Multi-Hop U2N Relay QoS Splitting for Low-Latency RRC Setup
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently and accurately performing multi-hop-based user equipment-to-network (U2N) relay communication, particularly in scenarios requiring enhanced mobile broadband, massive Machine Type Communication, and Ultra-Reliable and Low Latency Communication, such as vehicle-to-everything (V2X) scenarios like vehicle platooning, advanced driving, and remote driving.
Innovation Solution
A method involving user equipment (UE) establishing a direct connection with an intermediate relay UE, transmitting a radio resource control (RRC) setup request message to a base station (BS), and configuring radio link control (RLC) channels based on split Quality of Service (QoS) values for each hop, allowing intermediate relay UEs to operate in RRC idle or inactive states without transitioning to a connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intermediate relay UEs transition to RRC connected state to perform relay communication, then communication reliability is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent introduces a relay UE as an intermediary node that forwards RRC messages between the remote UE and base station. The relay UE maintains RRC idle or inactive state while performing relay functions, acting as a mediator that eliminates the need for the remote UE to directly establish RRC connection, thereby reducing signaling overhead and latency while maintaining communication reliability
Solution Approach 2:
The patent segments the communication path into direct connection (remote UE to relay UE) and indirect connection (relay UE to base station) components. By splitting the communication flow and allowing the relay UE to operate independently in idle/inactive state, the system avoids full RRC connection establishment while maintaining reliable communication through the segmented path
2Device complexity
If QoS parameters are uniformly applied across all hops in multi-hop relay, then system complexity is reduced, but communication accuracy and performance deteriorate
Solution Approach 1:
The patent applies local quality by configuring different QoS parameters (such as PRIORITY, PACKET ERROR RATE, DELAY BUDGET) for each individual hop in the multi-hop relay path. The base station determines hop-specific QoS values and provides them to intermediate relay UEs, allowing each hop to be optimized according to its specific channel conditions and requirements, thereby improving communication performance without excessive complexity
Solution Approach 2:
The patent changes QoS parameters dynamically for each hop based on channel conditions and communication requirements. The base station determines appropriate QoS parameter values for each hop and provides them to the relay UEs, enabling adaptive optimization of communication performance across different hops while maintaining manageable system complexity through standardized parameter management
3Productivity
If direct RRC connection is established between remote UE and base station, then communication efficiency is improved, but coverage area is limited
Solution Approach 1:
The patent uses intermediate relay UEs as mediators to extend coverage area. These relay UEs receive and forward RRC messages between the base station and remote UEs that are outside direct coverage, effectively expanding the service area while maintaining communication efficiency through the relayed connection path
Data Source
AI summary
According to various embodiments, an apparatus may establish a first direct connection with a first intermediate relay user equipment (UE) for UE-to-network (U2N) relay, receive a radio resource control (RRC) setup request message of a remote UE through the first direct connection, transmit the RRC setup request message to a base station (BS), receive, from the BS, a first message including Quality of Service (QoS) information related to the U2N relay, and transmit, to the first intermediate relay UE, a second message including a second split QoS value determined for the first direct connection based on the QoS information.