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l14107cb 发表于 2024-8-31 04:05:51

LTE网络RF优化之前台测试基本知识

    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;">新人进入通信行业，其中大部分一<span style="color: black;">起始</span>做的工作<span style="color: black;">便是</span>路测（DT和CQT<strong style="color: blue;">测试</strong>），这就需要通信新人<span style="color: black;">把握</span>基本的测试参数和理论知识，能够分析最简单的问题，下面我将这些基本参数和路测中<span style="color: black;">平常</span>问题做一简单介绍。</strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;">本章<span style="color: black;">重点</span>介绍路测基本知识（<span style="color: black;">包括</span>参数）</strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTMO4NZNC2aOOP07qbXOrxEjY7ib5YjJvicSKdApT9tbPJnzpydbC9FicYA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;">1、LTE频段</strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTUe0SEQxBMbd43J6jXVHe1NHy8orULpaxbJfCj9KeHQJbrM6YTDaUicA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">2、<span style="color: black;">RSRP/RSSI/RSRQ/<span style="color: black;">SINR</span></span></span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><span style="color: black;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTViaIDk5fr6bJibjGgG9Z12msnIkxNaVRMCTljv6Y3ELrlWI1jzYgc0Dg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></span></span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1)RSRP</span><span style="color: black;">（</span><span style="color: black;">Reference Signal Receiving Power</span><span style="color: black;">）是在某个</span><span style="color: black;">Symbol</span><span style="color: black;">内承载</span><span style="color: black;">Reference Signal</span><span style="color: black;">的所有</span><span style="color: black;">RE</span><span style="color: black;">上接收到的信号功率的平均值；</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2)RSSI（<span style="color: black;">Received Signal Strength Indicator</span>）则是在这个<span style="color: black;">Symbol</span>内接收到的所有信号（<span style="color: black;">包含</span>导频信号和数据信号，邻区干扰信号，噪音信号等）功率的平均值；</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">3)RSRQ(Reference Signal Receiving Quality)则是<span style="color: black;">RSRP</span>和<span style="color: black;">RSSI</span>的比值，当然<span style="color: black;">由于</span>两者<span style="color: black;">测绘</span>所基于的带宽可能<span style="color: black;">区别</span>，会用一个系数来<span style="color: black;">调节</span>，<span style="color: black;">亦</span><span style="color: black;">便是</span> <span style="color: black;">RSRQ = N*RSRP/RSSI<span style="color: black;">；</span></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">RSRP 指示了想要的信号强度，而<span style="color: black;">RSRQ</span>，<span style="color: black;">因为</span>引入了<span style="color: black;">RSSI, </span><span style="color: black;">因此</span>还额外<span style="color: black;">思虑</span>了干扰水平<span style="color: black;">；</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">4)</span>SINR<span style="color: black;">：信号与干扰加噪声比，是接收到的有用信号的强度与接收到的干扰信号（噪声和干扰）的强度比值。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">3、<span style="color: black;">MCS/CQI</span></span></strong></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTP6IHHFzicUko5O5O0KvjRek6nG9ZUx8EEB3jtgzJ7pKoglV7EWQgIeg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTpIGkARtDnXgEOcnLYAQ9kA9mnkxibg3tTascHafnugtEh6guQeBI74g/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">MCS（Modulation and Coding Scheme，调制与编码策略；</span><span style="color: black;">LTE</span><span style="color: black;">（</span><span style="color: black;">3.9G</span><span style="color: black;">）中下行调制有</span><span style="color: black;">3</span><span style="color: black;">中：</span><span style="color: black;">QPSK</span><span style="color: black;">（</span><span style="color: black;">1</span><span style="color: black;">个相位有</span><span style="color: black;">2</span><span style="color: black;">个信息）、</span><span style="color: black;">16QAM</span><span style="color: black;">（</span><span style="color: black;">1</span><span style="color: black;">个相位有</span><span style="color: black;">4</span><span style="color: black;">个信息）和</span><span style="color: black;">64QAM(1</span><span style="color: black;">个相位有</span><span style="color: black;">6</span><span style="color: black;">个信息）</span><span style="color: black;">,</span><span style="color: black;">采用</span><span style="color: black;">64QAM</span><span style="color: black;">调制，速率高，它是<span style="color: black;">按照</span>无线环境自动<span style="color: black;">选取</span>编码调制的。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">调度的最高阶是28，对应是64QAM&nbsp;，调用的阶数高，说明速率高，调用阶数低则是速率低，<span style="color: black;">详细</span>的阶数对应的编码调制，<span style="color: black;">能够</span>查看DL PCC Code1 Modulation。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">29对应是QPSK的误码率，30对应的是16QAM的误码率，31对应的是64QAM的误码率。