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GoS and QoS in Telecommunication network

In telecommunication world, the quality of voice service specified by two factors :  GOS ( Grade of Service ) and QOS ( Quality of Service ). The Grade of  Service can be measured using different sections of a network. When a call is routed from one end to another, it will pass through several exchanges. If the Grade of Service is calculated based on the number of calls rejected by the final circuit group, then the Grade of Service is determined by the final circuit group blocking criteria. If the Grade of Service is calculated based on the number of rejected calls between exchanges, then the Grade of Service is determined by the exchange-to-exchange blocking criteria

The Grade of Service should be calculated using both the access networks and the core networks as it is these networks that allow a user to complete an end-to-end connection. Furthermore, the Grade of Service should be calculated from the average of the busy hour traffic intensities of the 30 busiest traffic days of the year. This will cater for most scenarios as the traffic intensity will seldom exceed the reference level

The telecommunications provider is usually aware of the required Grade of Service for a particular product. To achieve and maintain a given Grade of Service, the operator must ensure that sufficient telecommunications circuits or routes are available to meet a specific level of demand. It should also be kept in mind that too many circuits will create a situation where the operator is providing excess capacity which may never be used, or at the very least may be severely underutilised. This adds costs which must be borne by other parts of the network.

Different telecommunications applications require different Qualities of Service. For example, if a telecommunications service provider decides to offer different qualities of voice connection, then a premium voice connection will require a better connection quality compared to an ordinary voice connection. Thus different Qualities of Service are appropriate, depending on the intended use. To help telecommunications service providers to market their different services, each service is placed into a specific class. Each Class of Service determines the level of service required

To identify the Class of Service for a specific service, the network’s switches and routers examine the call based on several factors. Such factors can include.

In broadband networks, the Quality of Service is measured using two criteria. The first criterion is the probability of packet losses or delays in already accepted calls. The second criterion refers to the probability that a new incoming call will be rejected. To avoid this, broadband networks limit the number of calls so that packets from other calls will not be lost due to new calls arriving. As in circuit-switched networks, the Grade of Service can be calculated for individual switches or for the whole network

Many factors affect the quality of service of the telecommunication network. It is common to only look at QoS from the customer’s point of view, that is, QoS as judged by the user. There are standard metrics of QoS to the user that can be measured to judge the QoS. These indicators are: the coverage, accessibility (includes GoS), and the audio quality. In coverage the strength of the signal is measured using test equipment and this can be used to estimate the 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 for a period of time for the clarity of the communication channel. All these indicators are used by the telecommunications industry to judge the quality of service of the network

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January 4th, 2010 | Tags: , | Category: Cellular System

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