The handover recovery latency is so unstable when the sta moving among APs about mininet-wifi

[ramonfontes]

Hello, I can help you if you provide more details. The code would be helpful as well. 2017-03-14 11:28 GMT-03:00 zhangze <[email protected]>:

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hi ，I choose a controller which support mobility to test the handover latency when a sta moving among APs , of course I use the mininet-wifi to simulate experimental environment. And I get a strange result : the handover latency is very different .The most handover latency is range between 2s and 5s , but there is also some 14s and 15s ,the unstable result troubled me, and I want to know whether I forget to deploy something at the APs or stas or the wireless links ?? Because I guess the instability may be associated with the wifi handover . — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#56>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmeiT4f0zG3Rfknos8SR-khwv-0juUks5rlqQDgaJpZM4Mcpmr> .

[zhangzee]

#!/usr/bin/python

"""
Setting the position of Nodes (only for Stations and Access Points) and providing mobility using mobility models.

"""

from mininet.net import Mininet
from mininet.node import Controller,OVSKernelSwitch
from mininet.link import TCLink
from mininet.cli import CLI
from mininet.log import setLogLevel, info
from mininet.node import Controller, RemoteController, OVSKernelSwitch, OVSSwitch

from mininet.wifiReplaying import replayingMobility

def topology():

"Create a network."
net = Mininet( listenPort = 6633,topo=None)
mycontroller = RemoteController("remoteController",ip="172.21.6.219")
net.controllers = [mycontroller]
net.nameToNode["remoteController"] = mycontroller

info( '*** Adding hosts\n' )
h1 = net.addHost( 'h1', ip='192.168.0.1/24', mac='00:00:00:00:00:01' )
h2 = net.addHost( 'h2', ip='192.168.0.2/24', mac='00:00:00:00:00:02' )

print "*** Creating nodes"
sta1 = net.addStation( 'sta1', mac='00:00:00:00:00:03', ip='192.168.0.3/24', speed=1 )
#sta2 = net.addStation( 'sta2', mac='00:00:00:00:00:03', ip='10.0.0.3/8' )
ap1 = net.addAccessPoint( 'ap1', ssid= 'new-ssid1', dpid='0000000100000001',mode= 'g', channel= '1', position='4,4,0', range='30'  )
ap2 = net.addAccessPoint( 'ap2', ssid= 'new-ssid2', dpid='0000000100000002',mode= 'g', channel= '1', position='55,17,0', range='30' )
ap3 = net.addAccessPoint( 'ap3', ssid= 'new-ssid3', dpid='0000000100000003',mode= 'g', channel= '1', position='105,23,0', range='30' )
ap4 = net.addAccessPoint( 'ap4', ssid= 'new-ssid4', dpid='0000000100000004',mode= 'g', channel= '1', position='20,55,0', range='30' )
ap5 = net.addAccessPoint( 'ap5', ssid= 'new-ssid5', dpid='0000000100000005', mode= 'g', channel= '1', position='73,65,0', range='30' )
ap6 = net.addAccessPoint( 'ap6', ssid= 'new-ssid6', dpid='0000000100000006',mode= 'g', channel= '1', position='120,78,0', range='30' )
ap7 = net.addAccessPoint( 'ap7', ssid= 'new-ssid7', dpid='0000000100000007',mode= 'g', channel= '1', position='0,105,0', range='30' )
ap8 = net.addAccessPoint( 'ap8', ssid= 'new-ssid8', dpid='0000000100000008',mode= 'g', channel= '1', position='50,102,0', range='30' )
ap9 = net.addAccessPoint( 'ap9', ssid= 'new-ssid9', dpid='0000000100000009',mode= 'g', channel= '1', position='99,118,0', range='30' )

info( '*** Adding switch\n' )
s1 = net.addSwitch('s1',dpid='0000000100000010')
s2 = net.addSwitch('s2',dpid='0000000100000011')
s3 = net.addSwitch('s3',dpid='0000000100000012')
s4 = net.addSwitch('s4',dpid='0000000100000013')
s5 = net.addSwitch('s5',dpid='0000000100000014')
s6 = net.addSwitch('s6',dpid='0000000100000015')
s7 = net.addSwitch('s7',dpid='0000000100000016')

print "*** Configuring wifi nodes"
net.configureWifiNodes()
print "*** Associating and Creating links"
net.addLink(s1, s2,1 , 1)
net.addLink(s1, s3,2 , 3)
net.addLink(s1, s4,3 , 3)
net.addLink(s1, h1,5 , 1)
net.addLink(s1, s5,4 , 2)
net.addLink(s2, s6)
net.addLink(s2, s7)
#net.addLink(s2, h2)

net.addLink(s3, ap1, 1, 2)
net.addLink(s3, ap2, 2, 2)
net.addLink(s4, ap3)
net.addLink(s4, ap6)
net.addLink(s4, ap5)
net.addLink(s5, ap8)
net.addLink(s6, ap4)
net.addLink(s7, ap7)
net.addLink(s7, ap9)
net.addLink(s7, h2)

