76 lines
2.7 KiB
Plaintext
76 lines
2.7 KiB
Plaintext
== Building the cellmgr_ng ==
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=== Requirements ===
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==== OpenBSC ====
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The result of "make install" of OpenBSC is required. The cellmgr_ng is using
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the osmocomm and sccp library provided by OpenBSC.
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==== NexusWare C7 =====
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The NexusWare C7 library must be available. It is used to communicate with
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MTP up to Level3.
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==== NexusWare Uniporte ====
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The NexusWare Uniported library must be available. It is used to handle
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the configuration of the MGW.
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=== Configuring & Building ===
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The cellmgr_ng is using autoconf. At first the configure script must be
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generated, after this ./configure can be called. The configure script will
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use pkg-config to find the CFLAGS and LIBS for the Osmocomm, SCCP, NexusWare
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C7 and NexusWare Uniporte libraries.
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The NexusWare libraries naturally do not come with pkg-config files. There
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are two example files in the pkg-config directory of the cellmgr_ng that can
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be changed to point to the proper paths. Alternatively the NEXUSWARE_C7_CFLAGS,
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NEXUSWARE_C7_LIBS, NEXUSWARE_UNIPORTE_CFLAGS, NEXUSWARE_UNIPORTE_LIBS environment
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variables can be set instead.
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$ autoreconf --install --force
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$ export PKG_CONFIG_PATH=/openbsc/install/lib/pkg-config:$PWD/pkgconfig
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$ . /stuff/NexusWare/SETUP.SH
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$ ./configure --host=ppc-linux
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$ make
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== Reset handling ==
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=== Loss of the TCP connection to the MSC ===
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* All open SCCP connections need to be closed
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* All circuits allocated for voice calls need to be closed
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* On reconnect the cellmgr needs to generate the reset messages
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* The SCCP link is considered to be up
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=== Loss of the MTP link/SLTM timeouts ===
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* We will have to generate a SCCP reset to the network
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* We will have to close ever voice call/mgcp and such
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== Filtering ==
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=== Filtering reset acks ===
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For the above reset handling we filter the reset on both sides. Whenever
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we connect to the MSC or lose the BSC we send it a reset.
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Whenever the BSC is sending us a reset we directly respond with a reset act
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=== Filtering RLSD messages ===
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We are using the RLSD from the network and immediately reply with a RLC
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if we don't know about this combination of src and dest reference. If we
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do have a pair we set a flag and will send a RLC when we receive a RLC from
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the BSC.
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If we receive a RLSD from the BSC we do have a bug as we didn't respond
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within a short enough timeout. We will close the connection. At which point
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we will handle the above.
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The reason to handle RLSD is that the BSC has a rather short timeout from
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cleanup complete to wanting a RLSD and then the MSC and BSC will have some
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issues...
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== Header Rewriting ==
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=== POI ===
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We do not want to have the point code indicator in the SCCP header. Currently
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we are removing this from the CR and DT1 messages.
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