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Merge remote-tracking branch 'origin/fix_NR_RLC_Config_during_RRCReestablishment' into integration_2025_w46 (!3760)

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gNB: modify RLC configuration applied for SRB1 during RRCReestablishment

TS 38.331 clause 5.3.7.4 specifies to apply the configuration defined in
9.2.1 for SRB1 at UE side. This implies that the gNB also has to apply
sn_field_length = 12, but there are no implications on the other RLC
parameters.

As wrong timer values break SRB1 e.g. for long RTT NTN scenarios, this
commit switches to using the RLC timer values provided in the
configuration file. Currently we still set poll_pdu, poll_byte and
max_retx_threshold to the values defined in 9.2.1, but this can be
changed.
This commit is contained in:
Robert Schmidt
2025-11-15 10:54:56 +01:00
parent 946810e39e eb7ca9663c
commit b57495b38d
3 changed files with 35 additions and 22 deletions
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openair2/LAYER2/NR_MAC_gNB/mac_rrc_dl_handler.c
+9 -2
View File
@@ -980,8 +980,15 @@ void dl_rrc_message_transfer(const f1ap_dl_rrc_message_t *dl_rrc)
pthread_mutex_unlock(&mac->sched_lock);
nr_rlc_remove_ue(dl_rrc->gNB_DU_ue_id);
nr_rlc_update_id(*dl_rrc->old_gNB_DU_ue_id, dl_rrc->gNB_DU_ue_id);
/* 38.331 clause 5.3.7.4: apply the specified configuration defined in 9.2.1 for SRB1 */
nr_rlc_reconfigure_entity(dl_rrc->gNB_DU_ue_id, 1, NULL);
/* 38.331 clause 5.3.7.4: apply gNB RLC configuration for SRB1 to match the UE RLC configuration defined in 9.2.1 */
nr_rlc_configuration_t rlc_configuration = mac->rlc_config; // use configuration file values for timers t_poll_retransmit, t_reassembly and t_status_prohibit
rlc_configuration.srb.poll_pdu = -1;
rlc_configuration.srb.poll_byte = -1;
rlc_configuration.srb.max_retx_threshold = 8;
rlc_configuration.srb.sn_field_length = 12;
NR_RLC_Config_t *rlc_Config = nr_srb_config(&rlc_configuration);
nr_rlc_reconfigure_entity(dl_rrc->gNB_DU_ue_id, 1, rlc_Config);
ASN_STRUCT_FREE(asn_DEF_NR_RLC_Config, rlc_Config);
instance_t f1inst = get_f1_gtp_instance();
if (f1inst >= 0) // we actually use F1-U
gtpv1u_update_ue_id(f1inst, *dl_rrc->old_gNB_DU_ue_id, dl_rrc->gNB_DU_ue_id);
openair2/LAYER2/NR_MAC_gNB/nr_radio_config.c
+23 -20
View File
@@ -3538,6 +3538,24 @@ static NR_SpCellConfig_t *get_initial_SpCellConfig(int uid,
return SpCellConfig;
}
struct NR_RLC_Config *nr_srb_config(const nr_rlc_configuration_t *default_rlc_config)
{
NR_RLC_Config_t *rlc_Config = calloc(1, sizeof(NR_RLC_Config_t));
rlc_Config->present = NR_RLC_Config_PR_am;
rlc_Config->choice.am = calloc(1, sizeof(*rlc_Config->choice.am));
rlc_Config->choice.am->dl_AM_RLC.sn_FieldLength = calloc(1, sizeof(NR_SN_FieldLengthAM_t));
*(rlc_Config->choice.am->dl_AM_RLC.sn_FieldLength) = encode_sn_field_length_am(default_rlc_config->srb.sn_field_length);
rlc_Config->choice.am->dl_AM_RLC.t_Reassembly = encode_t_reassembly(default_rlc_config->srb.t_reassembly);
rlc_Config->choice.am->dl_AM_RLC.t_StatusProhibit = encode_t_status_prohibit(default_rlc_config->srb.t_status_prohibit);
rlc_Config->choice.am->ul_AM_RLC.sn_FieldLength = calloc(1, sizeof(NR_SN_FieldLengthAM_t));
*(rlc_Config->choice.am->ul_AM_RLC.sn_FieldLength) = encode_sn_field_length_am(default_rlc_config->srb.sn_field_length);
rlc_Config->choice.am->ul_AM_RLC.t_PollRetransmit = encode_t_poll_retransmit(default_rlc_config->srb.t_poll_retransmit);
rlc_Config->choice.am->ul_AM_RLC.pollPDU = encode_poll_pdu(default_rlc_config->srb.poll_pdu);
rlc_Config->choice.am->ul_AM_RLC.pollByte = encode_poll_byte(default_rlc_config->srb.poll_byte);
rlc_Config->choice.am->ul_AM_RLC.maxRetxThreshold = encode_max_retx_threshold(default_rlc_config->srb.max_retx_threshold);
return rlc_Config;
}
NR_RLC_BearerConfig_t *get_SRB_RLC_BearerConfig(long channelId,
