LTE Core Network
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This document provides an overview of the LTE network architecture including: 1) The LTE network introduces a new radio access network called E-UTRAN and a new core network called EPC. 2) Key components of the EPC include the MME for control plane functions, the SGW for user plane functions and mobility, and the PGW which acts as an anchor for the user plane. 3) The architecture supports interworking with other 3GPP networks like UMTS/GPRS and non-3GPP networks like WiFi. It also defines interfaces for connecting to external networks. 4) The network provides IP connectivity and supports different bearer types for implementing Quality
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LTE Core Network
- 1. This document is offered compliments of BSP Media Group. www.bspmediagroup.com All rights reserved.
- 2. LTE Core Network All material is Copyright © Informa Telecoms & Media 2001-2010
- 3. Overall LTE Architecture S2 EPC SGi S3, S4 2 S1
- 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. 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. 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. 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. S1 Flex - RAN Sharing EPC - A EPC - B 7
- 9. EPS Node Functions in Detail All material is Copyright © Informa Telecoms & Media 2001-2010
- 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. 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. 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. LTE Services and Bearers All material is Copyright © Informa Telecoms & Media 2001-2010
- 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. QoS Class Identifier Values 14 EPS Bearer Properties
- 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. 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