Wireless network seamless transfer method and device based on software-defined network

A software-defined network and wireless network technology, applied in the field of wireless network seamless handover method and its device, can solve the problems of mobility restriction, client IP address cannot be changed, etc., and achieve the effect of low network delay and flexible roaming service

Active Publication Date: 2015-09-23
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in today's wireless network networking mode, the client IP address

Method used

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  • Wireless network seamless transfer method and device based on software-defined network
  • Wireless network seamless transfer method and device based on software-defined network
  • Wireless network seamless transfer method and device based on software-defined network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0052] 1. Topology discovery module

[0053] Network topology discovery is divided into inter-switch link discovery and client wireless access discovery. Link information between switches is detected by sending LLDP packets between switches. LLDP is based on the Layer 2 network and allows network devices to advertise their device identifiers and capabilities in the local subnet. The client's wireless access information is obtained when the client sends an ARP request packet and forwards it to the controller when the client accesses the wireless network, and the controller analyzes the source address of the ARP packet.

[0054] 2. Flow table control module

[0055] The switching device matches the incoming data packet with its own flow table, and the matched data packet is forwarded according to the corresponding flow table entry, otherwise, the data packet is sent to the controller. The controller analyzes the data packet forwarded by the switching device, matches the g...

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Abstract

The invention discloses a wireless network seamless transfer method and device based on a software-defined network. By introducing a framework of the software defined network, the method and the device of the invention separate a data plane and a control plane in a network and improve a traditional distributed network into a centralized network. A client accesses two different APs in a wireless network by using double network cards, and a controller monitors network topological changes in real time and generates an appropriate flow table for corresponding conversion equipment, and establishes a corresponding logic link to enable the network service of the client not to be interrupted while the client is roaming in the range of the wireless network. The method has the advantages as follows: in comparison with the traditional network, the controller controls the data flow with finer granularity, issues the flow table according to the network topological changes and a network segment where the client is located, and correctly orients the data flow to the current position of the mobile client so that the client could roam across the network segments in the range of the wireless network, while the network service of the client is not interrupted, namely seamless transfer is achieved.

Description

technical field [0001] The invention relates to the technical problem of wireless network networking, in particular to a method and device for seamless handover of a wireless network based on a software-defined network. Background technique [0002] In recent years, the continuous development of network technology and the rapid growth of Internet services have promoted the market demand for wireless broadband networks, and the number of wireless broadband users has grown rapidly. Among many broadband technologies, wireless network technology will become an important part of future communication network technology. Under the coverage of wireless network, the mobility of wireless users has become a research hotspot in wireless network technology. Wireless network handover refers to a wireless user disconnecting from one AP to connect to an adjacent AP when moving within the coverage area of ​​the wireless network, and the network service is not interrupted during the process....

Claims

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Application Information

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IPC IPC(8): H04W40/30H04W36/08H04W40/24
CPCH04W36/08H04W40/246H04W40/248H04W40/30
Inventor 宋广华杨波威侯喆郑耀
Owner ZHEJIANG UNIV
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