The effects of inter-layer handover on the reverse link performance in CDMA overlaying systems

In this paper, the effect of inter-layer handovers on the reverse link performance in terms of signal to interference ratio (SIR) in an overlaying coverage is investigated. A method has been proposed to estimate the additional interference introduced by inter-layer handover. The numerical results show that the inter-layer handover in both directions (i.e. macro-to-micro layer and micro-to-macro layer) could cause SIR deterioration on the reverse link. The use of soft handover for the intra-layer could compensate the deterioration to a certain extent. The results also show that the SIR deterioration heavily depends on both the user´s location and the propagation environments (path-loss and shadowing). Additionally, it is shown that the imperfect power control could cause even more deterioration on the reverse link