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTHxVicU2RXHSRjOmuEne6YXL5XicZ3JyBRicOOKqr5SLnEPxicsU0B15rTg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CQI是信道质量指示，英文全<span style="color: black;">叫作</span>channel quality indication，CQI由UE<span style="color: black;">测绘</span>所得，<span style="color: black;">因此</span><span style="color: black;">通常</span><span style="color: black;">指的是</span>下行信道质量。（即UE<span style="color: black;">测绘</span>后上报）</span><span style="color: black;">编码方式越高（QPSK&lt;16QAM&lt;64QAM），依赖的信道<span style="color: black;">要求</span>需要越好，<span style="color: black;">因此</span>在好点的</span><span style="color: black;">CQI</span><span style="color: black;">会高于差点。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">4、<span style="color: black;">BLER</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTzGaocFqSKdEJlolUygEzEact7MLnE93tYmk977NgnswHBjgQhnSPJA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">BLER（block error rate），即误块率，是出错的块在所有发送的块中所占的百分比（只计算初传的block）。在<span style="color: black;">实质</span>应用中，某一特定百分比（如：LTE中数据信道的BLER<span style="color: black;">需求</span>为10%以下）的BLER并不总是必须的，<span style="color: black;">由于</span><span style="color: black;">能够</span>重传出错的块并<span style="color: black;">经过</span>特殊的处理（如软合并等），使得接收端正确解出收到的数据。需要<span style="color: black;">测绘</span>和计算BLER时，在发送端就能够完成，<span style="color: black;">由于</span><span style="color: black;">能够</span><span style="color: black;">经过</span>收到的NACK数来计算BLER。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">在LTE中，<span style="color: black;">掌控</span>信道的<span style="color: black;">目的</span>BLER为1%，数据信道的<span style="color: black;">目的</span>BLER位10%。当BLER不超过10%时，UE将向eNodeB上报它所能解码的最高MCS。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">LTE在无HARQ重传<span style="color: black;">状况</span>下误块率指标为10%，加入HARQ重传后误帧率（FER）大概为1%，再加上RLC层的ARQ后性能<span style="color: black;">提高</span>到10^-5数量级。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">BLER在10%以内都算正常。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">5、<span style="color: black;">PCI/PCC/SCC</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">PCI:<span style="color: black;"><span style="color: black;">理学</span>小区标识，范围（</span><span style="color: black;">0-503</span><span style="color: black;">）共计</span><span style="color: black;">504</span><span style="color: black;">个，</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">能够</span>判断扇区<span style="color: black;">是不是</span>接反或鸳鸯线</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">判断扇区接反的<span style="color: black;">办法</span>：例如百子亭三个扇区</span>PCI<span style="color: black;">分别是</span><span style="color: black;">0/1/2 </span><span style="color: black;">，在</span><span style="color: black;">1</span><span style="color: black;">扇区主覆盖方向</span><span style="color: black;">UE</span><span style="color: black;">应该占用</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">0</span><span style="color: black;">，而<span style="color: black;">实质</span>测试占用是</span><span style="color: black;">1</span><span style="color: black;">，<span style="color: black;">而后</span>到</span><span style="color: black;">2</span><span style="color: black;">扇区主覆盖方向</span><span style="color: black;">UE</span><span style="color: black;">占用的</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">0</span><span style="color: black;">，<span style="color: black;">这般</span>就<span style="color: black;">能够</span>判定扇区接反。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">判断扇区鸳鸯线的<span style="color: black;">办法</span>：例如百子亭三个扇区</span>PCI<span style="color: black;">分别是</span><span style="color: black;">0/1/2</span><span style="color: black;">，在</span><span style="color: black;">1</span><span style="color: black;">扇区主覆盖方向</span><span style="color: black;">UE</span><span style="color: black;">应该占用</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">0</span><span style="color: black;">（或是</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">1</span><span style="color: black;">），看邻区表窗口，</span><span style="color: black;">PCI:0</span><span style="color: black;">和</span><span style="color: black;">1</span><span style="color: black;">，的</span><span style="color: black;">RSRP</span><span style="color: black;">值非常接近；<span style="color: black;">而后</span>到在</span><span style="color: black;">2</span><span style="color: black;">扇区主覆盖方向</span><span style="color: black;">UE</span><span style="color: black;">应该占用</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">0</span><span style="color: black;">（或是</span><span style="color: black;">PCI</span><span style="color: black;">是</span><span style="color: black;">1</span><span style="color: black;">），看邻区表窗口，</span><span style="color: black;">PCI:0</span><span style="color: black;">和</span><span style="color: black;">1</span><span style="color: black;">，的</span><span style="color: black;">RSRP</span><span style="color: black;">值<span style="color: black;">亦</span>非常接近；<span style="color: black;">这般</span><span style="color: black;">能够</span>判定是鸳鸯线了。