NR PDCCH Resource Adjustment for LTE CRS Interference
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Solution Overview
Problem
The coexistence of LTE and NR systems in the same spectrum is hindered by the continuous transmission of LTE CRS, which interferes with the NR PDCCH, leading to restricted transmission performance and scheduling flexibility for NR PDCCH.
Innovation Solution
A method is introduced where a network-side device determines conflicting resource elements between LTE CRS and NR PDCCH, adjusts the NR PDCCH resource to obtain a non-conflicting third resource, and transmits NR PDCCH related information on this adjusted resource.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE CRS is continuously transmitted to maintain LTE system operation, then LTE system reliability is improved, but NR PDCCH transmission performance deteriorates due to interference
Solution Approach 1:
The patent segments the time-frequency resources by identifying and separating conflicting resource elements between LTE CRS and NR PDCCH. The network device determines the first resource occupied by LTE CRS and the second resource occupied by NR PDCCH, then identifies conflicting resource elements to avoid using them for NR PDCCH transmission, thereby reducing interference while maintaining both systems.
Solution Approach 2:
The patent applies local quality adjustment by modifying the resource allocation specifically in the conflicting regions. Instead of uniformly reducing NR PDCCH resources, the network device adjusts only the resource elements that conflict with LTE CRS, preserving non-conflicting resources for NR PDCCH transmission and maintaining overall system performance.
2Object-affected harmful factors
If NR PDCCH resources are reduced to avoid LTE CRS interference, then interference impact is reduced, but transmission performance and scheduling flexibility deteriorate
Solution Approach 1:
The patent segments the NR PDCCH resources to distinguish between conflicting and non-conflicting resource elements. By identifying only the conflicting resource elements and adjusting only those, the system preserves the majority of NR PDCCH resources for transmission, maintaining transmission performance and scheduling flexibility while eliminating interference issues.
Solution Approach 2:
The patent changes the resource allocation parameters dynamically by determining the actual conflicting resource elements between LTE CRS and NR PDCCH. This allows the system to adapt the NR PDCCH resource configuration based on the specific interference pattern, optimizing transmission performance rather than using a fixed reduced resource allocation.
3Object-affected harmful factors
If NR PDCCH resources are reduced to avoid LTE CRS interference, then interference impact is reduced, but scheduling flexibility deteriorates
Solution Approach 1:
The patent segments the resource space to identify specific conflicting resource elements rather than reducing all NR PDCCH resources. This selective approach maintains scheduling flexibility by allowing the network device to allocate NR PDCCH resources in the non-conflicting portions of the time-frequency grid, preserving adaptability in resource allocation.
Solution Approach 2:
The patent introduces dynamic resource allocation by determining conflicting resource elements based on actual LTE CRS and NR PDCCH configurations. This allows the system to adaptively adjust NR PDCCH resources in response to changing interference conditions, maintaining scheduling flexibility rather than using a static reduced resource allocation.
Data Source
AI summary
A method, apparatus and transitory computer-readable storage medium for transmitting a physical downlink control channel (PDCCH). The transmitting of PDCCH is performed by: determining a first resource occupied by a long term evolution cell-specific reference signal (LTE CRS) and a second resource occupied by new radio physical downlink control channel (NR PDCCH) related information to be transmitted; determining that at least one resource element (RE) in the second resource conflicts with the first resource; adjusting the second resource and obtaining a third resource, wherein the third resource does not conflict with the first resource; and transmitting the NR PDCCH related information to a terminal on the third resource.