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Real-time communication system of novel network embedded type equipment

An embedded device and real-time communication technology, which is applied in the transmission system, using the return channel for error prevention/detection, electrical components, etc., can solve the problems of inability to realize real-time communication and consume large resources, and achieve low memory overhead and low resource consumption. Consumption, the effect of reducing the number of data copies

Inactive Publication Date: 2012-07-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to solve the problem that the operation of the existing TCP / IP protocol consumes a lot of resources, cannot meet the characteristics of low resources of the existing embedded devices, and cannot realize real-time communication, and proposes a new type of network embedded device real-time communication system

Method used

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  • Real-time communication system of novel network embedded type equipment
  • Real-time communication system of novel network embedded type equipment
  • Real-time communication system of novel network embedded type equipment

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Experimental program
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specific Embodiment approach 1

[0008] The specific embodiment one, a kind of novel network embedded device real-time communication system, it can be compatible with TCP / IP protocol, it comprises application layer, transport layer, network layer, network interface layer and physical layer, and application layer is made up of SNMP protocol module and HTTP It is composed of protocol modules; its protocol module is composed of PPP protocol module, IP protocol module, ICMP protocol module, UDP protocol module and TCP protocol module, PPP protocol module is composed of network interface layer and physical layer, IP protocol module and ICMP protocol module are composed of network layer, the UDP protocol module and the TCP protocol module form the transport layer;

[0009] The core of the PPP protocol module is a simplified version of the PPP finite state machine, and the simplified version of the PPP finite state machine is used to establish a network connection on a serial link. The process of establishing a netwo...

specific Embodiment approach 2

[0014] Embodiment 2. The difference between this embodiment and Embodiment 1 is that the process of establishing a network connection with the simplified version of the PPP finite state machine also includes an authentication phase. After the establishment phase is successful, the simplified version of the PPP finite state machine enters the authentication phase. After the authentication is successful, it enters the network communication stage. If the authentication stage fails, the simplified version of the PPP finite state machine closes the network communication and enters the termination stage.

[0015] In this embodiment, the authentication phase is an optional phase.

specific Embodiment approach 3

[0016] Embodiment 3. The difference between this embodiment and Embodiment 1 is that the ICMP protocol module is implemented as a transport layer protocol, and the ICMP protocol module is used to report error conditions and query host parameters.

[0017] In this implementation manner, the ICMP protocol module is implemented as a transport layer protocol to simplify processing. Currently, the ICMP module only supports the ICMP echo mechanism, that is, the ping function. When receiving an ICMP echo request packet from a remote host, it will automatically call new_icmp_input() to respond. By exchanging the source and destination IP addresses, changing the echo message type and restarting Calculate the ICMP checksum, generate an ICMP echo response packet and send it to the IP layer interface function.

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Abstract

The invention relates to a real-time communication system of novel network embedded type equipment, which solves the problem that the operation of the conventional TCP / IP (Transmission Control Protocol / Internet Protocol) consumes lots of resource. A protocol module is composed of a PPP (Point-to-Point Protocol) module, an IP module, an ICMP (Internet Control Messages Protocol) module, a UDP (User Datagram Protocol) module and a TCP module, wherein the core of the PPP module is a simplified PPP finite-state machine and comprises an abandoning phase, an establishing phase, a network communication phase and a finishing phase; the abandoning phase is firstly carried out and the establishing phase is carried out after a physical layer gets ready; a LCP (Link Control Protocol) is established successfully to enter an opening state; the simplified PPP finite-state machine enters a network communication phase; when an IPCP (Internet Protocol Control Protocol) is in an open mode, an IP data packet can be transmitted; when network communication is closed, the finishing phase is carried out to finish a communication link to return back to an initial abandoned state. The real-time communication system is used for an embedded type communication system with limited resources.

Description

technical field [0001] The invention relates to a real-time communication system of a novel network embedded device. Background technique [0002] Since Internet technology has been widely used, embedded devices have great advantages in using TCP / IP protocol clusters to realize interconnection with the network. Traditional TCP / IP implementations are capable of running on various interconnection technologies with different bandwidths and error rates. However, traditional technologies focus more on the compatibility of communication in different network environments rather than the resource consumption of the protocol. Running a complete TCP / IP implementation requires at least hundreds of KB of code and data memory. In order to control the cost, the embedded sensing node has typical characteristics of low resources, limited memory and computing resources. Therefore, considering the embedded application requirements of real-time and low resource consumption, it is not a good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08H04L1/18
Inventor 周海鹰左德承罗丹彦张展董剑舒燕君周鹏
Owner HARBIN INST OF TECH
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