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In order to provide efficient handover (HO) of end to end connections, the cross IP/MAC layer design is proposed in this paper to integrate the procedures of hierarchical mobile IPv6 (HMIPv6) and the original WiMAX mobility. From the practical implementation point of view, the mobility anchor point (MAP) of HMIPv6 can be collocated either with the ASN gateway or CSN. In this paper, the message sequence...
Caching plays a key role in mobile computing because of, its ability to alleviate the performance and availability limitations of weakly-connected and disconnected operations. Caching frequently accessed data objects at the local buffer of a mobile is an efficient way to reduce query delay, save bandwidth and improve system performance. Classical cache management strategies may not be suitable for...
This paper presents an evaluation of a subband beamforming scheme for speech enhancement and acoustic echo suppression applications, such as hands-free telephony, internet telephony and video conferencing. The aim of the paper is to study the impact of the different types of subband filter banks on the speech enhancement performance. Results show that the octave band filter banks provide an effective...
We developed a quality of service (QoS) management system to support service level management (SLM) for global enterprise services. The QoS management system is integrated with one of our enterprise services in a preproduction system, an identical system as the production system but in a test environment. Lab experiments showed that our integrated solution helps global enterprise services to better...
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