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Software defined network-based space network QoS guarantee method and management center

A software-defined network and space network technology, applied in the field of space network QoS guarantee methods and management centers, can solve problems such as inability to adapt to the complex environment of space networks, and achieve the effects of optimizing space resource allocation, low packet loss rate, and low delay

Inactive Publication Date: 2016-10-26
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, this method is based on the DTN architecture to solve the problem that traditional protocols cannot adapt to the complex environment of the space network. The core technical problem to be solved is how to optimize resource allocation and provide on-demand services to meet the different QoS requirements of various services in the space network. Purpose of QoS Guarantee

Method used

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  • Software defined network-based space network QoS guarantee method and management center
  • Software defined network-based space network QoS guarantee method and management center
  • Software defined network-based space network QoS guarantee method and management center

Examples

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Embodiment 1

[0102] Embodiment 1 of the present invention provides a software-defined network-based DTN traffic service level identification method, such as Figure 5 shown. First, select the available ToS value according to the DSCP Differentiated Services Code Point specified in RFC2474, and specify the optional ToS value set for each service level in SNMC. Taking CoS2 with a ToS value of 120 as an example, for traditional Ethernet data streams, it is only necessary to affix a label of ToS=120 on the traffic of user 1 at the satellite gateway. However, the present invention uses the ION platform that implements the DTN architecture to deploy a space network. In view of the store-and-forward mechanism of DTN traffic, the ToS label is cleared after passing through each ION node because the forwarding flow is regenerated. The solution process based on software-defined networking is as follows:

[0103] Step 1: User 1 sends a QoS request for the required service to SNMC, which is a real-ti...

Embodiment 2

[0112] Embodiment 2 of the present invention provides a software-defined network-based space network link status monitoring method. like Image 6 shown.

[0113] Step 1: The control layer GEO satellite sends a Packet-out message encapsulated with a delay detection frame to the data layer satellite, and records the time stamp t when sending 1 ;

[0114] Step 2: The data layer satellite forwards the delay detection frame to the adjacent data layer satellite according to the forwarding port specified in the Packet-out message;

[0115] Step 3: After the adjacent data layer satellite receives the delay detection frame, it does not know how to forward it, so it sends it to the GEO satellite with a Pacekt-in message; the GEO satellite receives the Packet-in message encapsulated with the delay detection frame, at this time Record the timestamp t 2 ;

[0116] Step 4: The GEO satellite sends a Stats-request message to the data layer satellite, and records the sent timestamp t 3 ;...

Embodiment 3

[0125] Embodiment 3 of the present invention provides a traffic scheduling method based on QoS guarantee factors, such as Figure 7 shown.

[0126]The user accessing from SG1 needs the space network to provide CoS1, CoS2 and CoS3 services of three different service levels for it and the peer user accessing from SG3. Assume that the bandwidth of the link between LEO-MEO layers is 6Mbps, and the bandwidth within the MEO layer is 4Mbps. The bandwidth requirement of CoS1 is 3 Mbps, the bandwidth requirement of CoS2 is 1.5 Mbps, and the bandwidth requirement of CoS3 is 2 Mbps, and the delay requirement of CoS2 is higher than that of CoS3.

[0127] SNMC first authenticates the CoS1 data flow with the highest priority, and calculates an optimal QoS path for CoS1, invokes the service level identification service in SG1, affixes the label tos_cos1 to the CoS1 data flow, and according to the calculation result of the traffic scheduling module, Send the forwarding policy to the data la...

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Abstract

The invention discloses a software defined network (SDN)-based space network QoS guarantee method and a management center. An SDN-based space network is divided into a management layer, a control layer, and a forwarding layer, and includes a bottom-up information collecting process and a top-down strategy sending process. A satellite network management center in the management layer is an entity for making a QoS guarantee strategy, and the QoS guarantee strategy mainly includes the results in service grade authentication, traffic scheduling and bandwidth allocation, wherein service grade authentication is a process in which different service requests of users are distinguished according to the service grading standard, traffic scheduling is a process in which transmission paths meeting the QoS requirement are planned for data flows at different service grades, and bandwidth allocation is a process in which priority-based on-demand bandwidth resources are provided in a link sharing state. In addition, the invention provides a network status monitoring method in the control layer, which is the basis for the satellite network management center to make a QoS guarantee strategy. According to the invention, based on a controllable and manageable software defined network, space network resource allocation is optimized, on-demand service of the space network is realized, and the purpose of QoS guarantee is achieved.

Description

technical field [0001] The invention relates to the technical field of the Internet, in particular to a software-defined network-based space network QoS guarantee method and a management center. Background technique [0002] In the existing Internet, there is a space-ground integrated network architecture based on software-defined network and network function virtualization, which provides controllable and manageable network architecture by decoupling the data plane and control plane, and decoupling network functions and physical hardware. Information transmission and on-demand satellite services can optimize space resources, improve information transmission efficiency, meet QoS (Quality of Service) requirements, and adapt to the diversified development of future space networks. Among them, the spatial network part of the space-ground integrated network architecture is as follows: figure 1 As shown, the space network is divided into management layer, control layer and forwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/927H04B7/185H04L47/80
CPCH04B7/18519H04L47/805
Inventor 周华春叶玥李泰新李观文徐琪李光磊张宏科
Owner BEIJING JIAOTONG UNIV
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