Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022998
Xiaohang Chen, A. Benjebbour, Anxin Li, A. Harada
Non-orthogonal multiple access (NOMA) is a promising radio access technique for LTE release 13 and beyond. In this paper, we focus on the investigation of the system performance for uplink NOMA with an advanced successive interference cancellation (SIC) receiver applied in the base station side. In NOMA, more than one user can be multiplexed simultaneously in the same frequency bandwidth, which demands multi-user scheduling. In our study, we propose an enhanced proportional fair (PF) based scheduling scheme for non-orthogonal multiplexed users with contiguous resource allocation to retain the SC-FDM property. In order to reduce the scheduling complexity for non-orthogonal multiple access, a greedy consecutive resource allocation method is adopted. Moreover, since the interference condition becomes more complicated in NOMA, we consider the application of fractional frequency reuse (FFR) to NOMA to further enhance the performance of cell-edge users. In simulation results, the system performance of NOMA by using the proposed PF-based scheduling algorithm is evaluated. The results show that NOMA significantly enhances the uplink system performance compared to the conventional orthogonal multiple access.
{"title":"Multi-User Proportional Fair Scheduling for Uplink Non-Orthogonal Multiple Access (NOMA)","authors":"Xiaohang Chen, A. Benjebbour, Anxin Li, A. Harada","doi":"10.1109/VTCSpring.2014.7022998","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022998","url":null,"abstract":"Non-orthogonal multiple access (NOMA) is a promising radio access technique for LTE release 13 and beyond. In this paper, we focus on the investigation of the system performance for uplink NOMA with an advanced successive interference cancellation (SIC) receiver applied in the base station side. In NOMA, more than one user can be multiplexed simultaneously in the same frequency bandwidth, which demands multi-user scheduling. In our study, we propose an enhanced proportional fair (PF) based scheduling scheme for non-orthogonal multiplexed users with contiguous resource allocation to retain the SC-FDM property. In order to reduce the scheduling complexity for non-orthogonal multiple access, a greedy consecutive resource allocation method is adopted. Moreover, since the interference condition becomes more complicated in NOMA, we consider the application of fractional frequency reuse (FFR) to NOMA to further enhance the performance of cell-edge users. In simulation results, the system performance of NOMA by using the proposed PF-based scheduling algorithm is evaluated. The results show that NOMA significantly enhances the uplink system performance compared to the conventional orthogonal multiple access.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124630394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022869
S. Kucera, Lester T. W. Ho, R. Razavi, H. Claussen
This study examines the trade-offs related to the problem of coverage auto-configuration of open access small cells (SC) that (i) are on-demand deployed in the macro-cells (MC) of a W-CDMA network, and (ii) operate in the same frequency channel as the hosting/neighboring MCs. The goal is to identify stable and practically detectable equilibrium states whose achievement can represent an optimality criterion for implementing automatic coverage adaptation of the SCs. It is shown that, on the downlink (DL), the offloading of MC hotspot users by a nearby SC improves the DL signal-to-interference-and-noise ratio (SINR) and the DL effective throughput of the MC users at the expense of the SC users. Similarly on the uplink (UL), the maximum achievable UL SINR of the SC (MC) users decreases (increases) with a growing SC coverage, but a distinct equilibrium state of the MC-vs-SC trade-off defined on the basis of the spectral radius of a network information matrix can be observed. However, the DL and UL equilibria do not generally coincide unless the MC and SC performance requirements are identical. This fact complicates autonomous optimum partitioning of the SC power budget between data transmissions and coverage-defining pilot signals. Numerical simulations are based on a 3GPP-compliant system model.
{"title":"Coverage Optimization Trade-Offs in Heterogeneous W-CDMA Networks with Co-Channel Small Cells","authors":"S. Kucera, Lester T. W. Ho, R. Razavi, H. Claussen","doi":"10.1109/VTCSpring.2014.7022869","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022869","url":null,"abstract":"This study examines the trade-offs related to the problem of coverage auto-configuration of open access small cells (SC) that (i) are on-demand deployed in the macro-cells (MC) of a W-CDMA network, and (ii) operate in the same frequency channel as the hosting/neighboring MCs. The goal is to identify stable and practically detectable equilibrium states whose achievement can represent an optimality criterion for implementing automatic coverage adaptation of the SCs. It is shown that, on the downlink (DL), the offloading of MC hotspot users by a nearby SC improves the DL signal-to-interference-and-noise ratio (SINR) and the DL effective throughput of the MC users at the expense of the SC users. Similarly on the uplink (UL), the maximum achievable UL SINR of the SC (MC) users decreases (increases) with a growing SC coverage, but a distinct equilibrium state of the MC-vs-SC trade-off defined on the basis of the spectral radius of a network information matrix can be observed. However, the DL and UL equilibria do not generally coincide unless the MC and SC performance requirements are identical. This fact complicates autonomous optimum partitioning of the SC power budget between data transmissions and coverage-defining pilot signals. Numerical simulations are based on a 3GPP-compliant system model.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124632792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022992
Tuyen X. Tran, N. Tran, T. Duong, M. Elkashlan, H. Bahrami
This paper investigates linear precoding designs for a cooperative amplify-and-forward (AF) network with a multi-antenna relay having complete channel state information (CSI). The focus is on both orthogonal AF (OAF) and non-orthogonal AF (NAF) protocols. The precoders at the relay are derived based on the maximum ratio combining (MRC) scheme, followed by an optimal power amplification factor to maximize the end-to-end achievable rate. For OAF, it is a concave optimization problem and the closed-form solution can be obtained using Karush-Kuhn-Tucker (KKT) conditions. However, the optimization problem for NAF is non-convex and getting globally optimal solution in closed-form is more challenging. Our approach is to investigate the achievable rate in different sub-domains of the channel matrix to upper-bound the original problem by a convex optimization problem. It is then shown that the optimal solution to the power amplification factor of the original optimization problem can be obtained in closed-form. The optimal MRC-based relay precoding vector is then established. Numerical results reveal that the proposed system achieves significant end-to-end rate gains over the conventional dual-hop AF multi-antenna as well as cooperative AF single-antenna systems.
{"title":"MRC-Based Relay Precoding for Cooperative AF Multi-Antenna Relay Networks with CSI","authors":"Tuyen X. Tran, N. Tran, T. Duong, M. Elkashlan, H. Bahrami","doi":"10.1109/VTCSpring.2014.7022992","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022992","url":null,"abstract":"This paper investigates linear precoding designs for a cooperative amplify-and-forward (AF) network with a multi-antenna relay having complete channel state information (CSI). The focus is on both orthogonal AF (OAF) and non-orthogonal AF (NAF) protocols. The precoders at the relay are derived based on the maximum ratio combining (MRC) scheme, followed by an optimal power amplification factor to maximize the end-to-end achievable rate. For OAF, it is a concave optimization problem and the closed-form solution can be obtained using Karush-Kuhn-Tucker (KKT) conditions. However, the optimization problem for NAF is non-convex and getting globally optimal solution in closed-form is more challenging. Our approach is to investigate the achievable rate in different sub-domains of the channel matrix to upper-bound the original problem by a convex optimization problem. It is then shown that the optimal solution to the power amplification factor of the original optimization problem can be obtained in closed-form. The optimal MRC-based relay precoding vector is then established. Numerical results reveal that the proposed system achieves significant end-to-end rate gains over the conventional dual-hop AF multi-antenna as well as cooperative AF single-antenna systems.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125028418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022846
A. Davydov, G. Morozov, A. Papathanassiou
In this paper, we address the problem of co-channel interference cancellation and suppression for 3GPP LTE Advanced systems. We propose a blind maximum likelihood (ML) interference suppression receiver relying on direct estimation of the interfering signal parameters, such as transmission scheme, precoding vector, power boosting and modulation. In previous work on ML interference cancellation, that information was assumed to be available at the receiver side. However, the problem of the interfering signal parameter estimation was not addressed. In this paper, we propose a covariance matrix-based estimation algorithm operating directly on the received signal to obtain the desired interference parameters. It is shown by simulation that the accuracy of the proposed estimation scheme is sufficient to facilitate blind operation of the ML receiver in LTE-A networks with performance comparable to the genie-aided ML receiver. This paper first describes the joint ML demodulation scheme for the serving and interfering signals. Then, we discuss how the parameters of the interfering signal can be estimated in LTE-A systems to assist blind ML demodulation. It is finally demonstrated by link level simulation that the proposed blind ML receiver outperforms the conventional linear MMSE-IRC receiver for the investigated cell-edge scenario.
本文探讨了 3GPP LTE Advanced 系统的同信道干扰消除和抑制问题。我们提出了一种盲最大似然（ML）干扰抑制接收器，它依赖于对干扰信号参数（如传输方案、预编码向量、功率提升和调制）的直接估计。在以前的 ML 干扰消除工作中，这些信息被假定为在接收器端可用。然而，干扰信号参数估计的问题并未得到解决。在本文中，我们提出了一种基于协方差矩阵的估计算法，直接对接收信号进行操作，以获得所需的干扰参数。仿真结果表明，所提出的估计方案的精确度足以促进 LTE-A 网络中 ML 接收机的盲操作，其性能可与精灵辅助的 ML 接收机相媲美。本文首先介绍了服务信号和干扰信号的联合 ML 解调方案。然后，我们讨论了如何在 LTE-A 系统中估计干扰信号的参数，以辅助盲 ML 解调。最后通过链路级仿真证明，在所研究的小区边缘场景中，所提出的盲 ML 接收机优于传统的线性 MMSE-IRC 接收机。
{"title":"Blind Maximum Likelihood Interference Cancellation for LTE-Advanced Systems","authors":"A. Davydov, G. Morozov, A. Papathanassiou","doi":"10.1109/VTCSpring.2014.7022846","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022846","url":null,"abstract":"In this paper, we address the problem of co-channel interference cancellation and suppression for 3GPP LTE Advanced systems. We propose a blind maximum likelihood (ML) interference suppression receiver relying on direct estimation of the interfering signal parameters, such as transmission scheme, precoding vector, power boosting and modulation. In previous work on ML interference cancellation, that information was assumed to be available at the receiver side. However, the problem of the interfering signal parameter estimation was not addressed. In this paper, we propose a covariance matrix-based estimation algorithm operating directly on the received signal to obtain the desired interference parameters. It is shown by simulation that the accuracy of the proposed estimation scheme is sufficient to facilitate blind operation of the ML receiver in LTE-A networks with performance comparable to the genie-aided ML receiver. This paper first describes the joint ML demodulation scheme for the serving and interfering signals. Then, we discuss how the parameters of the interfering signal can be estimated in LTE-A systems to assist blind ML demodulation. It is finally demonstrated by link level simulation that the proposed blind ML receiver outperforms the conventional linear MMSE-IRC receiver for the investigated cell-edge scenario.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129797298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022875
T. Fujii, Y. Ohta, H. Omote, Yosuke Sugita
Small cells such as micro and pico cells, whose BS antennas are lower than neighboring buildings, are being installed to suppress co-channel interference. Thus a time spatial propagation (TSP) model that predicts, at the same time, the delay profile and spatial arrival angular profile characteristics of the traveling waves for low- antenna-height BSs, is strongly required. This paper proposes an empirical delay profile prediction formula for low-antenna-height BSs that takes account of BS antenna height, distance from BS and city structure.
{"title":"Delay Profile Model for Low Antenna Height Base Stations in Broadband Mobile Communication","authors":"T. Fujii, Y. Ohta, H. Omote, Yosuke Sugita","doi":"10.1109/VTCSpring.2014.7022875","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022875","url":null,"abstract":"Small cells such as micro and pico cells, whose BS antennas are lower than neighboring buildings, are being installed to suppress co-channel interference. Thus a time spatial propagation (TSP) model that predicts, at the same time, the delay profile and spatial arrival angular profile characteristics of the traveling waves for low- antenna-height BSs, is strongly required. This paper proposes an empirical delay profile prediction formula for low-antenna-height BSs that takes account of BS antenna height, distance from BS and city structure.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128517319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7023173
J. Hou, Qianhong Chen, X. Ren, Siu-Chung Wong, C. Tse
The series/series-parallel (S/SP) compensated contactless resonant converter has a desirable feature of being insensitive to variation of parameters including the transformer's coupling coefficient. However, the error resulting from the use of fundamental harmonic approximation is significant, thus complicating the design procedure and affecting the effectiveness of the control. In this paper a steady-state analysis of the S/SP converter is presented. A generalized equivalent circuit of the S/SP resonant tank is derived, and the cause of the waveform distortion is revealed. Then, more accurate expressions for the key variables of the resonant tank and the output voltage gain are given. Finally, a 1.5 kW contactless resonant converter with S/SP compensation is constructed. Experimental results are in good agreement with the analytical results.
