Networking and Communication Engineering

K. Ayyappan ¹, R. Kumar ²

Affiliations
1 ECE Department of Rajiv Gandhi College of Engineering and Technology, Pondicherry, IN
2 Department of Electronics and Communication Engineering, SRM University, Chennai, IN

Abstract

The wide-band code division multiple access (WCDMA) based 3G and beyond cellular mobile wireless networks are expected to provide a diverse range of multimedia services to mobile users with guaranteed quality of service (QoS). To serve diverse quality of service requirements of these networks a new radio resource management strategies for effective utilization of network resources is required. For that Adaptive Multi-Rate (AMR) will be used for voice applications in universal mobile telecommunication System (UMTS) systems where high spectral efficiency and system stability are required while guaranteeing a good speech quality. To investigate the trade-off between the system resource utilization and the provided quality of voice services, by proposing a method that considers both aspects of quality and capacity for the optimal assignment of speech data rates in 3rd generation cellular systems in this paper. So a new Call Admission Control (CAC) scheme is proposed to enhance capacity of WCDMA network based on the utilization services with AMR for different decision decoder. The model of this network is valid for the real-time (RT) and non-real-time (NRT) calls having different data rate. Simulation results demonstrate the capacity of the network using utility based CAC scheme with soft decision decoder is higher than that of hard decision decoder.

Keywords

Call Admission Control, Wide Band Code Division Multiple Access, Wireless Networks, Quality of Service.

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K. Ayyappan ¹, R. Surender ², R. Kumar ³

Affiliations
1 ECE Department of Rajiv Gandhi College of Engineering and Technology, Pondicherry, IN
2 Electronics and Communication Engineering Department of Sri Manakula Vinayagar College of Engineering and Technology, Pondicherry, IN
3 Department of Electronics and Communication Engineering, SRM University, Chennai, IN

Abstract

Next generation wireless network is envisioned as a convergence of different wireless access technologies providing the user best connection any where any time to improve the systems resource utilization. In such converged systems, the heterogeneous co-existence of access technologies with largely different characteristics results in handoff asymmetry that differs from traditional intra-network handoff (horizontal handoff) problem. The seamless and efficient handoff between different access technologies (vertical handoff) is essential and remains a challenging problem. The parameters measured to determine handoff are received signal strength, signal to noise ratio and bit error rate. In this paper, an analytical framework to evaluate the performance of vertical handover between wireless access networks in terms of received signal strength, is validated by simulation. It is likely that WLAN will become an important complementary technology to 3G cellular systems and typically used to provide hotspot coverage where there is a high density of users.

Keywords

Heterogeneous Wireless Networks, Wireless LAN, Hiperlan, Handoff, Path Loss, Received Signal Strength.

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