diff --git a/include/osmo-bts/scheduler.h b/include/osmo-bts/scheduler.h
index a7bc6c728..f5f346e82 100644
--- a/include/osmo-bts/scheduler.h
+++ b/include/osmo-bts/scheduler.h
@@ -71,6 +71,11 @@ enum trx_burst_type {
 
 /* States each channel on a multiframe */
 struct l1sched_chan_state {
+	/* Pointer to the associated logical channel state from gsm_data_shared.
+	 * Initialized during channel activation, thus may be NULL for inactive
+	 * or auto-active channels. Always check before dereferencing! */
+	struct gsm_lchan	*lchan;
+
 	/* scheduler */
 	bool			active;		/* Channel is active */
 	ubit_t			*dl_bursts;	/* burst buffer for TX */
diff --git a/src/common/scheduler.c b/src/common/scheduler.c
index ed6c62322..b79c83db5 100644
--- a/src/common/scheduler.c
+++ b/src/common/scheduler.c
@@ -1000,6 +1000,11 @@ int trx_sched_set_lchan(struct l1sched_trx *l1t, uint8_t chan_nr, uint8_t link_i
 			else
 				chan_state->ho_rach_detect = 0;
 			chan_state->active = active;
+
+			if (active) {
+				chan_state->lchan = get_lchan_by_chan_nr(l1t->trx, chan_nr);
+				OSMO_ASSERT(chan_state->lchan != NULL);
+			}
 		}
 	}
 
diff --git a/src/osmo-bts-trx/sched_lchan_tchf.c b/src/osmo-bts-trx/sched_lchan_tchf.c
index 80115a9c2..d28962034 100644
--- a/src/osmo-bts-trx/sched_lchan_tchf.c
+++ b/src/osmo-bts-trx/sched_lchan_tchf.c
@@ -50,6 +50,7 @@ int rx_tchf_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 {
 	struct l1sched_ts *l1ts = l1sched_trx_get_ts(l1t, bi->tn);
 	struct l1sched_chan_state *chan_state = &l1ts->chan_state[chan];
+	struct gsm_lchan *lchan = chan_state->lchan;
 	sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
 	uint8_t *mask = &chan_state->ul_mask;
 	uint8_t rsl_cmode = chan_state->rsl_cmode;
@@ -59,8 +60,6 @@ int rx_tchf_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 	int n_errors = 0;
 	int n_bits_total = 0;
 	bool bfi_flag = false;
-	struct gsm_lchan *lchan =
-		get_lchan_by_chan_nr(l1t->trx, trx_chan_desc[chan].chan_nr | bi->tn);
 	unsigned int fn_begin;
 	uint16_t ber10k;
 	uint8_t is_sub = 0;
diff --git a/src/osmo-bts-trx/sched_lchan_tchh.c b/src/osmo-bts-trx/sched_lchan_tchh.c
index 8adaec357..0281342c3 100644
--- a/src/osmo-bts-trx/sched_lchan_tchh.c
+++ b/src/osmo-bts-trx/sched_lchan_tchh.c
@@ -50,6 +50,7 @@ int rx_tchh_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 {
 	struct l1sched_ts *l1ts = l1sched_trx_get_ts(l1t, bi->tn);
 	struct l1sched_chan_state *chan_state = &l1ts->chan_state[chan];
+	struct gsm_lchan *lchan = chan_state->lchan;
 	sbit_t *burst, **bursts_p = &chan_state->ul_bursts;
 	uint8_t *mask = &chan_state->ul_mask;
 	uint8_t rsl_cmode = chan_state->rsl_cmode;
@@ -59,8 +60,6 @@ int rx_tchh_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 	int n_errors = 0;
 	int n_bits_total = 0;
 	bool bfi_flag = false;
-	struct gsm_lchan *lchan =
-		get_lchan_by_chan_nr(l1t->trx, trx_chan_desc[chan].chan_nr | bi->tn);
 	/* Note on FN-10: If we are at FN 10, we decoded an even aligned
 	 * TCH/FACCH frame, because our burst buffer carries 6 bursts.
 	 * Even FN ending at: 10,11,19,20,2,3