Robert Akl, D.Sc.

1
Robert Akl, D.Sc.

• Department of Computer Science and Engineering

2
Outline

• WiFi
• Access Point Selection
• Traffic Balancing
• Multi-Cell CDMA
• User Distribution Modeling
• Call Admission Control

3
Three Story BuildingDemand Clusters
4
Access Point Placement and Signal Level Map
5
14 Access Points and 20 Demand Clusters
6
AP Selection and Load Balancing
7
Congestion Factor per AP
8
Average Congestion Across Network
9
Multi-Cell CDMA SimulationUniform User
Distribution
10
Extreme Cases Using Actual Interference
Non-Uniform Distribution

• Maximum network capacity of 1026 with best case
  non-uniform user distribution

• Maximum network capacity of 108 with worst case
  non-uniform user distribution

11
Use 2-D Gaussian to Model User Distribution

• Mean 0 and standard deviation 200

• Mean 0 and standard deviation 500

12
Use 2-D Gaussian to Model User Distribution

• Mean 0 and standard deviation 900

• Non-zero mean, standard deviation between 100-300

13
Simulator Call Arrival and Admission Module
(Global CAC)
From call removal module
To call removal module
14
Simulator Call Removal Module (Global CAC)
From call arrival and admission module
To call arrival and admission module
15
Simulator Call Arrival and Admission Module
(Local CAC)
From call removal module
To call removal module
16
Simulator Call Removal Module (Local CAC)
From call arrival and admission module
To call arrival and admission module
17
Global CAC vs Local CAC

• Global
• Call admission based on all the calls present in
  the network.
• Slower.
• Inherently optimized.
• Adaptable.
• Complexity O(M).

• Local
• Call admission based on calls present in the cell
  under consideration only.
• Faster
• Optimized only for a given traffic distribution
  profile.
• Cannot compensate for big fluctuation in traffic.
• Complexity O(1)

18
(No Transcript)
19
(No Transcript)
20
Publications

• Journal
• R. Akl, A. Parvez, Global versus Optimized Local
  Call Admission Control in Multi-cell CDMA
  Networks, IEEE Transactions on Wireless
  Communications, paper no. TW04-624, under review.
• R. Akl, M. Hegde and M. Naraghi-Pour,
  Mobility-based CAC Algorithm for Arbitrary
  Traffic Distribution in CDMA Cellular Systems,
  IEEE Transactions on Vehicular Technology, paper
  no. VT-2003-00435, accepted.
• Conference
• R. Akl, Subscriber Maximization in CDMA
  Cellular Networks, Proceedings of CCCT 04
  International Conference on Computing,
  Communications, and Control Technologies CCCT
  04, August 2004, vol 3, pp. 234-239.
• R. Akl and A. Parvez, Global versus Local Call
  Admission Control in CDMA Cellular Networks,
  Proceedings of CITSA 04 Communications,
  Information and Control Systems, Technologies and
  Applications, July 2004, vol. 2, pp. 283-288.
• R. Akl and A. Parvez, Impact of Interference
  Model on Capacity in CDMA Cellular Networks,
  Proceedings of SCI 04 Communication and Network
  Systems, Technologies and Applications, July
  2004, vol. 3, pp. 404-408.

21
Thank You!!

• Questions?