LTE eRAN3.0 Connection Management
Feature
1
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LTE eRAN6.0 Connection Management Feature
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Objectives
� Upon completion of this course, you will be able to:
� Describe the concepts of the LTE UE connections
� Outline the connection management procedures
� Outline the parameters for the connection management
LTE eRAN3.0 Connection Management
Feature
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Data Radio Bearer Management
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UE Connections
� LTE UE connection includes :
� Connection between the UE and eNodeB
� Connection between the UE and EPC
� The connection management is performed in:
� Control plane
� User plane
LTE eRAN3.0 Connection Management
Feature
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Control Plane Connection
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User Plane Connection
LTE eRAN3.0 Connection Management
Feature
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Classification of EPS Bearer
Page6
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UE Connection Setup Procedure
LTE eRAN3.0 Connection Management
Feature
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Data Radio Bearer Management
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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
LTE eRAN3.0 Connection Management
Feature
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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
� For positioning purpose
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Contention-based and Non-Contention-
based Random Access
� the RA procedure can be categorized into the following
types :
� Non-Contention-based RA
� Handover
� UE is noticed downlink data arrival
� For positioning purpose
� Contention-based RA
� initial RRC connection establishment
� RRC connection reestablishment
� UE detects Uplink data arrival
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Feature
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Contention-based Random Access
� Contention-based Random Access Procedure :
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Random Access preamble
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Feature
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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 29.5 km < R ≤ 77.3 km 29 .5km < R ≤ 77.3 km
2 2,000 µs 203.1 µs 1,600 µs 14 .5km < R ≤ 29.5 km 14.5 km < R ≤ 29.5 km
3 3,000 µs 684.4 µs 1,600 µs 77 .3km < R ≤ 100 km 77 .3km < R ≤ 100 km
4 167.9 µs 14.58 µs 133.33 µs Not involved. R ≤ 1.4 km
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Related Parameters
� Command: MOD CELL
Page15
Parameter to set the preamble format
Parameter to set the cell radius
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Feature
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Preamble Sequence
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Related Parameters
� Command: MOD CELL
Page17
Parameter to set the root sequence index
LTE eRAN3.0 Connection Management
Feature
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Random Access Response
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Uplink Scheduled Data Transmission
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Feature
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Contention Resolution
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RA Backoff Control
LTE eRAN3.0 Connection Management
Feature
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Non-Contention-based Random Access
� Non-contention-based Random Access Procedure :
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Related Parameters
� Command: MOD CELLALGOSWITCH
Page23
Some parameters forrandom access
LTE eRAN3.0 Connection Management
Feature
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Data Radio Bearer Management
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Architecture of the Protocol Stack for
Signaling Connection
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Feature
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RRC States
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RRC Connection Establishment
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Feature
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RRC Connection Establishment
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Related Parameters
� Command: MOD RRCCONNSTATETIMER
Page29
Parameter to set timer 302
LTE eRAN3.0 Connection Management
Feature
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Dedicated S1 Connection Setup
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Dedicated S1 Connection Setup
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Feature
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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
LTE eRAN3.0 Connection Management
Feature
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S1 Initial UE Message
Page34
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Downlink and Uplink NAS Transport
Page35
LTE eRAN3.0 Connection Management
Feature
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S1 Initial Context Setup Request
Page36
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S1 Initial Context Setup Response
Page37
LTE eRAN3.0 Connection Management
Feature
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Signaling Link Release
� The signaling link release is initiated in the following
two scenarios:
� The MME initiates a UE Context Release Command message
� After detecting an exception, the eNodeB sends the MME a UE
Context Release Request message
� Signaling Link Release include:
� Release of the dedicated S1 connection
� Release of the RRC connection
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Signaling Link Release Procedure
LTE eRAN3.0 Connection Management
Feature
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Related Parameters
� Command: MOD RRCCONNSTATETIMER
Page40
Parameter to set UE inactive timer
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Contents
1. Connection Management Overview
2. Random Access
3. Signaling Connection Management
4. Data Radio Bearer Management
LTE eRAN3.0 Connection Management
Feature
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Dedicated Radio Bearer Establishment
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S1 E-RAB Setup Request
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LTE eRAN3.0 Connection Management
Feature
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S1 E-RAB Setup Response
Page44
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Dedicated Radio Bearer Modification
LTE eRAN3.0 Connection Management
Feature
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Dedicated Radio Bearer Release
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Reference: Parameter description
� For detail, please refer to the notes.
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LTE eRAN3.0 Connection Management
Feature
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