Dynamic Inter Band Carrier Aggregation for Wireless Devices
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Solution Overview
Problem
Wireless networks face inefficiencies due to underutilization of higher-order modulation schemes, leading to wasted resources and low spectral efficiency, as these schemes are rarely invoked due to susceptibility to errors and the need for high signal-to-interference-plus-noise-ratio (SINR) conditions, which are typically met only close to the access node.
Innovation Solution
Implementing dynamic inter band carrier aggregation, where the access node determines the location of wireless devices and compares it with predetermined map data to identify overlapping coverage areas between different frequency bands, allowing devices to switch to higher-order modulation schemes on lower frequency bands when spectral efficiency thresholds are met, thereby increasing data transmission rates and overall network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher-order modulation schemes are used to increase data transmission rate, then spectral efficiency is improved, but reliability deteriorates due to susceptibility to errors and packet loss
Solution Approach 1:
The system dynamically changes modulation scheme parameters (order of modulation) based on channel conditions and device location. By adjusting the modulation order from QPSK to higher-order QAM schemes, the system optimizes the trade-off between data transmission rate and reliability, invoking higher-order schemes only when SINR conditions are satisfied.
2Reliability
If higher-order modulation schemes are invoked only when SINR threshold is met, then reliability is maintained, but spectral efficiency deteriorates due to underutilization of higher-order schemes
Solution Approach 1:
The system implements dynamic carrier aggregation that adapts to changing channel conditions and device locations. By dynamically activating carrier aggregation when devices enter overlapping coverage areas and deactivating when they leave, the system maximizes spectral efficiency while maintaining reliability through conditional invocation of higher-order modulation schemes.
Solution Approach 2:
The system uses a single lower frequency band to serve multiple functions: providing coverage extension and enabling higher-order modulation schemes. This multi-functional approach allows the lower band to both extend coverage to distant devices and provide high-rate data transmission through higher-order QAM when devices are in overlapping coverage areas.
3Productivity
If carrier aggregation is performed to increase bandwidth, then data transmission rate is improved, but device complexity increases
Solution Approach 1:
The system implements partial carrier aggregation by aggregating only when devices are located in overlapping coverage areas and higher-order modulation is beneficial. This selective approach avoids the complexity of continuous multi-carrier operation while capturing the performance benefits when conditions are favorable.
Data Source
AI summary
A system for inter band carrier aggregation includes an access node configured to deploy a radio air interface to provide wireless services to a plurality of wireless devices. The access node includes a processor configured to determine a location of a wireless device. The processor is also configured to compare the location of the wireless device with predetermined map data to determine whether the wireless device is located within an overlapping area between a first coverage area of a first modulation scheme on a first frequency band and a second coverage area of a second modulation scheme on a second frequency band. The processor is further configured to, when the wireless device is located within the overlapping area, perform an inter band carrier aggregation between the first frequency band and the second frequency band for the wireless device.