LTE基础知识.doc

用户附着网络信令流程图初始上下文建立( 默认承载) 安全激活( AS ) ue 能力查询( Optional ) NAS 安全模式( NAS ) 鉴权( NAS : optional ) Rrc 连接建立( srb 1) UE onnectionRequest plete ( attach request ( PDN connectivity request )) plete onnectionSetup mand onnectionReconfiguration ( attach accep t( activate default EPS bearer context request )) Initial UE message ( attach reques t( PDN connectivity request )) Initial Context setup request ( attach accept ( activate default EPS bearer context request )) plete Initail context setup reponse UL Information Transfer ( plete ( activate default EPS bearer context accept )) Uplink Nas transport ( plete ( activate default EPS bearer context accept )) eNB MME Downlink NAS transport ( authentication request ) DL information transfer ( authentication request ) UL information transfer ( authentication response ) Uplink NAS transport ( authentication response ) UE capability info indication UECapabilityEnquiry UECapabilityInformation Downlink NAS transport ( Security mand ) DL information transfer ( Security mand ) UL information transfer ( Security plete Uplink NAS transport ( Security plete ) 开机-> srb 0 建立 PLMN 搜索小区搜索读广播小区驻留建立 rb0 身份认证( NAS : optional ) Downlink NAS transport ( identificaition Request ) DL information transfer ( identificaition Reques t) UL information transfer ( identificaition response ) Uplink NAS transport ( identificaition response ) 小区建立 Rb 0 建立专用承载建立( rdb 4) onnectionReconfiguration ( activateDedicatedEpsBearerContextRequest ) E- RABSetupRequest ( activateDedicatedEpsBearerContextRequest ) plete Initail context setup reponse UL Information Transfer ( Activate dedicated EPS bearer context accept ) Uplink Nas transport ( Activate dedicated EPS bearer context accept ) LTE/SAE 的协议结构 EPC 基本协议栈 EPC 主要控制面接口 S1-MME 接口: 该接口通过 S1AP 消息来交互,通过 SCTP 协议来承载 S1AP 消息。? S11 接口: 该接口为 MME 和 SGW 之间的控制面接口, 通过 GTP-C 消息进行交互, 底层承载使用 UD P 协议。? S5/S8 接口该接口为 SGW 和 PGW 之间的接口,也通过 GTP-C 消息交互,底层承载为 UDP 协议。? Gx 接口该接口为 PCRF 和 PCEF (在 PGW 中)的接口,使用 diameter 消息进行交互,底层承载使