Virtual PCI Reference Signaling for Satellite Uplink Interference
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Solution Overview
Problem
In satellite communication systems, the frequent movement of satellites causes PCI modulo conflicts, leading to DMRS interference and a significant burden on PCI management, which conventional terrestrial methods cannot effectively address.
Innovation Solution
A communication method that utilizes virtual PCIs and sequence group parameters to adjust reference signals, avoiding modulo conflicts and reducing uplink interference by changing sequence groups and resource positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PCI is bound to satellite for non-terrestrial network communication, then PCI management burden increases significantly due to frequent movement and coverage area changes, but if conventional terrestrial PCI binding methods are used, then PCI modulo conflicts occur between different cells
Solution Approach 1:
The patent introduces a virtual PCI as an intermediary between the physical cell identifier and the reference signal generation. The virtual PCI is calculated based on the physical PCI and additional parameters (such as orbital parameters, time, or frequency) to create a unique identifier that avoids modulo conflicts while maintaining the benefits of PCI binding to mobile satellites. This intermediary layer resolves the conflict between using limited PCI values and avoiding interference.
Solution Approach 2:
The patent changes the parameters used for reference signal generation by introducing virtual PCI calculation that incorporates additional variables beyond the physical PCI. By modifying the parameter set (adding orbital elements, time stamps, or frequency information to the PCI calculation), the system generates unique virtual PCIs that prevent modulo conflicts while adapting to satellite movement.
2Object-affected harmful factors
If PCI modulo conflict occurs between different cells, then reference signals become identical causing uplink interference, but if different PCIs are used, then resource utilization efficiency decreases
Solution Approach 1:
The patent segments the PCI space by creating virtual PCIs that are derived from physical PCIs through additional calculations. This segmentation allows the same physical PCI to generate different virtual PCIs based on contextual parameters (orbital position, time, frequency), effectively dividing the limited PCI space into multiple usable segments that prevent conflicts while maintaining resource efficiency.
Solution Approach 2:
The patent adds another dimension to PCI identification by incorporating additional parameters (such as orbital elements, time, or frequency) into the virtual PCI calculation. This dimensional expansion transforms the one-dimensional physical PCI into a multi-dimensional virtual PCI, providing sufficient uniqueness without requiring an increase in the base PCI value range.
Data Source
AI summary
A communication method and apparatus are provided, to reduce uplink signal interference caused by a PCI modulo conflict, thereby improving communication performance. The method includes: A second device sends first information, where the first information is used to obtain a virtual PCI of a first cell, and the virtual PCI is different from a PCI of the first cell; a first device receives the first information from the second device; the first device obtains the virtual PCI of the first cell based on the first information; the first device sends a first reference signal based on the virtual PCI; and the second device receives the first reference signal from the first device.