Narasimha Challa

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This paper presents a novel class-based fair code allocation (CFCA) protocol to support delay and rate guarantees for realtime flows and to provide fairness for non-real-time flows on the downlink of WCDMAand VSF-OFCDM-based cellular networks. CFCA not only assigns bandwidth dynamically to different flows but also determines those appropriate OVSF codes(More)
We present a framework for a wireless health monitoring system using wireless networks such as ZigBee. Vital signals are collected and processed using a 3-tiered architecture. The first stage is the mobile device carried on the body that runs a number of wired and wireless probes. This device is also designed to perform some basic processing such as the(More)
This paper proposes a new scheduling scheme that exploits multiuser diversity to improve the shared channel utilization and the downlink capacity of the cell by reducing. the intra cell interference in CDMA based cellular networks with relays, The scheduling al­ gorithm accomplishes this by choosing a one hop (base station to mobile) or two hop (base(More)
This paper addresses the transmission of medical and context-aware data from mobile patients to healthcare centers over heterogeneous wireless networks. A handheld device, called personal wireless hub (PWH), of each mobile patient first gathers and aggregates the vital sign and context-aware data for various telemedicine applications. PWH transmits the(More)
This paper presents a novel code allocation scheme for multicasting in infrastructure-to-vehicle CDMA-based wireless networks. In a CDMA-based cellular network, to maximize the utilization of bandwidth and to minimize the overhead under varying channel conditions, the proposed scheme discusses how cellular and vehicular networks can collaborate in(More)
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