AFDD移动通信系统中的频率分配技术研究
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摘要
随着通信系统的不断发展,高速数据业务在未来移动通信系统中占有越来越大的比重,高速数据业务具有上下行传输速率不对称的显著特点。不仅如此,随着数据传输速率的提高,所需的发射功率也相应提高,对人类和环境的影响也越来越大。研究表明:上下行传输率具有明显的非对称特性,上行链路的传输速率是受限的,而下行链路的传输速率远远大于上行链路。
移动通信系统是利用双工技术来实现上下行资源分割的,合适的双工技术能适应移动通信的上下行非对称传输需求,从而提高无线资源的利用效率。目前已有的能适应该需求的双工技术有时分双工技术——TDD和自适应动态非对称频分双工技术——AFDD。其中,TDD是一种传统的双工技术,虽然能支持上下行的非对称传输,但容易发生交叉时隙干扰。AFDD是本研究室依托国家自然科学基金提出的一种新型双工技术,该技术没有交叉时隙干扰问题,能够根据用户需要灵活分配上下行频率资源,降低小区间干扰,从而提高频谱利用效率。
论文第四章根据AFDD的特点,提出了两种频率分配方案,分别为“基于小区间干扰抑制的AFDD系统频率分配方案”和“基于用户干扰定制的AFDD/CDMA系统频率分配方案”。其中,前者的出发点为最低化小区间干扰,后者的出发点为通过给CDMA系统中的用户分配具有相应干扰水平的频点,来实现用户对传输频点的干扰定制。结果表明,这两种分配方案均能良好地实现其预期效果。
With the development of communication system, the high data rate traffic plays more and more important part in future mobile communication system, and the high data rate traffic is characterized by the uplink rate being asymmetric to downlink rate. Furthermore, with increase of transmission rate, the power is also enhanced and the impact on human and environment is growing. By calculation it shows that: under the restriction of electromagnetic radiation, the uplink transmission rate is limited, while the downlink rate is much higher than that of uplink.
Duplex technology is used to divide radio resource between uplink and downlink in mobile communication systems, and a proper duplex technology can meet the asymmetric transmission requirement between uplink and downlink, improving utilization efficiency of radio resource. At present, two duplex technologies can meet this requirement, and they are time division duplex -TDD and Asymmetric Frequency Division Duplex - AFDD. TDD is a traditional technology, which could meet the asymmetric transmission requirement but would bring cross time slot interference. AFDD is a novel duplex technology which has no cross time slot interference, and can allocate uplink and downlink resource flexibly according to users' requirement, mitigating inter-cell interference and improving frequency utilization efficiency.
The fourth part of this paper proposed two frequency allocation schemes according to AFDD. They are based on inter-cell interference mitigation and user customization respectively. In the first scheme, the aim is to mitigate inter-cell interference. In the second scheme, the aim is to assign frequencies with the custom-built interference level to users according to their requirement. It's proved that the two schemes can achieve the expected results.
移动通信系统是利用双工技术来实现上下行资源分割的,合适的双工技术能适应移动通信的上下行非对称传输需求,从而提高无线资源的利用效率。目前已有的能适应该需求的双工技术有时分双工技术——TDD和自适应动态非对称频分双工技术——AFDD。其中,TDD是一种传统的双工技术,虽然能支持上下行的非对称传输,但容易发生交叉时隙干扰。AFDD是本研究室依托国家自然科学基金提出的一种新型双工技术,该技术没有交叉时隙干扰问题,能够根据用户需要灵活分配上下行频率资源,降低小区间干扰,从而提高频谱利用效率。
论文第四章根据AFDD的特点,提出了两种频率分配方案,分别为“基于小区间干扰抑制的AFDD系统频率分配方案”和“基于用户干扰定制的AFDD/CDMA系统频率分配方案”。其中,前者的出发点为最低化小区间干扰,后者的出发点为通过给CDMA系统中的用户分配具有相应干扰水平的频点,来实现用户对传输频点的干扰定制。结果表明,这两种分配方案均能良好地实现其预期效果。
With the development of communication system, the high data rate traffic plays more and more important part in future mobile communication system, and the high data rate traffic is characterized by the uplink rate being asymmetric to downlink rate. Furthermore, with increase of transmission rate, the power is also enhanced and the impact on human and environment is growing. By calculation it shows that: under the restriction of electromagnetic radiation, the uplink transmission rate is limited, while the downlink rate is much higher than that of uplink.
