# US 9,517,664 B2 · RF transmission method and apparatus in a tire pressure monitoring system

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- Number: US 9,517,664 B2
- Document ID: US9517664B2
- Status: Granted
- Kind: B2
- Application number: 14/627,440
- Filed: 2015-02-20
- Published: 2016-08-25
- Granted: 2016-12-13
- Earliest claimed: 2015-02-20
- Assignees: Continental Automotive Systems, Inc.
- Applicants: Continental Automotive Systems, Inc.
- Inventors: Matthew D McIntyre; Jean-Christophe Deniau; Brian Farrell; Yasser Gad
- Web page: https://patentgrep.com/patent/US9517664B2

## CPC

- H04L 43/18: Protocol analysers
- B60C 23/02: Signalling devices actuated by tyre pressure {(hand-held tyre pressure gauges G01L17/00)}
- B60C 23/0455: {Transmission control of wireless signals}
- B60C 23/0462: {Structure of transmission protocol}
- H04L 43/08: Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L 67/12: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
- H04W 52/225: {Calculation of statistics, e.g. average or variance}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

In some aspects, a plurality of frames to be transmitted is assembled. The averaging factor is determined for each frame. Each frame is transmitted with the averaging power determined for each frame and not with the worst case averaging power from the plurality of frames.

## Claims

### Claim 1

A method of increasing transmission performance between a tire pressure monitoring sensor and a receiver in a vehicle, the method comprising:
receiving a plurality of frames to be transmitted, each of the plurality of frames being separated by a first inter frame timing distance;
determining an averaging factor for each of the plurality of frames, and a worst case averaging factor;
determining a second inter frame timing distance that separates each of the plurality of frames, the second inter frame timing distance being less than the first inter frame timing distance;
assembling the frames into a transmission burst and separating these frames with the second inter frame timing distance;
inserting an additional frame into the transmission burst;
transmitting each of the frames of the transmission burst with the worst case averaging factor.

### Claim 2 (depends on 1)

The method of claim 1, wherein each frame is transmitted to a receiver in the vehicle.

### Claim 3 (depends on 2)

The method of claim 2, wherein the receiver makes a decision as to whether the pressure is below a predetermined threshold.

### Claim 4 (depends on 1)

The method of claim 1, wherein each of the frames has a protocol of a different automobile manufacturer.

### Claim 5 (depends on 1)

The method of claim 1, wherein the frames are transmitted at approximately 315 Mhz or at approximately 433.92 Mhz.

### Claim 6 (depends on 1)

The method of claim 1, wherein the additional frame is duplicative of one of the first frames.

### Claim 7 (depends on 1)

The method of claim 1, wherein the additional frame includes additional information from the first frames.

### Claim 8

A method of increasing transmission performance between a tire pressure monitoring sensor and a receiver in a vehicle, the method comprising:
receiving a plurality of frames to be transmitted each of the frames being separated by a first inter frame timing distance;
determining an averaging factor for each frame, a worst case averaging factor, and a frame associated with the worst case averaging factor;
assembling the frames to be transmitted into a transmission burst;
inserting additional bits into the preamble of selected frames in the transmission burst;
transmitting the transmission burst with averaging power determined for worst case averaging power from the plurality of frames.

### Claim 9 (depends on 8)

The method of claim 8, wherein the selected frames do not have the worst case averaging factor.

### Claim 10

An apparatus configured to increase transmission performance between a tire pressure monitoring sensor and a receiver in a vehicle, the method comprising:
an interface with an input and an output, the input configured to receive a plurality of frames, each of the frames being separated by a first inter frame timing distance;
a controller coupled to the interface, the controller configured to determine the averaging factor for each of the plurality of frames and a worst case averaging factor, the controller configured to determine a second inter frame timing distance that separates each of the plurality of frames, the second inter frame timing distance being less than the first inter frame timing distance, the controller configured to assemble the frames into a transmission burst and separate these frames with the second inter frame timing distance, the controller configured to insert an additional frame into the transmission burst and transmit the transmission burst at the output of the interface, each frame of the transmission burst being transmitted with the worst case averaging factor of the plurality of frames.

### Claim 11 (depends on 10)

The apparatus of claim 10, wherein the controller is configured to transmit each frame to a receiver in the vehicle.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the receiver makes a decision as to whether the pressure is below a predetermined threshold.

### Claim 13 (depends on 10)

The apparatus of claim 10, wherein each of the frames has a protocol of a different automobile manufacturer.

### Claim 14 (depends on 10)

The apparatus of claim 10, wherein the frames are transmitted at approximately 315 Mhz or at approximately 433.92 Mhz.

### Claim 15 (depends on 10)

The apparatus of claim 10, wherein the additional frame is duplicative of one of the first frames.

### Claim 16 (depends on 10)

The apparatus of claim 10, wherein the additional frame includes additional information from the first frames.

### Claim 17

An apparatus configured to increase transmission performance between a tire pressure monitoring sensor and a receiver in a vehicle, the apparatus comprising:
an interface with an input and an output, the input configured to receive a plurality of frames to be transmitted, each of the first frames being separated by a first inter frame timing distance;
a controller coupled to the interface, the controller configured to determine an averaging factor for each frame, a worst case averaging factor for the plurality of frames, and the frame associated with the worst case averaging factor, the controller configured to assemble the first frames to be transmitted into a transmission burst, the controller configured to insert additional bits into the preamble of selected frames in the transmission burst and to transmit the transmission burst at the output with worst case averaging power.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the selected frames do not have the worst case averaging factor.