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Add NGAP RAN Status Transfer enc/dec and handlers (UL and DL)

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According to 4.9.1.3.3 of 3GPP TS 23.502:

> 2a. - 2c. The S-RAN sends the Uplink RAN Status Transfer message to the S-AMF,
> as specified in TS 36.300 [46] and TS 38.300 [9]. The S-RAN may omit sending
> this message if none of the radio bearers of the UE shall be treated with PDCP status preservation.

TS 38.300 says:
> For DRBs not configured with DAPS, the source gNB sends the SN STATUS TRANSFER message to the target
> gNB to convey the uplink PDCP SN receiver status and the downlink PDCP SN transmitter status of DRBs for
> which PDCP status preservation applies (i.e. for RLC AM). The uplink PDCP SN receiver status includes at
> least the PDCP SN of the first missing UL PDCP SDU and may include a bit map of the receive status of the out
> of sequence UL PDCP SDUs that the UE needs to retransmit in the target cell, if any. The downlink PDCP SN
> transmitter status indicates the next PDCP SN that the target gNB shall assign to new PDCP SDUs, not having a
> PDCP SN yet.

i.e., for DRBs for which PDCP status preservation applies (i.e. for RLC AM), which is is our case.

This commit introduces full support for NG-RAN Status Transfer message handling
(TS 38.413 §9.2.3.13-14) in CU. It enables correct state transfer of PDCP COUNT
values (SN + HFN) during mobility or recovery scenarios.

Summary of changes - NGAP:
* Added encoding/decoding support for UL/DL RAN Status Transfer message
* Defined structures for: ngap_drb_count_value_t, ngap_drb_status_t,
  ngap_ran_status_container_t, ngap_ran_status_transfer_t
This commit is contained in:
Guido Casati
2025-09-18 11:34:31 +02:00
parent 1015c1f5f0
commit bc9c59f186
9 changed files with 262 additions and 1 deletions
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openair3/NGAP/ngap_gNB_decoder.c
+6
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@@ -100,6 +100,12 @@ static int ngap_gNB_decode_initiating_message(NGAP_NGAP_PDU_t *pdu) {
NGAP_INFO("Handover Resource Allocation initiating message\n");
break;
case NGAP_ProcedureCode_id_DownlinkRANStatusTransfer:
res = asn_encode_to_new_buffer(NULL, ATS_CANONICAL_XER, &asn_DEF_NGAP_NGAP_PDU, pdu);
free(res.buffer);
NGAP_INFO("DL RAN Status Transfer initiating message\n");
break;
default:
NGAP_ERROR("Unknown procedure ID (%d) for initiating message\n",
(int)pdu->choice.initiatingMessage->procedureCode);