UE Beam Collision Handling for QCL-Based Channel Priority
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Solution Overview
Problem
Existing specifications in NR Rel. 15/16 do not adequately address the constraints imposed when a user equipment (UE) is capable of receiving multiple beams simultaneously, leading to potential throughput reduction and degraded communication quality due to unhandled collisions between channels/signals of different QCL type D.
Innovation Solution
A terminal and base station are designed to handle collisions between downlink shared channels and control channels by prioritizing the reception of the control channel under specific conditions, allowing simultaneous reception of multiple beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE gives priority to reception of PDCCH over PDSCH when channels overlap, then control channel reception reliability is improved, but data channel reception is lost and throughput deteriorates
Solution Approach 1:
The patent applies dynamics by making the priority rule configurable rather than fixed. The network can dynamically adjust the priority relationship between PDCCH and PDSCH based on current channel conditions, traffic requirements, and UE capabilities. This allows the system to adapt between prioritizing control reliability or data throughput depending on operational context
Solution Approach 2:
The patent changes the parameter of channel priority from a fixed specification rule to a configurable parameter. By introducing configuration options that allow the UE to be instructed on which channel to prioritize, the system can adjust this parameter based on real-time conditions, resolving the contradiction between control reliability and data throughput
2Productivity
If the UE receives both PDCCH and PDSCH simultaneously when channels overlap, then throughput is improved, but control channel reception reliability deteriorates
Solution Approach 1:
The patent makes the reception strategy dynamic by allowing the network to configure whether the UE should receive both channels simultaneously or prioritize one channel. This dynamic configuration enables the system to optimize for throughput when control reliability is sufficiently high, or for reliability when conditions demand it
Solution Approach 2:
The patent transforms the fixed parameter of simultaneous reception capability into a configurable parameter. The network can instruct the UE to enable or disable simultaneous PDCCH and PDSCH reception based on current operational requirements, allowing optimization of the throughput-reliability tradeoff
3Device complexity
If constraints are imposed on collision between channels of different QCL type D, then reception complexity is reduced, but transmission/reception capability is limited and communication quality deteriorates
Solution Approach 1:
The patent applies dynamics by making QCL type D constraints configurable rather than fixed. The network can dynamically adjust whether QCL type D constraints are applied based on UE capabilities, channel conditions, and service requirements. This allows the system to relax constraints when UE capability supports it, improving communication quality without excessive complexity
Solution Approach 2:
The patent changes the QCL type D constraint from a fixed specification requirement to a configurable parameter. The network can instruct the UE to apply or relax QCL type D constraints based on current operational needs, allowing optimization of the complexity-communication quality tradeoff
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that, if scheduling offset between reception of a downlink control channel for communication of downlink control information for scheduling an aperiodic channel state information-reference signal (A-CSI-RS) and reception of the A-CSI-RS is less than a threshold determined on the basis of a reported period value for beam switch, and there is a different downlink signal in the same symbol as the A-CSI-RS, and the A-CSI-RS and the different downlink signal are related to the same control resource set (CORESET) pool index, gives priority to quasi-co-location (QCL) for the different downlink signal; and a receiving section that receives the A-CSI-RS. According to one aspect of the present disclosure, collision between a plurality of channels/signals can be handled appropriately.