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To expand the support for applications with QoS requirements in Wireless Local Area Networks (WLANs), the 802.11E task group was formed to enhance the current IEEE 802.11 Medium Access Control (MAC) protocol. The multipolling mechanism was discussed in the task group, but some problems remain unsolved. In this paper, we show a novel design of the(More)
The issue of data broadcast has received much attention in mobile computing. A periodic broadcast of frequently requested data can reduce the workload of the up-link channel and facilitate data access for the mobile user. Many approaches have been proposed to schedule data items for broadcasting. However, the issues of accessing multiple data items on the(More)
—Data broadcast is an excellent method for efficient data dissemination in the mobile computing environment. The application domain of data broadcast will be widely expanded in the near future, where the client is expected to perform complex queries or transactions on the broadcast data. To reduce the access latency for processing the complex query, it is(More)
To guarantee the delay and jitter bounds for real-time traffic, the polling scheme is commonly used in the IEEE 802.11 medium access control (MAC) protocol. However, the polling overhead becomes significant when the continuous and periodic real-time traffic is served. We propose a scheduling mechanism by which wireless stations can issue their frame(More)
—Delay-Tolerant Networks (DTNs) are special types of network environments that are subject to delays and disruptions. Traditional end-to-end routing fails in DTNs due to intermittent connections. We apply the concept of DTN to vehicular environments, and propose a new routing protocol that applies both diversity and accuracy in routing decisions. Our(More)
—Mobility management and quality-of-service (QoS) provisioning are the important tasks on the future development of wireless networks. The high host mobility makes these tasks more challenging. In this paper, we propose an architecture which supports both mobility and QoS management in Internet protocol (IP)-based wireless networks. In mobility management,(More)
Many approaches have been proposed to schedule data items for broadcasting in a mobile environment. However, the issues of accessing multiple data items on the broadcast channel are less discussed. In this paper, an efficient strategy for accessing multiple data items in mobile environments is proposed. Two issues are investigated in this paper, that is,(More)