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This paper proposes an implementation of IEEE 802.21 MIH (Media Independent Handover) in Linux kernel space for cognitive and smart handovers. In the proposed scheme, the surrounding wireless access network information is collected and provided by IEEE 802.21 MIH, and the mobile node (MN) performs time-limited smart scanning with interleaved packet delivery(More)
Guaranteed QoS with seamless secure mobility is strongly required in near future Internet with heterogeneous wireless access networks. In order to provide QoS-guaranteed realtime services, the packet delivery should be continued with limited packet delay, jitter and packet loss. Through the extensive performance evaluations of PFMIPv6 we found that the TCP(More)
This work presents a new backoff algorithm, namely Maximum Throughput and Fairness aware Backoff (MTFB), for IEEE 802.11 wireless LANs. The algorithm adaptively adjusts the contention window (CW) size so that the maximum throughput and fairness can be maintained even with large number of active stations (STAs). In mixed environments with the legacy 802.11(More)
This paper describes the performance analysis of several existing backoff algorithms in terms of achievable throughput and short-term fairness. Through the performance evaluations conducted by the event-driven simulator we show the tradeoff of the maximum achievable throughput and short-term fairness. According to our investigations controlling the growth(More)
IEEE 802.11aa amendment introduces several protocols to increase the robustness of multimedia traffic delivery for multicast destinations. According to the recent investigations Block ACK protocol is the most efficient among them. However, it requires polling to each of the multicast group member which may cause significant overhead in the scenarios with(More)
IEEE 802.19.1 coexistence system provide two types of coexistence service: information service vs. management service. Information service provides radio environment information that enables 802.11af APs to facilitate channels with its neighbor APs. Each AP determines its operating parameters by itself to mitigate interference using the information. On the(More)