#set the bw loss delay and so on 
net.setChannelEquation(bw='100', loss='0.04', delay='0', latency='0')

info( '*** Starting network\n')
net.start()

"""uncomment to plot graph"""
net.plotGraph(max_x=120, max_y=120)

getTrace(sta1, '/home/liangjun/mininet-wifi/examples/replaying/replayingMobility/node5.dat')
#getTrace(sta2, '/home/liangjun/mininet-wifi/examples/replaying/replayingMobility/node2.dat')

replayingMobility(net)
print "*** Running CLI"
CLI( net )

print "*** Stopping network"
net.stop()

def getTrace(sta, file):

file = open(file, 'r')
raw_data = file.readlines()
file.close()

sta.position = []

for data in raw_data:
    line = data.split()
    x = line[0] #First Column
    y = line[1] #Second Column
    sta.position.append('%s,%s,0' % (x, y))

if name == 'main':
setLogLevel( 'info' )
topology()

[zhangzee]

this is the experiment topology script , and the node5.dat is self-defined moving path among APs, And the whole network is controlled by the remote controller.

[ramonfontes]

What about the content of .dat files? I will ask you one more thing: could you prepare a video clip showing the behavior mentioned by you?

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Sent from my android

On 14 Mar 2017 12:03, "zhangze" ***@***.***> wrote: this is the experiment topology script , and the node5.dat is self-defined moving path among APs, And the whole network is controlled by the remote controller. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#56 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmet7_f4oqPcLVsmK7j1vE6LF88TSdks5rlqxTgaJpZM4Mcpmr> .

[zhangzee]

did you have a similar experiments? the reply support video clip ?

[ramonfontes]

Not yet. The reply doesn't support it, but you can send me the url (from dropbox?).

…

Sent from my android On 14 Mar 2017 12:17, "zhangze" <[email protected]> wrote: did you have a similar experiments? the reply support video clip ? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#56 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmepbei5tkdVzRRIDp3L-UL5DSZMrHks5rlq-fgaJpZM4Mcpmr> .

[zhangzee]

I donn't have dropbox, I think about this question . Thank you !

[zhangzee]

o , I guess the instability may be associated with the wifi access . Every access to wifi aps produces different access delay , so using the mininet-wifi as my experiment environment may be inappropriate unless I can fix the wifi access delay.

[ramonfontes]

What do you mean about wifi access?

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Sent from my android On 14 Mar 2017 14:07, "zhangze" <[email protected]> wrote: o , I guess the instability may be associated with the wifi access . Every access to wifi aps produces different access delay , so using the mininet-wifi as my experiment environment may be inappropriate unless I can fix the wifi access delay. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#56 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmeskeGnKvTZfyRlqajfghqXXAgDnOks5rlslggaJpZM4Mcpmr> .

[zhangzee]

For example , there are three APs(ap1, ap2, ap3) and one mobile node(sta ). The sta handover from ap1 to ap2 and from ap2 to ap3 , I mean the wifi access time from ap1 to ap2 is different from the sta handover from ap2 to ap3 . I just mean the wireless access time is uncertain. Is it?

[ramonfontes]

Are you sure this is not related to the openflow rules? That's why I want to see a video clip. Typing sta1 iwconfig you can also be sure if the station is already associated or not.

…

Sent from my android

On 14 Mar 2017 22:54, "zhangze" ***@***.***> wrote: [image: 1111] <https://cloud.githubusercontent.com/assets/22088840/23930038/d2aadc7c-0964-11e7-9983-1e60bddb6268.jpg> the up picture is my test environment ,And the node5.dat is like this [image: image] <https://cloud.githubusercontent.com/assets/22088840/23930116/4cfff11a-0965-11e7-9b48-c977bcb67625.png> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#56 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmevDDdxNCMWIrz9V3HWbAMYcQYdYUks5rl0TrgaJpZM4Mcpmr> .

[zhangzee]

Can you give me a email address? I try to give you a video clip .

[ramonfontes]

[email protected] 2017-03-14 23:25 GMT-03:00 zhangze <[email protected]>:

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Can you give me a email address? I try to give you a video clip . — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#56 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEnmettsEyeVfIn2i6_ph6FKh1TC9vJxks5rl0wigaJpZM4Mcpmr> .