CORESET 0-RC Configuration for RedCap Initial Access
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Solution Overview
Problem
The existing 5G NR system faces challenges in supporting RedCap UEs with limited channel bandwidth, as they may not be able to access cells with CORESET 0 configurations larger than their maximum supported bandwidth, leading to potential cell barring and coverage issues.
Innovation Solution
The proposed solution involves configuring CORESET 0-RC and search space 0-RC for RedCap UEs, using methods such as configuring via SSB, MIB, or SIB1, to ensure compatibility with RedCap UEs' limited bandwidth capabilities, and enabling repetition of DCI and channels for coverage recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CORESET 0 is configured with large bandwidth to support normal UEs, then network coverage and data rate are improved, but RedCap UEs with limited channel bandwidth cannot access the cell, leading to cell barring
Solution Approach 1:
The patent segments the cell access process by introducing separate CORESET configurations for different UE types. Normal UEs use the original CORESET 0 configuration, while RedCap UEs use a separate CORESET 0-RC with reduced bandwidth. This segmentation allows each UE type to access the cell through its appropriate bandwidth configuration, resolving the contradiction between supporting large bandwidth for normal UEs and small bandwidth for RedCap UEs.
Solution Approach 2:
The patent introduces an intermediary mechanism through SIB1 configuration that provides RedCap-specific access parameters. The SIB1 contains RedCap UE access configuration information that enables RedCap UEs to identify and use the appropriate reduced-bandwidth CORESET 0-RC for initial access, acting as a mediator between the network's large bandwidth configuration and RedCap UEs' limited bandwidth capabilities.
2Length of stationary object
If CORESET 0 bandwidth is reduced to support RedCap UEs, then RedCap UE coverage is improved, but normal UEs may experience degraded performance
Solution Approach 1:
The patent segments the control resource allocation by creating separate CORESET configurations (CORESET 0 for normal UEs, CORESET 0-RC for RedCap UEs) with different bandwidths. This allows each UE type to utilize the appropriate bandwidth configuration, ensuring that RedCap UEs achieve adequate coverage through CORESET 0-RC while normal UEs maintain their data rate performance through the original CORESET 0 configuration.
3Adaptability or versatility
If multiple bandwidth parts are configured for different UE types, then support for diverse UE capabilities is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring RedCap-specific parameters in SIB1 before RedCap UEs attempt access. The SIB1 contains RedCap UE access configuration information including the reduced bandwidth CORESET 0-RC configuration, allowing RedCap UEs to immediately identify and use the appropriate configuration without requiring complex runtime determination or additional signaling exchanges.
Data Source
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AI summary
A method of initial access for a user equipment (UE) is provided. The method includes receiving a master information block (MIB), for configuring a first control resource set (CORESET) with physical resource blocks (PRBs) of a first DL BWP, in a synchronization signal block (SSB), receiving a radio resource control (RRC) configuration in the first DL bandwidth part (BWP) carrying a configuration for a second CORESET, and a configuration for a first search space associated with the second CORESET, transmitting, to a cell, a physical random access channel (PRACH) preamble in an initial UL BWP, and receiving downlink control information (DCI) in the first search space and a physical downlink shared channel (PDSCH) carrying a random access response scheduled by the DCI in a second DL BWP, wherein the second DL BWP is determined by the frequency resources of the second CORESET.