                             Abstract In this paper, we propose an enhanced packet scheduling scheme to favour UEs that experienced handover (HO) in wireless mobile networks. The main idea of the proposed scheme is not only prioritized the HO connections at the CAC level but also prioritized the HO connections at the scheduler level. At the CAC level, a guard code scheme favours HO calls over new calls. At the scheduler level, a Packet Scheduler based-HandOver Class (PS-HOC) scheme makes use of the elapsed time of HO connections to classify the HO requests into prioritized HO and non-prioritized HO calls. Further, PS-HOC sorts the connections based on their delay sensitivity and their channel quality. The performance of the proposed scheme is compared with delay driven scheduler (DDS) scheme in terms of average packet delay, average queue size and average packet dropping rate. The simulation results show the effectiveness of our proposed scheme. Keywords: Handover, CAC, Packet Scheduling, QoS, WCDMA. 1. Introduction In wireless mobile networks (such as GSM, UMTS, HSPA, WiMax and LTE) the interruption of service due to the leak of supporting handover (HO) process is annoying and frustrating to the users [1]. In such networks both soft and hard handovers are possible and the employed handover procedure depends on the type of channel used by each service. For example, in UMTS systems dedicated channels used by conversational services are able to utilize soft handover while for the shared channels, used by streaming interactive and background services, only hard handover is possible. Consequently, both cases lead to poor network performance and should be avoided. As a result, it is important to favor HO requests over new call requests during the bandwidth allocation process. In wireless mobile networks, a connection admission control (CAC) algorithm in the core of the radio resource management (RRM) is devoted to accept as many new connections as possible, while maintaining the QoS for all the ongoing connections [2]. Therefore, CAC plays an important role at the maximization of the channel utilization. Many works have been proposed CAC schemes for different types of wireless mobile networks. Recently, the authors in [3] have introduced a CAC scheme based speed sensitive in the hierarchical heterogeneous wireless networks in order to measure the performance of traffic loss for multiservices. Further, the authors in [1], discussed and compared handover algorithms intended for WLAN, GSM, and UMTS according to signal strength and distance coverage area. Moreover, optimization of handover process in 3GPP LTE is proposed in [4]. On the other hand, the authors in [5] proposed a CAC based link adaptation in OFDM systems in order to take into account the effect of user mobility and AMC procedure. Most of the above works are focused only on the CAC scheme at the call level. However, at the packet-level QoS metrics (e.g., average packet delay and packet dropping rate) need to be maintained at the desired level. Therefore, the packet scheduler at RRM is necessary in order to decide the desired type of services and the prioritization of users in transmission [6]. We have proposed a RRM scheme [7] which favors the HO call at the CAC level and then we employed a delay driven scheduler (DDS) at the packet level which was aware to the delay requirements to all incoming calls (new and HO). In this work, we make use of the time delays of HO connections in handover area to establish a new link with base station in order to estimate the elapsed time of connections which are experienced handover. Therefore, we propose an enhanced packet scheduling scheme namely: Packet Scheduler based HandOver Class (PS-HOC) which aims to prioritize HO calls over the new calls at the packet level. Therefore, the main idea of the proposed scheme is not only prioritized the HO connections at the CAC level but also prioritized the HO connections at the scheduler level. As a focus here is on 3G mobile network based- WCDMA system is considered as a case study, the PS- HOC is fairly general to other mobile network scenarios. The rest of the paper is organized as follows. The WCDMA system model is presented in Section II. In Section III and Section IV, we introduce a snapshot of the prediction criterion and CAC scheme. The heuristic function of the elapsed time is described in Section V. The proposed PS-HOC scheme is introduced in Section VI. Finally, the simulation results are presented in Section VII and Section VIII concludes our work. Saied M. Abd El-atty 1 and Konstantinos Lizos 2 1 Department of Electronics and Electrical Communications, Faculty of Electronic Engineering, Menoufia University, Menouf, 32952, Egypt 2 Head of IT Department, Embassy of Greece Nobels gate 45, 0244, Oslo, Norway IJCSI International Journal of Computer Science Issues, Vol. 9, Issue 5, No 3, September 2012 ISSN (Online): 1694-0814 www.IJCSI.org 55 Copyright (c) 2012 International Journal of Computer Science Issues. All Rights Reserved.