Channel Management of Multiple APs

1
Channel Management of Multiple APs

• Joseph Foglietta
• Nishant Divecha
• Derek Ng
• Marcel Bautista

2
Methods to be Implemented

• Depending on the performance, the proper method
  will be used for this project.
• RSSI
• Transmission Rate
• Open Channel Measurements (measuring channel
  noise when traffic is nonexistent)
• Noise Figure

3
RSSI

• Received Signal Strength Indicator
• Definition Wideband received power within
  relevant channel bandwidth
• Can be divided up into three levels
• Acceptable 63-36
• Poor 35-30
• No Connection Below 30
• Iron will reduce the RSSI by 10 units

4
DSSS Frequency Channel Plot
5
Algorithm

• Ten Access Points (APs)
• Place two on the same channel, and remaining
  eight APs on another
• Using our metric, we will obtain the information
  from both AP
• Based on some threshold, the APs channels will
  be reassigned.

6
Block Diagram First Algorithm
Turn all APs OFF
Turn one AP ON and set to Channel
Obtain metric (i.e. RSSI) Value
Below Threshold
Above Threshold
Change Channel to Non-interfering Channel
Check Threshold
Leave Channel Assignment
7
Channel Assignment Order

• The channel assignment is designed according to
  some threshold, which is based on the metric used
• If the value obtained is lower than the
  threshold, interference is assumed, and a new
  channel is assigned
• If the value is higher, the channel assignment is
  assumed to be non-interfering and is left alone
• The channel assignment order is obtained from the
  Spread Spectrum Plot

8
Block Diagram Second Algorithm
Assign APs channel according to SSID
Obtain RSSI values and sort numerically by RSSI
values
YES
Check if RSSI values areabove threshold
Exit Loop
NO
Check channel for first lowest RSSI value/AP
Assign second lowest RSSIvalue to a
non-interferingchannel