Simultaneous Ranging Frames for Low-Power Multi-Transmitter Reception
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Solution Overview
Problem
Devices with multiple transmitters, such as vehicles, require significant power consumption for reliable communication with remote devices like keyfobs, which have limited battery capacity, due to the need to listen for multiple transmissions.
Innovation Solution
Implementing a simulranging scheme where multiple transmitters send frames quasi-simultaneously with slight time offsets, allowing the receiver to decode only one frame while using pseudo-randomized pulses and secure training sequences to enhance security and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmitters send transmissions to improve reliability, then communication reliability is improved, but power consumption at the remote device increases
Solution Approach 1:
The patent implements periodic action by having multiple transmitters send transmissions at different time intervals rather than continuously. The remote device is configured to listen for transmissions during specific periodic time windows, allowing it to receive communications from multiple transmitters while consuming less power by remaining in sleep mode during other periods. This resolves the contradiction by maintaining communication reliability through multiple transmitters while reducing the remote device's power consumption through periodic listening rather than continuous reception.
2Reliability
If the remote device listens for multiple transmissions, then communication reliability is improved, but battery life is reduced
Solution Approach 1:
The remote device employs periodic action by activating its receiver only during predetermined time windows to listen for transmissions from multiple transmitters, then returning to sleep mode. This periodic listening schedule ensures the device can reliably receive communications from any of the multiple transmitters while significantly extending battery life by minimizing the time the power-consuming receiver is active.
Solution Approach 2:
The system uses preliminary action by pre-scheduling transmission time windows and pre-configuring the remote device's listening schedule before actual communications occur. This allows the remote device to know in advance when to wake up and listen, optimizing battery usage while ensuring it will be ready to receive transmissions from any transmitter that needs to communicate, thus maintaining reliability without continuously monitoring.
3Reliability
If multiple transmitters are used, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the communication system into multiple independent transmitters that operate semi-autonomously, each capable of sending transmissions independently. The remote device segments its reception process by listening during specific time windows for transmissions from different transmitters. This segmentation improves reliability through redundancy while managing complexity by keeping each transmitter and the receiver's processing logic relatively simple and modular.
Solution Approach 2:
The remote device implements universality by designing a single receiver that can handle transmissions from any of the multiple transmitters using the same protocol and processing logic. This multi-functional capability allows the device to communicate with multiple transmitters without requiring separate specialized receivers for each, thus improving transmission reliability through multiple options while avoiding the complexity increase that would result from having dedicated hardware for each transmitter.
Data Source
AI summary
Embodiments of a device for wireless communication are disclosed. In some embodiments, the device includes: a transceiver configured to receive a message from a second device and at least one processor. The processor is communicatively coupled to the transceiver and is configured to: generate a response message includes a SYNC portion, a start frame delimiter (SFD) portion, and a cipher portion. The SYNC portion includes a sequence of symbols forming a preamble. The cipher portion includes a ciphered sequence of pseudo-randomized pulses. The transceiver is further configured to transmit the response message.