Dimension Ing Mobile WiMAX2

8/8/2019 Dimension Ing Mobile WiMAX2

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Helsinki University of TechnologyDepartment of Communications and Networking

Master's Thesis Presentation

DIMENSIONING MOBILE WIMAX IN THE

ACCESS AND CORE NETWORK

Mwesiga Wilson Barongo

Supervisor: Professor Jrg Ott

Instructor: Jouni Karvo, D.Sc (Tech)


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Mwesiga Wilson Barongo07/10/08 2

Outline

Objectives of the thesis Overview of WiMAX

Comparison of broadband wirelesstechnologies WiMAX network planning Thesis case study

Summary and conclusions


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Objectives of the thesis

Objectives of the study Compare WiMAX with the existing broadband

wireless technologies To dimension mobile WiMAX in the access and core

network Access network: data density requirement analysis, calculating the

required number of base stations, selecting antennaconfigurations, and frequency reuse schemes

Core network: dimensioning nodes and interfaces, quality ofservice provisioning


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Overview of WiMAX

WiMAX technology Broadband wireless technology for fixed, nomadic and

mobile users Promises to provide coverage range of 6 9 kms Data rates up to 72 Mbps for a point to point range of

48 kms Conforms to standard technologies IEEE 802.16d for

fixed broadband and IEEE 802.16e for mobilebroadband


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Overview of WiMAX

WiMAX technology Uses OFDM and

OFDMA as multipleaccess techniques

Uses multiple antennatechnique (MIMO) to

effectively utilise theeffect of multipathsignal

Optimised for theLOS and NLOS

environments


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Overview of WiMAX

WiMAX networkarchitecture

Consists of theentities; Subscriberstation, ASN, andCSN

Consists of thereference points R1-R5 that bind theentities


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Comparison of broadband

wireless networks3G and HSPA

Standards IEEE 802.16-2004/2005 3GPP Release 6 IEEE 802.11 a/g/n

Bandwidth 5 MHz

Multiplexing OFDM(OFDMA) TDM/CDMA CSMA , OFDM for single user

Duplexing TDD, FDD FDD TDD

Frequency 2.5 GHz, 3.5 GHz, 2.3 GHz, 5.8 GHz 800/900/1800/1900/2100 MHz 2.4 GHz, 5 GHz

4.8 9 kilometres 2 5 kilometres 30 300 metres

Mobility average High Low

WiMAX WiFi

Peak downlink

data rate

74 Mbps in a 20MHz with 3:1 DL-to-

UL ratio TDD32 Mbps with 1:1

14.4 Mbps using all 15

codecs; 7.2 Mbps with 10codecs

54 Mbps shared

using 802.11a/g

Peak uplink

data rate

7 Mbps in a 10 MHz using

3:1 DL-to-UL ratio; 4 Mbps

using 1:1

1.4 Mbps initially; 5.8 Mbps

later

1.25 MHz, 3.5 MHz, 5 MHz

7 MHz, 8.75 MHz,10 MHz, and 20 MHz

20 MHz for 802.11 a/g;

20/40MHz for 802.11n

Coverage

range


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WiMAX network planning

Selecting a geographical area where the service isto be offered

Determining the spectrum and channel bandwidth Calculating and determining the parameters: Link budget, antenna configurations, frequency

reuse distances Dimensioning the elements; ASN-GWs, AAA servers,

DHCP/DNS servers, HA QoS provisioning


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Thesis case study

Covers dimensioning of the mobile WiMAXin the three regions;Helsinki (urban), Espoo

(suburban) and Kirkkonummi (rural)Helsinki Espoo

Market segment urban suburban rural

Size 186 sq km 312 sq km 365 sq km

Population 568531 241881 131585

Population density 3057 per sq km 775 per sq km 360 per sq km

Frequency band 3.5 GHz 3.5 GHz 2.5 GHz

Channel bandwidth 10 MHz TDD 10 MHz TDD 10 MHz TDD

Assumed spectrum 30 MHz 30 MHz 30 MHz

Kirkkonummi


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Thesis case study

Users of the service are categorised: Professional users: most demanding business users