Duplex technology is used to divide radio resource between uplink and downlink in mobile communication systems, and a proper duplex technology can meet the asymmetric transmission requirement between uplink and downlink, improving utilization efficiency of radio resource. At present, two duplex technologies can meet this requirement, and they are time division duplex -TDD and Asymmetric Frequency Division Duplex - AFDD. TDD is a traditional technology, which could meet the asymmetric transmission requirement but would bring cross time slot interference. AFDD is a novel duplex technology which has no cross time slot interference, and can allocate uplink and downlink resource flexibly according to users' requirement, mitigating inter-cell interference and improving frequency utilization efficiency.
The fourth part of this paper proposed two frequency allocation schemes according to AFDD. They are based on inter-cell interference mitigation and user customization respectively. In the first scheme, the aim is to mitigate inter-cell interference. In the second scheme, the aim is to assign frequencies with the custom-built interference level to users according to their requirement. It's proved that the two schemes can achieve the expected results.
引文
[1].韦惠民,李白萍编著.蜂窝移动通信技术[M].西安电子科技大学出版社,2002
[2].陈南阳.简述GSM移动通信系统与移动电话性能测试[J].移动通信,2004,7
[3].刘亚娇.多业务蜂窝移动通信系统中切换技术的研究[D].北京邮电大学硕士论文,2005
[4].郎为民.WCDMA标准化进展[J].网络通信.2006,1-2期
[5].王卫东等.第三代移动通信系统设计原理与规划[M].电子工业出版社,2007
[6].张英海.自适应双工技术研究[D].北京邮电大学博士学位论文,2007
[7].WANG Weidong,ZHANG Yinghai,Zhou Kaijie,Zhang Heng,Research on asymmetric characteristics of mobile communications system based on electromagnetic radiation[C].Progress in Electromagnetics Research Symposium.2007,Prague.
[8].RIKKINEN K,WILDEY C.WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A]. 3G Mobile Communication Technologies, 2003. 3G 2003. 4th International Conference[C]. 2003. 294-298.
[9]. SCHWARZ U, RIKKINEN K, MUSZYNSKI P. Radio resource management solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A]. Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings[C]. 2003. 1481-1484.
[10].3GPP, Feasibility Study Considering the Viable Deployment of UTRA in Additional and Diverse Spectrum Arrangements[S]. 3GPPTR 25.889 V6.0.
[1]The evolution path of 4G networks FDD or TDD.Chan,P.W.C.,Lo,E.S.,Wang,R.R.,Au,E.K.S.,Lau,V.K.N.,Cheng,R.S.,Wai Ho Mow,Murch,R.D.,Letaief,K.B..IEEE Communications Magazine,Volume 44,Issue 12,Dec.2006,Page(s):42- 50.
[2]谢显中等.基于TDD的第四代移动通信技术[M].电子工业出版社.2005年.
[3]张宇.TD-SCDMA可变切换点分析及解决方案[J].通信世界,2005,20:33.
[4]WIE S H,CHO D H.Time slot allocation schemes based on a region division in CDMA / TDD systems[A].Vehicular Technology Conference,VTC 2001 Spring.IEEE VTS 53rd[C].2001.2445-2449.
[5]WANG L C,CHEN Y C.A novel link proportional dynamic channel assignment for TDD-CDMA systems with directional antennas[A].Networking,Sensing an d Control,2004 IEEE International Conference[C].2004.164-169
[6]张英海,王卫东,董宇,周凯捷.一种适应未来移动通信系统的新型动态双工技术方案[J].通信学报,2007,30(5),133-140
[7]张英海.自适应双工技术研究[D].北京邮电大学博士学位论文,2007
[8]WANG Weidong,ZHANG Yinghai,Zhou Kaijie,Zhang Heng,Research on asymmetric characteristics of mobile communications system based on electromagnetic radiation[C].Progress in Electromagnetics Research Symposium.2007,Prague.
[9]郭梯云,邬国扬,李建东.移动通信[M].西安电子科技大学出版社,2001年
[10]吴伟陵,牛凯.移动通信原理[M].电子工业出版社,2005年,245-249
[11]Shimon Moshavi.Multi2user Detection for DS2CDMA communications[J].IEEE Communications Magazine,1996,34(10):124 - 136.
