The PDN connectivity procedure is used by the UE to request the setup of a default EPS bearer to a PDN.
The UE requests connectivity to a PDN by sending a PDN CONNECTIVITY REQUEST message to the network. If this request is accepted by the network, then it initiates the establishment of a default EPS bearer context activation procedure.
This procedure is used either to establish the first default bearer (PDN CONNECTIVITY REQUEST is sent along with initial attach message), or to establish subsequent default bearers to additional PDNs (a stand-alone PDN CONNECTIVITY REQUEST is sent by the UE).
If the UE is in EMM-IDLE mode, the Service Request procedure is performed before the PDN Connectivity procedure can be initiated.
If there is already a PDN connection for emergency bearer services established, the UE shall not request an additional PDN connection for emergency bearer services.
A UE attached for emergency bearer services shall not request a PDN connection to any other PDN.
When the PDN CONNECTIVITY REQUEST message is sent together with an ATTACH REQUEST message, the UE shall not include the APN.
When requesting connectivity to an additional PDN, the UE shall include the requested APN (in the stand-alone PDN CONNECTIVITY REQUEST) except for emergency bearer services
The UE may set the ESM information transfer flag in the PDN CONNECTIVITY REQUEST message to indicate that it has ESM information, i.e. protocol configuration options, or APN, or both, that needs to be transferred to the MME after the NAS signalling security has been activated.
If the ESM information transfer flag is set in PDN CONNECTIVITY REQUEST message, the MME initiates (after NAS sigalling security is activated) the ESM information request procedure in which the UE can provide the MME with protocol configuration options or APN or both.
If the UE wishes to connect to a PDN using default APN, it need not include the APN in the Access Point Name IE in the ESM INFORMATION RESPONSE or PDN CONNECTIVITY REQUEST (stand-alone) message. The only exceptional case is, if the connectivity to a PDN using the default APN requires PAP/CHAP, then the UE should include the APN in the Access point name IE.
The UE shall set the Request Type IE to "initial request" when the UE is establishing a new PDN connectivity to a PDN in an attach procedure or in a stand-alone PDN connectivity procedure.
The UE shall set the Request Type IE to "emergency" when the UE is requesting a new PDN connectivity for emergency bearer services.
The Request Type IE is set to "handover" when the connectivity to a PDN is established upon handover from a non-3GPP access network and the UE was connected to that PDN before the handover to the 3GPP access network
The other IEs in the PDN CONNECTIVITY REQUEST message include EPS Bearer Identity, Procedure Transaction Identity, PDN Type, and Device Properties etc…
If the UE includes ESM information transfer flag in the PDN CONNECTIVITY REQUEST message, the MME waits for completion of the ESM information request procedure before proceeding with the PDN connectivity procedure. The MME then checks if connectivity with the requested PDN can be established.
If requested APN is not included in the PDN CONNECTIVITY REQUEST or the ESM INFORMATION RESPONSE message and the request type is different from "emergency", the MME shall use the default APN as the requested APN. If the request type is "emergency", the MME shall use the APN configured for emergency bearer services
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