Multi-Service Access Capacities Analysis of TDDCDMA System with Soft Blocking

Abstract

This paper represents a method based on generalizing Delbrouck's algorithm for calculating the access capacities of multi-service time division duplex-code division multiple access (TDD-CDMA) networks. The method models the system as a multi-service model with state dependent soft blocking probabilities, and it uses the soft capacity limit caused by TDD-CDMA system in calculating the call blocking rate of multi-services. The traffic models used in this method are insensitive to the service time distribution and thus the method is very robust for applications. So it is more accurate than multi-dimensional Erlang-B formula, which does not consider the soft capacity, and it is also simpler than resolving the complex linear system equations with soft capacity. The paper provides both analytical results and simulation results to support the method, and these results match. Thus the proposed method can be used in TDD-CDMA network dimensioning and optimizing.