International Journal of Interactive Mobile Technologies (iJIM) – eISSN: 1865-7923

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

Implementation and Analysis of a Smart Team

Management System using iOS Devices as iBeacon

https://doi.org/10.3991/ijim.v14i03.11680

Sindhumol S.

Cochin University of Science and Technology, Kochi, India

[email protected]

Abstract—A cost-effective smart team management system using iOS de-

vices as iBeacon for better task monitoring and presence detection is proposed in

this work. It is designed to maximum utilize the proximity information offered

by iOS devices through iBeacon integration. In addition to this positioning ser-

vice, iOS core location framework, and push notification features are included to

create a productive environment in an organization. Along with the employee

tracking and task monitoring features, the proposed application provides the typ-

ical project management services like task allocation and notification, instant

chat, status report, and employee log. On entering the iBeacon range, daily task

details and announcements from all associated teams will be available in team

member devices. The system is connected to a server for productive team man-

agement, and peer to peer communication is utilized for instant exchange of in-

formation. An experimental evaluation to study the effect of interference, obsta-

cles, and measured power on received signal strength and accuracy of the pro-

posed iBeacon is also conducted. The observed results positively recommend the

proposed app as an efficient iBeacon application for team management.

Keywords—Team management, iBeacon, Core Location, iOS Application

1 Introduction

As technology grows faster, organizations and offices are also on the path of digital

transformation, utilizing technologies like social media, mobile apps, big data, cloud

computing, Internet of Things (IoT), etc. [1] [2]. But this digital revolution raises chal-

lenges in leadership, marketing management, process management, and project man-

agement. Team leaders and group leaders are struggling hard to track the activities of

their team, or they often fail to keep the project deadline and budget. A recent survey

report on project performance from 2011 to 2018 [3] says that nearly half of the projects

are not completed on time owing to the poor task management and collaborative sys-

tem. According to [4], task management apps can boost productivity through a collab-

orative work management culture among team leads and members in the office. Stand-

ard task management software features like daily reports, alerts, ethical employee track-

ing, and work monitoring has a significant role in achieving this. The success and reli-

ability of the software depend on the technology used in application development. The

128

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

widely accepted outdoor localization technology, Global positioning system (GPS) and

geofencing [5] are proved to be very useful in task management applications. But they

failed to be helpful in indoor environments for micro-location management. RFID and

other technologies were also used in location management and team coordination [6],

but the requirement of additional hardware devices and accessibility issues affected its

popularity. In the last five years, Bluetooth Low Energy (BLE) beacons [7] replaced

many of these existing technologies, with some exciting applications like indoor posi-

tioning, proximity detection, activity monitoring, etc. Beacon market could please the

customers and users with a perfect blend of a digital and business user experience [8].

BLE beacons were introduced as a cost-effective method for indoor location manage-

ment that provides low production cost, easy deployment, and better accessibility. The

main advantage of the BLE beacon is, it can be attached to nonstationary objects also

because it is estimating only the proximity (relative distance to an object), not the exact

location. A detailed literature review on BLE applications in IoT is available in [9]. In

2013, Apple Inc. introduced the BLE protocol standard, iBeacon, to communicate with

iOS devices [10]. Since then, other vendors also entered the market with iBeacon com-

patible devices. iBeacons are now compatible with Mac machines (with OSX Maver-

icks and later), iPad mini or later, iPhone 4s or later, android 4.3+, and windows phone

devices. Also, there is an option to turn the iPhones, iPads or BLE compatible devices

to an iBeacon through iOS Bluetooth Framework and Core Location framework [11].

