LTE 5G-NR Dual Connectivity Non-Standalone Access Signaling Messages

This document details messages involved in the 5G non-standalone access attach and bearer setup procedure. These messages are referenced from the 5G Non-Standalone Access Sequence Diagrams.

Message Path
LTE SIB2
└PLMN-InfoList-r15		 MN-eNB ➔ UE
LTE Preamble UE ➔ MN-eNB
PDCCH DCI Format 1A
└Format 1A - CRC Scrambled with RA-RNTI		 MN-eNB ➔ UE
LTE Random Access Response
└LTE MAC PDU
 └LTE MAC Payload for Random Access Response
  └LTE RAR UL Grant		 MN-eNB ➔ UE
RRC Connection Request UE ➔ MN-eNB
PDCCH DCI Format 1A
└Format 1A - CRC Scrambled with C-RNTI		 MN-eNB ➔ UE
RRC Connection Setup MN-eNB ➔ UE
PDCCH DCI Format 0
└Format 0 - CRC Scrambled with C-RNTI		 MN-eNB ➔ UE
RRC Connection Setup Complete
├Attach Request
└PDN Connectivity Request		 UE ➔ MN-eNB
Initial UE Message
├Attach Request
└PDN Connectivity Request		 MN-eNB ➔ MME
Authentication Request MME ➔ UE
Authentication Response UE ➔ MME
NAS Security Mode Command MME ➔ UE
NAS Security Mode Complete UE ➔ MME
Initial Context Setup Request
└Attach Accept
 └Activate Default EPS Bearer Context Request		 MME ➔ MN-eNB
UE Capability Enquiry MN-eNB ➔ UE
UE Capability Information
└UE-MRDC-Capability
└SupportedBandListNR-r15		 UE ➔ MN-eNB
UE Capability Info Indication MN-eNB ➔ MME
AS Security Mode Command MN-eNB ➔ UE
AS Security Mode Complete UE ➔ MN-eNB
RRC Connection Reconfiguration
└Attach Accept
 └Activate Default EPS Bearer Context Request
└MeasConfig
 └MeasObjectToAddModList
  └MeasObjectNR-r15		 MN-eNB ➔ UE
RRC Connection Reconfiguration Complete UE ➔ MN-eNB
Attach Complete
└Activate Default EPS Bearer Accept		 UE ➔ MME
Measurement Report
└MeasResults		 UE ➔ MN-eNB
SgNB Addition Request MN-eNB ➔ SN-gNB
SgNB Addition Request Acknowledge
└CG-Config		 SN-gNB ➔ MN-eNB
RRC Connection Reconfiguration for 5G-NR Bearer
└CG-Config		 MN-eNB ➔ UE
RRC Connection Reconfiguration Complete for 5G-NR Bearer
└NR RRCReconfigurationComplete		 UE ➔ MN-eNB
SgNB Reconfiguration Complete
└NR RRCReconfigurationComplete		 MN-eNB ➔ SN-gNB
SN Status Transfer MN-eNB ➔ SN-gNB
NR PSS SN-gNB ➔ UE
NR SSS SN-gNB ➔ UE
NR PBCH (MIB) SN-gNB ➔ UE
NR Preamble UE ➔ SN-gNB
NR PDCCH DCI Format 1_0
└Format 1_0 - CRC Scrambled with RA-RNTI		 SN-gNB ➔ UE
NR Random Access Response
└MAC PDU
 └MAC Payload for Random Access Response
  └RAR UL Grant		 SN-gNB ➔ UE
PDCCH DCI Format 1_0
└Format 1_0 - CRC Scrambled with C-RNTI		 SN-gNB ➔ UE
NR MAC PDU SN-gNB ➔ UE
PDCCH DCI Format 0_0
└Format 0_0 - CRC Scrambled with C-RNTI		 SN-gNB ➔ UE
NR MAC PDU UE ➔ SN-gNB
Dual Connectivity PHR MAC CE UE ➔ MN-eNB
Measurement Report
└MeasResults		 UE ➔ MN-eNB
RRC Transfer MN-eNB ➔ SN-gNB
Secondary RAT Data Usage Report
└Secondary RAT Usage Report list		 SN-gNB ➔ MN-eNB
gNB Status Indication SN-gNB ➔ MN-eNB

LTE SIB2

MN-eNB ➔ UE

TS 36.331

The SIB2 broadcast from the eNB signals the presence of 5G-NR PLMNs via the PLMN-InfoList-r15.

SystemInformationBlockType2 ::=		SEQUENCE {
  ac-BarringInfo  SEQUENCE {
    ac-BarringForEmergency	   BOOLEAN,
    ac-BarringForMO-Signalling AC-BarringConfig OPTIONAL,	-- Need OP
    ac-BarringForMO-Data	   AC-BarringConfig OPTIONAL	-- Need OP
  } OPTIONAL,	-- Need OP
  
  radioResourceConfigCommon		RadioResourceConfigCommonSIB,
  ue-TimersAndConstants			UE-TimersAndConstants,
  freqInfo				SEQUENCE {
    ul-CarrierFreq			  ARFCN-ValueEUTRA	 OPTIONAL,	-- Need OP
    ul-Bandwidth			  ENUMERATED {n6, n15, n25, n50, n75, n100}
    additionalSpectrumEmission	          AdditionalSpectrumEmission
  },
  mbsfn-SubframeConfigList		MBSFN-SubframeConfigList OPTIONAL,	-- Need OR
  timeAlignmentTimerCommon		TimeAlignmentTimer,
  ...,
  lateNonCriticalExtension		OCTET STRING (CONTAINING SystemInformationBlockType2-v8h0-IEs)	OPTIONAL,
  [[	ssac-BarringForMMTEL-Voice-r9		AC-BarringConfig		OPTIONAL,	-- Need OP
    ssac-BarringForMMTEL-Video-r9		AC-BarringConfig		OPTIONAL	-- Need OP
  ]],
  [[	ac-BarringForCSFB-r10		AC-BarringConfig			OPTIONAL	-- Need OP
  ]],
  [[	ac-BarringSkipForMMTELVoice-r12		ENUMERATED {true}		OPTIONAL,	-- Need OP
    ac-BarringSkipForMMTELVideo-r12		ENUMERATED {true}		OPTIONAL,	-- Need OP
    ac-BarringSkipForSMS-r12		ENUMERATED {true}		OPTIONAL,	-- Need OP
    ac-BarringPerPLMN-List-r12		AC-BarringPerPLMN-List-r12	OPTIONAL	-- Need OP
  ]],
  [[	voiceServiceCauseIndication-r12		ENUMERATED {true}		OPTIONAL	-- Need OP
  ]],
  [[	acdc-BarringForCommon-r13		ACDC-BarringForCommon-r13	OPTIONAL,	-- Need OP
    acdc-BarringPerPLMN-List-r13		ACDC-BarringPerPLMN-List-r13	OPTIONAL	-- Need OP
  ]],
  [[
    udt-RestrictingForCommon-r13		UDT-Restricting-r13				OPTIONAL, -- Need OR
    udt-RestrictingPerPLMN-List-r13		UDT-RestrictingPerPLMN-List-r13	OPTIONAL,	-- Need OR
    cIoT-EPS-OptimisationInfo-r13		CIOT-EPS-OptimisationInfo-r13	OPTIONAL,	-- Need OP
    useFullResumeID-r13			ENUMERATED {true}		OPTIONAL	-- Need OP
  ]],
  [[	unicastFreqHoppingInd-r13		ENUMERATED {true}		OPTIONAL	-- Need OP
  ]],
  [[	mbsfn-SubframeConfigList-v1430		MBSFN-SubframeConfigList-v1430	OPTIONAL,	-- Need OP
    videoServiceCauseIndication-r14		ENUMERATED {true}		OPTIONAL	-- Need OP
  ]],
  [[	plmn-InfoList-r15			PLMN-InfoList-r15		OPTIONAL	-- Need OP
  ]],
  [[	cp-EDT-r15				ENUMERATED {true}		OPTIONAL,	--  Need OR
    up-EDT-r15				ENUMERATED {true}		OPTIONAL,	--  Need OR
    idleModeMeasurements-r15		ENUMERATED {true}		OPTIONAL,	-- Need OR
    reducedCP-LatencyEnabled-r15		ENUMERATED {true}		OPTIONAL	-- Need OR
  ]],
  [[	mbms-ROM-ServiceIndication-r15	ENUMERATED {true}		        OPTIONAL	-- Need OR
  ]]
}

PLMN-InfoList-r15

Presence of PLMN-InfoList-r15 signals that PLMNs supporting 5G-NR services are available.

PLMN-InfoList-r15 ::=	SEQUENCE (SIZE (1..maxPLMN-r11)) OF PLMN-Info-r15

PLMN-Info-r15 ::=  SEQUENCE {
  upperLayerIndication-r15	      ENUMERATED {true}		OPTIONAL	-- Need OR
}

LTE Preamble

UE ➔ MN-eNB

TS 36.213, TS 36.321, TS 36.211

The UE picks a random preamble. The preamble is referenced with the Random Access Preamble Id (RAPID). The preamble transmission is a Zadoff-Chu sequence.

Each preamble transmission is associated with an RA-RNTI.

LTE RA-RNTI

The RA-RNTI associated with the PRACH in which the Random Access Preamble is transmitted, is computed as:

RA-RNTI= 1 + t_id + 10 × f_id

Where:

Identifier Description
t_id The index of the first subframe of the specified PRACH (0≤ t_id <10)
f_id The index of the specified PRACH within that subframe, in ascending order of frequency domain (0≤ f_id< 6)

PDCCH DCI Format 1A

MN-eNB ➔ UE

TS 36.212

DCI Format 1_0 is used to assign downlink resources.

