Wake-Up Receiver With Bluetooth Low Energy For IoT
Solution Overview
Problem
Existing communication protocols, such as Bluetooth Low Energy (BLE), face challenges in efficiently managing energy consumption and spectrum usage in IoT devices, particularly due to the high frequency of polling packets when data is infrequently transmitted.
Innovation Solution
The proposed method involves using wake-up receivers (WURs) in wireless mesh networks to efficiently establish connections between nodes by transmitting wake-up signals with a wider bandwidth than the channel selective filter of the receiving node, allowing for relaxed frequency generation and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polling packets are sent frequently to ensure data transmission reliability, then the reliability of data reception is improved, but the energy consumption and spectrum usage increase significantly
Solution Approach 1:
The system performs preliminary actions by sending polling packets only when there is actual data to transmit, rather than continuously polling. The transmitter checks for available data before initiating polling, and the receiver prepares to receive by monitoring for wake-up signals. This preliminary check prevents unnecessary polling when no data is available, resolving the contradiction between reliability and energy consumption.
Solution Approach 2:
The system implements self-service through event-driven communication where the transmitter autonomously determines when polling is necessary based on data availability. The receiver autonomously monitors for wake-up signals and initiates connection establishment only when needed. This self-service mechanism eliminates continuous polling while maintaining reliability, reducing energy consumption significantly.
2Reliability
If polling packets are sent frequently to ensure data transmission, then the data transmission reliability is improved, but the spectrum efficiency deteriorates
Solution Approach 1:
The system performs preliminary checks to determine data availability before sending polling packets. The transmitter checks if data is ready in the data buffer, and only initiates polling when data is present. This preliminary action prevents spectrum waste from unnecessary polling transmissions while ensuring reliable data transmission when actually needed.
Solution Approach 2:
The communication system uses event-driven self-service where the transmitter automatically initiates polling only when data becomes available, and the receiver automatically establishes connections when wake-up signals are detected. This self-service approach ensures spectrum efficiency by eliminating redundant polling transmissions while maintaining transmission reliability through automated data-driven communication.
3Loss of time
If the receiver continuously listens for transmissions, then the response time is reduced, but the energy consumption increases
Solution Approach 1:
The system implements periodic action through event-driven polling where the transmitter periodically checks for data availability and initiates polling only when needed, rather than continuous listening. The receiver periodically monitors for wake-up signals at low power states. This periodic, event-triggered approach maintains fast response times while dramatically reducing energy consumption compared to continuous listening.
Solution Approach 2:
The system uses self-service mechanisms where the transmitter autonomously determines when to poll based on data availability, and the receiver autonomously responds to wake-up signals. This eliminates the need for continuous listening while maintaining rapid response times through automated event-driven communication, resolving the contradiction between response time and energy consumption.
4Use of energy by moving object
If wake-up signals are transmitted with wider bandwidth, then the frequency generation requirements are relaxed and power consumption is reduced, but the spectrum usage increases
Solution Approach 1:
The system applies partial action by transmitting wake-up signals with wider bandwidth than strictly necessary for minimal communication. This excessive bandwidth usage in the wake-up signal phase relaxes frequency generation requirements and reduces power consumption, accepting temporary spectrum inefficiency to achieve lower operational power consumption during the majority of the communication cycle when polling is minimized.
Data Source
AI summary
A method of establishing connection between a first node in a wireless network and a second node in said wireless network, wherein each of said first and second nodes comprise a primary radio receiver and a wake up receiver, each of said nodes comprising a Radio Frequency, RF, switch, arranged to connect one of said primary or secondary radios to a radio antenna, said method comprising the steps of transmitting, by said first node, to a wake-up receiver of a second radio node, a wake-up signal that indicates a frequency channel on which the second radio node is to transmit a response, receiving, by said first node, in response to transmitting said wake-up signal, response from said second radio node on the frequency channel indicated, and establishing, by said first node, a connection between said first and second nodes in order to transfer data between said first and second nodes. The present disclosure also relates to corresponding mesh nodes and a computer program product.