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Performance evaluation of received power based call admission control techniques for W-CDMA uplink
No full textI3E: a Novel Call Admission Control Scheme for W-CDMA Systems
No full textEfficient Call Admission Control (CAC) techniques are of paramount importance to achieve a flexible
radio resource utilization with W-CDMA systems like UMTS. In order to accept or reject a call, the CAC scheme
should be able to estimate if the system can provide a Signal-to-Interference Ratio (SIR) high enough to the new
call and to all the others. With symmetric traffic the more critical direction for the system capacity is the uplink
and the CAC can consider this direction only. Received-Power based CAC (RP-CAC) are practical CAC schemes
proposed for the uplink that estimate the system load measuring the total power received at the base stations
(BSs). Simple RP-CAC schemes just compare the measured power at the BS where the call is initiated with a
threshold (Single Cell RP-CAC) or also measure the power received by neighboring BSs (Multi Cell RP-CAC).
More complex RP-CAC schemes try also to estimate the load increase due to the new call (Predictive RP-CAC).
In this paper we compare the performance of these schemes and propose a new Predictive scheme, named Iterative
Interference Increase Estimation (I3E). We show that the advantage of using multi-cell strategy with respect to the
single-cell one is negligible and that previously proposed Predictive RP-CAC techniques are not able to improve
the performance in a remarkable way. On the contrary, I3E CAC increases the accepted traffic while keeping the
call dropping probability very low, and its performance approaches the upper bound obtained considering an ideal
CAC
Performance evaluation of call admission control techniques for UMTS downlink
No full textThe main advantage of UMTS radio interface is its flexibility in resource management allowed by the W-CDMA (Wideband Code Division Multiple Access) access technique. However, to exploit this flexibility it is necessary to design an efficient Call Admission Control (CAC) scheme able to adapt the number of active calls in each cell according to interference levels and power availability. In this paper we analyze the performance of two CAC styles for voice services in downlink direction, one based on the number of active calls and one on run-time measures of the total power emitted by the base station (BS). Moreover, these two techniques are compared with the Ideal CAC scheme
Performance Evaluation of Point-to-Multi-Point (PMP) and Mesh Air-Interfacein IEEE standard 802.16a
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