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—To implement network coding, users need to coordinate and cooperate with respect to their strategies in terms of duplicating and transmitting side information across specific parts of the network. In unicast applications where users have no inherent interest in providing (or concealing) their information to (or from) any destinations except for their(More)
— In this paper, we address optimal network coding schemes for two-user unicast networks. Using previous results on the relationship between graph structure and information-theoretic capacity, we characterize the capacity region for a class of two-user unicast networks by finding a combination network coding/routing scheme to achieve an outer bound on(More)
As the demand for wireless broadband data services grows, it becomes increasingly important to address the issue of optimal resource allocation. Specifically, such allocation should address not only quality of service (QOS) requirements, but continually changing resource demands. This paper examines such optimal resource allocation through nonuniform rate(More)
— Increased demand for wireless broadband data services has led to a reexamination of system design, particularly with respect to optimal resource allocation. This paper considers a wideband CDMA network with arbitrary but known layout and variable rate assignments, which is connected to a traditional wired network. We show that, by using an optimization(More)
—In this paper, we examine the use of pricing for distributed, incentive-compatible and socially optimal resource allocation in a QoS-differentiated random-access wireless network. We argue that QoS mechanisms in wireless networks are susceptible to misuse by self-interested users. We first present a simple pricing scheme that leads to social optimality(More)
In this correspondence, we consider joint uplink and downlink rate allocations over a multiaccess/broadcast channel pair in a single-cell system. We assume a network of heterogeneous users, where the uplink utility of each user is held as private information and is unknown to the base station. The challenge is to design an optimal rate allocation scheme in(More)
This paper considers a wideband CDMA network with arbitrary but known layout and variable rate assignments, which is connected to a traditional wired IP network. We show that by using an optimization framework, it is possible to construct a distributed rate assignment algorithm similar to current congestion control protocols, which addresses both MAC and(More)