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/bts.h | |
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/bts.h')
-rw-r--r-- | src/bts.h | 3 |
1 files changed, 3 insertions, 0 deletions
@@ -142,6 +142,9 @@ struct gprs_rlcmac_bts { uint8_t alpha, gamma; uint32_t dl_tbf_idle_msec; /* hold time for idle DL TBFs */ uint32_t ms_idle_sec; + uint8_t cs_adj_enabled; + uint8_t cs_adj_upper_limit; + uint8_t cs_adj_lower_limit; /* TBF handling, make private or move into TBFController */ /* list of uplink TBFs */ |