Zhong Xu

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Due to the unique characteristics of Cyber-Physical Systems (CPS) such as interaction with the physical world, many new research challenges arise. Many CPS applications will be implemented on computing devices using mobile ad hoc networks (MANETs). Before these systems can be used in multifarious environments, the security properties of these networks must(More)
In wireless cellular networks, in order to ensure that ongoing calls are not dropped while the owner mobile stations roam among cells, handoff calls may be admitted with a higher priority as compared with new calls. Since the wireless bandwidth is scarce and therefore precious, efficient schemes which allow a high utilization of the wireless channel, while(More)
—Mobile ad-hoc networks (MANETs) are based on the cooperative and trust characteristic of the mobile nodes. Typically, nodes are both autonomous and self-organized without requiring a central administration or a fixed network infrastructure. Due to their distributed nature, MANETs are very vulnerable to various attacks. To enhance the security of MANETs, it(More)
In wireless cellular networks, a roaming mobile station (MS) is expected to move from one cell to another. In order to ensure that ongoing calls are not dropped while the owner mobile stations roam among cells, handoff calls may be admitted with a higher priority than newly generated calls. Predictive channel reservation (or pre-reservation) schemes allow(More)
Recently, we introduced a new congestion signaling method called ACK Spoofing, which offers significant benefits over existing methods, such as packet dropping and Explicit Congestion Notification (ECN). Since ACK Spoofing requires the router to create a " short circuit " signaling path, by matching marked data packets in a congested buffer with ACK packets(More)
We propose a new congestion signaling method to support Active Queue Management in IP networks called ACK (acknowledgement) Spoofing. ACK Spoofing enables the router to reduce the transmission rate for any responsive TCP source without needlessly reducing goodput (by dropping data packets in advance of buffer overflow), nor relying on TCP implementations to(More)