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NB-IoT終端射頻測試全接觸---CMW測試方案簡介

日期：2025-11-07 05:53

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摘要：<p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> NB-IoT（Narrowband IoT）是未來智能社會實現(xiàn)萬物互聯(lián)的重要支撐技術(shù)。它從設(shè)計之初就得到了業(yè)內(nèi)的廣泛關(guān)注。隨著技術(shù)路線圖的確定和產(chǎn)業(yè)鏈上下游的充分發(fā)展，NB-IoT技術(shù)已在世界多地呈現(xiàn)出高速成長的態(tài)勢。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 在我國，三家主要電信運營商都已積極投入資源參與NB-IoT網(wǎng)絡(luò)的建設(shè)和試驗工作，并逐步開展了商業(yè)運營。從終端角度來說，已有不少物聯(lián)網(wǎng)模組企業(yè)推出了較為成熟產(chǎn)品，終端品種將越來越豐富。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 根據(jù)歷史經(jīng)驗，隨之而來的NB-IoT終端產(chǎn)品測試問題將成為一個業(yè)內(nèi)各單位需要共同應(yīng)對的挑戰(zhàn)，國內(nèi)權(quán)威檢測機構(gòu)泰爾實驗室已在2017年底宣布開展NB-IoT終端的入網(wǎng)準(zhǔn)入測試，因此，無線終端產(chǎn)業(yè)的從業(yè)人員很有必要深入學(xué)習(xí)和掌握這門新技術(shù)的規(guī)范化測試方法以及測試工具的使用。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px 0em;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;">  1.  技術(shù)特點 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> NB-IoT的主要技術(shù)特點可簡述如下： <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 1） NB-IoT相比其它技術(shù)有著小帶寬（180 KHz，含保護帶寬為200KHz）；高靈敏度（應(yīng)對諸多極限連接場景）；大容量、多連接（每小區(qū)可容納5萬個連接）；極低功耗（電池壽命需要達到數(shù)年以上）；允許高時延（*大可到10秒）；低成本（單模塊幾美元）等突出特點 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 2） NB-IoT和LTE有著密切的關(guān)系，其底層形態(tài)和協(xié)議棧結(jié)構(gòu)與LTE有很多共同之處，核心網(wǎng)絡(luò)則繼承和發(fā)展了LTE的EPC模式 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 3） 使用FDD的半雙工模式，目前已分配的工作頻段包括1, 2, 3, 5, 8, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 28, 31, 66 ,70等。它可獨立部署，也可在LTE系統(tǒng)的保護頻帶上部署，還可以在LTE已規(guī)劃頻段內(nèi)部署 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 4） 射頻傳輸總帶寬為180KHz，即LTE 1個RB的寬度；下行采用OFDMA多址方式，子載波間隔15KHz，QPSK調(diào)制方式；上行采用SC-FDMA方式，支持15KHz和3.75KHz兩種子載波間隔，根據(jù)上行方向共享傳輸信道的格式的不同，上線支持單載波（single tone）和多載波(multi-tone)調(diào)度方式，分別使用BPSK和QPSK調(diào)制方式，對應(yīng)不同工作場景 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 5） 下行方向時域采用了和LTE相類似的“符號-時隙-子幀-幀”結(jié)構(gòu)，另外還設(shè)計了一個“超幀”概念，它包括1024個幀，時長約3小時左右；上行方向如果采用15KHz信道間隔，則時頻結(jié)構(gòu)與下行類似，如果采用3.75KHz信道間隔，則時隙長度擴展成了2毫秒，即15 KHz信道間隔時的4倍，而每時隙內(nèi)符號數(shù)保持不變 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 6） 上行方向的功率控制，除了考慮小區(qū)允許*大發(fā)射功率的限制，還需要考慮分配給終端的子載波個數(shù)、開環(huán)起始目標(biāo)功率及路損的影響，受開環(huán)功率控制的影響較大 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 7） 下行信道有窄帶物理廣播（NPBCH）、窄帶物理下行共享（NPDSCH）和窄帶物理下行控制（NPDCCH）等；上行信道有窄帶物理隨機接入（NPRACH）和窄帶物理上行共享（NPUSCH）。下行物理層信號有窄帶主輔同步和窄帶參考信號，上行物理層有解調(diào)參考信號 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 8） 考慮到低成本，低功耗，大連接，且移動性管理場景需求不強烈的特點，NB-IoT在RRC層信令、系統(tǒng)消息、尋呼過程、接入過程、數(shù)據(jù)鏈路構(gòu)成和傳輸方式等方面都進行了很多簡化；為增強覆蓋性能，還設(shè)計了雙向重復(fù)傳輸（Repetition）模式，*大允許200次重傳 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 9） 支持功耗節(jié)省模式（Power Saving Mode）和增強型不連續(xù)接收（eDRX），以減小電池的消耗 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 10）下行方向速率*大可達250kbps，上行方向速率*大可到20kbps <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 關(guān)于NB-IoT的技術(shù)細節(jié)，建議閱讀Rohde & Schwarz公司的技術(shù)白皮書< Narrowband Internet of Things >，文檔編號1MA266。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <h1 style="margin:0px;padding:0px;font-weight:400;font-size:16px;max-width:100%;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:normal;background-color:#FFFFFF;box-sizing:border-box !important;word-wrap:break-word !important;"> 2. 