?？诮ㄔ鞄熍嘤?/title> <meta name="keywords" content="?？诮ㄔ鞄熍嘤? /> <meta name="description" content="?？诮ㄔ鞄熍嘤?，一建報班可以讓自己的備考更有規劃。一級建造師鐵路工程1L42熟悉GSM、CDMA網絡特點1L42熟悉GSM、CDMA網絡特點(一級建造師考試鐵路工程GSM網絡相關考點)一、GSM移動通信系" /> <meta name="applicable-device"content="pc" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,Chrome=1" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <meta http-equiv="Cache-Control" content="no-transform" /> <script type="text/javascript"> (function(){var reWriteUrl=function(url){if(url){var Splits=url.split("/"),siteName=window.location.pathname;if(typeof siteName!=="undefined"){return"http://m.shudouzi.com"+siteName}}};if(/Android|webOS|iPhone|iPad|Windows Phone|iPod|BlackBerry|SymbianOS|Nokia|Mobile/i.test(navigator.userAgent)){var url=window.location.href;var pathname=window.location.pathname;if(url.indexOf("?pc")<0){try{window.location.href=reWriteUrl(url)}catch(e){}}}})(); </script> <link 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。(一級建造師考試鐵路工程GSM網絡相關考點)</p><p>GSM頻率復用是指在不同間隔區域使用相同頻率進行覆蓋。GSM無線網絡規劃基本上采用4 x 3 頻率復用方式。</p><p>(三)GSM采用的多址技術</p><p>(四)GSM信道</p><p>GSM中的信道分為物理信道和邏輯信道，一個物理信道就是頻寬200kHz，時長為0. 577ms的物理實體。邏輯信道又分為兩大類：業務信道和控制信道。</p><p>1.業務信道(TGH)：用于傳送編碼后的話音或客戶數據。在上行和下行信道上，點對點(BTS對一個MS，或反之)方式傳播.</p><p>2.控制信道：用于傳送信令或同步數據。根據所需完成的功能又把控制信道定義成廣播、公共及專用三種控制信道。</p><p>(五)GSM通信系統的構成，</p><p>GSM通信系統主要由移動交換子系統(NSS) 、基站子系統(BSS)和移動臺(MS)三大部分組成。其中NSS與BSS之間的接口為A接口，BSS與MS之間的接口為Um接口。GSM規范對系統的A接口和Um接口都有明確的規定，也就是說，A接口和Um接口是開放的接口。</p><p>(六)切換</p><p>處于通話狀態的移動用戶從一個基站子系統(BSS)移動到另一個BSS時，切換功能保持移動用戶已經建立的鏈路不被中斷。切換包括BSS內部切換、BSS間的切換和MSS間的切換。其中BSS間的切換和MSS間的切換都需要一由MSC來控制完成，而BSS內部切換由BSC控制完成。</p><p>以上就是關于?？诮ㄔ鞄熍嘤柕脑敿毥榻B，數豆子將為大家分享更多一級建造師培訓相關內容。</p> </div> <div id="4gyo4m4" class="advert"> <b>云私塾6.0試學版-一級建造師</b> <p>2023一級建造師云私塾Pro，AI智能學習平臺，大數據動態預測通過率。72小時有效！</p> <span><a target="_blank">免費領取</a></span> </div> <div id="qk4s44c" class="correlation"> <div id="y44mu8y" class="h3">相關文章</div> <ul> <li><a href="http://www.qiuxia222.com/yijian/48515.html" 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