Wireless Device Wake-Up Receiver for Coverage-Aware Data Transmission
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Solution Overview
Problem
Existing wireless communication technologies for battery-less IoT devices result in energy waste and unnecessary interference due to uplink transmissions when out of coverage, as they lack efficient mechanisms to verify coverage before transmitting.
Innovation Solution
A wireless device uses a low-power wake-up receiver to monitor a coverage wake-up signal, waking up a main receiver only when in coverage to transmit data, thereby avoiding unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device continuously monitors for coverage and attempts uplink transmissions, then the device ensures data transmission reliability, but energy consumption increases and unnecessary interference occurs when out of coverage
Solution Approach 1:
The wireless device performs preliminary coverage detection by monitoring for the coverage wake-up signal before attempting any uplink transmission. This preliminary action determines whether the device is in coverage area, and only if yes, the device proceeds to wake up the main receiver and attempt transmission. This prevents wasteful transmissions when out of coverage while ensuring reliable transmissions when in coverage.
2Use of energy by moving object
If the wireless device uses a low-power wake-up receiver to monitor coverage, then energy consumption is reduced, but the device cannot detect all transmission opportunities
Solution Approach 1:
The reception function is segmented into two distinct receivers with different capabilities and power consumption characteristics. The wake-up receiver handles only coverage detection with minimal power consumption, while the main receiver handles full transmission opportunities with higher power consumption. This segmentation allows the system to optimize between energy saving and transmission opportunity detection by activating only the necessary receiver for each task.
Solution Approach 2:
The wake-up receiver acts as an intermediary component that screens for coverage availability before the main receiver is activated. It serves as a filter that prevents the main receiver from being woken up unnecessarily when the device is out of coverage, thereby reducing overall energy consumption while maintaining the ability to detect all transmission opportunities when in coverage.
3Productivity
If the device wakes up the main receiver frequently to check coverage, then transmission opportunities are not missed, but energy waste increases due to unnecessary wake-ups
Solution Approach 1:
The system performs the preliminary action of coverage detection using the low-power wake-up receiver before activating the main receiver. This ensures that the main receiver is only woken up when the device is actually in coverage and transmission opportunities exist, preventing energy waste from unnecessary wake-ups while capturing all transmission opportunities when in coverage.
Data Source
AI summary
A method performed by a wireless device (131). The wireless device (111) operates in a wireless communications network (100). The device monitors (504), in sleep mode, using a first receiver, which is a WUR, whether a first radio signal is received. The signal indicates the device is in coverage of a node (101). The monitoring (504) is performed with the proviso the device has obtained information to send. The device also sends (508) the information based on whether it receives the signal. If the device receives the signal, the signal wakes-up a second receiver, sends the information using the second receiver, goes back to sleep, and c) refrains from monitoring (504) with the proviso the device lacks further information to be sent. If the device fails to receive the signal, it stores the information and b) stays in sleep mode, until it sends the information, using the second receiver, when the wireless device (131) receives the signal.