射頻測試需求 </h1> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> NB-IoT在3GPP規(guī)范體系的R13版本中正式推出，其終端射頻一致性測試要求并未單獨發(fā)布，而是與eMTC、V2X等新技術(shù)一起包括在LTE終端測試規(guī)范TS 36.521當(dāng)中，并隨該規(guī)范的不斷更新而持續(xù)完善。通過研讀R14版本規(guī)范（2017年9月份發(fā)布）可知，NB-IoT射頻一致性測試要求區(qū)分為發(fā)射機和接收機測試兩大類，測試用例分布在3個章節(jié)，即第6章發(fā)射機特性，第7章接收機特性和第8章性能要求之內(nèi)。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 對發(fā)射機測試，需要考察時域的*大/*小功率、*大功率回退、配置功率、開關(guān)時間模板（含接入信道）、以及功率控制等指標(biāo)；調(diào)制域的EVM和頻率誤差、載波泄露與帶內(nèi)發(fā)射等指標(biāo)；頻域的鄰道泄露功率、頻譜發(fā)射模板、占用帶寬、帶外雜散發(fā)射和LTE帶內(nèi)共存等指標(biāo)。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 對接收機則需要分別考察靜態(tài)和衰落條件下的表現(xiàn)。靜態(tài)信道下接收機測試包括了重傳和非重傳條件下的**靈敏度、*大輸入電平、鄰道抑制、帶內(nèi)和帶外阻塞、雜散響應(yīng)和寬帶互調(diào)等指標(biāo)。衰落信道下接收機測試考察終端對NPDSCH和NPDCCH信道的解調(diào)能力，具體包括LTE帶內(nèi)部署、單獨部署和LTE帶間部署情況下；基站單天線和分集發(fā)射共四種不同場景。以上大多數(shù)收發(fā)測試用例都會根據(jù)上行信號的調(diào)制方式、子載波間隔等預(yù)置條件的不同而進行多次測試。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <h1 style="margin:0px;padding:0px;font-weight:400;font-size:16px;max-width:100%;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:normal;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;word-wrap:break-word !important;"> 3. 其它典型實驗室測試需求 </h1> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 除上述射頻一致性測試要求之外，根據(jù)應(yīng)用場景的需要，開發(fā)人員通常還要完成下面這些復(fù)雜測試任務(wù)： <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 1) NB-IoT只設(shè)計了數(shù)據(jù)傳輸應(yīng)用，IP層的相關(guān)功能、業(yè)務(wù)能力的驗證就顯得非常必要 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 2) NB-IoT終端對電池壽命的要求非常苛刻，必須進行**的電流測試以保證設(shè)計達標(biāo) <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 3) NB-IoT做為全新的接入網(wǎng)技術(shù)，協(xié)議棧只能逐漸的成熟完善，早期與信令消息相關(guān)的測試和問題定位的需求很迫切 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 4) NB-IoT終端可能攜帶敏感信息，如何保障IP系統(tǒng)的**，如何對抗“黑客”的入侵 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 4.  CMW測試方案簡介 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> NB-IoT終端的一個基本定位是“低成本”，但是從上面的說明可以看到，NB-IoT相關(guān)的射頻測試要求卻非常高，這就意味著需要投入足夠的資源才能從測試的角度保證產(chǎn)品性能的可靠。如何平衡研發(fā)、生產(chǎn)的測試投入與經(jīng)濟效益產(chǎn)出之間的關(guān)系，難度不小，用戶希望的是使用適當(dāng)?shù)耐顿Y就獲得功能強大的NB-IoT測試平臺。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> Rohde & Schwarz公司的CMW500射頻測試儀恰恰為所有這些需求都提供了良好的解決方案。CMW500不僅支持主流的2/3/4G移動通信標(biāo)準(zhǔn)和WLAN、藍牙這些短距無線連接技術(shù)，現(xiàn)又將其測試能力擴展到了NB-IoT和eMTC等物聯(lián)網(wǎng)新興技術(shù)領(lǐng)域。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 在LTE時代，CMW500憑借優(yōu)異的表現(xiàn)而成為產(chǎn)業(yè)界事實的標(biāo)桿。而對NB-IoT技術(shù)，用戶只需在CMW500平臺上做一定的軟硬件升級，即可獲得**的終端測試能力。考慮到LTE和NB-IoT高度融合的特性，在一個平臺上平穩(wěn)升級的方案，無論在能力的兼容、可靠性和精度的保證，還是既有投資的保護，都是一個非常好的選擇。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> CMW500的*新固件版本已支持NB-IoT的信令和非信令測試，尤其需要指出的是，它的信令（基站模擬）功能非常優(yōu)良，用它可以簡化測試，幫助用戶驗證更多的問題，CMW500是目前市場上僅有的幾種支持NB-IoT信令模式的儀表之一。 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 通過儀表的用戶界面和實測結(jié)果可以看到，CMW500支持設(shè)定NB-IoT基站的基礎(chǔ)參數(shù)，主要包括： <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;letter-spacing:0.5px;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 1)  頻段、信道；雙工方式；子載波間隔（15或3.75KHz）；小區(qū)ID；部署模式（單獨部署、LTE保護帶內(nèi)或LTE頻段共存部署）；終端側(cè)接收到的NRS參考信號的強度等 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 2)  可支持單純的射頻測試連接（僅底層協(xié)議）和數(shù)據(jù)應(yīng)用模式連接（含IP等高層協(xié)議）。