In this work, the facilities provided by iBeacon, iOS location mapping, geofencing,

and push notification are best utilized to propose an iOS application for smart team

management. Compared to the existing team management applications, the proposed

app completely avoids the installation of stationary physical beacons by turning team

members’ iPhone or iPad into iBeacons. At the same time, it integrates all the facilities

provided by the physical beacon with the team management features in a single iOS

application. It is implemented particularly for one team, where the team leader and em-

ployees have separate login access and ID for accessing the tasks. Once the connection

with the login server is established, the team leader can view the active members, add

more employees, set the task, view the status, chat, and see the employee log and so on

from the dashboard. The complete system is connected to a server to provide better

communication among the team members. Peer to peer communication through push

notifications and chat also added to the system. A team member is allowed to view the

assigned tasks, notifications, and active colleague list. The proposed app provides an

employee log that summarizes the employee entry and exit in the beacon range as well

as his performance in the task completion. It also facilitates a smart employee tracking

through automatic presence detection, thereby avoiding long queues for swiping or

punching. In this work, both user and team lead can enable iBeacon broadcasting, and

with the help of push notifications, one can wake another inactive app. A feasibility

study on turning iOS devices into iBeacon for team management is also conducted. The

performance of the proposed app on varying beacon ranges and different measured

power was observed. Effect of interference from other beacons in proximity variation,

and received signal strength variation in the presence of different obstructing objects

were added in the experimental study. Results of the exploratory analysis and software

iJIM ‒ Vol. 14, No. 3, 2020

129

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

testing positively recommend the proposed system as a reliable and acceptable applica-

tion for typical office environment.

The remaining sections of this paper are organized as follows. Section 2 discusses

the recent related works in beacon proximity applications and project management.

Section 3 gives an overview of iBeacon architecture and implementation details of iOS

devices integration as iBeacon. Proposed app design and architecture are also added to

this section. Section 4 explains the app implementation and screenshots. The experi-

mental results of the proposed iBeacon are analyzed and discussed in Section 5. Section

6 concludes the paper with an insight into future work.

2 Related Works

BLE beacons, with its proximity services, confirmed its position in almost all do-

mains, including retail, finance, healthcare, education, automotive, etc. In retail appli-

cations, BLE beacons in a store are connected with the shopping app installed in cus-

tomer phones. Retailers correctly identify the location of the customers and send them

relevant information and promotions [5]. The main challenge in this implementation is

turning Bluetooth on and making their app active [12]. Apart from retail applications,

banks [12], airports [13], hospitals [14], hotels, and companies are now extensively

using these beacons for different services like employee tracking, cab services, confer-

ence alerts, etc. iBeacon and BLE beacons are found to be useful in learning and teach-

ing also [15][16]. BeaLib is a smart app [17] providing quick and easy access to users

having smartphones. Without using an internet connection, the library user gets the

necessary information on the mobile app. In [18], an in-room presence detection system

is introduced to automate the attendance collection of conferences or courses. There are

several works related to smart office management using mobile apps available in recent

works [4][19]. Asana, Microsoft planner, Trello, Wrike, Smartsheet are a few popular

apps [4] among them. The beacon specific features in indoor positioning made it ac-

ceptable in app-powered office management systems also. SOEMS [20], is a BLE bea-

con-based system with a mobile app to reduce energy consumption in the office without

causing user inconvenience. The power-saving mode of the user’s PC, lights, and fans

are automatically controlled on user entry and exit. Beacons in an office can ease the

coordination of group work or teamwork with the support of smartphones and apps. In

AllHours App [21] daily work schedules of employees are maintained by passing

through a fixed micro-location known as “check-in” location where beacon is installed.

StaffNearBy[22] is another application using Beacons for attendance management, em-

ployee tracking, crew safety management, and location-based information sharing. DE-

TASK [23] is an android app for task management using Firebase. It provides task

management features like user creation, location tracking, beacon management, and

task management. To work with DE-TASK, admin mounts the beacons in office prem-

ises for different departments, and assign the tasks to the user after selecting beacon. A

lot of employee tracking and task management apps are available in App Store and

Google play store. But they are not completely dedicated to integrated team manage-

ment. Either they provide some proximity related services, or maybe they are based on

130

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

separately installed iBeacons. These limitations are well addressed in the proposed app

through the implementation of an iBeacon integrated team management system.

