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Heterogeneous wireless access networks will be deployed in many areas. IEEE802.11g and IEEE802.16e will become key technologies as means of providing wireless broadband access to mobile users. These two different wireless access technologies will co-exist while complementing each other in the near future; hence, a mobile node (MN) with dual interfaces will likely execute many handovers (HOs) between...
It is important for ubiquitous networks to survey a wireless area with required communication quality, i.e., communication quality required by an application. However, communication quality of wireless networks dynamically changes depending on various invisible factors. Nor can their influence be accurately estimated beforehand. Thus, actual wireless measurement is unavoidable. Existing wireless measurement...
Switching a communication path from one access point (AP) to another in inter-domain WLANs is a critical challenge for delay-sensitive applications such as voice over IP (VoIP) because communication quality during handoff (HO) is more likely to be deteriorated. To maintain VoIP quality during HO, we need to solve many problems. In particular, in bi-directional communication such as VoIP, an AP becomes...
2.4 GHz radio band is commonly used by many systems and appliances such as IEEE802.11b, Bluetooth, RFID, and even microwave ovens. Radio interference among these is often observed. Therefore, in 2.4 GHz inter-building wireless networks, available throughput temporally changes, which could yield serious packet error and/or packet loss. In this paper, we propose a new dynamic source rate control scheme...
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