在射頻測試連接模式下，可設(shè)置不同類型鏈路類型，如專門用于發(fā)射、接收測試的“UL RMC”和“DL RMC”模式，載波數(shù)量和其起始位置、調(diào)制指數(shù)等信息可以調(diào)節(jié)；針對數(shù)據(jù)應(yīng)用模式，可設(shè)置有收發(fā)雙向數(shù)據(jù)的用戶自定義模式，以便同時連續(xù)調(diào)度上行和下行數(shù)據(jù)，相對“UL RMC”和“DL RMC”更加靈活 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 3)  NPRACH/NPUSCH信道功率控制相關(guān)設(shè)置，如空口NB-IoT參考信號強度，期望的初始接入信號強度，NPUSCH的P0期望功率和路損因子α等參數(shù) <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 4)  網(wǎng)絡(luò)PLMN設(shè)置；**相關(guān)設(shè)置，包括測試USIM卡相關(guān)參數(shù)；網(wǎng)絡(luò)側(cè)加擾的打開或關(guān)閉 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 5)  NPDSCH和NPUSCH重復(fù)模式的設(shè)置 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;line-height:1.5em;background-color:#FFFFFF;box-sizing:border-box !important;"> 6)  可支持PSM模式和eDRX相關(guān)參數(shù)設(shè)置 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-backh="469" data-backw="558" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz5W7LmKhA6lq1XIib7vRJzic0YPT0WibvrZwynQltz7lGl0eDkdNEialNvw/0?wx_fmt=png" data-cropx1="0" data-cropx2="606" data-cropy1="0" data-cropy2="510.43010752688167" data-ratio="0.8415841584158416" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz0sNtwTHmiammpBXTiaHAVCuQl8DmLsPrWw6yadBKSaRBqQib6R1O8j02g/640?wx_fmt=jpeg" data-type="jpeg" data-w="606" _width="100%" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz0sNtwTHmiammpBXTiaHAVCuQl8DmLsPrWw6yadBKSaRBqQib6R1O8j02g/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;width:668px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖1 NB-IoT 基站**設(shè)置菜單 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 從測量能力上可以看到，CMW500的NB-IoT測試應(yīng)用工具具備如下功能： <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 1)  終端基本信息的獲取，如注冊狀態(tài)，IMEI/IMSI等身份信息，終端能力等級；默認承載的建立和IP地址的分配 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzTc2GFmBBNxOw4ndia4cqmMUia3iaWYn4LG1MheIrVg01ooEV8EibI8Tcuw/640?wx_fmt=png" data-cropx1="0" data-cropx2="668" data-cropy1="0" data-cropy2="466.8817204301076" data-ratio="0.7001499250374813" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzkn4KiabYib0Dl7jth2TqybTPkordqLmsAdZyUavgJQFoh5deiaoPOynrQ/640?wx_fmt=jpeg" data-type="jpeg" data-w="667" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzkn4KiabYib0Dl7jth2TqybTPkordqLmsAdZyUavgJQFoh5deiaoPOynrQ/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖2 NB-IoT 基站基礎(chǔ)設(shè)置，以及數(shù)據(jù)應(yīng)用模式（Data Application）連接下終端身份信息的獲取，IP地址的分配 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 2)  終端與儀表之間交互的所有信令消息，可通過CMWmars工具記錄、查看和分析 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzsR46w0yeXbaY4574NFOzCDibSaWmwYpiaq6tpNxK06DRyFM7N4cAAkcQ/0?wx_fmt=png" data-cropx1="0" data-cropx2="980" data-cropy1="0" data-cropy2="446.09318996415766" data-ratio="0.45510204081632655" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzCWqQY9kRw2RHmpYzltahFa45Asvzc8O6x821vI4QUTUMFYWicIibQsgQ/640?wx_fmt=jpeg" data-type="jpeg" data-w="980" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzCWqQY9kRw2RHmpYzltahFa45Asvzc8O6x821vI4QUTUMFYWicIibQsgQ/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖3 正常注冊過程中，NB-IoT終端和CMW500之間的信令交互 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 3）  發(fā)射機，接收機射頻測試，可針對功率（包括功率回退、配置功率、開關(guān)時間模板等）、調(diào)制性能（EVM，F(xiàn)requency/Phase Error, IBE等）、頻譜（頻譜模板、占用帶寬）、BLER和物理層吞吐量等基礎(chǔ)指標(biāo)進行全方位測量。可針對NPUSCH和NPRACH兩種信道分別進行測試。目前CMW500配合信號源、頻譜儀等設(shè)備，可以完成上述3GPP測試規(guī)范中第6、7章的24個用例的測試，覆蓋面達到86%。這兩章剩余的4個用例以及第8章的4個用例也在開發(fā)過程當(dāng)中。