优咖对你说 | 高铁通信网基本优化篇
<span style="color: black;">“</span><p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">在“一带一路”国际合作高峰论坛即将来临前夕，<span style="color: black;">相关</span>“中国新四大发明”的<span style="color: black;">报告</span>在各大网站间疯传，在一份由外国人评选出的“中国新四大发明”中，有着“陆地飞行器”之<span style="color: black;">叫作</span>的高铁赫然在列，<span style="color: black;">诱发</span>了网友们的热烈关注。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">按说，世界<span style="color: black;">第1</span>条高铁是1964年正式运营的日本新干线，横跨英吉利海峡的著名的“欧洲之星”<span style="color: black;">亦</span>始发于1994年，而中国首条高铁京津城际高铁正式运营于2008年。仅从这一点来看，高铁<span style="color: black;">加入</span>“中国新四大发明”似乎站不住脚。然而，笔者认为，中国高铁近年来的<span style="color: black;">明显</span>表现，及其带来的广泛深远影响，令外国“铁粉”惊羡不已，<span style="color: black;">爱慕</span>之下将之选入极富感性色彩的“中国新四大发明”，<span style="color: black;">亦</span>在情理之中。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"> — — 黄河时评</span></p><span style="color: black;">”</span>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高铁<span style="color: black;">做为</span>一种<span style="color: black;">有效</span>经济的城际交通方式，<span style="color: black;">拥有</span>高速、<span style="color: black;">方便</span>、环保和安全的特点，日渐<span style="color: black;">作为</span>人们中长距离出行的首选。高铁通信网不仅为客户<span style="color: black;">供给</span><span style="color: black;">各样</span>网络信息化服务，还提信各类息发布、视频监控服务，<span style="color: black;">保证</span>行车安全，辅助高铁运营。高铁通信逐步<span style="color: black;">作为</span>各运营商品牌竞争，获取经济利润的新<span style="color: black;">行业</span>。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1.高铁场景特征介绍</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高铁的设计时速为350 km/h，正常运营速度在300 km/h<span style="color: black;">上下</span>。高铁场景<span style="color: black;">通常</span>采用专网组网，存在信道<span style="color: black;">要求</span>变化剧烈，受多普勒频移影响，列车高速运动会<span style="color: black;">引起</span>接收端接收信号频率<span style="color: black;">出现</span>变化。<span style="color: black;">同期</span>车型不<span style="color: black;">同样</span>，车厢穿透损耗稍有差别，D频段损耗为26dB,F频段损耗为22 dB。高铁环境<span style="color: black;">重点</span><span style="color: black;">拥有</span>如下特点，<span style="color: black;">亦</span>是其面临需要克服的<span style="color: black;">有些</span><span style="color: black;">困难</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;"> 车体损耗 </span></strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">因为</span>铁路线<span style="color: black;">一般</span>呈狭长分布，天线<span style="color: black;">通常</span>与铁路夹角较小，<span style="color: black;">同期</span>高速列车屏蔽效果比较好，信号穿透损耗<span style="color: black;">很强</span>。</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_jpg/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHSAjVFMWPa6NL2m0x5K9PLYJjbDFKGOVxnU6mbJNh67wZapfh4V2S8g/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1&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;">信号入射角与穿透损耗关系实测结果如下图：</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHLDCDNGMrQibWyYEIrQR3z6Bk5iaVgpnHIFz4p6OVFZy346hpwTZFeDFg/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;"><span style="color: black;">区别</span>车型损耗如下图：</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;"> 车型</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;">普通车型损耗(dB)</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;">运行速度（km/h)</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"> CRH1</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">28</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">250</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CRH2</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">24</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">200-350</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CRH3</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">28</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">350</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CRH5</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">28</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">250</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">CRH380</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">26</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">300-400</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;">高铁列车上<span style="color: black;">区别</span>的位置穿损<span style="color: black;">区别</span>，乘客位置示意图如下：</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHnZJLyP99trdkHWvSJwQC03xYoeibSDFib0Ah4LVHod0RZjkclXacKIlA/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;"><span style="color: black;">同期</span><span style="color: black;">按照</span>实测，车门、车窗以及过道的座位平均RSRP值差异<span style="color: black;">很强</span>，车窗和过道位置差6dB<span style="color: black;">上下</span>，以靠车门RSRP为-86dbm的相同车次测试结果统计如下：</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;">测试UE位置</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;">RSRP均值（dBm）</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;">差异（dB）</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">车门</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">-86</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">0</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">窗口的座位</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">-90</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">4</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">过道的座位</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">-96</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">10</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;">终端移动速度快、多普勒频偏</span></strong><strong style="color: blue;"><span style="color: black;"><strong style="color: blue;"><span style="color: black;">大</span></strong> </span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">终端移动速度超过200km/h，<span style="color: black;">都数</span>区域达到300km/h以上。当终端移动速度超过200km/h，多普勒频移超过400Hz，当移动速度超过250km/h ，频偏超过500Hz。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHiaM4fRhDHMDibcKIGFKRfDibfeehumHz6ys6jAkgj8SUicajXPDvGfUCZw/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;"> 用户分布 </span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">与高速公路<span style="color: black;">区别</span>，高速铁路用户集中分布在列车车厢内，用户的切换、小区重选等<span style="color: black;">行径</span>都非常集中，所以基站资源的<span style="color: black;">运用</span>呈突发性。高铁场景下为为<span style="color: black;">处理</span>小区间频繁的切换影响用户感知，<span style="color: black;">经过</span>超级小区组网即多小区合并方式，减少因切换带来用户感知下降。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">频繁切换和速率关系比较图如下：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHTLic1ibt8dbokjHffUsibLgexIWtPyFYH0I19xVMS9nDAoSGMiaY3dIFibw/640?wx_fmt=gif&tp=webp&wxfrom=5&wx_lazy=1&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;">2.高铁优化<span style="color: black;">办法</span></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">覆盖为网络的<span style="color: black;">基本</span>，一个良好的覆盖是网络性能的基本<span style="color: black;">保证</span>，<span style="color: black;">思虑</span>到高铁列车的穿损，<span style="color: black;">需求</span><span style="color: black;">平常</span>优化中需要做到精细化的站点规划和RF优化<span style="color: black;">调节</span>，<span style="color: black;">同期</span><span style="color: black;">思虑</span>到高铁用户集中，为避免<span style="color: black;">太多</span>的切换<span style="color: black;">导致</span>信令风暴和<span style="color: black;">反常</span>事件，<span style="color: black;">经过</span>小区合并方式，减少切换带来的信令风暴<span style="color: black;">导致</span>用户感知差。</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;"> 站点规划</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">良好的站点规划为后续网络覆盖优化的<span style="color: black;">基本</span>。以VoLTE业务MOS大于3对无线环境的<span style="color: black;">需要</span><span style="color: black;">做为</span><span style="color: black;">关联</span>站点规划的基准，基于<span style="color: black;">平常</span>测试数据分析与MOS大于3对无线环境<span style="color: black;">需要</span>的仿真<span style="color: black;">评定</span>，<span style="color: black;">区别</span>频段下站间距<span style="color: black;">需求</span>如下：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYH3cgmXcysxH4vF5p8DmeNf7JdyLWQlJ5AL0AN5VW1icQNvrZiaSHVicvWg/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;">F频段承载23.85K高清语音，D频段承载PS业务，郊区高铁站间距<span style="color: black;">意见</span>600m，城区<span style="color: black;">意见</span>400m。</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;"> 容量规划</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">为避免高铁网络与周边非高铁公网之间频段的干扰，高铁场景<span style="color: black;">通常</span>采用专用频段。随着4G<span style="color: black;">持续</span>发展，2016年底4G用户渗透率达到56%，2017年底达到72%，<span style="color: black;">区别</span>时期应<span style="color: black;">按照</span>网络的<span style="color: black;">关联</span>容量进行相应的载波扩容规划。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHnMrYLruKl8NYlQ6RRviaYqfmBdV7usjnatzpplStIXV5GqrEUV2vlvg/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;"> 小区合并</span></strong></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;">思虑</span>到高铁场景用户集中、车速快等特点，为减少切换带来的信令风暴，采用超级小区Supercell来进行组网，缓解小区间干扰，Supercell组网相比较于小区合并前会带来容量的降低。