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LTE Signaling & Procedure
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Objectives
Upon completion of this course, you will be able to:
Describe the concepts of the LTE UE connections
Describe the procedure of random access
Describe the procedure of RRC setup
Describe the procedure of S1 signaling setup
Describe the procedure of E-RAB setup
Describe the structure of QoS in EPS
Describe the QoS mapping in EPS
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Dedicated Radio Bearer Management
5. QoS in EPS
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UE Connections
LTE UE connection includes :
Connection between the UE and eNodeB
Connection between the UE and MME
The connection management is performed in:
Control plane
User plane
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Control Plane Connection
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User Plane Connection
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Classification of EPS Bearer
Page7
UE PDN-GWDefault EPS Bearer
Dedicated EPS Bearer (Maximum of 7) TFTTFT
Each Dedicated EPS Bearers has an associated TFT (Traffic Flow Template)
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UE Connection Setup Procedure
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Dedicated Radio Bearer Management
5. QoS in EPS
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Purposes Random Access
Through the RA procedure, the UE can:
Obtain the uplink synchronization signals from the
network
Request dedicated resources for data transmission
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Trigger of Random Access
UE initiates RA procedure in following scenarios :
initial RRC connection establishment
RRC connection reestablishment
Handover
UE is noticed downlink data arrival
UE detects Uplink data arrival
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Contention-based and Non-Contention-based Random Access the RA procedure can be categorized into the
following types :
Contention-based RA
Handover
UE is noticed downlink data arrival
Contention-based RA
initial RRC connection establishment
RRC connection reestablishment
UE detects uplink data arrival
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Contention-based Random Access Contention-based Random Access Procedure :
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Random Access preamble
SequenceCP
TCP TSEQ Guard PeriodPreamble
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Random Access preamble Format
Preamble Format Burst TCP TSEQ FDD Cell Radius (R) TDD Cell Radius (R)
0 1,000 µs 103.1 µs 800 µs R ≤ 14.5km 1.4 km < R ≤ 14.5 km
1 2,000 µs 684.4 µs 800 µs 29 km < R ≤ 77.3 km 29 km < R ≤ 77.3 km
2 2,000 µs 203.1 µs 1,600 µs 14 km < R ≤ 29.5 km 14 km < R ≤ 29.5 km
3 3,000 µs 684.4 µs 1,600 µs 77 km < R ≤ 100 km 77 km < R ≤ 100 km
4 167.9 µs 14.58 µs 133.33 µs Not involved. R ≤ 1.4 km
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Preamble Sequence
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Parameters of Random Access Preamble PreambleFmt
Parameter name: preamble format
Recommended value: 0
RootSequenceIdx
Parameter name: Root sequence index
Recommended value: None
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Random Access Response
MAC RAR A
Sub Header A
MAC RAR B
MAC RAR n
RAPID Oct 1E T
Sub Header BSub Header n
TARUL GrantTA
UL GrantUL Grant
Temporary C-RNTITemporary C-RNTI
MAC RAR
RAPID or BI
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Uplink Data Transmission
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Contention Resolution
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Non-Contention-based Random Access
Non-contention-based Random Access Procedure :
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RA Backoff Control
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management Procedure
4. Dedicated Radio Bearer Management Procedure
5. QoS in EPS
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Architecture of the Protocol Stack for Signaling Connection
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RRC States
LTE Detached
LTE ActiveRRC Connected
LTE IdleRRC Idle
PLMN SelectionBroadcast of System Information
Cell Selection
RRC Connection (SRB)RRC Context in eNBUE Known in a Cell
Send and/or Receive Data to/from UENetwork Controlled Mobility
Measurement ControlUE Monitors Scheduling Control Channel
UE Reports Channel QualityUE can send Feedback Information
DRX can be Configured
DRX configured by NASBroadcast of System Information
PagingCell Reselection Mobility
GUTI AllocatedLocated in Tracking Area(s)
No RRC Context Stored in the eNB
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RRC Connection Establishment
RRC Connection RequesteNBUE
RRC Connection Setup
RRC Connection Setup Complete
RRC Connection RequestUE IdentityCause
RRC Connection SetupRadio Resource Config Dedicated- srb-ToAddModList- drb-ToAddModList- drb-ToReleaseList- MAC Main Config- SPS Config- Physical Config Dedicated
RRC Connection Setup CompleteSelected PLMN-IdentityRegistered MMEDedicated Info NAS
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RRC Connection Reestablishment
RRC Connection Reestablishment is applied in
following cases: Handover failure
RRC reconfiguration failure
Radio link failure
Integrity check failure
If security in the AS is not activated, a UE cannot
initiate RRC connection reestablishment.