詳情可以通過R&S公司提供的CMW500測試能力列表文檔了解 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzTPloHkJsrQBQhAJVsiaVxR6DBh2aJicAG9qjj2VWANYbm0LvaodCofLQ/0?wx_fmt=png" data-cropx1="0" data-cropx2="718.9999999999999" data-cropy1="0" data-cropy2="520.5663082437276" data-ratio="0.7204450625869263" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzyvWqMAVbM5nDHECYMxlusibyEx818XBr2kIxQZE0qT5hqHjbKf7nQ7Q/640?wx_fmt=jpeg" data-type="jpeg" data-w="719" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzyvWqMAVbM5nDHECYMxlusibyEx818XBr2kIxQZE0qT5hqHjbKf7nQ7Q/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖4 發(fā)射機測試，NPUSCH信道測試結(jié)果 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz6zs4KFFgAR9ickuce4Cy2IM0WzxU4oBcYWalD58tsOgqia2ahzH5qicQA/0?wx_fmt=png" data-cropx1="0" data-cropx2="750" data-cropy1="0" data-cropy2="541.6666666666667" data-ratio="0.7213333333333334" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz5NbCickpr0VwMnhOC2TbRSQJH2Cm2rgnSXq7yFxW9XH8jryrYIvF0JA/640?wx_fmt=jpeg" data-type="jpeg" data-w="750" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz5NbCickpr0VwMnhOC2TbRSQJH2Cm2rgnSXq7yFxW9XH8jryrYIvF0JA/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖5 發(fā)射機測試，NPRACH信道測試結(jié)果 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzC0we735jL8gLnoVLbVHyr78zJcDZkOppTOFBtGtmibxNiaKpw5icHu6LQ/0?wx_fmt=png" data-cropx1="0" data-cropx2="698" data-cropy1="0" data-cropy2="525.3763440860215" data-ratio="0.7507163323782235" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzLEQ94hCoyJxnJ7vTdRHjdsxfzokISicgl8LZhMmwVWy404BLCficgCfg/640?wx_fmt=jpeg" data-type="jpeg" data-w="698" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzLEQ94hCoyJxnJ7vTdRHjdsxfzokISicgl8LZhMmwVWy404BLCficgCfg/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖6 接收機測試，包括BLER和吞吐量等指標(biāo) <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 4)  可以根據(jù)NPUSCH信道觸發(fā)測量，測試更精準(zhǔn)；不僅可以給出單純的數(shù)值形式結(jié)果，還可提供豐富的圖形結(jié)果，信息量豐富 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 5)  IP層相關(guān)測試，CMW500支持通過控制面（C-Plane）和用戶面（U-Plane）承載IP數(shù)據(jù)，使用者可以運行PING以及Iperf灌包等IP層工具驗證終端業(yè)務(wù)能力，并通過CMW500提供的IP抓包和IP**分析工具來進行問題定位和網(wǎng)絡(luò)**性能驗證 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzBfmN9bFX1kWIjBCz3jicAfzUJiceiaiciaCySmfyxicM1J9H9Q1Tn7kSoaHQ/640?wx_fmt=png" data-cropx1="0" data-cropx2="674" data-cropy1="0" data-cropy2="430.00716845878134" data-ratio="0.6364985163204748" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz68hDE4ZMJg0nbrqD6YldRIqIURlYJtZrXrLKGmg7EobU6Z4BmreSag/640?wx_fmt=jpeg" data-type="jpeg" data-w="674" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUz68hDE4ZMJg0nbrqD6YldRIqIURlYJtZrXrLKGmg7EobU6Z4BmreSag/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖7 NB-IoT 的數(shù)據(jù)應(yīng)用模式連接下，從 CMW500 向終端發(fā)起 PING測試，可見 PING 時延在 2 秒以上，符合 NB-IoT 低速連接的技術(shù)特點 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzjnDKxtLzickUhhNJkV05uT0JoybDmHHEwnZY5gFWrSQicp5k5JlAZUyg/0?wx_fmt=png" data-cropx1="0" data-cropx2="609" data-cropy1="0" data-cropy2="446.3817204301076" data-ratio="0.7323481116584565" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzo69cfLD21cTiaRZjUKNJ7RHF9Tk0SyOjTaYP8HY6UwqyX42ic7CwHzGA/640?wx_fmt=jpeg" data-type="jpeg" data-w="609" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzo69cfLD21cTiaRZjUKNJ7RHF9Tk0SyOjTaYP8HY6UwqyX42ic7CwHzGA/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖8 數(shù)據(jù)應(yīng)用連接下的Iperf灌包測試，可見左側(cè)具有極低的綠色上行速度，表明CMW500接收到了終端發(fā)出的UPD數(shù)據(jù)包 