Multi-Panel QCL Derivation for Short-Latency PDSCH Scheduling
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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.
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 shorter than the DCI parsing latency, then the scheduling efficiency is improved, but the UE cannot obtain QCL-typeD in time for PDSCH reception
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CORESET groups with their respective QCL assumptions before the actual PDSCH reception. When scheduling latency is short, the UE can immediately apply the QCL assumption from the scheduled CORESET group without waiting for DCI parsing to complete, thus resolving the timing conflict between scheduling efficiency and QCL derivation time
2Adaptability or versatility
If multiple CORESET groups are configured for multi-panel transmission, then the beam management capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control resource sets into multiple distinct CORESET groups, where each group is associated with a specific panel and QCL assumption. This segmentation allows the UE to independently manage beam configurations for different panels, improving beam management capability while organizing the complexity into manageable, modular units
Solution Approach 2:
The patent implements universality by designing the CORESET group structure to serve multiple functions: each CORESET group not only provides QCL assumptions for PDSCH reception but also implicitly indicates the active panel, enables fallback mechanisms, and supports both normal and short scheduling latency scenarios. This multi-functionality reduces the need for separate configuration mechanisms
Data Source
AI summary
A method of panel-specific physical uplink control channel (PUCCH) resource selection in multi-panel transmission is disclosed. Capabilities of supporting a multi-transmit-receive point (TRP) operation for supporting simultaneous reception from multiple TRPs and a panel-specific default beam for at least one physical downlink shared channel (PDSCH) reception are reported to a network. A plurality of control resource set (CORESET) groups is obtained from the network, each CORESET group being associated with a TRP and a UE panel. Information for PUCCH resource selection from the network is received via at least one of downlink control information (DCI) or a medium access control (MAC)-control element (CE). A PUCCH resource from the PUCCH resource group indicated in the information is determined based on the CORESET group of a scheduling physical downlink control channel (PDCCH) or the information for PUCCH resource selection. A PUCCH is transmitted using the determined PUCCH resource.