Network-Controlled Repeater CIRS for Cross-Cell Interference Mitigation
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Solution Overview
Problem
Wireless communication systems face interference issues due to network-controlled repeaters extending cell footprints beyond planned boundaries, causing unintended interference with neighboring cells.
Innovation Solution
Implementing a communication indication reference signal (CIRS) to alert victim cells of upcoming interference, allowing devices to take adaptive actions such as avoiding scheduling overlaps or reporting interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wireless repeaters are deployed to extend cell footprint, then coverage area is improved, but interference with neighboring cells increases
Solution Approach 1:
The system transmits CIRS signals before actual data transmissions to provide advance warning of upcoming interference. Victim cells can then take preliminary actions such as adjusting scheduling or applying interference mitigation techniques before the interfering transmission occurs, thereby reducing the harmful impact while maintaining the extended coverage benefit
Solution Approach 2:
The interference management system implements a feedback mechanism where victim cells measure interference from CIRS signals and report back to aggressor cells. This feedback loop enables dynamic adjustment of transmission parameters to balance coverage extension with interference control, resolving the contradiction between expanding cell footprint and minimizing interference
2Reliability
If CIRS signals are transmitted to warn victim cells, then interference mitigation capability is improved, but network complexity increases
Solution Approach 1:
The CIRS signal acts as an intermediary mechanism that carries interference warning information between aggressor and victim cells without requiring direct complex coordination protocols. This intermediary approach simplifies the overall system by providing a standardized warning signal that can be processed through existing measurement and reporting mechanisms
Solution Approach 2:
The CIRS framework is designed to work across multiple radio access technologies and cell configurations, providing a universal interference warning mechanism. By making the interference mitigation capability multi-functional and broadly applicable, the system achieves high reliability without proportionally increasing complexity
3Adaptability or versatility
If dynamic interference management is implemented, then network flexibility is improved, but measurement and detection difficulty increases
Solution Approach 1:
The system uses CIRS signals as simplified copies or representations of actual interfering transmissions. These reference signals replicate the key characteristics of potential interference in a measurable and controllable form, enabling victim cells to assess interference conditions without needing to detect and analyze complex actual interfering signals
Data Source
AI summary
Various aspects of the present disclosure relate to a first cell that configures a communication indication reference signal (CIRS) associated with one or more communication elements (e.g., time-frequency resources, spatial relations, channels and signals, and so forth). When a communication is going to be transmitted with the one or more communication elements in the first cell, the base station in the first cell transmits the CIRS to indicate to one or more other cells that there is an upcoming associated communication. Then, devices in the one or more other cells (e.g., base station, user equipment, network-controlled repeater) may measure the interference and determine whether and how much interference to expect on the associated communication elements in the upcoming associated communication.