Planning & Construction Planning & Construction of LTE networksof LTE networks

Jaloliddin BoykulovJaloliddin Boykulov

GSA Mobile broadband reports, April 2011; www.gsacom.com

Instantaneous downlink peak data rate of at least 100 Mb/s within 20 MHz

Instantaneous uplink peak data rate of 50 Mb/s

E-UTRAN optimised for low mobile speed: 0-15 km/h. Higher mobile speed between 15-120 km/h should be supported with high performance. Mobility shall be maintained at speeds 120km/h-350km/h (or even up to 500 km/h depending on the frequency band)

Spectrum flexibility: scalable to operate in 1.4, 2.5, 5, 10, 15 and 20Mhz;

Co-existence with GERAN/3G on adjacent channels: with other operators on adjacent channels: overlapping or adjacent spectrum at country borders: handover with UTRAN and GERAN

LTE is the natural evolution for GSM and HSPA network operators

Re-use of several existing network assets

Deliver new, improved services and applications

With LTE, an operator can achieve a sustainable competitive advantage

LTE also brings a much improved Business Proposition compared to the legacy technologies

Spectrum flexibility: Can use new or re-farmed spectrum, FDD and TDD. Variable channel bandwidth

Highly reliable: Extreme efficiency, Innovation and intelligence which supports a proposition of personalized and quality experience to its customers

• UzACI license on allocation of frequency bands for LTE equipment (in our case 700Mhz, 2.6GHz);

• Resolution of GKRCH on usage LTE equipment in telecommunication networks of Uzbekistan;

• CEMS permission for import of equipment across the border of Uzbekistan;

• Lease contract with Landlord of building/greenfield for installation 2G/3G/LTE equipment;

• Permission from National AirLines for installation of LTE equipment;

• Permission from CSSES (Center of State Sanitary and Epidemiological Surveillance) for installation of LTE equipment with compliance level of the electromagnetic radiation;

• SEMS permission for design, construction & operation of LTE eNode-B;

Access Core Control

W-CDMA BTSRNC

IMS HLR/HSS

2G BTS BSCMSCMGW

SGSN GGSN

LTE BTS (eNodeB)

MGW

MMESAE-GW

• New air I/F providing higher data throughputs• LTE provides flexibility for spectrum re-farming

and new spectrum• LTE can operate in a number of different

frequency bands

• Simplified, flat network architecture based on IP reduces operators’ cost per bit significantly

• Interworking with legacy systems is an integral part of service continuity

• Re-use of existing equipment as much as possible

Improved flexible radio technology Simpler architecture for reduced OPEX

GSM/EDGE/

UMTS/HSPA

LTE / SAES1

TDMA FDMA CDMA OFDMA

f f

f

t

f

tcode

s

f

f

t

f

t

f

• Time Division • Frequency Division • Code Division • Frequency Division• Orthogonal

subcarriers

Multiple Access Methods

• OFDM-based air interface– Symbol length is constant for all bandwidths– 15 kHz subcarrier spacing– Clock is 2N (8x) multiple of 3.84 MHz– 20 MHz = 1200 subcarriers– 10 MHz = 600 subcarriers etc.– Scalability between 1.4 – 20 MHz ( 1.4 / 3.0 / 5.0 / 10 / 20 MHz )

Up to 20 MHz (1200 subcarriers)

15 kHz

frequency

• Improved spectral efficiency• Reduced interference• Very well suited for MIMO

Downlink:

OFDMA

• User multiplexing in frequency domain• Terminals are required to be able to receive up to 20 MHz

but only to transmit up to 10 MHz

IFFT

Terminal 1 Transmitter

Terminal 2 Transmitter

frequency

frequency

IFFT

FFT

FFT

frequency BTS Receiver

MIMO

• Transmit diversity (TxD)-Combat fading

-Replicas of same signal sent on several Tx antennas

-Get a higher SNR at the Rx

•Spatial multiplexing (SM)-Different data streams sent simultaneously on different antennas-Higher data rate-No diversity gain

MIMO

• Transmit diversity (TxD)-Combat fading

-Replicas of same signal sent on several Tx antennas

-Get a higher SNR at the Rx

•Spatial multiplexing (SM)-Different data streams sent simultaneously on different antennas-Higher data rate-No diversity gain-MIMO 2x2, MIMO 4x4

TX RX

Tx RxMIMO

Channel

MIMO• Physical Broadcast Channel (PBCH): The transport blocks are mapped into four subframes within a 40-ms interval and then decoded with no special signaling. This channel is used for correcting mobile frequencies, control channel structure, frame synchronization, and etc.;

• Physical Control Format Indicator Channel (PCFICH): This channel is transmitted in every subframe and indicates the number of OFDMA symbols used for the PDCCH;

