Terminal Uplink Muting Resources for Accurate CLI Measurement
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Solution Overview
Problem
Existing technologies lack an effective method for accurately measuring interference between base stations in Dynamic/flexible TDD operations, leading to degraded reception performance due to cross-link interference.
Innovation Solution
Implementing a non-transparent scheme for configuring and indicating muting resources at the terminal and base station level, using bitmaps and resource configurations for UL transmission, to exclude UL signals during CLI measurement, thereby enhancing measurement accuracy and resource utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmission is performed in all allocated frequency resources, then resource utilization efficiency is improved, but measurement precision of cross-link interference deteriorates due to UL signal interference
Solution Approach 1:
The frequency resources allocated for uplink transmission are segmented into two distinct parts: a first frequency resource configured as a muting resource where uplink transmission is prohibited, and a second frequency resource where uplink transmission is permitted. This segmentation enables the terminal to maintain accurate CLI measurements on the muting resource while preserving resource utilization efficiency through normal uplink transmission on the second frequency resource.
Solution Approach 2:
Different quality characteristics are applied to different frequency resources: the first frequency resource (muting resource) is characterized by the absence of uplink transmission to ensure measurement precision, while the second frequency resource allows normal uplink transmission for optimal resource utilization. This local differentiation resolves the contradiction by applying appropriate transmission characteristics to specific frequency regions.
2Measurement precision
If muting resources are configured to exclude uplink transmission, then measurement precision of cross-link interference is improved, but resource utilization efficiency deteriorates due to reduced available transmission resources
Solution Approach 1:
The frequency resources are divided into a first frequency resource designated as muting resource and a second frequency resource for normal uplink transmission. This segmentation ensures that CLI measurements can be performed with high precision on the muting resource while maintaining efficient resource utilization through uninterrupted uplink transmission on the second frequency resource, thereby resolving the contradiction between measurement precision and resource utilization efficiency.
Solution Approach 2:
Instead of muting all uplink transmission resources, only a partial portion (the first frequency resource) is configured as muting resource. This partial action approach ensures sufficient resources are available for accurate CLI measurements while preserving the majority of frequency resources for normal uplink transmission, thus balancing measurement precision requirements with resource utilization efficiency.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
This terminal comprises: a control circuit that, among first frequency resources allocated to uplink transmission in a certain time resource, configures a second frequency resource in which no uplink transmission is performed on the basis of notification information; and a transmission circuit that performs uplink transmission on the basis of the second frequency resource.