Section: 10.5.5.34 User Plane integrity indicator
Content: The purpose of the User Plane integrity indicator information element is to indicate to the MS that it shall integrity protect user plane data in LLC layer. The User Plane integrity indicator is allocated by the network and sent with the ATTACH ACCEPT message or ROUTING AREA UPDATE ACCEPT message to the mobile station. The User Plane integrity indicator information element is coded as shown in figure 10.5.5.34-1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  and table 10.5.5.34-1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] . In A/Gb mode, in the case when a UMTS security context is established and if the MS supports integrity protection, , the purpose of the User Plane integrity indicator information element is to request the MS to start integrity protection of user plane data in LLC layer. The User Plane integrity indicator is a type 1 information element. Figure 10.5.5.34-1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  User Plane integrity indicator information element Table 10.5.5.34-1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : User Plane integrity indicator information element