• Physical Downlink Control Channel (PDCCH): This channel carries the uplink scheduling information and informs the UE about resource allocation and hybrid automatic repeat request (HARQ) for the paging channel (PCH) and the downlink synchronization channel (DL-SCH);

• Physical Hybrid ARQ Indicator Channel (PHICH): This channel carries the HARQ of acknowledge/not-acknowledge (ACK/NACK) for the uplink transmissions;

• Physical Downlink/Uplink Shared Channel (PDSCH/PUSCH): This channel carries the DL synchronization channel (SCH) and UL-SCH as well as PCH information;

• Physical Multicast Channel (PMCH): This channel carries the multicast information;

MIMO• Physical Uplink Control Channel (PUCCH): This channel carries HARQ for the downlink transmissions, as well as scheduling requests and channel quality indicator (CQI) reports;

• Physical Random Access Channel (PRACH): This channel carries the random access preamble;

Short TTI = 1 msTransmission time

interval

ARQAutomatic Repeat

Request

HARQ

Max. peak data rate **

0

50

100

150

200

250

300

350

HSPA R6 HSPAevo (Rel.7/8, 2x2 MIMO)

LTE 2x20 MHz (2x2 MIMO)

LTE 2x20 MHz (4x4 MIMO)

Mbp

s

DownlinkUplink

LTE performance targets for Throughput and LatencyInitially up to 173Mbps DL, 58Mbps UL and latency of 10-20ms

Latency (Rountrip delay) *

0 20 40 60 80 100 120 140 160 180 200

LTE

HSPAevo(Rel 8)

HSPA Rel6

GSM/EDGE

ms

DSL (~20 - 50 ms, depending on operator)

min max

• LTE handover principles• Lossless: Packets are forwarded from the source to the target• Network-controlled:

Target cell is selected by the network, not by the UE• UE-assisted: Measurements are reported by the UE to the network• Late path switch:

Only once the handover is successful, EPC is involved

MME

UE

ServingSAE GW

old eNB

MME

UE

ServingSAE GW

new eNB

GTP tunnelGTP signalingRadio framesX2 signalingS1 signaling

MME

UE

ServingSAE GW

old eNB new eNB

Before Handover Handover preparationand handover command After handover

MME

UE

ServingSAE GW

old eNBnew eNB

UE access to target, andnew S1 taken into use

GE GE

B8200

B8200

Star Topology

MME/SGW

eNB1

eNB2

eNB3

eNB4eNB5eNB6

High Quality Mobile Broadband Network

R8880 and B8200

R8880 and B8200

– GA: 2010 Q3

– DIMENSION: 88.4x482.6x197mm

(2U, 19inch)

– WEIGHT: < 7.5 Kg

– MULTI-MODE: With Diff. BP Cards

FS

SA

BPLPM

SA CC

CAPACITY

18x20M cells(with 6 BPLs)

POOLING

18x20M cells(3 FS configured)

THROUGHPUT

200Mbps DL75Mbps UL(One BPL)

RRC CONNECTION

3600/eNB

FRONT REAR

180o

– GA: 2010 Q4

– DIMENSION: 420 x 340 x 120 mm (17L)

– WEIGHT: <= 15 Kg

– POWER CONSUMPTION: 336W (Peak)

189W (AVR)

– FREQUENCY: 700/DD/900/1800/AWS/

2.1G/2.6G

MIMO

2T4R2x2 MIMO DL2x4 MIMO UL

OUTPUT POWER

2x40W

BANDWIDTH MODULATION

64 64QAM UL/DL

20 MHz

10 M 10 M

10 M 15 M

Outdoor InstallationIndoor InstallationPowerTrans

Feeder

B8200

SSC

RRU GroundInstallationBBU Installed

In SSC Cabinet

BatteryPowerTransmission

Indoor Macro eNodeBIndoor Macro eNodeB

Distributed eNodeB Distributed eNodeB

FeederFiber

GUL Multi-ModeGUL Multi-Mode

GUL Multi-ModeGUL Multi-Mode

• Three sector site solution 1+1+1– System Module– 3-sector RF Module 3 x 60 W

System Module

3-sector RF

The most cost and size optimized 3-sector configuration

Flexi Multiradio BTS

Just 2 modules for a complete 3 sector WCDMA/LTE SITE!

WCDMA / LTE

System Module

WCDMA / LTE

RF Module

•20%~30% CAPEX Saving •30%~50% Deployment Time Saving

BBUBBU

In Transmission RackIn BTS Rack

On the Wall

On the WallOn the pole

RRURRU

Small size

Flexible deployment

Easy installation & maintenance

BBU in any 19 inch rack

BBU & RRU indoor installed on a standing pole

GSA Evolution to LTE report: May 11, 2011http://www.gsacom.com/downloads/pdf/Global_LTE_commitments_and_trials_List_110511.php

ICT Expo, September 2010

Thank you