A network congestion control method and system based on TCP message payload truncation

By truncating TCP packet payloads and encoding length information in data center networks, the problems of congestion feedback delay and insufficient retransmission accuracy are solved, enabling rapid congestion recovery and efficient bandwidth utilization, thereby improving the performance and resource utilization efficiency of data center networks.

CN122179372APending Publication Date: 2026-06-09YUNHE ZHIWANG (SHANGHAI) TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610195125.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-11
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing data center network congestion control technologies suffer from high congestion feedback latency, insufficient retransmission accuracy, passive response mechanisms, and high deployment complexity, which affect network performance and resource utilization efficiency.

Method used

When network devices detect impending congestion, they truncate the payload of TCP packets, retaining only the IP header and TCP header, and use the fields in the IP header to encode the total length information of the original TCP packet before sending a Cut packet to achieve fast congestion recovery.

Benefits of technology

It achieves extremely low congestion feedback latency, accurate data retransmission, good compatibility, and efficient bandwidth utilization, avoiding buffer overflows and invalid data transmission, and improving network performance and resource utilization efficiency.

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Abstract

This invention discloses a network congestion control method and system based on TCP packet payload truncation. The method includes: a sending end sending an original TCP packet to a network device; when the network device detects impending congestion, it truncates the payload, retaining only the IP header and TCP header, setting a pre-defined bit in the first field to a truncation flag, and encoding the total length information of the original TCP packet; the network device modifies the Total Length field of the IP header of the TCP packet to the current actual length, calculates and updates the IP checksum, keeps the TCP header and its checksum unchanged, obtains a Cut packet, and sends it to the receiving end; after receiving the TCP packet, the receiving end, when checking that the pre-defined bit in the first field is a truncation flag, ignores TCP checksum errors, extracts the total length information of the original TCP packet, and constructs an ACK acknowledgment packet based on the total length information; after receiving the ACK acknowledgment packet, the sending end retransmits data of the corresponding length according to the total length information. This invention enables rapid congestion recovery of TCP packets.
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