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LTE PRACH参数配备分析 目录目录31引言41.1编写目的41.2文档组织41.3预期读者和阅读建议41.4参照资料41.5缩写术语和常用符号42PRACH信道的配备分析62.1PRACH信道的配备参数62.1.1PRACH配备索引（prach-ConfigurationIndex）62.1.2零有关配备（zeroCorrelationZoneConfig）142.1.3根序列索引（rootSequenceIndex）182.1.4与否为高速状态（highSpeedFlag）212.1.5频率偏移（prach-FrequencyOffset）222.2PRACH信道的参数的配备措施232.2.1PRACH信道参数的配备环节232.2.2邻社区的PRACH信道的配备233LTE典型 PRACH配备243.1Format 0时 PRACH信道的参数的配备243.1.1密度为1状况下PRACH有关参数配备243.1.2密度为2状况下PRACH有关参数配备263.2Format 4时 PRACH信道的参数的配备274高速模式下配备原则295附录325.1南京规模实验网站址分布图321 引言1.1 编写目的本文档的编写目的是分析PRACH信道的各参数的配备措施及各邻区间如何进行配备。1.2 文档组织本文一方面对LTE3.0版本需要配备的PRACH信道的各参数进行了阐明和描述，根据网络规划如何拟定各参数的取值，并给出相邻社区各参数的配备原则。本文在第2章的后半部分给出了PRACH各参数的配备措施和环节。第3章给出了高速模式下的零有关和根序列的配备有一定的关联关系。1.3 预期读者和阅读建议本文档的预期读者为LTE网络建设人员和LTE网络优化人员、测试人员等。1.4 参照资料1. LTE无线配备参数分析.doc V1.12. LTE PRACH密度需求分析.docV1.03. LTEUMTS长期演进理论与实践马霓、邬钢等译4. 3GPP TS 36.211 Physical Channels and Modulation 1.5 缩写术语和常用符号英文缩写英文全称中文全称CMCubic Metric立方量度PAPRPeak-to-Average Power Ratio峰均值功率比PRACHPhysical Random Access Channel物理随机接入信道RACHRandom Access Channel随机接入信道2 PRACH信道的配备分析2.1 PRACH信道的配备参数LTE 中PRACH信道的配备参数重要有五个，都是社区级参数分别是： PRACH配备索引（prach-ConfigurationIndex） 零有关配备（zeroCorrelationZoneConfig） 根序列索引（rootSequenceIndex） 与否为高速状态（highSpeedFlag） 频率偏移（prach-FrequencyOffset）2.1.1 PRACH配备索引（prach-ConfigurationIndex）2.1.1.1 参数基本信息参数编号取值范畴物理单位调节步长0.63默认值：51无无参数名称传送途径作用范畴参数出处prach-ConfigurationIndexeNodeB-UECell36.211所属网元及设立途径社区逻辑无线资源参数-物理随机接入信道- PRACH配备索引不同场景下的差别化配备阐明无用于批示社区的PRACH配备索引。该参数批示了PRACH的频域资源索引、时域的无线帧、半帧、子帧的资源占用状况。该参数拟定后，社区PRACH的时、频资源即可拟定，同步也拟定了采用的前导格式（047为前导格式03，4757为前导格式4），其定义见下表（36.211 Table 5.7.1-4）。PRACH configuration Index(See Table 5.7.1-3)UL/DL configuration (See Table 4.2-2)01234560(0,1,0,2)(0,1,0,1)(0,1,0,0)(0,1,0,2)(0,1,0,1)(0,1,0,0)(0,1,0,2)1(0,2,0,2)(0,2,0,1)(0,2,0,0)(0,2,0,2)(0,2,0,1)(0,2,0,0)(0,2,0,2)2(0,1,1,2)(0,1,1,1)(0,1,1,0)(0,1,0,1)(0,1,0,0)N/A(0,1,1,1)3(0,0,0,2)(0,0,0,1)(0,0,0,0)(0,0,0,2)(0,0,0,1)(0,0,0,0)(0,0,0,2)4(0,0,1,2)(0,0,1,1)(0,0,1,0)(0,0,0,1)(0,0,0,0)N/A(0,0,1,1)5(0,0,0,1)(0,0,0,0)N/A(0,0,0,0)N/AN/A(0,0,0,1)6(0,0,0,2)(0,0,1,2)(0,0,0,1)(0,0,1,1)(0,0,0,0)(0,0,1,0)(0,0,0,1)(0,0,0,2)(0,0,0,0)(0,0,0,1)(0,0,0,0)(1,0,0,0)(0,0,0,2)(0,0,1,1)7(0,0,0,1)(0,0,1,1)(0,0,0,0)(0,0,1,0)N/A(0,0,0,0)(0,0,0,2)N/AN/A(0,0,0,1)(0,0,1,0)8(0,0,0,0)(0,0,1,0)N/AN/A(0,0,0,0)(0,0,0,1)N/AN/A(0,0,0,0)(0,0,1,1)9(0,0,0,1)(0,0,0,2)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,0,0)(0,0,0,1)(1,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,1)10 (0,0,0,0)(0,0,1,0) (0,0,1,1) (0,0,0,1)(0,0,1,0) (0,0,1,1) (0,0,0,0)(0,0,1,0) (1,0,1,0)N/A(0,0,0,0)(0,0,0,1)(1,0,0,0)N/A (0,0,0,0)(0,0,0,2)(0,0,1,0)11N/A(0,0,0,0) (0,0,0,1)(0,0,1,0)N/AN/AN/AN/A (0,0,0,1)(0,0,1,0)(0,0,1,1)12(0,0,0,1)(0,0,0,2)(0,0,1,1)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,2)(0,0,0,0)(0,0,0,1)(1,0,0,0)(1,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)13(0,0,0,0)(0,0,0,2)(0,0,1,0)(0,0,1,2)N/AN/A(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,1)N/AN/A(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,1)14(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)N/AN/A(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,0)N/AN/A(0,0,0,0)(0,0,0,2)(0,0,1,0)(0,0,1,1)15(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,1)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(1,0,0,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(2,0,0,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,1)(1,0,0,2)(0,0,0,0)(0,0,0,1)(1,0,0,0)(1,0,0,1)(2,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)(4,0,0,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)16(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(1,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(2,0,1,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,0)(1,0,0,2)(0,0,0,0)(0,0,0,1)(1,0,0,0)(1,0,0,1)(2,0,0,0)N/AN/A17(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(1,0,0,0)N/A(0,0,0,0)(0,0,0,1)(0,0,0,2) (1,0,0,0)(1,0,0,1)N/AN/AN/A18(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)(0,0,1,2)(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(1,0,0,1)(1,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(2,0,0,0)(2,0,1,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(1,0,0,0)(1,0,0,1)(1,0,0,2)(0,0,0,0)(0,0,0,1)(1,0,0,0)(1,0,0,1)(2,0,0,0)(2,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)(4,0,0,0)(5,0,0,0)(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)(1,0,0,2)19N/A(0,0,0,0)(0,0,0,1)(0,0,1,0)(0,0,1,1)(1,0,0,0)(1,0,1,0)N/AN/AN/AN/A(0,0,0,0)(0,0,0,1)(0,0,0,2)(0,0,1,0)(0,0,1,1)(1,0,1,1)20 / 30(0,1,0,1)(0,1,0,0)N/A(0,1,0,1)(0,1,0,0)N/A(0,1,0,1)21 / 31(0,2,0,1)(0,2,0,0)N/A(0,2,0,1)(0,2,0,0)N/A(0,2,0,1)22 / 32(0,1,1,1)(0,1,1,0)N/AN/AN/AN/A(0,1,1,0)23 / 33(0,0,0,1)(0,0,0,0)N/A(0,0,0,1)(0,0,0,0)N/A(0,0,0,1)24 / 34(0,0,1,1)(0,0,1,0)N/AN/AN/AN/A(0,0,1,0)25 / 35(0,0,0,1)(0,0,1,1)(0,0,0,0)(0,0,1,0)N/A(0,0,0,1)(1,0,0,1)(0,0,0,0)(1,0,0,0)N/A(0,0,0,1)(0,0,1,0)26 / 36(0,0,0,1)(0,0,1,1)(1,0,0,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)N/A(0,0,0,1)(1,0,0,1)(2,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)N/A(0,0,0,1)(0,0,1,0)(1,0,0,1)27 / 37(0,0,0,1)(0,0,1,1)(1,0,0,1)(1,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)N/A(0,0,0,1)(1,0,0,1)(2,0,0,1)(3,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)N/A(0,0,0,1)(0,0,1,0)(1,0,0,1)(1,0,1,0)28 / 38(0,0,0,1)(0,0,1,1)(1,0,0,1)(1,0,1,1)(2,0,0,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(2,0,0,0)N/A(0,0,0,1)(1,0,0,1)(2,0,0,1)(3,0,0,1)(4,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)(4,0,0,0)N/A(0,0,0,1)(0,0,1,0)(1,0,0,1)(1,0,1,0)(2,0,0,1)29 /39(0,0,0,1)(0,0,1,1)(1,0,0,1)(1,0,1,1)(2,0,0,1)(2,0,1,1)(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)(2,0,0,0)(2,0,1,0)N/A(0,0,0,1)(1,0,0,1)(2,0,0,1)(3,0,0,1)(4,0,0,1)(5,0,0,1)(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)(4,0,0,0)(5,0,0,0)N/A(0,0,0,1)(0,0,1,0)(1,0,0,1)(1,0,1,0)(2,0,0,1)(2,0,1,0)40(0,1,0,0)N/AN/A(0,1,0,0)N/AN/A(0,1,0,0)41(0,2,0,0)N/AN/A(0,2,0,0)N/AN/A(0,2,0,0)42(0,1,1,0)N/AN/AN/AN/AN/AN/A43(0,0,0,0)N/AN/A(0,0,0,0)N/AN/A(0,0,0,0)44(0,0,1,0)N/AN/AN/AN/AN/AN/A45(0,0,0,0)(0,0,1,0)N/AN/A(0,0,0,0)(1,0,0,0)N/AN/A(0,0,0,0)(1,0,0,0)46(0,0,0,0)(0,0,1,0)(1,0,0,0)N/AN/A(0,0,0,0)(1,0,0,0)(2,0,0,0)N/AN/A(0,0,0,0)(1,0,0,0)(2,0,0,0)47(0,0,0,0)(0,0,1,0)(1,0,0,0)(1,0,1,0)N/AN/A(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)N/AN/A(0,0,0,0)(1,0,0,0)(2,0,0,0)(3,0,0,0)48(0,1,0,*)(0,1,0,*)(0,1,0,*)(0,1,0,*)(0,1,0,*)(0,1,0,*)(0,1,0,*)49(0,2,0,*)(0,2,0,*)(0,2,0,*)(0,2,0,*)(0,2,0,*)(0,2,0,*)(0,2,0,*)50(0,1,1,*)(0,1,1,*)(0,1,1,*)N/AN/AN/A(0,1,1,*)51(0,0,0,*)(0,0,0,*)(0,0,0,*)(0,0,0,*)(0,0,0,*)(0,0,0,*)(0,0,0,*)52(0,0,1,*)(0,0,1,*)(0,0,1,*)N/AN/AN/A(0,0,1,*)53(0,0,0,*)(0,0,1,*)(0,0,0,*)(0,0,1,*)(