5G/NR Device-to-Device Relay Selection Over PC5 Links
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Solution Overview
Problem
The existing LTE sidelink relay solutions are not applicable to the 5G/NR system due to significant differences in frame structure, quality of service processing, and bearer configuration, necessitating new technical solutions for device-to-device (D2D) communication in 5G networks.
Innovation Solution
Methods and systems for discovery and selection/reselection of relay terminals in 5G/NR systems, involving the exchange of relay information, including layer 2 identifiers, and the use of PC5 links for establishing communication paths based on round trip delays, time stamps, random numbers, and layer 2 identifiers to optimize relay selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE sidelink relay solutions are applied, then relay communication can be established, but the solutions are not applicable to 5G/NR systems due to differences in frame structure, QoS processing, and bearer configuration
Solution Approach 1:
The patent segments the relay establishment process into distinct phases: discovery phase where UEs identify potential relay candidates, selection phase where optimal relay is chosen based on criteria like RSRP and QoS requirements, and configuration phase where PC5 links are established. This segmentation allows 5G/NR systems to implement relay functionality independently from LTE-specific implementations, resolving the adaptability issue while maintaining manageable complexity.
Solution Approach 2:
The patent creates a universal relay mechanism that can serve multiple 5G/NR functions including coverage extension, capacity enhancement, and diverse service support (eMBB, URLLC, mMTC). The PC5 interface design and relay selection criteria are formulated to be service-agnostic, allowing the same relay infrastructure to support different QoS requirements and frame structures without requiring LTE-specific adaptations.
2Productivity
If relay terminals are selected without optimization, then communication paths can be established, but data rates decrease and power consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where relay terminals report metrics such as RSRP, QoS parameters, and link quality to initiating UEs. The selection process continuously monitors these feedback signals and adjusts relay choices based on current network conditions. This feedback-driven optimization ensures that data rates are maximized by selecting relays with the best current performance, while avoiding unnecessary power consumption from switching to suboptimal relays.
Solution Approach 2:
The patent dynamically changes selection parameters based on service requirements and network conditions. For example, for URLLC services with strict latency requirements, the system prioritizes relays with lower round-trip delays, while for eMBB services, it may prioritize relays with higher data rates. This parameter adaptation allows the system to optimize the trade-off between data rate and power consumption according to specific service needs rather than using fixed selection criteria.
Data Source
AI summary
A wireless communication method for use in a third wireless terminal is disclosed. The method comprises: transmitting, to a fourth wireless terminal, a first PC5 link establishment request via a first relay terminal, wherein the first PC5 link establishment request comprises first relay selection information, receiving, from the fourth wireless terminal, a second PC5 link establishment request via a second relay terminal, wherein the second PC5 link establishment request comprises second relay selection information, selecting one of the first relay terminal or the second relay terminal based on the first relay selection information and the second relay selection information, and establishing a PC5 link with the fourth wireless terminal via the selected relay terminal.