Adaptive Retransmission Control for Wireless Communication Throughput
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Solution Overview
Problem
In wireless communication systems, conventional retransmission control methods, such as HARQ, suffer from significant retransmission delays due to the long Round Trip Time (RTT) in wireless environments, leading to degraded system throughput, especially when implementing TCP protocol for high-speed and large-capacity data transmission.
Innovation Solution
A transmitting apparatus and method that allows for immediate retransmission of communication data without waiting for an acknowledgement signal or a predetermined RTT, using a retransmission wait time controlled by a predicting unit based on data attributes, wireless resource availability, and past communication data patterns to reduce retransmission delay and increase data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HARQ retransmission control is used with predetermined RTT waiting, then reliability of error compensation is improved, but retransmission delay increases and system throughput deteriorates
Solution Approach 1:
The patent applies dynamics by making the retransmission control adaptive rather than static. The transmitting apparatus dynamically adjusts retransmission timing based on real-time feedback about packet loss conditions, changing from a fixed RTT waiting approach to a flexible response mechanism that reacts to actual error conditions in the wireless channel.
Solution Approach 2:
The patent implements feedback by using packet loss detection information to control retransmission timing. The system continuously monitors for packet losses and uses this feedback to trigger immediate retransmissions when needed, rather than waiting for predetermined RTT periods to elapse.
2Productivity
If immediate retransmission is performed without waiting for RTT, then retransmission delay is reduced and throughput is improved, but unnecessary retransmissions may occur increasing system complexity
Solution Approach 1:
The patent applies preliminary action by proactively detecting packet losses and preparing for immediate retransmission before the predetermined RTT period would naturally expire. This allows the system to jump ahead in the retransmission timeline when packet loss is detected, improving throughput without requiring complex real-time decision-making during the RTT window.
3Quantity of substance
If TCP protocol is implemented in wireless network for high-speed data transmission, then large-capacity communication capability is improved, but packet loss sensitivity increases causing throughput degradation
Solution Approach 1:
The patent converts the harmful effect of packet loss (which normally triggers TCP congestion control and reduces throughput) into a beneficial trigger for immediate retransmission. By detecting packet losses and using them to initiate rapid retransmission cycles, the system turns what would be a throughput-degrading event into an opportunity to maintain high data flow rates.
Data Source
AI summary
A wireless communication system in which retransmission is performed between a transmitting apparatus and a receiving apparatus, whereby the transmitting apparatus includes, a first transmitting unit to transmit first data to the receiving apparatus and retransmission controlling unit to perform transmission of second data, the data part of which is same as that of the first data, without waiting for a feedback signal from receiving apparatus regarding the first data, and to wait for a feedback signal from the receiving apparatus regarding the second data, and the receiving apparatus includes, a second transmitting unit to transmit the feedback signal regarding the second data to the transmitting apparatus.