QoS v systému UMTS
| Autor: | Kavan, Radovan |
|---|---|
| Jazyk: | čeština |
| Rok vydání: | 2009 |
| Předmět: |
load
layer bearer NGB Blocking probability služba downlink HO HC GSM Dropping probability PS RRM UTRAN LC service priorita zátěž priority PC uplink load factor AC QoS CC 3GPP UMTS GB CR pravděpodobnost odmítnutí uživatele vyjma HO uživatelů nosná vrstva WCDMA činitel zatížení pravděpodobnost odmítnutí HO uživatele MS UE GERAN |
| Druh dokumentu: | masterThesis |
| Popis: | This thesis treats of QoS (Quality of Service) in UMTS system. The term quality of service is frequently used, recently, however not only in computer networks, but also more and more in mobile networks also. Present system of 2nd generation (2G) GSM enables only limited exploitation of QoS function. System UMTS is a system of 3rd generation (3G) already and contains quality of service in greater measure which is ensured with number of algorithms and functions. Individual QoS functions enable effective utilization of radio interface, support maintenance of planned coverage and offer high spectral efficiency. Functions that cater to quality of service are called RRM functions (Radio Resource Management). There exist five basic functions in UMTS system that are Admission control (AC), Power control (PC), Load control (LC), Handover control (HC) and Packet scheduler (PS). These functions are responsible for control of network access, control of power, control of network load, control of handover and packet (bit rate) scheduling. Last three functions are usually collectively designated as Congestion control, control of network overload. UMTS layer model, differentiation of services, traffic classes and 3GPP concept are also discussed. In thesis the attention is piad to Admission control algorithm – control of network access – in the uplink direction and to different ways of load (in the cell) modeling. Individual approaches are simulated in MATLAB. A possibility of using algorithm in the real system is discussed in conclusion. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|