基于LTE技术的eNodeB系统中MAC模块的设计与实现
摘要
本文首先通过对长期演进技术(LTE)中无线接入网络(E-UTRAN)协议组的分析,总结了eNodeB系统中MAC模块的主要功能,包括信道映射、信道解复用、自动混合重传纠错、传输格式选择等功能,从而确定了本文研究的目标与范围,为后续的设计与实现工作打下了基础。
其次,对于子模块划分的问题,本文采用了基于任务实时性要求的子模块划分方法,将MAC模块划分为5个子模块,包括业务管理子模块、数据分组调度子模块、自动混合重传子模块、缓存管理子模块和板内消息管理子模块,对协议要求的功能进行了分解实现,同时降低了耦合性,有利于实现任务的优先级顺序处理。
在实现阶段,本文针对eNodeB系统管理实现问题,采用了板内消息传递机制,使高层管理模块可以通过发送板内消息的方式来对eNodeB系统进行控制。在解决MAC模块与基带硬件模块的配合问题中,本文运用了基于TTI提前调度的调度机制,使MAC模块可以与基带协同工作,并提供符合LTE协议要求的上下行调度速率,以及混合自动重传功能。运用多线程互斥技术,并充分利用了WorkBench开发环境与VxWorks操作系统的多线程管理机制,解决了任务间的时序抢占问题,提高了MAC模块的运行的稳定性,满足了LTE系统中eNodeB系统的时序要求。
最后,采用基于移动PoC标准的综合测试手段,对MAC模块的系统管理、业务吞吐量、容错传输等方面进行了测试,验证了MAC模块的可行性和稳定性。
Major functions of MAC module in eNodeB system are concluded by analysis of the E-UTRAN in LTE, such as signal path mapped, HARQ and transformat selection, so that this research's objective and scope can be settled, and the foundation for the following design and execution is laid.
The sub-module dividing method based on the real-time requirement is used, MAC module is divided into five sub modules including operational management module, data grouping dispatch module, HARQ module and buffer manager module as well as internal information management module, functions required by the protocol are achieved and coupling is reduced which conduces to priority order processing.
Internal message passing mechanism is adopted to deal with eNodeB system management and thus eNodeB system can be controlled by senior management module through sending internal messages. The scheduling mechanism based on TTI scheduling in advance is used to coordinate MAC module and base band, and the scheduling rate from top to bottom line in accordance with LTE protocol and HARQ are provided. Mutually exclusive multi-threaded technology as well as WorkBench development environment and multi-thread management mechanism in VxWorks operating system are adopted to solve the problem of time sequence disorder among different tasks so that the stability of MAC module is enhanced and the time sequence requirement in eNodeB system within LTE system is met.
Integrated test facility based on Mobile PoC standard is used to conduct tests on system management of MAC module, business throughput and fault-tolerant transmission, and the feasibility and stability of MAC module is verified.
其次,对于子模块划分的问题,本文采用了基于任务实时性要求的子模块划分方法,将MAC模块划分为5个子模块,包括业务管理子模块、数据分组调度子模块、自动混合重传子模块、缓存管理子模块和板内消息管理子模块,对协议要求的功能进行了分解实现,同时降低了耦合性,有利于实现任务的优先级顺序处理。
在实现阶段,本文针对eNodeB系统管理实现问题,采用了板内消息传递机制,使高层管理模块可以通过发送板内消息的方式来对eNodeB系统进行控制。在解决MAC模块与基带硬件模块的配合问题中,本文运用了基于TTI提前调度的调度机制,使MAC模块可以与基带协同工作,并提供符合LTE协议要求的上下行调度速率,以及混合自动重传功能。运用多线程互斥技术,并充分利用了WorkBench开发环境与VxWorks操作系统的多线程管理机制,解决了任务间的时序抢占问题,提高了MAC模块的运行的稳定性,满足了LTE系统中eNodeB系统的时序要求。
最后,采用基于移动PoC标准的综合测试手段,对MAC模块的系统管理、业务吞吐量、容错传输等方面进行了测试,验证了MAC模块的可行性和稳定性。
Major functions of MAC module in eNodeB system are concluded by analysis of the E-UTRAN in LTE, such as signal path mapped, HARQ and transformat selection, so that this research's objective and scope can be settled, and the foundation for the following design and execution is laid.
The sub-module dividing method based on the real-time requirement is used, MAC module is divided into five sub modules including operational management module, data grouping dispatch module, HARQ module and buffer manager module as well as internal information management module, functions required by the protocol are achieved and coupling is reduced which conduces to priority order processing.
Internal message passing mechanism is adopted to deal with eNodeB system management and thus eNodeB system can be controlled by senior management module through sending internal messages. The scheduling mechanism based on TTI scheduling in advance is used to coordinate MAC module and base band, and the scheduling rate from top to bottom line in accordance with LTE protocol and HARQ are provided. Mutually exclusive multi-threaded technology as well as WorkBench development environment and multi-thread management mechanism in VxWorks operating system are adopted to solve the problem of time sequence disorder among different tasks so that the stability of MAC module is enhanced and the time sequence requirement in eNodeB system within LTE system is met.
