Impact of actual interference on capacity and call admission control in a CDMA network.

An overwhelming number of models in the literature use average inter-cell interference for the calculation of capacity of a Code Division Multiple Access (CDMA) network. The advantage gained in terms of simplicity by using such models comes at the cost of rendering the exact location of a user within a cell irrelevant. We calculate the actual per-user interference and analyze the effect of user-distribution within a cell on the capacity of a CDMA network. We show that even though the capacity obtained using average interference is a good approximation to the capacity calculated using actual interference for a uniform user distribution, the deviation can be tremendously large for non-uniform user distributions. Call admission control (CAC) algorithms are responsible for efficient management of a network's resources while guaranteeing the quality of service and grade of service, i.e., accepting the maximum number of calls without affecting the quality of service of calls already present in the network. We design and implement global and local CAC algorithms, and through simulations compare their network throughput and blocking probabilities for varying mobility scenarios. We show that even though our global CAC is better at resource management, the lack of substantial gain in network throughput and exponential increase in complexity makes our optimized local CAC algorithm a much better choice for a given traffic distribution profile.

Grantor dc:publisher

University of North Texas

Year dc:date

2004

Author dc:creator

• Parvez, Asad

Contributors dc:contributor

• Akl, Robert G.
• Brazile, Robert
• Tate, Stephen R.

• Code division multiple access.
• interference
• user distribution
• CDMA
• capacity
• call admission control

Statement dc:rights

• Public
• Copyright
• Parvez, Asad
• Copyright is held by the author, unless otherwise noted. All rights reserved.

Language dc:language

English

Identifier

oclc: 55691981
https://digital.library.unt.edu/ark:/67531/metadc4496/
ark: ark:/67531/metadc4496

OAI identifier oai:identifier

info:ark/67531/metadc4496