The AAL2 protocol was chosen as a transport protocol within the UMTS Terrestrial Radio Access Network (UTRAN). This protocol handles the radio channels between the mobile terminal and the Radio Network controller (RNC). On radio channels, the time constraints are stringent because of the synchronisation mechanisms at the MAC layer. The AAL2 protocol should guarantee a certain Quality of Service...

After a delay of some years, third generation mobile communication systems are beginning to be deployed. Thus, most European countries are currently involved in the installation of commercial UMTS networks based on the Release 99 set of specifications of the 3GPP. The main novelty of these first UMTS networks lies on the access segment, including both the radio and the fixed transmission infras...

By Christos K. Dimitriadis, Ph.D., CISA, CISM Mobile operators are organizations that provide telecommunication services over a cellular interface. The mobile industry initially consisted of infrastructures that provided voice and very limited data services through mobile phones. Modern mobile operators provide a wide range of multimedia data services, including video-on-demand and mobile Inter...

Different types of traffic with different Quality of Service requirements are competing for its resources. The 3G LTE accommodates smart selections of users and transmission of data through packets. In this paper, packet scheduler for LTE downlink is described and comparison of four basic packet scheduling algorithm is explained. It unties obscurity of dividing the packet scheduler into a time ...

This paper presents the results of a Quality of Service (QoS) study for VoIP service over 3G WCDMA networks. An end-to-end simulation platform has been used for this purpose. The simulations have been run using Adaptive Multi-Rate (AMR) speech codec at 12.2 kbit/s with combination of RTP, UDP and IPv6 protocols. The simulated transmission path includes two radio links (uplink and downlink), con...

In this paper, we analytically compare IP versus AAL2/ATM as a transport technology in the UMTS Terrestrial Radio Access Network (UTRAN), where stringent delay bounds are to be met for both real-time and non real-time traffic. We particularly select voice and Web traffic so as to illustrate our investigation. We show that, for the case of voice traffic, AAL2/ATM has a small advantage over IP, i...

In this paper, we have analysed the received signal without multipath at Additive White Gaussian Noise (AWGN) with a Signal to Noise Ratio (SNR) per sample, 10 dB, 8 dB, 6 dB and 4 dB respectively. We present the received signal with a multipath channel with noisy, the signal to noise ratio of 6 dB is studied and a multipath channel noiseless. And doing these studies, we considered the impulse ...

The provision of high capacity, low cost and reliable wireless multimedia communication for bursty packet traffic (as well as voice and delay constrained streaming traffic) continues to be a challenging aspect of future wireless communications systems. In this sense, structured and ad-hoc multihop networks and intelligent relaying are expected to play a significant role in 4G wireless communica...

In recent years, the WCDMA radio network performance has been studied with the focus on deployment of sectorized macrocells. The macrocellular layer will be enhanced by microcell base stations within the next two years. As the class of micro-FDD Node Bs differs in some important aspects from typical macro Node Bs, it is of interest to investigate the impact of these differences and to study eff...

The UMTS specification (Release 5), a third-generation mobile system, proposes an all-IP network architecture. In the near future, UMTS will offer a variety of services to users. Some of these services, e.g. real-time services, require a certain guaranteed quality of service. Multi Protocol Label Switching (MPLS) is a technology providing means to control data flows in IP networks. MPLS has bee...