0,0,0,*)(0,0,1,*)(0,0,0,*)(1,0,0,*)(0,0,0,*)(1,0,0,*)(0,0,0,*)(1,0,0,*)(0,0,0,*)(0,0,1,*)54(0,0,0,*)(0,0,1,*)(1,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)55(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)56(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)57(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(2,0,1,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(2,0,1,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(2,0,1,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(5,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(5,0,0,*)(0,0,0,*)(1,0,0,*)(2,0,0,*)(3,0,0,*)(4,0,0,*)(5,0,0,*)(0,0,0,*)(0,0,1,*)(1,0,0,*)(1,0,1,*)(2,0,0,*)(2,0,1,*)58N/AN/AN/AN/AN/AN/AN/A59N/AN/AN/AN/AN/AN/AN/A60N/AN/AN/AN/AN/AN/AN/A61N/AN/AN/AN/AN/AN/AN/A62N/AN/AN/AN/AN/AN/AN/A63N/AN/AN/AN/AN/AN/AN/A表格中的含义如下：在prach-FrequencyOffset的基本上批示同一时刻内频分的各个PRACH信道的频率位置；：批示PRACH信道的无线帧位置，0为所有无线帧，1为奇数无线帧，2为偶数无线帧；：批示PRACH信道在无线帧的前半帧或后半帧，0为前半帧，1为后半帧；：批示PRACH信道在“5ms半帧”内的上子帧序号，带*表达在UpPTS上。2.1.1.2 前导码格式与社区半径的关系 随机接入信号是由CP（长度为TCP）、前导序列（长度为TSEQ）和GT (长度为)三个部分构成，前导序列与PRACH时隙长度的差为GT，用于对抗多径干扰的保护，以抵消传播时延。一般来说较长的序列，能获得较好的覆盖范畴，但较好的覆盖范畴需要较长的CP和GT来抵消相应的来回时延，即社区覆盖范畴越大，传播时延越长，需要的GT越大，为适应不同的覆盖规定，36.211合同规定了五种格式的PRACH 循环前缀长度、序列长度、以及GT长度如下表3。Preamble格式和社区覆盖范畴的关系约束原则为：社区内边沿顾客的传播时延需要在GT内部，才干保证PRACH能正常接受，且不干扰其她的子帧。即需要满足的关系为 ，其中，TTCP 为循环前缀CP的长度； TGT为保护间隔；TRTT为最大来回时间。根据以上关系，可以得到多种格式下所支持社区的最大半径(考虑)如表3：表3前导格式CP长度(Ts/)GT长度()03168/103.132976/96.886.2514.53121024/684.3815840/515.6316.6777.3426240/203.136048/196.886.2529.53321024/684.3821984/715.6316.67100.164448/14.583288/9.37551.406具体可以论述为：Preamble 格式 0：持续1ms，序列长度800us，合用于小、中型的社区，最大社区半径14.53km，此格式看满足网络覆盖的多数场景。Preamble 格式 1：持续2ms，序列长度800us，合用于大型的社区，最大社区半径为77.34km。Preamble 格式 2：持续2ms，序列长度1600us，合用于中型社区，最大社区半径为29.53km。Preamble 格式 3：持续3ms，序列长度1600us，合用于超大型社区，最大社区半径为100.16km；一般用于海面、孤岛等需要超长距离覆盖的场景。Preamble 格式 4： TDD模式专用的格式，持续时间157.292s（ 2个OFDM符号的突发），合用于小型社区，社区半径1.4km，一般应用于短距离覆盖，特别是密集市区、室内覆盖或热点补充覆盖等场景。它是对半径较小的社区的一种优化，可以在不占用正常时隙资源的状况下，运用很小的资源承载PRACH信道，有助于提高系统上行吞吐量，某种限度上也可以觉得有助于提高上行业务信道的覆盖性能。2.1.1.3 RACH容量选择这里用一种简朴的模型来估计有限的PRACH资源上的竞争随机接入顾客的承载数量。设定在某时间间隔中需要进行随机接入顾客数为（顾客数足够大，即顾客间），随机接入的资源数为（随机接入的资源数由PRACH的密度决定。m表达每10ms内的preambles码数preambles），顾客等概率地选择这些资源中的一种，任一顾客A的碰撞概率为。