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHqHnIGtQCDbAvLyZqfkPpBUw8MMESzHts542SicaGGemGytuQnQiae5mA/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;">以60km长、时速300km、平均杆间距1km的高铁路段为例，<span style="color: black;">区别</span>的小区合并能力对<span style="color: black;">例如</span>下表：</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;">小区合并能力配置</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;"><span style="color: black;">规律</span>小区覆盖范围</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;">切换周期（时速300km/h）</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;">60km路段所需切换次数</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2CP</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1km</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">12s</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">59</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">4CP</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2km</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">24s</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">29</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">6CP</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">3km</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">36s</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">19</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">12CP</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">6km</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">72s</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">9</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;"> 邻区规划</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;">单载波组网邻区规划</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高铁初期组网建设时<span style="color: black;">通常</span>采用单载波组网方式。其中BPL1基带板支持6CP，BPN2基带板支持12CP，<span style="color: black;">关联</span>邻区配置整体原则为：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHG5NurF7n7SOowgWQ6dibnEic7SxWbXarkrS9DsUTwNnvHqcn3p32Z5LA/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;">多载波组网邻区规划</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">随着TDD用户数的<span style="color: black;">持续</span>发展，单载波组网下容量<span style="color: black;">显现</span>受限，为<span style="color: black;">处理</span>容量受限<span style="color: black;">引起</span>的用户感知下降，采用新增频段即采用多载波的组网方式，<span style="color: black;">提高</span>系统容量，<span style="color: black;">从而</span><span style="color: black;">提高</span>用户感知，邻区规划整体原则如下（以F+D1+D2为例，双载波配置原则相同）：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_png/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYHL6eJnickR7pNic0k65Ykdo8Yyz2LJfGOLwbRrUYEtyZVhib1vOtaoTLVw/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&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;">公专网干扰协同优化</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高铁场景<span style="color: black;">通常</span>采用与公网异频的专用频段组网，为避免公专网之间干扰影响高铁用户感知，<span style="color: black;">平常</span>优化中<span style="color: black;">经过</span>公专网之间的频段优化即避免公专网之间存在重叠带宽组网，<span style="color: black;">从而</span><span style="color: black;">提高</span>高铁用户的感知度。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">公专频点优化<span style="color: black;">方法</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">公专频点协同优化，应<span style="color: black;">尽可能</span>使公专网采用异频方式组网，部分确实<span style="color: black;">没法</span>完全异频场景，可<span style="color: black;">思虑</span>采用错频组网<span style="color: black;">方法</span>。以F频段为例，<span style="color: black;">意见</span><span style="color: black;">守护</span>带公专网频段可进行如下规划：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">专网F频段15M带宽组网</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- 高铁专网 F2（高端15MHz）+D3+(D2)；</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- 隔离带内的公网F1+D1+D2</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- 隔离带外的公网F1+F2+D1+D2+D3</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">专网F频段20M带宽组网</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- </span><span style="color: black;">高铁专网 F2（高端20MHz）+D3+(D2)；</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- 隔离带内的公网F1(低段15M)+D1+D2</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">- 隔离带外的公网F1+F2+D1+D2+D3 </span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高铁场景<span style="color: black;">拥有</span>车速快、穿损大、用户集中等特点，<span style="color: black;">平常</span>优化中，以覆盖为<span style="color: black;">基本</span>，<span style="color: black;">经过</span><span style="color: black;">恰当</span>的站点和容量规划、覆盖优化<span style="color: black;">调节</span>、公专网协同优化以及<span style="color: black;">恰当</span>的小区合并<span style="color: black;">保准</span>网络的基本覆盖和容量<span style="color: black;">需要</span>，<span style="color: black;">从而</span><span style="color: black;">保准</span>高铁用户的最佳感知度。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_jpg/XyibNCNBXibRp8hMVGUNFmYXxHwDRYsKYH8zLOGEWZMwfSOjgsgnN9AMsEYXSargN59T5yFDOKvEkLia8X2bmLOxg/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></p>
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<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">作 者：网优大兵</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">图文编辑：赵小二</span></p>
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