TCP ACK Packet Merging in WiMAX MAC PDUs
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Solution Overview
Problem
In mobile WiMAX networks, the transmission of TCP ACK packets is inefficient due to high loss and delay, which affects data transmission performance, especially when shared buffers cause ACK compression, leading to reduced throughput and increased re-transmissions.
Innovation Solution
A method that unifies TCP ACK packets with data packets in the same queue, creating a MAC PDU for transmission, and includes a device with a packet unifying unit to extract and restore TCP ACK information, allowing efficient transmission and reception of TCP ACK packets, thereby reducing delay and loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TCP ACK packets are transmitted separately from data packets, then the transmission of ACK packets is simple, but the transmission efficiency is reduced and throughput is lowered
Solution Approach 1:
The patent merges TCP ACK packets with data packets into a single MAC PDU transmission. The ACK packet is combined with the data packet payload, allowing both to be transmitted together over the wireless link. This eliminates separate ACK transmission, reduces overhead, and improves transmission efficiency while maintaining the simplicity of the MAC layer processing.
2Quantity of substance
If buffer sharing is implemented for data and TCP ACK packets, then resource utilization is improved, but ACK compression occurs causing transmission delay
Solution Approach 1:
The patent segments the packet transmission process into two distinct paths: data packets are transmitted as normal payloads, while ACK packets are handled separately by being combined with the next data packet transmission. This segmentation prevents ACK compression by ensuring ACK packets are not queued with data packets in the same buffer, thereby eliminating transmission delay while maintaining efficient resource utilization.
3Reliability
If high transmission frequency of TCP ACK packets is used, then acknowledgment reliability is improved, but throughput efficiency of payload data transmission is reduced
Solution Approach 1:
The patent combines ACK packets with data packets into unified MAC PDUs, allowing ACK transmission to occur simultaneously with data transmission rather than as separate frequent cycles. This merging approach maintains ACK delivery reliability while eliminating the throughput penalty associated with high-frequency separate ACK transmissions, as the wireless channel is utilized more efficiently.
4Loss of time
If separate service flows are created for uplink and downlink traffic, then TCP ACK compression is prevented, but device complexity and resource consumption increase
Solution Approach 1:
The patent extracts the ACK packet handling logic from the general data packet processing flow. By separating ACK packet identification and processing, the system can handle ACK packets specially by combining them with data packets, without requiring complex separate service flow configurations. This extraction approach prevents ACK compression while maintaining simple service flow management.
Data Source
AI summary
Disclosed is a broadband wireless network, and more particularly, to a method for transmitting and receiving a TCP ACK packet, and a device supporting the same, wherein the method for transmitting and receiving a TCP ACK packet receiving TCP ACK packets and data packets from an upper layer; creating a MAC PDU by unifying the TCP ACK packet and data packet buffered in the same queue among the received TCP ACK packets and data packets; and transmitting the MAC PDU to a physical layer.