Integrated test facility based on Mobile PoC standard is used to conduct tests on system management of MAC module, business throughput and fault-tolerant transmission, and the feasibility and stability of MAC module is verified.
引文
1.沈嘉.3GPP长期演进(LTE)技术原理与系统设计[M],北京:人民邮电出版社,2008:12-387.
2.张克平.LTE—B3G/4G移动通信系统无线技术[M],北京:电子工业出版社,2008:25-267.
3.Holma H,Toskala A.UMTS中的WCDMA——HSPA演进及LTE(原书第4版)[M],北京:机械工业出版社,2008:523-540.
4.Niklas Blum,Fabricio Carvalho de Gouveia,PThomas Magedanz.An Open IMS Testbed for exploring Wireless Service Evolution and Network Architecture Evolution towards SAE and LTE[M],USA:IEEE Computer Society,2007:34-50
5.林辉.LTE TDD系统的设计分析[J],电信网技术,2008,35(3):7-11.
6.姚斌.3GPP LTE无线接口协议及体系结构[J],移动通信,2007,33(12):54-57.
7.谢伟良,杨峰义.从CDMA到LTE的移动网络技术演进[J],电信科学,2009,30(1):27-31.
8.王立江.TD-SCDMA增强技术及其演进[J],电信网技术,2008,35(3):4-6.
9.张天魁,曾志民.3G LTE动态资源分配机制研究[J],移动通信,2007,33(12):58-61.
10.Raymond Kwan,Cyril Leung,Jie Zhang.Multiuser scheduling on the downlink of an LTE cellular system[J],Research Letters in Communications,2008,(2):1-4.
11.Juan Jesus Sanchez,David Morales-Jimenez,PGerardo Gomez,Eduardo Martos-Naya,Unai Fernandez-Plazaola.a platform for design and simulation of wireless mobile systems[J],International Workshop on Modeling Analysis and Simulation of Wireless and Mobile Systems,2007,(10):124-127.
12.官微,段红光.LTE关键技术及其发展趋势分析[J],电子测试,2009,11(5):22-25
13.唐海.TD-LTE的标准化工作及进展[J],电信科学,2009,30(1):22-26.
14.李新.TD-LTE无线网络覆盖特性浅析[J],电信科学,2009,30(1):43-47.
15.Ran Wan,Xian Zhong Xie.The Performance Of The 3G Long-Term Evolution Adoption Peer-to-Peer Network Mode[J],ICACC,2009,(1):720-723.
16.张自然,李俊,李长啸.基于多核处理器架构的LTE PUSCH信道解调译码并行处理 设计[J],中兴通讯技术,2009,15(1):53-56.
17.盛渊,罗新民.LTE系统中小区搜索算法研究[J],通信技术,2009,42(3):90-92.
18.杨骅,李世鹤.第三代移动通信与中国提案TD-SCDMA[J],电信技术,2001,48(1):9-13.
19.解大琴,徐俊杰.LTE时代的语音方案综述,电脑知识与技术,2008,14(2):71-72.
20.温得敏,Jorg Kohlschmidt.面向3G LTE基站设计的预处理解决方案[J],电子设计技术,2008,10(6):
21.王文静,钟章队.采用自适应调制的无线智能传输技术[J],移动通信,2001,27(1):26-29.
22.柳平增,毕树生,梁勇.一种通用无线智能终端的设计与实现[J],微计算机信息.2008,24(33):152-154.
23.肖达,林碧娇,肖明波.VoWLAN系统的MAC层改进机制[J],计算机工程与应用l 2009,45(12):101-103.
24.Seizo Onoe,Takehiro Nakamura,Kenichi Higuchi.3G evolution scenario toward 4G:Super 3G concept:Research Articles[J],Wireless Communications & Mobile Computing,2007,7(8):1013-1019.
25.Anil M.Rao,Andreas Weber,Sridhar Gollamudi,Robert Soni.LTE and HSPA+:Revolutionary and evolutionary solutions for global mobile broadband[J],Bell Labs Technical Journal,2009,13(4):7-34.
26.Andreas Ibing,David Kuhling,Marcel Kuszak,Clemens v.Helmolt,Volker Jungnickel.Flexible demonstrator platform for cooperative joint transmission and detection in next generation wireless MIMO-OFDM networks[J].Wireless communications & security,2008,(5):1-6.
27.3GPP TR 23.882 V1.9.0.3GPP system architecture evolution:report on technical options and conclusions,2007.
28.3GPP TS 36.300 V8.1.0.Evolved universal terrestrial radio access(E-UTRA)and evolved universal terrestrial radio access network(e-utran) overall description;and conclusions,2007.
29.周启平,张杨.VxWorks下设备驱动程序及BSP开发指南[M],北京:中国电力出版 社,2004,5-26.
30.徐惠民.基于VxWorks的嵌入式系统及实验[M],北京:北京邮电大学出版社,2006,53-134.
31.孔祥营,张保山,俞烈彬.VxWorks驱动及分布式编程[M],北京:中国电力出版社,2007,35-66.