3 iBeacon Architecture and iOS Integration

iBeacon technology was introduced by Apple Inc. in iOS 7[10], as a BLE based

protocol enabling location awareness around an object (can be static or moving). iBea-

con can be considered as a subset of BLE beacons, providing automatic and location-

specific services using mobile apps [24]. iBeacon technology involves hardware and

software parts [25]. Hardware device consists of a wireless transmitter and a smart de-

vice for BLE transmission. The software part, a smartphone app, is used to analyze the

received message and invoke the relevant actions. iBeacon transmitter advertises a

stream of messages at a regular interval of time, and the receiver detects it based on the

proximity of the device [26]. In contrast to the android devices, iOS devices regularly

search for the iBeacon signals, and the app becomes active when the device is in iBea-

con proximity. Any smart device having a BLE receiver can receive iBeacon message

from a separate iBeacon hardware, or iOS device turned into iBeacon [27]. The range

of beacon transmission depends on location and obstructions in the beacon range.

Standard beacons often show a range of 70-100meters, whereas long-range beacons

transmit up to 300 meters.

3.1 iBeacon message structure

Fig. 1. iBeacon payload format

An iBeacon architecture, as shown in Figure 1, defines the information with the pre-

fix, UUID, major and minor value, and transmission power (Tx)[10]. An iOS device

can use a single UUID to represent the entire organization. The major number groups a

related set of beacons and minor number distinguishes the individual beacons. Suppose

an IT firm has offices in U.S, Japan, India, and each office have different teams like

product team, development team, and testing team, iBeacon architecture can be config-

ured with the same UUID for IT firm, different major values for different locations, and

same minor value for a particular team as shown in Figure 2.

iJIM ‒ Vol. 14, No. 3, 2020

131

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

The dotted rectangle in Figure 2 shows that minor values are common to a particular

team in all locations. For example, minor1 is assigned to the product team from all three

offices. Perhaps the employee is associated with the development team in the US; the

beacon configuration can be set as UUID+Major1+Minor1. This distribution makes it

easy to distinguish the team beacons from one another. The proposed app follows the

same distribution in its architecture, and it provides the option to decide the granularity

to the organization or team, which can be configured at runtime. More details on UUID

generation and iBeacon settings in this work are explained in section 3.3.

Fig. 2. iBeacon distribution among different teams

3.2 iBeacon performance measures

Received Signal Strength Indicator (RSSI), Positioning Accuracy, Proximity, Meas-

uredPower (Tx) are the measures used in the beacon performance analysis of this work.

RSSI is defined as the received signal strength in decibels measured from one meter

away from the iBeacon. The positioning with RSSI estimates the receiver position

through the measurement of received BLE signal intensity [28], which can be varied

according to the signal attenuation from the environment. Positioning accuracy is a

measurement based on an estimated position compared to the actual position [26]. It

can be varied according to the signal loss in the propagation path. The capacity of the

receiving antenna, characteristics of the transmitter and the environment, interference

from other wireless devices and beacons, and room layout can affect the received signal

strength and thereby accuracy or proximity calculation. Several positioning accuracy

estimation algorithms exist in the literature [25][26][28]. In this work, accuracy values

are measured in meters from a variable returned from the iOS framework. Proximity

values are categorized into ‘Immediate’, ‘Near’, ‘Far’, and ‘Unknown’ based on the

received accuracy. It is only an indicator to show the relative position of the device

around the beacon. Another measurement used in this work is the Measured Power or

Transmit Power (Tx) as specified in the iBeacon message structure [24]. Measured

power in iBeacon represents the signal strength of the beacon for a receiver at one meter

132

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

away. Measured power is often set by the manufacturer as a pre-configuration parame-

ter. However, as a part of calibration at the time of iBeacon installation, it can be ad-

justed to overcome any attenuation in a cabinet, or to compensate with the reflections

against a metal frame or Wi-Fi interference. Range of Transmit Power values and set-

tings vary in different beacons; a detailed explanation is available in [24]. It is different

from the transmitted power, the capacity of the transmitting device. The article [29]

explains how to choose the transmitted power to prevent the region overlapping. iBea-

con uses the 2.4 GHz BLE to broadcast signals. So, signal loss due to physical objects,

human body, and obstacles like walls, doors or other physical structures has to be con-

sidered at the time beacon installation. A detailed experimental analysis of all these

cases is discussed in section 5.

