Amin Belhocine
ABSTRACT
Wireless telecommunications technologies are part of everyday life and represent an essential communication mean in almost all activities. Among these technologies WIFI (Wireless Fidelity) and UMTS (Universal Mobile Telecommunications System) are the most common, and further, they are complementary; WIFI covers small areas with large bandwidth while UMTS covers bigger areas with reduced bandwidth.
WIFI and UMTS use different approaches to treat QoS (Quality of Service), thus in order to provide transparent handling of multimedia applications, WIFI and UMTS must agree on QoS parameters. This QoS incompatibility is principally due to their design and physical characteristics. Contrary to the felling that one can have, WLAN QoS is not better than UMTS QoS, even if WLAN provides larger bandwidth.
In this study, we will illustrate QoS mechanisms in WLAN and UMTS networks respectively. Next, QoS in WLAN-UMTS interworking systems will be presented. Then, QoS issues in WLAN-UMTS systems will be highlighted, and further, we will address several reasons to justify the fact that WLAN QoS is not better than that of UMTS. And finally, we conclude by indicating future direction to reach better QoS in WLAN-UMTS systems.
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Index Terms
- Analysing QoS in WIFI-UMTS interworking systems
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