko Scharke
- Inventors: Helmut Haar; Kurt Bischof; Heiko Scharke
- Web page: https://patentgrep.com/patent/US9436899B2

## CPC

- G06K 19/0723: {the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs}
- G06K 7/0008: {General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer}
- H04B 7/0802: {using antenna selection (H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24)}
- H04L 43/0864: Round trip delays
- G06K 7/10039: {interrogator driven, i.e. synchronous}
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An integrated circuit (1a) for a transponder (1), wherein said integrated circuit (1a) is switchable between a TTF (transponder talks first) and an RTF (reader talks first)-mode within a switching timeframe (TF2), wherein the position of the switching timeframe (TF2) is shif table in relation to a timeframe (TF1) allocated to the TTF-mode. In a preferred embodiment, the switching timeframe (TF2) is before a timeframe (TF1) allocated to the TTF-mode by default. After initialization of the transponder (1), the switching timeframe (TF2) is switched to a position after the timeframe.

## Claims

### Claim 1

A method of initializing a transponder, the transponder being switchable between a TTF mode and an RTF mode within a switching timeframe, the method comprising:
shifting a position of the switching timeframe from a first position to a second position relative to a timeframe allocated to the TTF mode, wherein the second position is different from the first position and at least one predefined condition results in shifting of the switching timeframe.

### Claim 2 (depends on 1)

The method as claimed in claim 1, further comprising:
shifting the position of the switching timeframe from a position after the timeframe allocated to the TTF mode to a position before the timeframe allocated to the TTF mode.

### Claim 3 (depends on 1)

The method as claimed in claim 1, further comprising:
shifting the position of the switching timeframe from a position before the timeframe allocated to the TTF mode to a position after the timeframe allocated to the TTF mode.

### Claim 4 (depends on 1)

The method as claimed in claim 1, wherein a default position of the switching timeframe is before the timeframe allocated to the TTF mode.

### Claim 5 (depends on 1)

The method of claim 1, wherein the at least one predefined condition comprises exceeding a number of entries within a communication range of a transponder.

### Claim 6 (depends on 1)

The method of claim 1, wherein the at least one predefined condition comprises a first writing operation.