Instead of handling numerical MCC and MNC, they are now stored and handled
hexadecimal, like they are received by the network. This makes it possible
to correctly handle 2 and 3 digits MNC. Internally 2 digit MNCs are stored
as 0xXXf, and 3 digits MNC are stored as 0xXXX, where X is the digit 0..9.
The length of MNC in the IMSI (2 or 3 digits) depend on the MNC length
trying to match. Anyway that MNC name can be printed even without knowing the
actual length. This is done by matching the IMSI against list of networks.
PLEASE REMOVE "/etc/osmocom/*.ba", because the MCC and MNC stored there is
not valid anymore.
Pressing CTRL+c causes the detach process to run, then the mobile exits.
This procedure only runs after attachment (location update) and if detach
is required.
The SABM with the detach message is confirmed by a DISC message. the BS11
says that this is caused by sequence error or N200+1 error. Maybe someone
can trace that.
While testing, you may find out that making an emergency call is rejected
with cause 5 (illegal ME), because emergency facilities in some countries
like to reject calls without knowing the subscriber.
An emergency IMSI can be defined via VTY, so it is possible to make calls
with that IMSI, even without the SIM, because authentication is not
applicable during emergency call establishment.
All the information above, I received from the freely available 3GPP TS 04.08.
See NOTE at sub clause 4.5.1.5.
Now location update reject works. The rejected network/cell is stored in
an appropriate list. The lists can be dumped from the VTY.
A fake authentication response is generated until the SIM interface is
available. If the network rejects the test SIM, due to authentication
failure, it is removed and limited service state is entered. This currenlty
works on networks with SDCCH on the TS0 only.
In case of registration not possible / requried, the appropriate result
message (REG_FAILED / REG_SUCCESS) must be returned to PLMN process.
Location updating message fix.
The location update is now performed after the channel is assigned.
In dedicated mode the network receives the LOCATION UPDATING REQUEST.
The reply (IDENTITY REQUEST and LOCATION UPDATING REJECT) is received.
But subsequent message like the IDENTITY RESPONSE is not transmitted
by lapdm.c.
It is now possible to show informations about:
- mobile
- subscriber
- received cell informations
Later it can be used to do configurations (phone's menu)
and trigger events, like dialing a phone number.
- Fixes on PLMN search and cell selection process.
- Fixes on radio ressource.
- ^C will cause IMSI detach when pressed the first time.
Pressing ^C again will cause termination of process at any time.
The current code will scan frequencies, select a cell and camps on it.
No SIM is inserted. Paging requests and Immediate assginments can be seen.
When inserting a SIM card (uncomment it in app_mobile.c), location update
is triggered after selecting a cell. The RACH request is sent, an
Immediate assignment is received, the dedicated mode is requested.
Nothing happens then, because no confirm / abort of layer 2 is received.
This is the current status of the layer 3 protocols. Everything compiles,
radio ressource layer is partly complete. Everything is untested, so don't
expect that it runs and does something usefull. The next step for me is
running and debugging it.
Here is the list of files that are added / modified:
new file: ../include/osmocom/gsm322.h
new file: ../include/osmocom/gsm48_cc.h
new file: ../include/osmocom/gsm48_mm.h
new file: ../include/osmocom/gsm48_rr.h
modified: ../include/osmocom/l23_app.h
modified: ../include/osmocom/logging.h
new file: ../include/osmocom/mncc.h
modified: ../include/osmocom/osmocom_data.h
new file: ../include/osmocom/subscriber.h
new file: ../include/osmocom/support.h
new file: ../include/osmocom/sysinfo.h
new file: ../include/osmocom/transaction.h
modified: Makefile.am
new file: app_mobile.c
new file: gsm322.c
new file: gsm48_cc.c
new file: gsm48_mm.c
new file: gsm48_rr.c
modified: main.c
new file: mnccms.c
new file: subscriber.c
new file: support.c
new file: sysinfo.c
new file: transaction.c
Andreas.Eversberg