LTE-A协作多点传输技术研究与仿真
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摘要
公共移动通信网络基于小区制蜂窝组网,通过划分蜂窝小区实现了频谱的复用,极大提高了频谱的利用率。但是蜂窝网络的小区边缘往往毗邻了多个小区,位于这些边缘地带的用户设备不仅接收到的所属小区的信号弱,而且往往受到毗邻小区的信号干扰,从而导致了蜂窝边缘接收信号的信干噪比低,网络覆盖差。
作为LTE-A物理层关键技术,协作多点传输(Coordinated Multi-Point Transmission and Reception, CoMP)则是通过在多个毗邻小区之间引入协作传输机制来降低或消除信号之间的相互干扰,从而提升边缘用户的吞吐量和系统的整体吞吐量。
本文研究的重点是适用于实际网络场景下的具体可行的协作多点传输技术的策略方法。主要的研究成果如下：
一、分析总结了3GPP文档和学术文献中协作多点传输技术的基本内容以及研究现状,对协作多点传输技术以及协作节点选择技术和协作资源分配技术进行了高度抽象概括,提出具有一定通用性的协作多点传输技术的流程框架。
二、搭建了完备的LTE-A CoMP仿真平台,设计并实现了协作用户判断模块,协作节点选择模块,协作资源分配模块以及联合处理功能。仿真平台基于面向对象技术,具有良好的通用性和扩展性,仿真结果与3GPP文档大体一致。
三、提出了动态协作资源分配策略和多目标协作节点选择策略,以及保证业务质量的自适应协作多点传输方法。由仿真结果可知,所提出的策略和方法均有效提升了系统的边缘频谱效率和平均频谱效率,而且不会带来太大的复杂度和信令开销。
The introduction of the concept of cellular work in the Public Land Mobile network has greatly improved the spectral efficiency by reusing the frequency resource in different cells. But the edge of a certain cell is located between its neighboring cells, thus the UEs(user equipment) in the area will not only receive weak signal from its serving cell, but also suffer from great interference from its neighboring cells, which will result in low SINR(signal-to-interference and noise-ratio) and small cover range of the network.
As a key physical aspect technology in LTE-A(Long Term Evolution-Advance), CoMP(Coordinated Multi-Point Transmission and Reception) is adopted to improve both the edge UEs'throughput and the average throughput of the cell, in the way of introducing the cooperation transmission to reduce or even mitigate the co-channel interference.
This thesis was focused on study CoMP schemes which were feasible on the real network scenarios. The key achievements can be summarized as follows:
Ⅰ. Described the basic content and research background from a lot of academic literatures and 3GPP (The 3rd Generation Partnership Project) documents, analyzed the existing achievement in CoMP. Promoted frames of CoMP, mainly on the cell selection and resource allocation.
Ⅱ. Implemented up a simulation platform for LTE-A CoMP, designed and built the edge-user determine module, the cooperating cells selection module, the cooperating resource allocation module and the joint processing function. The simulation platform is based on object-oriented programming, with good applicability and extensible. The result of the simulation platform is equal with 3 GPP Technology Report.
Ⅲ. Proposed a dynamic cooperating resource allocation scheme and a multi-objective cooperating cells selection scheme, and an adaptive multi-point transmission method which could ensure the quality of service. The simulation results showed that all the proposed schemes and method improve the average spectral efficiency and cell-edge UEs' spectral efficiency with limited complexity and less signaling overhead.
作为LTE-A物理层关键技术,协作多点传输(Coordinated Multi-Point Transmission and Reception, CoMP)则是通过在多个毗邻小区之间引入协作传输机制来降低或消除信号之间的相互干扰,从而提升边缘用户的吞吐量和系统的整体吞吐量。
本文研究的重点是适用于实际网络场景下的具体可行的协作多点传输技术的策略方法。主要的研究成果如下：
一、分析总结了3GPP文档和学术文献中协作多点传输技术的基本内容以及研究现状,对协作多点传输技术以及协作节点选择技术和协作资源分配技术进行了高度抽象概括,提出具有一定通用性的协作多点传输技术的流程框架。
二、搭建了完备的LTE-A CoMP仿真平台,设计并实现了协作用户判断模块,协作节点选择模块,协作资源分配模块以及联合处理功能。仿真平台基于面向对象技术,具有良好的通用性和扩展性,仿真结果与3GPP文档大体一致。
三、提出了动态协作资源分配策略和多目标协作节点选择策略,以及保证业务质量的自适应协作多点传输方法。由仿真结果可知,所提出的策略和方法均有效提升了系统的边缘频谱效率和平均频谱效率,而且不会带来太大的复杂度和信令开销。
The introduction of the concept of cellular work in the Public Land Mobile network has greatly improved the spectral efficiency by reusing the frequency resource in different cells. But the edge of a certain cell is located between its neighboring cells, thus the UEs(user equipment) in the area will not only receive weak signal from its serving cell, but also suffer from great interference from its neighboring cells, which will result in low SINR(signal-to-interference and noise-ratio) and small cover range of the network.