Format 1A - CRC Scrambled with RA-RNTI

In response to a PRACH transmission, a UE attempts to detect a DCI Format 1A with PDCCH CRC scrambled by the RA-RNTI corresponding to the RACH transmission. The UE looks for message during a configured window of length ra-ResponseWindow.

The RA-RNTI scrambled DCI message signals the frequency and time resources assigned for the transmission of the Transport Block containing the Random Access Response message.

The following information is transmitted by means of the RA-RNTI scrambled DCI Format 1A:

Field Bits
Carrier Indicator 0 or 3
Format Discriminator 1 (should be 1 for Format 1A)
Localized/Distributed VRB assignment flag 1 (should be set to 0 for random access)
Resource block assignment ⌈log2(NRBDL(NRBDL + 1)/2)⌉
NRBDL is the system bandwidth expressed in RBs
Preamble Index 6
PRACH Mask Index 4

Format 1A - CRC Scrambled with C-RNTI

The following information is transmitted by a DCI Format 1A with PDCCH CRC scrambled by the assigned C-RNTI:

Field Bits
Carrier Indicator 0 or 3
Format Discriminator 1 (should be 1 for Format 1A)
Localized/Distributed VRB assignment flag 1
Resource block assignment ⌈log2(NRBDL(NRBDL + 1)/2)⌉
NRBDL is the system bandwidth expressed in RBs

LTE Random Access Response

MN-eNB ➔ UE

TS 36.213, TS 36.321

  1. The UE listens on the PDCCH addressed by the RA-RNTI.
  2. Once the PDCCH with the RA-RNTI is decoded, the UE uses the RB resources in the message to receive the downlink transport block.
  3. The downlink transport block contains the MAC PDU.

LTE MAC PDU

Field Description
LTE MAC Header MAC header containing subheaders for each MAC PDU
LTE MAC Random Access Response 1 Random access response for UE 1
LTE MAC Random Access Response 2 Random access response for UE 2
LTE MAC Random Access Response ... Random access response for UE ...
LTE MAC Random Access Response n

LTE MAC Header

MAC subheader 1 bit 1 bit 6-bit
MAC subheader 1 E T RAPID 1
MAC subheader 2 E T RAPID 2
MAC subheader 3 E T RAPID 3

LTE MAC Payload for Random Access Response

Field Description Bits
R Reserved bit (set to "0") 1
Timing Advance Command The Timing Advance Command field indicates the index value TA used to control the amount of timing adjustment that the MAC entity must apply in TS 36.213. 11
LTE RAR UL Grant The Uplink Grant field indicates the resources to be used on the uplink in TS 36.213 20
Temporary C-RNTI The Temporary C-RNTI field indicates the temporary identity that is used by the MAC entity during Random Access. 16

LTE RAR UL Grant

RAR grant field Number of bits
Hopping flag 1
Fixed size resource block assignment 10
Truncated modulation and coding scheme 4
TPC command for scheduled PUSCH 3
UL Delay 1
CSI request 1

RRC Connection Request

UE ➔ MN-eNB

TS 36.331

RRCConnectionRequest ::= SEQUENCE {
  criticalExtensions CHOICE {
 rrcConnectionRequest-r8 RRCConnectionRequest-r8-IEs,
 rrcConnectionRequest-r15 RRCConnectionRequest-5GC-r15-IEs
  }
}

RRCConnectionRequest-r8-IEs ::= SEQUENCE {
  ue-Identity InitialUE-Identity,
  establishmentCause EstablishmentCause,
  spare BIT STRING (SIZE (1))
}

RRCConnectionRequest-5GC-r15-IEs ::=  SEQUENCE {
  ue-Identity InitialUE-Identity-5GC,
  establishmentCause   EstablishmentCause-5GC,
  spare BIT STRING (SIZE (1))
}

InitialUE-Identity ::= CHOICE {
  s-TMSI S-TMSI,
  randomValue BIT STRING (SIZE (40))
}

InitialUE-Identity-5GC ::= CHOICE {
  ng-5G-S-TMSI-Part1 BIT STRING (SIZE (40)),
  randomValue BIT STRING (SIZE (40))
}

EstablishmentCause ::= ENUMERATED {
 emergency, highPriorityAccess, mt-Access, mo-Signalling,
 mo-Data, delayTolerantAccess-v1020, mo-VoiceCall-v1280, spare1}

EstablishmentCause-5GC ::= ENUMERATED {
 emergency, highPriorityAccess, mt-Access, mo-Signalling,
 mo-Data, mo-VoiceCall, spare2, spare1}

RRC Connection Setup

MN-eNB ➔ UE

TS 36.331

RRCConnectionSetup ::=SEQUENCE {
 rrc-TransactionIdentifier RRC-TransactionIdentifier,
 criticalExtensions CHOICE {
 c1 CHOICE {
  rrcConnectionSetup-r8RRCConnectionSetup-r8-IEs,
  spare7 NULL,
  spare6 NULL, spare5 NULL, spare4 NULL,
  spare3 NULL, spare2 NULL, spare1 NULL
 },
 criticalExtensionsFuture SEQUENCE {}
 }
}

RRCConnectionSetup-r8-IEs ::= SEQUENCE {
 radioResourceConfigDedicated RadioResourceConfigDedicated,
 nonCriticalExtensionRRCConnectionSetup-v8a0-IEs OPTIONAL
}

RRCConnectionSetup-v8a0-IEs ::= SEQUENCE {
 lateNonCriticalExtension OCTET STRING OPTIONAL,
 nonCriticalExtensionSEQUENCE {} OPTIONAL
}

PDCCH DCI Format 0

MN-eNB ➔ UE

TS 36.212

DCI Format 0 is used to assign uplink resources to the UE.

Format 0 - CRC Scrambled with C-RNTI

The following information is transmitted by a DCI Format 0 with PDCCH CRC scrambled by the assigned C-RNTI:

Field Bits
Carrier indicator 0 or 3
Identifier of DCI formats 1
Frequency hopping flag 1
Resource block assignment ⌈log2(NRBUL(NRBUL + 1)/2)⌉
NRBUL is the size of the uplink bandwidth expressed in RBs.
PUSCH 2
Modulation and coding scheme and redundancy version 5
New data indicator 1
HARQ process number 3
TPC command for scheduled PUSCH 2
Cyclic shift for DM RS 3
CSI Request 1 or 2
SRS Request 0 or 1

RRC Connection Setup Complete

UE ➔ MN-eNB

TS 36.331

The message also carries:

RRCConnectionSetupComplete ::=  SEQUENCE {
  rrc-TransactionIdentifier RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
  c1 CHOICE{
   rrcConnectionSetupComplete-r8  RRCConnectionSetupComplete-r8-IEs,
spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture SEQUENCE {}
  }
}

RRCConnectionSetupComplete-r8-IEs ::= SEQUENCE {
  selectedPLMN-Identity INTEGER (1..maxPLMN-r11),
  registeredMME RegisteredMME OPTIONAL,
  dedicatedInfoNAS DedicatedInfoNAS,
  nonCriticalExtension RRCConnectionSetupComplete-v8a0-IEs OPTIONAL  
}

RRCConnectionSetupComplete-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension OCTET STRING OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1020-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1020-IEs ::= SEQUENCE {
  gummei-Type-r10 ENUMERATED {native, mapped} OPTIONAL,
  rlf-InfoAvailable-r10 ENUMERATED {true} OPTIONAL,
  logMeasAvailable-r10 ENUMERATED {true} OPTIONAL,
  rn-SubframeConfigReq-r10 ENUMERATED {required, notRequired} OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1130-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1130-IEs ::= SEQUENCE {
  connEstFailInfoAvailable-r11  ENUMERATED {true} OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1250-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1250-IEs ::= SEQUENCE {
  mobilityState-r12 ENUMERATED {normal, medium, high, spare} OPTIONAL,
  mobilityHistoryAvail-r12 ENUMERATED {true} OPTIONAL,
  logMeasAvailableMBSFN-r12 ENUMERATED {true} OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1320-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1320-IEs ::= SEQUENCE {
  ce-ModeB-r13 ENUMERATED {supported} OPTIONAL,
  s-TMSI-r13 S-TMSI OPTIONAL,
  attachWithoutPDN-Connectivity-r13  ENUMERATED {true} OPTIONAL,
  up-CIoT-EPS-Optimisation-r13  ENUMERATED {true} OPTIONAL,
  cp-CIoT-EPS-Optimisation-r13  ENUMERATED {true} OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1330-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1330-IEs ::= SEQUENCE {
  ue-CE-NeedULGaps-r13 ENUMERATED {true} OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1430-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1430-IEs ::= SEQUENCE {
  dcn-ID-r14 INTEGER (0..65535) OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1530-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1530-IEs ::= SEQUENCE {
  logMeasAvailableBT-r15 ENUMERATED {true} OPTIONAL,
  logMeasAvailableWLAN-r15 ENUMERATED {true} OPTIONAL,
  idleMeasAvailable-r15 ENUMERATED {true} OPTIONAL,
  flightPathInfoAvailable-r15 ENUMERATED {true} OPTIONAL,
  connectTo5GC-r15 ENUMERATED {true} OPTIONAL,
  registeredAMF-r15 RegisteredAMF-r15 OPTIONAL,
  s-NSSAI-list-r15 SEQUENCE(SIZE (1..maxNrofS-NSSAI-r15)) OF S-NSSAI-r15 OPTIONAL,
  ng-5G-S-TMSI-Bits-r15 CHOICE {
  ng-5G-S-TMSI-r15 NG-5G-S-TMSI-r15,
  ng-5G-S-TMSI-Part2-r15 BIT STRING (SIZE (8))
  } OPTIONAL,
  nonCriticalExtension RRCConnectionSetupComplete-v1540-IEs OPTIONAL
}

RRCConnectionSetupComplete-v1540-IEs ::= SEQUENCE {
   gummei-Type-v1540 ENUMERATED {mappedFrom5G} OPTIONAL,
   guami-Type-r15 ENUMERATED {native, mapped} OPTIONAL,
   nonCriticalExtension SEQUENCE {} OPTIONAL
}

