Harald Welte has submitted this change and it was merged. (
https://gerrit.osmocom.org/10459 )
Change subject: trxcon/scheduler: introduce TCH/H TDMA frame mapping helpres
..
trxcon/scheduler: introduce TCH/H TDMA frame mapping helpres
Unlike xCCH, TCH/H channels are using block diagonal interleaving,
so every single burst carries 57 bits of one traffic frame, and 57
bits of another one. Moreover, unlike TCH/F where both traffic
and FACCH/F frames are interleaved over 8 bursts, a FACCH/H is
interleaved over 6 bursts, while a traffic frame is interleaved
over 4 bursts.
This is why a TCH/H burst transmission can't be initiated on
an arbitrary TDMA frame number. It shall be aligned as of
stated in GSM 05.02, clause 7, table 1.
This change introduces two basic functions:
- sched_tchh_block_map_fn - checks if a TCH/H block transmission
can be initiated / finished on a given frame number
and a given channel type;
- sched_tchh_block_dl_first_fn - calculates TDMA frame number of
the first burst using given frame number of the last burst;
and some auxiliary wrappers to simplify the usage of
sched_tchh_block_map_fn().
Change-Id: Iaf4cb33f1b79df23f8a90c8b14ebe0cd9907fbb9
---
M src/host/trxcon/Makefile.am
A src/host/trxcon/sched_lchan_tchh.c
M src/host/trxcon/sched_prim.c
M src/host/trxcon/sched_trx.h
M src/host/trxcon/scheduler.h
5 files changed, 207 insertions(+), 16 deletions(-)
Approvals:
Jenkins Builder: Verified
Harald Welte: Looks good to me, approved
diff --git a/src/host/trxcon/Makefile.am b/src/host/trxcon/Makefile.am
index c9cc170..7095cb5 100644
--- a/src/host/trxcon/Makefile.am
+++ b/src/host/trxcon/Makefile.am
@@ -35,6 +35,7 @@
sched_lchan_desc.c \
sched_lchan_xcch.c \
sched_lchan_tchf.c \
+ sched_lchan_tchh.c \
sched_lchan_rach.c \
sched_lchan_sch.c \
sched_mframe.c \
diff --git a/src/host/trxcon/sched_lchan_tchh.c
b/src/host/trxcon/sched_lchan_tchh.c
new file mode 100644
index 000..316f995
--- /dev/null
+++ b/src/host/trxcon/sched_lchan_tchh.c
@@ -0,0 +1,183 @@
+/*
+ * OsmocomBB <-> SDR connection bridge
+ * TDMA scheduler: handlers for DL / UL bursts on logical channels
+ *
+ * (C) 2018 by Vadim Yanitskiy
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include
+#include
+#include
+
+#include "scheduler.h"
+#include "sched_trx.h"
+
+static const uint8_t tch_h0_traffic_block_map[3][4] = {
+ /* B0(0,2,4,6), B1(4,6,8,10), B2(8,10,0,2) */
+ { 0, 2, 4, 6 },
+ { 4, 6, 8, 10 },
+ { 8, 10, 0, 2 },
+};
+
+static const uint8_t tch_h1_traffic_block_map[3][4] = {
+ /* B0(1,3,5,7), B1(5,7,9,11), B2(9,11,1,3) */
+ { 1, 3, 5, 7 },
+ { 5, 7, 9, 11 },
+ { 9, 11, 1, 3 },
+};
+
+static const uint8_t tch_h0_dl_facch_block_map[3][6] = {
+ /* B0(4,6,8,10,13,15), B1(13,15,17,19,21,23), B2(21,23,0,2,4,6) */
+ { 4, 6, 8, 10, 13, 15 },
+ { 13, 15, 17, 19, 21, 23 },
+ { 21, 23, 0, 2, 4, 6 },
+};
+
+static const uint8_t tch_h0_ul_facch_block_map[3][6] = {
+ /* B0(0,2,4,6,8,10), B1(8,10,13,15,17,19), B2(17,19,21,23,0,2) */
+ { 0, 2, 4, 6, 8, 10 },
+ { 8, 10, 13, 15, 17, 19 },
+ { 17, 19, 21, 23, 0, 2 },
+};
+
+static const uint8_t tch_h1_dl_facch_block_map[3][6] = {
+ /* B0(5,7,9,11,14,16), B1(14,16,18,20,22,24), B2(22,24,1,3,5,7) */
+ { 5, 7, 9, 11, 14, 16 },
+ { 14, 16, 18, 20, 22, 24 },
+ { 22, 24, 1, 3, 5, 7 },
+};
+
+const uint8_t tch_h1_ul_facch_block_map[3][6] = {
+ /* B0(1,3,5,7,9,11), B1(9,11,14,16,18,20), B2(18,20,22,24,1,3) */
+ { 1, 3, 5, 7, 9, 11 },
+ { 9, 11, 14, 16, 18, 20 },
+ { 18, 20, 22, 24, 1, 3 },
+};
+
+/**
+ * Can a TCH/H block transmission be initiated / finished
+ * on a given frame number and a given channel type?
+ *
+ * See GSM 05.02, clause 7, table 1
+ *
+ * @param chan channel type (TRXC_TCHH_0 or TRXC_TCHH_1)
+ * @param fn the current frame number
+ * @param ul Uplink or Downlink?
+ * @param facch FACCH/H or traffic?
+ * @param start init or end of transmission?
+ * @returntrue (yes) or false (no)
+ */
+bool sched_tchh_block_map_fn(enum trx_lchan_type chan,
+