[12]陈斌,胡宏林,张小东,卜智勇.未来移动通信系统中的小区间干扰协调技术[J].电信科学.2006(6)
[13]孙志刚,柳平,轻舟.移动通信终端电磁辐射对人体影响的FDTD分析[J],汕头大学学报,2004(5)
[14]康刚,祝西里,王长清.单极天线手机对人体作用的电磁剂量学分析[J],北京大学学报,1996(9)
[15]杨大成.移动传播环境[M].北京.机械工业出版社,2003
[16] RIKKINEN K, WILDEY C. WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A]. 3G Mobile Communication Technologies, 2003. 3G 2003. 4th International Conference[C]. 2003. 294-298.
[17] SCHWARZ U, RIKKINEN K, MUSZYNSKI P. Radio resource management solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A]. Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings[C]. 2003. 1481-1484
[1]张英海,王卫东,董宇,周凯捷.一种适应未来移动通信系统的新型动态双工技术方案[J].通信学报,2007,30(5),133-140
[2]RIKKINEN K,WILDEY C.WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A].3G Mobile Communication Technologies,2003.3G 2003.4th International Conference[C].2003.294-298.
[3]SCHWARZ U,RIKKINEN K,MUSZYNSKI P.Radio resource mana- gement solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A].Personal,Indoor and Mobile Radio Communications,2003.PIMRC 2003.14th IEEE Proceedings[C].2003.1481-1484.
[4]3GPP,Feasibility Study Considering the Viable Deployment of UTRA in Additional and Diverse Spectrum Arrgements[S].3GPPTR 25.889 V6.0.0.
[5]Harri Holma,Antti Toskala,WCDMA for UMTS---Radio Access for Third Generation Mobile Communications(Second Edition),John Wiley & Sons,LTD,2002
[6]周凯捷.未来移动通信中的非对称传输技术研究[D].北京邮电大学硕士学位论文,2008
[7]陈鑫林,现代通信中的排队论[M].北京.电子工业出版社,1999
[8]Ian A.Glover,Peter M.Grant数字通信[M].北京,机械工业出版社,200
[1]Adachi F,Sawahashi M,Suda H.Wideband DS-CDMA For Next-Generation Mobile Communications Systems[J].IEEE Communications Magazine,1998,36(9):56-69.
[2]Pei Xiaoyan,Chen Xi,Hu Jiandong.Joint Power Control,Beamforming And Interference Cancelling In CDMA System[J].Journal of Beijing University of Posts and Telecommunications,2001,24(4):6-10.
[3]Zhang Xunyong,He Chen,Jiang Lingge.Inter-cell Interference Coordination Based On Softer Frequency Reuse In OFDMA Cellular Systems[J].Neural Networks and Signal Processing,2008International Conference,2008,270-275.
[4]Fan Bin,Qian Yu,Zheng Kan.A Dynamic Resource Allocation Scheme Based on Soft Frequency Reuse for OFDMA Systems[J].Antenna,Propagation and EMC Technologies for Wireless Communications,2007 International Symposium,2007,1-4.
[5]许方敏,陶小峰,许晓东.软分数频率复用[J].中兴通讯技术,2007,13(4):17-19.
[6]Moshavi S,Bellcore R B.Multi-user Detection For DS-CDMA Communications[J].IEEE Communications Magazine,1996,34(10):124-136.
[7]Andrews J G.Interference Cancellation For Cellular Systems:A Contemporary Overview[J].IEEE Wireless Communications,2005,12(2):19-29.
[8]Shankar K R,Chockalingam A.Parallel Interference Cancellation In Multicarrier DS-CDMA Systems[J].Communications,2004 IEEE International Conference,2004,5:2874-2878.
[9]徐键,何晨,汪晴川.多小区CDMA系统的小区间干扰研究分析[J].信息技术,2008,(6):110-113.
[10]张英海,王卫东,董宇,等.适应未来移动通信系统的新型自适应双工技术方案[J].通信学报,2007,28(6):133-140.