As a key physical aspect technology in LTE-A(Long Term Evolution-Advance), CoMP(Coordinated Multi-Point Transmission and Reception) is adopted to improve both the edge UEs'throughput and the average throughput of the cell, in the way of introducing the cooperation transmission to reduce or even mitigate the co-channel interference.
This thesis was focused on study CoMP schemes which were feasible on the real network scenarios. The key achievements can be summarized as follows:
Ⅰ. Described the basic content and research background from a lot of academic literatures and 3GPP (The 3rd Generation Partnership Project) documents, analyzed the existing achievement in CoMP. Promoted frames of CoMP, mainly on the cell selection and resource allocation.
Ⅱ. Implemented up a simulation platform for LTE-A CoMP, designed and built the edge-user determine module, the cooperating cells selection module, the cooperating resource allocation module and the joint processing function. The simulation platform is based on object-oriented programming, with good applicability and extensible. The result of the simulation platform is equal with 3 GPP Technology Report.
Ⅲ. Proposed a dynamic cooperating resource allocation scheme and a multi-objective cooperating cells selection scheme, and an adaptive multi-point transmission method which could ensure the quality of service. The simulation results showed that all the proposed schemes and method improve the average spectral efficiency and cell-edge UEs' spectral efficiency with limited complexity and less signaling overhead.
引文
[1]V.H.MacDonald Advanced mobile phone service:The cellular concept Bell System Technical Journal vol.58 Jan,1979 pp.15-41
[2]T.S.Rappaport Wireless Communications:Principles and Practice 2nd Edition Prentice-Hall 1996 pp.68-72
[3]Q.Wang, D.Jiang, G.Liu, Z.Yan Coordinated Multi-Points Transmission for LTE-Advanced Systems In IEEE The 5th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2009) Beijing, China 2009 pp.1-4
[4]A.S.Ibrahim, A.K.Sadek, Su Weifeng, K.J.Ray Liu Cooperative Communications with Relay-Selection:When to Cooperate and Whom to Cooperate With? IEEE Transactions on Wireless Communications vol.7(no.7) Jul,2008 pp.2814-2827
[5]S.Sesia, I.Toufik, M.Baker LTE, The UMTS Long Term Evolution:From Theory to Practice John Wiley & Sons 2009 pp.7-12
[6]TSG-RAN TR36.913 V9.0.0-2009 Requirements for further advancements for E-UTRA (LTE-Advanced) France,3GPP,2009
[7]TSG-RAN TR36.912 V9.3.0-2010 Feasibility study for Further Advancements for E-UTRA (LTE-Advanced) France,3GPP,2010
[8]TSG-RAN 3GPP TR36.814 V9.0.0-2010 Further advancements for E-UTRA physical layer aspects France,3GPP,2010
[9]Panasonic R1-091746, Discussion on the Relationship between CoMP Sets Panasonic San Francisco, USA 3GPP May,2009
[10]赵训威,林辉,张明等3GPP长期演进系统架构与技术规范人民邮电出版社2010 pp.217-218
[11]Pantech & Curitel Ri-092593 Consideration on determining cooperative eNBs in Joint Transmission CoMP scheme Los Angeles,3GPP,2009
[12]W.Zirwas, W.Mennerich, M.Schubert, et al. Long Term Evolution:3GPP LTE Radio and Cellular Technology Auerbach Publications, CRC Press 2009 pp.232-242
[13]S.Brueck, Zhao Lu, J.Giese, M.A.Amin Centralized scheduling for joint transmission coordinated multi-point in LTE-Advanced in IEEE 2010 International ITG Workshop on Smart Antennas(WSA 2010) 2010 pp.177-184
[14]Huawei R1-093834, Backhaul Issues and its Practical Evaluation Methodology for DL CoMP Miyazaki, Japan 3GPP Oct,2009
[15]CMCC R1-091830, Views on the relationship among CoMP sets CMCC San Francisco, USA 3GPP May,2009
[16]Samsung R1-090613 Discussions on CoMP SU-MIMO Athens,3GPP, 2009