32.陈能技.软件测试技术大全[M],北京:人民邮电出版社,2008,67-203.
33.段念.软件性能测试过程详解与案例剖析[M],北京:清华大学出版社,2006,58-97.
2.张克平.LTE—B3G/4G移动通信系统无线技术[M],北京:电子工业出版社,2008:25-267.
3.Holma H,Toskala A.UMTS中的WCDMA——HSPA演进及LTE(原书第4版)[M],北京:机械工业出版社,2008:523-540.
4.Niklas Blum,Fabricio Carvalho de Gouveia,PThomas Magedanz.An Open IMS Testbed for exploring Wireless Service Evolution and Network Architecture Evolution towards SAE and LTE[M],USA:IEEE Computer Society,2007:34-50
5.林辉.LTE TDD系统的设计分析[J],电信网技术,2008,35(3):7-11.
6.姚斌.3GPP LTE无线接口协议及体系结构[J],移动通信,2007,33(12):54-57.
7.谢伟良,杨峰义.从CDMA到LTE的移动网络技术演进[J],电信科学,2009,30(1):27-31.
8.王立江.TD-SCDMA增强技术及其演进[J],电信网技术,2008,35(3):4-6.
9.张天魁,曾志民.3G LTE动态资源分配机制研究[J],移动通信,2007,33(12):58-61.
10.Raymond Kwan,Cyril Leung,Jie Zhang.Multiuser scheduling on the downlink of an LTE cellular system[J],Research Letters in Communications,2008,(2):1-4.
11.Juan Jesus Sanchez,David Morales-Jimenez,PGerardo Gomez,Eduardo Martos-Naya,Unai Fernandez-Plazaola.a platform for design and simulation of wireless mobile systems[J],International Workshop on Modeling Analysis and Simulation of Wireless and Mobile Systems,2007,(10):124-127.
12.官微,段红光.LTE关键技术及其发展趋势分析[J],电子测试,2009,11(5):22-25
13.唐海.TD-LTE的标准化工作及进展[J],电信科学,2009,30(1):22-26.
14.李新.TD-LTE无线网络覆盖特性浅析[J],电信科学,2009,30(1):43-47.
15.Ran Wan,Xian Zhong Xie.The Performance Of The 3G Long-Term Evolution Adoption Peer-to-Peer Network Mode[J],ICACC,2009,(1):720-723.
16.张自然,李俊,李长啸.基于多核处理器架构的LTE PUSCH信道解调译码并行处理 设计[J],中兴通讯技术,2009,15(1):53-56.
17.盛渊,罗新民.LTE系统中小区搜索算法研究[J],通信技术,2009,42(3):90-92.
18.杨骅,李世鹤.第三代移动通信与中国提案TD-SCDMA[J],电信技术,2001,48(1):9-13.
19.解大琴,徐俊杰.LTE时代的语音方案综述,电脑知识与技术,2008,14(2):71-72.
20.温得敏,Jorg Kohlschmidt.面向3G LTE基站设计的预处理解决方案[J],电子设计技术,2008,10(6):
21.王文静,钟章队.采用自适应调制的无线智能传输技术[J],移动通信,2001,27(1):26-29.
22.柳平增,毕树生,梁勇.一种通用无线智能终端的设计与实现[J],微计算机信息.2008,24(33):152-154.
23.肖达,林碧娇,肖明波.VoWLAN系统的MAC层改进机制[J],计算机工程与应用l 2009,45(12):101-103.
24.Seizo Onoe,Takehiro Nakamura,Kenichi Higuchi.3G evolution scenario toward 4G:Super 3G concept:Research Articles[J],Wireless Communications & Mobile Computing,2007,7(8):1013-1019.
25.Anil M.Rao,Andreas Weber,Sridhar Gollamudi,Robert Soni.LTE and HSPA+:Revolutionary and evolutionary solutions for global mobile broadband[J],Bell Labs Technical Journal,2009,13(4):7-34.
26.Andreas Ibing,David Kuhling,Marcel Kuszak,Clemens v.Helmolt,Volker Jungnickel.Flexible demonstrator platform for cooperative joint transmission and detection in next generation wireless MIMO-OFDM networks[J].Wireless communications & security,2008,(5):1-6.
27.3GPP TR 23.882 V1.9.0.3GPP system architecture evolution:report on technical options and conclusions,2007.
28.3GPP TS 36.300 V8.1.0.Evolved universal terrestrial radio access(E-UTRA)and evolved universal terrestrial radio access network(e-utran) overall description;and conclusions,2007.
29.周启平,张杨.VxWorks下设备驱动程序及BSP开发指南[M],北京:中国电力出版 社,2004,5-26.
30.徐惠民.基于VxWorks的嵌入式系统及实验[M],北京:北京邮电大学出版社,2006,53-134.
31.孔祥营,张保山,俞烈彬.VxWorks驱动及分布式编程[M],北京:中国电力出版社,2007,35-66.
32.陈能技.软件测试技术大全[M],北京:人民邮电出版社,2008,67-203.
33.段念.软件性能测试过程详解与案例剖析[M],北京:清华大学出版社,2006,58-97.