Section: 9.9.2.7 NAS security parameters to E-UTRA
Content: The purpose of the NAS security parameters to E-UTRA information element is to provide the UE with parameters that enable the UE to create a mapped EPS security context and take this context into use after inter-system handover to S1 mode. The NAS security parameters to E-UTRA information element is coded as shown in figure 9.9.2.7.1 and table 9.9.2.7.1. The NAS security parameters to E-UTRA is a type 3 information element with a length of 7 octets. The value part of the NAS security parameters to E-UTRA information element is included in specific information elements within some RRC messages sent to the UE; see 3GPP TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [22]. For these cases the coding of the information element identifier and length information is defined in 3GPP TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [22]. Figure 9.9.2.7.1: NAS security parameters to E-UTRA information element Table 9.9.2.7.1: NAS security parameters to E-UTRA information element