TDD Burst Size and Modulation Threshold Adaptation
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Solution Overview
Problem
Conventional wireless broadband communication systems using time division duplex (TDD) techniques suffer from high latency, which limits data throughput, especially in long-range applications with multiple point-to-point hops and high bandwidth requirements.
Innovation Solution
The system adjusts the size of transmit bursts based on the number of filler packets in previously received bursts and adjusts modulation threshold levels to optimize data throughput while maintaining acceptable packet error rates, employing time division duplex (TDD) techniques and adaptive modulation in a wireless broadband communication system with multiple transceivers and antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If time division duplex (TDD) techniques are used for transmitting and receiving wireless signals, then the system can operate in long range point-to-point and point-to-multipoint applications, but high latency occurs which limits data throughput
Solution Approach 1:
The patent applies dynamics by making the transmit burst size adjustable rather than fixed. The system dynamically adapts the burst size based on real-time channel conditions and packet error rates, allowing optimization of the trade-off between throughput and latency. By varying burst sizes from 10 to 40 OFDM symbols according to channel quality, the system can reduce latency when conditions permit while maintaining throughput when necessary.
Solution Approach 2:
The patent changes the parameter of transmit burst size to resolve the contradiction. By adjusting burst size as a variable parameter based on packet error rate feedback, the system optimizes both throughput and latency. The burst size is modified from fixed to dynamic, allowing the system to adapt to changing channel conditions and achieve better performance in long-range applications.
2Productivity
If the transmit burst size is increased to improve data throughput, then more data can be transmitted in less time, but packet error rates increase due to longer transmission duration
Solution Approach 1:
The patent implements feedback by monitoring packet error rates and using this information to adjust transmit burst sizes. The receiver sends feedback about packet error rates to the transmitter, which then modifies burst size accordingly. This closed-loop control allows the system to increase burst size for higher throughput when error rates are low, while reducing burst size when errors increase, thus optimizing both throughput and reliability.
Solution Approach 2:
The system makes burst size dynamic rather than static, adjusting it in real-time based on channel conditions. This dynamic adaptation allows the system to maximize throughput when channels are good while protecting against errors when channels deteriorate, resolving the contradiction between transmitting more data and maintaining packet integrity.
3Productivity
If adaptive modulation is used to adjust modulation threshold levels, then data throughput can be optimized, but system complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting modulation threshold levels as a variable parameter to optimize throughput. The system modifies modulation parameters based on channel conditions and packet error rates, allowing adaptive optimization of data transmission efficiency. This parameter adjustment approach enables the system to achieve higher throughput while keeping the complexity manageable through structured adaptation.
Data Source
AI summary
A wireless broadband communication system that operates with high efficiency and reduced latency in long range point-to-point and point-to-multipoint applications. The system includes multiple transceivers and multiple antennas for transmitting and receiving wireless signals using TDD techniques over multiple channels, which include a control channel for setting both the size of the transmit bursts and the modulation threshold level. By determining the size of the transmit bursts for a subsequent data transmission based upon the number of filler packets detected in a specified number of previously received bursts, and adjusting the modulation threshold level for the subsequent transmission based upon the transmit burst size, the system provides increased data throughput, while maintaining the packet error rate at an acceptable level. As the throughput requirements of the system are relaxed, the modulation threshold levels can be adjusted to provide reduced packet error rates.