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Institute of Communication Networks and Computer Engineering (IKR)
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IKR Publication No 36428 |
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Publication No 36428
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Author(s)
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Necker, M.C.*; Weber, A.
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Title
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Parameter Selection for HSDPA Iub Flow Control
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Methods
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Performance Evaluation; Traffic Engineering; Network Planning
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Keywords
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CELLULAR SYSTEM; DELAY DISTRIBUTION; UMTS; FLOW CONTROL
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Abstract
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The recently emerging High Speed Downlink Packet Access (HSDPA) enhances conventional WCDMA systems according to the UMTS standard with data rates of up to 14MBit/s in the downlink direction. This is achieved by using adaptive modulation and coding as well as a fast Hybrid Automatic Repeat Request (HARQ) mechanism. This functionality is implemented close to the air interface in the Node B. In addition to the data buffer in the RNC, this requires a second data buffer in the Node B. Consequently, a flow control mechanism is needed which controls the amount of data to be transmitted from the RNC's buffer to the Node B's buffer. The spatial separation of RNC and Node B imposes significant signaling constraints and control dead time limitations to the flow control mechanism. Additionally, due to the time-varying nature of the radio channel, the data rate towards a particular user may be highly variable. In this paper, we study the impact of the flow control on system performance. In particular, we consider the parameter choice for a previously presented algorithm and highlight some inherent tradeoffs.
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Year
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2005
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Reference entry
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Necker, M.C.; Weber, A.
Parameter Selection for HSDPA Iub Flow Control
Proceedings of the 2nd International Symposium on Wireless Communication Systems, Siena, September 2005
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BibTex file
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Full Text
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Authors marked with an asterisk (*) were IKR staff members at the time the publication has been written.
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