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GTPU: CU has to send NR-U Sequence Number

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This is in 3GPP TS 38.425.

Because it was not done, there was a problem of interoperability
between openair CU and srsran DU. No DL traffic was reaching the UE.

A new GTPU API function is introduced: gtpv1uSendDirectWithNRUSeqNum().
It is only used in the gNB CU, in PDCP. So it was decided to not add a
new parameter to gtpv1uSendDirect() but instead add a new API function.
This commit is contained in:
Cedric Roux
2025-08-21 09:30:41 +02:00
committed by Robert Schmidt
parent 84ce708f96
commit 807b38ddae
3 changed files with 91 additions and 11 deletions
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openair2/LAYER2/nr_pdcp/nr_pdcp_oai_api.c
+1 -1
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@@ -469,7 +469,7 @@ static void deliver_pdu_drb_gnb(void *deliver_pdu_data, ue_id_t ue_id, int rb_id
if (NODE_IS_CU(node_type)) {
LOG_D(PDCP, "%s() (drb %d) sending message to gtp size %d\n", __func__, rb_id, size);
extern instance_t CUuniqInstance;
gtpv1uSendDirect(CUuniqInstance, ue_id, rb_id, (uint8_t *)buf, size, false, false);
gtpv1uSendDirectWithNRUSeqNum(CUuniqInstance, ue_id, rb_id, (uint8_t *)buf, size);
} else {
uint8_t *memblock = malloc16(size);
memcpy(memblock, buf, size);