LTE 全网参数优化策略
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="http://mmbiz.qpic.cn/mmbiz_jpg/AIdaItyvn1G0NXytd3Q07YFsJEE4chL2tl4QicTriaib5bY3Vlh8hCIEdPqYk8NZT5Uy2Jq4pXIKZjHibmg4AaTQtA/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;"><span style="color: black;"><strong style="color: blue;"><strong style="color: blue;">网络安全无小事！</strong></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;">参数<span style="color: black;">调节</span>需<span style="color: black;">谨慎</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;">修改之前要确认、确认、再确认！</strong></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2016</span><span style="color: black;">第01期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">网优秦文丽、刘桓、杨晓青供稿 </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;">导读</span></strong><span style="color: black;">：围绕用户感知<span style="color: black;">提高</span>和网络考核指标，</span>2016<span style="color: black;">年</span>LTE<span style="color: black;">参数策略兼顾</span>Volte<span style="color: black;">和数据业务，基于<span style="color: black;">区别</span>场景开展精细化优化，分为</span>8<span style="color: black;">大类</span>107<span style="color: black;">个参数，<span style="color: black;">日前</span>联合各分<span style="color: black;">机构</span>完成</span>35<span style="color: black;">个参数优化推广。</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;">本期案例共享：</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1<span style="color: black;">、乒乓切换优化改善</span>RRC<span style="color: black;">重建、</span>VOLTE<span style="color: black;">吞字、速率掉零问题。（<span style="color: black;">实验</span>区域：<strong style="color: blue;"><span style="color: black;">城<span style="color: black;">1、</span>城<span style="color: black;">2、</span>顺义、通州</span></strong>分<span style="color: black;">机构</span>）</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2<span style="color: black;">、微蜂窝</span>2:2<span style="color: black;">配比修改。（<span style="color: black;">实验</span>区域：<span style="color: black;"><strong style="color: blue;">城<span style="color: black;">1、</span>城三</strong></span>分<span style="color: black;">机构</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;">案例分享一：乒乓切换优化，改善</span></strong><strong style="color: blue;">RRC</strong><strong style="color: blue;"><span style="color: black;">重建对</span></strong><strong style="color: blue;">VOLTE</strong><strong style="color: blue;"><span style="color: black;">语音质量的影响</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优化联系人——网优中心：秦文丽、刘桓</span> </p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">乒乓切换既影响</span>volte<span style="color: black;">话音质量，又影响用户的速率感知，<span style="color: black;">因此呢</span>乒乓切换<span style="color: black;">始终</span>是网络优化工作的重点内容。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">1</strong><strong style="color: blue;"><span style="color: black;">、优化策略：</span></strong><span style="color: black;">针对乒乓切换进行了专项攻关，华为基站<span style="color: black;">运用</span></span>SON<span style="color: black;">中的</span>MRO<span style="color: black;">（移动鲁棒性优化）技术，实现了自动针对乒乓切换<span style="color: black;">调节</span>小区</span>CIO<span style="color: black;">，<span style="color: black;">控制</span>乒乓切换的功能；中兴基站开启乒乓切换<span style="color: black;">控制</span>功能开关，并将<span style="color: black;">控制</span>乒乓切换<span style="color: black;">按时</span>器设置为</span>2<span style="color: black;">秒，实现<span style="color: black;">控制</span>乒乓切换功能。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">网优中心联合<span style="color: black;">城<span style="color: black;">1、</span>城<span style="color: black;">2、</span>顺义、通州</span>分<span style="color: black;">机构</span><span style="color: black;">经过</span></span>TOP<span style="color: black;">站点及网格<span style="color: black;">实验</span>，验证了功能对网络性能的影响，并于</span>1<span style="color: black;">月</span>12<span style="color: black;">日和</span>1<span style="color: black;">月</span>20<span style="color: black;">日分别将华为和中兴该项功能全网推广。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">2</strong><strong style="color: blue;"><span style="color: black;">、推广效果:全网乒乓切换比例下降</span>6.18%</strong><strong style="color: blue;"><span style="color: black;">，</span>RRC</strong><strong style="color: blue;"><span style="color: black;">重建次数下降</span>2.71%</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/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQkUSblJrE9qWoVDeiaySE1JozThURiaJzibkibk9jVyqzITx3bfibic1ZY64g/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;"><span style="color: black;">华为设备区域全网乒乓切换比例下降了</span>6.23%<span style="color: black;">，</span>RRC<span style="color: black;">重建次数下降</span>2.38%。