1-NSA Basical Precedure Introduction -trainning 5G RADIO FREQUENCY EMERSON EDUARDO RODRIGUES.pptx

HUAWEI TECHNOLOGIES CO., LTD.
NSA Basical Procedure Introduction
(including NSA mobility)
EMERSON EDUARDO RODRIGUES

HISILICON SEMICONDUCTOR
HUAWEI TECHNOLOGIES CO., LTD. Page 2
Confidential
 After completing this course, you will be able to understand the basic principles, the NSA
anchoring preferred selection policy, the procedure of SCG addition, SCG deletion, SgNB
change, MeNB handover, also be familiar with some key parameter configuration.
Objectives

Confidential
Content
 1. NSA Introduction
 2. EN-DC Carrier Management
 3. NSA Mobility Management
 4. NSA Related Key Parameter
 5. Q&A

Confidential
NSA Architecture-Option3/3X
EPC
eNodeB gNodeB
UE
S1
X2
Uu Uu
EPC
eNodeB gNodeB
UE
S1-C
X2
S1-U
Uu Uu
MCG Split Bearer
Option3X
Option3
SCG Split Bearer
• The user plane is anchored on the LTE
side, reducing service interruption and
EPC signaling impact caused by user
movement.
• High requirements on LTE processing
capability and hardware upgrade
• Smooth evolution of existing LTE
devices to support NSA DC
• The user plane anchor is on the NR side,
and the gNodeB is connected to the LTE
EPC by SI-U interface.
For LTE- NR DC, Huawei currently focus on Option 3/3x NSA deployment.
CELLQCIPARA：NsaDcDefaultBeare

Confidential
Page 5
Abbreviation
DC（Dual Connection）：Dual connection, indicate that the UE is configured with a primary cell and secondary group under connection
mode
MR-DC ：Multi-RAT Dual Connectivity, including EN-DC, NE-DC, and NGEN-DC
MeNB ：Master eNB
SgNB ：Secondary gNodeB, The MeNB configures the NR base station for the NSA DC terminal by using RRC signaling, In this version, only
the NR base station can be set to the SgNB.
Pcell：Primary Cell, Primary cell of the MeNB, which is a cell where the NSA DC terminal camps.
PSCell：Primary Secondary Cell，the primary cell of the SgNB
Scell：Secondary Cell
Cell Group： in DC，A group of serving cells on the MeNB or the SeNB.
MCG：Master Cell Group,
SCG：Secondary Cell Group

Confidential
Page 6
EN-DC Mobility Overview
 Mobility Overview
① NSA UE access is the same as LTE UE
access.
② The eNodeB delivers event B1
measurement configuration to add a cell
served by the secondary gNodeB.
③ The eNodeB determines whether to use the
Option 3 or Option 3X architecture.
Mobility Trigger Scenario
Secondary Node Addition
The eNodeB periodically adds an SgNB based on data volume after initial access, incoming
handovers, or RRC connection re-establishments of UEs, or initial addition failures.
Secondary Node Modification/Change
Secondary Node Modification: intra-gNodeB intra-frequency handover
Secondary Node Change: inter-gNodeB intra-frequency handover
Secondary Node Release A2 conditions or RLC retransmissions in outgoing gNodeB coverage exceed specified thresholds
Master Node handover with/without Secondary
Node change
Intra-eNodeB/Inter-eNodeB intra-frequency/inter-frequency handover based on event A3/A4
Intra-eNodeB handover with SgNB and inter-eNodeB handover with SgNB are supported.

Confidential
Content
 4. NSA Key Parameter
 5. Q&A

Confidential
NSA DC Independent Anchor Select Solution
This feature enables NSA UEs to enjoy 5G services at anchor points as much as possible, improving user
experience.
1. NSA UEs are reselected or handed over to the anchor frequency as much as possible.
2. Avoid outgoing handovers to non-anchor sites.
3. Reduce handovers between anchor sites as much as possible.
Purpose of the parameter policy :