RegisteredMME ::= SEQUENCE {
   plmn-Identity PLMN-Identity OPTIONAL,
   mmegi BIT STRING (SIZE (16)),
   mmec MMEC
}

RegisteredAMF-r15  ::= SEQUENCE {
   plmn-Identity-r15 PLMN-Identity OPTIONAL,
   amf-Identifier-r15 AMF-Identifier-r15
}

Attach Request

UE ➔ MME

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Attach request message identity Message type M
EPS attach type EPS attach type M
NAS key set identifier NAS key set identifier M
EPS mobile identity EPS mobile identity M
UE network capability UE network capability M
ESM message container - PDN Connectivity Request ESM message container M
Old P-TMSI signature P-TMSI signature O
Additional GUTI EPS mobile identity O
Last visited registered TAI Tracking area identity O
DRX parameter DRX parameter O
MS network capability MS network capability O
Old location area identification Location area identification O
TMSI status TMSI status O
Mobile station classmark 2 Mobile station classmark 2 O
Mobile station classmark 3 Mobile station classmark 3 O
Supported Codecs Supported Codec List O
Additional update type Additional update type O
Voice domain preference and UE's usage setting Voice domain preference and UE's usage setting O
Device properties Device properties O
Old GUTI type GUTI type O
MS network feature support MS network feature support O
TMSI based NRI container Network resource identifier container O
T3324 value GPRS timer 2 O
T3412 extended value GPRS timer 3 O
Extended DRX parameters Extended DRX parameters O
UE additional security capability UE additional security capability O
UE status UE status O
Additional information requested Additional information requested O

UE Network Capability

TS 24.301

UE sets the DCNR bit in octet 9 to signal that it supports EN-DC dual connectivity

Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
EEA0 128-EEA1 128-EEA2 128-EEA3 EEA4 EEA5 EEA6 EEA7 octet 3
EIA0 128-EIA1 128-EIA2 128-EIA3 EIA4 EIA5 EIA6 EIA7 octet 4
UEA0 UEA1 UEA2 UEA3 UEA4 UEA5 UEA6 UEA7 octet 5
UCS2 UIA1 UIA2 UIA3 UIA4 UIA5 UIA6 UIA7 octet 6
ProSe-dd ProSe H.245-ASH ACC-CSFB LPP LCS 1xSRVCC NF octet 7
ePCO HC-CP CIoT ERw/oPDN S1-U data UP CIoT CP CIoT Prose-relay ProSe-dc octet 8
15 bearers SGC N1mode DCNR CP backoff RestrictEC V2X PC5 multipleDRB octet 9

PDN Connectivity Request

UE ➔ MME

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
EPS bearer identity EPS bearer identity M
Procedure transaction identity Procedure transaction identity M
PDN connectivity request message identity Message type M
Request type Request type M
PDN type PDN type M
ESM information transfer flag ESM information transfer flag O
Access point name Access point name O
Protocol configuration options Protocol configuration options O
Device properties Device properties O
NBIFOM container NBIFOM container O
Header compression configuration Header compression configuration O
Extended protocol configuration options Extended protocol configuration options O

Initial UE Message

MN-eNB ➔ MME

TS 36.413

IE/Group Name Presence Description
Message Type M
eNB UE S1AP ID M
NAS-PDU - Attach Request M
TAI M Indicating the Tracking Area from which the UE has sent the NAS message.
E-UTRAN CGI M Indicating the E-UTRAN CGI from which the UE has sent the NAS
RRC Establishment Cause M
S-TMSI O
CSG Id O
GUMMEI O
Cell Access Mode O
GW Transport Layer Address O Indicating GW Transport Layer Address if the GW is collocated with eNB.
Relay Node Indicator O Indicating a relay node.
GUMMEI Type O
Tunnel Information for BBF O Indicating HeNB’s Local IP Address assigned by the
SIPTO L-GW Transport Layer Address O Indicating SIPTO L-GW Transport Layer Address if the SIPTO L-GW is collocated with eNB.
LHN ID O
MME Group ID O
UE Usage Type O
CE-mode-B Support Indicator O
DCN ID O
Coverage Level O
UE Application Layer Measurement Capability O Each bit in the bitmap indicates an UE Application layer measurement capability.
EDT O

Authentication Request

MME ➔ UE

TS 24.301

Information element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Authentication request message type Message type M
NAS key set identifierASME NAS key set identifier M
Spare half octet Spare half octet M
Authentication parameter RAND (EPS challenge) Authentication parameter RAND M
Authentication parameter AUTN (EPS challenge) Authentication parameter M

Authentication Response

UE ➔ MME

TS 24.301

Information element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Authentication response message type Message type M
Authentication response parameter Authentication response parameter M

NAS Security Mode Command

MME ➔ UE

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Security mode command message identity Message type M
Selected NAS security algorithms NAS security algorithms M
NAS key set identifier NAS key set identifier M
Spare half octet Spare half octet M
Replayed UE security capabilities UE security capability M
IMEISV request IMEISV request O
Replayed nonceUE Nonce O
NonceMME Nonce O
HashMME HashMME O
Replayed UE additional security capability UE additional security capability O

NAS Security Mode Complete

UE ➔ MME

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Security mode complete message identity Message type M
IMEISV Mobile identity O
Replayed NAS message container Replayed NAS message container O

Initial Context Setup Request

MME ➔ MN-eNB

TS 36.413

IE/Group Name Presence
Message Type M
MME UE S1AP ID M
eNB UE S1AP ID M
UE Aggregate Maximum Bit Rate M
E-RAB to Be Setup List

E-RAB to Be Setup Item IEs [E-RAB ID]

IE/Group Name Presence
E-RAB ID M
E-RAB Level QoS Parameters M
Transport Layer Address M
GTP-TEID M
NAS-PDU - Attach Accept O
Correlation ID O
SIPTO Correlation ID O
Bearer Type O
IE/Group Name Presence
UE Security Capabilities M
Security Key M
Trace Activation O
Handover Restriction List O
UE Radio Capability O
Subscriber Profile ID for RAT/Frequency priority O
CS Fallback Indicator O
SRVCC Operation Possible O
CSG Membership Status O
Registered LAI O
GUMMEI O
MME UE S1AP ID 2 O
Management Based MDT Allowed O
Management Based MDT PLMN List O
Additional CS Fallback Indicator C-ifCSFBhighpriorit y
Masked IMEISV O
Expected UE Behaviour O
ProSe Authorized O
UE User Plane CIoT Support Indicator O
V2X Services Authorized O
UE Sidelink Aggregate Maximum Bit Rate O
Enhanced Coverage Restricted O
NR UE Security Capabilities O
CE-mode-B Restricted O
Aerial UE subscription information O
Pending Data Indication O
Subscription Based UE Differentiation Information O

Attach Accept

MME ➔ UE

TS 24.301

Information Element Presence
Protocol discriminator M
Security header type M
Attach accept message identity M
EPS attach result M
Spare half octet M
T3412 value M
TAI list M
ESM message container - Activate Default EPS Bearer Context Request M
GUTI O
Location area identification O
MS identity O
EMM cause O
T3402 value O
T3423 value O
Equivalent PLMNs O
Emergency number list O
EPS network feature support O
Additional update result O
T3412 extended value O
T3324 value O
Extended DRX parameters O
DCN-ID O
SMS services status O
Non-3GPP NW provided policies O
T3448 value O
Network policy O
T3447 value O
Extended emergency number list O
Ciphering key data O

Activate Default EPS Bearer Context Request

MME ➔ UE

TS 24.301

Information Element Type Presence
EPS bearer identity EPS bearer identity M
Procedure transaction identity Procedure transaction identity M
Activate default EPS bearer context request message identity Message type M
EPS QoS EPS quality of service M
Access point name Access point name M
PDN address PDN address M
Transaction identifier Transaction identifier O
Negotiated QoS Quality of service O
Negotiated LLC SAPI LLC service access point identifier O
Radio priority Radio priority O
Packet flow Identifier Packet flow Identifier O
APN-AMBR APN aggregate maximum bit rate O
ESM cause ESM cause O
Protocol configuration options Protocol configuration options O
Connectivity type Connectivity type O
WLAN offload indication WLAN offload acceptability O
NBIFOM container NBIFOM container O
Header compression configuration Header compression configuration O
Control plane only indication Control plane only indication O
Extended protocol configuration options Extended protocol configuration options O
Serving PLMN rate control Serving PLMN rate control O
Extended APN-AMBR Extended APN aggregate maximum bit rate O

UE Capability Enquiry

MN-eNB ➔ UE

TS 36.331

UECapabilityEnquiry ::= SEQUENCE {
  rrc-TransactionIdentifier     RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
   c1 CHOICE {
     ueCapabilityEnquiry-r8 UECapabilityEnquiry-r8-IEs,
     spare3 NULL, spare2 NULL, spare1 NULL
   },
   criticalExtensionsFuture     SEQUENCE {}
  }
}

UECapabilityEnquiry-r8-IEs ::=   SEQUENCE {
  ue-CapabilityRequest UE-CapabilityRequest,
  nonCriticalExtension UECapabilityEnquiry-v8a0-IEs   OPTIONAL
}

UE-CapabilityRequest ::= SEQUENCE (SIZE (1..maxRAT-Capabilities)) OF RAT-Type

RAT-Type

The IE RAT-Type is used to indicate the radio access technology (RAT), including E UTRA, of the requested/ transferred UE capabilities. A separate value applies for some EUTRA-NR capabilities that are transferred by a separate UE capability container, used in case of EN-DC.

