Discrete-time analysis of soft handoff in CDMA cellular networks

Abstract

Proper design of soft handoff mechanisms for CDMA cellular networks is critical to overcoming propagation impairments and providing a transparent radio access service for multiple data user profiles. The connectivity of the mobile user to the core network via an active set of access points is determined dynamically by the handoff algorithm via measurements of received pilot signal strengths. Using a discrete-time framework, we derive analytical expressions and develop associated numerical procedures for evaluating the soft handoff performance of a mobile unit travelling along an arbitrary straight-line trajectory in a CDMA cellular network. In particular, we obtain expressions for the cell assignment probabilities, which can be used to compute performance measures such as outage probability, macrodiversity gain, and signaling load. Our methodology provides an accurate and efficient means of designing and dimensioning high performance soft handoff algorithms for CDMA networks, while avoiding the need for approximations or time-consuming computer simulation.

Performance Enhancement of Cellular Network Using Adaptive Soft Handover Algorithm

“…In literature, soft handover parameters have been treated for performance evaluation of the algorithms using both analytical method and simulation methods [9,11,15,22]. A model has been proposed in [8] for computation of outage probability, macro diversity gain and signaling load.…”

Soft Handover Probability Determination Considering New Direction of Motion

“…The hard handover algorithms used in earlier GSM networks [1] are fairly simple but they can not be used to support multimedia services due to high blocking probabilities. This motivated development of lower blocking probability soft handover algorithms [2,3] for CDMA/ WCDMA 3G mobile systems along with power control algorithm to eliminate near-far effect. However, growing demand for supporting higher multimedia data rate, streaming video, and Internet services on 3G networks has been demanding further minimization of soft handover and its failure.…”

Discrete-time level-crossing analysis of soft handoff performance in cellular networks

“…For convenience, we shall assume that the mobile station moves at a constant speed of v 1 An early version of this work was presented in part in [1]. A discrete-time analysis of hard handoff performance is treated in [8], [9].…”

“…1 The formalisms developed in the course of our analysis are more generally applicable to the numerical solution of a class of level-crossing problems (cf. [10]) in discrete-time.…”