顾客发生碰撞后，重新进行随机接入时，在这个简朴模型中记为一种新顾客的接入，则任一顾客A选定资源集（共个资源）中某一资源时，其他顾客不和该顾客发生碰撞，即其他顾客都选择其她个资源，其概率约为。即顾客A不和其她顾客发生碰撞的概率为：时间间隔T内，随机接入的顾客数N表达为：从上式可以看出，一定PRACH密度状况下，目的碰撞概率对所支持的随机接入的顾客数需求起决定作用。设定顾客可以接受的碰撞概率=1%（在LTE中，检测到碰撞后就可以使用回退机制），一种PRACH资源（一种1.08MHz带宽的时频资源）中的64Preambles均用于竞争随机接入，则一种PRACH资源可以接入的顾客数个。如果一种无线帧（10ms）内有两个PRACH资源（即密度为2），则每秒钟可以接入的顾客数为个。这就是LTE中盼望的典型PRACH负载能力。下面两幅图是3GPP有关提案中给出的不同RACH负载下的碰撞概率曲线，其中第二幅图是对第一幅图在碰撞概率低于1%时的缩放。途中横坐标表达1s中内发起RACH的总次数（竞争式），纵坐标表达碰撞概率，64signatures表达10ms周期内共有64个preamble可用，128signatures表达共有128个preamble可用。从第一幅图可以看出如果目的碰撞概率设为低于1%，则每10ms128个preamble可以支持200次/s的竞争式随机接入。进一步考虑将随机接入辨别为竞争式的和非竞争式两种状况，为非竞争式随机接入预留preamble。提案R2-070205中给出在假设的话务模型下，社区竞争式随后接入负载和非竞争式随机接入负载随社区覆盖范畴内UE数变化而变化的状况，如下图所示。1000300040005000600070008000900010000aRACH load12.224.436.748.961.173.385.697.8110.0122.2load for dedicated signatures9.719.429.238.948.658.368.177.887.597.2虽然预留会导致竞争式的preamble个数的减少，但是由于可以通过度派的方式避免碰撞，preamble的使用效率会得到提高。以7000个UE时非竞争随机接入的负载是68.1 access/second为例，这个负载由如下三部分构成：- Call establishment (RT): 1.9- Handover (RT): 8.8 - Handover (NRT): 58.3假设为了切换时可以采用一种异步的措施，一种相似的preamble应当在后续持续5个时刻上被保存，而下行资源分派（下行数据达到）只是需要在1个随机接入时刻上1个专用preamble即可。因此可以采用一种因子5修正切换时的非竞争随机接入负载，从而得到总的非竞争式随机接入负载为： access/second，或者3.37/occasion（假设10ms inter-occasion period）。进一步假设： 平均需要分派3.37个专用preamble 每个随机接入时刻的preamble需求达到满足Poisson分布 可以接受的专用preamble消耗完的概率是0.5%满足1- P0 P1- Px UECell36.211所属网元及设立途径社区逻辑无线资源参数-物理随机接入信道-零有关配备不同场景下的差别化配备阐明无2）功能描述 该参数批示PRACH前导序列生成使用的循环移位配备的索引值，如下表3（36.211 Table 5.7.2-2:）、表4（Table 5.7.2-3），对于前导格式0-3，本参数的取值范畴为0-15，对于前导格式4，本参数的取值范畴为0-6， “unrestricted set”或“restricted set”参数“与否为高速状态”由2.1.4节的“与否为高速状态（highSpeedFlag）”批示。表3 for preamble generation (preamble formats 0-3).zeroCorrelationZoneConfig valueUnrestricted setRestricted set00151131821522318264223252638632467385584668959821076100119312812119158131672021427923715419-表4: for preamble generation (preamble format 4).zeroCorrelationZoneConfig value021426384105126157N/A8N/A9N/A10N/A11N/A12N/A13N/A14N/A15N/A2.1.2.2 Ncs与社区半径的关系Ncs与社区半径有关，下面是Ncs和社区半径的关系参见如下公式： （公式1）其中，对于前导格式0-3，对于前导格式4，；对于前导格式0-3，对于前导格式4，；为最大多径时延扩展，是社区边沿UE对抗多径干扰的保护；为光速。原则上，Ncs越大，社区半径越大，如下是根据公式1计算获得的前导格式0-3 、前导格式4，Ncs数值及其相应的最大社区半径(假设)关系表。