3.3 iOS device integration to iBeacon

In proximity applications, usually dedicated iBeacon hardware is used along with

mobile apps. According to Apple iOS documentation [11], any iOS devices that sup-

ports BLE can be turned into an iBeacon using the iOS frameworks like Core Location

and Core Bluetooth. Three main steps exist as per documentation to change an iOS

device into an iBeacon transmitter.

 Step1: Generate a 128-bit UUID for the device to uniquely identify an item or or-

ganization. In iOS, the NSUUID class is used to handle the UUID values. Terminal

Mac app in Mac machines can be used to generate one UUID. In the Terminal win-

dow, type ‘uuidgen’ and press return. The generated UUID value will be a hexadec-

imal value of 4 sections, for example, ‘D2B5-45B9-86F0-765531FFA8B7’.

 Step2: Use the UUID value from Step1, and set a major and minor value as discussed

in Section 3.1 to create a CLBeaconRegion object representing beacon ID.

 Step3: Configure the iOS device as a Bluetooth peripheral using CBPeripheral-

Manager class from the Core Bluetooth framework, the code snippets are available

in iOS documentation [11]. Start beacon data streaming to other devices in the short-

range region. Here, Bluetooth hardware part in the device is utilized to broadcast the

information.

In addition to UUID, major, and minor value, peripheral data provides a parameter

‘withMeasuredPower’ to represent Tx value. By default, it is set to ‘nil’, specifying

default measured beacon strength from one meter away. iOS Core Location framework

provides CLLocationManager class to work with beacons; startRangingBeacons

method returns CLBeacon instance that identifies an array of beacons within the device

range and startMonitoring method registers a beacon to the device for ranging. iBeacon

details like UUID, Major, Minor, and performance measures like accuracy, proximity,

and RSSI can be collected from CLBeacon instance in the iOS framework. For a par-

ticular app, there is no restriction for beacon ranging, but monitoring is restricted to

maximum 20 regions.

The proposed app follows the same steps to turn the team device and member iPh-

one/iPad to iBeacon. After a successful login, the array of beacons in the device range

is identified by the startRangingBeacons method. When the device is wakened, it pings

iJIM ‒ Vol. 14, No. 3, 2020

133

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

the all registered beacon even if the app is closed and generates a notification to make

the app active or open. In this work, these wakening up can be done in two ways; users

and team leaders have the option to turn their device into iBeacon, and both ends can

send push notifications. The proximity of the device can be categorized into:

 Immediate (< 1 meter) – showing the physical device in its close range.

 Near (1-3 meter) – If there are no obstacles, and the receiving device is set on a

direct line of sight from the transmitter, 1 to 3 meters will be the range. Otherwise,

the actual 1-3 meter will show different proximity. A detailed discussion is available

from Section 5.

 Far (> 3meter) – In the ideal condition, it is higher than 3 meters, actual values may

change according to the variation in RSSI.

 Unknown – This is the value shown, either before monitoring starts (initially) or

when the beacon is not active or out of range.

3.4 The architectural design of the proposed app

Fig. 3. The architectural design of the proposed app

The proposed team management app launches with an option to login as Team Lead

or User (Employee) as shown in Figure 3. Successful Team Leader Login navigates to:

 View the active members

 Task View with status

 Set the new task by choosing employee individually or by group

 Chat with employee/Send notifications to members

 Set the TeamID/UUID

 View the employee log (with entry and exit time, task report)

134

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

 Log out option

User Login navigates to:

 View the active members on the home screen

 View assigned task from team leader/s

 Chat with team leader and colleagues

 Send a request to the team leader for acceptance/awake

 Log out option

The design phase of a mobile app starts with a prototype design, which outlines the

different screens of the proposed app and its navigation from one screen to another.

Also, it involves the design of the page layout, interface elements, and workflow. There

are different methods of prototyping; the Wireframe model [30] is the basic one; tools

like JustinMind[30] are also available for the prototype design. In this work, the app

framework including screen prototypes and navigation as specified in Figure 3 were

first designed with JustinMind before starting iOS implementation.

