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Harald Welte gerrit-no-reply at lists.osmocom.orgHarald Welte has submitted this change and it was merged. ( https://gerrit.osmocom.org/10001 ) Change subject: trxcon: fix tail bits at the front of Access burst ...................................................................... trxcon: fix tail bits at the front of Access burst Currently Access Burst generated by trxcon has 8 zero bits at the beginning. According to the 3GPP 05.02 specification (Chapter 5.2.7 Access burst) custom 8-bit extended tail bits sequence should be used: (BN0, BN1, BN2 ... BN7) = (0,0,1,1,1,0,1,0) After this fix trxcon sets correct 8-bit sequence at the front of Access burst. Change-Id: I1f624e783de6c585d2e292965c9e5810b0a4f27d --- M src/host/trxcon/sched_lchan_rach.c 1 file changed, 10 insertions(+), 1 deletion(-) Approvals: Jenkins Builder: Verified Harald Welte: Looks good to me, approved diff --git a/src/host/trxcon/sched_lchan_rach.c b/src/host/trxcon/sched_lchan_rach.c index 2a09a37..3f6e2e1 100644 --- a/src/host/trxcon/sched_lchan_rach.c +++ b/src/host/trxcon/sched_lchan_rach.c @@ -42,6 +42,15 @@ #include "l1ctl.h" /** + * 8-bit RACH extended tail bits + * GSM 05.02 Chapter 5.2.7 Access burst (AB) + */ + +static ubit_t rach_ext_tail_bits[] = { + 0, 0, 1, 1, 1, 0, 1, 0, +}; + +/** * 41-bit RACH synchronization sequence * GSM 05.02 Chapter 5.2.7 Access burst (AB) */ @@ -79,7 +88,7 @@ } /* Compose RACH burst */ - memset(burst, 0, 8); /* TB */ + memcpy(burst, rach_ext_tail_bits, 8); /* TB */ memcpy(burst + 8, rach_synch_seq, 41); /* sync seq */ memcpy(burst + 49, payload, 36); /* payload */ memset(burst + 85, 0, 63); /* TB + GP */ -- To view, visit https://gerrit.osmocom.org/10001 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmocom-bb Gerrit-Branch: master Gerrit-MessageType: merged Gerrit-Change-Id: I1f624e783de6c585d2e292965c9e5810b0a4f27d Gerrit-Change-Number: 10001 Gerrit-PatchSet: 1 Gerrit-Owner: Piotr Krysik <ptrkrysik at gmail.com> Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org> Gerrit-Reviewer: Jenkins Builder -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20180716/6b89a8ac/attachment.htm>