CSE5 ITP HIGH DENSITY WIRELESS

DESIGN

ByQaiser Tanveer : 17650920 - Project Manager Sai Shyam Tekumalla : 18046988 - Project Planning and DesignSai Eshwar Chellapuram : 18047717 - Project Site Survey and Implementation

Introduction

• Due to the increase in the number of student logins each day, the university has decided to

deploy a good network as an immediate and future proof network

• On an average, the network should support 4 device per user in two years

• A suitable network without interference, eliminating black spots and supporting heavy loads is

necessary

• The current network at Undercroft cannot address the growing needs of a wireless network. With

this network we won’t be able to provide a good network to all the devices now , let alone in the

future. So, the need to design a new network is of very high priority to address the current

network issues

Project Objectives

• Improve and upgrade the existing wireless network setup

• To provide a suitable bandwidth to various users at different timings that includes peak hours

and off peak hours

• Improve and consolidate network performance and to provide a design with future expansion

capabilities

• Improve the existing network security, redundancy, fault tolerance perspectives to increase

overall efficiency of the network

Challenges …………………..1One of the most challenging factors in the network design of Undercroft building is the

architectural design of the building.

Cannot mount an Access point at this position as it affects the signal strength and the quality of

the overall signal.

Challenges …………………2

There are no APs inside the Undercroft Lecture Theatre. The capacity of the Lecture Theater is 189.

There are only two APs outside the lecture theatre and that is not enough to sustain the growing

demands of the network.

Site Survey ….. For the Undercroft Area

Site Survey ….. For the Undercroft Area

• The data collected is also shown using colored lines and dots

• The survey result depicts the AP coverage across the Undercroft lecture theatre

Access Points – Outside the lecture TheatreSSID:• eduroam• NewToLTU• LTUWireless2• LTUGuest

Bleeding spot

Site Survey – Undercroft Lecture Theatre

Heat Map showing the Signal Strength

• The colors indicate the signal strength from the access points at each

location

• This heat map shows the signal strength in the Undercroft Lecture Theatre

• The legend is across the top of the map. In this case, the units are dBm

since signal strengths are being mapped

Strongest SignalModerate Signal

Weak Signal

Bleeding Spot

Site Survey ….. Value Chart

• From the above value chart, we can infer that, the signal strength at the top left corner is -83.6 dBm, this means the signal strength is poor

• The channels seen support both 2.4GHz and 5GHz range. Noise level is high in all the four cells

• The data rate seen at the bottom right corner is around -69.3 dBm, this is during peak hour and the signal strength does not seem to be great

• Noise levels are pretty high when compared to the accepted levels and that is one major factor affecting the data rates, throughput and the signal strength of that area for all SSID’s

Site Survey ….. APs and SSID

• A list of access points under the SSID eduroam, working both in 2.4GHz and 5GHz range is shown here

• It is not the entire list of access points, only for eduroam, it covers the main idea behind our theory and the inference that we needed to work on our high density design

• Site survey was performed keeping in mind the future network

• The device used to capture the results was the latest surface pro tab, so it was able to capture the statistics for 802.11ac mode.

Estimating Client and AP Count

Assumptions Percentage of Uptake Number of Clients

Maximum capacity 100% 189

Users bringing a Wi-Fi device

99% 187 (Appx.)

Devices connected to the WLAN

>99% 748.44 ~ 750

Active devices >99% 750

• The chance of all 189 attendees bringing a Wi-Fi device, connecting it and transmitting at the same time is almost nil; but there is no easy way to determine what number is likely

• This is further complicated by the assumption the number of devices will increase over time

The maximum number of Wi-Fi devices associated but idle on the network will always be lesser than the number that are active

Attendees will typically use up to a maximum of 4 wireless device at a time

Not all attendees will bring Wi-Fi devices or connect them to the network - estimate 1%

Unless otherwise indicated, more than 99% of these devices are connected to the network at a single point of time

Unless otherwise indicated, more than 99% of all devices that are connected to Wi-Fi are active at the same time