<span style="color: black;">中兴设备区域乒乓切换比例下降了</span><span style="color: black;">6.09%</span><span style="color: black;">，</span><span style="color: black;">RRC</span><span style="color: black;">重建次数降低</span><span style="color: black;">3.10%。</span><span style="color: black;">可<span style="color: black;">必定</span>程度降低对</span><span style="color: black;">Volte</span><span style="color: black;">话音质量的影响。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">3</strong><strong style="color: blue;"><span style="color: black;">、需分<span style="color: black;">机构</span><span style="color: black;">平常</span>优化关注：</span></strong><span style="color: black;">乒乓切换还与个别小区</span>CIO<span style="color: black;">参数设置<span style="color: black;">相关</span>，</span>1<span style="color: black;">月初<span style="color: black;">起始</span>网优中心每周对全网小区个体偏移<span style="color: black;">状况</span>进行核查，截止<span style="color: black;">日前</span>现网中有</span>1186<span style="color: black;">个正反向邻区对</span>CIO<span style="color: black;">配置均大于</span>0<span style="color: black;">。请分<span style="color: black;">机构</span>针对违规小区进行邻区</span>CIO<span style="color: black;">参数的优化<span style="color: black;">调节</span>，避免<span style="color: black;">显现</span>双向邻区对</span>CIO<span style="color: black;">均大于</span>0<span style="color: black;">的<span style="color: black;">状况</span>。</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/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQumXRrAeBwuU9BThLG7NZX05iccf5wCAic1qorU9ib7r1mxSfbbQuDWib3g/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;">案例分享二：微蜂窝上下行时隙配比</span></strong><strong style="color: blue;">2:2</strong><strong style="color: blue;"><span style="color: black;"><span style="color: black;">实验</span>及推广<span style="color: black;">意见</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">优化联系人——网优中心：秦文丽、杨晓青</span> </p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">为<span style="color: black;">处理</span>高话务室分站点上行受限问题，并兼顾</span>Volte<span style="color: black;">业务<span style="color: black;">需要</span>，网优中心联合城一和城三分<span style="color: black;">机构</span>，开展上行高话务室内站点上下行时隙配比由</span>1:3<span style="color: black;">修改为</span>2:2<span style="color: black;">的<span style="color: black;">实验</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;"><span style="color: black;">实验</span>结果</span></strong><span style="color: black;">：修改后测试上传速率翻倍，下载速率下降约</span>30%<span style="color: black;">，<span style="color: black;">城三</span>小区上行</span>PRB<span style="color: black;">大于</span>50%<span style="color: black;">的<span style="color: black;">显现</span>次数由</span>109<span style="color: black;">次下降到</span>25<span style="color: black;">次，<span style="color: black;">城一</span>小区平均</span>PRB<span style="color: black;">利用率日均由</span>40%<span style="color: black;">下降到</span>30%<span style="color: black;">，达到<span style="color: black;">平衡</span>上下行</span>PRB<span style="color: black;">平均利用率的目的。但<span style="color: black;">因为</span>城一站点<span style="color: black;">位置于</span>密集城区，受到周边微蜂窝的影响，上行干扰<span style="color: black;">提高</span>了</span>4~5dB<span style="color: black;">，<span style="color: black;">导致</span>接通率和掉线率小幅波动。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQpgbp1VNkMF4sf36aBK5k7D580Bk5UNBsZKAibwLpYsgA4l08mFPoy4Q/640?tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></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;">推广<span style="color: black;">意见</span></span></strong><span style="color: black;">：统计全网</span>E<span style="color: black;">频段室内小区，<span style="color: black;">根据</span><span style="color: black;">1星期</span></span>15<span style="color: black;">分钟粒度上行</span>PRB<span style="color: black;">利用率大于</span>50%<span style="color: black;"><span style="color: black;">显现</span>次数大于</span>100(<span style="color: black;"><span style="color: black;">显现</span>概率大于</span>15%)<span style="color: black;">，且下行</span>PRB<span style="color: black;">利用率大于</span>30%<span style="color: black;"><span style="color: black;">显现</span>次数<span style="color: black;">少于</span>等于</span>20(<span style="color: black;"><span style="color: black;">显现</span>概率<span style="color: black;">少于</span></span>3%)<span style="color: black;">，除去<span style="color: black;">轻轨</span>小区，共有</span>110<span style="color: black;">个。