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LTE基础:NAS基本流程与NAS层功能和基本流程的映射关系
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NAS基本流程
NAS基本流程如下表所示。
| 基本流程 | 初始消息 | 应答消息 | |
| 成功 | 未成功 | ||
| Authentication procedure | AUTHENTICATION REQUEST | AUTHENTICATION RESPONSE | AUTHENTICATION REJECT |
| Attach procedure for EPS services | ATTACH REQUEST | ATTACH ACCEPT | ATTACH REJECT |
| Detach procedure | DETACH REQUEST | DETACH ACCEPT | |
| Paging procedure | REQUEST PAGING | SERVICE REQUEST（TMSI） ATTACH（IMSI） EXTENDED SERVICE REQUEST（CS fallback to A/Gb or Iu mode） | |
NAS层功能和基本流程的映射关系
NAS层功能和基本流程的映射关系如下表所示。
| EPS mobility management | EPS session management |
| Authentication procedure | Principles of address handling for ESM procedures |
| Security mode control procedure | Default EPS bearer context activation procedure |
| Identification procedure | Dedicated EPS bearer context activation procedure |
| EMM information procedure | EPS bearer context modification procedure |
| Attach procedure for EPS services | EPS bearer context deactivation procedure |
| Detach procedure | UE requested PDN connectivity procedure |
| Tracking area updating procedure | UE requested PDN disconnect procedure |
| Service request procedure | UE requested bearer resource allocation procedure |
| Paging procedure | UE requested bearer resource modification procedure |
| Transport of NAS messages procedure | ESM information request procedure |