[17]ST Microelectronics R1-084496 Advantages and Limitations of Cooperative MIMO for LTE-A Prague,3GPP,2008
[18]NEC Group R1-091687 Discussion on the relation between CoMP cooperating set and CoMP reporting set San Francisco,3GPP,2009
[19]LG Electronics R1-090657 Dynamic Cell Clustering for CoMP Athens, 3GPP,2009
[20]S.Ramprashad, G.Caire Cellular vs. Network MIMO:A comparison including the channel state information overhead in IEEE The 20th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC 2009) Tokyo, Japan 2009 pp.878-884
[21]Nortel R1-084464 Cell Clustering for CoMP Transmission/Reception Prague,3GPP,2008
[22]ST Microelectronics R1-084496 Advantages and Limitations of Cooperative MIMO for LTE-A Prague,3GPP,2008
[23]Samsung R1-092653 Design Considerations for COMP Joint Transmission Los Angeles,3GPP,2009
[24]Potevio R1-091415, Further discussion of frequency plan scheme on CoMP-SU-MIMO Seoul,3GPP,2009
[25]CATT R2-094332 The Scheduling Priority in CoMP Shenzhen,3GPP, 2009
[26]J.C.Ikuno, M.Wrulich, M.Rupp System level simulation of LTE networks in IEEE The 71 th Vehicular Technology Conference(VTC 2010-Spring) Taipei, Taiwan 2010 pp.1-5
[27]TSG-RAN TR25.814 V7.1.0-2006 Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA) France,3GPP,2006
[28]H.Claussen Efficient modeling of channel maps with correlated shadow fading in mobile radio systems in IEEE The 16th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC 2005) Berlin, Germany 2005 pp.512-516.
[29]Zheng Yahong Rosa, Xiao Chengshan Simulation models with correct statistical properties for Rayleigh fading channels IEEE Transactions on Communications Vol.51 (Issue 6) 2003 pp.920-928
[30]L.Thiele, T. Wirth, K.Borner, et al. Modeling of 3D Field Patterns of Downtilted Antennas and Their Impact on Cellular Systems in IEEE 2009 International ITG Workshop on Smart Antennas (WSA 2009) Berlin, Germany 2009 pp.1-5
[31]Orange, China Mobile, KPN, et.al. R1-070674 LTE physical layer framework for performance verification St. Louis,3GPP,2007
[32]Li Jingya, Zhang Hui, Xu Xiaodong, et al. A Novel Frequency Reuse Scheme for Coordinated Multi-Point Transmission in IEEE The 71 st Vehicular Technology Conference(VTC2010-Spring) Taipei, Taiwan 2010 pp.1-5
[33]TSG-RAN TR 36.942-V 10.2.0 Radio Frequency (RF) system scenarios France,3GPP,2010
[34]TSG-RAN TR 36.819-V11.0.0 Coordinated multi-point operation for LTE physical layer aspects France,3GPP,2011
[35]Potevio R1-091970 Discussion of interference coordination for inter-eNB CoMP Transmission San Francisco,3GPP,2009
[36]Gao Youjun, Wang Qixing, Liu Guangyi The Access Network and Protocol Design for CoMP Technique in LTE-Advanced System in IEEE The 6th International Conference on Wireless Communications Networking and Mobile Computing(WiCOM 2010) Chengdu, China 2010 pp.1-4
[37]Hitachi Ltd. R1-092838 Adaptive Cell Clustering for CoMP in LTE-A Los Angeles,3GPP,2009
[38]Potevio R1-091969, Considerations on the selection method for CoMP cells San Francisco,3GPP,2009
[39]WANG Xijun, TIAN Hui, JIANG Fan, et. al. Cell-Cluster Based Traffic Load Balancing in Cooperative Cellular Networks Communications Society in IEEE The 7th Consumer Communications and Networking Conference(CCNC 2010) 2010 pp.1-5
[40]A.Papadogiannis, D.Gesbert, E.Hardouin, et al. A Dynamic Clustering Approach in Wireless Networks with Multi-Cell Cooperative Processing in IEEE 2008 International Conference on Communications(ICC 2008) 2008 pp.4033-4037
[41]TSG-RAN TS 36.214 V10.1.0-2011 Physical layer Measurements France,3GPP,2011
[42]Chen-Nee Chuah, David N. C. Tse, Joseph M. Kahn, et al. Capacity Scaling in MIMO Wireless Systems Under Correlated Fading IEEE Transactions on Information Theory vol.48(no.3) Mar,2002 pp.637-650
