Dimitrios F. Tsirkas

Learn More
In mobile communications, mobility modeling is involved in several aspects related to signaling and traffic load analysis. In third generation systems, the influence of mobility on the network performance (e.g., handover rate) will be strengthened, mainly due to the huge number of mobile users in conjunction with the small cell size. In particular, the(More)
The necessity for employing various location management procedures, in conjunction with the millions of users expected to subscribe to third generation mobile telecommunication systems, will generate a huge amount of signalling load. In this paper, we propose a method which aims at the significant reduction of the signalling overhead on the radio link(More)
In third generation multi-operator mobile telecommunication systems, terminal operations will allow users to select the desirable operator among the ones available, provided that the user access rights are maintained. In this paper, three alternative (interoperator) roaming scenarios between public and private operators are proposed. The first scenario(More)
In mobile communications, distributed database systems fulfill the requirements of storing, accessing and updating user-related data (service profile, location and charging data, security related parameters, etc.). Second generation systems adopt the Home Location Register (HLR) / Visitor Location Register (VLR) concept, while for Third Generation (3G)(More)
  • 1