RAT-Type ::=	ENUMERATED {
      eutra, utra, geran-cs, geran-ps, cdma2000-1XRTT,
      nr, eutra-nr, spare1, ...}

UE Capability Information

UE ➔ MN-eNB

TS 36.331

The message contains:

UECapabilityInformation ::=  SEQUENCE {
  rrc-TransactionIdentifier  RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
  c1  CHOICE{
    ueCapabilityInformation-r8  UECapabilityInformation-r8-IEs,
    spare7 NULL,
    spare6 NULL, spare5 NULL, spare4 NULL,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture  SEQUENCE {}
  }
}

UECapabilityInformation-r8-IEs ::=  SEQUENCE {
  ue-CapabilityRAT-ContainerList  UE-CapabilityRAT-ContainerList,
  nonCriticalExtension UECapabilityInformation-v8a0-IEs  OPTIONAL
}

UE-CapabilityRAT-ContainerList ::=SEQUENCE (SIZE (0..maxRAT-Capabilities)) OF UE-CapabilityRAT-Container

UE-CapabilityRAT-Container ::= SEQUENCE {
  rat-Type RAT-Type,
  ueCapabilityRAT-Container OCTET STRING
}

UE-MRDC-Capability

TS 38.331

UE-MRDC-Capability ::=   SEQUENCE {
  measAndMobParametersMRDC MeasAndMobParametersMRDC OPTIONAL,
  phy-ParametersMRDC-v1530 Phy-ParametersMRDC   OPTIONAL,
  rf-ParametersMRDC    RF-ParametersMRDC,
  generalParametersMRDC    GeneralParametersMRDC-XDD-Diff   OPTIONAL,
  rlc-Parameters   RLC-Parameters   OPTIONAL,
  mac-Parameters   MAC-Parameters   OPTIONAL,
  phy-Parameters   Phy-Parameters,
  rf-Parameters    RF-Parameters,
  measAndMobParameters MeasAndMobParameters OPTIONAL,
  fdd-Add-UE-NR-Capabilities   UE-NR-CapabilityAddXDD-Mode  OPTIONAL,
  tdd-Add-UE-NR-Capabilities   UE-NR-CapabilityAddXDD-Mode  OPTIONAL,
  fr1-Add-UE-NR-Capabilities   UE-NR-CapabilityAddFRX-Mode  OPTIONAL,
  fr2-Add-UE-NR-Capabilities   UE-NR-CapabilityAddFRX-Mode  OPTIONAL,
  featureSets  FeatureSets  OPTIONAL,
  featureSetCombinations   SEQUENCE (SIZE (1..maxFeatureSetCombinations)) OF FeatureSetCombination  OPTIONAL,

  lateNonCriticalExtension OCTET STRING OPTIONAL,
  nonCriticalExtension UE-NR-Capability-v1530   OPTIONAL
}

UE-NR-Capability-v1530 ::= SEQUENCE {
  fdd-Add-UE-NR-Capabilities-v1530  UE-NR-CapabilityAddXDD-Mode-v1530   OPTIONAL,
  tdd-Add-UE-NR-Capabilities-v1530  UE-NR-CapabilityAddXDD-Mode-v1530   OPTIONAL,
  dummy ENUMERATED {supported}  OPTIONAL,
  interRAT-Parameters   InterRAT-Parameters OPTIONAL,
  inactiveState ENUMERATED {supported}  OPTIONAL,
  delayBudgetReporting  ENUMERATED {supported}  OPTIONAL,
  nonCriticalExtension  UE-NR-Capability-1540   OPTIONAL
}

UE-NR-Capability-1540 ::=    SEQUENCE {
  sdap-Parameters  SDAP-Parameters  OPTIONAL,
  overheatingInd   ENUMERATED {supported}   OPTIONAL,
  ims-Parameters   IMS-Parameters   OPTIONAL,
  fr1-Add-UE-NR-Capabilities-v1540 UE-NR-CapabilityAddFRX-Mode-v1540    OPTIONAL,
  fr2-Add-UE-NR-Capabilities-v1540 UE-NR-CapabilityAddFRX-Mode-v1540    OPTIONAL,
  fr1-fr2-Add-UE-NR-Capabilities   UE-NR-CapabilityAddFRX-Mode  OPTIONAL,
  nonCriticalExtension SEQUENCE {}  OPTIONAL
}

UE-NR-CapabilityAddXDD-Mode ::=  SEQUENCE {
  phy-ParametersXDD-Diff   Phy-ParametersXDD-Diff   OPTIONAL,
  mac-ParametersXDD-Diff   MAC-ParametersXDD-Diff   OPTIONAL,
  measAndMobParametersXDD-Diff MeasAndMobParametersXDD-Diff OPTIONAL
}

UE-NR-CapabilityAddXDD-Mode-v1530 ::= SEQUENCE {
  eutra-ParametersXDD-Diff  EUTRA-ParametersXDD-Diff
}

UE-NR-CapabilityAddFRX-Mode ::= SEQUENCE {
  phy-ParametersFRX-Diff   Phy-ParametersFRX-Diff   OPTIONAL,
  measAndMobParametersFRX-Diff MeasAndMobParametersFRX-Diff OPTIONAL
}

UE-NR-CapabilityAddFRX-Mode-v1540 ::= SEQUENCE {
  ims-ParametersFRX-Diff IMS-ParametersFRX-Diff OPTIONAL
}

UE-EUTRA-Capability-v15 IEs

TS 36.331

UE-EUTRA-Capability-v1510-IEs ::= SEQUENCE {
  irat-ParametersNR-r15				IRAT-ParametersNR-r15			OPTIONAL,
  featureSetsEUTRA-r15				FeatureSetsEUTRA-r15			OPTIONAL,
  pdcp-ParametersNR-r15				PDCP-ParametersNR-r15			OPTIONAL,
  fdd-Add-UE-EUTRA-Capabilities-v1510		UE-EUTRA-CapabilityAddXDD-Mode-v1510	OPTIONAL,
  tdd-Add-UE-EUTRA-Capabilities-v1510		UE-EUTRA-CapabilityAddXDD-Mode-v1510	OPTIONAL,
  nonCriticalExtension				UE-EUTRA-Capability-v1520-IEs		OPTIONAL
}

UE-EUTRA-Capability-v1520-IEs ::= SEQUENCE {
  measParameters-v1520				MeasParameters-v1520,
  nonCriticalExtension				UE-EUTRA-Capability-v1530-IEs	        OPTIONAL
}

UE-EUTRA-Capability-v1530-IEs ::= SEQUENCE {
  measParameters-v1530					MeasParameters-v1530		OPTIONAL,
  otherParameters-v1530					Other-Parameters-v1530	        OPTIONAL,
  neighCellSI-AcquisitionParameters-v1530	                NeighCellSI-AcquisitionParameters-v1530	        OPTIONAL,
  mac-Parameters-v1530					MAC-Parameters-v1530		OPTIONAL,
  phyLayerParameters-v1530				PhyLayerParameters-v1530	OPTIONAL,
  rf-Parameters-v1530					RF-Parameters-v1530		OPTIONAL,
  pdcp-Parameters-v1530					PDCP-Parameters-v1530		OPTIONAL,
  ue-CategoryDL-v1530					INTEGER (22..26)		OPTIONAL,
  ue-BasedNetwPerfMeasParameters-v1530	                UE-BasedNetwPerfMeasParameters-v1530	        OPTIONAL,
  rlc-Parameters-v1530					RLC-Parameters-v1530		OPTIONAL,
  sl-Parameters-v1530					SL-Parameters-v1530		OPTIONAL,
  extendedNumberOfDRBs-r15				ENUMERATED {supported}		OPTIONAL,
  reducedCP-Latency-r15					ENUMERATED {supported}		OPTIONAL,
  laa-Parameters-v1530					LAA-Parameters-v1530		OPTIONAL,
  ue-CategoryUL-v1530					INTEGER (22..26)		OPTIONAL,
  fdd-Add-UE-EUTRA-Capabilities-v1530		        UE-EUTRA-CapabilityAddXDD-Mode-v1530	OPTIONAL,
  tdd-Add-UE-EUTRA-Capabilities-v1530		        UE-EUTRA-CapabilityAddXDD-Mode-v1530	OPTIONAL,
  nonCriticalExtension					UE-EUTRA-Capability-v1540-IEs		OPTIONAL
}

UE-EUTRA-Capability-v1540-IEs ::= SEQUENCE {
  phyLayerParameters-v1540				PhyLayerParameters-v1540		OPTIONAL,
  otherParameters-v1540					Other-Parameters-v1540,
  fdd-Add-UE-EUTRA-Capabilities-v1540		        UE-EUTRA-CapabilityAddXDD-Mode-v1540	OPTIONAL,
  tdd-Add-UE-EUTRA-Capabilities-v1540		        UE-EUTRA-CapabilityAddXDD-Mode-v1540	OPTIONAL,
  sl-Parameters-v1540				        SL-Parameters-v1540			OPTIONAL,
  irat-ParametersNR-v1540					IRAT-ParametersNR-v1540			OPTIONAL,
  nonCriticalExtension					SEQUENCE {}				OPTIONAL
}

IRAT-ParametersNR-r15

TS 36.331

IRAT-ParametersNR-r15 ::=		SEQUENCE {
  en-DC-r15				ENUMERATED {supported}	  OPTIONAL,
  eventB2-r15				ENUMERATED {supported}	  OPTIONAL,
  supportedBandListEN-DC-r15		SupportedBandListNR-r15	  OPTIONAL
}

SupportedBandListNR-r15

TS 36.331

SupportedBandListNR-r15 ::=		SEQUENCE (SIZE (1..maxBandsNR-r15)) OF SupportedBandNR-r15

SupportedBandNR-r15 ::=			SEQUENCE {
  bandNR-r15				FreqBandIndicatorNR-r15
}

FreqBandIndicatorNR-r15 ::=			INTEGER (1.. maxFBI-NR-r15)

