throughput optimization in high speed downlink packet access (hsdpa) - abstract by coreieeeprojects
DESCRIPTION
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Core IEEE Projects (Division of Conceptz)
#108,5th Main, 4th Cross, Hanumanth Nagar, Basavanagudi, Bangalore-50, Website: www.coreieeeprojects.com contact: 9535052050
ABSTRACT
In this paper, we investigate throughput optimization in
High Speed Downlink Packet Access (HSDPA). Specifically, we
propose offline and online algorithms for adjusting the Channel
Quality Indicator (CQI) used by the network to schedule data
transmission. In the offline algorithm, a given target BLER is
achieved by adjusting CQI based on ACK/NAK history. By
sweeping through different target BLERs, we can find the
throughput optimal BLER offline. This algorithm could be used not
only to optimize throughput but also to enable fair resource
allocation among mobile users in HSDPA. In the online algorithm,
the CQI offset is adapted using an estimated short term
throughput gradient without specifying a target BLER. An
adaptive stepsize mechanism is proposed to track temporal
variation of the environment. We investigate convergence
behavior of both algorithms. Simulation results show that the
proposed offline algorithm can achieve the given target BLER with
good accuracy. Both algorithms yield up to 30% HSDPA
throughput improvement over that with 10% target BLER.
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Core IEEE Projects (Division of Conceptz)
#108,5th Main, 4th Cross, Hanumanth Nagar, Basavanagudi, Bangalore-50, Website: www.coreieeeprojects.com contact: 9535052050
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