An important feature that is expected to be owned by today s mobile computing systems is the ability of processing locationdependent continuous queries on moving objects. The result of a location-dependent query depends on the current location of the mobile client which has generated the query as well as the locations of the moving objects on which the query has been issued. When a location-dep...

Location management refers to the problem of updating and searching the current location of mobile nodes in a wireless network. To make it efficient, the sum of update costs of location database must be minimized. Previous work relying on fixed location databases is unable to fully exploit the knowledge of user mobility patterns in the system so as to achieve this minimization. The study presen...

We present a simple first order analysis comparing three dynamic location update schemes that have been proposed for mobility management in cellular networks. The analysis is used to compare the relative performance of the three schemes and to illustrate the tradeoff between the costs of frequent location updates and paging.

Heretofore several position-based routing protocols have been developed for mobile ad hoc networks. Many of these protocols assume that a location service is available which provides location information on the nodes in the network.Our solutions decrease location update without loss of query success rate or throughput and even increase those.Simulation results show that our methods are effectiv...

The recent shift in processor development leads to massive parallelism in multiand many-core processors. So, together with the wide-spreading use of cluster technologies, this development leads to huge networks of cores and processors. The development of applications that exploit this increasing parallelism is a hard task, for which only a small fraction of programmers is prepared. One approach...

A distributed mobility management scheme using Randomized Database Groups (RDG) is proposed and analyzed for ad-hoc networks. In the proposed scheme, location databases are stored in the network nodes, comprising a virtual backbone within the flat network architecture. Upon location update or call arrival, a mobile’s location information is written to or read from, respectively, a group of rand...

mobility. However, in case of failed location update, a significant consequence is the obsolete location identity in the network databases and thereafter the incapability in establishing the valid route for the potential call connection, which will seriously degrade the network quality-of-service (QoS). This issue is not theoretically studied in the literature. In this paper, we perform a quant...

By using position information in forwarding decisions, location based routing protocols for mobile networks are stateless and efficient. However, they are heavily dependent on location services which provide the position information of the desired destination node. Although several location service schemes have been proposed, their main goal is just to find the location of the destination node....

An important issue in the design of a mobile computing system is how to manage the location information of mobile clients. In the existing commercial cellular mobile computing systems, a twotier architecture is adopted (Mouly and Pautet, 1992). However, the two-tier architecture is not scalable. In the literatures (Pitoura and Samaras, 2001; Pitoura and Fudos, 1998), a hierarchical database str...