Adaptive D2D Relay Switching for Sparse Emergency Messages
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Solution Overview
Problem
User equipment devices outside the coverage area of wireless base stations face challenges in relaying wireless data, particularly emergency messages, due to high power consumption and inefficient resource utilization when monitoring for infrequent D2D signals from multiple devices.
Innovation Solution
Implementing a relay device with a receiver that switches between ad hoc and organized operating modes based on switching criteria, balancing power consumption and communication load by activating the receiver periodically for sparse transmissions and continuously for dense transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay device continuously monitors for D2D signals in organized mode, then the reliability of receiving emergency messages is improved, but the power consumption increases significantly
Solution Approach 1:
The relay device dynamically switches between ad hoc mode (low power, periodic monitoring) and organized mode (high power, continuous monitoring) based on real-time conditions. The system transitions to organized mode when multiple transmitting devices are detected or emergency conditions are identified, and returns to ad hoc mode when traffic subsides, thus optimizing the balance between reliability and power consumption.
Solution Approach 2:
The system changes operational parameters (monitoring frequency, receiver activity level) based on traffic conditions. In ad hoc mode, the receiver operates with low power and periodic activity, while in organized mode, it switches to high power and continuous operation, allowing the system to adapt power consumption levels to actual communication needs.
2Productivity
If the relay device operates in organized mode to handle dense D2D traffic, then the communication load handling capability is improved, but the power consumption increases
Solution Approach 1:
The relay device dynamically adjusts its operational mode based on the volume and density of incoming D2D signals. When traffic density exceeds a threshold, the system transitions to organized mode to handle the increased load with dedicated resources. When traffic returns to normal levels, it switches back to ad hoc mode, thus optimizing power consumption relative to productivity needs.
Solution Approach 2:
The system employs periodic monitoring in ad hoc mode and continuous monitoring in organized mode, switching between these periodic action patterns based on traffic conditions. This allows the relay device to maintain high productivity capability when needed while minimizing power consumption during low-traffic periods.
3Use of energy by moving object
If the relay device uses periodic receiver activity to save power, then the power consumption is reduced, but the ability to receive sparse D2D signals may be compromised
Solution Approach 1:
The relay device implements periodic receiver activity in ad hoc mode, where the receiver is activated at predetermined intervals to monitor for D2D signals. This periodic action is sufficient for handling sparse traffic patterns while significantly reducing power consumption compared to continuous monitoring, as the receiver remains inactive between periodic intervals.
Solution Approach 2:
The system uses feedback from detected D2D signals to determine when to transition from ad hoc mode to organized mode. When the periodic monitoring detects multiple or emergency-type signals, it triggers a mode transition that activates continuous monitoring, ensuring reliable reception of sparse but critical signals without maintaining high power consumption during normal operation.
Data Source
AI summary
A communications network may include a relay device that receives device-to-device (D2D) signals. In an ad hoc mode, the relay may consume relatively little power while receiving relatively few messages from relatively few transmitting devices in the D2D signals. In an organized mode, the device may consume relatively high power while receiving many messages from many transmitting devices in the D2D signals. A receiver on the device may transition from the ad hoc mode to the organized mode in response to a first criterion and may transition from the organized mode to the ad hoc mode in response to a second switching criterion. This may allow the device to balance communications load and power consumption while relaying messages such as emergency messages received over D2D signals given that the signals may arrive rarely or in clusters due to an unforeseen event.