Confidential
NSA DC Independent Anchor Selection (Idle-RRC Release with IMMCI)
 When the NSA UE enters the idle mode after the first access release, the dedicated anchor priority can be delivered by running the IMMCI
(IdleModeMobilityControlInfo) IE.
NSA UE
LTE only UE
1. During the RRC Connection Release procedure, the anchor priority (dedicated priority) of each LTE frequency is carried in the IMMCI IE of the NSA UE.
2. After receiving the dedicated priority, the UE performs cell reselection based on the dedicated priority (F2 is preferred) and selects the LTE frequency with the highest priority
for camping.
3. Dedicated priorities are delivered in each RRC Connection Release. If the UE does not initiate any connection before the T320 timer expires (3 hours by default), the dedicated
priorities are invalid and the UE reselects a cell based on the common priorities (F1 is preferred).
NSA UE eNodeB
• The camping policy
in idle mode is the
same as that for
legacy UEs.
First connection
(Attach/TAU/……)
• The eNodeB determines whether to
support NSA DC based on UE
capabilities.
• For NSA UEs, the dedicated priority is
delivered through the IMMCI IE.
RRC connection release with IMMCI
• After the first RRC connection release, the UE is reselected to
F2 based on the dedicated priority.
3GPP TS 36.331 IMMCI (IdleModeMobilityControlInfo) in RRC Release:
• The NSA UE selects F1 during the first cell reselection
based on the common priority.
High
Low
LTE
Common Priority
High
Low
NSA
Dedicated Priority
• Reselection to F2 based on
the priority in IMMCI
F1
F2
When the NSA_PCC_ANCHORING_SWITCH option of the NsaDcMgmtConfig.NsaDcAlgoSwitch parameter is selected, this function takes effect. In this case, the
NsaPccAnchoringPriority parameter specifies the PCC priority, PCC anchoring in idle or connected mode is supported.

Confidential
NSA DC Independent Anchor Selection (Connected- EventA1+A5)
 When the NSA UE initiates a service in idle mode and enters the connected mode, if the NSA anchor priority of the accessed LTE cell is not the highest,
a handover is triggered to the cell with the highest NSA anchor priority to perform NSA DC.
1. When a UE initiates a service in idle mode and accesses the camping cell, the eNodeB determines whether the NSA PCC anchor priority of the current
cell is the highest. If yes, the eNodeB continues to perform services. If no, the eNodeB delivers a measurement control message to the UE based on
the UE capability, and the UE performs measurement and reports the candidate target cells.
2. The eNodeB selects a target cell in the measurement report to initiate a handover procedure to the target cell.
3. After receiving the handover command, the UE accesses the target cell to perform NSA DC.
NSA UE eNodeB
• The camping policy in idle
mode is the same as that
for legacy UEs.
Initiate a service and enter the connected mode.
• The eNodeB determines whether to support NSA
DC based on UE capabilities.
• For NSA UEs, the eNodeB checks whether the
current NSA anchor priority is the highest. If not,
the eNodeB delivers a measurement control
message to measure the frequency with the
highest priority.
EventA5(PCC A4) Inter-Frequency Measurement
NSA UE
LTE only UE
• When a UE initiates a service, the
UE is handed over to F2 based on
the dedicated priority.
• The NSA UE selects F1 during the first
cell reselection based on the common
priority.
High
Low
LTE
Common
Priority
High
Low
NSA
Dedicated Priority
F1
F2
Delivers the handover command (RRC Connect Recfg)
Selects the cell with the highest priority to initiate a
handover.
Accesses the cell with the highest anchor priority (HO
CMP)

Confidential
EN-DC Carrier Management(Leipzig)
 When UE enters idle mode from connected mode, the IMMCI IE in
the RRC Release message carries the NSA anchoring priority and
sends it to the UE. Based on the priority, the UE reselects a cell to
camp on with a high-priority frequency.
L800:6300
L2600:2850
L900:
3600
NSA PCC
Anchoring Priority
NSA UE
LTE UE
LTE only
CellReslectPriority
Idle Mode
NSA UE eNB
Initiate a service and enter the connected mode
• The eNodeB determines whether to support
NSA DC based on UE capabilities.
• For NSA UE, the eNodeB checks whether the
current NSA anchor priority is the highest. If
not, the eNodeB delivers a measurement
control message to measure the frequency
with the highest priority.
A5 Inter-Frequency Measurement
(PccA4RsrpThd=-111)
Delivers the handover command
(RRC Connect Recfg)
Selects the cell with the highest priority to
initiate a handover.
Accesses the cell with the highest anchor priority
(HO CMP)
Connected Mode
L700:
9460
L1800:1801
L2100:100 7
5
4
1
0
5
4
4
3
2