4 Implementation of Proposed App and Output Screens

4.1 Software and hardware components

The complete development and implementation of this app were performed using

Macbook Pro with Intel Core i5 2.7GHz Processor, 8GB RAM, and macOS Mojave.

XCode version 10.2.1 with Swift 5 [31] provided the software development environ-

ment. Screens and layouts were designed using Storyboard [31], and the business logic

was implemented with Swift programming language and backend services. The data-

base in this app used the Core Data framework and SQLite for the implementation of

backend services. Communication with the server was implemented using AlamoFire

[32], which provides a chain of request/response methods and JSON parameters. The

security keys used in this work for accessing location and allowing notifications were

stored in info.plist of the XCode project[31].

4.2 App screen implementation and screenshots

The relevant screens from the implemented app are shown in Figure 4(a) to Figure

4(h). In addition to these pages, screens like a chat window, new registration, settings,

employee log, forgot password, logout, etc. also exist in the implementation. The app

launches with the main screen as shown in Figure 4(a), where the user can choose be-

tween User or Team. Here a segue action [31] for both the user and team leader is

created to invoke the corresponding login page.

or forgot password. Successful login directs to the Home page. Entering the wrong cre-

dentials denies login to the app. ‘Forgot password’ button leads the user to a FORGOT

iJIM ‒ Vol. 14, No. 3, 2020

135

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

PASSWORD page, where he can give the email address to which the new password is

to be sent. ‘Signup’ button leads to the new registration page.

Home screen: Home screen, shown in Figure 4(c), can be reached either by a suc-

cessful login as a team lead or from the side navigation after login. It is the main screen

of the proposed app where the current proximity status of the members is shown. The

table view displays the team member list with dynamic cells having Image view, two

Text fields, and a Search bar. The proximity status of each member is shown at the right

end of the row.

Side navigation: Figure 4(d) shows menu items like Home, View Task, set UUID,

Chat, Employee Log, Log out on the left edge of the screen. It is hidden most of the

time, but it is revealed when the user swipes from the left of the screen or when the user

touches the app icon at the top left.

(a)

(b)

(c)

(d)

136

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

(e)

(f)

(g)

(h)

Fig. 4. Output Screens: (a) Main Screen, (b) Login Screen, (c) Home page, (d) Side Naviga-

tion, (e) Task view, (f) Task management popup, (g) New Task Screen, (h) iBeacon

Settings

Task view: As given in Figure 4(e), team tasks are listed out in a Table view with

details like task description, assignee, and status (In progress, redirected, canceled or

completed) in each row. The team lead can search for various tasks listed in the table

view. Team members can be selected (as a group or individual) to assign a new job for

them. The selection of a row shows a button(arrow) on the right end of the row to popup

an action sheet to create a new task or manage the existing one, as given in Figure 4(f).

New task: This option, as shown in Figure 4(g), can be used to write and assign a

new task with its deadline to a team member. While pressing ‘return’, the new task will

be saved to the existing task list, and a notification will be sent to the selected user/users.

iBeacon settings: This is a unique page for the team lead, to set member ID as UUID

with major/minor values to get connected with the team, see Figure 4(h). It follows the

naming structure as described in section 3.1. Team Lead is in control of setting all these

fields through this screen.

iJIM ‒ Vol. 14, No. 3, 2020

137

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

(a)

(b)

(c)

(d)

Fig. 5. User side iBeacon list and notifications: (a) Registered iBeacon (b) iBeacon details (c)

Adding new iBeacon (d) Notifications

As per the design of this app, users are allowed to connect with more than one team

through iBeacon. Users can configure their iPhone/iPad using the ID assigned by the

team lead for BLE signals transmission as an iBeacon. Also, the user can search for the

ranging teams connected to him. To enable these features, the user should provide lo-

cation access and notification permission to the app on activation. A successful login

navigates to a beacon page displaying all the connected teams like DvpmtTeam and

TestTeam as shown in Figure 5(a). Each row displays the team name, current proximity,

and accuracy of the user relative to iBeacon. Double click on each row gives iBeacon

parameters as shown in Figure 5(b) using an alert in iOS. The user is equipped with an

option to add more teams with new beacon settings to the list, as displayed in Figure

5(c). Once a beacon is registered to the user app, all notifications on entry and exit of

that beacon range are pushed to the user as shown in Figure 5(d), even though the app

is not active or not in the foreground.

