Section: 9.9.3.19 KSI and sequence number
Content: The purpose of the KSI and sequence number information element is to provide the network with the key set identifier (KSI) value of the current EPS security context and the 5 least significant bits of the NAS COUNT value applicable for the message including this information element. The KSI and sequence number information element is coded as shown in figure 9.9.3.19.1 and table 9.9.3.19.1. The KSI and sequence number is a type 3 information element with a length of 2 octets. Figure 9.9.3.19.1: KSI and sequence number information element Table 9.9.3.19.1: KSI and sequence number information element