Change in osmocom-bb[master]: trxcon/trx_if.c: drop Timing Advance range limitation

[Vadim Yanitskiy]

Vadim Yanitskiy has uploaded this change for review. ( https://gerrit.osmocom.org/10817


Change subject: trxcon/trx_if.c: drop Timing Advance range limitation
......................................................................

trxcon/trx_if.c: drop Timing Advance range limitation

Despite the correct range of Timing Advance value is [0..63],
there is a special feature in OsmocomBB which allows one to
simulate the distance between both MS and a BTS by playing
with the signal delay.

This is why a signed 'int8_t' type is used in L1CTL protocol.
No need to limit the range, just forward it to TRX.

Change-Id: I06774b315b8451bf14083da6b2849d6e8594abc8
---
M src/host/trxcon/trx_if.c
1 file changed, 3 insertions(+), 7 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/17/10817/1

diff --git a/src/host/trxcon/trx_if.c b/src/host/trxcon/trx_if.c
index 89331f3..7e6f7b9 100644
--- a/src/host/trxcon/trx_if.c
+++ b/src/host/trxcon/trx_if.c
@@ -405,7 +405,9 @@
  * advance calculated from requested TA value. This value is
  * normally between 0 and 63, with each step representing
  * an advance of one bit period (about 3.69 microseconds).
- * CMD SETTA <0-63>
+ * Since OsmocomBB has a special feature, which allows one
+ * to spoof the distance from BTS, the range is extended.
+ * CMD SETTA <-128..127>
  * RSP SETTA <status> <TA>
  */
 
@@ -415,12 +417,6 @@
 	if (trx->ta == ta)
 		return 0;
 
-	/* Make sure that TA value is in valid range */
-	if (ta < 0 || ta > 63) {
-		LOGP(DTRX, LOGL_ERROR, "TA value %d is out of allowed range\n", ta);
-		return -ENOTSUP;
-	}
-
 	return trx_ctrl_cmd(trx, 0, "SETTA", "%d", ta);
 }
 

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Gerrit-Project: osmocom-bb
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I06774b315b8451bf14083da6b2849d6e8594abc8
Gerrit-Change-Number: 10817
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>
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