Confidential
NSA Anchoring Feature Activation Observation
In the drive test scenario, check whether this function takes effect based on the signaling on the UE side. The following is an
example:
After the UE initially accesses the network or is handed over to a low-priority
anchor (or non-anchor), it can be seen that the UE is actively handed over to a
high-priority anchor based on A1+A5.
When a UE releases an RRC connection from a low-priority anchor (or non-
anchor), the RRC release message IMMCI carries the dedicated reselection
priority for idle mode, and the UE performs cell reselection.
Connected mode
Idle mode

Confidential
Content
 5. Q&A

Confidential
EN-DC Mobility Management-SgNB Addition Procedure
UE eNodeB gNodeB MME
RRC CONN REQ
RRC CONN SETUP
RRC CONN SETUP CMP
UL NAS TRANS
INIT UE MESSAGE
INIT UE CONTEXT SETUP REQ
UE CAP ENQUIRE
UE CAP
SEC CMD
SEC CMP
RANDOM ACCESS
RRC RECFG
RRC RECFG CMP
INIT UE CONTEXT SETUP RSP
RRC RECFG(5G Cell Measure by B1 )
RRC RECFG CMP
B1 MEAS RPRT
SgNB Addition Rsp
RRC RECFG
（5g Scell Add）
RRC RECFG CMP
SgNB RECFG CMP
ERAB MOD IND
ERAB MOD CNF
EPC
LTE NR
Option 3x
EPC
LTE NR
Option 3x
EPC
LTE NR
Option 3x
EPC
LTE NR
Option 3x
UE CAP IND
5G neigbour
Measure
5G SCG ADD
Path Update
Procedure
（Opt 3x）
SgNB Addition Req
UE Initial
Access
Data Forwarding
S-GW
Data Forwarding
Bear Modication
X2 SetUp Req
X2 Setup Rsp
Performs NR measurement based on B1 to add SCG.
If ENDC SW ON, B1 meaconfig will delivered by eNB
Neighbor: 4-5/X2 sonsetup feature
NsaDcB1ThldRsrp=-119(N78)/-115(DSS)
Anchor preferred select based on independent nsa anchor
select policy :EventA5

Confidential
Process-Intra-SgNB Change
UE MeNB
1. NR A3 Measure Control
2. NR A3 Measure Report
5. RRC CONN RECFG(NR Reconfig)
6. RRC CONN RECFG CMP
8. Random Access
SgNB
3. RRC Transfer (NR A3)
4. SgNB Mod Req
7. SgNB Modification Confirm
1. The SgNB sends an A3 measurement control message to
the UE.
2. The UE sends an event A3 measurement report to the
MeNB.
3. The MeNB forwards the A3 measurement report to the
SgNB.
4. The SgNB initiates a change request to the MeNB.
5. The MeNB sends a reconfiguration command to the UE,
carrying the NR configuration.
6. The UE sends a reconfiguration completion message to the
MeNB.
7. The MeNB forwards the reconfiguration completion
message to the SgNB.
8. The UE sends a random access request to the SgNB.
The eNodeB transparently transmits
the NR A3 measurement report.

Confidential
Process-Inter-SgNB Change
UE MeNB
2. NR A3 Measure Report
7. RRC CONN RECFG(NR
Config)
S-SgNB
9. SgNB Change Confirm
MME
15. E-RAB Modification Indication
10. SgNB Reconfig CMP
16. E-RAB Modification Confirm
3. RRC Transfer (NR A3)
4. SgNB Change Required
5. SgNB Addition Request
6. SgNB Addition Request
Acknowledge
T-SgNB
12. SN Status Transfer
1. The S-SgNB sends an A3 measurement control
message to the UE.
2. The UE sends an A3 measurement report to the
MeNB to report a stronger NR neighboring cell.
3. The MeNB forwards the measurement information to
the S-SgNB.
4. The S-SgNB initiates an NR change request to the
MeNB.
5. The MeNB sends an NR addition request to the T-
SgNB.
6. The T-SgNB sends an NR addition acknowledge
message to the MeNB.
7. The MeNB sends a reconfiguration message to the
UE, carrying NR Config.
8. The UE sends a reconfiguration completion message
to the MeNB.
9. The MeNB sends a reconfiguration confirmation
message to the S-SgNB.
10. The MeNB sends a reconfiguration completion
message to the T-SgNB.
11. The UE sends a random access request to the T-
SgNB.
12. The S-SgNB sends an SN status transfer message to
the MeNB (only when the RLC mode is AM).
13. The MeNB forwards the SN status transfer message
to the T-SgNB (only when the RLC mode is AM).
14. The S-SgNB forwards data to the T-SgNB.
15. The MeNB sends a bearer change indication
message to the core network.
16. The core network sends a bearer change
confirmation message to the MeNB.
17. The MeNB sends a context release request to the S-
SgNB. 17. UE Context Release
14. Data Forwarding
11. Random Access

