Adaptive Linearity Front Ends for OFDMA Latency Reduction
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Solution Overview
Problem
In orthogonal frequency-division multiple access (OFDMA) systems, existing technologies face challenges in optimizing data transmission rates and reducing latency by efficiently managing linearity operating points across different groups of user devices, particularly due to varying distances from the access point, which affects power consumption and modulation coding schemes.
Innovation Solution
The method involves grouping user devices based on their proximity to the access point and assigning different linearity operating points to these groups, allowing for adaptive front-end adjustments, such as changing operating voltage, to optimize data transmission rates and reduce latency by using higher modulation coding schemes for farther devices and conserving power for closer devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single linearity operating point is used for all user devices, then device complexity is reduced, but data transmission rates cannot be optimized for different distance groups and latency increases
Solution Approach 1:
The patent segments user devices into different groups based on their distance from the access point (near devices, far devices). Each group is assigned a specific linearity operating point, allowing optimized data transmission rates for each segment while managing front end complexity through systematic grouping and resource unit allocation.
Solution Approach 2:
The patent implements dynamic linearity adjustment by switching between different linearity operating points (first linearity operating point for near devices, second linearity operating point for far devices) based on the target user group. This dynamic adaptation enables optimized transmission rates without permanent complexity increase, as the system adapts its configuration based on real-time transmission needs.
2Productivity
If higher linearity operating points are used for all devices, then data transmission rates improve, but power consumption increases
Solution Approach 1:
The patent applies local quality by assigning different linearity operating points to different spatial groups of devices. Near devices receive transmissions with a first linearity operating point (lower power), while far devices receive transmissions with a second linearity operating point (higher power). This localized optimization ensures power is consumed only when and where higher transmission rates are actually needed.
Solution Approach 2:
The patent changes the linearity operating point parameter based on the distance group of the target devices. By adjusting this key parameter dynamically according to spatial location, the system achieves optimized data transmission rates only for devices that require them, thereby reducing overall power consumption compared to using a consistently high linearity setting.
3Loss of time
If user groups are not combined, then transmission precision for individual groups is maintained, but the number of transmissions increases and latency increases
Solution Approach 1:
The patent merges multiple user groups into combined resource units that can be transmitted together in a single PPDU. By combining near and far device groups into unified transmission resources, the system reduces the total number of separate transmissions required, thereby reducing latency without sacrificing transmission precision, as the combined resources maintain appropriate linearity settings for each device type.
Solution Approach 2:
The system performs self-service by automatically grouping devices and allocating combined resources based on their distance characteristics. The access point autonomously determines which near and far devices can be combined in the same transmission, managing the complexity of precision maintenance while achieving latency reduction through intelligent resource consolidation.
Data Source
AI summary
Embodiments herein describe assigning different linearity operating points of a front end of a radio to groups of user devices when transmitting data using OFDMA. That is, when transmitting a PPDU to a first group of user devices, an access point (AP) may set the front end of the radio to a lower linearity operating point than when transmitting a PPDU to a second group of user devices. Using a higher linearity operating point can increase the data rate used to transmit the PPDU—e.g., the AP can use a higher modulation coding scheme (MCS). This can reduce the time the PPDUs have to wait in a queue before being transmitted.