Abstract
A UMTS network based on the Wide Band-CDMA technology is a 3 rd generation tele- communication system which provides various multimedia applications along with the conventional telephony service. These various multimedia applications fall into four different categories, which are differentiated from each other on the basis of required bit rate and delay tolerance etc. parameters. In order to get best Quality of Service (QoS) for a particular application running on the subscriber equipment the parameters of the respective category to which the application belong need to be in a required range. In this work the performance of a UMTS network scenario is evaluated by using various values of the precedence bits of the CBR application. The simulation tool used is QUALNET 5.0. The performance of the scenario according to the respective precedence bits is analyzed by four metrics: average jitter, end to end delay, throughput and UMTS signals received and forwarded to MAC. The comparative analysis of all the four metrics according to the precedence bit values will be carried out and it will be concluded in the last section that which precedence bit gives the best performance for the simulated UMTS network scenario.
Highlights
Capacity increase was one of the main motivations for introducing 2G systems in the early 1990s
In the Wide-band Code Division Multiple Access (WCDMA) architecture, the term NodeB refers to a logical node, responsible for physical-layer processing such as error-correcting coding, modulation and spreading, as well as conversion from baseband to the radio-frequency signal transmitted from the antenna
1: Priority (Packets with higher priority will get forwarded first) 2: Network 3: Internet (This bit is intended for use by gateway control originators only) 4: Immediate (This is for the sensitive data which needs to be attended first i.e. delayed data) 5: Flash-override (This is for video-traffic) 6: Flash (This is for higher class data traffic) 7: Critical (This is for VoIP traffic or real time traffic) QUALITY OF SERVICE (QoS) IN universal mobile telecommunications system (UMTS) – Quality of Service (QoS) is defined as the ability of the network to provide a service at an assured service level
Summary
Capacity increase was one of the main motivations for introducing 2G systems in the early 1990s. Different markets may evolve at different rates, e.g. Europe has medium-level fixed Internet penetration but leads the USA with high mobile communications penetration (based on the one standard — GSM). The access stratum includes protocols between the mobile terminal and the access network, and between the access network and the serving core network While the former support the transfer of detailed radio-related information, the latter are independent of the specific radio structure of the access network. This is important, it means that the CN should not be affected by the choice of radio transmission technologies in the access network, such that new types of access networks can be defined as and when required and attached to the existing core network. This is important, it means that the CN should not be affected by the choice of radio transmission technologies in the access network, such that new types of access networks can be defined as and when required and attached to the existing core network. [2]
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