Pedestrian V2X Safety Messaging With DRX-Based Power Saving
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Solution Overview
Problem
Wireless communication systems, particularly in vehicular applications, face challenges in conserving power and resources for pedestrian UE devices due to the high frequency of safety message communications required in V2X systems, which strain their limited power capabilities and resource constraints.
Innovation Solution
The V2X network adjusts safety message communications by scheduling them during UE wake-up windows, reducing transmission frequency based on mobility, power capabilities, and environmental factors, and utilizing modified RACH procedures to efficiently transmit safety messages, thereby conserving power and resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety message communications are performed with high frequency to coordinate traffic activity, then V2X system coordination effectiveness is improved, but power consumption of pedestrian UE devices increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where pedestrian UEs alternate between sleep mode and active monitoring periods. Safety messages are scheduled to be transmitted only during wake-up windows within DRX cycles, converting continuous high-frequency communications into periodic transmissions. This maintains traffic coordination effectiveness while dramatically reducing power consumption by keeping the UE in low-power state during non-critical periods.
Solution Approach 2:
The patent dynamically adjusts the periodicity and timing of safety message transmissions based on real-time traffic conditions, UE mobility state, and channel quality. The base station schedules messages adaptively, increasing frequency during high-risk scenarios (e.g., pedestrian crossing roads) and reducing frequency during low-activity periods. This dynamic scheduling optimizes the balance between coordination reliability and power consumption.
2Loss of time
If safety message transmission frequency is increased to reduce latency, then V2X system response time is improved, but resource consumption of pedestrian UE devices increases
Solution Approach 1:
The patent implements advance scheduling where the base station pre-allocates uplink resources and provides scheduling information to pedestrian UEs before their wake-up windows. UEs prepare safety messages in advance during active periods, and the base station buffers and forwards them during scheduled transmission windows. This preliminary preparation reduces latency by eliminating message assembly delays while conserving resources by limiting active processing to predefined time intervals.
Solution Approach 2:
The base station acts as an intermediary that buffers and forwards safety messages from pedestrian UEs. UEs transmit messages to the base station during wake-up windows, and the base station handles retransmissions and forwarding to other network entities. This intermediary approach reduces UE resource consumption by offloading complex communication protocols and retransmission handling to the base station while maintaining low latency through efficient buffering and scheduled forwarding.
3Measurement precision
If pedestrian UEs frequently monitor for incoming safety messages, then traffic awareness accuracy 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. Safety messages are scheduled to be transmitted only during wake-up windows within DRX cycles, converting continuous high-frequency communications into periodic transmissions. This maintains traffic coordination effectiveness while dramatically reducing power consumption by keeping the UE in low-power state during non-critical periods.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors UE battery status, mobility state, and message reception quality. Based on this feedback, the base station dynamically adjusts DRX cycle lengths, wake-up window timing, and message transmission frequency. This feedback-driven adaptation optimizes the balance between traffic awareness accuracy and power consumption, ensuring UEs with low battery or low mobility use longer DRX cycles while active UEs receive more frequent updates.
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.