Sidelink Power Saving for IoT Relaying
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing NR-SL interface is not optimal for supporting battery-operated, low data rate IoT devices due to differences in traffic characteristics compared to massive IoT use cases, necessitating power-saving solutions for UE-based relaying.
Innovation Solution
Adapting the NR-SL interface to incorporate power-saving modes such as Power Saving Mode (PSM) and Discontinuous Reception (DRX) for IoT devices, allowing them to monitor for transmissions only during designated time periods and reducing power consumption by maintaining state information and UE context during inactive periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IoT devices continuously monitor for transmissions to ensure reliable communication, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic monitoring where IoT devices wake up at predetermined intervals to monitor for transmissions and then return to sleep mode. This periodic action maintains communication reliability by ensuring devices check for messages at regular intervals while dramatically reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent uses preliminary action by establishing predetermined wake-up times and monitoring schedules before the actual communication occurs. Devices are configured in advance with timing information so they know when to wake up and monitor, eliminating the need for continuous monitoring while ensuring they are available when transmissions occur.
2Use of energy by moving object
If IoT devices enter sleep mode to conserve power, then power consumption is reduced, but communication latency increases
Solution Approach 1:
The patent implements periodic monitoring where IoT devices wake up at predetermined intervals to monitor for transmissions and then return to sleep mode. This periodic action maintains communication reliability by ensuring devices check for messages at regular intervals while dramatically reducing power consumption compared to continuous monitoring.
Solution Approach 2:
The patent incorporates feedback mechanisms where receiving devices send wake-up notifications or status information to transmitting devices. This feedback allows the network to coordinate transmissions with device wake-up schedules, reducing latency by ensuring transmitting devices know when receiving devices will be available without requiring continuous monitoring.
3Reliability
If NR-SL interface uses continuous monitoring for V2X applications, then communication reliability is maintained, but it is not optimal for battery-operated IoT devices
Solution Approach 1:
The patent applies dynamics by making the monitoring behavior adaptable rather than static. IoT devices can dynamically switch between continuous monitoring and periodic monitoring modes based on their power availability, traffic requirements, and communication priorities. This dynamic adaptation allows the same NR-SL interface to serve both high-power V2X applications and battery-operated IoT devices effectively.
Solution Approach 2:
The patent changes key operational parameters such as monitoring interval duration, wake-up frequency, and transmission timing based on device type and power constraints. By adjusting these parameters, the system optimizes performance for different scenarios - using shorter intervals for high-reliability V2X communication and longer intervals for power-constrained IoT devices, thereby achieving both reliability and energy efficiency.
Data Source
AI summary
A first wireless communication device (401, 404), WCD, transmits a first indication to a second WCD (401, 404) or receives a first indication from the second WCD. The first indication indicates a first time period (501) during which the first WCD is expected to monitor for receipt of a transmission. The first WCD monitors for receipt of a transmission during the first time period. The first WCD is not expected to monitor for receipt of a transmission during a second time period (502) before the first time period begins. The first WCD performs the transmission or receipt of the first indication after a link has been established between the first WCD and the second WCD for relaying of information to and/or from a network via one or more sidelink transmissions between the first WCD and the second WCD.