RFID transponder

• US 9,436,899 B2
• Filed: 04/04/2006
• Issued: 09/06/2016
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: NXP B.V. (NXP Semiconductors NV)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Haar, Helmut, Bischof, Kurt, Scharke, Heiko
• Primary Examiner(s): ALAM, MIRZA F
• Application Number:
  US11/911,489
• Publication Number:
  US 20080204194A1
• Time in Patent Office: 3,808 Days
• Field of Search: 340/10.1, 340/10.3, 340/572.1, 340/505, 340/573.1, 340/539.11, 340/539.1, 340/572.4, 340/10.33, 340/10.34, 340/10.42, 340/10.2, 340/10.52, 340/539, 340/573.4, 340/531, 235/375, 235/384, 235/385, 705/5, 707/3
• US Class Current: 1/1
• CPC Class Codes: 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
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10039 interrogator driven, i.e. synchronous
• CPC Class Codes: H04B 7/0802 using antenna selection H04B7/0868 takes precedence; antenna beam directivity switching H01Q3/24
• CPC Class Codes: H04L 43/0864 Round trip delays

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

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.

2. 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.

3. 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.

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

5. 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.

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