（<span style="color: black;">名单</span>见公文：网络优化中心</span>2016<span style="color: black;">年第</span>1<span style="color: black;">周工作通报）</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/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQc6MHU4xl2m277JkvOHdpDcH1yfV4HINheHMmKwTHe5FjZRgXCjYVjw/640?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;"><span style="color: black;">意见</span>分<span style="color: black;">机构</span>现场测试，<span style="color: black;">针对</span><span style="color: black;">不可</span><span style="color: black;">即时</span>进行扩容的场景，需<span style="color: black;">评定</span>周边</span>E<span style="color: black;">频段小区的互相干扰问题。<span style="color: black;">倘若</span></span>2:2<span style="color: black;">修改带来干扰严重<span style="color: black;">提升</span>，则应<span style="color: black;">经过</span>扩容<span style="color: black;">处理</span>上行容量问题。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">LTE</strong><strong style="color: blue;"><span style="color: black;">参数优化思路及<span style="color: black;">发展</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2016<span style="color: black;">年参数工作聚焦数据业务和</span>Volte<span style="color: black;">融合发展，分三大类开展优化，<span style="color: black;">同期</span><span style="color: black;">研发</span>工具平台支撑参数分级管控需要。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQqAyuuna72tUSCibRU24d7ye5KEgWKL1QsVc8RJLN5qWkJORDK9n2mrA/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></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;">整体参数优化策略<span style="color: black;">实验</span>和推广<span style="color: black;">发展</span></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/714NVGEzAN43bxjg6ZFby4H6aicBXyuCQJqh9eTI7qBoYqfH8NpILNM9T20AQU0SKiajYEDX0eWBsElkUjjttaJQ/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;"><span style="color: black;">网优中心将联合各分<span style="color: black;">机构</span>，<span style="color: black;">连续</span>推进整体参数优化策略<span style="color: black;">实验</span>和现网推广，<span style="color: black;">实验</span><span style="color: black;">状况</span>将<span style="color: black;">经过</span>公众号<span style="color: black;">持续</span>发布。</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_gif/AIdaItyvn1EkzVLZJ7x3ZM6OV9KLz8oKbLPtic4sqBXWcahbvzkibxBP1aavfuOfhw1taLkuv1ichjn6tibBklZo4w/0?wx_fmt=gif&tp=webp&wxfrom=5&wx_lazy=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;">LTE 参数优化案例--第02期</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2016-04-13</span> <span style="color: black;">刘桓秦文丽杨晓青</span> 网络优化中心</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;">导读</span></strong><span style="color: black;">：围绕用户感知<span style="color: black;">提高</span>和网络考核指标，</span>2016<span style="color: black;">年</span>LTE<span style="color: black;">参数策略兼顾</span>Volte<span style="color: black;">和数据业务，基于<span style="color: black;">区别</span>场景开展精细化优化，分为</span>8<span style="color: black;">大类</span>107<span style="color: black;">个参数，<span style="color: black;">日前</span>联合各分<span style="color: black;">机构</span>完成</span>70<span style="color: black;">个参数优化推广。</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;">本期案例：</span></strong><span style="color: black;"><strong style="color: blue;"><span style="color: black;">华为、诺基亚上行预调度功能优化</span></strong></span><span style="color: black;">，有效降低上行</span><span style="color: black;">PRB</span><span style="color: black;">利用率及上行干扰，<span style="color: black;">同期</span>改善</span><span style="color: black;">Volte</span><span style="color: black;">时延。（<span style="color: black;">实验</span>区域：<strong style="color: blue;">城<span style="color: black;">1、</span>城<span style="color: black;">2、</span>大兴</strong>分<span style="color: black;">机构</span>）</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">一</strong><strong style="color: blue;"><span style="color: black;">、预调度原理</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">传统的上行调度是终端有上行数据传输，<span style="color: black;">首要</span>要在</span>PUCCH<span style="color: black;">信道上发送</span>SR<span style="color: black;">（调度请求），待基站给终端上行授权后，终端<span style="color: black;">按照</span>基站上行授权指示的位置发送上行数据。上行预调度功能会在用户停止传输上行数据后在一<span style="color: black;">按时</span>间内<span style="color: black;">保存</span><span style="color: black;">必定</span>上行资源，从而当终端在有频繁小包传送<span style="color: black;">需要</span>时省去重新申请资源的时延，<span style="color: black;">加强</span>频繁小包传送效率。但为用户<span style="color: black;">保存</span><span style="color: black;">必定</span>上行资源会占用部分</span>RB<span style="color: black;">资源，<span style="color: black;">提高</span>上行干扰。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7iaAH1JQ1LeYHDFp6aicILSlVtPCGIIibErOaicy6kNQpz6GUQFUUhzl3jbjjWMfyQTT6S2XYV0CicLyg/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">二</strong><strong style="color: blue;"><span style="color: black;">、全网超忙小区分析</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">提取现网<span style="color: black;">1星期</span>的超忙小区分析，<span style="color: black;">发掘</span>如下规律：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">华为、诺西的上行利用率较高，中兴下行利用率较高。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">华为和诺西上行超忙小区比例远高于中兴</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7iaAH1JQ1LeYHDFp6aicILSl5dRwPLztukh7JRTGI9Uq0oRz5ZIvmzZnn5owEL8wQkqTTRYT7vhjYA/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">三<span style="color: black;">、实验<span style="color: black;">方法</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">分析各厂家</span><span style="color: black;">PRB</span><span style="color: black;">利用率差异与各自上行预调度功能支持<span style="color: black;">状况</span>和实现方式<span style="color: black;">相关</span>，网优中心牵头组织各厂家分<span style="color: black;">过程</span>进行了预调度功能及<span style="color: black;">触及</span>参数的多项<span style="color: black;">实验</span>和测试对比，以确认<span style="color: black;">最后</span>的参数实施<span style="color: black;">方法</span>。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">1)在<span style="color: black;">轻轨</span>、普通大业务、网格中挑选上下行忙和上忙下闲的场景进行预调度功能开关<span style="color: black;">实验</span>。</span><strong style="color: blue;">—</strong><strong style="color: blue;"><span style="color: black;">关闭功能上行</span></strong><strong style="color: blue;">PRB</strong><strong style="color: blue;"><span style="color: black;">下降，但时延<span style="color: black;">增多</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2)在上行利用率高的小区进行</span><span style="color: black;">10</span><span style="color: black;">组预调度参数组<span style="color: black;">实验</span>，测试每组参数对</span><span style="color: black;">VoLTE</span><span style="color: black;">接通时延及后台指标的影响。</span><strong style="color: blue;">—</strong><strong style="color: blue;"><span style="color: black;">确认<span style="color: black;">最后</span>参数<span style="color: black;">方法</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7iaAH1JQ1LeYHDFp6aicILSlztJI2icACoDCWYJGsfoD6pcibz1nibWwnmoibCosnF8wXaIfGWOuKKblag/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">3)华为<span style="color: black;">实验</span>区分</span><span style="color: black;">QCI</span><span style="color: black;">设置预调度参数，开启</span><span style="color: black;">VoLTE</span><span style="color: black;">预调度且关闭数据业务预调度功能。</span><strong style="color: blue;">—</strong><strong style="color: blue;"><span style="color: black;"><span style="color: black;">能够</span>降低上行</span></strong><strong style="color: blue;">PRB</strong><strong style="color: blue;"><span style="color: black;">利用率，且不影响</span></strong><strong style="color: blue;">VoLTE</strong><strong style="color: blue;"><span style="color: black;">时延</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">4)在华为干扰<span style="color: black;">很强</span>的两片区域进行预调度参数推广。<strong style="color: blue;">—降低干扰效果<span style="color: black;">显著</span></strong></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;"><span style="color: black;">4、</span>推广效果</span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">基于实验结果对华为和诺基亚的预调度功能进行了全网优化。</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;">1)华为</span></strong><span style="color: black;">：<span style="color: black;">选择</span>上行</span><span style="color: black;">PRB</span><span style="color: black;">利用率大于</span><span style="color: black;">50%</span><span style="color: black;">且<span style="color: black;">1星期</span><span style="color: black;">显现</span>超过</span><span style="color: black;">10</span><span style="color: black;">次的</span><span style="color: black;">568</span><span style="color: black;">个小区（城一、城<span style="color: black;">2、</span>大兴），开启</span><span style="color: black;">VoLTE</span><span style="color: black;">预调度且关闭数据业务预调度功能，参数<span style="color: black;">根据</span>以上实验结果设置，优化后常规</span><span style="color: black;">KPI</span><span style="color: black;">指标正常波动，<strong style="color: blue;">上行</strong></span><strong style="color: blue;">PRB</strong><strong style="color: blue;"><span style="color: black;">利用率下降了</span></strong><strong