The Experts below are selected from a list of 3279 Experts worldwide ranked by ideXlab platform
Markus Rupp - One of the best experts on this subject based on the ideXlab platform.
-
Latency and Resource Utilization Analysis for V2X Communication over LTE MBSFN Transmission
arXiv: Information Theory, 2015Co-Authors: Illia Safiulin, Stefan Schwarz, Tal Philosof, Markus RuppAbstract:In this paper, we investigate the performance of LTE Multicast-Broadcast Single-Frequency Networks (MBSFN). LTE-MBSFN is viewed as one of the most promising candidates for vehicular communications which can enhance reliability of vehicular application traffic. This is achieved due to the possibility to efficiently support message exchange in-between vehicles by multicasting information to several vehicles in parallel (point-to-Multipoint Transmission) employing an Multimedia Broadcast/Multicast Service (MBMS). We investigate two metrics to gauge the performance of MBMS/MBSFN Transmissions in comparison with standard unicast Transmissions for vehicular communications: latency of packet delivery and overhead caused by vehicular traffic, i.e., network utilization. Additionally, we present technique of prediction of system behaviour and explore the influence of Transmission bandwidth and Transmission rate on mentioned metrics.
-
runtime precoding enabling Multipoint Transmission in lte advanced system level simulations
IEEE Access, 2015Co-Authors: Martin Taranetz, Thomas Blazek, Thomas Kropfreiter, Martin Klaus Muller, Stefan Schwarz, Markus RuppAbstract:System-level simulations have become an indispensable tool for predicting the behavior of wireless cellular systems. As exact link-level modeling is unfeasible due to its huge complexity, mathematical abstraction is required to obtain equivalent results by less complexity. A particular problem in such approaches is the modeling of multiple coherent Transmissions. Those arise in multiple-input-multiple-output Transmissions at every base station but nowadays so-called coordinated Multipoint (CoMP) techniques have become very popular, allowing to allocate two or more spatially separated Transmission points. Also, multimedia broadcast single frequency networks (MBSFNs) have been introduced recently in long-term evolution (LTE), which enables efficient broadcasting Transmission suitable for spreading information that has a high user demand as well as simultaneously sending updates to a large number of devices. This paper introduces the concept of runtime-precoding, which allows to accurately abstract many coherent Transmission schemes while keeping additional complexity at a minimum. We explain its implementation and advantages. For validation, we incorporate the runtime-precoding functionality into the Vienna LTE-A downlink system-level simulator, which is an open source tool, freely available under an academic noncommercial use license. We measure simulation run times and compare them against the legacy approach as well as link-level simulations. Furthermore, we present multiple application examples in the context of intrasite and intersite CoMP for train communications and MBSFN.
-
Transmit Optimization for the MISO Multicast Interference Channel
IEEE Transactions on Communications, 2015Co-Authors: Stefan Schwarz, Markus RuppAbstract:In this paper, we consider multiple-input single-output (MISO) physical layer multicasting, where several multiantenna transmitters each simultaneously multicast a common message to a distinct set of single-antenna receivers, causing interference between different multicast messages. To optimize the achievable rate of this MISO multicast interference channel, we propose iterative distributed transmit optimization algorithms that are based on interference leakage control, requiring local channel state information at each transmitter and leakage information exchange among transmitters. We, furthermore, propose extensions of existing coordinated Multipoint Transmission schemes that have been developed for unicast interference channels, such as signal to leakage and noise ratio beamforming, to the considered multicast system. Such methods are of importance, e.g., for future releases of LTE that will support multiantenna multicasting using MBMS/MBSFN. Numerical simulations confirm the potential of the proposed distributed transmit optimization algorithm.
Mamoru Sawahashi - One of the best experts on this subject based on the ideXlab platform.
-
coordinated Multipoint Transmission reception techniques for lte advanced coordinated and distributed mimo
IEEE Wireless Communications, 2010Co-Authors: Mamoru Sawahashi, Akihito Morimoto, Yoshihisa Kishiyama, Daisuke Nishikawa, Motohiro TannoAbstract:This article presents an elaborate coordination technique among multiple cell sites called coordinated Multipoint Transmission and reception in the Third Generation Partnership Project for LTE-Advanced. After addressing major radio access techniques in the LTE Release 8 specifications, system requirements and applied radio access techniques that satisfy the requirements for LTE-Advanced are described including CoMP Transmission and reception. Then CoMP Transmission and reception schemes and the related radio interface, which were agreed upon or are currently being discussed in the 3GPP, are presented. Finally, system-level simulation evaluations show that the CoMP Transmission and reception schemes have a significant effect in terms of improving the cell edge user throughput based on LTE-Advanced simulation conditions.
