This document is offered compliments of
BSP Media Group. www.bspmediagroup.com
All rights reserved.
LTE Core Network

All material is Copyright © Informa Telecoms & Media 2001-2010
Overall LTE Architecture

S2

EPC

SGi

S3, S4

2

S1
LTE Architecture (high level)
New Access Network
Base Station - Evolved Node B
X2 interface for improved Handover and Inte...
LTE Architecture (high level)
New Core Network
• Evolved Packet Core
• All IP for efficiency
• New Network Elements
• Desi...
LTE Architecture (high level)
Interworking
Defined interfaces for interworking
UMTS/GPRS interworking
WiFi/WiMAX Interwork...
LTE Architecture (high level)
Connection to External Networks
IMS, MMS, WAP, Media Centers

IMS
WLAN

SGi

SGs

S2

PGW

S...
S1 Flex - RAN Sharing

EPC - A

EPC - B

7
EPS Node Functions in Detail

All material is Copyright © Informa Telecoms & Media 2001-2010
MME Functions

•

NAS signalling

•

Inter CN node signalling for
mobility between 3GPP
access networks

•

UE Reachabilit...
SGW Functions
•
•

Mobility anchoring for inter3GPP mobility

•

ECM-IDLE mode downlink
packet buffering

•

Initiation of...
PGW Functions

Allocation of UE IP
addresses

•

Downlink packet marking

•

Service level charging,
gating and rate
enfor...
LTE Services and Bearers

All material is Copyright © Informa Telecoms & Media 2001-2010
Services for LTE
LTE Services
• 3rd Party Content
• Operator Managed Content
• Video, Social Networking, WWW

LTE Network
...
QoS Class Identifier Values


14

EPS Bearer Properties
Policy Control
Application

Application Function
Responsible for offering applications that require the
control per sessio...
Policy and Charging Rules Function
Billing

PCRF

Gx
Predefined rules
• Provisioned in the PCEF
• Referenced by the PCRF
D...
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LTE Core Network

  1. 1. This document is offered compliments of BSP Media Group. www.bspmediagroup.com All rights reserved.
  2. 2. LTE Core Network All material is Copyright © Informa Telecoms & Media 2001-2010
  3. 3. Overall LTE Architecture S2 EPC SGi S3, S4 2 S1
  4. 4. LTE Architecture (high level) New Access Network Base Station - Evolved Node B X2 interface for improved Handover and Interference Management Backhaul Connections are Critical, Capacity Downlink Radio Interface Orthogonal Frequency Division Multiple Access (OFDMA) Improved Performance in Urban Areas Multiple In Multiple Out (MIMO) Uplink Radio Interface Single Carrier Frequency Division Multiple Access (SC-FDMA) Good Urban Area Performance Designed for Good Battery Life eNB X2 eUTRAN 3 eNB – Evolved Node B;MME – Mobility Management Entity; SGW – Serving Gateway P-GW – Packet Data Gateway UE – User Equipment eNB UE
  5. 5. LTE Architecture (high level) New Core Network • Evolved Packet Core • All IP for efficiency • New Network Elements • Designed to be Flexible and Scalable • Self Organising Network (SON) PGW MME PGW and SGW • The Control Plane of the network • Provides Admission Control and Mobility functions S5 SGW • The User Plane of the Network • Manages the flow of User Data and application signalling S1-U eNB S11 EPC All IP All New 4 X2 eUTRAN MME S1-MME eNB – Evolved Node B;MME – Mobility Management Entity; SGW – Serving Gateway P-GW – Packet Data Gateway UE – User Equipment eNB UE
  6. 6. LTE Architecture (high level) Interworking Defined interfaces for interworking UMTS/GPRS interworking WiFi/WiMAX Interworking Interworking with Trusted/non-Trusted WLAN S2 PGW UMTS S3,S4,S12 S5 SGW S1-U eNB S11 EPC All IP All New 5 X2 eUTRAN MME S1-MME eNB – Evolved Node B;MME – Mobility Management Entity; SGW – Serving Gateway P-GW – Packet Data Gateway UE – User Equipment eNB UE
  7. 7. LTE Architecture (high level) Connection to External Networks IMS, MMS, WAP, Media Centers IMS WLAN SGi SGs S2 PGW S5 SGW UMTS S3,S4,S12 S1-U eNB S11 EPC All IP All New 6 X2 eUTRAN MME S1-MME eNB – Evolved Node B;MME – Mobility Management Entity; SGW – Serving Gateway P-GW – Packet Data Gateway UE – User Equipment eNB UE
  8. 8. S1 Flex - RAN Sharing EPC - A EPC - B 7
  9. 9. EPS Node Functions in Detail All material is Copyright © Informa Telecoms & Media 2001-2010
  10. 10. MME Functions • NAS signalling • Inter CN node signalling for mobility between 3GPP access networks • UE Reachability in ECMIDLE state Tracking Area list management • PDN GW and Serving GW selection • MME selection for handovers with MME change • SGSN selection • Authentication • Bearer management functions including dedicated bearer establishment • Lawful Interception of signalling traffic MME 9
  11. 11. SGW Functions • • Mobility anchoring for inter3GPP mobility • ECM-IDLE mode downlink packet buffering • Initiation of network triggered service request procedure • Lawful Interception point in the network • Packet routing and forwarding • 10 Assist the eNodeB reordering function during inter-eNodeB handover • SGW Local Mobility Anchor point for inter-eNodeB handover Transport level packet marking in the uplink and the downlink
  12. 12. PGW Functions Allocation of UE IP addresses • Downlink packet marking • Service level charging, gating and rate enforcement • Mobility anchor 3GPP and non-3GPP • 11 Packet filtering, via deep packet inspection • PGW • Terminates the SGi interface towards the PDN
  13. 13. LTE Services and Bearers All material is Copyright © Informa Telecoms & Media 2001-2010
  14. 14. Services for LTE LTE Services • 3rd Party Content • Operator Managed Content • Video, Social Networking, WWW LTE Network • Is a transport/delivery network • Can manage content QoS • High capacity means many customers Content Management • IMS • Service Delivery Platform • LTE compatible with existing solutions 13
  15. 15. QoS Class Identifier Values  14 EPS Bearer Properties
  16. 16. Policy Control Application Application Function Responsible for offering applications that require the control per session flow. It can forward to PDP setup information for taking decision and applying policy rules in any stage of session flow. Policy Decision Point PDP Responsible for primarily making policy decision per session or flow basis. It authorizes QoS resources for each flow using the setup information received via Application Server or PEP. It can use of additional mechanisms and protocols to achieve additional functionality such as user authentication, accounting, policy information storage, etc. Policy Enforcement Point Responsible for applying the policy rules from PDP, enforcing per session or flow basis the current allowed traffic contract. It receives a notification or a message that requires a policy decision. PEP 15 The PEP then formulates a request for a policy decision and sends it to the PDP. The PDP returns the Policy decision and the PEP then enforces the policy decision by accepting or denying the request.
  17. 17. Policy and Charging Rules Function Billing PCRF Gx Predefined rules • Provisioned in the PCEF • Referenced by the PCRF Dynamic rules • Provisioned by the PCRF • Provides PCC rule information to the PCEF 16

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