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Fast routing convergence optimization method for LEO/MEO (Low Earth Orbit/Medium Earth Orbit) satellite network

A satellite network and fast convergence technology, which is applied in the direction of data exchange network, radio transmission system, digital transmission system, etc., can solve problems that affect the convergence of network roads, increase routing overhead, and high fault misjudgment rate

Active Publication Date: 2016-11-09
DALIAN UNIVERSITY
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Problems solved by technology

[0003] First, in the fault detection phase of the RLSR protocol, in order to achieve fast fault detection, the number of confirmations for the detection message is only one time. Although it can effectively speed up fault detection, this detection method is not available for satellite networks with poor stability. Dynamic and high misjudgment rate of faults
[0004] Second, the RLSR protocol uses the flooding method in the link state notification LSA diffusion stage, which will increase the routing overhead in the satellite network, increase the possibility of network congestion, and increase the LSA queuing delay. Thereby affecting the path of the network to converge
[0007] Exponential algorithm uses a small initial value of spfHoldTime at the beginning. Once the topology changes frequently, spfHoldTime will quickly reach its maximum value, thus effectively limiting the update frequency of the routing table.
However, due to the high dynamic characteristics of the satellite network, when the exponential avoidance algorithm is used in the satellite network, spfHoldTime will quickly reach the limit value, which will cause a lot of time delay
Moreover, in the exponential avoidance algorithm, the timer is used as the only criterion for judging the update of the routing table, which will generate a large amount of unnecessary delay. For example, when there is only one LSA in the entire network, it is assumed that the router receives the LSA at time 0 , using the exponential avoidance algorithm will delay the time of spfDelay+spfHoldTime, and this delay is unnecessary, which will affect the convergence speed of the entire network

Method used

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  • Fast routing convergence optimization method for LEO/MEO (Low Earth Orbit/Medium Earth Orbit) satellite network
  • Fast routing convergence optimization method for LEO/MEO (Low Earth Orbit/Medium Earth Orbit) satellite network
  • Fast routing convergence optimization method for LEO/MEO (Low Earth Orbit/Medium Earth Orbit) satellite network

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Experimental program
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Embodiment 1

[0078] The routing fast convergence optimization method of LEO / MEO satellite network includes: the steps of dynamic bidirectional forwarding detection. Aiming at the problem of high misjudgment rate of RLSR, a dynamic bidirectional forwarding detection technology DBFD (Dynamic Bidirectional forwarding Detection) is proposed. The reliability parameters are assigned to the road and each node, and the reliability of the link and the node is set according to the number of failures of the link and the node in a satellite network cycle, and the sending interval of the end-to-end message is dynamically adjusted according to the reliability, so that It is able to adapt to the highly dynamic nature of satellite networks.

[0079] 1. Relevant parameter settings, specifically:

[0080] Two parameters are set inside each node: set the number of neighbor nodes as n, and the reliability level of neighbor nodes Reliability level of the peer link When a node failure occurs on node A, the ...

Embodiment 2

[0094] The routing fast convergence optimization method for LEO / MEO satellite network, including: the steps for coverage clustering of MEO / LEO satellite network, clustering is carried out according to the coverage of MEO satellite, the cluster head is served by MEO satellite, and then the repeated coverage nodes Coincidence Node and Free Node are further processed to complete the entire clustering process. This algorithm limits the routing hops of LSA diffusion and reduces routing overhead;

[0095] S1, satellite classification:

[0096] Given a satellite set S, according to the orbital height, the satellite set is divided into two categories: M={m i |i=1,2,...,m}, which means the set of mid-orbit satellites; L={l j |j=1, 2,...,n}, representing a set of low-orbit satellites;

[0097] e(i, j) represents the link between satellite i and satellite j, and E(i) represents the set of neighbor nodes of satellite i;

[0098] S2, determine the link weight:

[0099] Let d(s i ,s j...

Embodiment 3

[0107] Such as image 3 As shown, as a further supplement to Embodiment 2, due to the overlap of coverage areas of cluster heads, the same LEO satellite may be covered by multiple cluster heads, so it is necessary to further process the repeated coverage nodes. The processing method is as follows:

[0108] The first step is to traverse the set N, and set the repeated coverage node set Represents a cluster and the intersection of

[0109] like Then update N as

[0110] like Then update N as

[0111] like Assume where l k ∈ L ij . like Then update N as like Then update N as like Then update N,

[0112] like and traverse L ij Calculate d(m i , l k ) and d(m j , l k ), where l k ∈ L ij . If d(m i , l k )>d(m j , l k ),but If d(m i , l k )j , l k ),but If d(m i , l k ) = d(m j , l k ),Assume Represents a cluster The number of elements in . like then update the cluster for like then update the cluster for ...

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Abstract

The invention discloses a fast routing convergence optimization method for an LEO / MEO (Low Earth Orbit / Medium Earth Orbit) satellite network. The method comprises a step of carrying out dynamic bidirectional forwarding detection; a step of carrying out coverage clustering on the LEO / MEO satellite network; and a step of judging a fault type of the satellite network. During a fault detection stage, the fault detection speed is increased through the dynamic bidirectional forwarding detection; during an LSA (Link State Advertisement) diffusion stage, the routing overhead and the queuing delay are reduced through a coverage network clustering algorithm; and during a routing table updating stage, the updating delay of a routing table is reduced through an SFTJM (Satellite Network Fault Type Judging Method) algorithm, and the fast convergence of the whole network is finally realized.

Description

technical field [0001] The invention belongs to the field of satellite network dynamic routing protocol, in particular to a fast convergence optimization method for LEO / MEO satellite network routing. Background technique [0002] With the development of network communication, satellite network, as the extension of ground network, has attracted more and more attention of scholars. Due to the characteristics of large delay and high dynamics of the satellite network, the original routing protocol on the ground cannot adapt to the satellite network. At present, scientists at home and abroad propose to combine the virtual topology routing algorithm with the OSPF protocol and the dynamic routing protocol to improve the routing convergence speed of the satellite network. . The RLSR protocol is a representative of this type of protocol, but the protocol still has the following deficiencies: [0003] First, in the fault detection phase of the RLSR protocol, in order to achieve fast...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04L12/703H04L45/28
CPCH04B7/18519H04B7/18584H04B7/18597H04L45/28
Inventor 潘成胜来维庚杨力魏德宾
Owner DALIAN UNIVERSITY
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