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RRC Connection Reestablishment Procedure
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Dedicated S1 Connection and SRB2 Establishment
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S1 Initial UE Message
Page32
Initial UE MessageeNB
Initial UE MessageeNB UE S1AP ID NAS-PDUTAIE-UTRAN CGIS-TMSI (O)CSG Identity (O)RRC Establishment causeGUMMEI (O)
MME
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Downlink NAS TransporteNB MME
Uplink NAS Transport
Downlink and Uplink NAS Transport
Page33
Downlink NAS TransportMME UE S1AP ID eNB UE S1AP ID NAS-PDUHandover Restriction List (O)
Uplink NAS TransportMME UE S1AP ID eNB UE S1AP ID NAS-PDUE-UTRAN CGITAI
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S1 Initial Context Setup Request
Page34
Initial Context Setup Request
eNB
Initial Context Setup RequestMME UE S1AP ID eNB UE S1AP ID UE Aggregate Maximum Bit RateE-RAB to Be Setup List - E-RAB ID- E-RAB Level QoS Parameters- Transport Layer Address- GTP-TEID- NAS-PDU (O)UE Security CapabilitiesSecurity KeyTrace 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)
MME
Initial Context Setup Response
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S1 Initial Context Setup Response
Page35
Initial Context Setup Request
eNB MME
Initial Context Setup Response
Initial Context Setup ResponseMME UE S1AP ID eNB UE S1AP ID E-RAB Setup List - E-RAB ID- Transport Layer Address- GTP-TEIDE-RAB Failed to Setup List (O)Criticality Diagnostics (O)
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Dedicated Radio Bearer Management
5. QoS in EPS
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Initial Dedicated Radio Bearer Establishment
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Dedicated Radio Bearer Establishment
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S1 E-RAB Setup Request
Page39
E-RAB Setup RequestMME UE S1AP ID eNB UE S1AP ID UE Aggregate Maximum Bit Rate (O)E-RAB to Be Setup List - E-RAB ID- E-RAB Level QoS Parameters- Transport Layer Address- GTP-TEID- NAS-PDU
E-RAB Setup RequesteNB MME
E-RAB Setup Response
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S1 E-RAB Setup Response
Page40
E-RAB Setup RequesteNB MME
E-RAB Setup Response
E-RAB Setup ResponseMME UE S1AP ID eNB UE S1AP ID E-RAB Setup List - E-RAB ID- Transport Layer Address- GTP-TEIDE-RAB Failed to Setup List (O)Criticality Diagnostics (O)
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Dedicated Radio Bearer Modification
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Dedicated Radio Bearer Release
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Dedicated Radio Bearer Management
5. QoS in EPS
Copyright © 2010 Huawei Technologies Co., Ltd. All rights reserved.
QoS Structure in EPS
UE: User Equipment
S-GW:Serving Gateway
eNodeB: evolved NodeB
P-GW: Packet Data Network
Gateway
Page44
P-GW: Packet Data Network
Gateway
HSS: Home Subscriber Server
AF: Application Function
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QoS Parameters - QCI
Page45
QCI Type Priority
Packet Delay Budget (ms)
Packet Error Rate
Example Service
1 GBR 2 100 10-2 Conversational Voice2 GBR 4 150 10-3 Conversational Video3 GBR 3 50 10-3 Real Time Gaming
4 GBR 5 300 10-6 Non-Conversational Voice
5 Non-GBR 1 100 10-6 IMS Signaling
6 Non-GBR 6 300 10-6 Video, TCP Based
7 Non-GBR 7 100 10-3 Voice, Video, Interactive Gaming
8 Non-GBR 8 300 10-6 Video, TCP Based
9 Non-GBR 9 300 10-6 Video, TCP Based
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QoS Parameters – ARP
ARP (Allocation and Retention Priority), is used
define the priority of EPS resource allocation and
retention, defined in EPC
ARP only take effect during admission process, not
for scheduling. Once the bearer is setup, the ARP
doesn’t any effect of the current bearer.
Page46
ARP Value Service Priority
1~5 Gold
6~10 Silver
11~15 Copper
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QoS Parameters – GBR/MBR
Page47
Actual server rate
GRB
Pass
MRB
Perform congestion control
Drop
Guaranteed Bit Rate
MBR: Maximum Bit Rate
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QoS Parameters - AMBR
AMBR: Aggregate Maximum Bit Rate, is used for
Non-GBR services, can be shared by serval EPS
beaers
Page48
APN1
APN2
APN-AMBR
APN-AMBR
Internet
Intranet
UE-AMBR
UE-AMBR
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Parameters in Each Elements
QoS Parameters
QCI ARP GBR MBR UE-AMBR
APN-AMBR
HSS Yes Yes No No Yes Yes
P-GW Yes Yes Yes Yes No Yes
eNodeB Yes Yes Yes Yes Yes No
UE Yes No Yes Yes No Yes
Page49
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QoS Management
Page50
EPC
QoS Parameters delivery
QCIARPGBRMBRAMBR
QoS mapping RRM: Admission control Load control Scheduling
Radio QoS
QoS mapping (DSCP)TRM: Admission control Load control Flow control
Transport QoS
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