5 Analysis of iBeacon Accuracy in the Proposed App

Performance analysis of turning an iOS device into an iBeacon in different environ-

ments are discussed in this section. MacBook Pro with Intel Core i5 2.7GHz Processor,

8GB RAM and macOS Mojave, iPhone 6s, iPhone SE, and iPad mini4 were used in the

testing and analysis. Observations were manually recorded; for each location, 10 con-

sistent RSSI and distance measurements were taken at a time, and the average value

was recorded. Four sets of experiments were conducted in the performance evaluation.

The first one was the study on variation in accuracy values against the actual distance.

The second experiment evaluated the effect of signal interference on proximity and

accuracy. RSSI and Accuracy changes on varying MeasuredPower (Tx) were consid-

ered in the third set. The fourth set was a study on the effect of obstacles like cardboard,

138

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

human body, etc. on accuracy variation. Details of each set of experiments are discussed

in the following sections.

5.1 Effect of actual distance change on accuracy values

Experiments to study variation in accuracy values (here, measured in meter using

iOS SDK) in an ideal situation as well as in an environment with obstructions are dis-

cussed in this section. Devices turned into iBeacon were placed at a table height of

80cm, facing the transmitter on a straight line with the receiving end. Actual distance

varied from 1m to 20m to collect the experimental accuracy values. Table 1 summarizes

the observed results.

Table 1. Accuracy variation against actual distance

Actual Distance

(m)

Accuracy (m) (Without obstructions)

Accuracy (m) (with obstructions)

1.03

1.93

3.08

3.92

4.5

4.6

8.89

4.9

15.8

6.11

7.18

8.33

10.53

16.15

23.4

76.5

The first column represents the actual distance values, with a straight line of sight

from iBeacon to receivers. Observed accuracy values without any objects on its propa-

gation path are tabulated in the second column. The third column represents the values

in a real environment with walls and doors, where signal strength changes could be

observed only from 4.5 m to 20 m. From these results, it is observed that initially, there

is not much difference exist between actual distance and measured accuracy. From an

actual distance greater than 6m, accuracy values are found to be deviating from the

expected value. For actual distance 4.5m, the difference was approximately 0.1m,

whereas, for 20m, the gap increased to 3.4m. While considering the observed results

with obstructions, it is found that accuracy values are multiple times the actual distance.

A drastic increase in accuracy value observed on increasing actual distance. For the last

two values, 15m and 20m, there was a wall and a wooden door on the line of sight while

taking the measurements. Signal strength decrease and accuracy change due to obsta-

cles, as discussed in section 3.2, are evident from the corresponding accuracy devia-

tions, 53m, and 56.5m respectively. The observed results confirm that positional error

(the difference between the expected value and obtained result) increases as the distance

of the receiver from iBeacon increases.

iJIM ‒ Vol. 14, No. 3, 2020

139

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

5.2 Effect of interference on accuracy and proximity

Fig. 6. iBeacon accuracy variation in the proximity of another iBeacon

The proposed app may generate interference on iBeacon transmission through a sim-

ultaneous activation from multiple users. The second set of experiments in this work is

dedicated to a study on the variation in accuracy and proximity due to signal interfer-

ence. The experimental values of these performance measures were collected in a real

environment, having WI-FI, and the presence of other mobiles. One iPhone SE and

iPhone 6s were placed at a table height of 85cm, without having any obstructions from

walls or other objects on the line of sight. Accuracy values were manually recorded

from the immediate neighborhood to 8.5m. Another iPhone 6S was used as the receiver.

