Relay Apparatus ACK Timing Control for TDD Dead Time
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Solution Overview
Problem
In the congestion window control scheme, particularly when the reception-side communication apparatus uses a time division duplex (TDD) scheme, a dead time occurs where data is not transmitted despite being able to transmit, due to the stopping of congestion window growth.
Innovation Solution
A relay apparatus and method that includes a communication unit for transmitting downlink packets and ACK packets between communication apparatuses, and a transmission timing control unit that controls the transmission timing of ACK packets to be sent at specific intervals, thereby reducing dead time in the transmission-side communication apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission-side communication apparatus uses congestion window control to avoid network congestion, then network congestion is avoided, but dead time occurs where data transmission stops despite being able to transmit
Solution Approach 1:
The relay apparatus acts as an intermediary between the transmission-side and reception-side communication apparatuses. It receives ACK packets from the reception-side apparatus and proactively transmits them to the transmission-side apparatus without waiting for the normal ACK transmission cycle. This intermediary action ensures the transmission-side apparatus receives timely ACK information to maintain continuous data transmission, eliminating dead time while preserving congestion avoidance benefits
Solution Approach 2:
The relay apparatus performs preliminary action by receiving and holding ACK packets from the reception-side apparatus before the transmission-side apparatus would normally expect them. By preparing these ACK packets in advance and transmitting them proactively during periods when the transmission-side apparatus would otherwise be idle, the relay eliminates dead time before it occurs, allowing continuous data transmission
Data Source
AI summary
A relay apparatus (100) according to the present disclosure includes: a communication unit (101) that transmits a downlink packet received from a transmission-side communication apparatus (200) via a network to a reception-side communication apparatus (300) via the network, and transmits an ACK packet for the downlink packet received from the reception-side communication apparatus (300) via the network to the transmission-side communication apparatus (200) via the network; and a transmission timing control unit (102) that controls transmission timing of the ACK packet by the communication unit (101) so as to transmit the received ACK packet at a specific interval.