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzlEMgPwCc7WcuIXu2KUPnMDicJokFwzSRdCWdTTemc4UJdx7razoEqww/0?wx_fmt=png" data-cropx1="0" data-cropx2="616" data-cropy1="0" data-cropy2="408.4587813620072" data-ratio="0.6607142857142857" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzapMFuvbkDhMY4Hl53bibsu2wJ387Rg7wlGBYgzHfNcj6iaW02tiapCeNw/640?wx_fmt=jpeg" data-type="jpeg" data-w="616" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzapMFuvbkDhMY4Hl53bibsu2wJ387Rg7wlGBYgzHfNcj6iaW02tiapCeNw/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖9 使用IP**分析工具，記錄下NB-IoT終端訪問的真實網(wǎng)站的位置信息 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 6)  非信令測試模式下，ARB信號源可播放使用R&S WinIQSIM2軟件工具制作的非信令波形文件，發(fā)射機測量工具可脫離信令模塊單獨工作，滿足生產(chǎn)線相關(guān)的模塊校準(zhǔn)和驗證測試要求，節(jié)省投資 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 7)  配合使用CMWrun自動化測試軟件，可高效完成終端射頻測試，腳本編輯方便，用戶界面友好 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzY0ZVAhQicphHq8Hw5lib1A7tbWPAKOftPEm3zRXyOcfNZ4nP2ZY7We6A/0?wx_fmt=png" data-cropx1="0" data-cropx2="671" data-cropy1="0" data-cropy2="393.22043010752685" data-ratio="0.587183308494784" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUziaZCn7ZZozcFchDSO1OJicQXIa6nEkUGwkDCWCibc5wqa1NCkxIRcN0icg/640?wx_fmt=jpeg" data-type="jpeg" data-w="671" _width="558px" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUziaZCn7ZZozcFchDSO1OJicQXIa6nEkUGwkDCWCibc5wqa1NCkxIRcN0icg/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;width:558px !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖10 CMWrun NB-IoT射頻測試腳本覆蓋發(fā)射、接收測量 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 8)  配合使用R&S RT-ZVC多通道功率探頭和CMWrun自動化測試軟件，可進行NB-IoT終端，尤其是在使用真實電池的情況下，電流的變化情況，CMW500模擬網(wǎng)絡(luò)各種行為，并提供準(zhǔn)確的信令動作觸發(fā)RT-ZVC的測量，以便記錄下注冊、發(fā)起數(shù)據(jù)連接等關(guān)鍵時間節(jié)點功耗的變化，測試全程自動化進行 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;line-height:25.6px;white-space:normal;widows:1;background-color:#FFFFFF;box-sizing:border-box !important;"> <img class="" data-backh="411" data-backw="493" data-croporisrc="https://mmbiz.qpic.cn/mmbiz_png/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzsTIIYdnK5DpwsmvapLSxbHUo59TbLHXeE5whVEgz5aI4USun0VCw5w/0?wx_fmt=png" data-cropx1="0" data-cropx2="493" data-cropy1="0" data-cropy2="411" data-ratio="0.8353658536585366" data-s="300,640" data-src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzEApt9CiadMBN2ODibCzibibL9sZ2vPZIOBpnxd1Yr07MChmSADHYfsxHiag/640?wx_fmt=jpeg" data-type="jpeg" data-w="492" _width="100%" src="https://mmbiz.qpic.cn/mmbiz_jpg/rPocLiaxQfewIGH697Wk8ftLA2cibjiaWUzEApt9CiadMBN2ODibCzibibL9sZ2vPZIOBpnxd1Yr07MChmSADHYfsxHiag/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1" data-fail="0" style="margin:0px;padding:0px;width:668px;height:auto !important;box-sizing:border-box !important;word-wrap:break-word !important;visibility:visible !important;" /> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:center;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 圖12 RT-ZAC多通道探頭與CMW500配合測量NB-IoT終端的電流消耗 <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> <p style="margin-top:0px;margin-bottom:0px;padding:0px;max-width:100%;clear:both;min-height:1em;color:#3E3E3E;font-family:"Helvetica Neue", Helvetica, "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;font-size:16px;font-variant-numeric:normal;font-variant-east-asian:normal;white-space:normal;widows:1;text-align:justify;line-height:1.5em;letter-spacing:0.5px;background-color:#FFFFFF;box-sizing:border-box !important;"> 面對物聯(lián)網(wǎng)技術(shù)的快速發(fā)展，Rohde & Schwarz公司已做好準(zhǔn)備，CMW500射頻測試儀將用優(yōu)良的表現(xiàn)，繼續(xù)為用戶的測試工作提供可靠、準(zhǔn)確的保障。Rohde & Schwarz公司愿和業(yè)內(nèi)同仁一起攜手，為我國NB-IoT產(chǎn)業(yè)的持續(xù)發(fā)展貢獻力量。

