Naslov
Traffic load analysis on the HSS element in LTE networks

Autori
Vukšić, Marin

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, diplomski

Fakultet
Fakultet elektrotehnike i računarstva

Mjesto
Zagreb

Datum
01.07

Godina
2015

Stranica
58

Mentor
Ilić, Željko

Ključne riječi
LTE ; EPC ; IMS ; 3GPP ; AS ; HSS ; Diameter protocol ; Sh interface ; Poisson process ; exponential distribution ; linear traffic model ; uniform distribution

Sažetak
The LTE network, in comparison with earlier generations of mobile networks, introduces faster data rates, lower latency and higher quality of service. The main feature of such architecture is to provide communication on common IP-based protocols. This approach allows network users to use various multimedia services such as chatting application or conference calls. The architecture of the LTE network is divided into three parts: the access, the EPC (Evolved Packet Core) and the control domain. The IMS (IP multimedia subsystem) is located in the control domain and provides various types of multimedia services to end users. The interconnections between network components in the LTE and IMS are standardized under the 3GPP (3rd generation partnership project) organization. Furthermore, the service logic is deployed in the AS (Application Server), and the HSS (Home Subscriber Server) is the master database that contains the subscriber related data. The communication between the HSS and the AS is realized via the standardized Sh interface. The signalization Diameter protocol is used to provide this communication. This paper analyzes the characteristics of the HSS when it is overloaded with the following traffic models: Poisson, exponential, linear and uniform. Test cases were performed in order to determinate how much traffic load the HSS can handle. The task was also to develop a software that enables the implementation of desired traffic models. Furthermore, all IMS components are located at the Siemens CVC facility in Zagreb. The results of testing show that the exponential model overloads the HSS in the highest rate. Frequent changes in the frequency of sending causes large delay times and adds Diameter errors. This problem can be critical when the HSS is also overloaded on other interfaces. The results would be lower processing speeds and a larger amount of errors.

Izvorni jezik
Engleski

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