D2D Relay UE Sidelink Quality Reporting for High Data Rate
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Solution Overview
Problem
Current LTE Rel.13 sidelink functionality for network-to-UE relaying suffers from poor performance due to high latency, limited data rates, and lack of channel quality reporting and adaptation at the L1/L2 layers, which restricts the effectiveness of data relaying in wireless communication systems.
Innovation Solution
Enhancements to the LTE Rel.13 sidelink functionality include optimized relaying with L1/L2 support, radio-aware candidate relay selection, fast path switching, coordinated resource allocation, and enhanced sidelink operations such as increased data rates, sidelink power control, and optimized HARQ operations to improve data relaying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IP layer relaying is used for network-to-UE communication, then basic relaying functionality is achieved, but data rates are limited and latency is high
Solution Approach 1:
The patent introduces a relay UE as an intermediary device that forwards data between the network and remote UEs. This mediator enables relaying functionality while the underlying physical layer mechanisms are optimized to achieve high data rates, resolving the contradiction between basic relaying capability and high productivity.
Solution Approach 2:
The patent changes key parameters at the physical and link layers including modulation schemes, coding rates, and resource allocation strategies. These parameter changes enable the system to achieve high data rates over the relay link while maintaining reliable communication, thus improving productivity without sacrificing reliability.
2Reliability
If IP layer relaying is used, then relaying is enabled, but latency is high due to lack of L1/L2 optimization
Solution Approach 1:
The patent segments the communication protocol into distinct layers with optimized functions. The physical layer handles time-critical operations like HARQ and resource allocation independently, while higher layers handle routing. This segmentation enables low-latency operations at L1/L2 while maintaining overall system reliability.
Solution Approach 2:
The patent implements preliminary actions at the physical layer including pre-configured resource allocations, pre-computed modulation and coding schemes, and proactive HARQ acknowledgments. These preliminary actions reduce processing delays and enable faster data transmission through the relay, reducing latency while maintaining reliability.
3Adaptability or versatility
If basic sidelink functionality is used, then Public Safety use cases are supported, but data rates are limited
Solution Approach 1:
The patent creates a universal relay framework that can serve multiple functions including Public Safety communications and high-speed data relaying. The same physical layer mechanisms and relay infrastructure support both mission-critical low-rate communications and high-speed data transfer, achieving versatility across different use cases while enabling high productivity where needed.
4Adaptability or versatility
If relay operation is implemented, then network coverage is extended, but resource management becomes complex
Solution Approach 1:
The patent implements feedback mechanisms where relay UEs report channel quality, resource utilization, and link status to the network. The network uses this feedback to dynamically adjust resource allocations, modulation schemes, and routing decisions. This feedback loop simplifies resource management by providing real-time information while enabling extended network coverage through adaptive relay operation.
Data Source
AI summary
There are disclosed methods and apparatus for enabling high data rate relay operation using the D2D air interface including a User Equipment (UE) for transmitting and receiving data via a sidelink interface under control of an Evolved Node B (eNB), the UE comprising: receive circuitry to receive a reference signal on a sidelink interface; control circuitry to determine one or more sidelink quality indicators based on the received reference signal; and transmit circuitry to transmit the determined sidelink quality indicators to the eNB.