High usage users: personal users on regular basis Casual users: broadband users that are connected

few hours in a day Capacity requirements in terms of data

density Urban: 20 Mbps/km2 over 186 km2

Suburban: 1.6 Mbps/km2 over 312 km2

Rural: 0.15 Mbps/km2 over 365 km2


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Thesis case study

Addressing the capacity needs Selected parameters below fulfil the capacity

requirements

Helsinki Espoo

3.22 3.91 4.61

Kirkkonummi

Suitable antenna

configuration

2 2 MIMO with 3:1TDD scheme; data rate25 Mbps DL6 Mbps UL

2 2 MIMO with 3:1TDD scheme; data rate25 Mbps DL6 Mbps UL

1 2 SIMO with 3:1TDD scheme; data rate9 Mbps DL

Adopted frequency

reuse scheme

Universal frequency

reuse scheme

(1,1,3)

Universal frequency

reuse scheme

(1,1,3)

Universal frequency

reuse scheme

(1,1,3)

Frequency reuse

distances


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Thesis case study

Addressing the coverage needs As a result of the link budget calculation:

Helsinki Espoo

Frequency band 3.5 GHz 3.5 GHz 2.5 GHz

1.86 km 2.26 km 2.66 km

Number of base stations 28 31 26

Kirkkonummi

Coverage range persingle base station


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Thesis case study

DimensioningWiMAX network Dimensioning core

network elementsbased on theextended WiMAX

NRM; ASN-GW,Home agents,Firewall, and DHCPservers


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Thesis case study

Dimensioning WiMAX network Based on the end to end traffic model

Subscriber traffic model, subscriber mobility model

Parameter Unit

Subscriptions 80000

powered on subscribers 80%

active subscribers 50%subscribers in sleeping state 20%

subscribers in idle state 30%50%

4%

46%

percentage of subscribers inR6 interface

percentage of subscribers inR4 interface

percentage of subscribers in

R3 interface


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Thesis case study

Dimensioning WiMAX network Basis for dimensioning ASN gateway

Assumed % of subscribers on the interfaces Distribution of the traffic load generated by subscribers over the

interfaces WWW and VoIP traffic treated separately

Interface VoIP traffic WWW traffic

R6 40 Mbps 10 MbpsR4 3.2 Mbps 0.8 Mbps

R3 36.8 Mbps 9.2 Mbps


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Thesis case study

Dimensioning WiMAX network Capacity of the ASN transport link (116 Mbps),

R6, is calculated using the parameters: Number of cells per base station (3) Average cell capacity (31 Mbps) Scaling factor (1.25)

R6bandwidth=number of cells perBSavg cell capacityscalingfactor

Selected QoS classes for the subscribers: Ert-PS: applies to the professional users and high end users BE: applies to the casual users ASN QoS handling is per service flow

Flows are permitted based on the traffic rates specified in theQoS profile


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Thesis case study

Dimensioning CSN elements is based on the nodeperformance parameters:

Home agent: MIP registration rates, binding capacity. MIPregistration rates = powered on subscribers plus % of activesubscribers in the R3 interface. Binding capacity = number ofsubscribers in the CSN

AAA server: database capacity for AAA = # of all subscribers,80,000 for this case study

DHCP server: # of transactions or requests during the busy hourwith respect to its processing capacity

Firewall: total required traffic during the busy hour with respect toits processing capacity


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Summary and conclusions

Appropriate data density requirements analysis isessential for dimensioning mobile WiMAXnetwork elements

Optimising link budget essential for a sufficientcoverage range

Licensed 2.5 GHz band suitable for deployment inthe rural areas

12 SIMO a preferred option for a rural area, and22 MIMO scheme is suitable for the urban andsuburban areas

WiMAX provides operators with the flexibility inselecting the suitable QoS classes


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Dimension Ing Mobile WiMAX2

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