Suresh Kalyanasundaram

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The problem of handoffs in cellular networks is compounded in a low earth orbit (LEO) satellite-based cellular network due to the relative motion of the satellites with respect to a stationary observer on earth. Typically, the velocity of motion of mobiles can be ignored when compared to the very high velocity of the footprints of satellites. We exploit(More)
Dynamic Point selection (DPS) is a key Downlink (DL) Coordinated Multipoint (CoMP) technique that switches the serving data Transmission Point (TP) of a User Equipment (UE) dynamically among the UE's cooperating set of TPs without requiring a cell handover. It provides performance improvement due to TP selection-diversity gains and dynamic UE load balancing(More)
Liu, Xin. Ph.D., Purdue University, December, 2002. Opportunistic Scheduling in Wireless Communication Networks. Major Professors: Edwin K. P. Chong and Ness B. Shroff. Wireless spectrum efficiency is becoming increasingly important with the growing demand for wideband wireless services. In this dissertation, we present a unified framework for opportunistic(More)
In this paper, we consider the Single Frequency Network (SFN) operation of broadcast/multicast services, and develop resource allocation schemes to minimize the amount of resource over-provisioning. Over-provisioning is required when SFN areas are overlapping because all the cells in the SFN area should use the same resource to transmit a given MBMS(More)
Femtocells are low-cost, miniature basestations intended to improve indoor coverage in 3G networks and beyond. One of the main issues in adopting femtocells en masse is the surge in interference to the mobile users served by the macrocell arising from unplanned networks and private access. Therefore, distributed power control mechanisms for femtocells are(More)
In this work, we consider the problem of resource allocation in multi-class networks, where users specify the value they attach to obtaining different amounts of resource by means of a utility function. We develop a resource allocation scheme that maximizes the average aggregate utility per unit time. We formulate this resource allocation problem as a(More)
In this work, we consider the scenario where di€erent classes of trac with di€ering bandwidth requirements are to be supported over a link with ®nite capacity. The network will be required to meet class-level quality-of-service (QoS) constraints that are speci®ed as relations between the call blocking probabilities of these trac classes. The network will(More)
Orthogonal Frequency Division Multiple Access (OFDMA) is the preferred multiple access scheme for future broadband cellular systems as it provides high spectral efficiency. The choice of OFDMA scheduler and the amount of channel quality feedback from users together determine the achievable throughput and fairness. Channel quality reporting by all active(More)