Title: Paging Load simulation and regulation in the CMS30 mobile telephony system

Speaker: Jakob Näslund

Time and Place:

Wednesday, June 5th, at 14:00
Library, floor 2 at Magistern, Dag Hammarskjölds väg 31, Uppsala

Abstract:

This thesis investigates a load simulation and regulation of a paging function in the CMS 30 mobile telephony system. The CMS30 is Ericsson's implementation of the Japanese mobile telephony standard, Personal Digital Cellular (PDC). The paging function is the function that locates the mobile to a certain base station so that the call (voice or SMS) can be connected.

The purpose of the investigation is to find an overload protection mechanism for the load caused by paging on the control signalling links (CSL) from the visited mobile services switching centre (VMSC) to the base stations (BS). The thesis investigates two different approaches to overload protection on the control signalling links, one global and one internal. The result of the investigated internal overload control, the leaky bucket algorithm, concludes that the control signalling links is protected from overload according to requirements. The simulated global overload protection mechanism is intended to protect the system from being overflowed by global pages at a special traffic situation. Simulations show that this mechanism works very efficient, fair and simple.