As the worldwide market of cellular phone increases, many subscribers have come to rely on cellular phone services. In catastrophes or mass call in situations, the load can be greater than what the cellular network can support, raising serious concerns on the network's survivability in order to provide necessary services such as 911 calls. In high load cases, overload control must be deployed to reserve network resource for emergency traffic and maintenance services. Over the past several years, many catastrophes have revealed the deficiencies of the existing overload control mechanisms in cellular networks. Improvement to the existing overload controls are needed to cope with unexpected situations. A key to the survivability of cellular networks lies in the signaling services from database servers that support a call connection throughout its duration. Thus, this dissertation focuses on an overload control at the database servers.1.0 INTRODUCTION 1.1 INTRODUCTION TO THE STUDY The cellular phone industry has grown dramatically over the past two decades. ... This problem was caused partly by the outage of the cell site on the World Trade Center and by the sheer volume of calls. ... 2005, the problem of overload was still unresolved and became clearer when one of Verizona#39;s 911 cellphone systems failed in a storm [ 13].
|Title||:||Signaling Overload Control for Wireless Cellular Networks|
|Publisher||:||ProQuest - 2008|