Cross-Carrier Scheduling Across Active BWPs in NR Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing bandwidth parts (BWPs) in New Radio (NR) systems, particularly in scenarios involving cross-carrier scheduling and self-scheduling, leading to suboptimal resource allocation and increased latency.
Innovation Solution
The implementation of cross-carrier scheduling and self-scheduling mechanisms that adapt to multiple bandwidth parts, utilizing search space configurations and TRP configurations to optimize resource allocation and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented with multiple bandwidth parts, then resource allocation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the bandwidth spectrum into multiple bandwidth parts (BWPs), each independently configurable and schedulable. This segmentation allows the system to allocate resources more efficiently by assigning different BWPs to different users or services based on their specific requirements, thereby improving resource allocation efficiency while managing complexity through modular organization
Solution Approach 2:
The patent implements dynamic BWP configuration and switching mechanisms where bandwidth parts can be activated, deactivated, and reconfigured based on real-time network conditions and user requirements. This dynamic approach enables the system to adapt resource allocation to changing demands, improving overall efficiency while the standardized dynamic management procedures help control device complexity
2Loss of time
If multiple bandwidth parts are configured for cross-carrier scheduling, then latency is reduced, but search space configuration complexity increases
Solution Approach 1:
The patent pre-configures multiple bandwidth parts and their associated search spaces before actual data transmission occurs. By having BWPs and search spaces ready in advance with predefined parameters and associations, the system can quickly activate appropriate configurations without real-time computation, thereby reducing latency while the preliminary organization simplifies the overall configuration management
Solution Approach 2:
The patent introduces search space configurations as intermediary structures that link control resources to bandwidth parts. These search spaces act as mediators that organize and manage the relationships between multiple BWPs and their scheduling parameters, reducing the direct complexity of configuring cross-carrier scheduling while enabling faster resource allocation through pre-established search space templates
Data Source
AI summary
A wireless device may receive one or more radio resource control (RRC) messages comprising a first parameter indicating that a first cell is cross-carrier scheduled by a second cell, and one or more second parameters indicating one or more first physical downlink control channel (PDCCH) candidates on a first bandwidth part (BWP) of the first cell. The wireless device may monitor, on the second cell, one or more second PDCCH candidates for cross-carrier scheduling the first cell. The wireless device may receive downlink control information indicating an active BWP switching from a first BWP to a second BWP of the second cell. Based on the active BWP switching, the wireless device may stop monitoring the one or more second PDCCH candidates on the second cell and monitor the one or more first PDCCH candidates on the first BWP of the first cell for self-scheduling the first cell.