Multi-Hop CSI Reporting for Relay UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current user equipment cooperation technologies in communication systems are limited in obtaining the channel state of multi-hop paths, particularly when data needs to be relayed from a base station to a UE outside its coverage area, as existing methods do not effectively report the comprehensive channel state of such paths.
Innovation Solution
A method and apparatus for reporting CSI (Channel State Information) of a multi-hop path, where a source device obtains a joint or multi-level CSI report that indicates the channel state of each transmission link in the path, using a function defined based on node connection relationships, and triggers reporting based on preset conditions to ensure reliable data transmission and efficient spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data is relayed through multiple hops from base station to out-of-coverage UE, then network coverage is extended, but the channel state information of the multi-hop path cannot be obtained
Solution Approach 1:
The patent segments the multi-hop transmission path into multiple individual links (first hop from base station to relay UE, second hop from relay UE to target UE). Each link's CSI is measured and reported separately, allowing the source device to obtain comprehensive channel state information for the entire multi-hop path by combining the CSI of individual segments.
Solution Approach 2:
The relay UE acts as an intermediary that not only forwards data but also measures and reports CSI for both the first hop (from base station) and the second hop (to target UE). This intermediary role enables the collection of channel state information across multiple hops without requiring direct measurement at the target UE.
2Reliability
If joint CSI report of multi-hop path is implemented, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the CSI reporting of multiple hops into a unified joint CSI report. Instead of separate reporting mechanisms for each hop, the relay UE combines the CSI information of the first hop and second hop into a single joint report that includes channel quality indicators for the entire multi-hop path, reducing the number of separate signaling messages.
Solution Approach 2:
The joint CSI report structure is designed to be universal, accommodating both single-hop and multi-hop scenarios. The reporting mechanism can adapt to different path configurations (direct or relayed) and provides comprehensive channel state information in a standardized format that can be used for various transmission decisions.
3Adaptability or versatility
If comprehensive channel state of multi-hop path is obtained, then transmission path selection is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary CSI measurement and reporting before actual data transmission. The relay UE measures the channel conditions of both hops and reports the joint CSI in advance, allowing the base station to make informed transmission path selections and parameter configurations before initiating data transfer, thus avoiding complex real-time decisions during transmission.
Solution Approach 2:
The patent implements a feedback mechanism where the relay UE continuously monitors and reports joint CSI of the multi-hop path to the base station. This feedback enables the base station to adaptively adjust transmission parameters such as modulation and coding schemes, power allocation, and resource assignment based on the actual channel conditions, improving path selection without requiring complex centralized control.
Data Source
AI summary
Embodiments of this application disclose a method for reporting CSI of a multi-hop path and a related apparatus. The method includes: The multi-hop path includes a first device, a second device, and a third device, where the first device is a source device, and the second device is a target device. The first device obtains a first CSI report of a target transmission path. The first CSI report indicates the target transmission path. According to embodiments of this application, so that a comprehensive channel state of the multi-hop path can be obtained from a data sending device, namely, the source device, by reporting first CSI.