Pedestrian V2X Safety Message Scheduling for Low-Power UEs
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Solution Overview
Problem
Wireless communication systems, particularly in vehicular applications, face challenges with power and resource constraints in pedestrian user equipment (PUEs) due to frequent safety message communications, which strain battery-powered devices and lead to high power consumption and resource usage.
Innovation Solution
The proposed solution involves scheduling safety message communications in V2X networks to conserve resources in power-limited devices by adjusting the frequency and timing of transmissions based on factors like mobility, position, and power capabilities, using techniques such as wake-up window scheduling, reducing message size through compression, and incorporating safety messages into existing random-access channel procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety message communications are performed with high frequency to effectively coordinate traffic activity, then traffic coordination effectiveness is improved, but power consumption of pedestrian UEs increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where pedestrian UEs alternate between sleep mode and active monitoring periods. During DRX cycles, UEs only wake up at predetermined intervals to check for safety messages, rather than continuously monitoring. This periodic action maintains traffic coordination effectiveness while dramatically reducing power consumption by keeping the receiver off during non-critical periods.
Solution Approach 2:
The patent applies different communication strategies to different types of UEs based on their power capabilities. Pedestrian UEs with limited power resources receive reduced-frequency safety messages compared to vehicle UEs, which have more robust power supplies. This local differentiation allows the system to maintain overall reliability while protecting the power-constrained pedestrian devices.
2Loss of time
If safety messages are transmitted frequently to ensure real-time traffic information, then information freshness is improved, but resource usage of battery-powered devices increases
Solution Approach 1:
The patent dynamically adjusts the transmission frequency of safety messages based on current traffic conditions and UE power states. During high-risk periods with increased pedestrian activity or complex traffic scenarios, message frequency increases to maintain information freshness. During low-risk periods, frequency decreases to conserve battery resources. This dynamic adaptation allows the system to optimize the trade-off between information freshness and energy consumption in real-time.
Solution Approach 2:
The patent enables pedestrian UEs to autonomously manage their power resources by implementing adaptive DRX cycles. Each UE monitors its own battery status and traffic conditions, then self-adjusts its reception schedule accordingly. This self-service approach allows UEs to maintain adequate situational awareness while independently managing their power consumption without requiring constant network control.
3Reliability
If pedestrian UEs continuously monitor for incoming safety messages, then collision detection capability is improved, but device power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where pedestrian UEs alternate between sleep mode and active monitoring periods. During DRX cycles, UEs only wake up at predetermined intervals to check for safety messages, rather than continuously monitoring. This periodic action maintains traffic coordination effectiveness while dramatically reducing power consumption by keeping the receiver off during non-critical periods.
4Use of energy by moving object
If the frequency of safety message communications is reduced to conserve UE resources, then power consumption decreases, but traffic coordination effectiveness may be compromised
Solution Approach 1:
The patent incorporates feedback mechanisms where UEs report their power status, mobility state, and traffic environment to the network. The base station uses this feedback to dynamically adjust message scheduling for each UE. For example, if a pedestrian UE reports low battery and slow movement, the network reduces message frequency to that UE. If the same UE reports high mobility or enters a complex traffic zone, the network increases frequency. This feedback-driven approach ensures traffic coordination effectiveness is maintained when needed while conserving power during low-risk periods.
Data Source
AI summary
Embodiments are presented herein for adjusting the conduct of routine communications of safety messages in V2X networks in order to conserve resources in participating power-limited devices while satisfying V2X system latency demands. Scheduling (e.g., timing and/or frequency) of safety message communications performed by certain UE devices participating in a V2X network may be dynamically adjusted according to various criteria, such as factors relating to the DRX cycle schedule, motion or mobility, traffic environment, and/or battery or power capabilities of the UE devices, which may conserve UE resources and power consumption. Certain UE devices may efficiently transmit safety messages to the V2X network using one of several proposed RACH-based procedures. In some embodiments, the size of safety message communications may be reduced through various compression techniques, and/or by reducing the amount of contained information, e.g., by omitting certain parameters, which may reduce the resources consumed by performing safety message communications.