Confidential
Process-Intra-MeNB Handover
UE MeNB
1. LTE A3/A4 Measure Control
2. LTE A3/A4 Measure Report
5. RRC CONN RECFG(LTE intra-eNB HO CMD)
SgNB
3. SgNB Mod Req
4. SgNB Mod Req Ack
8. SgNB Reconfig CMP
6. Random Access
9. Random Access
1. The MeNB sends a measurement control message to the UE.
2. The UE sends a measurement report to the MeNB to report a
stronger neighboring LTE cell.
3. When an LTE handover occurs and the key is changed, the
MeNB sends a modification request to the SgNB, instructing
the NR side to modify the PDCP key.
4. The SgNB sends a modification request acknowledge
message to the MeNB.
5. The MeNB sends an LTE handover command to the UE,
carrying the NR configuration.
6. The UE resends a random access request to the MeNB.
7. The UE sends a handover completion message to the MeNB.
8. The MeNB sends a reconfiguration completion message to the
SgNB.
9. The UE sends a random access request to the SgNB.

Confidential
Process-Inter-MeNB Handover
UE S-eNB S-GW MME
1. LTE A3/A4
Measure Control
2. LTE A3/A4
Measure Report 3. HO Req
6. HO Req Ack
8. RRC CONN RECFG
10. RRC CONN RECFG
CMP
13. Path Switch
S-gNB
14. UE Context Rel
7. SgNB Rel
Req
15. UE Context Rel
T-eNB
5. SgNB Add Req ACK
4. SgNB Add Req
12. SgNB Recfg
CMP
9. Random Access
11. Random Access
1. The S-eNB sends an LTE measurement control message to the
UE.
2. The UE sends a measurement report to the S-eNB, indicating a
stronger inter-eNodeB neighboring LTE cell.
3. The S-eNB sends a handover request to the T-eNB.
4. The T-eNB sends an addition request to the S-gNB.
5. The S-gNB sends an addition acknowledge message to the T-
eNB.
6. The T-eNB sends a handover acknowledge message to the S-
eNB.
7. The S-eNB sends a release request to the S-gNB.
8. The S-eNB sends an inter-eNodeB handover command to the
UE.
9. The UE sends a random access request to the target cell.
10.The UE sends a handover completion message to the target
LTE cell.
11.The UE sends a random access request to the S-gNB.
12.The T-eNB sends a reconfiguration completion message to the
S-gNB.
13.The T-eNB sends a path switch message to the core network.
14.The T-eNB sends a context release request to the S-eNB.
15.The S-eNB sends a context release request to the S-gNB.

Confidential
SgNB release based on A2 measurement report: When the UE reports an NR's A2 measurement report, the SgNB triggers an SgNB release
based on the A2 measurement report.
UE MeNB
5. RRC CONN RECFG
SgNB
4. SgNB Release Confirm
3. SgNB Release Required
8. Data Forwarding
11. UE Context Release
MME
9. e-RAB Modification Indication
10. e-RAB Modification Confirm
1. A2 Report
2. A2 Report
SgNB Release
Receives A2
measurement report
and triggers SCG
release
PscellA2RsrpThld=-121