UE Capability Info Indication

MN-eNB ➔ MME

TS 36.431

IE/Group Name Presence
Message Type M
MME UE S1AP ID M
eNB UE S1AP ID M
UE Radio Capability M
UE Radio Capability for Paging O
UE Application Layer Measurement Capability O
LTE-M Indication O

AS Security Mode Command

MN-eNB ➔ UE

TS 36.331

SecurityModeCommand ::= SEQUENCE {
  rrc-TransactionIdentifier RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
  c1 CHOICE{
    securityModeCommand-r8 SecurityModeCommand-r8-IEs,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture SEQUENCE {}
 }
}

SecurityModeCommand-r8-IEs ::=  SEQUENCE {
  securityConfigSMC SecurityConfigSMC,
  nonCriticalExtension SecurityModeCommand-v8a0-IEs  OPTIONAL
}

SecurityModeCommand-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension OCTET STRING OPTIONAL,
  nonCriticalExtension SEQUENCE {} OPTIONAL
}

SecurityConfigSMC ::= SEQUENCE {
  securityAlgorithmConfig SecurityAlgorithmConfig,
  ...
}

AS Security Mode Complete

UE ➔ MN-eNB

TS 36.331

SecurityModeComplete ::= SEQUENCE {
  rrc-TransactionIdentifier RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
    securityModeComplete-r8 SecurityModeComplete-r8-IEs,
    criticalExtensionsFuture SEQUENCE {}
  }
}

SecurityModeComplete-r8-IEs ::= SEQUENCE {
  nonCriticalExtension SecurityModeComplete-v8a0-IEs OPTIONAL
}

SecurityModeComplete-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension OCTET STRING OPTIONAL,
  nonCriticalExtension SEQUENCE {} OPTIONAL
}

RRC Connection Reconfiguration

MN-eNB ➔ UE

TS 36.331

When configuring the default bearer:

RRCConnectionReconfiguration ::=  SEQUENCE {
  rrc-TransactionIdentifier RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
  c1 CHOICE{
    rrcConnectionReconfiguration-r8 RRCConnectionReconfiguration-r8-IEs,
    spare7 NULL,
    spare6 NULL, spare5 NULL, spare4 NULL,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture SEQUENCE {}
  }
}

RRCConnectionReconfiguration-r8-IEs ::= SEQUENCE {
  measConfig MeasConfig OPTIONAL,  -- Need ON
  mobilityControlInfo MobilityControlInfo   OPTIONAL,  -- Cond HO
  dedicatedInfoNASList SEQUENCE (SIZE(1..maxDRB)) OF
  DedicatedInfoNAS OPTIONAL,  -- Cond nonHO
  radioResourceConfigDedicated  RadioResourceConfigDedicated  OPTIONAL, -- Cond HO-toEUTRA
  securityConfigHO SecurityConfigHO OPTIONAL,  -- Cond HO-toEPC
  nonCriticalExtension RRCConnectionReconfiguration-v890-IEs  OPTIONAL
}
/*---clipped----*/

MeasConfig

MeasConfig ::=						SEQUENCE {
	-- Measurement objects
	measObjectToRemoveList				MeasObjectToRemoveList				OPTIONAL,	-- Need ON
	measObjectToAddModList				MeasObjectToAddModList				OPTIONAL,	-- Need ON
	-- Reporting configurations
	reportConfigToRemoveList			ReportConfigToRemoveList			OPTIONAL,	-- Need ON
	reportConfigToAddModList			ReportConfigToAddModList			OPTIONAL,	-- Need ON
	-- Measurement identities
	measIdToRemoveList				MeasIdToRemoveList					OPTIONAL,	-- Need ON
	measIdToAddModList				MeasIdToAddModList					OPTIONAL,	-- Need ON
	-- Other parameters
	quantityConfig					QuantityConfig						OPTIONAL,	-- Need ON
	measGapConfig					MeasGapConfig						OPTIONAL,	-- Need ON
	s-Measure							RSRP-Range							OPTIONAL,	-- Need ON
	preRegistrationInfoHRPD				PreRegistrationInfoHRPD				OPTIONAL,	-- Need OP
	speedStatePars			CHOICE {
		release								NULL,
		setup								SEQUENCE {
			mobilityStateParameters				MobilityStateParameters,
			timeToTrigger-SF					SpeedStateScaleFactors
		}
	}
    /* ---- clipped ---- */
}

MeasObjectToAddModList

MeasObjectToAddModList ::=	SEQUENCE (SIZE (1..maxObjectId)) OF MeasObjectToAddMod

MeasObjectToAddMod ::=	SEQUENCE {
	measObjectId			MeasObjectId,
	measObject			CHOICE {
	    measObjectEUTRA		MeasObjectEUTRA,
	    measObjectUTRA		MeasObjectUTRA,
	    measObjectGERAN		MeasObjectGERAN,
	    measObjectCDMA2000	        MeasObjectCDMA2000,
	    ...,
	    measObjectWLAN-r13		MeasObjectWLAN-r13,
	    measObjectNR-r15		MeasObjectNR-r15
	}
}

MeasObjectNR-r15

The IE MeasObjectNR specifies information applicable for inter-RAT NR neighboring cells.

MeasObjectNR-r15 ::=			SEQUENCE {
	carrierFreq-r15				ARFCN-ValueNR-r15,
	rs-ConfigSSB-r15			RS-ConfigSSB-NR-r15,
	threshRS-Index-r15			ThresholdListNR-r15			OPTIONAL,		-- Need OR
	maxRS-IndexCellQual-r15			MaxRS-IndexCellQualNR-r15		OPTIONAL,		-- Need OR
	offsetFreq-r15				Q-OffsetRangeInterRAT		        DEFAULT 0,
	blackCellsToRemoveList-r15		CellIndexList				OPTIONAL,		-- Need ON
	blackCellsToAddModList-r15		CellsToAddModListNR-r15			OPTIONAL,		-- Need ON
	quantityConfigSet-r15			INTEGER (1.. maxQuantSetsNR-r15),
	cellsForWhichToReportSFTD-r15	SEQUENCE (SIZE (1..maxCellSFTD)) OF PhysCellIdNR-r15	OPTIONAL,	-- Need OR
	...,
	[[	cellForWhichToReportCGI-r15	PhysCellIdNR-r15			OPTIONAL,	-- Need ON
		deriveSSB-IndexFromCell-r15	BOOLEAN					OPTIONAL,	-- Need ON
		ss-RSSI-Measurement-r15		SS-RSSI-Measurement-r15			OPTIONAL,	-- Need ON
		bandNR-r15			CHOICE {
			                        release	NULL,
			                        setup FreqBandIndicatorNR-r15
		                                }					OPTIONAL	-- Need ON
	]]
}

RS-ConfigSSB-NR-r15 ::=			SEQUENCE {
	measTimingConfig-r15		MTC-SSB-NR-r15,

	subcarrierSpacingSSB-r15	ENUMERATED {kHz15, kHz30, kHz120, kHz240},
	...
}

CellsToAddModListNR-r15 ::=		SEQUENCE (SIZE (1..maxCellMeas)) OF CellsToAddModNR-r15

CellsToAddModNR-r15 ::=			SEQUENCE {
	cellIndex-r15			INTEGER (1..maxCellMeas),
	physCellId-r15			PhysCellIdNR-r15
}

RRC Connection Reconfiguration Complete

UE ➔ MN-eNB

TS 36.331

RRCConnectionSetupComplete ::=  SEQUENCE {
  rrc-TransactionIdentifier  RRC-TransactionIdentifier,
  criticalExtensions  CHOICE {
  c1  CHOICE{
    rrcConnectionSetupComplete-r8  RRCConnectionSetupComplete-r8-IEs,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture  SEQUENCE {}
  }
}

RRCConnectionSetupComplete-r8-IEs ::= SEQUENCE {
  selectedPLMN-Identity  INTEGER (1..maxPLMN-r11),
  registeredMME  RegisteredMME  OPTIONAL,
  dedicatedInfoNAS  DedicatedInfoNAS,
  nonCriticalExtension  RRCConnectionSetupComplete-v8a0-IEs  OPTIONAL
}

RRCConnectionSetupComplete-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension  OCTET STRING  OPTIONAL,
  nonCriticalExtension  RRCConnectionSetupComplete-v1020-IEs  OPTIONAL
}

RRCConnectionSetupComplete-v1020-IEs ::= SEQUENCE {
  gummei-Type-r10  ENUMERATED {native, mapped}  OPTIONAL,
  rlf-InfoAvailable-r10  ENUMERATED {true}  OPTIONAL,
  logMeasAvailable-r10  ENUMERATED {true}  OPTIONAL,
  rn-SubframeConfigReq-r10  ENUMERATED {required, notRequired}  OPTIONAL,
  nonCriticalExtension  RRCConnectionSetupComplete-v1130-IEs  OPTIONAL
}
/*----clipped----*/

Initial Context Setup Response

MN-eNB ➔ MME

TS 36.413

IE/Group Name Presence
Message Type M
MME UE S1AP ID M
eNB UE S1AP ID M
E-RAB Setup List

E-RAB Setup Item IEs [E-RAB ID]

IE/Group Name Presence
E-RAB ID M
Transport Layer Address M
GTP-TEID M
E-RAB Failed to Setup List O
Criticality Diagnostics O

Attach Complete

UE ➔ MME

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
Security header type Security header type M
Attach complete message identity Message type M
ESM message container - Activate Default EPS Bearer Accept ESM message container M

Activate Default EPS Bearer Accept

UE ➔ MME

TS 24.301

Information Element Type Presence
Protocol discriminator Protocol discriminator M
EPS bearer identity EPS bearer identity M
Procedure transaction identity Procedure transaction identity M
Activate default EPS bearer context accept message identity Message type M
Protocol configuration options Protocol configuration options O
Extended protocol configuration options Extended protocol configuration options O

