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Search: WFRF:(Rami L) > Conference paper

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  • Dargie, W., et al. (author)
  • A Topology Control Protocol for 2D Poisson Distributed Wireless Sensor Networks
  • 2009
  • Conference paper (peer-reviewed)abstract
    • Topology control in a wireless sensor network is useful for ensuring that the network remains connected in the presence of nodes that exhaust their energy or become altogether dysfunctional (for whatever reasons). It also ensures that all the link that can be established are energy-efficient links and the nodes utilize their energy fairly. In this paper, we propose a fair and energy efficient topology control protocol for a two-dimensional random sensor deployment in which the nodes can estimate the distances to their neighbors and vary their transmission power accordingly. The protocol applies a neighbor eligibility metric in order to ensure a fair distribution of energy in the network. We introduce the notion of weighted relaying regions defined over the plane of a searching node to drop out inefficient links. Unlike most topology control protocols that rely on nearest neighbor approaches, we use a distance measure that is radio characteristic and channel condition dependent. We verify the performance of the protocol through simulation results on network graph properties and energy consumption.
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2.
  • Kurras, M., et al. (author)
  • From Single- to Multi-User Scheduling in LTE-A Uplink Exploiting Virtual MIMO
  • 2012
  • In: 2012 CONFERENCE RECORD OF THE FORTY SIXTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS (ASILOMAR). - : IEEE conference proceedings. ; , s. 1172-1176
  • Conference paper (peer-reviewed)abstract
    • This paper focuses on frequency and spatial domain scheduling in a frequency division duplex (FDD) Long Term Evolution - Advanced (LTE-A) system for the uplink direction. First we present a single-user (SU) channel-dependent scheduling (CDS) algorithm for continuous bandwidth allocation. There, we introduce a parameter to adjust the distribution of the user throughput without any loss in system performance. This is done as a preparation for the main contribution of this paper where we take advantage of the fact that a base station (BS) in LTE-A will be equipped with two ore more receive antennas by exploiting virtual multiple-input multiple-output (MIMO) through multi-user (MU) scheduling. We take the output of the SU-algorithm and group additional user in a second spatial layer to increase the system throughput. Note that our proposed MU algorithm requires a SU scheduler considering the continuous bandwidth constraint for assigned resources per user, because we do not change scheduling decisions made by the SU algorithm. The evaluation in this paper is done by extensive system level simulations in a third generation partnership project (3GPP) conform multi-cell scenario, assuming both SU and full MU interference. Numerical results show that our MU-algorithm improves the system throughput by 25-50 % compared to SU scheduling in uplink.
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  • Result 1-2 of 2
Type of publication
Type of content
peer-reviewed (2)
Author/Editor
Mochaourab, Rami (2)
Guan, L. (1)
Thiele, L. (1)
Kurras, M. (1)
Dargie, W. (1)
Schill, A. (1)
University
Royal Institute of Technology (2)
RISE (2)
Language
English (2)
Research subject (UKÄ/SCB)
Engineering and Technology (2)

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