diff options
| author | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-06-04 12:12:32 +0200 |
|---|---|---|
| committer | Jacob Erlbeck <jerlbeck@sysmocom.de> | 2015-06-08 09:40:09 +0200 |
| commit | 1751c62c980f8d6ed965e08fcb9ad1af485d8854 (patch) | |
| tree | 80b46ca4327c0902778eb3fd62e4c751af866f98 /src/pcu_main.cpp | |
| parent | f47f68a9d8e4421398e2369e4b18de8c52a9d396 (diff) | |
tbf: Add adaptive DL CS adjustment
To cope with transmission failures due to bad radio conditions, a
different coding scheme with more redundance can be used.
This commit adds an implemenation that is based on the Ack/Nack
ratio per PACKET DOWNLINK ACK/NACK message received from the MS.
Basically the CS level is decreased, if the block error rate goes
above cs_adj_upper_limit (default 33%), and it is increased, if the
rate drops below cs_adj_lower_limit (default 10%). Only blocks that
have been encoded with the current CS are taken into account.
Note that this approach doesn't measure the MS->BTS conditions and
that the measurement values reported by the MS are not taken into
account.
Ticket: #1739
Sponsored-by: On-Waves ehf
Diffstat (limited to 'src/pcu_main.cpp')
| -rw-r--r-- | src/pcu_main.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/pcu_main.cpp b/src/pcu_main.cpp index 9e96af08..2e4a970f 100644 --- a/src/pcu_main.cpp +++ b/src/pcu_main.cpp @@ -173,6 +173,9 @@ int main(int argc, char *argv[]) bts->n3105 = 8; bts->alpha = 0; /* a = 0.0 */ bts->ms_idle_sec = 60; /* slightly above T3314 (default 44s, 24.008, 11.2.2) */ + bts->cs_adj_enabled = 1; + bts->cs_adj_upper_limit = 33; /* Decrease CS if the error rate is above */ + bts->cs_adj_lower_limit = 10; /* Increase CS if the error rate is below */ msgb_set_talloc_ctx(tall_pcu_ctx); |