Low-BW CORESET-0 Resource Grid Segmentation for Legacy UE Coexistence
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Solution Overview
Problem
Low-tier UEs in wireless communication systems face challenges in decoding PDCCH due to their limited reception bandwidth, which exceeds the bandwidth of the CORESET-0, preventing them from receiving all necessary CCEs, and existing solutions require additional signaling to legacy UEs, disrupting their operations.
Innovation Solution
Configuring a low-BW CORESET-0 with overlapping and non-overlapping resource grids that can be identified by low-tier UEs from system configuration information without additional signaling to legacy UEs, allowing them to decode PDCCH candidates from a resource grid group, and optimizing resource utilization by time-division-multiplexing additional RGs with legacy CORESET-0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a legacy CORESET-0 is configured with standard bandwidth, then legacy UEs can decode PDCCH normally, but low-tier UEs with limited reception bandwidth cannot receive all necessary CCEs
Solution Approach 1:
The CORESET-0 resource grid is segmented into multiple parts: an overlapping resource grid that both legacy and low-tier UEs can access, and additional non-overlapping resource grids that provide extended functionality. This segmentation allows low-tier UEs to operate within their bandwidth constraints while legacy UEs maintain full access to the complete resource grid.
Solution Approach 2:
Different portions of the CORESET-0 resource grid are assigned different qualities or functions. The overlapping resource grid provides basic PDCCH functionality accessible to all UEs, while additional resource grids provide enhanced capabilities for low-tier UEs. This local differentiation enables each UE type to utilize the most appropriate resources for its capabilities.
2Reliability
If additional resource grids are added for low-tier UEs, then low-tier UE performance improves, but resource utilization efficiency decreases
Solution Approach 1:
The overlapping resource grid serves dual purposes: it provides PDCCH resources for legacy UEs and simultaneously serves as the foundation for low-tier UE operations. By merging these functions into a single shared resource grid, the system avoids duplicating resources and improves overall utilization efficiency while still supporting both UE types.
Solution Approach 2:
The overlapping resource grid is designed to be universal, serving multiple functions: it acts as the complete CORESET-0 for legacy UEs, while also serving as a subset for low-tier UEs. This multi-functionality eliminates the need for separate dedicated resources for each UE type, thereby improving resource utilization efficiency.
3Adaptability or versatility
If separate resource grids are allocated for low-tier and legacy UEs, then each UE type can operate independently, but device complexity and signaling overhead increase
Solution Approach 1:
The CORESET-0 configuration is made dynamic through the use of a parameter indicating whether additional resource grids are present. Low-tier UEs interpret this parameter to determine their applicable resource grids, while legacy UEs ignore it and use the standard configuration. This dynamic interpretation approach enables multi-UE type support without requiring separate static configurations for each UE type.
Solution Approach 2:
Different UE types autonomously determine their applicable resource grids based on their capabilities and the transmitted parameter. Low-tier UEs self-configure by identifying the overlapping resource grid plus additional grids, while legacy UEs self-configure by using only the overlapping resource grid as their complete CORESET-0. This self-service mechanism eliminates the need for complex dedicated signaling to each UE type.
Data Source
AI summary
Aspects are provided which allow a user equipment (UE) to identify a low-bandwidth (low-BW) CORESET-0 and associated CSS based on reception bandwidth of the UE. The base station may configure different frequency and time-domain resources of the low-BW CORESET in order to optimize resource utilization of the low-BW CORESET-0, and the low-tier UE may identify these resources of CORESET-0 and CSS from the system configuration information received in a master information block (MIB). As a result, low tier UEs may operate in a same cell as legacy UEs without the need for the base station to transmit additional signaling to either legacy UEs or lower tier UEs for the UEs to receive their respective CORESET-0's and identify a physical downlink channel (PDCCH).