Measurement Report

UE ➔ MN-eNB

TS 36.331

MeasurementReport ::= SEQUENCE {
  criticalExtensions  CHOICE {
  c1 CHOICE{
    measurementReport-r8 MeasurementReport-r8-IEs,
    spare7 NULL,
    spare6 NULL, spare5 NULL, spare4 NULL,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture    SEQUENCE {}
 }
}

MeasurementReport-r8-IEs ::= SEQUENCE {
  measResults MeasResults,
  nonCriticalExtension MeasurementReport-v8a0-IEs OPTIONAL
}

MeasurementReport-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension    OCTET STRING    OPTIONAL,
  nonCriticalExtension SEQUENCE {} OPTIONAL
}

MeasResults

MeasResults ::=  SEQUENCE {
  measId  MeasId,
  measResultPCell  SEQUENCE {
  rsrpResult    RSRP-Range,
  rsrqResult    RSRQ-Range
  },
  measResultNeighCells  CHOICE {
  ...,
  measResultNeighCellListNR-r15   MeasResultCellListNR-r15
} 

MeasResultCellListNR-r15::=  SEQUENCE (SIZE (1..maxCellReport)) OF MeasResultCellNR-r15

MeasResultCellNR-r15 ::=    SEQUENCE {
  pci-r15  PhysCellIdNR-r15,
  measResultCell-r15    MeasResultNR-r15,
  measResultRS-IndexList-r15    MeasResultSSB-IndexList-r15  OPTIONAL,
  ...,
  [[  cgi-Info-r15  CGI-InfoNR-r15  OPTIONAL
  ]]
}

MeasResultNR-r15 ::=  SEQUENCE {
  rsrpResult-r15  RSRP-RangeNR-r15  OPTIONAL,
  rsrqResult-r15  RSRQ-RangeNR-r15  OPTIONAL,
  rs-sinr-Result-r15    RS-SINR-RangeNR-r15  OPTIONAL,
  ...
}

SgNB Addition Request

MN-eNB ➔ SN-gNB

TS 36.423

IE/Group Name Presence
Message Type M
MeNB UE X2AP ID M
NR UE Security Capabilities M
SgNB Security Key M
SgNB UE Aggregate Maximum Bit Rate M
Selected PLMN O
Handover Restriction List O
E-RABs To Be Added List

E-RABs To Be Added Item [E-RAB ID]

IE/Group Name Presence
E-RAB ID M
DRB ID M
EN-DC Resource Configuration M
CHOICE Resource Configuration M

PDCP present in SN

IE/Group Name Presence
Full E-RAB Level QoS Parameters M
Maximum MCG admittable E-RAB Level QoS Parameters C-ifCGandSCGpresent_GBR
DL Forwarding O
MeNB DL GTP TEID at MCG C-ifMCGpresent
S1 UL GTP Tunnel Endpoint M
RLC Mode O

PDCP not present in SN

IE/Group Name Presence
Requested SCG E-RAB Level QoS Parameters M
MeNB UL GTP TEID at PDCP M
Secondary MeNB UL GTP TEID at PDCP O
RLC Mode M
UL configuration C-ifMCGandSCGpresent
UL PDCP SN Length O
DL PDCP SN Length O
Duplication activation O
IE/Group Name Presence
MeNB to SgNB Container M
SgNB UE X2AP ID O
Expected UE Behaviour O
MeNB UE X2AP ID Extension O
Requested split SRBs O
MeNB Resource Coordination Information O
SGNB Addition Trigger Indication O
Subscriber Profile ID for RAT/Frequency priority O
MeNB Cell ID M

SgNB Addition Request Acknowledge

SN-gNB ➔ MN-eNB

TS 36.423

Nested payload::

Container Payload
SgNB to MeNB Container CG-Config
IE/Group Name Presence
Message Type M
MeNB UE X2AP ID M
SgNB UE X2AP ID M
E-RABs Admitted To Be Added List

E-RABs Admitted To Be Added Item [E-RAB ID]

IE/Group Name Presence
E-RAB ID M
EN-DC Resource Configuration M
CHOICE Resource Configuration M

PDCP present in SN

IE/Group Name Presence
S1 DL GTP TEID at the SgNB M
SgNB UL GTP TEID at PDCP C-ifMCGpresent
RLC Mode C-ifMCGpresent
DL Forwarding GTP Tunnel Endpoint O
UL Forwarding GTP Tunnel Endpoint O
Requested MCG E-RAB Level QoS Parameters C-ifMCGandSCGpresent_GBRpresent
UL configuration C-ifMCGandSCGpresent
UL PDCP SN Length O
DL PDCP SN Length O

PDCP not present in SN

IE/Group Name Presence
SgNB DL GTP TEID at SCG M
Secondary SgNB DL GTP TEID at SCG O
LCID O
IE/Group Name Presence
E-RABs Not Admitted List O
SgNB to MeNB Container - CG-Config M
Criticality Diagnostics O
MeNB UE X2AP ID Extension O
Admitted split SRBs O
SgNB Resource Coordination Information O
RRC config indication O

CG-Config

CG-Config ::=                   SEQUENCE {
    criticalExtensions                  CHOICE {
        c1                                  CHOICE{
            cg-Config                   CG-Config-IEs,
            spare3 NULL, spare2 NULL, spare1 NULL
        },
        criticalExtensionsFuture            SEQUENCE {}
    }
}

CG-Config-IEs ::=           SEQUENCE {
    scg-CellGroupConfig                 OCTET STRING (CONTAINING RRCReconfiguration)    OPTIONAL,
    scg-RB-Config                       OCTET STRING (CONTAINING RadioBearerConfig)     OPTIONAL,
    configRestrictModReq                ConfigRestrictModReqSCG                         OPTIONAL,
    drx-InfoSCG                         DRX-Info                                        OPTIONAL,
    candidateCellInfoListSN             OCTET STRING (CONTAINING MeasResultList2NR)     OPTIONAL,
    measConfigSN                        MeasConfigSN                                    OPTIONAL,
    selectedBandCombinationNR           BandCombinationInfoSN 
    fr-InfoListSCG                      FR-InfoList                                     OPTIONAL,
    candidateServingFreqListNR          CandidateServingFreqListNR                      OPTIONAL,
    nonCriticalExtension                CG-Config-v1540-IEs                             OPTIONAL
}

CG-Config-v1540-IEs ::= SEQUENCE {
    pSCellFrequency                     ARFCN-ValueNR                                   OPTIONAL,
    reportCGI-Request                   SEQUENCE {
        requestedCellInfo                   SEQUENCE {
            ssbFrequency                        ARFCN-ValueNR,
            cellForWhichToReportCGI             PhysCellId
        }                                                                               OPTIONAL
    }                                                                                   OPTIONAL,
    ph-InfoSCG                          PH-TypeListSCG                                  OPTIONAL,
    nonCriticalExtension                SEQUENCE {}                                     OPTIONAL
}

PH-TypeListSCG ::=                      SEQUENCE (SIZE (1..maxNrofServingCells)) OF PH-InfoSCG

PH-InfoSCG ::=                          SEQUENCE {
    servCellIndex                       ServCellIndex,
    ph-Uplink                           PH-UplinkCarrierSCG,
    ph-SupplementaryUplink              PH-UplinkCarrierSCG                             OPTIONAL,
    ...
}

PH-UplinkCarrierSCG ::=                 SEQUENCE{
    ph-Type1or3                             ENUMERATED {type1, type3},
    ...
}

MeasConfigSN ::= SEQUENCE {
    measuredFrequenciesSN               SEQUENCE (SIZE (1..maxMeasFreqsSN)) OF NR-FreqInfo  OPTIONAL,
    ...
}

NR-FreqInfo ::= SEQUENCE {
    measuredFrequency                   ARFCN-ValueNR                                       OPTIONAL,
    ...
}

ConfigRestrictModReqSCG ::=         SEQUENCE {
    requestedBC-MRDC                    BandCombinationInfoSN                               OPTIONAL,
    requestedP-MaxFR1               P-Max                                                   OPTIONAL,
    ...
}

BandCombinationIndex ::= INTEGER (1..maxBandComb)

BandCombinationInfoSN ::=   SEQUENCE {
    bandCombinationIndex       BandCombinationIndex,
    requestedFeatureSets       FeatureSetEntryIndex
}


FR-InfoList ::=	SEQUENCE (SIZE (1..maxNrofServingCells-1)) OF FR-Info

FR-Info ::=	SEQUENCE {
    servCellIndex       ServCellIndex,
    fr-Type             ENUMERATED {fr1, fr2}
}

CandidateServingFreqListNR ::= SEQUENCE (SIZE (1.. maxFreqIDC-MRDC)) OF ARFCN-ValueNR

RRC Connection Reconfiguration for 5G-NR Bearer

MN-eNB ➔ UE

TS 36.331

Nested payload::

Container Payload
nr-SecondaryCellGroupConfig-r15 CG-Config 
RRCConnectionReconfiguration ::=  SEQUENCE {
  rrc-TransactionIdentifier RRC-TransactionIdentifier,
  criticalExtensions CHOICE {
  c1 CHOICE{
    rrcConnectionReconfiguration-r8 RRCConnectionReconfiguration-r8-IEs,
    spare7 NULL,
    spare6 NULL, spare5 NULL, spare4 NULL,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture SEQUENCE {}
  }
}

RRCConnectionReconfiguration-r8-IEs ::= SEQUENCE {
  measConfig MeasConfig OPTIONAL,  -- Need ON
  mobilityControlInfo MobilityControlInfo   OPTIONAL,  -- Cond HO
  dedicatedInfoNASList SEQUENCE (SIZE(1..maxDRB)) OF
  DedicatedInfoNAS OPTIONAL,  -- Cond nonHO
  radioResourceConfigDedicated  RadioResourceConfigDedicated  OPTIONAL, -- Cond HO-toEUTRA
  securityConfigHO SecurityConfigHO OPTIONAL,  -- Cond HO-toEPC
  nonCriticalExtension RRCConnectionReconfiguration-v890-IEs  OPTIONAL
}
/*---clipped----*/