Estimating Clients per AP

Number of associated clients = 750

Estimated number of concurrent active devices = 99% of 750 = 750 approximateRequired throughput per client = 500 Kbps

Latency tolerance = high

RF environment = very high during peak usage

Percentage of retransmissions/loss due to interference = 35%

Estimated throughput per AP radio = 16.7 Mbps

Maximum clients per AP to meet capacity = 33 (16.7Mbps / 500Kbps per client)Number of APs required to meet number of active clients = 22 APs (750/ 33)Total APs for 750 associated devices = 15 (750 / 50)

Seats covered per AP = 13 (189 / 15)

Applications Nominal Throuput

Web access 500KbpsAudio (Pandora, Apple Music, Spotify)

100Kbps

Video (YouTube, Netflix, Skype, FaceTime, Hangouts)

1Mbps

File sharing and Printing 1Mbps

The total nominal expected throughput is 2.6Mbps

Bandwidth requirement per application

Proposed Solution

Proposed Design: Access points inside the Undercroft Lecture Theatre

Proposed Solution – Position of APs

Project Implementation

For the simulation, we are using Riverbed tool which is formerly known as OPNET (Optimized Network Engineering Tool)

• We are creating two scenarios, one with the existing design and one with the proposed design by putting in Access Points (APs) accordingly as a wireless router to transmit wireless signals, various number of work stations according to different scenarios

• The APs is connected to the switch which is then connected to a server which provides applications used for the workstations

• Work stations are associated with the profiles in order to use the applications. This is done by defining applications and profiles by adding a node to each.

Project Implementation

Delay for scenario 1 and 2:

• From the simulation result, we can analyze that the

delay is maximum in the case of scenario 1 which is

when 750 active devices are accessing 2 APs and

minimum in the other case when 750 active devices are

accessing 7 APs

• We can conclude from the performance analysis that

delay increases when the load is high on a single AP

instead when the load is balanced amongst 7 Aps, the

delay seems to be balanced better in the high density

areas of the lecture theatre

Project Implementation

Throughput for scenario 1 and 2

• As the number of workstations increases, the

throughput also increases and it is evident from the

adjacent figure

• The throughput can be monitored by setting in proper

inter packet arrival rate and also modifying the

configurations and operating conditions which affect

the peak throughput performance and efficiency of the

system

Cost Analysis

LineNumber

Item Name Description Quantity ListPrice Extended List Price

1.0 Cisco Aironet 3700e series antenna with external

antenna

802.11ac Indoor AP 7 $3,000.00 $21,000.00

1.0.1 CON-SNT-XXXX License to maintain the 802.11ac Indoor APs

7 $341.59 $2391.13

1.2 Cables CAT6 AP to Switch, Switch to controller, Switch to router

10 $350.00 $3,500.00

1.3 Labour Fixing APs, cables etc 2 $700.00 $1400.001.4 Sai Eshwar Site Survey and Design 1 $3,000.00 $3,000.001.5 Qaiser Tanveer Project Manager and

planning1 $3,000.00 $3,000.00

1.6 Sai Shyam Project design 1 $3,000.00 $3,000.001.7 Miscellaneous In case of emergency   $10,000.00 $10,000.00

      $47,291.13

Indoor wireless for Undercroft

Senior Management

CIO Rasika

NayanajithNetworks Team

Leader

Gareth D’SouzaSenior Network

Security Specialist

Project QSS

Sai ShyamProject planning

and designProject QSSQaiser Tanveer Project Manager

Project QSS Sai Eshwar

Project Survey and Design

head

End UsersSecondary

stakeholders

Prakash Veeraghavan

Supervisor for the project

STAKEHOLDERS

PLANNING (15DAYS)

Project planningDefine project scopeDefine business caseEstimate project schedule

DESIGN (25 DAYS)

AnalysisDesign documentPrototype of design

IMPLEMENTATION (30 DAYS)

Implement the wireless network designTesting

Project Timeline

Thank You