[43]TSG-RAN TS 36314 V10.2.0-011-09 Layer 2-Measurements France, 3GPP,2010
[44]杜伟解读LTE对承载网的需求华为技术专刊第40期2009pp.38-40
[45]TSG-RAN TS 23.203 V10.1.0-2005 Policy and Charging Control Architecture France,3GPP,2005
[2]T.S.Rappaport Wireless Communications:Principles and Practice 2nd Edition Prentice-Hall 1996 pp.68-72
[3]Q.Wang, D.Jiang, G.Liu, Z.Yan Coordinated Multi-Points Transmission for LTE-Advanced Systems In IEEE The 5th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM 2009) Beijing, China 2009 pp.1-4
[4]A.S.Ibrahim, A.K.Sadek, Su Weifeng, K.J.Ray Liu Cooperative Communications with Relay-Selection:When to Cooperate and Whom to Cooperate With? IEEE Transactions on Wireless Communications vol.7(no.7) Jul,2008 pp.2814-2827
[5]S.Sesia, I.Toufik, M.Baker LTE, The UMTS Long Term Evolution:From Theory to Practice John Wiley & Sons 2009 pp.7-12
[6]TSG-RAN TR36.913 V9.0.0-2009 Requirements for further advancements for E-UTRA (LTE-Advanced) France,3GPP,2009
[7]TSG-RAN TR36.912 V9.3.0-2010 Feasibility study for Further Advancements for E-UTRA (LTE-Advanced) France,3GPP,2010
[8]TSG-RAN 3GPP TR36.814 V9.0.0-2010 Further advancements for E-UTRA physical layer aspects France,3GPP,2010
[9]Panasonic R1-091746, Discussion on the Relationship between CoMP Sets Panasonic San Francisco, USA 3GPP May,2009
[10]赵训威,林辉,张明等3GPP长期演进系统架构与技术规范人民邮电出版社2010 pp.217-218
[11]Pantech & Curitel Ri-092593 Consideration on determining cooperative eNBs in Joint Transmission CoMP scheme Los Angeles,3GPP,2009
[12]W.Zirwas, W.Mennerich, M.Schubert, et al. Long Term Evolution:3GPP LTE Radio and Cellular Technology Auerbach Publications, CRC Press 2009 pp.232-242
[13]S.Brueck, Zhao Lu, J.Giese, M.A.Amin Centralized scheduling for joint transmission coordinated multi-point in LTE-Advanced in IEEE 2010 International ITG Workshop on Smart Antennas(WSA 2010) 2010 pp.177-184
[14]Huawei R1-093834, Backhaul Issues and its Practical Evaluation Methodology for DL CoMP Miyazaki, Japan 3GPP Oct,2009
[15]CMCC R1-091830, Views on the relationship among CoMP sets CMCC San Francisco, USA 3GPP May,2009
[16]Samsung R1-090613 Discussions on CoMP SU-MIMO Athens,3GPP, 2009
[17]ST Microelectronics R1-084496 Advantages and Limitations of Cooperative MIMO for LTE-A Prague,3GPP,2008
[18]NEC Group R1-091687 Discussion on the relation between CoMP cooperating set and CoMP reporting set San Francisco,3GPP,2009
[19]LG Electronics R1-090657 Dynamic Cell Clustering for CoMP Athens, 3GPP,2009
[20]S.Ramprashad, G.Caire Cellular vs. Network MIMO:A comparison including the channel state information overhead in IEEE The 20th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC 2009) Tokyo, Japan 2009 pp.878-884
[21]Nortel R1-084464 Cell Clustering for CoMP Transmission/Reception Prague,3GPP,2008
[22]ST Microelectronics R1-084496 Advantages and Limitations of Cooperative MIMO for LTE-A Prague,3GPP,2008
[23]Samsung R1-092653 Design Considerations for COMP Joint Transmission Los Angeles,3GPP,2009
[24]Potevio R1-091415, Further discussion of frequency plan scheme on CoMP-SU-MIMO Seoul,3GPP,2009
[25]CATT R2-094332 The Scheduling Priority in CoMP Shenzhen,3GPP, 2009
[26]J.C.Ikuno, M.Wrulich, M.Rupp System level simulation of LTE networks in IEEE The 71 th Vehicular Technology Conference(VTC 2010-Spring) Taipei, Taiwan 2010 pp.1-5
[27]TSG-RAN TR25.814 V7.1.0-2006 Physical layer aspects for evolved Universal Terrestrial Radio Access (UTRA) France,3GPP,2006
[28]H.Claussen Efficient modeling of channel maps with correlated shadow fading in mobile radio systems in IEEE The 16th International Symposium on Personal, Indoor and Mobile Radio Communications(PIMRC 2005) Berlin, Germany 2005 pp.512-516.
