【正文】 lease take note that you should only use one design color group per slide. For specific usage details， refer to the “Typesetting Standard”. SIP協(xié)議棧結(jié)構(gòu) ? SIP(Session Initiation Protocol)是 RFC3261中定義的一種 應(yīng)用層協(xié)議 ， 用 來創(chuàng)建、修改和中止一方或多方會話。 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。 Default bearer (GBR) QCI=8/9 Inter APN Default bearer (NonGBR) QCI=5 IMS APN Page 12 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”. EPS 附著 (2) ? 下圖顯示了 IMS附著后 QCI5承 載建立流程 PDN Connectivity Request RRC UL Information Transfer S1AP UL NAS TRANS ERAB SETUP REQ(QCI5) RRC Connection Recfg(ADD EPS Bear) Activate Default EPS Bearer Context request (QCI5) RRC UL Information Transfer S1AP UL NAS TRANS RRC Connection Recfg Cmp Activate Default EPS Bearer Context Accept ERAB SETUP RSP Page 13 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 ? EPS Attachment實例，包含 Combined attach、 QCI9QCI5激活等內(nèi)容 : Page 14 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注冊 ? 當(dāng) VoLTE終端注冊到 IMS APN時會建立一條 QCI5默認(rèn)承載，但此時還不能進(jìn)行 VoLTE通話，因為 VoLTE終端還需要到 IMS上進(jìn)行注冊， SIP注冊消息承載在 QCI5上； ? 下圖顯示了 SIP注冊的基本流程： ? SIP的注冊流程 包 括： 1) Register: UE讀取 IMSI，發(fā)送 Register消息給 CSCF； 2) 401: CSCF 提取和保存 IK和 CK，在 401響應(yīng)中轉(zhuǎn)發(fā) RAND和 AUTN給 UE； 3) Register: UE使用共享秘鑰和 RAND計算 RES，重構(gòu) Register消息，并發(fā)送給 CSCF。 Invite： MO(主叫 )發(fā)起一個 VoLTE呼叫，向 MT(被叫 )發(fā)送一條 Invite請求消息。 UPDATE： UPDATE用來協(xié)商 更新端到端的媒體面參數(shù) 等。 (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)。 ? 2G/3G的核心網(wǎng)需要升級來提供 Sv接口，從而實現(xiàn)對 SRVCC功能的支持。 Page 26 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 – 媒體面 ? 當(dāng) VoLTE并發(fā)數(shù)據(jù)業(yè)務(wù)發(fā)生 SRVCC切換時， MME將在 eMSC的配合下降語音業(yè)務(wù)遷移到傳統(tǒng)網(wǎng)絡(luò)的 CS域，同時將數(shù)據(jù)業(yè)務(wù)遷移到傳統(tǒng)的 PS域。s usage setting (1) 該字段為 0，表明是 Voice centric. (2) 該 字段 為 1， 表明 是 Data centric. B) Voice domain preference for EUTRAN (1) 該 字段為 0，表明是 CS voice only . (2) 該 字段為 1，表 明是 IMS PS voice only (3) 該 字段為 2，表明是 CS voice preferred, IMS PS voice as secondary. (4) 該 字段為 3，表明是 IMS PS voice preferred, CS Voice as secondary. ? 本頁流程圖為當(dāng) UE能力為 “prefer IMS PS Voice with CS Voice as secondary”時， UE進(jìn)行聯(lián)合注冊和網(wǎng)絡(luò)選擇行為。 ? 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。 ? SRVCC切換將 UE從 LTE的 PS域遷移到 UMTS/GSM的 CS域，對應(yīng)的內(nèi)容可以從 “handover Required”消息中看到。 Page 20 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 : F