A Quick in-depth Bite on LTE Network Architecture

What exactly is Long term evolution (LTE)?

  •4G wireless broadband technology developed by the Third  Generation Partnership Project (3GPP)

  •Based on the GSM/EDGE and UMTS/HSPA network technologies

• Uses OFDM (Orthogonal Frequency Division Multiplexing) and, in later releases, MIMO (Multiple Input Multiple Output) antenna  technology

• Only Packaged connectivity

• Downlink - 100Mbps

• Uplink – 50Mbps

Need for LTE?

• User demand for higher data rates and quality of service• Packet Switch optimized system• Continued demand for cost reduction (CAPEX and OPEX)• Low complexity• Avoid unnecessary fragmentation of technologies for paired and unpaired band operation• Lowering Packet delay

   LTE Technologies :OFDM (Orthogonal division multiple multiplexing) for downlinkSC-FDMA (Single carrier-frequency division multiple access) for uplinkMIMO (Multiple Input Multiple output)

LTE Network ElementsEvolved Node B• Supports air interface• Resource management (Allocation and Hand over)• Cell information broadcast• Ciphering/deciphering of user and control data• Admission control

Mobility Management network (MME)

• Authentication of users• Idle mode UE tracking and paging• Radio link activation/deactivation process• Control mobility between LTE and 2G/3G access
Servicing Gateway• Routing and forwarding user data packet• Acts as mobility anchor during inter eNodeB handovers and for mobility
    between LTE and other 3GPP networks• Paging for idle state use

Packet Data Network Gateway

• Provides connectivity to the UE to external packet data networks(IP addresses)

• Performs lawful interception, policy enforcement, packet screening

• Acts as the anchor for mobility between 3GPP and non 3GPP technologies

    (WiMAX)

Future of LTE•Significant improvements in 3GPP Release 10, also known as ‘LTE-  Advanced’• Carrier Aggregation• Higher order MIMO• Deployment and Adoption of Relay Nodes and Heterogeneous networks• Coordinated Multipoint (CoMP) Transmission• Downlink – 3Gbps• Uplink – 1.5Gbps

LTE – Air Interface 

•Packet scheduling i.e. allocates time and frequency to the UE

•Different time and different frequency -> No cell interference

•We have timing advance in LTE, ensures sending timing message to UE

•In case of overlap , there will be own cell interference

•Max coverage of LTE cell theoretically ->  100 kms

LTE CAPACITY  ( LTE CELL THROUGHPUT)

LTE Comparison Between GSM, UMTS and LTE

Now finally How simply we can defined LTE: 

So this journey was a bit long ... but still would call it a Quick Bite on LTE , pls write and leave your advise here as how useful did you find this to take an fair understanding on the subject . Will connect again with some another interesting subject ... (: