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interference management for rate-constrained moving relay node in a heterogeneous network

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Science China(Information Sciences) 2014年第10期57卷 34-45页

作者： HUANG Sheng LI JianDong ZHAO LinJing HUANG JinJing Broadband Wireless Communications Laboratory Information Science InstituteState Key Laboratory of ISN Xidian University

Cooperative communication via a moving relay node(MRN) helps resolve both the poor quality of service(QoS) and limited battery-capacity problems of cell-edge vehicle user equipment(VUE). This paper investigates the performance of MRNs in a heterogeneous network(HetNet). MRNs as well as other small cells are expected to coexist in a complex manner. In such a HetNet, the inter-cell interference may degrade the expected improvement of MRNs, especially at the cell-edge. In this paper, we investigate the impact of intercell interference on the performance of MRNs. To alleviate this impact, we first formulated a general optimization problem for which it is intractable to find a global optimal solution. To have a practical solution with low computational complexity, we used a practical interference management algorithm that aimed to ensure that every MRN achieved its required minimum-rate while maximizing total network throughput. In the simulations, the proposed algorithm was observed to improve both the QoS and fairness of MRNs. Numerical results demonstrate that the proposed algorithm can offer an efficient trade-off between the performance of both the victim MRNs and aggressing femtocells.

关键词： moving relay node minimum-rate constraint heterogeneous network inter-cell interference sub-channel allocation interference mitigation

Research on uplink coordinated transmission schemes in LTE-advanced systems

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The Journal of China Universities of Posts and Telecommunications 2011年第2期18卷 72-77页

作者： WANG Ya-feng WEI Guo-xing YANG Da-cheng WEI Xiang School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China Faculty of Engineering and Surveying University of Southern Queensland Toowoomba QLD 4350 Australia

The investigation of inter-cell interference mitigation techniques is a key area in wireless communications.Coordinated multiple points（CoMP） transmission/reception is a candidate technique for interference cancellation in 3GPP LTE-Advanced system.However,the coordination scheme in CoMP remains a key research problem to be solved,which will have a strong influence on the performance of CoMP.In this paper,a novel coordinated transmission scheme is proposed for the uplink LTE-Advanced system.In our scheme,several base transceiver stations（BTS） and users are selected as coordination partners which form a CoMP cluster.Joint processing is used at the receiver to mitigate interference.From the perspective of coordinated partner selection,our scheme can be divided into static and dynamic coordination which are both considered to fully exploit the throughput gain of CoMP.The proposed schemes are evaluated by system level simulation and compared with the conventional LTE system based upon single cell processing.Our simulation results demonstrate that the proposed schemes attain superior performance as opposed to the conventional system in terms of cell average and cell edge throughput.

关键词： CoMP joint processing inter-cell interference static coordination dynamic coordination

Multi-beam cooperative frequency reuse for coordinated multi-point transmission

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 11-18页

作者： LI Jing-ya XU XiaoTdong ZHANG Hui TAO Xiao-feng Tommy Svensson Carmen Botella CHEN Xin Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Signals and Systems Chahners University of Technology SE-412-96 Gothenburg Sweden

Coordinated multi-point （CoMP） joint transmission is considered in the 3rd generation partnership project （3GPP） long term evolution （LTE）-advanced as a key technique to mitigate inter-cell interference and improve the cell-edge performance. To effectively apply CoMP joint transmission,efficient frequency reuse schemes need to be designed to support resource management cooperation among coordinated cells. However,most of the existing frequency reuse schemes are not suitable for CoMP systems due to not considering multi-point joint transmission scenarios in their frequency reuse rules. In addition,the restrictions of frequency resources in those schemes result in a high blocking probability. To solve the above two problems,a multi-beam cooperative frequency reuse （MBCFR） scheme is proposed in this paper,which reuses all the available frequency resources in each sector and supports multi-beam joint transmission for cell-edge users. Besides,the blocking probability is proved to be efficiently reduced. Moreover,a frequency-segment-sequence based MBCFR scheme is introduced to further reduce the inter-cell interference. System level simulations demonstrate that the proposed scheme results in higher cell-edge average throughput and cell-average throughput with lower blocking probability.

关键词： frequency reuse inter-cell interference coordinated multi-point transmission LTE-advanced

Joint resource allocation with QoS provisioning in K-tier heterogeneous cellular networks

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The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 15-20页

作者： WANG Yong-bin ZHANG He-li LI Yi JI Hong School of Telecommunication Engineering Beijing University of Posts and Telecommunications

In this paper, the joint resource allocation （RA） problem with quality of service （QoS） provisioning in downlink heterogeneous cellular networks （HCN） is studied. To fully exploit the network capacity, the HCN is modeled as a K-tier cellular network where each tier＇s base stations （BSs） have different properties. However, deploying numbers of low power nodes （LPNs） which share the same frequency band with macrocell generates severe inter-cell interference. Enhancement of system capacity is restricted for inter-cell interference. Therefore, a feasible RA scheme has to be developed to fully exploit the resource efficiency. Under the constraint of inter-cell interference, we formulate the RA problem as a mixed integer programming problem. To solve the optimization problem we develop a two-stage solution. An integer subchannel assignment algorithm and Lagrangian-based power allocation algorithm are designed. In addition, the biasing factor is also considered and the caused influence on system capacity is evaluated. Simulation results show that the proposed algorithms achieve a good tradeoff between network capacity and interference. Moreover, the average network efficiency is highly improved and the outage probability is also decreased.

关键词： heterogeneous cellular networks joint RA inter-cell interference cell range expansion

An Enhanced IRC Algorithm for LTE Downlink Receiver in Multi-cell Environment

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Chinese Journal of Electronics 2014年第2期23卷 377-381页

作者： YAN Zhiting HE Guanghui MA Jun School of Microelectronics Shanghai Jiao Tong University

This paper proposes an enhanced interference rejection combining(IRC) algorithm for Long term evolution(LTE) downlink receiver in multi-cell communication systems. In this algorithm, a proper Multiple input multiple output(MIMO) receive method is adopted according to Generalized likelihood ratio test(GLRT) intercell interference detection. Iteration between channel estimation and data detection is carried out to improve the performance of IRC algorithm. Simulation results show that this proposed algorithm can effectively detect intercell interference and improve Block error rate(BLER)performance and channel estimation Mean squared error(MSE) compared to non-iterative IRC algorithm, making it suitable for LTE downlink receiver in multi-cell cellular systems.

关键词： Long term evolution(LTE) inter-cell interference interference rejection combing(IRC) Generalized likelihood ratio test(GLRT)

Power allocation scheme for multicell interference coordination in OFDMA systems

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Frontiers of Electrical and Electronic Engineering in China 2009年第1期4卷 31-34页

作者： Zhiwei LI Chunyan FENG Tiankui ZHANG Jieying ZHENG Institute of Communication Networks Integrated Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

To coordinate inter-cell interference,a multicell adaptive power allocation scheme is proposed for downlink orthogonal frequency division multiple access(OFDMA)cellular systems.This scheme uses the difference of the signal to interference plus noise ratio(SINR)between the co-subchannels of adjacent cells to balance SINR for coordinating the transmit power in the co-subchannels.The scheme can improve edge user performance,reduce interference between the co-subchannels of adjacent cells and improve radio resource utility.Simulation results show that the scheme can balance system performance and ensure system throughput.

关键词： orthogonal frequency division multiple access(OFDMA) power allocation inter-cell interference interference coordination

Uplink Power Control for MIMO-OFDMA cellular Systems

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ZTE Communications 2011年第4期9卷 55-62,67页

作者： Rongzhen Yang Hujun Yin Intel China Corp. Shanghai 200241 P.R. China Intel Corp. 2200 Mission College Blvd CA 95054-1549 U.S.A

In this paper, we propose a novel uplink power control algorithm, SMST, for multiple-input multiple-output orthogonal frequency-division multiple access （MIMQ-OFDMA）.We perform an extensive system-level simulation to compare different uplink power control algorithms, including the FPC adopted in 3GPP LTE and LTE-Advanced. Simulations show that SMST adopted in IEEE 802.16m outperforms other algorithms in terms of spectral efficiency, cell-edge performance, interference control, and trade-off control between sector-accumulated throughput and cell-edge user throughput. The SMST performance gain over FPC can be more than 40%

关键词： uplink power control inter-cell interference OFDMA MIMO

Semi-Blind Hebb-PPIC Multiuser Detection Algorithm

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Semi-Blind Hebb-PPIC Multiuser Detection Algorithm