2,315 research outputs found
Effect of cell residence time variance on the performance of an advanced paging algorithm
The use of advanced sequential paging algorithms has been suggested as a
means to reduce the signaling cost in future mobile cellular networks. In a
proposed algorithm (Koukoutsidis and Theologou, 2003), the system can use the
additional information of the last interaction cell combined with a mobility
model to predict the short-term location probabilities at the time of an
incoming call arrival. The short-term location probabilities reduce the
uncertainty in mobile user position and thus greatly improve the search. In
this paper, an analytical model is derived that allows for a general
distribution of cell residence times. By considering a Gamma distribution, we
study the effect of the variance of cell residence times and derive useful
results on the performance of the algorithm.Comment: 8 pages, 3 figure
A Data Mining Approach for Location Management in 4G Wireless Heterogeneous Networks
A report submitted by Sherif Rashad to the Research and Creative Productions Committee in 2008 on the problem of location management. in the fourth generation (4G) of wireless mobile networks
Location Management Cost Reduction Using Adaptive Velocity-movement Based Scheme
Wireless personal communication networks (PCNs) consist of a fixed wireless
network and a large number of mobile terminals. These terminals are free to
travel within the PC coverage area without service interruption. Each terminal
periodically reports its location to the network by a process called location
update (or registration). When a call arrives for a particular mobile terminal,
the network will determine the exact location of the destination terminal by a
process called terminal paging. One major problem that arises in this scenario
is the cost associated with paging and registration. Several papers in the
literature attempt to reduce the cost by devising new schemes for paging and
registration. One of the many interesting schemes was presented by Wan and Lin (1998) that considers a dynamic paging scheme based on the semi-real
time velocity information of an individual mobile user, which allows a more
accurate prediction of the user location when a call arrives. In this paper, we
modified the scheme presented by Wan and Lin by creating an adaptive
velocity timer that changes according to the speed of the mobile and applies
the same analysis to the movement-based scheme. The investigation shows that
the proposed approach of Wan and Lin has better results than what was
reported therein and our new approach helps reduce the total cost drastically
compared to the original scheme. Results also show that the movement threshold
and the adaptive velocity time unit, when they are adaptive, provide significant
savings of cost under different cell sizes and velocities in high and low mobility
systems
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