diff options
| author | Vadim Yanitskiy <axilirator@gmail.com> | 2019-07-07 19:58:48 +0700 |
|---|---|---|
| committer | laforge <laforge@gnumonks.org> | 2019-07-21 13:51:57 +0000 |
| commit | 9649a42d5a3c24a21c14bb9f54e7c34a398da7b1 (patch) | |
| tree | 66363546279249833a49769a609a7989a4e9358f /include | |
| parent | db6c7863506ea3685d73df26c45723073ee1f109 (diff) | |
Clarify and refactor link quality (C/I) handling
The radio link quality is defined by C/I (Carrier-to-Interference
ratio), which is computed from the training sequence of each
received burst, by comparing the "ideal" training sequence with
the actual (received) one.
Link quality measurements are used by L1SAP to filter out "ghost"
Access Bursts, and by the link quality adaptation algorithms. One
can define minimum link quality values using the VTY interface.
On the VTY interface we expect integer C/I values in centiBels
(cB, 10e-2 B), while the internal structures are using float
values in deciBels (dB, 10e-1 B). Some PHYs (sysmo, octphy,
oc2g, and litecell15) expose C/I measurements in deciBels,
while on the L1SAP interface we finally send then in centiBels.
Let's avoid this confusion and stick to a single format, that
will be used by the internal logic of OsmoBTS - integer values
(int16_t) in centiBels. This will give us the range of:
-32768 .. 32767 centiBels, or
-3276.8 .. 3276.7 deciBels,
which is certainly sufficient.
Change-Id: If624d6fdc0270e6813af8700d95f1345903c8a01
Diffstat (limited to 'include')
| -rw-r--r-- | include/osmo-bts/gsm_data_shared.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/osmo-bts/gsm_data_shared.h b/include/osmo-bts/gsm_data_shared.h index a4e326ac..dd2a14c0 100644 --- a/include/osmo-bts/gsm_data_shared.h +++ b/include/osmo-bts/gsm_data_shared.h @@ -759,8 +759,8 @@ struct gsm_bts { int smscb_queue_max_len; /* maximum queue length */ int smscb_queue_hyst; /* hysteresis for CBCH laod indications */ - float min_qual_rach; /* minimum quality for RACH bursts */ - float min_qual_norm; /* minimum quality for normal daata */ + int16_t min_qual_rach; /* minimum link quality (in centiBels) for Access Bursts */ + int16_t min_qual_norm; /* minimum link quality (in centiBels) for Normal Bursts */ uint16_t max_ber10k_rach; /* Maximum permitted RACH BER in 0.01% */ struct { |