Cellular Random Access Control for High-Altitude UAV Interference
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Solution Overview
Problem
Existing communication systems face interference issues during random access procedures for unmanned aerial vehicles (UAVs) operating at high altitudes, which affect ground-based user equipment due to the wider signal reach and overlapping frequency usage.
Innovation Solution
Implementing dedicated parameters for the random access procedure specific to UAVs operating at altitudes equal to or higher than a predetermined threshold, such as adjusted transmission power, retransmission counts, and backoff times, to minimize interference with ground-based user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If UAVs use standard random access parameters for communication, then communication establishment is simplified, but interference with ground-based user equipment increases due to wider signal reach at high altitudes
Solution Approach 1:
The patent applies local quality by implementing altitude-specific random access parameters. Different parameter sets are configured based on the UE's altitude: standard parameters for ground-based devices and specialized parameters for aerial devices. This allows the system to optimize performance and minimize interference by tailoring communication characteristics to the specific operational environment of each UE type.
Solution Approach 2:
The patent implements parameter changes by modifying random access procedure parameters based on altitude. Key parameters such as preamble transmission power, root sequence index, and cyclic shift are adjusted for aerial UEs compared to ground-based UEs. These parameter modifications enable UAVs to perform random access while reducing their signal footprint and minimizing interference to ground equipment.
2Device complexity
If UAVs transmit with standard power levels during random access, then transmission simplicity is maintained, but signal interference with ground equipment increases due to high altitude signal propagation
Solution Approach 1:
The patent applies parameter changes by introducing altitude-dependent transmission power control for random access preambles. Aerial UEs are configured with specific power levels that account for their elevated position and reduced path loss compared to ground devices. This prevents excessive signal strength that would otherwise cause interference with ground-based equipment while maintaining adequate signal quality for successful access.
Solution Approach 2:
The patent implements local quality by creating distinct transmission configurations for aerial and ground UEs. The network node identifies aerial UEs (through altitude reporting or dedicated configurations) and applies localized transmission parameter sets that are optimized for their specific operational context, thereby reducing their harmful electromagnetic impact on ground infrastructure.
3Object-affected harmful factors
If dedicated parameters are implemented for aerial UEs, then interference with ground equipment is reduced, but system complexity increases due to multiple parameter sets
Solution Approach 1:
The patent applies segmentation by dividing the random access parameter space into distinct sets: standard parameters for ground-based UEs and dedicated aerial parameters for UAVs. The network node maintains these separate parameter sets and selectively applies them based on UE type identification. This segmentation allows interference mitigation while organizing complexity in a manageable, structured manner.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of altitude-based UE identification and parameter selection logic. The network node acts as an intermediary that receives altitude information from UEs, determines the appropriate parameter set, and configures the corresponding random access parameters. This intermediary layer manages the complexity of multiple parameter sets through automated, rule-based selection rather than manual configuration.
Data Source
AI summary
In an aspect, a communication control method is used in a cellular communication system. The communication control method includes a step of transmitting, by a network node, a parameter used in a random access procedure to a user equipment. The parameter is a parameter dedicated to the user equipment located at an altitude equal to or higher than a predetermined threshold value.