Carrier Aggregation Search Space Overbooking Allocation
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Solution Overview
Problem
In wireless communications systems, overbooking of search spaces across multiple component carriers in carrier aggregation leads to challenges in scheduling and monitoring downlink control information due to blind decoding and control channel element limitations, resulting in the need to drop or prune control channel candidates.
Innovation Solution
The allocation of control channel candidates across multiple component carriers is managed based on per-CC and CA limits, ensuring that the number of blind decodes or channel estimations aligns with user equipment capabilities, allowing for efficient configuration of search space sets and cross-carrier scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If overbooking of search spaces is configured across multiple component carriers, then the number of configurable control channel candidates exceeds UE capability, but this leads to scheduling challenges and requires dropping control channel candidates
Solution Approach 1:
The patent segments the control channel candidates into different priority levels and applies separate allocation rules for each priority. High-priority candidates are guaranteed allocation while low-priority candidates are subject to dropping when limits are exceeded. This segmentation allows the system to configure more candidates than UE capability while maintaining manageable scheduling through priority-based handling.
2Productivity
If the number of blind decoding candidates is increased beyond UE capability, then more control channel monitoring is possible, but the UE cannot process all configured candidates
Solution Approach 1:
The patent changes the parameter of candidate allocation by introducing dynamic priority-based allocation mechanisms. Instead of uniform allocation, the system adjusts which candidates are allocated based on priority levels and current UE capability status. This allows the system to configure a high number of candidates for monitoring while ensuring reliable processing by allocating only manageable numbers based on actual UE capability.
3Productivity
If search space configurations allow overbooking beyond UE capability, then resource utilization is improved, but channel estimation complexity increases
Solution Approach 1:
The patent applies local quality by assigning different allocation characteristics to different candidate groups based on their priority and configuration. Instead of uniform complex handling of all candidates, the system applies simplified allocation rules to high-priority candidates and different rules to low-priority candidates. This local differentiation reduces overall channel estimation complexity while maintaining good resource utilization.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described that provide for allocation of control channel candidates for multiple component carriers (CCs) in carrier aggregation (CA) communications. A CA limit may correspond to a total number of configurable control channel candidates across multiple CCs. The control channel candidates may include blind decoding (BD) candidates or control channel element (CCE) candidates for channel estimation. A per-CC limit of control channel candidates may correspond to a number of configurable control channel candidates for each CC. An applied set of control channel candidates may be determined by allocating control channel candidates across the multiple CCs based on the CA limit and the per-CC limit. Such techniques may be used in cases where the CCs have a same numerology or mixed numerology, and may also be used for cross-carrier scheduling.