UAV Underlay Broadcast Channel for Interference Management
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Solution Overview
Problem
Integration of unmanned aerial vehicles (UAVs) into terrestrial wireless cellular networks poses challenges due to uplink signal interference and inefficient resource allocation, particularly in high-traffic scenarios, as conventional semi-persistence scheduling techniques are inadequate for managing interference across multiple cells.
Innovation Solution
Implementing an underlay broadcast channel with a spread spectrum technique for UAVs to communicate their uplink transmission information to neighboring base stations, allowing grant-free transmission and minimizing interference by using a cyclic prefix direct sequence spread spectrum (CP-DSSS) modulation, which enables efficient resource management and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If orthogonal resources are assigned for UAV transmissions to handle interference, then interference between UAV and terrestrial UEs is reduced, but resource utilization efficiency deteriorates because multiple cells cannot use the resources for their own served UEs
Solution Approach 1:
The patent segments the communication resources by creating a dedicated underlay broadcast channel separate from the main data transmission channel. This allows scheduling information to be transmitted on a distinct resource layer, enabling other cells to utilize the original resources for their UEs while the serving cell receives UAV scheduling info without resource conflict.
Solution Approach 2:
The underlay broadcast channel acts as an intermediary mechanism that carries scheduling information from the serving base station to neighboring base stations. This mediator enables coordination and interference management without requiring direct resource sharing or complex multi-cell coordination protocols, thus maintaining high resource utilization efficiency.
2Object-affected harmful factors
If network coordination among base stations is implemented to manage UAV interference, then interference management improves, but system complexity increases due to real-time information exchange requirements between base stations
Solution Approach 1:
The underlay broadcast channel serves as a simplified intermediary that transmits only essential scheduling information (resource allocation, time slots, frequency bands) without requiring full coordination protocols. This reduces the complexity of inter-base station communication while still enabling effective interference management through informed resource scheduling at neighboring cells.
Solution Approach 2:
The patent extracts only the critical scheduling information from the complete coordination data and transmits it through the underlay broadcast channel. By taking out only the necessary elements (resource allocation details) rather than exchanging complete coordination datasets, the system achieves interference management with reduced communication overhead and lower system complexity.
3Device complexity
If semi-persistence scheduling is used for UAV-UE UL transmissions, then network coordination requirement is avoided, but performance deteriorates in high-traffic scenarios compared to low-traffic scenarios
Solution Approach 1:
The underlay broadcast channel enables preliminary action by providing neighboring base stations with advance scheduling information about UAV transmissions. This allows them to proactively plan their resource allocation and avoid conflicts before high-traffic scenarios occur, thereby maintaining performance in high-traffic conditions without requiring complex real-time coordination mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces interference by allowing neighboring base stations to schedule terrestrial UEs and UAVs optimally, improving network performance even in high-traffic conditions by using the underlay broadcast channel to share scheduling information and manage resource allocation dynamically.
Implementation Method 1
an underlay broadcast channel with a spread spectrum technique for UAVs to communicate their uplink transmission information to neighboring base stations
Implementation Method 2
which enables efficient resource management and interference reduction
Data Source
AI summary
An unmanned aerial vehicle (UAV) and base station are disclosed that communicate within a first cell via schedule requests to set up transmission of up-link data. The UAV additionally communicates up-link data via a grant-free underlay broadcast channel to one or more neighboring base stations of the terrestrial cellular network. Transmitters, receivers, related methods are also disclosed for modulation and demodulation of the transmission packets.