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EvalVid Wireless

Evalvid wireless Video transmission over the wireless network has received tremendous attention from academe and industry due to increasing demand of wireless networks.

Challenges faced in wireless IP network:

  • Staying fair to concurrent traffic on the link.
  • Calculating desired rates from current status and collected statistics.
  • Differentiating between congestion loss and link error loss.
  • Transporting network feedback to the sender.
  • Providing stable transmission conditions for mobile users.
  • Minimizing delay and jitter for real-time applications.
  • Interpreting the feedback and notifying the transmitting applications.
  • Scaling the multimedia output rate from the sender.

Architecture of EvalVid Wireless Network

Architecture-of-EvalVid-Wireless-Network

Goals of wireless network:

  • Continue to serve existing mobile user applications.
  • Drive down costs by encouraging competition among wireless product vendors.
  • Define a class of wireless products suitable for computer LANs.

Features of wireless network:

  • Security
  • Mobility
  • Power management
  • Range and throughput
  • Ease of management etc.

Sample Code for EvalVid Wireless Projects

proc mylog { s } {
puts "proc mylog"
set now [ exec date ]
puts stdout "$now $s"
}
proc alive {} {
puts "proc alive"
global ns opt
set now_r [exec date]
set now_s [$ns now]
puts "$now_r $now_s"
$ns at [expr $now_s + $opt(alive_time)] "alive"
}
proc hcca-start {} {
puts "proc hcca-start"
global ns qap qsta val opt ;
[$qap getMac 0] start-hcca
for {set i 0} {$i < $val(n)} {incr i} {
[$qsta($i) getMac 0] start-hcca
}}
proc hcca-stop {} {
puts "proc hcca-stop"
global ns qap qsta val opt ;
[$qap getMac 0] stop-hcca
for {set i 0} {$i < $val(n)} {incr i} {
[$qsta($i) getMac 0] stop-hcca
}}


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