Abstract
Handoff mechanism is extremely important in cellular network because of the cellular architecture employed to maximize spectrum utilization. This unique feature has driven the rapid growth in the mobile network industry, changing it from a new technology into a massive industry within less than two decades. Handoff is the essential functionality for dealing with the mobility of the mobile users. This paper shows the soft handoff effects on the uplink direction of IS-95 CDMA networks is carried out, leading to optimize soft handoff for capacity under perfect power control approach. In practical systems, there is a nonzero handoff completion delay and soft handoff provides the required robustness to delays, although it comes at the expense of additional network resources. Thus, there is a tradeoff between the extent of soft handoff required and the handoff execution delay. This paper presents an analytical framework to study this tradeoff and also discuss simulation results simulated with the help of Matlab. For this, handoff dropping probability is minimized up to 0.1%.
Highlights
INTRODUCTIONCDMA is an attractive proposition for increasing cellular system capacity in dense urban areas, due to its many inherent benefits like the ability to mitigate multipath fading and interference, universal frequency reuse, soft handoff capability, and the ability to exploit voice activity detection
CDMA is an attractive proposition for increasing cellular system capacity in dense urban areas, due to its many inherent benefits like the ability to mitigate multipath fading and interference, universal frequency reuse, soft handoff capability, and the ability to exploit voice activity detection.CDMA employs what is known as a wideband spread spectrum technology to carry digitized voice and data transmissions
The performance parameters measured in this work is pilot signal measurement for handoff decision, call-blocking probability, Pb, handoff dropping probability, Pd, and Grade of service (GoS)
Summary
CDMA is an attractive proposition for increasing cellular system capacity in dense urban areas, due to its many inherent benefits like the ability to mitigate multipath fading and interference, universal frequency reuse, soft handoff capability, and the ability to exploit voice activity detection. As each voice is digitized at the mobile phone, it is assigned a unique digital code known as a Walsh code. This code assigned as a pseudorandom noise code that’s generated by the digital radio. At this point, the voice transmission has been encoded. This code is transmitted to the base station, where the voice is decoded, and regular call processing is completed This process is analogous to each mobile speaking a different language and the base station interpreting its own separate code.[1],[2]
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