-
VTC Spring - Investigation on Optimum Radio Link Connection Using Remote Radio Equipment in Heterogeneous Network for LTE-Advanced
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009Co-Authors: Akihito Morimoto, Kenichi Higuchi, Yoshihisa Kishiyama, Motohiro Tanno, Mamoru SawahashiAbstract:This paper proposes the optimum radio link connection (RLC) using remote radio equipment (RRE) in a heterogeneous network in which various types of cell configurations exist with different cell sizes and downlink Transmission power levels for LTE (Long-Term Evolution)-Advanced. The instantaneous received signal-to-interference plus noise power ratio (SINR) and the user throughput performance employing the proposed RLC methods are investigated using system-level simulations. From the simulation results, we show that the proposed independent RLC method between the downlink and uplink and the proposed Multipoint RLC method based on coordinated Multipoint Transmission/reception achieve a higher user throughput both in the downlink and uplink compared to the conventional common RLC method. Therefore, the proposed independent and Multipoint RLC methods are very promising candidates to improve the user throughput particularly near the cell edge in a heterogeneous network for LTE-Advanced.
Stefan Schwarz - One of the best experts on this subject based on the ideXlab platform.
-
Latency and Resource Utilization Analysis for V2X Communication over LTE MBSFN Transmission
arXiv: Information Theory, 2015Co-Authors: Illia Safiulin, Stefan Schwarz, Tal Philosof, Markus RuppAbstract:In this paper, we investigate the performance of LTE Multicast-Broadcast Single-Frequency Networks (MBSFN). LTE-MBSFN is viewed as one of the most promising candidates for vehicular communications which can enhance reliability of vehicular application traffic. This is achieved due to the possibility to efficiently support message exchange in-between vehicles by multicasting information to several vehicles in parallel (point-to-Multipoint Transmission) employing an Multimedia Broadcast/Multicast Service (MBMS). We investigate two metrics to gauge the performance of MBMS/MBSFN Transmissions in comparison with standard unicast Transmissions for vehicular communications: latency of packet delivery and overhead caused by vehicular traffic, i.e., network utilization. Additionally, we present technique of prediction of system behaviour and explore the influence of Transmission bandwidth and Transmission rate on mentioned metrics.
-
runtime precoding enabling Multipoint Transmission in lte advanced system level simulations
IEEE Access, 2015Co-Authors: Martin Taranetz, Thomas Blazek, Thomas Kropfreiter, Martin Klaus Muller, Stefan Schwarz, Markus RuppAbstract:System-level simulations have become an indispensable tool for predicting the behavior of wireless cellular systems. As exact link-level modeling is unfeasible due to its huge complexity, mathematical abstraction is required to obtain equivalent results by less complexity. A particular problem in such approaches is the modeling of multiple coherent Transmissions. Those arise in multiple-input-multiple-output Transmissions at every base station but nowadays so-called coordinated Multipoint (CoMP) techniques have become very popular, allowing to allocate two or more spatially separated Transmission points. Also, multimedia broadcast single frequency networks (MBSFNs) have been introduced recently in long-term evolution (LTE), which enables efficient broadcasting Transmission suitable for spreading information that has a high user demand as well as simultaneously sending updates to a large number of devices. This paper introduces the concept of runtime-precoding, which allows to accurately abstract many coherent Transmission schemes while keeping additional complexity at a minimum. We explain its implementation and advantages. For validation, we incorporate the runtime-precoding functionality into the Vienna LTE-A downlink system-level simulator, which is an open source tool, freely available under an academic noncommercial use license. We measure simulation run times and compare them against the legacy approach as well as link-level simulations. Furthermore, we present multiple application examples in the context of intrasite and intersite CoMP for train communications and MBSFN.
