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Paging (RRC): handle PCCH in RRC

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In NR RRC idle or inactive, decode PCCH SDUs from MAC and scan Paging
records (TS 38.331 §5.3.2.3) for ng-5G-S-TMSI against the UE M-TMSI
(lower 32 bits of fiveG_S_TMSI). PCCH is ignored in other states.

Changes:
- Add nr_rrc_ue_decode_pcch(): call nr_pcch_decode(), compare each
  ng-5G-S-TMSI M-TMSI to (fiveG_S_TMSI & UINT32_MAX), return on match
  or failure
- In rrc_nrue(), handle NR_RRC_MAC_PCCH_DATA_IND by wrapping sdu/
  sdu_size in byte_array_t, calling nr_rrc_ue_decode_pcch()

Signed-off-by: Guido Casati <guido.casati@openairinterface.org>
This commit is contained in:
Guido Casati
2026-03-27 16:18:53 +01:00
parent 6cba089c34
commit 21b901aefc
1 changed files with 46 additions and 0 deletions
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46
openair2/RRC/NR_UE/rrc_UE.c
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@@ -14,6 +14,7 @@
#include "NR_DL-CCCH-Message.h" //asn_DEF_NR_DL_CCCH_Message
#include "NR_BCCH-BCH-Message.h" //asn_DEF_NR_BCCH_BCH_Message
#include "NR_BCCH-DL-SCH-Message.h" //asn_DEF_NR_BCCH_DL_SCH_Message
#include "NR_PCCH-Message.h" //asn_DEF_NR_PCCH_Message
#include "NR_CellGroupConfig.h" //asn_DEF_NR_CellGroupConfig
#include "NR_BWP-Downlink.h" //asn_DEF_NR_BWP_Downlink
#include "NR_RRCReconfiguration.h"
@@ -38,6 +39,8 @@
#include "openair3/SECU/key_nas_deriver.h"
#include "common/utils/LOG/log.h"
#include "conversions.h"
#include "common/utils/ds/byte_array.h"
#ifndef CELLULAR
#include "RRC/NR/MESSAGES/asn1_msg.h"
@@ -2289,6 +2292,41 @@ static int8_t nr_rrc_ue_decode_ccch(NR_UE_RRC_INST_t *rrc, const NRRrcMacCcchDat
return rval;
}
/** @brief Decode a PCCH paging message and scan its paging records (TS 38.331 §5.3.2.3).
* @return -1 on decode error, 0 if no match is found, 1 if a record matches the UE */
static int8_t nr_rrc_ue_decode_pcch(NR_UE_RRC_INST_t *rrc, const byte_array_t pcch)
{
// Paging is only relevant in RRC_IDLE and RRC_INACTIVE.
if (rrc->nrRrcState != RRC_STATE_IDLE_NR && rrc->nrRrcState != RRC_STATE_INACTIVE_NR) {
LOG_D(NR_RRC, "[UE %ld] Ignoring PCCH in RRC state %d\n", rrc->ue_id, rrc->nrRrcState);
return 0;
}
LOG_D(NR_RRC, "[UE %ld] Decoding PCCH message (%zu bytes), State %d\n", rrc->ue_id, pcch.len, rrc->nrRrcState);
nr_paging_params_t params[NR_PCCH_MAX_PAGING_RECORDS];
int count = 0;
if (nr_pcch_decode(pcch, params, &count) != 0) {
LOG_E(NR_RRC, "[UE %ld] Failed to decode PCCH message (%zu bytes)\n", rrc->ue_id, pcch.len);
log_dump(NR_RRC, pcch.buf, pcch.len, LOG_DUMP_CHAR, " Received bytes:\n");
return -1;
}
LOG_D(NR_RRC, "[UE %ld] Received Paging message with %d record(s)\n", rrc->ue_id, count);
const uint64_t ue_fiveg_s_tmsi = rrc->fiveG_S_TMSI & ((1ULL << 48) - 1);
for (int i = 0; i < count; i++) {
if (params[i].ue_identity_type == NR_PagingUE_Identity_PR_ng_5G_S_TMSI
&& params[i].ue_identity.fiveg_s_tmsi == ue_fiveg_s_tmsi) {
LOG_I(NR_RRC, "[UE %ld] Paging record %d matches 5G-S-TMSI=0x%012lu\n", rrc->ue_id, i, ue_fiveg_s_tmsi);
return 1;
}
}
LOG_D(NR_RRC, "[UE %ld] No paging match found in PagingRecordList\n", rrc->ue_id);
return 0;
}
static void nr_rrc_ue_process_securityModeCommand(NR_UE_RRC_INST_t *ue_rrc,
NR_SecurityModeCommand_t *const securityModeCommand,
int srb_id,
@@ -3183,6 +3221,14 @@ void *rrc_nrue(void *notUsed)
nr_rrc_ue_decode_ccch(rrc, ind);
} break;
case NR_RRC_MAC_PCCH_DATA_IND: {
NRRrcMacPcchDataInd *ind = &NR_RRC_MAC_PCCH_DATA_IND(msg_p);
const byte_array_t pcch = {.len = ind->sdu_size, .buf = ind->sdu};
if (nr_rrc_ue_decode_pcch(rrc, pcch) == 1) {
LOG_I(NR_RRC, "[UE %ld] Paging match found in PagingRecordList\n", rrc->ue_id);
}
} break;
case NR_RRC_DCCH_DATA_IND:
nr_rrc_ue_decode_dcch(rrc,
NR_RRC_DCCH_DATA_IND(msg_p).dcch_index,