5G NR Information Elements

RRCConnectionReconfiguration-v1510-IEs ::= SEQUENCE {
  nr-Config-r15 CHOICE {
    release NULL,
    setup SEQUENCE {
      endc-ReleaseAndAdd-r15  BOOLEAN,
      nr-SecondaryCellGroupConfig-r15 OCTET STRING OPTIONAL, -- Need ON /* Contains cg-Config */
      p-MaxEUTRA-r15 P-Max OPTIONAL -- Need ON
    }
  } OPTIONAL, -- Need ON
  sk-Counter-r15 INTEGER (0.. 65535) OPTIONAL, -- Need ON
  nr-RadioBearerConfig1-r15 OCTET STRING OPTIONAL, -- Need ON
  nr-RadioBearerConfig2-r15 OCTET STRING OPTIONAL, -- Need ON
  tdm-PatternConfig-r15 CHOICE {
    release NULL,
    setup SEQUENCE {
      subframeAssignment-r15 SubframeAssignment-r15,
      harq-Offset-r15 INTEGER (0.. 9)
    }
  } OPTIONAL, -- Cond FDD-PCell
  nonCriticalExtension RRCConnectionReconfiguration-v1530-IEs OPTIONAL
}

RRCConnectionReconfiguration-v1530-IEs ::= SEQUENCE {
  securityConfigHO-v1530  SecurityConfigHO-v1530 OPTIONAL,  -- Cond HO-5GC
  sCellGroupToReleaseList-r15 SCellGroupToReleaseList-r15 OPTIONAL, -- Need ON
  sCellGroupToAddModList-r15  SCellGroupToAddModList-r15  OPTIONAL, -- Need ON
  dedicatedInfoNASList-r15  SEQUENCE (SIZE(1..maxDRB-r15)) OF
  DedicatedInfoNAS OPTIONAL,  -- Cond nonHO
  p-MaxUE-FR1-r15 P-Max OPTIONAL, -- Need OR
  smtc-r15 MTC-SSB-NR-r15 OPTIONAL, -- Need OP
  nonCriticalExtension SEQUENCE {} OPTIONAL
}

SCellGroupToAddModList-r15 ::=  SEQUENCE (SIZE (1..maxSCellGroups-r15)) OF SCellGroupToAddMod-r15

SCellGroupToAddMod-r15 ::= SEQUENCE {
  sCellGroupIndex-r15 SCellGroupIndex-r15,
  sCellConfigCommon-r15 SCellConfigCommon-r15 OPTIONAL, -- Need ON
  sCellToReleaseList-r15 SCellToReleaseListExt-r13 OPTIONAL,  -- Need ON
  sCellToAddModList-r15 SCellToAddModListExt-r13 OPTIONAL -- Need ON
}

SCellGroupIndex-r15 ::= INTEGER (1..maxSCellGroups-r15)

SCellConfigCommon-r15 ::= SEQUENCE {
  radioResourceConfigCommonSCell-r15 RadioResourceConfigCommonSCell-r10 OPTIONAL, -- Need ON
  radioResourceConfigDedicatedSCell-r15 RadioResourceConfigDedicatedSCell-r10  OPTIONAL,-- Need ON
  antennaInfoDedicatedSCell-r15 AntennaInfoDedicated-v10i0 OPTIONAL -- Need ON
}

SecurityConfigHO-v1530 ::= SEQUENCE {
  handoverType-v1530 CHOICE {
  intra5GC-r15 SEQUENCE {
  securityAlgorithmConfig-r15 SecurityAlgorithmConfig OPTIONAL, -- Cond fullConfig
  keyChangeIndicator-r15 BOOLEAN,
  nextHopChainingCount-r15 NextHopChainingCount,
  nas-Container-r15 OCTET STRING OPTIONAL -- Need ON
 },
  fivegc-ToEPC-r15  SEQUENCE {
  securityAlgorithmConfig-r15 SecurityAlgorithmConfig,
  nextHopChainingCount-r15 NextHopChainingCount
 },
 epc-To5GC-r15  SEQUENCE {
  securityAlgorithmConfig-r15 SecurityAlgorithmConfig,
  nas-Container-r15  OCTET STRING
 }
},
  ...
}

RRC Connection Reconfiguration Complete for 5G-NR Bearer

UE ➔ MN-eNB

Nested payload:

Container Payload
scg-ConfigResponseNR-r15 NR RRCReconfigurationComplete

TS 36.331

RRCConnectionSetupComplete ::=  SEQUENCE {
  rrc-TransactionIdentifier  RRC-TransactionIdentifier,
  criticalExtensions  CHOICE {
  c1  CHOICE{
    rrcConnectionSetupComplete-r8  RRCConnectionSetupComplete-r8-IEs,
    spare3 NULL, spare2 NULL, spare1 NULL
  },
  criticalExtensionsFuture  SEQUENCE {}
  }
}

RRCConnectionSetupComplete-r8-IEs ::= SEQUENCE {
  selectedPLMN-Identity  INTEGER (1..maxPLMN-r11),
  registeredMME  RegisteredMME  OPTIONAL,
  dedicatedInfoNAS  DedicatedInfoNAS,
  nonCriticalExtension  RRCConnectionSetupComplete-v8a0-IEs  OPTIONAL
}

RRCConnectionSetupComplete-v8a0-IEs ::= SEQUENCE {
  lateNonCriticalExtension  OCTET STRING  OPTIONAL,
  nonCriticalExtension  RRCConnectionSetupComplete-v1020-IEs  OPTIONAL
}

RRCConnectionSetupComplete-v1020-IEs ::= SEQUENCE {
  gummei-Type-r10  ENUMERATED {native, mapped}  OPTIONAL,
  rlf-InfoAvailable-r10  ENUMERATED {true}  OPTIONAL,
  logMeasAvailable-r10  ENUMERATED {true}  OPTIONAL,
  rn-SubframeConfigReq-r10  ENUMERATED {required, notRequired}  OPTIONAL,
  nonCriticalExtension  RRCConnectionSetupComplete-v1130-IEs  OPTIONAL
}
/*----clipped----*/

RRCConnectionReconfigurationComplete-v1510-IEs ::= SEQUENCE {
  scg-ConfigResponseNR-r15 OCTET STRING  OPTIONAL, /* Contains the NR RRCReconfigurationComplete */
  nonCriticalExtension  RRCConnectionReconfigurationComplete-v1530-IEs OPTIONAL
}

RRCConnectionReconfigurationComplete-v1530-IEs ::= SEQUENCE {
  logMeasAvailableBT-r15  ENUMERATED {true}  OPTIONAL,
  logMeasAvailableWLAN-r15 ENUMERATED {true}  OPTIONAL,
  flightPathInfoAvailable-r15 ENUMERATED {true}   OPTIONAL,
  nonCriticalExtension  SEQUENCE {} OPTIONAL
}

NR RRCReconfigurationComplete

TS 38.331

RRCReconfigurationComplete ::=              SEQUENCE {
    rrc-TransactionIdentifier                   RRC-TransactionIdentifier,
    criticalExtensions                          CHOICE {
        rrcReconfigurationComplete                  RRCReconfigurationComplete-IEs,
        criticalExtensionsFuture                    SEQUENCE {}
    }
}

RRCReconfigurationComplete-IEs ::=          SEQUENCE {
    lateNonCriticalExtension                    OCTET STRING                            OPTIONAL,
    nonCriticalExtension                        RRCReconfigurationComplete-v1530-IEs    OPTIONAL
}

RRCReconfigurationComplete-v1530-IEs ::=    SEQUENCE {
    uplinkTxDirectCurrentList                   UplinkTxDirectCurrentList               OPTIONAL,
    nonCriticalExtension                        SEQUENCE {}                             OPTIONAL
}

SgNB Reconfiguration Complete

MN-eNB ➔ SN-gNB

TS 36.423

Nested payload::

Container Payload
MeNB to SgNB Container NR RRCReconfigurationComplete
IE/Group Name Presence
Message Type M
MeNB UE X2AP ID M
SgNB UE X2AP ID M
Response Information M

CHOICE Response Type

Configuration successfully applied

IE/Group Name Presence
MeNB to SgNB Container - NR RRCReconfigurationComplete O

Configuration rejected

IE/Group Name Presence
Cause M
IE/Group Name Presence
MeNB UE X2AP ID Extension O

SN Status Transfer

MN-eNB ➔ SN-gNB

TS 36.423

IE/Group Name Presence
Message Type M
Old eNB UE X2AP ID M
New eNB UE X2AP ID M
E-RABs Subject To Status Transfer List

E-RABs Subject To Status Transfer Item [E-RAB ID]

IE/Group Name Presence
E-RAB ID M
Receive Status Of UL PDCP SDUs O
UL COUNT Value M
DL COUNT Value M
Receive Status Of UL PDCP SDUs Extended O
UL COUNT Value Extended O
DL COUNT Value Extended O
Receive Status Of UL PDCP SDUs for PDCP SN Length 18 O
UL COUNT Value for PDCP SN Length 18 O
DL COUNT Value for PDCP SN Length 18 O
IE/Group Name Presence
Old eNB UE X2AP ID Extension O
New eNB UE X2AP ID Extension O
SgNB UE X2AP ID O

SS/PBCH Block

SN-gNB ➔ UE

TS 38.211

NR PSS

SN-gNB ➔ UE

The Primary Synchronization Signal (PSS) is used for radio frame level synchronization. The PSS is a Linear Feedback Shift Register sequence that is designed to provide a long non-repeating sequence.

NR SSS

The Secondary Synchronization Signal (SSS) is used to subframe synchronization.

