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We propose a call flow for vertical handover procedure and a soft QoS scheme using dynamic programming (DP) approach for an efficient radio resource management in an environment where several different radio access networks (e.g., WLAN and WCDMA) coexists. We compare the soft QoS scheme with hard QoS scheme and propose a greedy and a DP approach for resource allocation scheme under a vertical handover...
To provide Authentication, Authorization, and Accounting (AAA) services, Diameter has become increasingly useful like the Remote Authentication Dial In User Services (RADIUS). Accordingly, in case that there may coexist RADIUS and Diameter in wireless LANs, protocol conversion is required for interworking between wireless LANs with different AAA mechanisms. In this paper, we propose a protocol conversion...
This paper proposes the use of TCP-Traffic differentiated model at wired-and-wireless boundary to alleviate the degradation of TCP performance and to reduce the energy expenditure. We assume that the wireless link is the bottleneck, which causes packet to be buffered at wired-cum-wireless interface buffer. This packet buffering at boundary node will cause the long delay for TCP retransmission packet...
To differentiate services for various traffic categories (TCs) in 802.11eD.2.0 [1], TCs possess different minimum contention window (CWmin) values, which are static over duration. Performances of low priority traffics (FTP) with higher CWmin values are suppressed even during absence of high priority traffics (video and voice). In...
Adaptive sectorization is one of the solutions for the capacity decrement resulted from the unbalanced traffic due to the users having nonuniform distribution among the sectors in cellular wireless communication system. It controls the sector size adaptively and balances the number of users on service among the sectors. It is not the capacity increment but the use of maximum capacity of the cell....
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