GSM/GPRS/EDGE Access Stratum (GAS). The protocol stack is based on a dual mode stack (2G and 3G) which easily can be configure single or dual mode during compile time, without any additional code overhead. The Non-Access Stratum (NAS) contains the

this 3GPP 24301-d00.zip, the latest ziliao. very good .-3rd Generation Partnership Project Technical Specification Group Core Network and Terminals Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)

本文档介绍了EPS 系统的安全架构、EPS 系统的安全特征、用户与网络间的安全、UE 与EPC 核心网络间安全流程、UE 与EPS 接入网络间安全流程、NAS 信令的安全机制、E-UTRAN 与 UTRAN 间互操作安全、E-UTRAN 与GERAN 间的安全互通、从 E-UTRAN 到 UTRAN/GERAN 电路域的 SRVCC、紧急呼叫过程中的安全问题、密钥推导函数和加密及完整性保护算法。-3GPP System Architecture Evolution (SAE) Se