style="color: blue;">13.19</strong><strong style="color: blue;"><span style="color: black;">，</span></strong><strong style="color: blue;">QCI1</strong><strong style="color: blue;"><span style="color: black;">的</span></strong><strong style="color: blue;">PDCP</strong><strong style="color: blue;"><span style="color: black;">下行时延下降了</span></strong><strong style="color: blue;">1.61ms(24%)</strong><strong style="color: blue;"><span style="color: black;">，上行干扰值下降了</span></strong><strong style="color: blue;">0.29dB</strong><strong style="color: blue;"><span style="color: black;">，小时级干扰小区数由</span></strong><strong style="color: blue;">274</strong><strong style="color: blue;"><span style="color: black;">个下降为</span></strong><strong style="color: blue;">257</strong><strong style="color: blue;"><span style="color: black;">个</span></strong><strong style="color: blue;">(6.2%)</strong><span style="color: black;">。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7iaAH1JQ1LeYHDFp6aicILSlibrcs55qrOlgtSNZxaicwckVYvc55VZyTYnAlfAQCRRRWGy8SAlJ4qaw/640?tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></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;">同期</span>为观察上行预调度对干扰的影响，<span style="color: black;">选择</span>城<span style="color: black;">1、</span>城二干扰比较集中的两片区域</span><span style="color: black;">1363</span><span style="color: black;">个小区推广该<span style="color: black;">方法</span>。<strong style="color: blue;">推广后平均干扰由</strong></span><strong style="color: blue;">-110.99dBm</strong><strong style="color: blue;"><span style="color: black;">降为</span></strong><strong style="color: blue;">-114.24dBm</strong><strong style="color: blue;"><span style="color: black;">（下降</span></strong><strong style="color: blue;">3.25dB</strong><strong style="color: blue;"><span style="color: black;">），小时级干扰小区数由</span></strong><strong style="color: blue;">417</strong><strong style="color: blue;"><span style="color: black;">个下降为</span></strong><strong style="color: blue;">48</strong><strong style="color: blue;"><span style="color: black;">个，下降比例</span></strong><strong style="color: blue;">88.49%</strong><span style="color: black;">。</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;">2)诺基亚：</span></strong><span style="color: black;">其预调度参数<span style="color: black;">日前</span><span style="color: black;">仅有</span></span><span style="color: black;">ilReacTimerUl</span><span style="color: black;">可调，此参数<span style="color: black;">表率</span>当上行传输的数据块传完之后，在上行给</span><span style="color: black;">UE</span><span style="color: black;"><span style="color: black;">保存</span>资源上的时长。且</span><span style="color: black;">ilReacTimerUL Mod 100=5</span><span style="color: black;">时，</span><span style="color: black;">SRB</span><span style="color: black;"><span style="color: black;">能够</span>进行预调度。<span style="color: black;">因此呢</span>将诺基亚全网的预调度参数</span><span style="color: black;">ilReacTimerUl</span><span style="color: black;">由</span><span style="color: black;">200ms~1500ms</span><span style="color: black;">统一修改为</span><span style="color: black;">105ms</span><span style="color: black;">。</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">高负荷小区由</span><span style="color: black;">1500ms</span><span style="color: black;">修改至</span><span style="color: black;">105ms</span><span style="color: black;">，上行</span><span style="color: black;">PRB</span><span style="color: black;">利用率下降近</span><span style="color: black;">50%</span><span style="color: black;">。全网推广后常规</span><span style="color: black;">KPI</span><span style="color: black;">指标正常波动，<strong style="color: blue;">上行</strong></span><strong style="color: blue;">PRB</strong><strong style="color: blue;"><span style="color: black;">利用率下降了</span></strong><strong style="color: blue;">1.56%</strong><strong style="color: blue;"><span style="color: black;">，用户面下行时延下降了</span></strong><strong style="color: blue;">0.47ms</strong><strong style="color: blue;"><span style="color: black;">。</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/714NVGEzAN7iaAH1JQ1LeYHDFp6aicILSlbkGuVoR4eBOUg8QuaQhKOvhnmu139KQJFtRiaa1TIpLr0gicNtDGV19Q/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;">五</span><span style="color: black;">、总结</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;">上行预调度功能开启，为用户<span style="color: black;">保存</span><span style="color: black;">必定</span>上行资源，<span style="color: black;">当终端有频繁小包传送<span style="color: black;">需要</span>时节省重新申请资源的时延，<span style="color: black;">加强</span>频繁小包传送效率</span></span></strong><strong style="color: blue;"><span style="color: black;">。