[PATCH] osmo-bts[master]: 11bit RACH support for osmo-bts-litecell15

[bhargava_abhyankar]

Review at  https://gerrit.osmocom.org/1168

11bit RACH support for osmo-bts-litecell15

Based on the indication from L1, number of bits in RACH and burst
type is determined. Appropriate parameters are filled in
osmo-bts-litecell15. These parameters are sent to osmo-pcu for
processing of the RACH.

Change-Id: Ie5207a15424fb287febf74e830297531232accde
---
M src/osmo-bts-litecell15/l1_if.c
1 file changed, 40 insertions(+), 3 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/68/1168/1

diff --git a/src/osmo-bts-litecell15/l1_if.c b/src/osmo-bts-litecell15/l1_if.c
index f47634e..edc5f5b 100644
--- a/src/osmo-bts-litecell15/l1_if.c
+++ b/src/osmo-bts-litecell15/l1_if.c
@@ -945,7 +945,8 @@
 	struct gsm_lchan *lchan;
 	struct osmo_phsap_prim *l1sap;
 	uint32_t fn;
-	uint8_t ra, acc_delay = 0;
+	uint8_t acc_delay = 0;
+	uint16_t ra = 0, is_11bit = 0, burst_type = 0, temp = 0;
 	int rc;
 
 	/* increment number of busy RACH slots, if required */
@@ -967,16 +968,29 @@
 		btsb->load.rach.access++;
 
 	dump_meas_res(LOGL_DEBUG, &ra_ind->measParam);
+	burst_type = ra_ind->burstType;
 
-	if (ra_ind->msgUnitParam.u8Size != 1) {
+	if ((ra_ind->msgUnitParam.u8Size != 1) &&
+		(ra_ind->msgUnitParam.u8Size != 2)) {
 		LOGP(DL1C, LOGL_ERROR, "PH-RACH-INDICATION has %d bits\n",
 			ra_ind->sapi);
 		msgb_free(l1p_msg);
 		return 0;
 	}
 
+
+	if (ra_ind->msgUnitParam.u8Size == 2) {
+		is_11bit = 1;
+		ra = ra_ind->msgUnitParam.u8Buffer[0];
+		ra = ra << 3;
+		temp = (ra_ind->msgUnitParam.u8Buffer[1] & 0x7);
+		ra = ra | temp;
+	} else {
+		is_11bit = 0;
+		ra = ra_ind->msgUnitParam.u8Buffer[0];
+	}
+
 	fn = ra_ind->u32Fn;
-	ra = ra_ind->msgUnitParam.u8Buffer[0];
 	rc = msgb_trim(l1p_msg, sizeof(*l1sap));
 	if (rc < 0)
 		MSGB_ABORT(l1p_msg, "No room for primitive data\n");
@@ -986,6 +1000,29 @@
 	l1sap->u.rach_ind.ra = ra;
 	l1sap->u.rach_ind.acc_delay = acc_delay;
 	l1sap->u.rach_ind.fn = fn;
+	l1sap->u.rach_ind.is_11bit = is_11bit; /* no of bits in 11 bit RACH */
+
+	/* mapping of the burst type, the values are specific to
+	 * osmo-bts-litecell15 */
+	switch (burst_type) {
+	case GsmL1_BurstType_Access_0:
+		l1sap->u.rach_ind.burst_type =
+			GSM_L1_BURST_TYPE_ACCESS_0;
+		break;
+	case GsmL1_BurstType_Access_1:
+		l1sap->u.rach_ind.burst_type =
+			GSM_L1_BURST_TYPE_ACCESS_1;
+		break;
+	case GsmL1_BurstType_Access_2:
+		l1sap->u.rach_ind.burst_type =
+			GSM_L1_BURST_TYPE_ACCESS_2;
+		break;
+	default:
+		l1sap->u.rach_ind.burst_type =
+			GSM_L1_BURST_TYPE_NONE;
+		break;
+	}
+
 	if (!lchan || lchan->ts->pchan == GSM_PCHAN_CCCH ||
 	    lchan->ts->pchan == GSM_PCHAN_CCCH_SDCCH4)
 		l1sap->u.rach_ind.chan_nr = 0x88;

-- 
To view, visit https://gerrit.osmocom.org/1168
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Ie5207a15424fb287febf74e830297531232accde
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Owner: bhargava_abhyankar <Bhargava.Abhyankar at radisys.com>