00000cab a22000003a 4500 UP-99796217608899938 Buklod 20231007234006.0 m |o d | ta 090630s xx d | ||r ||||| || DENGII eng Fodor, G. Providing quality of service in always best connected networks. pp. 154-163 The next generation of mobile systems is expected to support multiple radio access technologies, as well as diverse types of terminals, including mobile phones, personal digital assistants, and laptops, as well as personal area, moving, and sensor networks. Thus, future wireless systems will not only continue to break technological barriers in terms of new air interface capabilities, higher bit rates, mobility, security, and QoS management, but will present new end-to-end scenarios in which applications access services over multiple L2 hops and multiple IP networks. The term always best connected refers to the concept of defining a set of access selection criteria and mechanisms that allow users to get connected to various services in a nearly optimal manner. Providing QoS in this type of heterogeneous multihop environment is a challenging task because applications may be completely unaware of them scenario and the underlying layer 2 technologies that can be quite different at different hops. For instance, some wireless links may have scarce resources and highly optimized QoS mechanisms; others may not support explicit QoS handling at all. In this article we consider the use of IP-level QoS signaling as a key component to support the end-to-end QoS for various applications. We propose a small set of application programmer- and wirelesslink-friendly IP QoS parameters (wireless hints) and illustrate the use of these in a specific WLAN-to-cellular handover situation. We conclude that the proposed model, signaling protocol, and wireless information elements can efficiently support QoS in heterogeneous mobile environments. QoS. WLAN-to-cellular handover situation. Access selection criteria. Air interface capabilities. Always best connected networks. Bit rates. Heterogeneous mobile environments. Laptops. Mobile phones. Mobile systems. Multiple IP networks. Multiple L2 hops. Multiple radio access technologies. Personal area networks. Personal digital assistants. Quality of service. Sensor networks. Signaling protocol. Wireless links. IEEE Communications magazine 41, 7 (2003). FO UPD DENG-II Article