表5 前导格式03 时Ncs值与支持的最大社区半径zeroCorrelationZoneConfigUnrestricted setRestricted set社区半径社区半径00 119.1km15 1.4km113 1.0 km18 1.7 km215 1.3 km222.3 km318 1.7 km262.9 km422 2.3 km323.8 km526 2.8 km384.6 km632 3.7 km465.8 km738 4.5 km557.1 km846 5.7 km688.9 km959 7.5 km8210.9 km1076 10 km10013.5 km1193 12.4 km12817.5 km12119 16.1 km15821.8 km13167 23 km20228.1 km14279 39 km23733.1 km15419 59 km-前导格式4Ncs值与支持的最大社区半径表（考虑Tds = 5us）表6 前导格式4时Ncs值与支持的最大社区半径zeroCorrelationZoneConfig社区半径02 NA14 NA26 81m38 369m410 657m512 945m615 1376m注：最大扩展时延Tds临时按照5us考虑， 若后期有更合理的值，则再更新文档。2.1.2.3 低速状况下产生64个前导码需要的根序列个数 （公式2）其中,K表达根序列的个数；前导格式0-3，对于前导格式4，；64表达64个前导码；根据公式2，计算出低速（非限制集）状况下产生64个前导码需要的根序列数，如表6。 表6 Ncs值和产生64个前导需要的根序列数 配备值(非限制集)产生64个前导非限制集需要的根序列个数006411312152318242225262632373838464959510766119381211910131671314279221541932表10 Format 4格式下的根序列zeroCorrelationZoneConfig产生64个前导非限制集需要的根序列个数02 114 126 138 1410 1512 1615 22.1.2.4 相邻社区间零有关配备参数的配备原则半径相似的社区可以Ncs相似，即“零有关配备（zeroCorrelationZoneConfig）”参数配备相似。2.1.3 根序列索引（rootSequenceIndex）2.1.3.1 参数基本信息参数编号取值范畴物理单位调节步长0.837（format4 时0137）默认值：0无无参数名称传送途径作用范畴参数出处rootSequenceIndexeNodeB-UECell36.211所属网元及设立途径社区逻辑无线资源参数-物理随机接入信道-根序列索引不同场景下的差别化配备阐明无社区可用的64个前导集合是由一种或多种根Zadoff-Chu序列（简称ZC序列）进行循环移位产生的，社区使用的根序列的起始根序列的逻辑序号由本参数进行配备，参见表9（36.211 的Table 5.7.2-4）、表10（36.211 的Table 5.7.2-5），在系统信息中进行广播。系统共使用838个ZC序列作为前导的物理根序列，合同中根据高速模式下各个物理根序列u所支持的最大的进行了分组，使得同一组内的Ncs满足NCS（g）NCS_maxNCS(g+1)（g为组号），共分为32个序列组，每组中的根序列按照CM值(CM是上行功率放大器非线性影响的衡量原则，比PAPR更精确，直接表征功放功率的减少称为功率退化的限度，CM越低，对射频硬件规定比较低)排序，位置持续的根序列CM值始终接近，可以实现一致的社区覆盖，重新排序后的根序列序号称为根序列的逻辑序号。根据CM值的大小将838个序列可以分为低CM组和高CM 组。根序列逻辑序号0455为低CM组，根序列逻辑序号456837为高CM组，CM值越低，越有助于社区覆盖因此低CM值的根序列优先使用。表9 Format03格式下的根序列Logical root sequence numberPhysical root sequence number (in increasing order of the corresponding logical sequence number)023129, 710, 140, 699, 120, 719, 210, 629, 168, 671, 84, 755, 105, 734, 93, 746, 70, 769, 60, 7792, 837, 1, 838242956, 783, 112, 727, 148, 691303580, 759, 42, 797, 40, 799364135, 804, 73, 766, 146, 693425131, 808, 28, 811, 30, 809, 27, 812, 29, 810526324, 815, 48, 791, 68, 771, 74, 765, 178, 661, 136, 703647586, 753, 78, 761, 43, 796, 39, 800, 20, 819, 21, 818768995, 744, 202, 637, 190, 649, 181, 658, 137, 702, 125, 714, 151, 68890115217, 622, 128, 711, 142, 697, 122, 717, 203, 636, 118, 721, 110, 729, 89, 750, 103, 736, 61, 778, 55, 784, 15, 824, 14, 