EPC中创建默认承载(Default Bearer)中的APN是由谁提供？UE还是网络侧？

chanmao83

解决了我的疑问 多谢斑竹
我在epc的attach req消息中的确没有看到APN。
对于attach的第6步（也就是鉴权成功以后）是 PCO requet
3GPP 23401里面的解释是
Protocol Configuration Options (PCO) are used to transfer parameters between the UE and the PDN GW, and are sent transparently through the MME and the Serving GW. The Protocol Configuration Options may include the Address Allocation Preference indicating that the UE prefers to obtain an IPv4 address only after the default bearer activation by means of DHCPv4. If the UE intends to send PCO which require ciphering (e.g., PAP/CHAP usernames and passwords) or send an APN, or both, the UE shall set the Ciphered Options Transfer Flag and send PCO or APN or both only after authentication and NAS security setup have been completed (see below).