PDCCH Monitoring in Collocated Carrier Aggregation Scenarios
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Solution Overview
Problem
In carrier aggregation scenarios, user equipment (UE) faces challenges in effectively monitoring physical downlink control channel (PDCCH) symbols due to uncertainties in collocation and alignment of component carriers, leading to inefficiencies in resource allocation and power management.
Innovation Solution
The base station configures component carriers for UE by providing information on collocation, allowing the UE to select appropriate PDCCH monitoring types based on span patterns and collocation information, thereby optimizing monitoring strategies for aligned or unaligned scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors PDCCH on multiple component carriers without collocation information, then the UE can receive downlink control information from the network, but the UE cannot effectively optimize monitoring strategies due to uncertainties in collocation and alignment
Solution Approach 1:
The base station performs preliminary action by providing collocation information to the UE before the UE executes PDCCH monitoring. This advance information allows the UE to pre-determine appropriate monitoring strategies based on whether component carriers are collocated, eliminating the need for complex real-time decisions and improving monitoring reliability through informed strategy selection.
2Reliability
If the UE uses a conservative PDCCH monitoring approach to ensure reliable reception, then the UE can maintain connection stability, but resource allocation efficiency and power management deteriorate
Solution Approach 1:
The patent applies dynamics by enabling the UE to dynamically adjust PDCCH monitoring strategies based on collocation information. When component carriers are collocated, the UE can use more aggressive, energy-efficient monitoring approaches. When not collocated, the UE switches to more conservative monitoring to maintain reliability. This dynamic adaptation resolves the contradiction between connection stability and power consumption.
3Productivity
If the base station provides detailed collocation information to all UEs, then the UE can optimize PDCCH monitoring strategies, but the signaling overhead and network complexity increase
Solution Approach 1:
The patent applies local quality by providing collocation information selectively rather than universally. The base station determines which UEs receive collocation information based on their specific carrier aggregation configurations and monitoring needs. This targeted approach enables UEs to optimize monitoring strategies where beneficial while minimizing unnecessary signaling overhead for UEs that do not require such optimization.
Data Source
AI summary
A base station of a network provides a user equipment (UE) with information relating to monitoring a Physical Downlink Control Channel (PDCCH) of multiple component carrier (CCs) in a carrier aggregation (CA) scheme. The base station configures a first CC and a second CC of a CA combination for a user equipment (UE) and provides the UE with information for the CA combination, wherein the information comprises an indication whether the first CC and the second CC are collocated.