[11]Emeric Gu(?)guen,Matthieu Crussi(?)re,Jean-Franc,ois H(?)lard.An OFDM-CDMA scheme for High Data Rate UWB applications[J].VTC2007-Spring(04/2007)2905-2909
[12]Weimin Xiao,Rapeepat Ratasuk,Amitava Ghosh,Robert Love.Scheduling and Resource Allocation of Enhanced Uplink for 3GPP W-CDMA[J].2005 IEEE 16th International Symposium on Personal,Indoor and Mobile Radio Communications
[13]Shalinee Kishore,Larry J.Greenstein,H.Vincent Poor,Stuart C.Schwartz.Soft Handoff and Uplink Capacity in a Two-Tier CDMA System.IEEE transactions on wireless communications,VOL.4,NO.4,JULY 2005
[14]郭梯云,邬国扬,李建东.《移动通信》.西安电子科技大学出版社,2001年
[2].陈南阳.简述GSM移动通信系统与移动电话性能测试[J].移动通信,2004,7
[3].刘亚娇.多业务蜂窝移动通信系统中切换技术的研究[D].北京邮电大学硕士论文,2005
[4].郎为民.WCDMA标准化进展[J].网络通信.2006,1-2期
[5].王卫东等.第三代移动通信系统设计原理与规划[M].电子工业出版社,2007
[6].张英海.自适应双工技术研究[D].北京邮电大学博士学位论文,2007
[7].WANG Weidong,ZHANG Yinghai,Zhou Kaijie,Zhang Heng,Research on asymmetric characteristics of mobile communications system based on electromagnetic radiation[C].Progress in Electromagnetics Research Symposium.2007,Prague.
[8].RIKKINEN K,WILDEY C.WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A]. 3G Mobile Communication Technologies, 2003. 3G 2003. 4th International Conference[C]. 2003. 294-298.
[9]. SCHWARZ U, RIKKINEN K, MUSZYNSKI P. Radio resource management solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A]. Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings[C]. 2003. 1481-1484.
[10].3GPP, Feasibility Study Considering the Viable Deployment of UTRA in Additional and Diverse Spectrum Arrangements[S]. 3GPPTR 25.889 V6.0.
[1]The evolution path of 4G networks FDD or TDD.Chan,P.W.C.,Lo,E.S.,Wang,R.R.,Au,E.K.S.,Lau,V.K.N.,Cheng,R.S.,Wai Ho Mow,Murch,R.D.,Letaief,K.B..IEEE Communications Magazine,Volume 44,Issue 12,Dec.2006,Page(s):42- 50.
[2]谢显中等.基于TDD的第四代移动通信技术[M].电子工业出版社.2005年.
[3]张宇.TD-SCDMA可变切换点分析及解决方案[J].通信世界,2005,20:33.
[4]WIE S H,CHO D H.Time slot allocation schemes based on a region division in CDMA / TDD systems[A].Vehicular Technology Conference,VTC 2001 Spring.IEEE VTS 53rd[C].2001.2445-2449.
[5]WANG L C,CHEN Y C.A novel link proportional dynamic channel assignment for TDD-CDMA systems with directional antennas[A].Networking,Sensing an d Control,2004 IEEE International Conference[C].2004.164-169
[6]张英海,王卫东,董宇,周凯捷.一种适应未来移动通信系统的新型动态双工技术方案[J].通信学报,2007,30(5),133-140
[7]张英海.自适应双工技术研究[D].北京邮电大学博士学位论文,2007
[8]WANG Weidong,ZHANG Yinghai,Zhou Kaijie,Zhang Heng,Research on asymmetric characteristics of mobile communications system based on electromagnetic radiation[C].Progress in Electromagnetics Research Symposium.2007,Prague.
[9]郭梯云,邬国扬,李建东.移动通信[M].西安电子科技大学出版社,2001年
[10]吴伟陵,牛凯.移动通信原理[M].电子工业出版社,2005年,245-249
[11]Shimon Moshavi.Multi2user Detection for DS2CDMA communications[J].IEEE Communications Magazine,1996,34(10):124 - 136.
[12]陈斌,胡宏林,张小东,卜智勇.未来移动通信系统中的小区间干扰协调技术[J].电信科学.2006(6)
[13]孙志刚,柳平,轻舟.移动通信终端电磁辐射对人体影响的FDTD分析[J],汕头大学学报,2004(5)
[14]康刚,祝西里,王长清.单极天线手机对人体作用的电磁剂量学分析[J],北京大学学报,1996(9)
[15]杨大成.移动传播环境[M].北京.机械工业出版社,2003
[16] RIKKINEN K, WILDEY C. WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A]. 3G Mobile Communication Technologies, 2003. 3G 2003. 4th International Conference[C]. 2003. 294-298.
