College of Engineering Robert Akl, D.Sc. Department of Computer Science and Engineering.
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Transcript of College of Engineering Robert Akl, D.Sc. Department of Computer Science and Engineering.
College of Engineering
Robert Akl, D.Sc.Robert Akl, D.Sc.
Department of Computer Science and
Engineering
Department of Computer Science and
Engineering
10/8/2004 2
OutlineOutline
• WiFi
• Access Point Selection
• Traffic Balancing
• Multi-Cell CDMA
• User Distribution Modeling
• Call Admission Control
• WiFi
• Access Point Selection
• Traffic Balancing
• Multi-Cell CDMA
• User Distribution Modeling
• Call Admission Control
10/8/2004 9
Multi-Cell CDMA SimulationUniform User Distribution
Multi-Cell CDMA SimulationUniform User Distribution
10/8/2004 10
Extreme Cases Using Actual Interference Non-Uniform Distribution
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
10/8/2004 11
Use 2-D Gaussian to Model User Distribution
Use 2-D Gaussian to Model User Distribution
• Mean = 0 and standard deviation = 200 • Mean = 0 and standard deviation = 500
10/8/2004 12
Use 2-D Gaussian to Model User Distribution
Use 2-D Gaussian to Model User Distribution
• Mean = 0 and standard deviation = 900 • Non-zero mean, standard deviation between 100-300
10/8/2004 13
Simulator – Call Arrival and Admission Module (Global CAC)
For Cells(i) = 1 to M
No
Yes
For Cell(i) = 1 to M Calculate )(ti
)()()( ttt iii
for Cells(i)=1 to M Is ffi CeC )()()( tAttR iii
Calculate
1)()(
1)()(
tntn
tAtA
ii
ii
i
For new call arriving in cell i Calculate Calculate
UiC
From call removal module
To call removal module
10/8/2004 14
Simulator – Call Removal Module (Global CAC)
if
Yes
1i
No
Yes
No
Is callstaying innetwork
Is call moving toadjacent cell
Yes
No
For Cells(i) = 1 to M
1 ii
1)()( tntn ii
Update
Calculate new i
1)()(
1)()(
tntn
tt
ii
ijij
U
Calculate new j
j
To call arrival and admission module
From call arrival and admission module
10/8/2004 15
Simulator – Call Arrival and Admission Module (Local CAC)
For Cells(i) = 1 to M
For Cell(i) = 1 to M Calculate )(ti
)()()( ttt iii
)()( tnNitA ii
)()()( ttntn iii No
Yes
)()()(
)()(
tAttR
tNtn
iii
ii
)()( tAt ii if
From call removal module
To call removal module
10/8/2004 16
Simulator – Call Removal Module (Local CAC)
if
Yes
1i
No
Yes
No
Is callstaying innetwork
Is call moving toadjacent cell
Yes
No
For Cells(i) = 1 to M
1 ii
1)()( tntn iiCalculate new i
1)()(
1)()(
tntn
tt
ii
ijij
Calculate new j
j
To call arrival and admission module
From call arrival and admission module
10/8/2004 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)
10/8/2004 20
PublicationsPublications
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.
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.