Impact of GPRS on Existing GSM Services.

摘要

The main taks of this Thesis is to find out how much resources can be assigned to GPRS traffic and how this assignment affects the existing GSM services, mainly focusing on the impacts on the capacity of handover traffic. The main objective is to improve perceived quality of handover service by minimizing the probability of forced termination of ongoing calls due to handover failures. Throughout this research, we will understand how the existing GSM services are affected by GPRS due to the need of guaranteeing some QoS of GPRS service, and which parameters needed to be taken into consideration when the operators assign network resources for GPRS. The main performance criteria of interest in this Thesis are: probability of handover failure, probability of new call blocking, carried versus offered traffic, channel utilization and GPRS performance (e.g., throughput, delay, etc). The teletraffic performance of an overlaid GPRS/GSM network employing different handover prioritization policies is evaluated by simulations under a wide range of load situations as well as different percentages of GPRS users.