UAV Carrier Aggregation With Shared CBR for BVLOS Links
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Solution Overview
Problem
Unmanned aerial vehicles (UAVs) face challenges in managing radio resources for effective beyond visual line of sight (BVLOS) operations, requiring improved latency and reliability in command, control, and communications (C3) services, as well as efficient detect and avoid (DAA) functionalities.
Innovation Solution
WTRUs/UAVs exchange channel busy ratio (CBR) information and carrier aggregation capabilities to enhance carrier selection and reselection, with network assistance for optimized transmission and contention resolution, using position and intent broadcast services (PIBS) for coordinated resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If WTRUs perform individual CBR measurements for carrier selection, then measurement accuracy for monitored carriers is improved, but system complexity and time consumption increase due to multiple independent measurements
Solution Approach 1:
Multiple individual CBR measurements from different WTRUs are merged into a single aggregated CBR value. The network collects CBR reports from multiple UEs monitoring the same carrier and combines these measurements to generate one representative CBR value for carrier selection, reducing the complexity of managing multiple independent measurements while maintaining accuracy.
Solution Approach 2:
The network acts as an intermediary that collects CBR information from multiple WTRUs and processes it to generate aggregated CBR values. Instead of each WTRU independently performing complex measurements, the network mediates by collecting reports and computing aggregated statistics, thereby simplifying the overall system complexity.
2Measurement precision
If WTRUs continuously monitor all carriers for CBR information, then carrier selection accuracy is improved, but energy consumption and processing overhead increase
Solution Approach 1:
Instead of WTRUs continuously monitoring all carriers themselves, the network extracts and collects CBR information from WTRUs that are already monitoring carriers. The network then provides this aggregated information to WTRUs for carrier selection decisions, reducing the energy consumption of individual WTRUs while maintaining comprehensive carrier awareness.
Solution Approach 2:
The network collects CBR reports from WTRUs and feeds back aggregated CBR information to them. This feedback mechanism allows WTRUs to make informed carrier selection decisions without continuously performing their own measurements across all carriers, thereby reducing energy consumption while maintaining accurate carrier usage awareness.
3Measurement precision
If network aggregates CBR statistics from multiple WTRUs, then carrier selection accuracy for all carriers is improved, but network processing complexity and signaling overhead increase
Solution Approach 1:
The network performs preliminary actions by collecting CBR reports from WTRUs in advance and pre-computing aggregated CBR values. This allows the network to prepare carrier selection information ahead of time, reducing the complexity of real-time processing while maintaining accurate aggregated statistics for carrier selection.
Data Source
AI summary
Wireless transmit/receive units (WTRUs) may include unmanned aerial vehicles (UAVs). The WTRUs/UAVs may cooperate to exchange channel busy ratio (CBR) and/or CBR statistics of one or more (e.g., all) the carriers that the WTRUs/UAVs monitors with each other for carrier selection/carrier reselection. A network may provide one or more inputs on carrier selection. For example, a network may provide one or more inputs on carrier selection based on the congestion that the network infers (e.g., through the CBR measurements reported by the WTRUs/UAVs and/or through its own measurements). MAC/PHY layers may be configured to perform transmit adaptation during PDCP packet duplication. For example, the carrier aggregation capability of receivers may be considered to adapt the number of transmissions per carrier. Based on the carrier aggregation capability of the receivers, the number of transmissions at one or more (e.g., every) carriers may be optimized jointly across carriers.