Confidential
Content
 5. FAQ

Confidential
Key Configuration Case of NSA Anchor Cell
//NSA DC SW和NSA DC Preferred Select:
MOD NSADCMGMTCONFIG: LocalCellId=**, NsaDcAlgoSwitch=NSA_DC_CAPABILITY_SWITCH-1&NSA_PCC_ANCHORING_SWITCH-1;// Anchor cell
MOD NSADCMGMTCONFIG: LocalCellId=**, NsaDcAlgoSwitch=NSA_DC_CAPABILITY_SWITCH-0&NSA_PCC_ANCHORING_SWITCH-1;// Non-Anchor cell
//NSA PCC anchoring Priority setting。其中锚点小区频点的优先级需要配置为非0，非锚点载波的优先级为0.
ADD PCCFREQCFG: PccDlEarfcn=100, NsaPccAnchoringPriority=7;
ADD PCCFREQCFG: PccDlEarfcn=<LTEonly>, NsaPccAnchoringPriority=0;
//增加NR SCG频点配置，PccDlEarfcn为NSA锚点频点，ScgDlArfcn和ScgDlArfcnPriority按照现网实际规划配置。
ADD NRSCGFREQCONFIG: PccDlEarfcn=100, ScgDlArfcn=<N78>, ScgDlArfcnPriority=8;
//PCC A4门限 (actually Threshold 2 for event A5 uses the A4 threshold) must be greater than the coverage-based event A2 threshold of the target frequency in case of PING PANG .
MOD PCCFREQCFG: PccDlEarfcn=xxx， NsaDcPccA4RsrpThld =-105;
//InterFreqNcell between LTE cell and NSA anchor cell
ADD EUTRANEXTERNALCELL:;
ADD EUTRANINTERNFREQ:;
ADD EUTRANINTERFREQNCELL:;
//The NSA UE threshold for coverage-based inter-frequency handovers can be configured separately.
//给小区新增异频切换Group参数，将A2/A4门限给NSA单独配置参数
ADD INTERFREQHOGROUP: LocalCellId=xxx, InterFreqHoGroupId=1, InterFreqHoA2ThdRsrp=-109, InterFreqHoA4ThdRsrp=-105, A3InterFreqHoA2ThdRsrp=-109;
Band Frequency
AnchoringPriorit
y
L2100 100 7
L1800 1801 5
L2600 2850 4
L800 6300 1
L900 3600 0
L700 9460 0
Band ScgDlArfcn
ScgDlArfcnPrior
ity
N28 156030 2
N28 156510 2
N3 372750 5
N78 629952 8
N78 630000 8
N78 631968 8

Confidential
NSA Mobility Management
//配置SCG添加业务量，以及周期性添加间隔
MOD NSADCMGMTCONFIG: LocalCellId=1, ScgAdditionBufferDelayThld=5, ScgAdditionBufferLenThld=30,
ScgAdditionInterval=10;
//配置NR的邻频点、外部小区及L-NR邻区等
ADD NRNFREQ: LocalCellId=1, DlArfcn=512964, UlArfcnConfigInd=NOT_CFG, ConnFreqPriority=6;
ADD NREXTERNALCELL: Mcc="460", Mnc="00", GnodebId=53041, CellId=123, DlArfcn=512964,
UlArfcnConfigInd=NOT_CFG, PhyCellId=214, Tac=405;
ADD NRNRELATIONSHIP: LocalCellId=21, Mcc="262", Mnc="01", GnodebId=53041, CellId=123;

Confidential
Content
 4. EN-DC Key Parameter
 5. Q&A

Confidential
QA1- Why No B1 measurement configuration delivered by anchor cell?
Check Items:
DC SWITCH: NSA_DC_CAPABILITY_SWITCH-1
ScgDlArfcn configuration: SSB FRQ, NOT Absolute Frequency NARFCN
QA2- Why UE Not report B1 Mearuement Report?
QA3-Why no SCG added after B1 MR reported?
Check Items:
NREXTERNALCELL improperly configured
4-5 neighbor relation missing
X2 abnoamal, sonsetup feature disabled
PCI conflict among the neighbor cells
Check Items:
whether the B1 threshold is too high, or the NR coverage is poor.
whether the ScgDlArfcn r is consistent with the gNodeB frequency.

Thank You
www.huawei.com
Copyright©2013 Huawei Technologies Co., Ltd. All Rights Reserved.
The information in this document may contain predictive statements including, without limitation, statements regarding the future financial
and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and
developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for
reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.
Confidential

1-NSA Basical Precedure Introduction -trainning 5G RADIO FREQUENCY EMERSON EDUARDO RODRIGUES.pptx

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to 1-NSA Basical Precedure Introduction -trainning 5G RADIO FREQUENCY EMERSON EDUARDO RODRIGUES.pptx

Similar to 1-NSA Basical Precedure Introduction -trainning 5G RADIO FREQUENCY EMERSON EDUARDO RODRIGUES.pptx (20)

More from EMERSON EDUARDO RODRIGUES

More from EMERSON EDUARDO RODRIGUES (20)

Recently uploaded

Recently uploaded (20)

1-NSA Basical Precedure Introduction -trainning 5G RADIO FREQUENCY EMERSON EDUARDO RODRIGUES.pptx