User Terminal QCL Assumption Control for Multi-Panel TRP Throughput
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Solution Overview
Problem
In next-generation radio communication systems like NR, the use of multi-panel/transmission/reception points (TRPs) is not adequately considered, leading to inadequate control of quasi-co-location (QCL) assumptions, which hinders spatial diversity gain and high-rank transmission, thereby suppressing communication throughput.
Innovation Solution
A user terminal and radio communication method that determines quasi-co-location (QCL) assumptions for DMRS ports of PDSCH based on a specific panel ID when the scheduling offset is smaller than a threshold, using TCI-states and CORESET IDs to manage multi-panel/TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current NR specifications are followed without multi-panel/TRP consideration, then system compatibility is maintained, but spatial diversity gain and high-rank transmission cannot be realized, suppressing communication throughput
Solution Approach 1:
The patent introduces dynamic QCL assumption control based on multi-panel/TRP configurations. The base station can dynamically indicate different QCL assumptions for different DMRS ports associated with different panels or TRPs, allowing the system to adapt QCL parameters in real-time according to the actual transmission scenario, thereby enabling spatial diversity gain and high-rank transmission while maintaining system compatibility
Solution Approach 2:
The patent changes the QCL parameter configuration by introducing panel-specific or TRP-specific QCL assumptions. Different QCL parameters (such as spatial Rx parameters) are assigned to different panels or TRPs based on their respective beam directions and channel characteristics. This parameter differentiation enables the system to exploit spatial diversity and achieve higher throughput without compromising compatibility with existing NR specifications
2Reliability
If QCL assumptions are not appropriately controlled in multi-panel/TRP scenarios, then implementation complexity is reduced, but spatial diversity gain and high-rank transmission are hindered
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL parameters for different panels and TRPs before actual data transmission. The base station prepares and indicates the appropriate QCL assumptions in advance through DCI or higher-layer signaling, allowing the UE to pre-establish the correct reception parameters for multi-panel/TRP transmissions. This preliminary configuration ensures reliable spatial diversity exploitation while managing complexity through structured pre-planning
Solution Approach 2:
The patent introduces an intermediary mechanism through the use of TCI states and QCL parameter indications as mediators between the base station and UE. These intermediaries carry the necessary QCL information for multi-panel/TRP scenarios, enabling coordinated control of spatial parameters without requiring direct complex interaction between all system components. The intermediary signaling structure manages complexity while ensuring reliable QCL assumption alignment
Data Source
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AI summary
A user terminal according to one aspect of the present disclosure has a receiving section receiving a plurality of PDSCHs (Physical Downlink Shared Channels), and a control section assuming that when a time offset between reception of corresponding downlink control information and reception of the PDSCH is smaller than a certain threshold value for each PDSCH, demodulation reference signal (DMRS) ports of PDSCH of a serving cell are quasi co-located with reference signal(s) in a TCI (Transmission Configuration Indication) state with respect to QCL parameter(s) used for QCL (Quasi- Co-Location) indication for PDCCH (Physical Downlink Control Channel) of a lowest CORESET-ID of a certain panel ID (Identifier) in a latest slot in which one or more CORESETs (COntrol REsource SETs) within an active BWP (Bandwidth Part) of the serving cell are configured in the user terminal. According to one aspect of the present disclosure, DL communication can be preferably performed even when a multi-panel/TRP is used.