Adaptive Protocol for Remote Keyless Entry Range
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Solution Overview
Problem
Current remote keyless entry (RKE) systems face limitations in range performance and latency, with hand-held devices having reduced antenna gain and limited transmission power, making it difficult to achieve reliable communication over long distances while maintaining low latency.
Innovation Solution
An adaptive protocol for signal transmission is implemented, where the format of signals changes based on whether a responsive signal is received, using high data rates for closer proximity and low data rates with packet division for longer ranges, allowing for increased transmission power and reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If hand-held remote devices are used with limited transmission power, then device portability is maintained, but operational range is reduced
Solution Approach 1:
The system dynamically adapts the communication protocol based on transmission conditions. The remote device switches between first protocol (higher data rate, lower power) and second protocol (lower data rate, higher power) depending on whether an acknowledgment is received, enabling extended operational range while maintaining power efficiency when possible
Solution Approach 2:
The system changes transmission parameters including data rate and protocol format based on communication success. When acknowledgments are not received, the system transitions to a protocol with lower data rate that allows for higher transmission power, thereby extending the operational range of the remote device
2Loss of time
If high data rate protocol is used for low latency, then response time is reduced, but transmission reliability over long distances deteriorates
Solution Approach 1:
The communication protocol is dynamically selected based on transmission outcomes. The system uses the first protocol (higher data rate, lower latency) when successful communication is achieved, and switches to the second protocol (lower data rate, higher reliability) when transmission failures occur, optimizing both latency and reliability adaptively
Solution Approach 2:
The system uses acknowledgment signals as feedback to determine protocol selection. When an acknowledgment is received, the system continues using the higher data rate protocol; when no acknowledgment is received, it switches to the more reliable lower data rate protocol, ensuring transmission reliability while minimizing latency
3Length of moving object
If transmission power is increased to extend range, then operational distance is improved, but latency becomes more perceptible
Solution Approach 1:
The system dynamically adjusts protocol selection based on communication success rather than continuously using high power mode. This allows the system to achieve extended range when needed while maintaining low latency performance during successful transmissions, making latency imperceptible in normal operation
Data Source
AI summary
In one embodiment of a system and method for remote activation of a device includes, a transceiver is provided for transmitting a command signal according to a first transmission protocol having a first data rate, receiving an acknowledgment signal indicating that the command signal transmitted according to the first transmission protocol has been received, and transmitting the command signal according a second transmission protocol, the second transmission protocol having a second data rate less than the first data rate and including partition of the command signal. A controller is provided for selecting the first transmission protocol for use in transmitting the command signal in response to a user input, and selecting the second transmission protocol for use in transmitting the command signal when the transceiver fails to receive the acknowledgment signal.