Low-delay reliable transmission method of multi-market market quotation data in wide area network

Abstract

The invention relates to a low-delay reliable transmission method of multi-market market quotation data in a wide area network, which is characterized in that an LDDS protocol is arranged on the upperlayer of a UDP / TCP protocol, comprises product categories and is used for distinguishing different market quotation data; the message sequence number is used for the receiving service to judge whether packet loss or disorder occurs; the message type is used for standardizing whether the current message data belongs to retransmission or real-time market data; the publishing service directly performs UDP multicast to the retransmission service and each receiving service; the retransmission service is arranged at the downstream of the release service, the real-time market is cached quickly, andthe retransmission service and the release service are deployed in the same local area network; TCP long connection is established between the receiving service and the retransmission service, when packet loss occurs in the multicast quotation, accurate supplement is achieved through the retransmission service, multiplexing of multi-market quotation data in the transmission process is achieved bydesigning an LDDS protocol layer and increasing product category definition, and for the situation that the quotation data has wave crests and wave troughs and the convergence of multicast packet loss, an intelligent compensation mechanism is added, so that the processing performance is further improved, and the transmission delay is reduced.

Description

Technical field[0001]Specifically, the present invention is that the low-time delay of the wide area network can be transmitted, for the characteristics of market data, and the designs of low-time delay, by innovating the advantages of UDP and TCP transmission, design and increase custom low-time delay Low Latency Data Distribute System Protocol, LDDS and retransmission services, combined with intelligent retransmission mechanisms, achieving multi-market market data over a long-distance complex network environment reliable transmission.Background technique[0002]Quote data mainly includes a snapshot, a pencil, a pencil, and a pennying, including stock, bonds, funds, options, futures, and other securities varieties such as stocks. Since market data is very high for real-time requirements, it is not allowed to lose packet loss, and there is a cross-operator, cross-regional and exchange equipment, and therefore, the TCP transmission is basically selected. Way to achieve reliable transmi...

AI Technical Summary

Problems solved by technology

[0003] 1. When the same publishing node has multiple downstream clients, TCP can only use the polling mechanism, which affects the fairness of transmission to a certain extent;

[0004] 2. As the number of clients increases, the polling cycle becomes longer, which indirectly increases the transmission delay of each user;

[0005]3. As the stock market becomes more active, the content of market data to be transmitted increases rapidly, and the network delay caused by the confirmation mechanism of TCP transmission itself and congestion control will decrease increase rapidly;

[0006] 4. For example, when transmitting market data of multiple markets in a single TCP connection, the congestion of a single market data will cause other market data to be unable to be transmitted, resulting in head-of-line blocking;

[0007] V. During long-distance TCP transmission, due to its own confirmation mechanism and congestion control, data packets cannot be released quickly, which will indirectly lead to the inability to effectively occupy the bandwidth

Moreover, the above reliable multicast modes all adopt the confirmation and congestion control mechanism similar to TCP transmission to varying degrees, and there is still time delay consumption

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