Relay UE Selection Using Load and Battery Status
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Solution Overview
Problem
In 5G NR cellular networks, remote UEs face challenges in selecting and reselecting relay UEs for data transmission due to reliance on purely radio signal quality criteria, which may not ensure optimal service quality or network coverage, especially when link quality with the base station is poor or unavailable.
Innovation Solution
A method for relay UE selection and reselection that considers additional criteria beyond radio signal quality, including relay load and assistance information such as link quality, battery status, and resource availability, to optimize data transmission and network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE selection is based on purely radio signal quality criteria, then the selection process is simple and fast, but the service quality and network coverage are not optimized
Solution Approach 1:
The patent changes the selection parameters from purely radio signal quality (RSRP) to a comprehensive set of parameters including relay load, link quality, battery status, and resource availability. This parameter expansion allows the system to optimize service quality by considering multiple factors simultaneously, resolving the contradiction between simple selection and optimized service quality.
Solution Approach 2:
The patent adds new dimensions to the relay UE selection process by introducing non-signal parameters such as relay load, battery status, and resource availability alongside traditional signal quality metrics. This dimensional expansion enables the system to make more informed selection decisions that balance multiple objectives, thereby improving service quality without excessive complexity.
2Reliability
If relay UE selection considers multiple criteria including relay load and resource availability, then service quality and network coverage are optimized, but the selection process becomes more complex
Solution Approach 1:
The patent implements preliminary actions by having relay UEs broadcast their status information (load, battery status, resource availability) in advance before actual data transmission begins. This pre-sharing of information allows remote UEs to make informed selection decisions without needing to perform complex real-time measurements, thus reducing selection time while maintaining comprehensive evaluation criteria.
Solution Approach 2:
The patent establishes a feedback mechanism where relay UEs continuously report their status information to potential remote UEs. This feedback loop enables dynamic selection based on real-time conditions while the feedback itself is structured to be efficient, balancing comprehensive information gathering with time constraints through prioritized information exchange.
3Adaptability or versatility
If relay UE selection uses comprehensive criteria beyond signal quality, then network coverage and service quality improve, but the complexity of relay discovery and selection procedures increases
Solution Approach 1:
The patent makes the relay discovery and selection procedure universal by designing a unified framework that handles multiple selection criteria (signal quality, relay load, link quality, battery status, resource availability) through a single consistent process. This multi-functional approach allows the same procedure to adapt to different scenarios and priorities without requiring separate complex algorithms for each criterion, thereby improving adaptability while managing complexity.
Data Source
AI summary
Mechanism of relay UE discovery and relay UE selection and reselection for remote UE data transmission with a serving base station via relay UE is proposed. A method operable for relay UE selection and reselection of remote UE is provided. The UE considers additional criteria such as relay load other than purely radio signal quality (e.g., RSRP) criteria. The relay load can serve different purpose for relay UE and remote UE. The relay load can be the criteria for UE to become a relay UE or not. It can be the criteria for a remote UE to select another UE as its relay UE.