Multi-Path Relay Transmission Using Uu Link Quality Reports
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Solution Overview
Problem
In multi-path relaying scenarios, user equipment (UE) lacks information on the channel quality of the Uu link between a relay node and a base station, hindering optimal path selection for data transmission.
Innovation Solution
The UE receives information reports from relay nodes or the base station about channel quality, load, and power consumption to select the best path for data transmission, considering both direct and indirect paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-path relaying is configured with indirect paths through relay nodes, then path selection flexibility is improved, but the UE lacks channel quality information of the Uu link between relay node and base station
Solution Approach 1:
The relay node acts as an intermediary that collects channel quality information from the base station via backhaul links and forwards this information to the UE through sidelink. This mediator approach enables the UE to obtain previously unavailable Uu link channel quality information, allowing informed path selection between direct and indirect paths.
Solution Approach 2:
The channel quality information is segmented into two components: the sidelink channel quality (UE to relay node) obtained through direct measurement, and the backhaul link channel quality (relay node to base station) obtained through the relay node's reporting. The UE combines these segmented information pieces to evaluate the overall indirect path quality.
2Measurement precision
If the UE requests and processes information reports from relay nodes, then path selection accuracy is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The base station pre-configures the UE with multiple candidate relay node identifiers and necessary measurement parameters before the UE needs to make path selection. This preliminary configuration reduces the complexity of real-time information request and processing, as the UE already has the necessary framework to evaluate indirect paths.
Solution Approach 2:
The UE requests information reports only for a subset of candidate relay nodes rather than all possible relay nodes, or requests reports only when specific triggering conditions are met (e.g., direct path quality degrades below a threshold). This partial action approach balances path selection accuracy with signaling overhead reduction.
Data Source
AI summary
Embodiments of the present application are related to methods and apparatuses for multi-path transmission. An embodiment of the present application provides a user equipment (UE) including: a transceiver configured to receive one or more information reports about one or more relay nodes from a base station (BS) or the one or more relay nodes; and a processor coupled to the transceiver and configured to: select at least one path for data transmission from two or more paths between the UE and the BS based at least in part on the obtained one or more information reports, wherein the two or more paths include one or more indirect paths corresponding to the one or more relay nodes and at least one direct path between the UE and the BS.