Multi-Panel QCL Assumptions for Low-Latency PDSCH Reception
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in deriving Quasi-CoLocation (QCL) assumptions for physical downlink shared channel (PDSCH) reception when the scheduling latency is shorter than the downlink control information (DCI) parsing latency, leading to inadequate beam management for multi-panel transmission.
Innovation Solution
The UE determines a default QCL assumption for DM-RS ports of PDSCH reception by obtaining multiple control resource set (CORESET) groups and applying a default QCL assumption when the time offset between DCI reception and PDSCH reception is less than a threshold, using RRC signaling to configure CORESET groups and indicating QCL assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the PDSCH scheduling latency is reduced to improve transmission efficiency, then the productivity increases, but the UE cannot obtain QCL-typeD in time for PDSCH reception, worsening the reliability
Solution Approach 1:
The patent applies preliminary action by configuring default QCL assumptions in advance through RRC signaling before the actual PDSCH reception occurs. The UE is pre-configured with defaultBeamIndicator and qcl-TypeD-DefaultBeam parameters that can be immediately applied when scheduling latency is too short for dynamic QCL indication, ensuring reliable PDSCH reception without compromising scheduling efficiency
Solution Approach 2:
The patent introduces an intermediary mechanism by using a default QCL assumption as a fallback when the dynamically indicated QCL-typeD is not available in time. The defaultBeamIndicator acts as an intermediary reference that bridges the gap between scheduling decisions and beam configuration, allowing the UE to proceed with PDSCH reception using a pre-configured beam when time is insufficient for parsing DCI
2Adaptability or versatility
If multiple CORESET groups are configured to support multi-panel transmission, then the adaptability improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing CORESETs into multiple CORESET groups (first CORESET group and second CORESET group), where each group can be associated with different QCL assumptions and panels. This segmentation allows the UE to handle multi-panel transmission by selectively applying different default QCL assumptions from different CORESET groups, making the complex multi-panel capability manageable through structured organization
Solution Approach 2:
The patent implements universality by designing the default QCL assumption mechanism to serve multiple functions: it works for both single-panel and multi-panel transmission scenarios, and can be applied regardless of whether the scheduling latency is sufficient for dynamic QCL indication. The same defaultBeamIndicator mechanism provides fallback QCL assumptions for both normal and urgent scheduling cases, simplifying the overall system design
Data Source
AI summary
A method of deriving a Quasi-CoLocation (QCL) assumption for a user equipment (UE) in multi-panel transmission is disclosed. The method comprises obtaining a plurality of control resource set (CORESET) groups from a network of the wireless communication system, determining a default QCL assumption for demodulation reference signal (DM-RS) port(s) of at least one physical downlink share channel (PDSCH), reception scheduled by a scheduling physical downlink control channel (PDCCH) according to a CORESET of one of the plurality of CORESET groups when a time offset between a reception of downlink control information (DCI), in the scheduling PDCCH and the at least one PDSCH reception is less than a threshold, wherein at least one of the plurality of CORESET groups includes at least one CORESET for indicating a QCL assumption, and applying the default QCL assumption for reception of the DM-RS port(s) of the at least one PDSCH.