{"title":"Steady-State Analysis of Series/Series-Parallel Compensated Contactless Resonant Converter","authors":"J. Hou, Qianhong Chen, X. Ren, Siu-Chung Wong, C. Tse","doi":"10.1109/VTCSpring.2014.7023173","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023173","url":null,"abstract":"The series/series-parallel (S/SP) compensated contactless resonant converter has a desirable feature of being insensitive to variation of parameters including the transformer's coupling coefficient. However, the error resulting from the use of fundamental harmonic approximation is significant, thus complicating the design procedure and affecting the effectiveness of the control. In this paper a steady-state analysis of the S/SP converter is presented. A generalized equivalent circuit of the S/SP resonant tank is derived, and the cause of the waveform distortion is revealed. Then, more accurate expressions for the key variables of the resonant tank and the output voltage gain are given. Finally, a 1.5 kW contactless resonant converter with S/SP compensation is constructed. Experimental results are in good agreement with the analytical results.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128723458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7023139
E. Rodrigues, F. H. C. Neto, T. Maciel, F. Lima, F. Cavalcanti
In order to expand its market share and decrease churn, cellular network operators want to achieve the maximum possible number of satisfied clients. In this paper, we propose to solve the problem of user satisfaction maximization using an utility- based dynamic resource assignment algorithm that uses a sigmoidal utility function combined with either Orthogonal Random Beamforming (ORB) or Fixed Switching Beamforming (FSB). System-level evaluations of the downlink of an Orthogonal Frequency Division Multiple Access (OFDMA) system with real-time services demonstrate that there is an optimal number of spatial beams to be used by ORB and FSB, that FSB outperforms ORB with lower complexity, and also that the proposed joint resource assignment and beamforming outperforms other classical techniques found in the literature.
{"title":"Utility-Based Resource Allocation with Spatial Multiplexing for Real Time Services in Multi-User OFDM Systems","authors":"E. Rodrigues, F. H. C. Neto, T. Maciel, F. Lima, F. Cavalcanti","doi":"10.1109/VTCSpring.2014.7023139","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023139","url":null,"abstract":"In order to expand its market share and decrease churn, cellular network operators want to achieve the maximum possible number of satisfied clients. In this paper, we propose to solve the problem of user satisfaction maximization using an utility- based dynamic resource assignment algorithm that uses a sigmoidal utility function combined with either Orthogonal Random Beamforming (ORB) or Fixed Switching Beamforming (FSB). System-level evaluations of the downlink of an Orthogonal Frequency Division Multiple Access (OFDMA) system with real-time services demonstrate that there is an optimal number of spatial beams to be used by ORB and FSB, that FSB outperforms ORB with lower complexity, and also that the proposed joint resource assignment and beamforming outperforms other classical techniques found in the literature.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129376782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022825
C. Zheng, Guoqing Xu, Sukwon Cha
Traffic preview information is helpful when constructing energy management strategies for hybrid vehicles. In this paper, an optimal control theory-based energy management strategy for fuel cell hybrid vehicles is proposed, which optimizes the vehicle's velocity profile when minimizing the fuel consumption based on the traffic preview information. The control problem is formulated and the proposed energy management strategy is applied to a fuel cell hybrid vehicle in a computer simulation environment. Simulation results show that the fuel economy is improved by the proposed energy management strategy compared to the case where the vehicle velocity is not optimized.
{"title":"An Intelligent Energy Management Strategy of Hybrid Vehicles Based on Traffic Preview Information","authors":"C. Zheng, Guoqing Xu, Sukwon Cha","doi":"10.1109/VTCSpring.2014.7022825","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022825","url":null,"abstract":"Traffic preview information is helpful when constructing energy management strategies for hybrid vehicles. In this paper, an optimal control theory-based energy management strategy for fuel cell hybrid vehicles is proposed, which optimizes the vehicle's velocity profile when minimizing the fuel consumption based on the traffic preview information. The control problem is formulated and the proposed energy management strategy is applied to a fuel cell hybrid vehicle in a computer simulation environment. Simulation results show that the fuel economy is improved by the proposed energy management strategy compared to the case where the vehicle velocity is not optimized.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127433618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7022824
Huan Sun, Jiayi Zhang, Wei Wang
Coherent joint transmission (CJT) algorithm has been extensively investigated in multi-cell cooperative downlink transmission due to its huge potential performance gains. Comparing with the existing CJT algorithm based on the multi-user eign-mode transmission, an enhanced CJT (eCJT) algorithm is proposed in this paper to further enhance the performance of cellular network in terms of spectral efficiency, especially for the cell edge users. Theoretical analysis show that utilizing successive transmit channel optimization and selection, eCJT outperforms traditional CJT in multi-cell coordinated joint transmission. System level simulation results demonstrate that eCJT algorithm outperforms traditional CJT algorithm in both cell average performance and cell edge performance. Taking the performance of traditional CJT algorithm as the baseline, eCJT algorithm can achieve over 30% spectral efficiency gain in cell edge under ITU UMi and 3GPP Case1-3D scenario, respectively.
