Explain LTE network architecture.

LTE architecture :

The LTE architecture mainly consist following nodes and interfaces.

Nodes:

UE – User equipment

E-UTRAN (eNodeB) – Evolved EUTRAN

MME – Mobility management entity

SGSN – serving GPRS support node

HSS – Home Subscriber Server

SGW – Serving Gateway

PGW – PDN(Packet data network ) Gateway

PCRF – Policy and Charging Rules Function

Interfaces:

LTE-Uu – It is an air interface which is used to communicate between UE and eNodeB.

S1-MME – This interface is used to communicate between eNodeB and MME.

S1-U – This interface is used to communicate between eNodeB and SGW. It carries user plane data.

S5/S8 – This interface is used to communicate between SGW and PGW.

S10 – This interface is used to communicate between MME to another MME.

S11 – This interface is used to communicate between MME and SGW.

S6a – This interface is used to communicate between MME and HSS.

S3 – This interface is used to communicate between MME and SGSN.

X2  – This interface is used to communicate between eNodeB to another eNodeB.

Also there are many others interfaces used in LTE, each having their own purpose.

 

For more architectural details go through 3GPP specification 23.401.

 

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