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dc.contributor.advisorSharma, Vinod
dc.contributor.authorAnand, Kunde
dc.date.accessioned2010-07-29T09:00:16Z
dc.date.accessioned2018-07-31T04:50:07Z
dc.date.available2010-07-29T09:00:16Z
dc.date.available2018-07-31T04:50:07Z
dc.date.issued2010-07-29
dc.date.submitted2008
dc.identifier.urihttps://etd.iisc.ac.in/handle/2005/795
dc.description.abstractIn this thesis we address the problem of providing end-to-end quality of service (QoS) to real-time and data connections in a third generation (3G) cellular network based on the Universal Mobile Telecommunication System (UMTS) standard. Data applications usually use TCP (Transmission Control Protocol) and the QoS is a minimum guaranteed mean throughput. For this one first needs to compute the throughput of a TCP connection sending its traffic through the UMTS network (possibly also through the wired part of the Internet). Thus we obtain closed form expressions for a TCP throughput in a UMTS environment. For downloading data at a mobile terminal, the packets of each TCP connection are stored in separate queues at the base station (node B). These are fragmented into Protocol Data Units (PDU). The link layer uses ARQ (Automatic Repeat Request). Thus there can be significant random transmission/queueing delays of TCP packets at the node B. On the other hand the link may not be fully utilized due to the delays of the TCP packets in the rest of the network. In such a scenario the existing models of TCP may not be sufficient. Thus we provide new approximate models for TCP and also obtain new closed form expressions of mean window size. Using these we obtain the throughput of a TCP connection for the scenario where the queueing delays are non-negligible compared to the overall Round Trip Time (RTT) and also the link utilization is less than one. Our approximate models can be useful not only in the UMTS context but also else where. In the second half of the thesis, we use these approximate models of TCP to provide minimum mean throughput to data connections in UMTS. We also consider real-time applications such as voice and video. These can tolerate a little packet loss (~1%) but require an upper Bound on the delay and delay jitter (≤ 150 ms). Thus if the network provides a constant bandwidth and the received SINR is above a specified threshold ( with a certain probability), QoS for the real-time traffic will be satisfied. The 3G cellular systems are interference limited. Thus wise allocation of power is critical in these systems. Hence we consider the problem of providing end-to-end QoS to different users along with the minimization of the downlink power allocation.en_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesG22315en_US
dc.subjectWireless Communication Systemsen_US
dc.subjectRadio Communicationen_US
dc.subjectUniversal Mobile Telecommunication System (UMTS)en_US
dc.subjectTransmission Control Protocolen_US
dc.subjectQuality of Service (QoS)en_US
dc.subjectTCP Approximate Modelsen_US
dc.subjectCellular Networksen_US
dc.subjectRadio Link Control (RLC)en_US
dc.subjectTCP Connectionsen_US
dc.subjectUMTS Networken_US
dc.subject3G Wireless Systemsen_US
dc.subjectRadio Interface Protocolsen_US
dc.subject.classificationCommunication Engineeringen_US
dc.titleProviding QoS To Real-time And Data Applications In 3G Wireless Systemsen_US
dc.typeThesisen_US
dc.degree.nameMSc Enggen_US
dc.degree.levelMastersen_US
dc.degree.disciplineFaculty of Engineeringen_US


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