LTE Architecture Overview Prepared by Amr Elshabrawy
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LTE Architecture Overview
Prepared by Amr Elshabrawy
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Objectives
› What is LTE ?
› Why LTE ?
› LTE Peak rates compared to WCDMA rates.
› LTE Network Architecture.
› LTE Interfaces
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What is LTE?
› LTE RAN is the Ericsson solution for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) specified by 3GPP.
› Ericsson's LTE RBS types implement the 3GPP eNodeB concept, also known as the eNB.
› E-UTRAN is an evolution of Universal Terrestrial Radio Access Network (UTRAN) in radio access, network architecture and transport network technologies.
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Why LTE ?
› LTE RAN offers:
1. Better spectrum flexibility
2. Higher peak rates and bandwidths
3. Lower operating costs.
These characteristics provide enriched services for end users.
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Peak Data Rate Evolution in WCDMA
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LTE Network Architecture
1. EPC Evolved Packet Core
2. EPS Evolved Packet System
3. MME Mobility Management Entity
4. NMS Network Management System
5. OSS-RC Operations Support System – Radio and Core (OSS-RC)
6. PDN-GW Packet Data Network Gateway
7. SGW Serving Gateway
8. UE User Equipmen
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Evolved Packet Core
› EPC is the IP-based core network between LTE and other networks. On the user plane EPC connects LTE with the SGW, and on the signalling plane with the MME.
› The PDN-GW provides the user plane interface to other packet data networks.
› The Ericsson solution for the 3GPP nodes SGW and PDN-GW is the Converged Packet Gateway (CPG) hosting both the SGW and the PDN-GW.
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RBS-eNodeB-
› The RBS is the node in LTE that implements the 3GPP eNodeB concept.
› The RBS controls the radio connections with connected UE and manages the cell resources including connection mobility control.
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Transport Network (IP)
› The IP transport network provides interconnection between the RBSs and the nodes in the EPC network, between individual RBSs, and between OSS-RC and the RBSs.
› LTE data transport is IP-based, permitting a range of physical layers. The User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP), and Transmission Control Protocol (TCP) are used on the layer above IP. The transport network has no specific LTE functions.
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LTE External Interfaces
1. Mun
2. Uu
3. S1
4. Mul
5. X2
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LTE External Interfaces-cont.
› The S1 interface is divided into the control plane and the user plane. The S1 control plane terminates in the core network node MME, and the S1 user plane terminates in the core network node SGW.
› The S1 interface provides the capability for individual RBSs to connect to several MME and SGW nodes.
› The Mun interface provides access to OSS-RC for external network management systems.
› The Uu inteface is the LTE external radio interface, the air interface towards the UE. The Uu interface is used to control the radio connection in terms of mobility, security, and bearer management.
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LTE Internal Interfaces
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LTE Internal Interfaces-Cont
› An X2 interface connects RBS pairs having neighboring cells and belonging to the same MME pool. For network management, the RBS has the Mul interface towards OSS-RC. The Mul interface is also used to manage the node on-site using client software on a personal computer.
› A commercial LTE contains multiple instances of each interface.
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