SRS-Based Crosslink Interference Measurement in NTN Spectrum Sharing
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Solution Overview
Problem
In wireless communications systems, devices operating in terrestrial and non-terrestrial networks face challenges in measuring crosslink interference due to differences in propagation delays, subcarrier spacing, and frequency precompensation, leading to difficulties in receiving sounding reference signals (SRS) from devices in the other network type.
Innovation Solution
A receiving device receives multiple instances of SRS across consecutive symbols, applying a cyclic shift and cyclic prefix, allowing for interference measurement and reporting, while transmitting devices use a periodic transmission pattern to facilitate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices in terrestrial and non-terrestrial networks operate simultaneously using the same spectrum, then spectrum utilization efficiency is improved, but crosslink interference measurement becomes difficult due to propagation delay and frequency precompensation differences
Solution Approach 1:
The patent segments the interference measurement process into distinct phases: receiving SRS signals from both terrestrial and non-terrestrial devices in different time slots, separately processing measurements for each network type, and then aggregating results. This segmentation allows the system to handle propagation delay and frequency precompensation differences by treating each network type's interference measurement independently before combining results, thus maintaining measurement reliability while enabling spectrum sharing.
2Adaptability or versatility
If sounding reference signals are transmitted with different propagation delays and frequency precompensation, then non-terrestrial network communication is enabled, but synchronization for receiving SRS becomes problematic
Solution Approach 1:
The patent applies preliminary actions by pre-configuring different time slot allocations and frequency precompensation values for terrestrial and non-terrestrial SRS transmissions. The system预先 establishes synchronization parameters and reception windows that account for the known propagation delay differences, allowing receiving devices to properly synchronize and process SRS signals from both network types without interference from the delay and frequency variations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some examples, a first UE may receive multiple instances of an SRS from a second UE via consecutive symbols. The second UE may apply a cyclic shift and may add a cyclic prefix to each instance of the SRS such that the second UE periodically transmits the SRS across the symbols. The first UE may monitor the symbols during an observation window to receive a portion of a first instance of the SRS and a portion of a second instance of the SRS. In some examples, the combination of the portion of the first instance of the SRS and the portion of the second instance of the SRS may comprise a full period of an instance of the SRS. Accordingly, the first UE may measure interference using the SRS and transmit a report indicating interference information.