[29]Zheng Yahong Rosa, Xiao Chengshan Simulation models with correct statistical properties for Rayleigh fading channels IEEE Transactions on Communications Vol.51 (Issue 6) 2003 pp.920-928
[30]L.Thiele, T. Wirth, K.Borner, et al. Modeling of 3D Field Patterns of Downtilted Antennas and Their Impact on Cellular Systems in IEEE 2009 International ITG Workshop on Smart Antennas (WSA 2009) Berlin, Germany 2009 pp.1-5
[31]Orange, China Mobile, KPN, et.al. R1-070674 LTE physical layer framework for performance verification St. Louis,3GPP,2007
[32]Li Jingya, Zhang Hui, Xu Xiaodong, et al. A Novel Frequency Reuse Scheme for Coordinated Multi-Point Transmission in IEEE The 71 st Vehicular Technology Conference(VTC2010-Spring) Taipei, Taiwan 2010 pp.1-5
[33]TSG-RAN TR 36.942-V 10.2.0 Radio Frequency (RF) system scenarios France,3GPP,2010
[34]TSG-RAN TR 36.819-V11.0.0 Coordinated multi-point operation for LTE physical layer aspects France,3GPP,2011
[35]Potevio R1-091970 Discussion of interference coordination for inter-eNB CoMP Transmission San Francisco,3GPP,2009
[36]Gao Youjun, Wang Qixing, Liu Guangyi The Access Network and Protocol Design for CoMP Technique in LTE-Advanced System in IEEE The 6th International Conference on Wireless Communications Networking and Mobile Computing(WiCOM 2010) Chengdu, China 2010 pp.1-4
[37]Hitachi Ltd. R1-092838 Adaptive Cell Clustering for CoMP in LTE-A Los Angeles,3GPP,2009
[38]Potevio R1-091969, Considerations on the selection method for CoMP cells San Francisco,3GPP,2009
[39]WANG Xijun, TIAN Hui, JIANG Fan, et. al. Cell-Cluster Based Traffic Load Balancing in Cooperative Cellular Networks Communications Society in IEEE The 7th Consumer Communications and Networking Conference(CCNC 2010) 2010 pp.1-5
[40]A.Papadogiannis, D.Gesbert, E.Hardouin, et al. A Dynamic Clustering Approach in Wireless Networks with Multi-Cell Cooperative Processing in IEEE 2008 International Conference on Communications(ICC 2008) 2008 pp.4033-4037
[41]TSG-RAN TS 36.214 V10.1.0-2011 Physical layer Measurements France,3GPP,2011
[42]Chen-Nee Chuah, David N. C. Tse, Joseph M. Kahn, et al. Capacity Scaling in MIMO Wireless Systems Under Correlated Fading IEEE Transactions on Information Theory vol.48(no.3) Mar,2002 pp.637-650
[43]TSG-RAN TS 36314 V10.2.0-011-09 Layer 2-Measurements France, 3GPP,2010
[44]杜伟解读LTE对承载网的需求华为技术专刊第40期2009pp.38-40
[45]TSG-RAN TS 23.203 V10.1.0-2005 Policy and Charging Control Architecture France,3GPP,2005