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— In IEEE 802.16 networks, a bandwidth request-grant mechanism is used to accommodate various QoS requirements of heterogeneous traffic. However, it may not be effective for TCP flows since (a) there is no strict QoS requirement in TCP traffic; and (b) it is difficult to estimate the amount of required bandwidth due to dynamic changes of the sending rate.(More)
—Address allocation is an essential part in maintaining a mobile ad hoc network (MANET) effectively, and several address allocation schemes have been proposed. In this paper, we present a set of analytical models to evaluate the efficiency of address allocation schemes. The derived models quantitatively characterize the efficiency of four popular address(More)
Content-centric networking (CCN) is designed for efficient dissemination of information. Several architectures are proposed for CCN recently, but mobility issues are not considered sufficiently. We classify traffic types of CCN into real-time and non real-time. We examine mobility problems for each type, and suggest the possible hand-off schemes over CCN.(More)
—Queue length oscillation at a congested link causes many undesirable properties such as large delay jitter, underutilization of the link, and packet drops in burst. The main reason of this oscillation is that most queue management schemes determine the drop probability based on the current traffic without considering the impact of that drop probability on(More)
—The differentiated services architecture has been proposed for providing different levels of services and has recently received wide attention. A packet in a diff-serv domain is classified into a class of service according to its contract profile and treated differently by its class. While many studies have addressed issues on the diff-serv architecture(More)
This paper discusses techniques for achieving desired throughput guarantees in the Internet that supports diierentiated services framework. Dii-serv framework proposes using diierent drop precedences to achieve soft service guarantees over Internet. However, it has been observed that the drop precedences by themselves cannot achieve the desired target rates(More)