In addition to logging the current values of a BTS's channel load
average and T3122 override, maintain stat items for these values.
This allows for plotting these values over time, for instance.
These values show up in the VTY under 'show stats' like this:
base transceiver station:
Channel load average.: 25 %
T3122 IMMEDIATE ASSIGNMENT REJECT wait indicator.: 32 s
Change-Id: Icace0176e8b1d23d7c7b4816f7c67c65312844fa
Suggested-by: laforge
The IMMEDIATE ASSIGN REJECT message contains a wait indicator which
tells an MS requesting a channel to wait for a specified amount of
time before trying to request a channel again, i.e. the wait indicator
controls the T3122 timeout value in the MS.
Previously, the wait indicator was fixed to 10 seconds.
This is not sufficient if there are a lot of MS requesting channels
because the MS will retry too soon. Instead of using a fixed value,
maintain a dynamic wait indicator value based on average channel load.
The load (used vs. available channels on a BTS) is sampled once per
second, and once 8 samples have been collected we update a BTS-specific
T3122 wait indicator based on the measured load.
While the wait indicator could go up to 255 seconds, this initial
implementation keeps it in the range from 10 to 128 seconds.
Further experimentation and testing will show whether higher wait
indicator values are desirable, if the sampling rate needs to change,
or if the function mapping the load measurement to a wait indicator
value should change (currently we map the load average linearly into
the range [10, 128] inclusive).
Change-Id: I57e38f6d6ba3b23cc6e1f9520b90261dbb1f1cec
Related: OS#2592
This is needed for handover algorithm to balance free slots and to prevent
congestion of one cell, while other cells still have free capacities.
Change-Id: Ic8bee8a515ee8aa9a99af71756fe60b8dd8f868b
get_meas_rep_avg will return -EINVAL, if the required number of
measurements are not reached. There will be no handover possible until the
given number of measurements are available.
Change-Id: Ibc4410b4e162cdb6c070128d2c63946bb79d6d65
There still is a lot of dead code that we inherited from the NITB
days, let's remove more of it.
libtrau will be re-introduced as part of osmo-mgw later.
Change-Id: I8e0af56a158f25a4f1384d667c03eb20e72df5b8
* change return type to bool
* constify parameters
The nm_is_running(), trx_is_usable() and ts_is_usable() always return
boolean value and are always used as such anyway. The also do not change
their parameters.
Change-Id: I6a572fc78371c69f5308edbad0ebe15e143d0505
Previously we've used function so debug print always pointed to the same
place which is not very useful. Wrap it with macro so proper
file:line is printed. Also, make sure that we always change state only
through this wrapper and log only when the state has changed.
Change-Id: I21789f8021290965b61a54a2b23177ccbbfe8321
This is the first step in creating this repository from the legacy openbsc.git.
Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.
Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7
Stefan Sperling
Harald Welte