Dual SIM Device Interference Management in CBRS Networks
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Solution Overview
Problem
Citizens Broadband Radio Service (CBRS) networks face interference management challenges due to the limitations of current spectrum access systems using propagation and pathless models, which do not accurately represent real interference levels, leading to potential disconnections and rate restrictions for users.
Innovation Solution
Implementing dual Subscriber Identification Module (SIM) devices that assign physical cell identities (PCIs) to CBRS devices, allowing them to exchange PCI information and measure power values, which are then reported to a Spectrum Access System (SAS) to make more accurate interference management decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If propagation and pathless models are used for interference management, then interference levels can be estimated, but the estimation does not accurately represent real interference levels
Solution Approach 1:
The system uses user devices themselves to perform interference measurements and reporting. Selected user devices autonomously measure interference levels on assigned resource blocks and report results to the SAS, eliminating the need for complex external measurement infrastructure while achieving accurate real-world interference data.
Solution Approach 2:
The system implements a feedback loop where interference measurements from user devices are reported to the SAS, which then uses this real feedback data to make informed spectrum authorization and interference management decisions, continuously improving accuracy based on actual network conditions.
2Measurement precision
If more measurements and reporting are performed, then interference management accuracy improves, but network overhead and device power consumption increase
Solution Approach 1:
The system assigns different roles and measurement responsibilities to different user devices based on local conditions. Selected devices perform detailed interference measurements and reporting, while other devices operate normally, distributing the measurement burden locally rather than requiring all devices to consume additional power.
Solution Approach 2:
The system performs measurements only when necessary - selecting specific user devices under specific conditions to perform interference measurements on specific resource blocks, rather than continuous measurements by all devices. This partial action approach achieves sufficient measurement accuracy while minimizing overall network overhead and power consumption.
Data Source
AI summary
Methods and systems for citizens broadband radio service (CBRS) interference management using dual subscriber identification module (SIM) devices are described. The method includes assigning a physical cell identity (PCI) to each CBRS device (CBSD) granted unlicensed spectrum by a spectrum access system (SAS). Each spectrum granted CBSD may exchange PCIs with neighbor spectrum granted CBSDs to resolve PCIs and maintains a PCI table. A dual SIM device may be connected to a CBSD via a first SIM. Each spectrum granted CBSD having a connected dual SIM device reports a number of PCIs detected by the dual SIM device(s). A SAS designated dual SIM device may use a second SIM to measure power values of PCIs detected by the designated dual SIM device which are absent from a provided PCI table. The measured power values may be used by the SAS to make cluster interference decisions.