Feature Description
cnSGW-C supports RAN/NAS cause codes as defined in 3GPP TS 29.274, version 15.4.0, section 8.103, RAN/NAS Cause.
cnSGW-C transparently transmits the RAN/NAS Release Cause IE provided by the MME to the PGW for further propagation towards the PCRF.
Note | GTP-based S5/S8 and S11 are supported. |
The following table lists the RAN/NAS Cause codes.
Octets |
Bits |
|||||||
---|---|---|---|---|---|---|---|---|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
|
1 |
Type = 172 (decimal) |
|||||||
2–3 |
Length = n |
|||||||
4 |
Spare |
Instance |
||||||
5 |
Protocol Type |
Cause Type |
||||||
6 to m |
Cause Value |
|||||||
(m+1) to (n+4) |
One or more octets from these octets are present, only if explicitly specified |
The Protocol Type field is encoded with the specified values for the RAN/NAS Cause as follows:
Protocol Type |
Values (Decimal) |
---|---|
S1AP Cause |
1 |
EMM Cause |
2 |
ESM Cause |
3 |
<spare> |
4–15 |
The Cause Value field (and the associated RAN cause subcategory) is transferred over the S1-AP interface. The field is encoded in one octet as a binary integer.
Cause Type |
Values (Decimal) |
---|---|
Radio Network Layer |
0 |
Transport Layer |
1 |
NAS |
2 |
Protocol |
3 |
Miscellaneous |
4 |
<spare> |
5–15 |
For EMM and ESM Causes, the Cause Value field contains the cause value as specified in 3GPP TS 24.301. If the Protocol is S1AP, the cause value contains the specified value as in 3GPP TS 36.413.