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">PCC<span style="color: black;">：<span style="color: black;">暗示</span>主载波，</span><span style="color: black;">SCC</span><span style="color: black;">：<span style="color: black;">暗示</span>辅载波，<span style="color: black;">日前</span></span><span style="color: black;">LTE(R9</span><span style="color: black;">版本</span><span style="color: black;">)</span><span style="color: black;">都是采用单载波的，到</span><span style="color: black;">4G(R10</span><span style="color: black;">版本</span><span style="color: black;">)</span><span style="color: black;">有多载波联合技术，就有<span style="color: black;">暗示</span>辅载波。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">6、</strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">Rank/PDSCH RB number/Antenna</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTxZLfSiciaHibWoqfZQJtP9XLmKUglKVt9YsYcUiakILrHBEunA1z8ia3hNA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">Rank indicator：<span style="color: black;">暗示</span>层的意思，rank1<span style="color: black;">暗示</span>单层（单路），速率较低，rank2<span style="color: black;">暗示</span>2层（双路），速率高。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">PDSCH RB number：<span style="color: black;">暗示</span>用户<span style="color: black;">运用</span>的该用户<span style="color: black;">运用</span>的RB数。这个值看出，该扇区下大概有</span><span style="color: black;">几个用户。（20M带宽对应100个RB ,15M对应75个RB，10M对应50个RB，5M对应25个RB，3M对应15个RB，1.4M对应6个RB），多用户<span style="color: black;">能够</span><span style="color: black;">导致</span>速率低<span style="color: black;">原由</span>之一。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">TX antenna 2<span style="color: black;">暗示</span>基站有2个发射天线</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">RX antenna 2<span style="color: black;">暗示</span>UE有2个接收天线，<span style="color: black;">这般</span>就<span style="color: black;">能够</span>实现了MOMO技术，速率<span style="color: black;">提高</span>一倍；</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">倘若</span>看到antenna0和antenna1的RSRP值相差<span style="color: black;">很强</span>，则说明UE（终端）的性能有问题，不可用来做业务测试。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;"><strong style="color: blue;">7、</strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">Serving/Neighbouring</span></strong></span></span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTooujYIq0ic3FZ50fvEBbuyqkZe3qZg4sw3tu1Ta7AxicdDSR5PYfUpsg/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">Serving：主服务小区，当前占用的小区；</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">Neighbouring：相邻小区，主服务小区之外的其它相邻小区；</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">EARFCN:<span style="color: black;"><span style="color: black;">暗示</span>下行的中心频点；</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">服务小区与邻小区的</span>PIC<span style="color: black;"><span style="color: black;">不可</span></span><span style="color: black;">mod3、<span style="color: black;">mod6和</span>mod30</span><span style="color: black;">值相同，否则有很强的干扰；</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">日前</span>网络都是同频组网，存在导频污染，看服务小区与邻小区（多个邻小区）的</span>RSRP<span style="color: black;">相差</span><span style="color: black;">6dB</span><span style="color: black;"><span style="color: black;">上下</span>。</span></span><span style="color: black;">另<span style="color: black;">倘若</span><span style="color: black;">显现</span>服务小区比邻小区的</span><span style="color: black;">RSRP</span><span style="color: black;">弱</span><span style="color: black;">10dB</span><span style="color: black;">，则说明切换有问题（有可能漏配邻区或是</span><span style="color: black;">CIO</span><span style="color: black;">设置不<span style="color: black;">恰当</span>）。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">8、</strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">MIMO</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTMj9usqnrY0huHxTibsOILfgo5VvTia9vLmo9j9YATT0Bf6UbBs4H6ia5g/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2T2R SFBC<span style="color: black;"><span style="color: black;">暗示</span>传输分集，速率不高，</span></span><span style="color: black;">2T2R OLSM</span><span style="color: black;"><span style="color: black;">暗示</span>空间复用，速率很高。</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;">9、</strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">Throughput</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbThbdI2OlrVialt2LlquBASial654uvvLXNWGIz5CnhXOM4NwTl0DjSfsQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">Throughput（吞吐量）<span style="color: black;">表示</span></span>PHY<span style="color: black;">、</span><span style="color: black;">MAC</span><span style="color: black;">、</span><span style="color: black;">RLC</span><span style="color: black;">、</span><span style="color: black;">PDCP</span><span style="color: black;">个层的速率值。