NR PBCH

MIB ::=                             SEQUENCE {
    systemFrameNumber                   BIT STRING (SIZE (6)),
    subCarrierSpacingCommon             ENUMERATED {scs15or60, scs30or120},
    ssb-SubcarrierOffset                INTEGER (0..15),
    dmrs-TypeA-Position                 ENUMERATED {pos2, pos3},
    pdcch-ConfigSIB1                    PDCCH-ConfigSIB1,
    cellBarred                          ENUMERATED {barred, notBarred},
    intraFreqReselection                ENUMERATED {allowed, notAllowed},
    spare                               BIT STRING (SIZE (1))
}

Resources for SS/PBCH Block

Signal OFDM symbol number relative to the start of an SS/PBCH block Subcarrier number relative to the start of an SS/PBCH block
PSS 0 56, 57, …, 182
SSS 2 56, 57, …, 182
PBCH 1, 3 0, 1, …, 239
PBCH 2 0, 1, …, 47, 192, 193, …, 239

NR Preamble

UE ➔ gNB

TS 38.213, TS 38.321, TS 38.211

The UE picks a random preamble. The preamble is referenced with the Random Access Preamble Id (RAPID). The preamble transmission is a Zadoff-Chu sequence.

Each preamble transmission is associated with an RA-RNTI.

NR RA-RNTI

The RA-RNTI associated with the PRACH in which the Random Access Preamble is transmitted, is computed as:

RA-RNTI= 1 + s_id + 14 × t_id + 14 × 80 × f_id + 14 × 80 × 8 × ul_carrier_id

Where:

Identifier Description
s_id Index of the first OFDM symbol of the specified PRACH (0 ≤ s_id < 14)
t_id Index of the first slot of the specified PRACH in a system frame (0 ≤ t_id < 80)
f_id Index of the specified PRACH in the frequency domain (0 ≤ f_id < 8)
ul_carrier_id Uplink carrier used for Msg1 transmission (0 for NUL carrier, and 1 for SUL carrier)

PDCCH DCI Format 1_0

gNB ➔ UE

TS 38.212

DCI Format 1_0 is used to assign downlink resources.

Format 1_0 - CRC Scrambled with RA-RNTI

In response to a PRACH transmission, a UE attempts to detect a DCI Format 1_0 with PDCCH CRC scrambled by
the RA-RNTI corresponding to the RACH transmission. The UE looks for message during a configured window of length ra-ResponseWindow.

The RA-RNTI scrambled DCI message signals the frequency and time resources assigned for the transmission of the Transport Block containing the Random Access Response message.

The following information is transmitted by means of the RA-RNTI scrambled DCI Format 1_0:

Field Bits
Frequency domain resource assignment ⌈log2(NRBDL,BWP(NRBDL,BWP + 1)/2)⌉
NRBDL,BWP is the size of CORESET 0
Time domain resource assignment 4
VRB-to-PRB mapping 1
Modulation and coding scheme 5
TB scaling 2
Reserved bits 16

Format 1_0 - CRC Scrambled with C-RNTI

The following information is transmitted by a DCI Format 1_0 with PDCCH CRC scrambled by the assigned C-RNTI:

Field Bits
Identifier of DCI formats 1
Frequency domain resource assignment ⌈log2(NRBDL,BWP(NRBDL,BWP + 1)/2)⌉
NRBDL,BWP is the size of the active DL bandwidth part in case DCI format 1_0
is monitored in the UE specific search space if DCH sizes <= 4 and DCI size with
C-RNTI <= 3. Otherwise NRBDL,BWP is the size of CORESET 0
Time domain resource assignment 4
VRB-to-PRB mapping 1
Modulation and coding scheme 5
New data indicator 1
Redundancy version 2
HARQ process number 4
Downlink assignment index 2
TPC command for scheduled PUCCH 2
PUCCH resource indicator 3
PDSCH-to-HARQ_feedback timing indicator 3

NR Random Access Response

gNB ➔ UE

TS 38.213, TS 38.321

  1. The UE listens on the PDCCH addressed by the RA-RNTI.
  2. Once the PDCCH with the RA-RNTI is decoded, the UE uses the RB resources in the message to receive the downlink transport block.
  3. The downlink transport block contains the MAC PDU.

NR RAR MAC PDU

subPDU 1 bit 1 bit 6-bit MAC subPDU payload
MAC subPDU 1 E T RAPID 1 MAC payload for Random Access Response
MAC subPDU 2 E T RAPID 2 MAC payload for Random Access Response
MAC subPDU 3 E T RAPID 3 MAC payload for Random Access Response
⋮
MAC subPDU n
Padding (optional)

NR E/T/RAPID MAC subheader

1 bit 1 bit 6-bit
E T RAPID

NR MAC Payload for Random Access Response

Field Description Bits
R Reserved bit (set to "0") 1
Timing Advance Command The Timing Advance Command field indicates the index value TA used to control the amount of timing adjustment that the MAC entity must apply in TS 38.213. 12
RAR UL Grant The Uplink Grant field indicates the resources to be used on the uplink in TS 38.213 27
Temporary C-RNTI The Temporary C-RNTI field indicates the temporary identity that is used by the MAC entity during Random Access. 16

NR RAR UL Grant

RAR grant field Number of bits
Frequency hopping flag 1
Msg3 PUSCH frequency resource allocation 14
Msg3 PUSCH time resource allocation 4
MCS 4
TPC command for Msg3 PUSCH 3
CSI request 1

NR MAC PDU

SN-gNB ➔ UE

UE ➔ SN-gNB

TS 38.321

subPDU 1 bit 1 bit 6-bit Length MAC subPDU payload
MAC subPDU 1 R F LCID 2 byte Payload
MAC subPDU 2 R F LCID 1 byte Payload
⋮
MAC subPDU n
Padding (optional)

PDCCH DCI Format 0_0

gNB ➔ UE

TS 38.212

DCI Format 0_0 is used to assign uplink resources to the UE.

Format 0_0 - CRC Scrambled with C-RNTI

The following information is transmitted by a DCI Format 0_0 with PDCCH CRC scrambled by the assigned C-RNTI:

Field Bits
Identifier of DCI formats 1
Frequency domain resource assignment ⌈log2(NRBUL,BWP(NRBUL,BWP + 1)/2)⌉
NRBUL,BWP is the size of the active UL bandwidth part in case DCI format 0_0 is monitored in the UE specific search space if DCH sizes <= 4 and DCI size with C-RNTI <= 3. Otherwise NRBUL,BWP is the size of the initial UL bandwidth part.
Time domain resource assignment 4
Frequency hopping flag 1
Modulation and coding scheme 5
New data indicator 1
Redundancy version 2
HARQ process number 4
Downlink assignment index 2
TPC command for scheduled PUSCH 2
UL/SUL indicator 1

Dual Connectivity PHR MAC CE
C7 C6 C5 C4 C3 C2 C1 R
C15 C14 C13 C12 C11 C10 C9 C8
C23 C22 C21 C20 C19 C18 C17 C16
C31 C30 C29 C28 C27 C26 C25 C24
P V PH (Type 2, PCell)
R R PCMAX,c 1
P V PH (Type 2, PSCell)
R R PCMAX,c 2
P V PH (Type 1, PCell)
R R PCMAX,c 3
P V PH (Type x, Serving Cell 1)
R R PCMAX,c 4
... ... ...
... ... ...
P V PH (Type x, Serving Cell n)
R R PCMAX,c m

RRC Transfer

IE/Group Name Presence
Message Type M
MeNB UE X2AP ID M
SgNB UE X2AP ID M

split SRB

IE/Group Name Presence
RRC Container O
SRB Type M
Delivery status O

NR UE Report

IE/Group Name Presence
RRC Container M
IE/Group Name Presence
MeNB UE X2AP ID Extension O

Secondary RAT Data Usage Report

SN-gNB ➔ MN-eNB

TS 36.423

IE/Group Name Presence
Message Type M
MeNB UE X2AP ID M
SgNB UE X2AP ID M
Secondary RAT Usage Report list M
MeNB UE X2AP ID Extension O

Secondary RAT Usage Report List

TS 36.423

This IE provides information on the NR resources used with EN-DC.

Secondary RAT Usage Report List

Secondary RAT usage report Item [Bearer Id]

IE/Group Name Presence
E-RAB ID M
Secondary RAT Type M
E-RAB Usage Report List

E-RAB Usage Report Item [Start Time:End Time]

IE/Group Name Presence
Start timestamp M
End timestamp M
Usage count UL M
Usage count DL M

gNB Status Indication

SN-gNB ➔ MN-eNB

TS 36.423

IE/Group Name Presence Value
Message Type M
gNB Overload Information M Enum:
  • overloaded
  • not-overloaded

5G specifications

Specification Version Description
TS 38.211 V15.4.0 (2018-12) NR; Physical channels and modulation
TS 38.212 V15.3.0 (2018-09) NR; Multiplexing and channel coding
TS 38.213 V15.3.0 (2018-09) NR; Physical layer procedures for control
TS 38.321 V15.3.0 (2018-09) NR; Medium Access Control (MAC) protocol specification
TS 38.331 V15.4.0 (2018-12) NR; Radio Resource Control (RRC); Protocol specification

4G specifications

Specification Version Description
TS 24.301 V15.5.0 (2018-12) Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)
TS 36.211 V15.3.0 (2018-09) E-UTRA; Physical channels and modulation
TS 36.212 V15.3.0 (2018-09) E-UTRA; Multiplexing and channel coding
TS 36.213 V15.3.0 (2018-09) E-UTRA; Physical layer procedures
TS 36.321 V15.4.0 (2018-12) E-UTRA; Medium Access Control (MAC) protocol specification
TS 36.331 V15.4.0 (2018-12) E-UTRA; Radio Resource Control (RRC); Protocol specification
TS 36.413 V15.4.0 (2018-12) E-UTRA; S1 Application Protocol (S1AP); Protocol specification
TS 37.340 V15.4.0 (2018-12) E-UTRA and NR; Multi connectivity; Stage 2