Cross-Carrier Scheduling PDCCH Blind Decoding Limits
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing cross-carrier scheduling for efficient resource allocation and interference management between primary and secondary cells, leading to suboptimal performance in terms of blind decoding capabilities and control channel element utilization.
Innovation Solution
The method involves configuring a base station to set thresholds for the maximum number of blind decodes and non-overlapping control channel elements for PDCCH candidates across cells, allowing user equipment to perform blind decoding within scheduled limits and report capabilities, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented to optimize resource allocation, then resource utilization efficiency is improved, but blind decoding complexity and control channel element utilization conflicts increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of PDCCH candidates and non-overlapping CCEs based on scheduling cell limits. The base station configures different thresholds for blind decoding attempts and CCE usage on serving cells, adapting these parameters to balance resource allocation efficiency with UE processing capabilities, thereby resolving the contradiction between improved resource utilization and reduced blind decoding complexity.
Solution Approach 2:
The patent implements dynamics by introducing configurable thresholds that allow the system to adaptively control PDCCH monitoring behavior. The base station can dynamically adjust the number of blind decoding attempts and CCE allocations based on current network conditions and UE capabilities, enabling the system to optimize resource allocation while preventing excessive blind decoding complexity in real-time.
2Adaptability or versatility
If the number of PDCCH candidates is increased to improve scheduling flexibility, then scheduling capability is improved, but interference between cells and processing overhead increase
Solution Approach 1:
The patent applies local quality by implementing cell-specific scheduling limits and thresholds. Each serving cell can be configured with individualized limits on PDCCH candidates and non-overlapping CCEs, allowing the system to optimize scheduling flexibility locally on each cell while controlling interference through localized resource allocation constraints rather than uniform system-wide parameters.
Data Source
AI summary
A base station may configure a first threshold indicating maximum numbers of blind decodes (BDs) and non-overlapping control channel elements (CCEs) for physical downlink control channel (PDCCH) candidates on a primary cell (PCell)/primary secondary cell (PSCell), and transmit, for a user equipment (UE), a configuration for PDCCH candidates in common search spaces (CSSs) or user-specific search spaces (USSs) on the PCell/PSCell and USSs on a secondary cell (SCell) for PDCCH scheduling data for the PCell/PSCell. The base station may transmit at least one PDCCH in PDCCH candidates. The UE may receive the configuration and receive the PDCCH by blindly decoding the PDCCH candidates in in at least one of the CSSs or the USSs configured on the PCell/PSCell and the USSs configured on the Scell. The USSs configured on the PCell/PSCell may support PDCCH overbooking.