82511613512, 827, 23, 816, 34, 805, 37, 802, 46, 793, 207, 632, 179, 660, 145, 694, 130, 709, 223, 616136167228, 611, 227, 612, 132, 707, 133, 706, 143, 696, 135, 704, 161, 678, 201, 638, 173, 666, 106, 733, 83, 756, 91, 748, 66, 773, 53, 786, 10, 829, 9, 8301682037, 832, 8, 831, 16, 823, 47, 792, 64, 775, 57, 782, 104, 735, 101, 738, 108, 731, 208, 631, 184, 655, 197, 642, 191, 648, 121, 718, 141, 698, 149, 690, 216, 623, 218, 621204263152, 687, 144, 695, 134, 705, 138, 701, 199, 640, 162, 677, 176, 663, 119, 720, 158, 681, 164, 675, 174, 665, 171, 668, 170, 669, 87, 752, 169, 670, 88, 751, 107, 732, 81, 758, 82, 757, 100, 739, 98, 741, 71, 768, 59, 780, 65, 774, 50, 789, 49, 790, 26, 813, 17, 822, 13, 826, 6, 8332643275, 834, 33, 806, 51, 788, 75, 764, 99, 740, 96, 743, 97, 742, 166, 673, 172, 667, 175, 664, 187, 652, 163, 676, 185, 654, 200, 639, 114, 725, 189, 650, 115, 724, 194, 645, 195, 644, 192, 647, 182, 657, 157, 682, 156, 683, 211, 628, 154, 685, 123, 716, 139, 700, 212, 627, 153, 686, 213, 626, 215, 624, 150, 689328383225, 614, 224, 615, 221, 618, 220, 619, 127, 712, 147, 692, 124, 715, 193, 646, 205, 634, 206, 633, 116, 723, 160, 679, 186, 653, 167, 672, 79, 760, 85, 754, 77, 762, 92, 747, 58, 781, 62, 777, 69, 770, 54, 785, 36, 803, 32, 807, 25, 814, 18, 821, 11, 828, 4, 8353844553, 836, 19, 820, 22, 817, 41, 798, 38, 801, 44, 795, 52, 787, 45, 794, 63, 776, 67, 772, 72767, 76, 763, 94, 745, 102, 737, 90, 749, 109, 730, 165, 674, 111, 728, 209, 630, 204, 635, 117, 722, 188, 651, 159, 680, 198, 641, 113, 726, 183, 656, 180, 659, 177, 662, 196, 643, 155, 684, 214, 625, 126, 713, 131, 708, 219, 620, 222, 617, 226, 613456513230, 609, 232, 607, 262, 577, 252, 587, 418, 421, 416, 423, 413, 426, 411, 428, 376, 463, 395, 444, 283, 556, 285, 554, 379, 460, 390, 449, 363, 476, 384, 455, 388, 451, 386, 453, 361, 478, 387, 452, 360, 479, 310, 529, 354, 485, 328, 511, 315, 524, 337, 502, 349, 490, 335, 504, 324, 515514561323, 516, 320, 519, 334, 505, 359, 480, 295, 544, 385, 454, 292, 547, 291, 548, 381, 458, 399, 440, 380, 459, 397, 442, 369, 470, 377, 462, 410, 429, 407, 432, 281, 558, 414, 425, 247, 592, 277, 562, 271, 568, 272, 567, 264, 575, 259, 580
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