一, Functions of S1AP
? ? 1,? E-RAB management function
? ? 2, responsible for setting up, modifying and releasing E-RABs, which are triggered by the MME
? ? 3, release and modification of E-RABs may be triggered by the eNB as well
????4, Initial Context Transfer function
? ? ? ? 1), used to establish an S1UE context in the eNB
? ? ? ? 2), to setup the default IP connectivity
? ? ? ? 3), to setup one or more E-RAB if requested by the MME
? ? ? ? 4), to transfer NAS signalling related information to the eNB if needed
? ? 5, UE Capability Info Indication function
????????????used to provide the UE Capability Info when received from the UE to the MME
? ? 6, Mobility functions? (移動性管理)
? ? ? ? ? ? 1), a change of eNBs within SAE/LTE (Inter MME/Serving SAE-GW Handovers) via the S1 interface
? ? ? ? ? ? 2), a change of RAN nodes between different RATs (Inter-3GPP-RAT Handovers) via the S1 interface
? ? 7, Paging
????????provides the EPC with the capability to page the UE
? ? 8, S1 interface management functions
? ? 9, Reset function? (重置功能)
? ? 10, Error Indication funcation? (錯誤指示)
? ? 11, Overload function? ? (負載)
? ? 12, Load balancing function? (負載均衡)
? ? 13, S1 Setup function? ?(S1 設(shè)置)
? ? 14, eNB and MME Configuration Update function? (eNB 和 MME 的配置更新)
? ? 15, NAS Signalling transport function
? ? ? ? ? ? 1), to transfer and reroute NAS signalling related information and to establish the S1 UE context in the eNB
? ? ? ? ? ? 2), to transfer NAS signalling related information when the S1 UE context in the eNB is already established
? ? 16, S1 UE context Release function
? ? 17, UE Context Modification function
? ? 18, UE Context Resumption function? ? (UE Context 恢復(fù))
? ? 19, Status Transfer? ? ?(狀態(tài)轉(zhuǎn)移)
? ? 20, Trace function? ? ? (會話跟蹤)
? ? 21, Location Reporting? ?(位置上報)
? ? 24, LPPa Signalling transport
? ? 25, S1 CDMA2000 Tunnelling function
? ? 26, Warning message transmission function
? ? 27, RAN Information Management (RIM) function
? ? 28, Configuration Transfer function
? ? 29, UE Radio Capability Match function
? ? 30, PWS Restart Indication function
? ? 31, PWS Failure Indication function
? ? 32, Connection Establishment Indication function
? ? 33, Retrieve UE Information function
? ? 34, UE Information Transfer function
? ? 35, CP Relocation function
? ? 36, Report of Secondary RAT data volumes function
? ? 37, QMC function