[17] SCHWARZ U, RIKKINEN K, MUSZYNSKI P. Radio resource management solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A]. Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings[C]. 2003. 1481-1484
[1]张英海,王卫东,董宇,周凯捷.一种适应未来移动通信系统的新型动态双工技术方案[J].通信学报,2007,30(5),133-140
[2]RIKKINEN K,WILDEY C.WCDMA Scenarios For 2.5GHz IMT-2000 extension band supporting asymmetric frequency allocation[A].3G Mobile Communication Technologies,2003.3G 2003.4th International Conference[C].2003.294-298.
[3]SCHWARZ U,RIKKINEN K,MUSZYNSKI P.Radio resource mana- gement solution for WCDMA FDD system with asymmetric UL/DL carrier allocation[A].Personal,Indoor and Mobile Radio Communications,2003.PIMRC 2003.14th IEEE Proceedings[C].2003.1481-1484.
[4]3GPP,Feasibility Study Considering the Viable Deployment of UTRA in Additional and Diverse Spectrum Arrgements[S].3GPPTR 25.889 V6.0.0.
[5]Harri Holma,Antti Toskala,WCDMA for UMTS---Radio Access for Third Generation Mobile Communications(Second Edition),John Wiley & Sons,LTD,2002
[6]周凯捷.未来移动通信中的非对称传输技术研究[D].北京邮电大学硕士学位论文,2008
[7]陈鑫林,现代通信中的排队论[M].北京.电子工业出版社,1999
[8]Ian A.Glover,Peter M.Grant数字通信[M].北京,机械工业出版社,200
[1]Adachi F,Sawahashi M,Suda H.Wideband DS-CDMA For Next-Generation Mobile Communications Systems[J].IEEE Communications Magazine,1998,36(9):56-69.
[2]Pei Xiaoyan,Chen Xi,Hu Jiandong.Joint Power Control,Beamforming And Interference Cancelling In CDMA System[J].Journal of Beijing University of Posts and Telecommunications,2001,24(4):6-10.
[3]Zhang Xunyong,He Chen,Jiang Lingge.Inter-cell Interference Coordination Based On Softer Frequency Reuse In OFDMA Cellular Systems[J].Neural Networks and Signal Processing,2008International Conference,2008,270-275.
[4]Fan Bin,Qian Yu,Zheng Kan.A Dynamic Resource Allocation Scheme Based on Soft Frequency Reuse for OFDMA Systems[J].Antenna,Propagation and EMC Technologies for Wireless Communications,2007 International Symposium,2007,1-4.
[5]许方敏,陶小峰,许晓东.软分数频率复用[J].中兴通讯技术,2007,13(4):17-19.
[6]Moshavi S,Bellcore R B.Multi-user Detection For DS-CDMA Communications[J].IEEE Communications Magazine,1996,34(10):124-136.
[7]Andrews J G.Interference Cancellation For Cellular Systems:A Contemporary Overview[J].IEEE Wireless Communications,2005,12(2):19-29.
[8]Shankar K R,Chockalingam A.Parallel Interference Cancellation In Multicarrier DS-CDMA Systems[J].Communications,2004 IEEE International Conference,2004,5:2874-2878.
[9]徐键,何晨,汪晴川.多小区CDMA系统的小区间干扰研究分析[J].信息技术,2008,(6):110-113.
[10]张英海,王卫东,董宇,等.适应未来移动通信系统的新型自适应双工技术方案[J].通信学报,2007,28(6):133-140.
[11]Emeric Gu(?)guen,Matthieu Crussi(?)re,Jean-Franc,ois H(?)lard.An OFDM-CDMA scheme for High Data Rate UWB applications[J].VTC2007-Spring(04/2007)2905-2909
[12]Weimin Xiao,Rapeepat Ratasuk,Amitava Ghosh,Robert Love.Scheduling and Resource Allocation of Enhanced Uplink for 3GPP W-CDMA[J].2005 IEEE 16th International Symposium on Personal,Indoor and Mobile Radio Communications
[13]Shalinee Kishore,Larry J.Greenstein,H.Vincent Poor,Stuart C.Schwartz.Soft Handoff and Uplink Capacity in a Two-Tier CDMA System.IEEE transactions on wireless communications,VOL.4,NO.4,JULY 2005
[14]郭梯云,邬国扬,李建东.《移动通信》.西安电子科技大学出版社,2001年