diff options
| -rw-r--r-- | openbsc/doc/sgsn-remote-protocol.txt | 77 |
1 files changed, 67 insertions, 10 deletions
diff --git a/openbsc/doc/sgsn-remote-protocol.txt b/openbsc/doc/sgsn-remote-protocol.txt index 3369d19b1..be3001b63 100644 --- a/openbsc/doc/sgsn-remote-protocol.txt +++ b/openbsc/doc/sgsn-remote-protocol.txt @@ -67,6 +67,20 @@ shall be sent in the given order. Nevertheless after the generic part the receiver shall be able to received them in any order. Unknown IE shall be ignored. +3.1.1. Error Messages + + IEI Info Element Type Pres. Format Length + Message type 4.2.1 M V 1 + 01 IMSI 4.2.9 M TLV 2-10 + 02 Cause 4.2.10 C TLV 3 + +The Cause information element shall be used, if the corresponding MAP response +contains a User Error. The mapping is defined in 4.2.10. If the Cause IE is not +included, the receiver shall assume the cause 'Network failure'. + +[TODO: decide whether to add an IE for a textual description of the error that +can be used in log messages] + 3.2.1. Send Authentication Info Request SGSN -> Network peer @@ -82,8 +96,7 @@ Network peer -> SGSN IEI Info Element Type Pres. Format Length Message type 4.2.1 M V 1 01 IMSI 4.2.9 M TLV 2-10 - 02 Cause GMM cause, M TLV 3 - 04.08: 10.5.5.14 + 02 Cause 4.2.10 C TLV 3 3.2.3. Send Authentication Info Response @@ -109,8 +122,7 @@ Network peer -> SGSN IEI Info Element Type Pres. Format Length Message type 4.2.1 M V 1 01 IMSI 4.2.9 M TLV 2-10 - 02 Cause GMM cause, M TLV 3 - 04.08: 10.5.5.14 + 02 Cause 4.2.10 C TLV 3 3.2.6. Update Location Result @@ -156,8 +168,7 @@ Network peer -> SGSN IEI Info Element Type Pres. Format Length Message type 4.2.1 M V 1 01 IMSI 4.2.9 M TLV 2-10 - 02 Cause GMM cause, M TLV 3 - 04.08: 10.5.5.14 + 02 Cause 4.2.10 C TLV 3 3.2.11. Purge MS Result @@ -187,8 +198,7 @@ SGSN -> Network peer IEI Info Element Type Pres. Format Length Message type 4.2.1 M V 1 01 IMSI 4.2.9 M TLV 2-10 - 02 Cause GMM cause, M TLV 3 - 04.08: 10.5.5.14 + 02 Cause 4.2.10 C TLV 3 3.2.14. Insert Subscriber Data Result @@ -215,8 +225,7 @@ SGSN -> Network peer IEI Info Element Type Pres. Format Length Message type 4.2.1 M V 1 01 IMSI 4.2.9 M TLV 2-10 - 02 Cause GMM cause, M TLV 3 - 04.08: 10.5.5.14 + 02 Cause 4.2.10 C TLV 3 3.2.17. Delete Subscriber Data Result @@ -397,3 +406,51 @@ The IMSI is encoded like in octet 4-N of the Called Party BCD Number defined in Note 1) Either '1 1 1 1 | Number digit N' (N odd) or 'Number digit N | Number digit N-1' (N even), where N is the number of digits. + +4.2.10. Cause + +Cause are encoded as GMM cause values (see GSM 04.08, 10.5.5.14). If the cause +IE is missing in an ERROR message, 'network failure' is assumed. + + 8 7 6 5 4 3 2 1 + +-----------------------------------------------------+ + | | Cause IEI | octet 1 + +-----------------------------------------------------+ + | Length of Cause IE contents (1) | octet 2 + +-----------------------------------------------------+ + | Cause value | octet 3 + +-----------------------------------------------------+ + +The MAP User Errors (see GSM 09.02, 7.6.1.4) are mapped as follows: + + +-----------------------------------------------------------+ + | MAP User Error GMM Cause | + | | + | system failure NET_FAIL | + | data missing COND_IE_ERR (?) | + | unexpected data value SEM_INCORR_MSG (?) | + | resource limitation NET_FAIL | + | initiating release MSGT_INCOMP_P_STATE | + | facility not supported MSGT_NOTEXIST_NOTIMPL (?) | + | incompatible terminal MSGT_NOTEXIST_NOTIMPL (?) | + | | + | unknown subscriber IMSI_UNKNOWN | + | number changed IMSI_UNKNOWN | + | unknown MSC (?) | + | unidentified subscriber IMSI_UNKNOWN | + | unallocated roaming number IMSI_UNKNOWN (?) | + | unknown equipment ILLEGAL_ME (?) | + | unknown location area LA_NOTALLOWED (?) | + | | + | roaming not allowed ROAMING_NOTALLOWED | + | illegal subscriber ILLEGAL_MS | + | bearer service not provisioned (?) | + | teleservice not provisioned (?) | + | illegal equipment ILLEGAL_ME | + +-----------------------------------------------------------+ + +[TODO: Finish the mapping table] + +In addition, the causes mentioned in GSM 04.08, G.3 and G.5, can be used for +errors that are related to the decoding of messages defined by this +specification or to the MAP connection to the HLR. |