NB-IoT（Narrowband IoT）是未來智能社會實現(xiàn)萬物互聯(lián)的重要支撐技術(shù)。它從設(shè)計之初就得到了業(yè)內(nèi)的廣泛關(guān)注。隨著技術(shù)路線圖的確定和產(chǎn)業(yè)鏈上下游的充分發(fā)展，NB-IoT技術(shù)已在世界多地呈現(xiàn)出高速成長的態(tài)勢。

在我國，三家主要電信運營商都已積極投入資源參與NB-IoT網(wǎng)絡(luò)的建設(shè)和試驗工作，并逐步開展了商業(yè)運營。從終端角度來說，已有不少物聯(lián)網(wǎng)模組企業(yè)推出了較為成熟產(chǎn)品，終端品種將越來越豐富。

根據(jù)歷史經(jīng)驗，隨之而來的NB-IoT終端產(chǎn)品測試問題將成為一個業(yè)內(nèi)各單位需要共同應(yīng)對的挑戰(zhàn)，國內(nèi)權(quán)威檢測機構(gòu)泰爾實驗室已在2017年底宣布開展NB-IoT終端的入網(wǎng)準(zhǔn)入測試，因此，無線終端產(chǎn)業(yè)的從業(yè)人員很有必要深入學(xué)習(xí)和掌握這門新技術(shù)的規(guī)范化測試方法以及測試工具的使用。

1. 技術(shù)特點

NB-IoT的主要技術(shù)特點可簡述如下：

1） NB-IoT相比其它技術(shù)有著小帶寬（180 KHz，含保護帶寬為200KHz）；高靈敏度（應(yīng)對諸多極限連接場景）；大容量、多連接（每小區(qū)可容納5萬個連接）；極低功耗（電池壽命需要達到數(shù)年以上）；允許高時延（*大可到10秒）；低成本（單模塊幾美元）等突出特點

2） NB-IoT和LTE有著密切的關(guān)系，其底層形態(tài)和協(xié)議棧結(jié)構(gòu)與LTE有很多共同之處，核心網(wǎng)絡(luò)則繼承和發(fā)展了LTE的EPC模式

3）使用FDD的半雙工模式，目前已分配的工作頻段包括1, 2, 3, 5, 8, 11, 12, 13, 17, 18, 19, 20, 21, 25, 26, 28, 31, 66 ,70等。它可獨立部署，也可在LTE系統(tǒng)的保護頻帶上部署，還可以在LTE已規(guī)劃頻段內(nèi)部署

4）射頻傳輸總帶寬為180KHz，即LTE 1個RB的寬度；下行采用OFDMA多址方式，子載波間隔15KHz，QPSK調(diào)制方式；上行采用SC-FDMA方式，支持15KHz和3.75KHz兩種子載波間隔，根據(jù)上行方向共享傳輸信道的格式的不同，上線支持單載波（single tone）和多載波(multi-tone)調(diào)度方式，分別使用BPSK和QPSK調(diào)制方式，對應(yīng)不同工作場景

5）下行方向時域采用了和LTE相類似的“符號-時隙-子幀-幀”結(jié)構(gòu)，另外還設(shè)計了一個“超幀”概念，它包括1024個幀，時長約3小時左右；上行方向如果采用15KHz信道間隔，則時頻結(jié)構(gòu)與下行類似，如果采用3.75KHz信道間隔，則時隙長度擴展成了2毫秒，即15 KHz信道間隔時的4倍，而每時隙內(nèi)符號數(shù)保持不變

6）上行方向的功率控制，除了考慮小區(qū)允許*大發(fā)射功率的限制，還需要考慮分配給終端的子載波個數(shù)、開環(huán)起始目標(biāo)功率及路損的影響，受開環(huán)功率控制的影響較大

7）下行信道有窄帶物理廣播（NPBCH）、窄帶物理下行共享（NPDSCH）和窄帶物理下行控制（NPDCCH）等；上行信道有窄帶物理隨機接入（NPRACH）和窄帶物理上行共享（NPUSCH）。下行物理層信號有窄帶主輔同步和窄帶參考信號，上行物理層有解調(diào)參考信號

8）考慮到低成本，低功耗，大連接，且移動性管理場景需求不強烈的特點，NB-IoT在RRC層信令、系統(tǒng)消息、尋呼過程、接入過程、數(shù)據(jù)鏈路構(gòu)成和傳輸方式等方面都進行了很多簡化；為增強覆蓋性能，還設(shè)計了雙向重復(fù)傳輸（Repetition）模式，*大允許200次重傳

9）支持功耗節(jié)省模式（Power Saving Mode）和增強型不連續(xù)接收（eDRX），以減小電池的消耗

10）下行方向速率*大可達250kbps，上行方向速率*大可到20kbps

關(guān)于NB-IoT的技術(shù)細節(jié)，建議閱讀Rohde & Schwarz公司的技術(shù)白皮書< Narrowband Internet of Things >，文檔編號1MA266。

2. 射頻測試需求

NB-IoT在3GPP規(guī)范體系的R13版本中正式推出，其終端射頻一致性測試要求并未單獨發(fā)布，而是與eMTC、V2X等新技術(shù)一起包括在LTE終端測試規(guī)范TS 36.521當(dāng)中，并隨該規(guī)范的不斷更新而持續(xù)完善。通過研讀R14版本規(guī)范（2017年9月份發(fā)布）可知，NB-IoT射頻一致性測試要求區(qū)分為發(fā)射機和接收機測試兩大類，測試用例分布在3個章節(jié)，即第6章發(fā)射機特性，第7章接收機特性和第8章性能要求之內(nèi)。