-
Transmit Optimization for the MISO Multicast Interference Channel
IEEE Transactions on Communications, 2015Co-Authors: Stefan Schwarz, Markus RuppAbstract:In this paper, we consider multiple-input single-output (MISO) physical layer multicasting, where several multiantenna transmitters each simultaneously multicast a common message to a distinct set of single-antenna receivers, causing interference between different multicast messages. To optimize the achievable rate of this MISO multicast interference channel, we propose iterative distributed transmit optimization algorithms that are based on interference leakage control, requiring local channel state information at each transmitter and leakage information exchange among transmitters. We, furthermore, propose extensions of existing coordinated Multipoint Transmission schemes that have been developed for unicast interference channels, such as signal to leakage and noise ratio beamforming, to the considered multicast system. Such methods are of importance, e.g., for future releases of LTE that will support multiantenna multicasting using MBMS/MBSFN. Numerical simulations confirm the potential of the proposed distributed transmit optimization algorithm.
Motohiro Tanno - One of the best experts on this subject based on the ideXlab platform.
-
coordinated Multipoint Transmission reception techniques for lte advanced coordinated and distributed mimo
IEEE Wireless Communications, 2010Co-Authors: Mamoru Sawahashi, Akihito Morimoto, Yoshihisa Kishiyama, Daisuke Nishikawa, Motohiro TannoAbstract:This article presents an elaborate coordination technique among multiple cell sites called coordinated Multipoint Transmission and reception in the Third Generation Partnership Project for LTE-Advanced. After addressing major radio access techniques in the LTE Release 8 specifications, system requirements and applied radio access techniques that satisfy the requirements for LTE-Advanced are described including CoMP Transmission and reception. Then CoMP Transmission and reception schemes and the related radio interface, which were agreed upon or are currently being discussed in the 3GPP, are presented. Finally, system-level simulation evaluations show that the CoMP Transmission and reception schemes have a significant effect in terms of improving the cell edge user throughput based on LTE-Advanced simulation conditions.
-
VTC Spring - Investigation on Optimum Radio Link Connection Using Remote Radio Equipment in Heterogeneous Network for LTE-Advanced
VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, 2009Co-Authors: Akihito Morimoto, Kenichi Higuchi, Yoshihisa Kishiyama, Motohiro Tanno, Mamoru SawahashiAbstract:This paper proposes the optimum radio link connection (RLC) using remote radio equipment (RRE) in a heterogeneous network in which various types of cell configurations exist with different cell sizes and downlink Transmission power levels for LTE (Long-Term Evolution)-Advanced. The instantaneous received signal-to-interference plus noise power ratio (SINR) and the user throughput performance employing the proposed RLC methods are investigated using system-level simulations. From the simulation results, we show that the proposed independent RLC method between the downlink and uplink and the proposed Multipoint RLC method based on coordinated Multipoint Transmission/reception achieve a higher user throughput both in the downlink and uplink compared to the conventional common RLC method. Therefore, the proposed independent and Multipoint RLC methods are very promising candidates to improve the user throughput particularly near the cell edge in a heterogeneous network for LTE-Advanced.
Zhiquan Luo - One of the best experts on this subject based on the ideXlab platform.
-
long term transmit point association for coordinated Multipoint Transmission by stochastic optimization
International Workshop on Signal Processing Advances in Wireless Communications, 2013Co-Authors: Ruoyu Sun, Hadi Baligh, Zhiquan LuoAbstract:We consider the problem of long-term transmit point (TP) association in a heterogeneous network where CoMP (Coordinated Multiple Point) Transmission scheme is supported. More specifically, the TP association is designed for a relatively long time period where only channel statistics is available, and each user equipment(UE) could be associated with a number of TPs. We formulate the problem as a two-stage stochastic optimization problem with l1-norm regularization, and propose a stochastic sparse WMMSE (SS-WMMSE) algorithm to solve it. The simulation results show that the proposed algorithm significantly outperforms the traditional deterministic approach.
-
SPAWC - Long-term transmit point association for coordinated Multipoint Transmission by stochastic optimization
2013 IEEE 14th Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2013Co-Authors: Ruoyu Sun, Hadi Baligh, Zhiquan LuoAbstract:We consider the problem of long-term transmit point (TP) association in a heterogeneous network where CoMP (Coordinated Multiple Point) Transmission scheme is supported. More specifically, the TP association is designed for a relatively long time period where only channel statistics is available, and each user equipment(UE) could be associated with a number of TPs. We formulate the problem as a two-stage stochastic optimization problem with l1-norm regularization, and propose a stochastic sparse WMMSE (SS-WMMSE) algorithm to solve it. The simulation results show that the proposed algorithm significantly outperforms the traditional deterministic approach.