{"title":"An Enhanced Coherent Joint Transmission Algorithm for Multi-Cell Downlink Transmission","authors":"Huan Sun, Jiayi Zhang, Wei Wang","doi":"10.1109/VTCSpring.2014.7022824","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7022824","url":null,"abstract":"Coherent joint transmission (CJT) algorithm has been extensively investigated in multi-cell cooperative downlink transmission due to its huge potential performance gains. Comparing with the existing CJT algorithm based on the multi-user eign-mode transmission, an enhanced CJT (eCJT) algorithm is proposed in this paper to further enhance the performance of cellular network in terms of spectral efficiency, especially for the cell edge users. Theoretical analysis show that utilizing successive transmit channel optimization and selection, eCJT outperforms traditional CJT in multi-cell coordinated joint transmission. System level simulation results demonstrate that eCJT algorithm outperforms traditional CJT algorithm in both cell average performance and cell edge performance. Taking the performance of traditional CJT algorithm as the baseline, eCJT algorithm can achieve over 30% spectral efficiency gain in cell edge under ITU UMi and 3GPP Case1-3D scenario, respectively.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130007165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-05-18DOI: 10.1109/VTCSpring.2014.7023064
Ren-Huang Liou, Christoph Ide, Bjoern Dusza, C. Wietfeld, Yi-Bing Lin
In Long Term Evolution (LTE), Voice over Internet Protocol (VoIP) is used for the delivery of the voice data. One of the major challenges for VoIP over LTE is to guarantee the Quality of Experience (QoE) of the VoIP calls. This paper uses an LTE base station emulator and a radio channel emulator to evaluate the impacts of different User Equipment (UE) velocities and Radio Link Control (RLC) parameter values on the QoE of the calls in the vehicular environment. Our study shows that LTE can provide acceptable VoIP quality in the high-speed scenarios (e.g., high-speed train). This paper provides the guidelines for the telecommunications operators to select the appropriate parameter values when deploying their VoIP services in LTE.
在LTE (Long Term Evolution)技术中，语音数据的传输采用VoIP (Voice over Internet Protocol)技术。如何保证VoIP通话的体验质量(Quality of Experience, QoE)是LTE网络通信面临的主要挑战之一。本文利用LTE基站仿真器和无线电信道仿真器，对车载环境下不同用户设备(UE)速度和无线电链路控制(RLC)参数值对呼叫QoE的影响进行了评估。我们的研究表明，LTE可以在高速场景(例如高速列车)中提供可接受的VoIP质量。本文为电信运营商在LTE中部署VoIP业务时选择合适的参数值提供了指导。
{"title":"QoE-Aware LTE Radio Link Control Parameters for Voice over IP in Vehicular Environments","authors":"Ren-Huang Liou, Christoph Ide, Bjoern Dusza, C. Wietfeld, Yi-Bing Lin","doi":"10.1109/VTCSpring.2014.7023064","DOIUrl":"https://doi.org/10.1109/VTCSpring.2014.7023064","url":null,"abstract":"In Long Term Evolution (LTE), Voice over Internet Protocol (VoIP) is used for the delivery of the voice data. One of the major challenges for VoIP over LTE is to guarantee the Quality of Experience (QoE) of the VoIP calls. This paper uses an LTE base station emulator and a radio channel emulator to evaluate the impacts of different User Equipment (UE) velocities and Radio Link Control (RLC) parameter values on the QoE of the calls in the vehicular environment. Our study shows that LTE can provide acceptable VoIP quality in the high-speed scenarios (e.g., high-speed train). This paper provides the guidelines for the telecommunications operators to select the appropriate parameter values when deploying their VoIP services in LTE.","PeriodicalId":405517,"journal":{"name":"2014 IEEE 79th Vehicular Technology Conference (VTC Spring)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122358631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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