LTE-TDD竞争随机接入过程的实现
发布时间：2018-07-13 07:51
【摘要】：随着无线宽带技术的不断发展和应用,LTE(Long Term Evolution,长期演进)的技术正在不断的趋于成熟,并且已经进入了商用化的接入调试的最后实现阶段,对于LTE的众多协议特性基本都趋于统一,随机接入功能是实现终端宽带接入的重要功能,它的实现对于LTE 4G网络来说是一项最基本、最重要的性能指标,对于LTE随机接入功能的具体实现方式各个设备制造商各不相同,主要是在层一(PHY层)和层二(MAC层)上的实现分歧比较大,基于此原因需要提出一个比较合理、互联互通性比较强的实现方案,并且需要通过测试来验证随机接入功能的合理性和正确性。LTE要实现的目标是在不同带宽条件下如1.4MHz、3MHz、5MHz、10MHz、15MHz和20M的带宽条件下面,能够实现上下行的高速率。为了实现LTE的技术,对于能够使无线信号稳定的,准确的接入LTE系统并且能够正常工作已经成为LTE系统稳定性的一个重要的衡量标准。在实现LTE通信系统时,采用了使LTE协议栈运行在Linux的操作系统平台之上的方式,并且在Linux的平台上进行研发测试。LTE通信系统可以分为频分双工复用(FDD)和时分双工复用(TDD)两种,本论文所要介绍的重点是LTE-TDD的通信系统,并且如何将3GPP的随机接入协议转化成LTE-TDD通信系统中的随机接入功能,并能够将随机接入功能够完全实现在LTE的通信系统中,随后能够对于LTE-TDD随机接入功能的实现进行有效的,科学的测试。同时也会介绍各种随机接入的实现和空口协议。最后对实现方案提出改进想法和发展方向。对于在LTE-TDD通信系统中随机接入功能的实现和验证主要做了一下几方面的工作:1.对于3GPP协议中关于随机接入功能进行理解和分析。本文对3GPP的随机接入功能进行分析和理解,并且根据随机接入的流程特点参照LTE-TDD通信系统的特点设计一套科学的随机接入的实现方案。2.对于LTE-TDD系统中的竞争随机接入过程进行实现设计,并且把随机分为两部分。即对物理随机接入信道的实现设计与接入的过程在LTE-TDD的媒质接入控制层的实现设计,在媒质接入控制层的实现设计阶段主要是对层二的功能模块进行了设计,并且对这些功能模块在系统中的作用做了详细的介绍。3.将3GPP协议中的竞争随机接入过程在真实的LTE-TDD的系统中得以实现。并且根据3GPP协议中竞争随机接入过程的消息信令的交互,转化成TLE-TDD系统中的竞争随机接入过程功能。对于在实现竞争随机接入过程中,各模块在实现中所起的作用和工作的原理也做了详细的说明。并且对每个实现竞争随机接入过程的消息信令进行具体的定义和实现。4.对于在真实LTE-TDD系统中实现的竞争随机接入过程进行科学、详细的测试与验证工作。并且同时对照3GPP协议中定义的一些竞争型随机接入过程的消息参数进行测试与验证,最终证明随机接入过程在真实LTE-TDD系统中得以实现。5.通过对LTE-TDD通信系统竞争随机接入过程的实现,无线终端在LTE-TDD系统中的接入成功率得到了很大程度的提高,并且终端与基站之间的链路的稳定性和可靠性也得到很好的改善。
[Abstract]:With the continuous development and application of wireless broadband technology, the technology of LTE (Long Term Evolution, long term evolution) is becoming mature, and has entered the final implementation stage of commercial access debugging. The many protocol characteristics of LTE tend to be unified, and random access function is an important work for the realization of terminal broadband access. Yes, its implementation is the most basic and most important performance index for LTE 4G network. For the specific implementation of LTE random access functions, each device manufacturer is different, mainly in the layer one (PHY layer) and layer two (MAC layer), the realization of the difference is relatively large. Based on this reason, a more reasonable, interconnected interoperability needs to be proposed. A strong implementation scheme, and the need to test to verify the rationality and correctness of the random access function.LTE to achieve the goal is under the different bandwidth conditions such as 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20M, under the bandwidth conditions, can achieve the downlink high rate. In order to achieve LTE Technology, it can make wireless signals stable. The fixed, accurate access to the LTE system and the normal work have become an important measure of the stability of the LTE system. When the LTE communication system is realized, the LTE protocol stack is run on the Linux operating system platform, and the.LTE communication system can be divided into frequency division on the Linux platform. There are two kinds of duplex multiplexing (FDD) and time division duplex multiplexing (TDD). The focus of this paper is on the communication system of LTE-TDD, and how to convert the random access protocol of 3GPP into the random access function of the LTE-TDD communication system, and can make the random access work fully present in the LTE communication system, and then be able to follow the LTE-TDD random access system. The realization of the machine access function is effective and scientific. At the same time, the implementation of random access and the empty protocol are also introduced. Finally, the improvement ideas and the development direction are put forward. Some work is done for the realization and verification of the random access function in the LTE-TDD communication system: 1. for the 3GPP protocol In this paper, the random access function is understood and analyzed. This paper analyzes and understands the random access function of 3GPP, and designs a set of scientific random access implementation scheme based on the characteristics of the random access process referring to the characteristics of the LTE-TDD communication system, which is designed for the design of the competitive random access process in the LTE-TDD system, and the design of the random access process in the system is designed, and the design of the random access process in the 3GPP system is designed. And divide the random into two parts: the design and access process of the physical random access channel in the medium access control layer of LTE-TDD, the design phase of the medium access control layer is mainly the function module of layer two, and the function of these functional modules in the system is detailed. This paper introduces.3. to implement the competitive random access process in the 3GPP protocol in the real LTE-TDD system, and translates into the competitive random access process function in the TLE-TDD system according to the message signaling interaction of the competitive random access process in the 3GPP protocol. The functions and principles of the work are also explained in detail. And the specific definition of message signaling for each competitive random access process and the implementation of.4. for the competitive random access process implemented in the real LTE-TDD system are scientifically tested and verified. At the same time, some of the definitions defined in the 3GPP protocol are compared. The message parameters of the competitive random access process are tested and verified. Finally, it is proved that the random access process can achieve.5. through the implementation of the competitive random access process of the LTE-TDD communication system in the real LTE-TDD system. The access success rate of the wireless terminal in the LTE-TDD system has been greatly improved, and the terminal and the base station The link stability and reliability have also been improved.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2118690