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">十、</span></strong></span><span style="color: black;"><strong style="color: blue;"><span style="color: black;">UE state</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTC0KyWvicTopBaeibhZiaDgVWjEc5Ew2Oc4w4L5flpRPeWb3jGhnInz6hA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">表示</span>终端信息（<span style="color: black;">包含</span>IMSI等）。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">11、TA</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTxC8bJj0fHLQC3VYM1U31KDdeuuXYuJ0ejYwwfDHPqjpJuVx1UXlrmA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">跟踪区（</span>Tracking Area<span style="color: black;">）是</span><span style="color: black;">LTE/SAE</span><span style="color: black;">系统为</span><span style="color: black;">UE</span><span style="color: black;">的位置管理新设立的概念。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">跟踪区设计<span style="color: black;">需求</span>：</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;"><span style="color: black;">针对</span></span>LTE<span style="color: black;">的接入网和核心网保持相同的位置区域的概念</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">当</span>UE<span style="color: black;"><span style="color: black;">处在</span>空闲状态时，核心网能够<span style="color: black;">晓得</span></span><span style="color: black;">UE</span><span style="color: black;">所在的跟踪区</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">当<span style="color: black;">处在</span>空闲状态的</span>UE<span style="color: black;">需要被寻呼时，必须在</span><span style="color: black;">UE</span><span style="color: black;">所注册的跟踪区的所有小区进行寻呼</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><span style="color: black;">在</span>LTE<span style="color: black;">系统中应<span style="color: black;">尽可能</span>减少因位置改变而<span style="color: black;">导致</span>的位置更新信令。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">T</span><span style="color: black;">AI<span style="color: black;">是LTE</span><span style="color: black;">的跟踪区标识（Tracking Area Identity</span><span style="color: black;">），<span style="color: black;">是由于</span>PLMN</span><span style="color: black;">和TAC</span><span style="color: black;"><span style="color: black;">构成</span>。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">TAI = PLMN + TAC<span style="color: black;">（Tracking Area Code</span><span style="color: black;">）。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">TAC (Tracking area code of cell served by neighbor Enb)</span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1. &nbsp;<span style="color: black;">参数中文名<span style="color: black;">叫作</span>:</span><span style="color: black;">跟踪区域码；</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2. &nbsp;<span style="color: black;">参数英文名<span style="color: black;">叫作</span>:Tracking area code of cell served by neighbor eNB。</span></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">12、Mode模式</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbT0Hk05mxTzdL905MZaia5tl2B8ficJ4ObzxzZiaM3TDibMWSutfmgDHkhAw/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">13、LTE网络特点</span></strong></span></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTyR5HnvLicacS7CX7yt4bjEWaQIkyw6ZpdvWanr02YHKEoMpGCZqomfA/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;">14、LTE关键技术</span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbT7H54cxiavcX89EANoEkW9MHoRkfxtx8gtEZaUVEnF2Wf9TIG0Jz8Q2Q/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbTiaQj7JyLClvmCqsr9r81l2hBia4a3pibxWKJHNhtxK688ykwNIaRoc9zQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://mmbiz.qpic.cn/mmbiz_png/L2S1ZCE4HicoDnbpibCv97nPQWLFFZHMbT0rXjF71YETb7TZszicFz3kSHKbLNQUZPwNDQSs2Y6rRj4zn43HrYMzQ/640?wx_fmt=png&amp;tp=webp&amp;wxfrom=5&amp;wx_lazy=1&amp;wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;"></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;"></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><span style="color: black;"><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;"></span></strong></p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">本文部分内容<span style="color: black;">源自</span>于网络文档，<span style="color: black;">倘若</span><span style="color: black;">触及</span>侵权等问题<span style="color: black;">能够</span>联系我（zhangqing822），谢谢关注。</p>
    <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="data:image/svg+xml,%3C%3Fxml version=1.0 encoding=UTF-8%3F%3E%3Csvg width=1px height=1px viewBox=0 0 1 1 version=1.1 xmlns=http://www.w3.org/2000/svg xmlns:xlink=http://www.w3.org/1999/xlink%3E%3Ctitle%3E%3C/title%3E%3Cg stroke=none stroke-width=1 fill=none fill-rule=evenodd fill-opacity=0%3E%3Cg transform=translate(-249.000000, -126.000000) fill=%23FFFFFF%3E%3Crect x=249 y=126 width=1 height=1%3E%3C/rect%3E%3C/g%3E%3C/g%3E%3C/svg%3E" style="width: 50%; margin-bottom: 20px;"></p>

wrjc1hod 发表于 2024-10-5 10:25:49

你的话语如春风拂面，让我感到无比温暖。

查看完整版本: LTE网络RF优化之前台测试基本知识