LTE-EPC Overview

Scalability of bandwidth

Urban areas:

Most likely LTE will be deployed.

Stepwise deployment in UMTS 2.1 bands will be possible at a later stage.

Rural areas:

Option 1: deploy UMTS in 900 MHz band.

Advantage: rollout can start now

Disadvantage: a block of 5 MHz need to be taken out of the GSM band. Not a lot of operators can afford to take out this much of spectrum due to heavy usage in this band

Option 2: Introduce LTE in 900 MHz band

Advantage: reuse of GSM 900 Sites.

step by step introduction of LTE with smaller granularity (1.4 / 3 / 5 /MHz).

Cost per MByte decreases with introduction of new technologies.

From HSPA > LTE cost per MByte will reduce with more than 70%

Why?

-Increased spectral efficiency > bits per Hz per cell for LTE (2X2 MIMO) ~ 1.7

-Flat architecture.

-Reuse of spectrum > Refarming of existing 900 MHz band in rural areas possible. For urban larger bandwidth expected in 2.6 GHz

SAE: System Architecture Evolution

SAE GW: Serving Gateway +PDN Gateway

UDP: User Datagram Protocol ( L4 Transport Layer)

SCTP: Stream Control Transmission Protocol. For IP signalling

GTP: GPRS Tunnelling Protocol ( same as for UMTS Rel 99): user plane traffic