Shared-Spectrum CORESET Scheduling for Multi-RAT Coexistence
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Solution Overview
Problem
Existing wireless systems face challenges in efficiently utilizing shared spectrum due to interference and inefficiencies in existing wireless systems, particularly in 5G/NR communication systems, especially in shared spectrum environments.
Innovation Solution
The method involves a user equipment (UE) that includes a transceiver configured to receive a master information block (MIB) that indicates a control resource set (CORESET) for receptions of physical downlink control channels (PDCCHs), and a second PDCCH in the CORESET, the first PDCCH provides a first downlink control information (DCI) that schedules transmission of a first physical downlink control channel (PDSCH) that provides a first system information block (SIB), and a second PDSCH that provides a second SIB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless systems share the same spectrum, then spectrum utilization efficiency is improved, but interference between systems increases
Solution Approach 1:
The patent segments the shared spectrum resources by creating separate control resource sets (CORESETs) for different radio access technologies. Each CORESET is configured with specific parameters including frequency location, bandwidth, and cyclic shift values that are RAT-specific. This segmentation allows 5G NR and 4G LTE systems to operate in the same spectrum without interfering with each other's control channels, thereby maintaining high spectrum utilization while eliminating interference.
2Device complexity
If a single CORESET is used for multiple RATs, then device complexity is reduced, but reliability of control channel reception deteriorates
Solution Approach 1:
The patent applies local quality by configuring different CORESET parameters specifically for each RAT type. The base station configures CORESETs with RAT-specific characteristics including different cyclic shift values (e.g., 0 for LTE, 3 for NR), different frequency locations, and different bandwidths. This allows each RAT to have optimized control channel parameters tailored to its specific requirements, ensuring reliable control channel reception for both 5G NR and 4G LTE systems while maintaining manageable device complexity through standardized configuration procedures.
Data Source
AI summary
Apparatuses and methods related to coexistence of wireless systems in shared spectrum in a wireless communication system. A method for a user equipment (UE) includes receiving a master information block (MIB) that indicates a control resource set (CORESET) for receptions of physical downlink control channels (PDCCHs), receiving a first PDCCH in the CORESET, and receiving a second PDCCH in the CORESET. The first and second PDCCHs provide a first and second downlink control information (DCI) formats, respectively, that schedule reception of first and second physical downlink shared channel (PDSCHs), respectively. The method further includes determining to receive the first PDSCH when the UE operates according to a first radio access technology (RAT) or to receive the second PDSCH when the UE operates according to a second RAT and receiving the first PDSCH or the second PDSCH.