long priority,
long bucketSizeDuration,
@@ -3551,20 +3569,7 @@ NR_RLC_BearerConfig_t *get_SRB_RLC_BearerConfig(long channelId,
rlc_BearerConfig->servedRadioBearer->choice.srb_Identity = channelId;
rlc_BearerConfig->reestablishRLC = NULL;
NR_RLC_Config_t *rlc_Config = calloc(1, sizeof(NR_RLC_Config_t));
rlc_Config->present = NR_RLC_Config_PR_am;
rlc_Config->choice.am = calloc(1, sizeof(*rlc_Config->choice.am));
rlc_Config->choice.am->dl_AM_RLC.sn_FieldLength = calloc(1, sizeof(NR_SN_FieldLengthAM_t));
*(rlc_Config->choice.am->dl_AM_RLC.sn_FieldLength) = encode_sn_field_length_am(default_rlc_config->srb.sn_field_length);
rlc_Config->choice.am->dl_AM_RLC.t_Reassembly = encode_t_reassembly(default_rlc_config->srb.t_reassembly);
rlc_Config->choice.am->dl_AM_RLC.t_StatusProhibit = encode_t_status_prohibit(default_rlc_config->srb.t_status_prohibit);
rlc_Config->choice.am->ul_AM_RLC.sn_FieldLength = calloc(1, sizeof(NR_SN_FieldLengthAM_t));
*(rlc_Config->choice.am->ul_AM_RLC.sn_FieldLength) = encode_sn_field_length_am(default_rlc_config->srb.sn_field_length);
rlc_Config->choice.am->ul_AM_RLC.t_PollRetransmit = encode_t_poll_retransmit(default_rlc_config->srb.t_poll_retransmit);
rlc_Config->choice.am->ul_AM_RLC.pollPDU = encode_poll_pdu(default_rlc_config->srb.poll_pdu);
rlc_Config->choice.am->ul_AM_RLC.pollByte = encode_poll_byte(default_rlc_config->srb.poll_byte);
rlc_Config->choice.am->ul_AM_RLC.maxRetxThreshold = encode_max_retx_threshold(default_rlc_config->srb.max_retx_threshold);
rlc_BearerConfig->rlc_Config = rlc_Config;
rlc_BearerConfig->rlc_Config = nr_srb_config(default_rlc_config);
NR_LogicalChannelConfig_t *logicalChannelConfig = calloc(1, sizeof(NR_LogicalChannelConfig_t));
logicalChannelConfig->ul_SpecificParameters = calloc(1, sizeof(*logicalChannelConfig->ul_SpecificParameters));
@@ -3584,10 +3589,9 @@ NR_RLC_BearerConfig_t *get_SRB_RLC_BearerConfig(long channelId,
return rlc_BearerConfig;
}
static void nr_drb_config(struct NR_RLC_Config *rlc_Config,
NR_RLC_Config_PR rlc_config_pr,
const nr_rlc_configuration_t *default_rlc_config)
struct NR_RLC_Config *nr_drb_config(NR_RLC_Config_PR rlc_config_pr, const nr_rlc_configuration_t *default_rlc_config)
{
NR_RLC_Config_t *rlc_Config = calloc(1, sizeof(NR_RLC_Config_t));
switch (rlc_config_pr) {
case NR_RLC_Config_PR_um_Bi_Directional:
// RLC UM Bi-directional Bearer configuration
@@ -3620,6 +3624,7 @@ static void nr_drb_config(struct NR_RLC_Config *rlc_Config,
break;
}
rlc_Config->present = rlc_config_pr;
return rlc_Config;
}
NR_RLC_BearerConfig_t *get_DRB_RLC_BearerConfig(long lcChannelId,
@@ -3635,9 +3640,7 @@ NR_RLC_BearerConfig_t *get_DRB_RLC_BearerConfig(long lcChannelId,
rlc_BearerConfig->servedRadioBearer->choice.drb_Identity = drbId;
rlc_BearerConfig->reestablishRLC = NULL;
NR_RLC_Config_t *rlc_Config = calloc(1, sizeof(NR_RLC_Config_t));
nr_drb_config(rlc_Config, rlc_conf, default_rlc_config);
rlc_BearerConfig->rlc_Config = rlc_Config;
rlc_BearerConfig->rlc_Config = nr_drb_config(rlc_conf, default_rlc_config);
NR_LogicalChannelConfig_t *logicalChannelConfig = calloc(1, sizeof(NR_LogicalChannelConfig_t));
logicalChannelConfig->ul_SpecificParameters = calloc(1, sizeof(*logicalChannelConfig->ul_SpecificParameters));
openair2/LAYER2/NR_MAC_gNB/nr_radio_config.h
+3
View File
@@ -112,6 +112,9 @@ NR_CellGroupConfig_t *get_default_secondaryCellGroup(const NR_ServingCellConfigC
NR_ReconfigurationWithSync_t *get_reconfiguration_with_sync(rnti_t rnti, uid_t uid, const NR_ServingCellConfigCommon_t *scc, int frame);
struct NR_RLC_Config *nr_srb_config(const nr_rlc_configuration_t *default_rlc_config);
struct NR_RLC_Config *nr_drb_config(NR_RLC_Config_PR rlc_config_pr, const nr_rlc_configuration_t *default_rlc_config);
NR_RLC_BearerConfig_t *get_SRB_RLC_BearerConfig(long channelId,
long priority,
long bucketSizeDuration,