Two-Stage Relay Discovery for Power-Efficient Sidelink
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Solution Overview
Problem
Current wireless communication systems face challenges in power-efficient relay discovery procedures for sidelink communications, particularly for low-power devices that struggle with high energy consumption in single-message based discovery methods.
Innovation Solution
A two-stage discovery procedure is implemented, where user equipment (UE) first detects a relay beacon and then, if it meets a threshold, proceeds to establish a sidelink connection by monitoring for a relay announcement or transmitting a discovery request, optimizing power usage through passive and active discovery modes based on proximity and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-message based discovery methods are used, then relay discovery can be performed, but power consumption increases significantly
Solution Approach 1:
The discovery procedure is divided into two distinct stages: a first stage for detecting relay beacons and a second stage for establishing connections. This segmentation allows the UE to perform preliminary relay detection with lower power consumption before committing to more power-intensive connection establishment procedures.
Solution Approach 2:
The patent implements preliminary relay detection through beacon monitoring in the first stage before proceeding to the second stage for connection establishment. This preliminary action filters out unsuitable relays early, preventing power-intensive operations on unsuitable targets.
2Reliability
If UE continuously monitors for relay announcements, then connection establishment is reliable, but energy consumption increases
Solution Approach 1:
The patent implements dynamic monitoring behavior where the UE adjusts its monitoring activity based on conditions. The UE monitors for relay beacons continuously but only proceeds to monitor for relay announcements when the beacon detection satisfies selection criteria, creating a conditional dynamic monitoring approach.
Solution Approach 2:
The UE uses feedback from beacon power measurements to determine whether to proceed to the second stage. The measured power of the relay beacon serves as feedback that triggers or prevents further monitoring activities, optimizing energy usage based on actual relay suitability.
3Reliability
If UE performs detailed relay analysis, then connection quality improves, but processing time and power usage increase
Solution Approach 1:
The analysis process is segmented into preliminary beacon detection (first stage) and detailed connection analysis (second stage). This allows basic relay identification to be performed quickly with minimal processing, while detailed analysis is deferred to when necessary.
Solution Approach 2:
The patent applies partial action by performing only the necessary level of analysis at each stage. The first stage performs basic beacon detection without exhaustive analysis, while the second stage performs detailed analysis only when the first stage indicates potential suitability, avoiding excessive processing time.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may implement a power-efficient discovery procedure to establish a relay. In some cases, the UE may monitor a resource pool for a relay beacon from a relay device and measure a received power of the relay beacon. If the received power satisfies a threshold, the UE may monitor for a relay announcement from the relay device and establish a sidelink connection with the relay device based on the relay announcement. The relay beacon may support a two-stage discovery procedure, where the UE determines a relay device is available before processing a relay announcement to conserve power. Additional techniques for proximity-based discovery are described herein.