trxcon/scheduler: refactor Downlink measurement processing

So far we used to store the sums of ToA and RSSI measurements in the
logical channel state, and after decoding of a block, we did calculate
the average. This approach works fine for xCCH and PDTCH, but when it
comes to block-diagonal interleaving (which is used on TCH/F and TCH/H
channels), the results are incorrect. The problem is that a burst on
TCH may carry 57 bits of one encoded frame and 57 bits of another.

Instead of calculating the sum of measurements on the fly, let's push
them into a circular buffer (the measurement history), and keep them
there even after decoding of a block. This would allow us to calculate
the average of N last measurements depending on the interleaving type.

A single circular buffer can hold up to 8 unique measurements, so the
recent measurements would basically override the oldest ones.

Change-Id: I211ee3314f0a284112a4deddc0e93028f4a27cef

1 files changed, 5 insertions, 5 deletions

diff --git a/src/host/trxcon/sched_lchan_desc.c b/src/host/trxcon/sched_lchan_desc.c
index b22a18b8..1184e5be 100644
--- a/src/host/trxcon/sched_lchan_desc.c
+++ b/src/host/trxcon/sched_lchan_desc.c
@@ -31,35 +31,35 @@
 /* Forward declaration of handlers */
 int rx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
-	sbit_t *bits, int8_t rssi, int16_t toa256);
+	sbit_t *bits, const struct trx_meas_set *meas);
 
 int tx_data_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
 
 int rx_sch_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
-	sbit_t *bits, int8_t rssi, int16_t toa256);
+	sbit_t *bits, const struct trx_meas_set *meas);
 
 int tx_rach_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
 
 int rx_tchf_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
-	sbit_t *bits, int8_t rssi, int16_t toa256);
+	sbit_t *bits, const struct trx_meas_set *meas);
 
 int tx_tchf_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
 
 int rx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
-	sbit_t *bits, int8_t rssi, int16_t toa256);
+	sbit_t *bits, const struct trx_meas_set *meas);
 
 int tx_tchh_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);
 
 int rx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid,
-	sbit_t *bits, int8_t rssi, int16_t toa256);
+	sbit_t *bits, const struct trx_meas_set *meas);
 
 int tx_pdtch_fn(struct trx_instance *trx, struct trx_ts *ts,
 	struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid);