CORESET #0 Puncturing for Narrowband PDCCH Reception
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Solution Overview
Problem
Existing 5G NR systems face challenges in supporting narrowband wireless communication scenarios due to limitations in bandwidth, leading to inefficiencies in receiving downlink signals, particularly for use cases like railway mobile communication and utility/infrastructure networks, which require bandwidths less than 5 MHz.
Innovation Solution
A method and device for transmitting and receiving downlink signals in a wireless communication system that involves configuring the CORESET #0 with a puncturing mechanism to align its bandwidth with narrowband channels, using power boosting, and optimizing the CORESET #0 configuration to ensure effective PDCCH reception, even in narrowband scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the CORESET #0 bandwidth is configured to match the narrowband channel bandwidth (less than 5 MHz), then the downlink signal reception becomes feasible for narrowband terminals, but the number of available resource blocks for control channels is reduced
Solution Approach 1:
The patent divides the CORESET #0 into multiple parts: a first set of resource blocks configured for narrowband terminals and a second set for other terminals. This segmentation allows different bandwidth allocations to different terminal types simultaneously, resolving the contradiction between narrowband adaptability and overall resource availability.
Solution Approach 2:
The patent applies local quality by providing differentiated resource block configurations to different terminal groups. Narrowband terminals receive optimized narrowband CORESET #0 configurations, while other terminals receive standard configurations, allowing each group to operate with appropriate bandwidth without compromising the other.
2Reliability
If power boosting is applied to enhance PDCCH reception in narrowband scenarios, then the coverage and reliability are improved, but the overall power consumption and interference to other channels increase
Solution Approach 1:
The patent applies power boosting selectively and partially - only to specific resource blocks allocated to narrowband terminals within CORESET #0, rather than uniformly across all channels. This targeted approach improves narrowband PDCCH reception reliability while minimizing overall power consumption and interference to other channels.
Data Source
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AI summary
There is provided a method performed by a user equipment (UE) in a wireless communication system. The method comprises receiving, from a base station (BS), an MIB including configuration information related to a number of contiguous resource blocks for control resource set (CORESET) #0 through a physical broadcast channel (PBCH) signal; and receiving, from the BS, a physical downlink control channel (PDCCH) through the CORESET #0 including second resource blocks excluding first resource blocks from the resource blocks based on i) the number of resource blocks and ii) a channel bandwidth. A puncturing based on a specific number of first resource blocks among the resource blocks is assumed for the CORESET #0. The PBCH signal includes information of a resource offset related to the CORESET #0, and the PDCCH is received in a search space related to the CORESET #0 based on the resource offset.