The Concept of QoS by ETSI

ETSI standard TS 102 250-2 v2.2.1 (2011) covering the QoS aspects for popular services in GSM and 3G networks. The standard divided into 6 parts book that identified below: 

•  ETSI TS 102 250 Part 1 identifies QoS criteria for popular services in GSM and 3G networks. They are considered to be suitable for the quantitative characterization of the dominant technical QoS aspects as experienced from the customer perspective. 

•  ETSI TS 102 250 Part 2 defines QoS parameters and their computation for popular services in GSM and 3G networks. 

•  ETSI TS 102 250 Part 3 describes typical procedures used for QoS measurements over GSM, along with settings and parameters for such measurements. 

•  ETSI TS 102 250 Part 4 defines the minimum requirements of QoS measurement equipment for GSM and 3G 

•  ETSI TS 102 250 Part 5 specifies test profiles which are required to enable benchmarking of different GSM or 3G networks both within and outside national boundaries. 

•  ETSI TS 102 250 Part 6 describes procedures to be used for statistical calculations in the field of QoS measurement of GSM and 3G networks using probing systems.  

General Consideration: ETSI identifies QoS criteria for popular services in GSM and 3G. They are considered to be suitable for the quantitative characterization of the dominant technical QoS aspects as experienced from the customer perspective. The criteria are described by their name and a short description from the customer point of view.

Phases of Service from the Customer's Point of View 

Figure shows different phases (Quality of Service aspects) during service use from the customer’s point of view. The five QoS aspects are: 

1.Network Availability: is the probability of a telecommunications service that can be offered to customers through a network infrastructure. 

2.Network Accessibility: probability that users can register on the network to be successful so that the network can provide telecommunication services. Network can only be accessed when it is available to the user. 

3.Service Accessibility: probability that the user can access the service you want to use., If the customer wants to use a service, the network operator should provide him as fast as possible access to the service 

4.Service Integrity: describes QoS while using the service and contains elements such as the quality of the content being transmitted, such as sound quality, video quality, and the number of bits transmitted error in the file. Service integrity can only be calculated if the service is accessible to success. 

5.Service Retainability: Service retainability describes the termination of services, in accordance with or against the will of the user. Explains how to end or terminate a service, whether or not the will of the user. Examples of service retain ability parameter are call cut-off ratio or the data cut-off ratio.