對發(fā)射機測試，需要考察時域的*大/*小功率、*大功率回退、配置功率、開關(guān)時間模板（含接入信道）、以及功率控制等指標(biāo)；調(diào)制域的EVM和頻率誤差、載波泄露與帶內(nèi)發(fā)射等指標(biāo)；頻域的鄰道泄露功率、頻譜發(fā)射模板、占用帶寬、帶外雜散發(fā)射和LTE帶內(nèi)共存等指標(biāo)。

對接收機則需要分別考察靜態(tài)和衰落條件下的表現(xiàn)。靜態(tài)信道下接收機測試包括了重傳和非重傳條件下的**靈敏度、*大輸入電平、鄰道抑制、帶內(nèi)和帶外阻塞、雜散響應(yīng)和寬帶互調(diào)等指標(biāo)。衰落信道下接收機測試考察終端對NPDSCH和NPDCCH信道的解調(diào)能力，具體包括LTE帶內(nèi)部署、單獨部署和LTE帶間部署情況下；基站單天線和分集發(fā)射共四種不同場景。以上大多數(shù)收發(fā)測試用例都會根據(jù)上行信號的調(diào)制方式、子載波間隔等預(yù)置條件的不同而進行多次測試。

3. 其它典型實驗室測試需求

除上述射頻一致性測試要求之外，根據(jù)應(yīng)用場景的需要，開發(fā)人員通常還要完成下面這些復(fù)雜測試任務(wù)：

1) NB-IoT只設(shè)計了數(shù)據(jù)傳輸應(yīng)用，IP層的相關(guān)功能、業(yè)務(wù)能力的驗證就顯得非常必要

2) NB-IoT終端對電池壽命的要求非常苛刻，必須進行**的電流測試以保證設(shè)計達標(biāo)

3) NB-IoT做為全新的接入網(wǎng)技術(shù)，協(xié)議棧只能逐漸的成熟完善，早期與信令消息相關(guān)的測試和問題定位的需求很迫切

4) NB-IoT終端可能攜帶敏感信息，如何保障IP系統(tǒng)的**，如何對抗“黑客”的入侵

4. CMW測試方案簡介

NB-IoT終端的一個基本定位是“低成本”，但是從上面的說明可以看到，NB-IoT相關(guān)的射頻測試要求卻非常高，這就意味著需要投入足夠的資源才能從測試的角度保證產(chǎn)品性能的可靠。如何平衡研發(fā)、生產(chǎn)的測試投入與經(jīng)濟效益產(chǎn)出之間的關(guān)系，難度不小，用戶希望的是使用適當(dāng)?shù)耐顿Y就獲得功能強大的NB-IoT測試平臺。

Rohde & Schwarz公司的CMW500射頻測試儀恰恰為所有這些需求都提供了良好的解決方案。CMW500不僅支持主流的2/3/4G移動通信標(biāo)準(zhǔn)和WLAN、藍牙這些短距無線連接技術(shù)，現(xiàn)又將其測試能力擴展到了NB-IoT和eMTC等物聯(lián)網(wǎng)新興技術(shù)領(lǐng)域。

在LTE時代，CMW500憑借優(yōu)異的表現(xiàn)而成為產(chǎn)業(yè)界事實的標(biāo)桿。而對NB-IoT技術(shù)，用戶只需在CMW500平臺上做一定的軟硬件升級，即可獲得**的終端測試能力。考慮到LTE和NB-IoT高度融合的特性，在一個平臺上平穩(wěn)升級的方案，無論在能力的兼容、可靠性和精度的保證，還是既有投資的保護，都是一個非常好的選擇。

CMW500的*新固件版本已支持NB-IoT的信令和非信令測試，尤其需要指出的是，它的信令（基站模擬）功能非常優(yōu)良，用它可以簡化測試，幫助用戶驗證更多的問題，CMW500是目前市場上僅有的幾種支持NB-IoT信令模式的儀表之一。

通過儀表的用戶界面和實測結(jié)果可以看到，CMW500支持設(shè)定NB-IoT基站的基礎(chǔ)參數(shù)，主要包括：

1) 頻段、信道；雙工方式；子載波間隔（15或3.75KHz）；小區(qū)ID；部署模式（單獨部署、LTE保護帶內(nèi)或LTE頻段共存部署）；終端側(cè)接收到的NRS參考信號的強度等

2) 可支持單純的射頻測試連接（僅底層協(xié)議）和數(shù)據(jù)應(yīng)用模式連接（含IP等高層協(xié)議）。在射頻測試連接模式下，可設(shè)置不同類型鏈路類型，如專門用于發(fā)射、接收測試的“UL RMC”和“DL RMC”模式，載波數(shù)量和其起始位置、調(diào)制指數(shù)等信息可以調(diào)節(jié)；針對數(shù)據(jù)應(yīng)用模式，可設(shè)置有收發(fā)雙向數(shù)據(jù)的用戶自定義模式，以便同時連續(xù)調(diào)度上行和下行數(shù)據(jù)，相對“UL RMC”和“DL RMC”更加靈活

3) NPRACH/NPUSCH信道功率控制相關(guān)設(shè)置，如空口NB-IoT參考信號強度，期望的初始接入信號強度，NPUSCH的P0期望功率和路損因子α等參數(shù)

