UE-to-UE Subcarrier Spacing Alignment for Cross-Link Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current techniques for managing cross-link interference (CLI) in TDD systems result in inefficient use of communication resources due to UEs having different subcarrier spacings (SCS) configurations, leading to unsuccessful CLI measurements.
Innovation Solution
Configuring UEs with transmission and reception parameters to align uplink and downlink SCS, including adjusting frequency domain combs, comb offsets, and symbol durations to enable successful CLI measurements, even when UEs have different SCS configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs are configured with independent and separate SCS for uplink and downlink communications, then communication flexibility and adaptability are improved, but CLI measurement reliability deteriorates when uplink SCS of aggressor UE does not match downlink SCS of victim UE
Solution Approach 1:
The patent introduces a new parameter called 'reference SCS' that serves as a common reference for both uplink and downlink SCS configurations. This parameter change enables the system to handle mismatched SCS configurations by establishing a unified reference framework, thereby maintaining CLI measurement reliability while preserving communication flexibility.
Solution Approach 2:
The patent introduces a base station as an intermediary entity that receives CLI measurement reports from victim UEs and generates CLI management information for aggressor UEs. This intermediary role allows the system to coordinate between UEs with different SCS configurations, resolving the reliability issue without sacrificing adaptability.
2Productivity
If CLI measurement signals are transmitted without SCS alignment, then transmission speed and resource utilization are improved, but measurement accuracy deteriorates due to mismatched subcarrier spacing
Solution Approach 1:
The patent modifies the SCS parameter by introducing a reference SCS that serves as a common baseline. This parameter change enables signals from UEs with different actual SCS configurations to be properly aligned and measured, achieving both efficient resource utilization and accurate measurement by decoupling the measurement reference from the actual transmission parameters.
3Productivity
If TDD configurations are optimized for different traffic patterns in neighboring cells, then communication throughput is improved, but cross-link interference increases due to overlapping transmission directions
Solution Approach 1:
The patent implements a feedback mechanism where victim UEs report CLI measurement results to their serving base stations, which then generate and transmit CLI management information to aggressor UEs. This feedback loop enables the system to detect and manage interference while maintaining optimized TDD configurations for high throughput.
Solution Approach 2:
The base station acts as an intermediary that receives throughput optimization requirements from different cells and coordinates TDD configurations to minimize overlapping transmissions. This intermediary coordination allows neighboring cells to maintain their own optimized traffic patterns while reducing mutual interference through base station-level management.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) served by a first cell and a second UE served by a second cell may experience cross link interference (CLI). The UEs may have different subcarrier spacing (SCS) configurations. For example, the uplink SCS of the aggressor UE may be different from the downlink SCS of the victim UE. The serving base stations may configure the UEs with one or more parameters for generating and measuring a signal used to manage the CLI. The parameters may be based on the uplink SCS of the aggressor and the downlink SCS of the victim. The aggressor UE may apply the parameters to generate the CLI measurement signal, and the victim UE may apply the parameters to measure the CLI measurement signal, so the signal from the transmitter fits into the resource grid of the receiver.