Link Adaptation Using Feedback Tables for Wireless Capacity
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Solution Overview
Problem
Conventional link adaptation methods in wireless communication systems fail to consider various parameters beyond packet length and coding, leading to inefficiencies in transmission capacity and power consumption, especially in asymmetrical link conditions.
Innovation Solution
A link adaptation method that utilizes feedback information to estimate signal-to-noise ratio (SNR) and adjust transmission rate and power by selecting between white noise and delay spread tables, optimizing modulation and power usage based on link margin calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional link adaptation methods are used, then packet length and coding method can be adjusted, but transmission capacity and power consumption cannot be optimized
Solution Approach 1:
The patent extends link adaptation by changing multiple parameters simultaneously including packet length, coding method, transmission power, and modulation method. The system dynamically adjusts these parameters based on feedback information about link conditions, allowing optimization of both transmission capacity and power consumption beyond what conventional methods achieve.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving station provides feedback information about link conditions to the transmitting station. This feedback loop enables continuous optimization of transmission parameters based on actual link performance, allowing the system to adapt to changing conditions and optimize both productivity and energy efficiency.
2Productivity
If transmission power is increased to improve transmission capacity, then data transmission delay increases
Solution Approach 1:
The patent makes transmission power dynamic by continuously adjusting it based on feedback information about link conditions. Rather than using fixed high power, the system adapts power levels in real-time to match actual channel conditions, achieving high transmission capacity when needed while minimizing power consumption and reducing transmission delay when conditions permit.
Solution Approach 2:
The patent changes transmission power as a dynamic parameter alongside packet length, coding method, and modulation method. By coordinating multiple parameter changes together, the system can achieve efficient transmission capacity without the penalties of excessive power consumption and transmission delay that would result from power alone.
3Productivity
If link adaptation is performed without considering asymmetrical link conditions, then transmission parameters can be simplified, but transmission capacity is reduced
Solution Approach 1:
The patent uses feedback information from the receiving station to automatically capture asymmetrical link conditions. The feedback mechanism provides the transmitting station with necessary information about actual link performance, allowing the system to adapt to asymmetry without requiring complex local monitoring or measurement at the transmitting end alone.
Solution Approach 2:
The feedback information acts as an intermediary that carries link condition data from the receiving station to the transmitting station. This intermediary mechanism allows the transmitting station to infer asymmetrical conditions and adjust parameters accordingly, bridging the information gap without requiring direct complex interaction or monitoring between the stations.
Data Source
AI summary
Disclosed is a link margin adaptation method using feedback information of a wireless communication system. For transmission and reception of data between two nodes of the wireless communication system, a transmission node requests a receiving node to transmit a link margin. The transmission node receives the link margin, and selects one of a white noise table or a delay spread table according to a delay spread value between the two nodes. Then, the transmission node adapts a link between the two nodes to a transmission mode and decides a transmission rate to transmit data at the decided transmission rate, thereby improving transmission capacity of the wireless communication system, obtaining the optimum link state, extending power utilization time of stations, and reducing interference between stations.