10 Jul
2013
10 Jul
'13
8:44 p.m.
Hi Harald,
Hi,
On Mon, Jul 08, 2013 at 09:19:23PM +0200, Sipos Csaba
wrote:
> I got a strange error message, that I have to enable RTP Proxy
> mode with "-P" in osmo-nitb.
That's of course funny.
Please take some minutes of your time to look at the
source code line
that generates yoru error message. I'm sure (without looking) that
the message will be printed if bts->model != SIEMENS_BS11. So you
simply need to extend that to include all E1 based bts's.
The part generates this message is the following:
openbsc/openbsc/src/libbsc/bsc_vty.c
#define HANDOVER_STR "Handover Options\n"
DEFUN(cfg_net_handover, cfg_net_handover_cmd,
"handover (0|1)",
HANDOVER_STR
"Don't perform in-call handover\n"
"Perform in-call handover\n")
{
int enable = atoi(argv[0]);
struct gsm_network *gsmnet = gsmnet_from_vty(vty);
if (enable && ipacc_rtp_direct) {
vty_out(vty, "%% Cannot enable handover unless RTP Proxy mode "
"is enabled by using the -P command line option%s",
VTY_NEWLINE);
return CMD_WARNING;
}
gsmnet->handover.active = enable;
return CMD_SUCCESS;
}
After I removed this check, I was able to start OpenBSC with
handover=1, even the OpenBSC VTY said to "show network" that handover
is On, but I was not able to do any handovers even when there was
30-40dB difference (RXlev) between the target and the source cell. The
target was ate -50, the source was around -100, suddenly the phone
jumped to the target cell, but after 3-4 seconds of terrible noise,
both phones are dropped the call. I think it was a cell reselection
not a failed handover, because there was no HO attempts in the
statistics.
> Because these units are running from E1, I just
simply ask: do we have
> handover support for E1 based BTSs?
yes, this was already working with the BS-11 a long
time ago.
If I can help resolve this issue, just let me know what to try.
BR,
Csaba