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Jacob Erlbeck 81ffb740f7 sgsn: Remove inactive LLME/MM after inactivity timeout 
Currently old LLMEs and MM contexts that haven't been explicitly
detached or cancelled are not removed until another request with the
same IMSI is made. These stale entries may accumulate over time and
severely compromise the operation of the SGSN.

This patch implements age based LLME expiry, when the maximum age has
been reached, the corresponding MM context is cancelled. If such an MM
context doesn't exist, the LLME is unassigned directly.

The implementation works as follows.
 - llme->age_timestamp is reset on each received PTP LLC message
 - sgsn_llme_check_cb is invoked periodically (each 30s)
 - sgsn_llme_check_cb sets the age_timestamp to the current time if
   it has been reset
 - sgsn_llme_check_cb computes the age and expires the LLME if
   it exceeds gprs_max_time_to_idle()

Ticket: OW#1364
Sponsored-by: On-Waves ehf

[hfreyther: Fix typo in comment LMME -> LLME]
 		2015-01-26 08:51:50 +01:00
..
contrib systemd: use Wants for the dependency btw. osmo-bsc-mgcp and osmo-bsc 2014-11-11 17:59:49 +01:00
doc sgsn/doc: Add message definitions for PURGE_MS responses 2015-01-18 18:29:47 +01:00
include sgsn: Remove inactive LLME/MM after inactivity timeout 2015-01-26 08:51:50 +01:00
src sgsn: Remove inactive LLME/MM after inactivity timeout 2015-01-26 08:51:50 +01:00
tests sgsn: Remove inactive LLME/MM after inactivity timeout 2015-01-26 08:51:50 +01:00
tools hlrstat: Print numeric MCC/MNC in case no name is available 2010-01-01 15:08:38 +01:00
.gitignore misc: Ignore new binaries 2015-01-02 11:43:06 +01:00
AUTHORS add sylvain and andreas as authors 2010-01-10 18:21:33 +01:00
COPYING License change: We are now AGPLv3+ instead of GPLv2+ 2011-01-01 15:39:34 +01:00
Makefile.am Introduced support for external python tests 2013-06-24 13:22:34 +02:00
README update README with URL of the homepage 2010-05-04 08:10:18 +02:00
configure.ac meas: Unbreak the build once more 2015-01-10 09:54:30 +01:00
git-version-gen automatically include program version and print it from vty and --version 2010-03-23 00:09:32 +08:00
openbsc.pc.in Install gsm_04_08.h and required headers into a openbsc/ 2010-02-16 17:51:42 +01:00
osmoappdesc.py hsl: Remove the support for the HSL bts from OpenBSC 2013-07-03 16:19:41 +02:00

README 

About OpenBSC
=============

OpenBSC is a minimalistic implementation of the GSM Network, with
particular emphasis on the functionality typically provided by the BSC,
MSC, HLR, VLR and SMSC.

Its currently supported interfaces towards the BTS are:

 * Classic A-bis over E1 using a mISDN based E1 interface. In other
   words, you can connect existing GSM Base Transceiver Station (BTS)
   through E1 to OpenBSC.  So far, we have only tested the Siemens BS-11
   Test reports with other BTS are much appreciated!

 * A-bis over IP as used by the ip.access nanoBTS product family

You can find the project documentation at http://openbsc.gnumonks.org/

This project is still in its early days, and there are lots of areas where it
doesn't behave as per GSM spec.

	Harald Welte <laforge@gnumonks.org>


libosmocore
===========

Please note that as of March 2010, OpenBSC has a dependency to a library
called "libosmocore".  You can obtain that library from

	git://git.osmocom.org/libosmocore.git