4) 網(wǎng)絡(luò)PLMN設(shè)置；**相關(guān)設(shè)置，包括測試USIM卡相關(guān)參數(shù)；網(wǎng)絡(luò)側(cè)加擾的打開或關(guān)閉

5) NPDSCH和NPUSCH重復(fù)模式的設(shè)置

6) 可支持PSM模式和eDRX相關(guān)參數(shù)設(shè)置

圖1 NB-IoT 基站**設(shè)置菜單

從測量能力上可以看到，CMW500的NB-IoT測試應(yīng)用工具具備如下功能：

1) 終端基本信息的獲取，如注冊狀態(tài)，IMEI/IMSI等身份信息，終端能力等級；默認承載的建立和IP地址的分配

圖2 NB-IoT 基站基礎(chǔ)設(shè)置，以及數(shù)據(jù)應(yīng)用模式（Data Application）連接下終端身份信息的獲取，IP地址的分配

2) 終端與儀表之間交互的所有信令消息，可通過CMWmars工具記錄、查看和分析

圖3 正常注冊過程中，NB-IoT終端和CMW500之間的信令交互

3）發(fā)射機，接收機射頻測試，可針對功率（包括功率回退、配置功率、開關(guān)時間模板等）、調(diào)制性能（EVM，F(xiàn)requency/Phase Error, IBE等）、頻譜（頻譜模板、占用帶寬）、BLER和物理層吞吐量等基礎(chǔ)指標(biāo)進行全方位測量。可針對NPUSCH和NPRACH兩種信道分別進行測試。目前CMW500配合信號源、頻譜儀等設(shè)備，可以完成上述3GPP測試規(guī)范中第6、7章的24個用例的測試，覆蓋面達到86%。這兩章剩余的4個用例以及第8章的4個用例也在開發(fā)過程當(dāng)中。詳情可以通過R&S公司提供的CMW500測試能力列表文檔了解

圖4 發(fā)射機測試，NPUSCH信道測試結(jié)果

圖5 發(fā)射機測試，NPRACH信道測試結(jié)果

圖6 接收機測試，包括BLER和吞吐量等指標(biāo)

4) 可以根據(jù)NPUSCH信道觸發(fā)測量，測試更精準(zhǔn)；不僅可以給出單純的數(shù)值形式結(jié)果，還可提供豐富的圖形結(jié)果，信息量豐富

5) IP層相關(guān)測試，CMW500支持通過控制面（C-Plane）和用戶面（U-Plane）承載IP數(shù)據(jù)，使用者可以運行PING以及Iperf灌包等IP層工具驗證終端業(yè)務(wù)能力，并通過CMW500提供的IP抓包和IP**分析工具來進行問題定位和網(wǎng)絡(luò)**性能驗證

圖7 NB-IoT 的數(shù)據(jù)應(yīng)用模式連接下，從 CMW500 向終端發(fā)起 PING測試，可見 PING 時延在 2 秒以上，符合 NB-IoT 低速連接的技術(shù)特點

圖8 數(shù)據(jù)應(yīng)用連接下的Iperf灌包測試，可見左側(cè)具有極低的綠色上行速度，表明CMW500接收到了終端發(fā)出的UPD數(shù)據(jù)包

圖9 使用IP**分析工具，記錄下NB-IoT終端訪問的真實網(wǎng)站的位置信息

6) 非信令測試模式下，ARB信號源可播放使用R&S WinIQSIM2軟件工具制作的非信令波形文件，發(fā)射機測量工具可脫離信令模塊單獨工作，滿足生產(chǎn)線相關(guān)的模塊校準(zhǔn)和驗證測試要求，節(jié)省投資

7) 配合使用CMWrun自動化測試軟件，可高效完成終端射頻測試，腳本編輯方便，用戶界面友好

圖10 CMWrun NB-IoT射頻測試腳本覆蓋發(fā)射、接收測量

8) 配合使用R&S RT-ZVC多通道功率探頭和CMWrun自動化測試軟件，可進行NB-IoT終端，尤其是在使用真實電池的情況下，電流的變化情況，CMW500模擬網(wǎng)絡(luò)各種行為，并提供準(zhǔn)確的信令動作觸發(fā)RT-ZVC的測量，以便記錄下注冊、發(fā)起數(shù)據(jù)連接等關(guān)鍵時間節(jié)點功耗的變化，測試全程自動化進行

圖12 RT-ZAC多通道探頭與CMW500配合測量NB-IoT終端的電流消耗

面對物聯(lián)網(wǎng)技術(shù)的快速發(fā)展，Rohde & Schwarz公司已做好準(zhǔn)備，CMW500射頻測試儀將用優(yōu)良的表現(xiàn)，繼續(xù)為用戶的測試工作提供可靠、準(zhǔn)確的保障。Rohde & Schwarz公司愿和業(yè)內(nèi)同仁一起攜手，為我國NB-IoT產(chǎn)業(yè)的持續(xù)發(fā)展貢獻力量。

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NB-IoT終端射頻測試全接觸---CMW測試方案簡介

2. 射頻測試需求

3. 其它典型實驗室測試需求