但打开预调度开关会<span style="color: black;">导致</span>额外的</span></strong><strong style="color: blue;">RB</strong><strong style="color: blue;"><span style="color: black;">资源消耗和上行干扰。综合<span style="color: black;">思虑</span>全网业务特点，上行预调度功能<span style="color: black;">意见</span>推广<span style="color: black;">方法</span>：</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;">1)华为：</span></strong><span style="color: black;">开启功能后<span style="color: black;">引起</span>上行</span><span style="color: black;">PRB</span><span style="color: black;">利用率虚高，上行干扰整体抬升。<strong style="color: blue;">推广<span style="color: black;">方法</span></strong>：关闭华为全网的数据业务预调度功能，<span style="color: black;">保存</span></span><span style="color: black;">VoLTE</span><span style="color: black;">业务的预调度，可在降低</span><span style="color: black;">PRB</span><span style="color: black;">利用率降低干扰的<span style="color: black;">状况</span>下不影响</span><span style="color: black;">VoLTE</span><span style="color: black;">用户的感知时延。<strong style="color: blue;">网优中心将在</strong></span><strong style="color: blue;">4</strong><strong style="color: blue;"><span style="color: black;">月底前完成全网推广</span></strong><span style="color: black;">。</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;">2)诺基亚：</strong>预调度功能<span style="color: black;">没法</span>区分</span><span style="color: black;">QCI</span><span style="color: black;">设置，<span style="color: black;">日前</span><span style="color: black;">已然</span>全网优化<span style="color: black;">调节</span>至较小值，对资源占用较小。<strong style="color: blue;"><span style="color: black;">意见</span>保持现网当前设置，在大业务<span style="color: black;">保证</span>时期可关闭此功能</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;">3)中兴：</strong>设备现有版本无数据业务预调度功能，后续版本实现后，网优中心将组织整体验证推广。</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_gif/AIdaItyvn1EkzVLZJ7x3ZM6OV9KLz8oKbLPtic4sqBXWcahbvzkibxBP1aavfuOfhw1taLkuv1ichjn6tibBklZo4w/0?wx_fmt=gif&tp=webp&wxfrom=5&wx_lazy=1" style="width: 50%; margin-bottom: 20px;"></p>
<h2 style="color: black; text-align: left; margin-bottom: 10px;">LTE参数优化案例--第03期</h2>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">2016-05-03</span> <span style="color: black;">秦文丽杨晓青刘桓</span> 网络优化中心</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;">本期案例：</span></strong><span style="color: black;"><strong style="color: blue;"><span style="color: black;">2G/3G/4G</span></strong><strong style="color: blue;"><span style="color: black;">互操作简化</span></strong></span><span style="color: black;"><span style="color: black;">，</span></span><span style="color: black;"><span style="color: black;">提高</span></span><span style="color: black;">4G</span><span style="color: black;">驻留比，降低网络参数配置<span style="color: black;">繁杂</span>度和终端异系统<span style="color: black;">测绘</span>时延，<span style="color: black;">加强</span></span><span style="color: black;">eSRVCC</span><span style="color: black;"><span style="color: black;">测绘</span>准确性，有效<span style="color: black;">提高</span></span><span style="color: black;">eSRVCC</span><span style="color: black;">成功率。（已完成</span><span style="color: black;">6</span><span style="color: black;">个分<span style="color: black;">机构</span>推广：<span style="color: black;">平谷、延庆</span>、密云、大兴、城<span style="color: black;">3、</span>城二，<span style="color: black;">计划分</span><span style="color: black;">3</span><span style="color: black;">批五月底前</span><span style="color: black;">完成全网推广工作</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;"><span style="color: black;">1、</span><strong style="color: blue;"><span style="color: black;">互操作简化</span></strong>优化效果</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;">前期</span></span><span style="color: black;">分别在延庆、平谷试点了中兴和华为的互操作简化<span style="color: black;">方法</span>，对比修改前后<span style="color: black;">1星期</span>平均数据：</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;">平谷分<span style="color: black;">机构</span></span></strong><span style="color: black;">：</span><strong style="color: blue;"><span style="color: black;"><span style="color: black;">4G</span></span></strong><strong style="color: blue;"><span style="color: black;">流量占比<span style="color: black;">提高</span></span></strong><strong style="color: blue;"><span style="color: black;"><span style="color: black;">0.3%</span></span></strong><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">用户数增幅</span><span style="color: black;"><span style="color: black;">12%</span></span><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">基于<span style="color: black;">测绘</span>的重定向次数由日均</span><span style="color: black;"><span style="color: black;">7326</span></span><span style="color: black;">次</span><span style="color: black;">减少到</span><span style="color: black;"><span style="color: black;">0</span></span><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">2G</span></span><span style="color: black;">盲重定向次数由日均</span><span style="color: black;"><span style="color: black;">422128</span></span><span style="color: black;">次<span style="color: black;">增多</span>到</span><span style="color: black;"><span style="color: black;">596317</span></span><span style="color: black;">次，增幅</span><span style="color: black;"><span style="color: black;">41%</span></span><span style="color: black;">；</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;">延庆分<span style="color: black;">机构</span></span></strong><span style="color: black;">：</span><span style="color: black;"><span style="color: black;"><strong style="color: blue;">4G</strong></span></span><strong style="color: blue;"><span style="color: black;">流量占比<span style="color: black;">提高</span></span></strong><strong style="color: blue;"><span style="color: black;"><span style="color: black;">0.4%</span></span></strong><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">用户数增幅</span><span style="color: black;"><span style="color: black;">11%</span></span><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">基于<span style="color: black;">测绘</span>的重定向次数由日均</span><span style="color: black;"><span style="color: black;">2215</span></span><span style="color: black;">次</span><span style="color: black;">减少到</span><span style="color: black;"><span style="color: black;">0</span></span><span style="color: black;">，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">2G</span></span><span style="color: black;">盲重定向次数由日均</span><span style="color: black;"><span style="color: black;">67899</span></span><span style="color: black;">次<span style="color: black;">增多</span>到</span><span style="color: black;"><span style="color: black;">91364</span></span><span style="color: black;">次，增幅</span><span style="color: black;"><span style="color: black;">35%</span></span><span style="color: black;">。</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;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7kQrEVlJTZRRXIicGrJvmVfiaBxRrMNRKiaCtLzh803JHhHqyFCicsM7gYh6qQkIIf3VyPiclE1TDhFSA/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">截止</span><span style="color: black;"><span style="color: black;">2016</span></span><span style="color: black;">年</span><span style="color: black;"><span style="color: black;">4</span></span><span style="color: black;">月底，在延庆、平谷<span style="color: black;">基本</span>上，完成密云、大兴、城<span style="color: black;">3、</span>城二4个分<span style="color: black;">机构</span>的推广，推广后</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">驻留比均有<span style="color: black;">提高</span>，尤其是城三分<span style="color: black;">机构</span>在弱覆盖区域降低了最小接入电平及互操作门限，</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">驻留比提升更加<span style="color: black;">显著</span>，各分<span style="color: black;">机构</span>统计如下：</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/714NVGEzAN7kQrEVlJTZRRXIicGrJvmVfDklBahBGnTxnibOukzDnufeYWyhZIyBpaJHYbKUKjiaew3mWAicOYosgQ/640?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;"><span style="color: black;">因为</span>互操作简化，删除了</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">频点，减少了终端</span><span style="color: black;"><span style="color: black;">eSRVCC </span></span><span style="color: black;">过程中的<span style="color: black;">测绘</span>时延，使终端<span style="color: black;">测绘</span></span><span style="color: black;"><span style="color: black;">GSM</span></span><span style="color: black;">更加准确，<span style="color: black;">因此呢</span></span><span style="color: black;"><span style="color: black;">Volte eSRVCC</span></span><span style="color: black;">成功率<span style="color: black;">显著</span><span style="color: black;">提高</span>，其中城三和密云分<span style="color: black;">机构</span><span style="color: black;">因为</span>优化了最小接入电平及互操作门限<span style="color: black;">引起</span>弱场下</span><span style="color: black;"><span style="color: black;">bSRVCC</span></span><span style="color: black;">次数<span style="color: black;">显著</span><span style="color: black;">增多</span>，当前</span><span style="color: black;"><span style="color: black;">bSRVCC</span></span><span style="color: black;">设备不支持，<span style="color: black;">因此呢</span>成功率未见<span style="color: black;">显著</span><span style="color: black;">提高</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;">下一步</span><span style="color: black;">计划分</span><span style="color: black;">3</span>批五月底前完成全网推广工作。