PDCCH CORESET Mapping for eRedCap UE Bandwidth Limits
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Solution Overview
Problem
Existing LTE and NB-IoT technologies cannot meet the high data rate and low latency requirements of IoT services such as video surveillance, smart homes, and industrial sensor monitoring, necessitating the introduction of Reduced Capability UE (RedCap UE) and enhanced RedCap UE (eRedCap UE) in 5G NR, which require improved configurations for the control resource set (CORESET) of the physical downlink control channel (PDCCH) due to reduced bandwidth.
Innovation Solution
Configuring a first CORESET for eRedCap UE with a frequency domain width greater than its receiving bandwidth and implementing a corresponding PDCCH resource mapping scheme, allowing eRedCap UE to utilize the same CORESET structure as normal bandwidth terminals without altering the existing CORESET structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the CORESET frequency domain width is reduced to match eRedCap UE receiving bandwidth, then the terminal bandwidth reduction is achieved, but the PDCCH coverage and resource utilization deteriorate
Solution Approach 1:
The patent segments the CORESET configuration into two independent dimensions: frequency domain width (which can be large) and time domain duration (which can be extended). This allows the frequency domain to maintain sufficient resource width for good coverage, while the time domain compensates for the reduced terminal bandwidth through longer transmission duration, thereby resolving the contradiction between bandwidth reduction and coverage maintenance
Solution Approach 2:
The patent transitions from a single-dimensional (frequency domain only) CORESET configuration to a two-dimensional (frequency domain + time domain) configuration. By extending the time domain duration of CORESET, the patent provides an additional dimension for resource allocation, allowing the system to maintain adequate PDCCH coverage even when the frequency domain width is constrained by reduced terminal bandwidth
2Quantity of substance
If the CORESET frequency domain width is reduced for eRedCap UE, then the bandwidth consumption is reduced, but the frequency resource utilization deteriorates
Solution Approach 1:
The patent introduces dynamic configuration of CORESET time domain duration based on terminal type and service requirements. For eRedCap UE with reduced bandwidth, the system can dynamically extend the time domain duration to maintain adequate resource utilization, while for normal terminals with full bandwidth, the standard configuration is used. This dynamic adjustment optimizes frequency resource utilization across different terminal types and service scenarios
3Adaptability or versatility
If a separate CORESET structure is designed for eRedCap UE, then the bandwidth adaptation is achieved, but the system complexity increases
Solution Approach 1:
The patent designs a universal CORESET configuration framework that serves both normal terminals and eRedCap UE through a common structure. The key parameter (time domain duration) is made configurable based on terminal type, allowing the same CORESET structure to adapt to different bandwidth requirements without requiring separate design frameworks, thereby maintaining system simplicity while achieving bandwidth adaptation
Data Source
AI summary
A downlink transmission method is performed by a network device and includes: configuring a first control resource set (CORESET) of a physical downlink control channel (PDCCH) for a first type of terminal, wherein a frequency domain width of the first CORESET is greater than a receiving bandwidth of a control channel supported by the first type of terminal.