Multi-Slot PDCCH Monitoring for High-SCS NR Control Burden
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Solution Overview
Problem
The challenge in 5G/NR wireless communication systems is the increased PDCCH monitoring burden due to shorter transmission time intervals (TTIs) at higher subcarrier spacings, leading to inefficiencies in PDCCH monitoring overhead and capability scaling issues, particularly for UEs operating with carrier aggregation.
Innovation Solution
Implementing multi-slot PDCCH monitoring capabilities, where UEs and base stations determine and transmit/receive PDCCHs over multiple slots, adjusting the monitoring period to reduce the PDCCH burden and align with higher SCS configurations, thereby supporting efficient PDCCH monitoring across multiple slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If PDCCH monitoring is performed at higher subcarrier spacings with shorter transmission time intervals, then the transmission speed and responsiveness are improved, but the PDCCH monitoring overhead and capability burden increase significantly
Solution Approach 1:
The patent segments the monitoring burden by introducing multi-slot monitoring capability where PDCCH monitoring is distributed across multiple slots rather than concentrated in single slots. This segmentation allows the UE to handle PDCCH blind decodes across X slots with Y slots of actual monitoring, reducing the instantaneous monitoring overhead while maintaining high transmission speed through the use of higher subcarrier spacings.
2Productivity
If PDCCH monitoring is performed more frequently to support shorter TTIs, then the system responsiveness is improved, but the UE capability requirements and complexity increase
Solution Approach 1:
The patent introduces dynamic monitoring capabilities where the UE can adaptively adjust its PDCCH monitoring behavior across multiple slots based on configured parameters X and Y. The monitoring pattern becomes dynamic rather than static, allowing the system to maintain high responsiveness while managing UE capability requirements through flexible monitoring configurations that can be adjusted based on traffic conditions and UE capabilities.
3Ease of manufacture
If single-slot PDCCH monitoring is used, then the implementation is simpler, but the capability to handle high subcarrier spacings and carrier aggregation is insufficient
Solution Approach 1:
The patent creates a universal PDCCH monitoring framework that works across multiple slots and can be applied to various subcarrier spacings and carrier aggregation configurations. The multi-slot monitoring capability with parameters X and Y provides a versatile solution that can handle different SCS values (15kHz, 30kHz, 60kHz, 120kHz) and carrier aggregation scenarios, making the implementation adaptable to future 5G NR requirements while maintaining a unified approach.
Data Source
AI summary
Methods and apparatuses for physical downlink control channel (PDCCH) monitoring per multiple slots. A method for operating a user equipment includes determining a combination (X, Y) of consecutive slots, where X and Y are positive integers with Y<X, and receiving first physical PDCCHs with a first subcarrier spacing (SCS) configuration μ1 within Y slots of X slots. The X slots start from a slot with a number nstart, on a first cell. Here, (nf·Nslotframe,μ<sub2>1</sub2>+nstart)mod X=0, where nf is a frame number and Nslotframe,μ<sub2>1 </sub2>is number of slots per frame for the first SCS configuration μ1.