GSM(Global System for Mobile)GSM(Global System for Mobile)andand

LTE(Long Term Evolution)LTE(Long Term Evolution)Network Architecture OverviewNetwork Architecture Overview

GSM(Global System for Mobile)GSM(Global System for Mobile)andand

LTE(Long Term Evolution)LTE(Long Term Evolution)Network Architecture OverviewNetwork Architecture Overview

Mobile Wireless Network EvolutionMobile Wireless Network Evolution

Ref. LTE The UMTS Long Term Evolution, From Theory to Practice,Stefania Sesia, Issam Toufik and Matthew Baker

GSM Network Architecture

Various Interfaces used in GSM

1. GSM Network Architecture1. Mobile Station Subsystem (MSS)2. Base Station Subsystem (BSS)3. Network and SwitchingSubsystem (NSS)4. Operation and SupportSubsystem (OSS)

Ref. Wireless Technology, Protocols, Standards, and Techniques by Michel Daoud Yacoub

1. Mobile Station Subsystem (MSS)TE - Terminal EquipmentTA -Terminal AdapterMT - Mobile TerminationSIM - Subscriber Identity Module SIM

GSM Network Cont.GSM Network Cont.2. Base Station Subsystem (BSS)BSS is responsible for the radiocoverage of a given geographic regionand for appropriate signal processing.BTS- Base Station TransceiverBSC- Base Station Controller

3. Network and Switching Subsystem (NSS)MSC-Mobile Switching CenterHLR-Home Location RegisterVLR-Visitor Location RegisterAuC-Authentication CenterEIR-Equipment Identity Register

4.Operation and Support Subsystem (OSS)Operation and Maintenance CenterNetwork Management Center

2. LTE Network Architecture[Fig] 3GPP architecture evolution towardsflat architecture

Ref. LTE for UMTS Evolution to LTE-Advanced, Harri Holma and Antti Toskala

Optimization for packet switched services in general, when there is no longer aneed to support the circuit switched mode of operation (IP based)Optimized support for higher throughput required for higher end user bit ratesImprovement in the response times for activation and bearer set-upImprovement in the packet delivery delaysoverall simplification of the system compared to the existing 3GPP and othercellular systemsoptimized inter-working with other 3GPP access networksoptimized inter-working with other wireless access networks

a)a) System architecture for ESystem architecture for E--UTRAN only networkUTRAN only network1. User Equipment (UE)2. Evolved UTRAN (E-UTRAN) Evolved3. Packet Core Network(EPC)4. Services domain

LTE encompasses the evolution of theradio access through the Evolved-UTRAN(E-UTRAN)It is accompanied by an evolution of thenon-radio aspects under the term SystemArchitecture Evolution (SAE) whichincludes the Evolved Packet Core (EPC)network.Together LTE and SAE comprise theEvolved Packet System (EPS)

LTE encompasses the evolution of theradio access through the Evolved-UTRAN(E-UTRAN)It is accompanied by an evolution of thenon-radio aspects under the term SystemArchitecture Evolution (SAE) whichincludes the Evolved Packet Core (EPC)network.Together LTE and SAE comprise theEvolved Packet System (EPS)

b)b) EE--UTRAN Node B (UTRAN Node B (eNodeBeNodeB), connections to other logical nodes), connections to other logical nodes

Mobility Management Entity (MME) is the main control element in the EPC

c)c) Serving Gateway (SServing Gateway (S--GW) connections to other logical nodesGW) connections to other logical nodes

d)d) eNodeBeNodeB selfself--configurationconfiguration of S1of S1--MME and X2 InterfacesMME and X2 Interfaces

Global eNodeB IDInformation of the cell specific parameters such as Physical Cell ID (PCI),uplink/downlink frequency used, bandwidth in useMMEs connected (MME Pool)

e)e) 3GPP Inter3GPP Inter--working System Architectureworking System ArchitectureConfigurationConfiguration

UE - Single radio operationE-UTRAN - Mobility to andfrom other 3GPP Ans EPC has a central role for theinter-working systemarchitecture

Fig. 3GPP Inter-working System ArchitectureConfiguration

UE - Single radio operationE-UTRAN - Mobility to andfrom other 3GPP Ans EPC has a central role for theinter-working systemarchitecture