Transmission layer control method oriented to data packet deadline

Abstract

The invention discloses a transmission layer control method oriented to data packet deadline. The active packet loss and admission control are performed at a sending end transmission layer, and the data capable of arriving overtime is not sent; the transmission layer places the data packets with different priorities and issued by an application layer in different sending queues, and a forward error correction redundancy packet is generated according to the network packet loss rate and packet arrival time requirement, and the data packet which cannot arrive before the deadline is abandoned, andthen a scheduler computes the number of the data packet capable of arriving before the deadline according to the bandwidth, the delay and the packet arrival time requirement, and the corresponding number of data packet is selected to send. The admission control is performed at the transmission layer of the sending end, thereby guaranteeing that the data packet transmitted to the receiving end canarrive before the deadline, the retransmission caused by the random packet loss of the network is avoided, the delay is enlarged, and the retransmission cannot be avoided without using the redundancyencoding.

Description

technical field [0001] The invention belongs to the technical field of computer networks, in particular to a transmission layer control method oriented to data packet deadline. Background technique [0002] Existing transport layer protocols such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) provide very basic transport services for applications. The service provided by TCP is completely reliable transmission, and the delay is best effort; the service provided by UDP is unreliable transmission, and the delay is as low as possible. But there are many applications that require services between the two, requiring data to be delivered within a certain period of time. None of the existing transport layer protocols can meet this requirement. [0003] Existing schemes are divided into two categories: the first category modifies the intermediate routers to provide priority forwarding, access control and other differentiated services for a certain type of ...

AI Technical Summary

Problems solved by technology

This approach is limited by the performance of the router, and the granularity of admission control is very coarse. It can only be optimized for a large class of application data packets. There is no way to target each flow, and it is not easy to deploy by modifying the intermediate router.

The second type of method is to modify the packet sending rate of the application layer. The application layer monitors the network bandwidth and delay information in real time, and adjusts its own packet sending rate accordingly. This method increases the complexity of the application layer code and requires a lot of application architecture. Big changes bring a lot of burden to the application

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