jolly has submitted this change. ( https://gerrit.osmocom.org/c/osmocom-bb/+/34481?usp=email )

Change subject: Transmit access bursts on DCCH of TCH channels ......................................................................

Transmit access bursts on DCCH of TCH channels

This is required to access a TCH during handover or to access the uplink of a VGCS channel.

The patch is taken from the handover branch.

Change-Id: I1a972d9bac5749c67c1b139825400854f7cf1490 --- M src/target/firmware/layer1/prim_rach.c 1 file changed, 29 insertions(+), 2 deletions(-)

Approvals: pespin: Looks good to me, but someone else must approve Jenkins Builder: Verified laforge: Looks good to me, but someone else must approve fixeria: Looks good to me, approved

diff --git a/src/target/firmware/layer1/prim_rach.c b/src/target/firmware/layer1/prim_rach.c index 9536e5f..20dab5f 100644 --- a/src/target/firmware/layer1/prim_rach.c +++ b/src/target/firmware/layer1/prim_rach.c @@ -127,7 +127,7 @@ 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 45, 46};

-/* request a RACH request at the next multiframe T3 = fn51 */ +/* schedule access burst */ void l1a_rach_req(uint16_t offset, uint8_t combined, uint8_t ra) { uint32_t fn_sched; @@ -136,7 +136,19 @@ offset += 3;

local_firq_save(flags); - if (combined) { + if (l1s.dedicated.type == GSM_DCHAN_TCH_F) { + fn_sched = l1s.current_time.fn + offset; + /* go next DCCH frame TCH/F channel */ + if ((fn_sched % 13) == 12) + fn_sched++; + } else if (l1s.dedicated.type == GSM_DCHAN_TCH_H) { + fn_sched = l1s.current_time.fn + offset; + /* go next DCCH frame of TCH/H channel */ + if ((fn_sched % 13) == 12) + fn_sched++; + if ((l1s.dedicated.tn & 1) != ((fn_sched % 13) & 1)) + fn_sched++; + } else if (combined) { /* add elapsed RACH slots to offset */ offset += t3_to_rach_comb[l1s.current_time.t3]; /* offset is the number of RACH slots in the future */ @@ -146,6 +158,7 @@ } else fn_sched = l1s.current_time.fn + offset; l1s.rach.ra = ra; + fn_sched %= GSM_MAX_FN; sched_gsmtime(rach_sched_set_ul, fn_sched, 0); local_irq_restore(flags);