【正文】 Page 25 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. SRVCC – 控制面流程 ? 從無線側(cè)來 看， SRVCC的切換流程和數(shù)據(jù)業(yè)務(wù)的異系統(tǒng)切換流程沒有區(qū)別。 4) 200 OK: CSCF響應(yīng) 200OK給 UE，來指示基本注冊成功。 Page 4 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. IMS網(wǎng)元 ? VoLTE服務(wù)依賴于 IMS的部署 , IMS是一個新引入的復(fù)雜系統(tǒng)，包含了許多新網(wǎng)元，下表給出了一些典型的 IMS網(wǎng)元： Page 5 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. VoLTE的承載 ? 根據(jù) 3GPP協(xié)議，在進行語音、視頻通話時，需要建立 QCI1/QCI2/QCI5承載，不同的 QCI承 載在協(xié)議中對諸如優(yōu)先級、丟包率等參數(shù)都有相應(yīng)的規(guī)定。 183 session progress： 該響應(yīng)用來指示 會 話正在處理中，一般是 precondition打開時用來指示資源預(yù)留使用，由 MT(被叫 )或 IMS發(fā)送 。 ? eSRVCC通過部署的 ATCF和ATGW 分別作為信令面和媒體面的錨定，將業(yè)務(wù)中斷時延減小到約 300毫秒。 (1)主叫時延 : [Time(180) – Time(Invite)] (2)被叫時延 : [Time(Ack) – Time(200)] (3)E2E時延 :[Caller delay + Called delay] = [Time(180) – Time(Invite)] + [Time(Ack) – Time(200)] ? 主叫時延會受到振鈴類型的影響： (1)早振鈴 : 在 QCI1承載建立之前發(fā)送 180 Ring響應(yīng)。 Page 9 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. SIP消息 ? SIP響應(yīng)是 3位數(shù)的狀態(tài)碼， 用 來指示對請求 消息是 否滿意等。 ? SIP請求以單詞命名，指示消息用途。 Page 18 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. 語音呼叫流程 ? 左 圖為 VoLTE基本呼叫的 MO到 PCSCF(IMS入口網(wǎng)元 )流程圖部分 . ? 呼 叫流程中包括 2類消息內(nèi)容： 一 類是 SIP消息；另一類是層 3消息，其中方框中的消息內(nèi)容為 QCI1的激活 過程 . ? QCI1激活流程由 183 session progress消息觸發(fā) . Page 19 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. 呼叫時延 ? VoLTE呼叫中，呼叫事件是由 SIP消息來表征的， 例 如 180 Ring消息表示被叫振鈴， 200 OK表示被叫摘機，因此呼叫時延使用 SIP消息間隔來定義。 Page 27 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Slide text :2022pt Bullets level 25: 18pt Color:Black Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial Top right corner for fieldmark， customer or partner logotypes. The following nine groups of colors are an example of how our design colors can be used， please take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. 實例 ? SRVCC切換實例及關(guān)鍵信元 . Page 28 Slide title :3235pt Color: R153 G0 B0 Corporate Font : FrutigerNext LT Medium Font to be used by customers and partners : Arial