Subband CORESET Monitoring for Unlicensed PDCCH Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing wireless signal transmission and reception, particularly in managing physical downlink control channels (PDCCH) across multiple subbands in a bandwidth part (BWP), which affects communication reliability and capacity, especially in unlicensed cell operations.
Innovation Solution
The method involves monitoring PDCCH candidates on a subband basis within a BWP, detecting PDCCH, and configuring control resource sets (CORESETs) that are repeated across subbands, with Listen-Before-Talk (LBT) performed on individual subbands to optimize resource allocation and channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH candidates are monitored on a subband basis in unlicensed cells, then channel access reliability is improved through LBT, but device complexity increases due to multiple CORESET configurations
Solution Approach 1:
The bandwidth part is divided into multiple subbands, with each subband having its own CORESET configuration. This segmentation allows independent LBT operations on each subband, improving channel access reliability while distributing the complexity across multiple smaller units rather than one large complex system
Solution Approach 2:
Multiple CORESETs are configured to serve the same search space, allowing the system to universally handle PDCCH monitoring across different subbands. This multi-functionality enables the same search space to be monitored through multiple CORESET configurations, providing redundancy and reliability while using standardized procedures
2Productivity
If multiple CORESETs are configured for the same search space, then communication capacity is improved through redundant monitoring, but information processing overhead increases
Solution Approach 1:
Multiple CORESETs are merged to serve a single search space, combining their monitoring capabilities to improve communication capacity. The UE monitors PDCCH candidates across multiple CORESETs but processes them within a unified search space framework, reducing information processing overhead through consolidated handling
3Adaptability or versatility
If LBT is performed on individual subbands, then spectrum utilization is improved through selective access, but time consumption increases due to multiple LBT procedures
Solution Approach 1:
The frequency spectrum is segmented into multiple subbands, each undergoing independent LBT procedures. This allows selective access to available subbands, improving spectrum utilization by transmitting only on subbands that pass LBT, while the time penalty is distributed across parallel or selective subband assessments rather than a single comprehensive check
Data Source
AI summary
The present invention relates to a wireless communication system and, particularly, to a method and a device therefor, the method comprising the steps of: monitoring a PDCCH candidate in an SS in units of sub-bands in a BWP including a plurality of sub-bands; and on the basis of the monitoring, detecting a PDCCH, wherein, in the BWP, the same CORESET is repeated per sub-band in a frequency domain, and a plurality of CORESETs included in the plurality of sub-bands are associated with the same SS.