</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;"><span style="color: black;">2、</span>互操作简化原则及<span style="color: black;">方法</span></span></strong></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">Volte</span><span style="color: black;">引入后</span><span style="color: black;">LTE</span><span style="color: black;">网络的</span><span style="color: black;"><span style="color: black;">2G/3G/4G</span></span><span style="color: black;">互操作状态增至</span><span style="color: black;">13</span><span style="color: black;">种，参数近百个，邻区</span><span style="color: black;">60</span><span style="color: black;">多个，<span style="color: black;">繁杂</span>度高。</span><span style="color: black;">2016</span><span style="color: black;">年</span><span style="color: black;">TDS</span><span style="color: black;">逐步退网，</span><span style="color: black;">4G</span><span style="color: black;">网络建设更加完善，为了进一步<span style="color: black;">提高</span></span><span style="color: black;">4G</span><span style="color: black;">用户感知，并简化终端互操作，降低网络参数配置<span style="color: black;">繁杂</span>度，网优中心牵头全面实施</span><span style="color: black;">2G/3G/4G</span><span style="color: black;">互操作简化。总体原则如下：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">关闭</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">数据业务互操作（含空闲态重选及连接态重定向），<span style="color: black;">保存</span>现有</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">数据业务互操作</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;">保存</span></span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">2G</span></span><span style="color: black;">数据业务互操作（含空闲态重选及连接态重定向），<span style="color: black;">保存</span></span><span style="color: black;"><span style="color: black;">2G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">数据业务互操作</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;">适当<span style="color: black;">调节</span></span>4G</span></span><span style="color: black;">与</span><span style="color: black;"><span style="color: black;">2G</span></span><span style="color: black;">、</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">数据业务互操作参数（含空闲态重选及连接态重定向参数），以<span style="color: black;">增多</span>用户在</span><span style="color: black;"><span style="color: black;">4G</span></span><span style="color: black;">的驻留</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;">Volte</span></span><span style="color: black;">互操作参数保持不变</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">为兼顾语音感知，<span style="color: black;">已然</span>做了</span><span style="color: black;"><span style="color: black;">CSFB</span></span><span style="color: black;">到</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">的小区<span style="color: black;">保存</span>到</span><span style="color: black;"><span style="color: black;">3G</span></span><span style="color: black;">的互操作策略不变</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">基于<span style="color: black;">以上</span>原则，网优中心分别制定了华为、中兴、诺基亚三个厂家的互操作简化<span style="color: black;">方法</span>：</span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;"><img src="http://mmbiz.qpic.cn/mmbiz/714NVGEzAN7kQrEVlJTZRRXIicGrJvmVfeeY54ZcRN5KWnSyKkUEwyXyeUdia33DI9x6hicwzOAUbLmj2vcx7w7DQ/640?wx_fmt=png&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 50%; margin-bottom: 20px;"></span></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">简化后，在</span><span style="color: black;">2G</span><span style="color: black;">高倒流场景，可尝试优化最小接入电平、</span><span style="color: black;">4G->2G</span><span style="color: black;">的重选门限和盲重定向门限及</span><span style="color: black;">2G</span><span style="color: black;">返回</span><span style="color: black;">4G</span><span style="color: black;">的重选门限，以引导用户<span style="color: black;">尽可能</span>驻留在</span><span style="color: black;">4G</span><span style="color: black;">网络。</span></p>
外贸B2B平台有哪些？ 我完全同意你的看法，期待我们能深入探讨这个问题。
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