Partial CORESET Handling for PDCCH Reception Beyond UE Bandwidth
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Solution Overview
Problem
In wireless communication systems, UEs with less advanced capabilities face degraded communication performance due to a portion of the frequency domain resource allocation of the CORESET being outside their initial downlink bandwidth, leading to reduced aggregation levels and PDCCH candidate degradation.
Innovation Solution
The UE modifies the resource mapping of the partial CORESET or the initial downlink bandwidth to receive PDCCH messages by identifying the starting RB and extending resource block indices, allowing for improved PDCCH candidate aggregation and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the CORESET frequency domain resource allocation is configured outside the initial downlink bandwidth for UEs with less advanced capability, then the resource utilization of the wireless network is improved, but the UE communication performance is degraded
Solution Approach 1:
The patent segments the CORESET reception process into two parts: the UE receives and processes only the portion of the CORESET that falls within its initial downlink bandwidth, while the network handles or compensates for the portion outside the UE's bandwidth. This segmentation allows the network to utilize the full frequency range while ensuring each UE receives adequate control information within its capability limits.
Solution Approach 2:
The patent modifies the aggregation level parameter dynamically based on the UE's capability and the overlap between the CORESET frequency domain resource allocation and the UE's initial downlink bandwidth. By adjusting this parameter, the system maintains reliable PDCCH reception for UEs with limited bandwidth while allowing the CORESET to extend beyond individual UE bandwidths.
2Quantity of substance
If the CORESET frequency domain resource allocation extends beyond the initial downlink bandwidth, then the network can support more UEs simultaneously, but the aggregation level of PDCCH candidates is reduced
Solution Approach 1:
The patent implements dynamic adjustment of the aggregation level based on the actual overlap between the CORESET frequency domain resource allocation and each UE's initial downlink bandwidth. The aggregation level is not fixed but adapts to the specific UE capability and resource allocation configuration, ensuring adequate PDCCH candidate capacity is maintained even when the CORESET extends beyond individual UE bandwidths.
3Device complexity
If a single CORESET configuration is broadcasted for all UEs, then the system complexity is reduced, but UEs with less advanced capability cannot receive the full CORESET
Solution Approach 1:
The patent creates a universal CORESET configuration that serves multiple UE types simultaneously. The single broadcasted configuration is designed to be partially receivable by all UEs, with the understanding that each UE will receive the portion within its bandwidth. This universal approach avoids the complexity of maintaining separate configurations while ensuring each UE type can successfully receive its applicable control information.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of an initial downlink bandwidth for the UE. The UE may receive, via a master information block (MIB), configuration information for a control resource set (CORESET) associated with physical downlink control channel (PDCCH) monitoring for initial access, where the configuration information indicates a frequency domain resource allocation for the CORESET, and where the frequency domain resource allocation for the CORESET is at least partially outside of the initial downlink bandwidth. The UE may receive one or more PDCCH messages associated with the CORESET based at least in part on at least one of modifying a resource mapping of the CORESET or modifying the initial downlink bandwidth. Numerous other aspects are provided.