LTE PDN type

[raj.marylandcp]

I am trying to understand reasons for LTE Attach Failure due to Cause #51 – PDN type IPv6 only allowed : This ESM cause is used by the network to indicate that only PDN type IPv6 is allowed for the requested PDN connectivity.

Q: On What basis is the PDN type selected during the Attach procedure.

Any help will be appreciated.

[V250]

Hi,

Please check configuration done at EPC (particularly at PGW). Configuration done only for IPv6 or both IPv4 & IPv6, this could be reason for this error cause. Also check the capability of the UE (used for Attach).. is UE supports both IPv4 & IPv6 or only IPv6?

Regards,
V250


I am trying to understand reasons for LTE Attach Failure due to Cause #51 – PDN type IPv6 only allowed : This ESM cause is used by the network to indicate that only PDN type IPv6 is allowed for the requested PDN connectivity.

Q: On What basis is the PDN type selected during the Attach procedure.

Any help will be appreciated.

[raj.marylandcp]

The way that the UE sets the requested PDN type may be pre-configured in the device per APN. Unless otherwise configured (including when the UE does not send any APN), the UE sets the PDN type during the Attach or PDN Connectivity procedures based on its IP stack configuration as follows:
- A UE which is IPv6 and IPv4 capable shall request for PDN type IPv4v6.
- A UE which is only IPv4 capable shall request for PDN type IPv4.
- A UE which is only IPv6 capable shall request for PDN type IPv6.
- When the IP version capability of the UE is unknown in the UE (as in the case when the MT and TE are separated and the capability of the TE is not known in the MT), the UE shall request for PDN type IPv4v6.

----3GPP TS 23.401 (http://www.3gpp.org/ftp/Specs/archive/23_series/23.401)