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laforge gerrit-no-reply at lists.osmocom.orglaforge has submitted this change. ( https://gerrit.osmocom.org/c/osmocom-bb/+/16663 ) Change subject: layer23: Identify AGCH from PCH on tx of GSMTAP downlink messages ...................................................................... layer23: Identify AGCH from PCH on tx of GSMTAP downlink messages Some bits are taken from osmo-bts l1sap.c Change-Id: I0adab003a4060c9cef730e0432859659c51bd087 --- M src/host/layer23/src/common/l1ctl.c 1 file changed, 46 insertions(+), 1 deletion(-) Approvals: laforge: Looks good to me, approved fixeria: Looks good to me, but someone else must approve Jenkins Builder: Verified diff --git a/src/host/layer23/src/common/l1ctl.c b/src/host/layer23/src/common/l1ctl.c index 9664561..d1385e5 100644 --- a/src/host/layer23/src/common/l1ctl.c +++ b/src/host/layer23/src/common/l1ctl.c @@ -50,6 +50,51 @@ extern struct gsmtap_inst *gsmtap_inst; +#define CB_FCCH -1 +#define CB_SCH -2 +#define CB_BCCH -3 +#define CB_IDLE -4 + +/* according to TS 05.02 Clause 7 Table 3 of 9 an Figure 8a */ +static const int ccch_block_table[51] = { + CB_FCCH, CB_SCH,/* 0..1 */ + CB_BCCH, CB_BCCH, CB_BCCH, CB_BCCH, /* 2..5: BCCH */ + 0, 0, 0, 0, /* 6..9: B0 */ + CB_FCCH, CB_SCH,/* 10..11 */ + 1, 1, 1, 1, /* 12..15: B1 */ + 2, 2, 2, 2, /* 16..19: B2 */ + CB_FCCH, CB_SCH,/* 20..21 */ + 3, 3, 3, 3, /* 22..25: B3 */ + 4, 4, 4, 4, /* 26..29: B4 */ + CB_FCCH, CB_SCH,/* 30..31 */ + 5, 5, 5, 5, /* 32..35: B5 */ + 6, 6, 6, 6, /* 36..39: B6 */ + CB_FCCH, CB_SCH,/* 40..41 */ + 7, 7, 7, 7, /* 42..45: B7 */ + 8, 8, 8, 8, /* 46..49: B8 */ + -4 /* 50: Idle */ +}; + +/* determine the CCCH block number based on the frame number */ +static unsigned int fn2ccch_block(uint32_t fn) +{ + int rc = ccch_block_table[fn%51]; + /* if FN is negative, we were called for something that's not CCCH! */ + OSMO_ASSERT(rc >= 0); + return rc; +} + +static uint8_t chantype_rsl2gsmtap_ext(uint8_t rsl_chantype, uint8_t link_id, uint32_t fn, uint8_t num_agch) +{ + uint8_t ret = chantype_rsl2gsmtap(rsl_chantype, link_id); + if (ret != GSMTAP_CHANNEL_PCH) + return ret; + + if (fn2ccch_block(fn) >= num_agch) + return GSMTAP_CHANNEL_PCH; + return GSMTAP_CHANNEL_AGCH; +} + static struct msgb *osmo_l1_alloc(uint8_t msg_type) { struct l1ctl_hdr *l1h; @@ -230,7 +275,7 @@ } /* send CCCH data via GSMTAP */ - gsmtap_chan_type = chantype_rsl2gsmtap(chan_type, dl->link_id); + gsmtap_chan_type = chantype_rsl2gsmtap_ext(chan_type, dl->link_id, tm.fn, ms->cellsel.si->bs_ag_blks_res); gsmtap_send(gsmtap_inst, ntohs(dl->band_arfcn), chan_ts, gsmtap_chan_type, chan_ss, tm.fn, dl->rx_level-110, dl->snr, ccch->data, sizeof(ccch->data)); -- To view, visit https://gerrit.osmocom.org/c/osmocom-bb/+/16663 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmocom-bb Gerrit-Branch: master Gerrit-Change-Id: I0adab003a4060c9cef730e0432859659c51bd087 Gerrit-Change-Number: 16663 Gerrit-PatchSet: 3 Gerrit-Owner: pespin <pespin at sysmocom.de> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: fixeria <axilirator at gmail.com> Gerrit-Reviewer: laforge <laforge at osmocom.org> Gerrit-MessageType: merged -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20191231/aec4691c/attachment.htm>