Modeling and analysis of CDMA soft handoff

PN offset optimization in CDMA system

“…After they were configured, M=5, N=6, P=1 and Q=0.5. Every cell of PN in "candidate PN set" was marked with a score using (6 The first two methods were adopted and the best choice of PN was 255 or 423 which were in List B. It can be envisioned that if 255 or 423 are OxC951 's new PN, two-way occurs probably, mobile terminal likely suffer failures of soft handoff and even dropped calls.…”

“…When one-way or two-way occurs, that is to say a mobile terminal is on condition of soft handoff and there exist two different cells sharing the same PN in its neighbor cell list [6], the mobile terminal will suffer failure of soft handoff in all probability. The first two methods can in a measure avoid one-way and two-way, but doesn't have steps of eliminating PN which will arouse appearance of one-way, two-way and adjacent PN-offset interferences, therefore, the two methods can't sufficiently figure out quality declination caused by PN interferences in CDMA networks and especially in regions with dense-distributed cells the disadvantages are more manifest.…”

Characterization of soft handoff in CDMA systems

“…The distributions of the residual times and probabilities and depend greatly on user movement and region size. These parameters can be measured in real/test environments and can also be obtained analytically or by simulation with one of the special mobility models in [1], [2], [15], and [16]. The distributions and the probabilities allow calculation of the handoff call attempt rate and the channel holding time using the equations in Section III.…”

“…However, as noted in [1] and [4], the handoff call attempt rate and the channel holding time are functions of the new call arrival rate, terminal mobility, priority scheme, and other factors. Park et al [15] and Kwon and Sung [16] proposed analytical soft-handoff models and calculated the probability distribution function of total sojourn time in an SR, and Cho et al [18] calculated the calling rates and the channel holding time in a soft-handoff environment. In these previous studies an MS did not request another soft handoff while being in an SR.…”

Contribución a la gestión de recursos en redes de acceso celulares. Modelos analíticos y evaluación de prestaciones

“…En [PSS96,KS97] los autores proponen un modelo analítico para el tiempo de ocupación de recursos en el área de handover. Este modelo es para un escenario de tipo Manhattan en el que el movimiento se produce únicamente en dos direcciones (horizontal y vertical) y la velocidad de los terminales sigue una distribución uniforme.…”