lt e enterprise networks

8/13/2019 Lt e Enterprise Networks

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Move towards LTE Networks in

Public Safety Communication

Team Tiger: Arora, Ashfaq, Avbuluimen,

Kachhwaha


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Agenda

Limitations with current systems (Abhinav)

LTE Introduction (Ozed)

Public Safety LTE Architecture (Syed)

Benefits, Application & Limitations of LTE (Manu)

Conclusion


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Limitations with current systems


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Functional Limitations

Centralize control during natural or human created hazard

Interoperability

Situational Awareness

Speed and precision of decision making process

Operating Cost


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Technical Limitations

Speed

Bandwidth

Throughput

LMT

Architecture

Quality of services

WCDMA

(UMTS)

HDPA HSPA+ LTE LTE

Advanced

Max downlink speed( bps) 384 k 14 M 28 M 300M 1G

Max uplink speed (bps) 128 k 5.7 M 11 M 75 M 500 M

Latency round trip time

(approx)

150 ms 100 ms 50ms

(max)

~10 ms less than 5

ms

3GPP releases Rel 99/4 Rel 5 / 6 Rel 7 Rel 8 Rel 10

Access methodology CDMA CDMA CDMA OFDMA

/SC-FDMA

OFDMA /

SC-FDMA


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LTE Introduction


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What is LTE? LTE (Long Term Evolution) project by 3GPP (3 Generation

Partnership Project) in collaboration between variouscommunication companies.

Evolved from AMPS -> GSM -> UMTS -> LTE

Bandwidth evolution from 20 kHz -> 200 kHz -> 5 MHz -> 20 MHz

Main concepts

Frequency of operation - Lower than other technologies

OFDMAImproves spectral efficiency (ie., 30 users can get signalsthat are all different, so no interference with each other.)

MIMO

boost signal performance IP basedflat architecture helps reduce complexity of base stations


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Comparison of Wireless TechnologiesLTE WiMAX 802.16e

Technology MIMODownlink: OFDMA

Uplink: SC-FDMA

MIMODownlink: OFDMA

Uplink: OFDMA

Peak Speeds Downlink: 100Mbps

(20MHz, 2x2 MIMO)

Uplink: 50Mbps

(20MHz, 1x2)

Downlink: 46Mbps

Uplink: 7Mbps

Duplexing FDD and TDD TDD

Subcarrier mapping Localized Localized and distributed

Subcarrier hopping Yes Yes

Data modulation QPSK, 16QAM, and 64QAM QPSK, 16QAM, and 64QAM

Average user throughput 5 Mbps-12Mbps (downlink)

2 Mbps-5Mbps (uplink)

2Mbps-4 Mbps (downlink)

500Kbps-1.5 Mbps (uplink)

One-way airlink latency 15ms 50ms

Bandwidth 20MHz, 15MHz, 10MHz, 5MHz,

3MHz, and 1.5MHz

3.5MHz, 5MHz, 7MHz, 8.75 MHz, 10

MHz

Spectrum LTE can be deployed using

various frequencies. In the US, a

number of carriers use 700MHz

which helps increase in-building

coverage for wireless signals;

2.3,2.5.3.5, 5.8 GHz

Mobility Targeted Mobility up to 350kmph Targeted mobility up to 120kmph


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LTE Worldwide Coverage


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Public Safety LTE Architecture


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Network Architecture Evolution

High Level Overview. Not all functional elements and

interfaces are shown


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LTE functional comparison to Wimax

or 3G 3G based on RAN and CN

RAN (Radio Access Network) aka base station (NodeB) controlled by Radio

Network Controller (RNC)

CN (Core Network) packet data subsystem is connected to internet, and circuit

switch subsystem is connected to telephony networks like PSTN (Public switch

telephone networks).

Functional changes compared to the current UMTS architecture

The main principles and objectives of the LTE-SAE architecture include :

A common anchor point and gateway (GW) node for all access technologies

IP-based protocols on all interfaces;

Simplified network architecture

All IP network

All services are via Packet Switched domain

Support mobility between heterogeneous RATs, including legacy systems as

GPRS, but also non-3GPP systems (say WiMAX)


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High Level PS LTE Solution

Overview


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eMBMS

Introduced for WCDMA (UMTS) in Release 6

Supports multicast/broadcast services in a cellular system

Same content is transmitted to multiple users located in a specific area

(MBMS service area) in a unidirectional fashion

MBMS extends existing 3GPP architecture by introducing: MBMS Bearer Service

delivers IP multicast datagrams to multiple receivers using minimum radio and network

resources and provides an efficient and scalable means to distribute multimedia content to

mobile phones

MBMS User Services

streaming services - a continuous data flow of audio and/or video is delivered to the users

handset download services - data for the file is delivered in a scheduled transmissiontimeslot


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eMBMS

Multimedia service can be provided by either: single-cell broadcast or

multicellular mode (aka MBMS Single Frequency Network (MBSFN)

In an MBSFN area, all eNBs are synchronized to perform simulcast

transmission from multiple cells (each cell transmitting identical waveform)

If user is close to a base station, delay of arrival between two cells could be

quite large, so the subcarrier spacing is reduced to 7.5 KHz and longer CP

is used

Main advantages over technologies such as DVB-H or DMB: no additional infrastructure

operator uses resources that are already purchased

user interaction is possible


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eMBMS

MCE coordinates the synchronous multi-cell

transmission The MCE can physically be part of the eNB ! flat

architecture


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Benefits, Application & Limitations of

LTE


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Benefits of LTE in Public Safety

Unified Communications

Infrastructure

Ecosystem of Devices

Interoperability

Situational Awareness Video

Digital Imaging

Large Data Files

GIS

Automatic Vehicle Location

Computer-Aided Dispatching

Access to Report Management

Systems

Telemetry/Remote Diagnostics

Bulk File Transfer Decreased narrowband channel

load

Enhanced day-to-day operations

Improved incident operations


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Public Safety Application

License Plate Reader Fingerprint Identification

Facial Recognition, Scars, Marks, and Tattoos

Local, State, Federal Data

Child Abduction Leads Tracking

Multi-vital sign patient data transmission


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Key Players offering LTE for Public

Safety AT&T and Harris Corporation

CHICAGO, October 24, 2011AT&T and Harris Corporation (NYSE:HRS) are forming an alliance to develop and

deliver next generation LTE wireless solutions for agencies and first responders whose lifesaving efforts depend on

timely access to critical information.

Alcatel-Lucent & EADSThe joint solution from Alcatel-Lucent and EADS will provide a standards-based holistic communications infrastructure,

along with the devices and applications necessary to deliver interoperable broadband and narrowband mission critical

communications.


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Public Safety LTE Limitations

No standard

No direct mode

Low power results in less coverage

Lack of devices

Challenge for LTE to provide coverage where LMR does

Exposure to security infiltrations


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Conclusion

Todays public safety networks need to provide interoperability across

multiple locations and disciplines, along with secure, reliable support

for mission-critical services.

In addition, they must have the capacity to support emerging public

safety applications, such as video, digital imaging, remote database

access and messaging.

These capabilities can accelerate response times when emergencies

occur, improve situational awareness and play a vital role in planning

and decision making.

Technology does not need to be invented, only tailored to meet the

needs of public safety.


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Thank you!!

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