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cleanupWhat pokernews is quality of service?Quality of service is a measure of the reliability and usability of the telecommunications network mn cellular companies have to offer a quality service to customers just as the fixed line PSTN companies have to. The quality is called QoS . Part of Qos is Grade of service of service or GoS.Factors affecting QoSMany factors affect the quality of service of the network. It is common to only look at QoS from the customers point of view, that is, QoS as judgedby the user. There are standard pokernews metrics of QoS to the user that can be measured to judge the QoS. These indicators are: the coverage,accessibility

, and the audio quality mn In coverage the strength of the signal is measured using test equipment and this can be used to estimatethe size of the cell. Accessibility is about determining the ability of the network to handle successful calls from mobile-fixed networks and from mobile-mobile networks. The audio quality considers monitoring a successful call

for a period of time for the clarity of the communication channel. All these pokernews indicators are used by the telecommunications industry to judge the quality of service of the network mn of QoSThe QoS in industry is also measured from the perspective of an expert . This involves assessing the network to see if it delivers the quality that the network planner requires. Certain tools and methods , are used for this QoS measurement mn

analysers are connected to BTSs, BSCs, and MSCs for a period of time to check for problems in the cellular network. When a problem is discovered the staff can record it and it can be analysed mn tests allow the network to be tested through pokernews the use of a team of people who take the role of users and take the QoS measures discussed above to judge the QoS of the network. This test does not apply to the entire network, so it is

always a statistical sample. Finally, customer complaints are a vital source of feedback on the QoS, and must not be ignored.Cellular pokernews GoSIn general, GoS is measured by looking at carried traffic, offered traffic and calculating the lost traffic. The proportion of lost callsis the measure of GoS. For cellular circuit groups an acceptable GoS is 0.02. This means that two users of the circuit group out of hundred will encounter a call refusal during the busy hour at the end of the planning period. pokernews The grade of service standard is thus the acceptable level of traffic that the network

can lose. GoS is calculated from the Erlang-B formula as a function of the number of channels required for the offered traffic intensity.Cellular audio qualityThe audio quality of the cellular network depends on the modulation scheme used to match the channel characteristics and the processing pokernews of the received signal at the receiver using Digital Signal Processor mn Heine, G. GSM Networks: Protocols, Terminology, and Implementation. ARTECH HOUSE, INC. Boston. London, 1999 Chapter 13.mnb Quality of Service Indicators. Last accessed 15 March 2005.mnb Chitamu. P.J., Telecommunications Access Networks. University of the Witwatersrand, Johannesburg, 2005.