Communication Apparatus Data Flow Control for Buffer Overflow Prevention
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Solution Overview
Problem
In wireless communication systems using unlicensed bands, rapid deterioration in radio quality and increased device connections lead to buffer overflows in both transmission and reception buffers, causing decreased transmission efficiency and communication characteristics, as existing flow control methods primarily address reception buffer overflow without considering transmission buffer issues.
Innovation Solution
A communication apparatus and method that estimates the amount of transmittable data using radio wave and communication indices, allowing for controlled data flow management through the MAC layer, preventing buffer overflows and optimizing band usage by temporarily accumulating data and adjusting transmission rates based on estimated available bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unlicensed band is used for wireless communication to reduce connection cost, then connection cost is reduced, but radio quality deteriorates rapidly due to interference and noise from different devices
Solution Approach 1:
The patent applies preliminary action by estimating the amount of transmittable data in advance based on radio wave indexes and communication indexes before data transmission. This allows the system to proactively adjust data flow to match actual transmission capacity, preventing buffer overflows and maintaining reliable communication in the unlicensed band environment.
2Reliability
If flow control is performed to avoid reception buffer overflow, then reception buffer overflow is prevented, but transmission buffer overflow is not addressed
Solution Approach 1:
The patent implements feedback by continuously monitoring radio wave indexes and communication indexes, estimating the amount of transmittable data based on this feedback, and adjusting the data flow control accordingly. This closed-loop approach enables comprehensive prevention of both transmission and reception buffer overflows by adapting to real-time channel conditions.
3Quantity of substance
If upper-layer protocol transmits large amount of data to wireless transmission unit, then data transmission volume is increased, but buffer overflow occurs when radio quality deteriorates rapidly
Solution Approach 1:
The patent applies dynamics by making the data flow control adaptive and dynamic rather than static. The system continuously estimates the amount of transmittable data based on current radio wave and communication indexes, allowing the data transmission rate to dynamically adjust to changing channel conditions, thus preventing buffer overflow while maximizing data transmission volume.
4Reliability
If retransmission is performed frequently in MAC layer due to rapid environmental changes, then error correction is improved, but transmission efficiency is greatly decreased
Solution Approach 1:
The patent applies preliminary anti-action by taking preventive measures before transmission errors occur. By estimating the amount of transmittable data in advance based on radio wave and communication indexes, the system adjusts the data flow to match actual transmission capacity, preventing the need for frequent retransmissions and maintaining high transmission efficiency while ensuring reliable delivery.
Data Source
AI summary
A communication apparatus includes an accumulation means 501 that temporarily accumulates communication data in a previous stage of transmission to the MAC layer, an estimation means 502 that estimates an amount of transmittable data, which is an amount of data that can be transmitted in the MAC layer in a predetermined period, by using a radio wave index that is an index related to a radio wave in the frequency and/or a communication index that is an index related to wireless communication using the frequency, the indices being measured by an own apparatus or a wireless device including a MAC layer used by the own apparatus, and a control means 503 that controls, on the basis of an estimation result of the amount of transmittable data, a data flow of when the communication data accumulated in the accumulation means 501 is transmitted to a lower layer.