[Abstract]:With the continuous development and application of wireless broadband technology, the technology of LTE (Long Term Evolution, long term evolution) is becoming mature, and has entered the final implementation stage of commercial access debugging. The many protocol characteristics of LTE tend to be unified, and random access function is an important work for the realization of terminal broadband access. Yes, its implementation is the most basic and most important performance index for LTE 4G network. For the specific implementation of LTE random access functions, each device manufacturer is different, mainly in the layer one (PHY layer) and layer two (MAC layer), the realization of the difference is relatively large. Based on this reason, a more reasonable, interconnected interoperability needs to be proposed. A strong implementation scheme, and the need to test to verify the rationality and correctness of the random access function.LTE to achieve the goal is under the different bandwidth conditions such as 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20M, under the bandwidth conditions, can achieve the downlink high rate. In order to achieve LTE Technology, it can make wireless signals stable. The fixed, accurate access to the LTE system and the normal work have become an important measure of the stability of the LTE system. When the LTE communication system is realized, the LTE protocol stack is run on the Linux operating system platform, and the.LTE communication system can be divided into frequency division on the Linux platform. There are two kinds of duplex multiplexing (FDD) and time division duplex multiplexing (TDD). The focus of this paper is on the communication system of LTE-TDD, and how to convert the random access protocol of 3GPP into the random access function of the LTE-TDD communication system, and can make the random access work fully present in the LTE communication system, and then be able to follow the LTE-TDD random access system. The realization of the machine access function is effective and scientific. At the same time, the implementation of random access and the empty protocol are also introduced. Finally, the improvement ideas and the development direction are put forward. Some work is done for the realization and verification of the random access function in the LTE-TDD communication system: 1. for the 3GPP protocol In this paper, the random access function is understood and analyzed. This paper analyzes and understands the random access function of 3GPP, and designs a set of scientific random access implementation scheme based on the characteristics of the random access process referring to the characteristics of the LTE-TDD communication system, which is designed for the design of the competitive random access process in the LTE-TDD system, and the design of the random access process in the system is designed, and the design of the random access process in the 3GPP system is designed. And divide the random into two parts: the design and access process of the physical random access channel in the medium access control layer of LTE-TDD, the design phase of the medium access control layer is mainly the function module of layer two, and the function of these functional modules in the system is detailed. This paper introduces.3. to implement the competitive random access process in the 3GPP protocol in the real LTE-TDD system, and translates into the competitive random access process function in the TLE-TDD system according to the message signaling interaction of the competitive random access process in the 3GPP protocol. The functions and principles of the work are also explained in detail. And the specific definition of message signaling for each competitive random access process and the implementation of.4. for the competitive random access process implemented in the real LTE-TDD system are scientifically tested and verified. At the same time, some of the definitions defined in the 3GPP protocol are compared. The message parameters of the competitive random access process are tested and verified. Finally, it is proved that the random access process can achieve.5. through the implementation of the competitive random access process of the LTE-TDD communication system in the real LTE-TDD system. The access success rate of the wireless terminal in the LTE-TDD system has been greatly improved, and the terminal and the base station The link stability and reliability have also been improved.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
【参考文献】
相关期刊论文 前1条
1 孙媛;4G通信系统关键技术初探[J];电信工程技术与标准化;2004年04期
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