When the receiver was very close to both beacons, received accuracy values were al-

most same, as shown in Figure 6. For .5m to 1.5m, slight deviations from actual distance

plotted for accuracy values from both beacons. After 2.5 m, accuracy values from iBea-

con 2 found to be keeping a consistent variation from actual distance, whereas iBeacon1

accuracy values are highly fluctuated, especially after 4.5m. These fluctuating results

show that signal interference from other devices and iBeacon has a significant role in

adversely affecting the iBeacon performance, especially when distance from beacon

increases in a real environment.

5.3 Effect of measured power variation on RSSI and proximity

As mentioned in section 3.2, Measured power value causes the receiver to change

its proximity calculation so that accuracy ‘1m’ is measured when the receiving RSSI is

same as the sent Measured power value. The variation in Measured power values in

different experimental environments are explicitly described in this section. At the time

of the beacon calibration, the receiver should be placed at ‘1m’ in a typical direction to

receive the signal over 20-30 seconds. Consistent RSSI value will be considered as the

Measured power to be set in the iBeacon device.

140

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

Table 2. Effect of Measured Power variation on proximity and accuracy

Measured Power(dB)

RSSI (dB)

Proximity (Accuracy in meter)

Default

-57

Near (1.03)

-120

-57

Immediate (0.17)

-110

-58

Immediate (0.19)

-100

-57

Immediate (.20)

-90

-58

Immediate (.22)

-80

-58

Immediate (.28)

-70

-59

Immediate (.32)

-60

-59

Immediate (.99)

-50

-58

Near (2.91)

-40

-58

Far (5.24)

Table 2 describes this calibration, using an actual distance of 1m. In this third set of

experiments, ‘MeasuredPower’ changes from -120dB to -40dB at an interval of 10dB.

Default value also recorded; as per iOS settings its value is ‘nil’ by default. All the

measurements were taken in an ideal situation avoiding all interferences and obstacles.

iPhone SE was set as iBeacon, and iPad mini 4 was the receiver. Experimental results

show that accuracy 1.03m and proximity ‘near’ is recorded for default RSSI value, -57.

It can be seen from Table 2 that when ‘MeasuredPower’ is set as -120, RSSI is same as

the default value. But, proximity is shown as ‘Immediate’, with an accuracy value of

0.17m. The receiver identified the relative position as very close to the beacon. The

same phenomenon repeated for all values from -110 to -60, with accuracy values grad-

ually increasing. For Measured power -60(close to default value), it is found that accu-

racy is .99m (close to expected 1m). i.e., when the receiver has better RSSI than the

Measured power, its proximity is noted as closer or immediate. When Measured Power

tends to its default value, proximity and accuracy also tend to actual distance, ‘1m’.

When RSSI exceeds Measured power, the receiver estimates it as a position far away

from the iBeacon since it is receiving weaker signals. These results are supporting the

general theory, and positioning constrained explained in section 3.2, i.e., proximity es-

timation by receiver varies with the change in Measured Power value. This performance

measure is beneficial in configuring the iBeacon in a cabinet with interference or ob-

structions. For example, if the receiver is showing accuracy 2.91m (as in Table 2) at an

actual distance of 1m, its ‘MeasuredPower’ is to be set to a lower value than -58dB.

5.4 Effect of obstacles on accuracy and RSSI

The fourth set of experiments in this work was aimed at the evaluation of the effect

of objects on the line of sight from iBeacon to the receiver. The transmitter was placed

at the height of 1m from the ground, and the receiver is held on the same line of sight

facing the transmitter. The observed values, RSSI and accuracy, were recorded from

1m to 7m at a gap of 1m. The experiments were started with an ideal environment

having no interference, and repeated by placing iBeacon in a cardboard box and ob-

structing the direction of sigma line with a human being at less than 1 m from iBeacon.

These experiments were first conducted with an iPhone SE as iBeacon1, and repeated

iJIM ‒ Vol. 14, No. 3, 2020

141

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

with iPhone 6s as iBeacon2; in both cases, the receiver was set as iPad mini 4. The

observed values are summarized in Table 3; for each case, values are tabulated as RSSI

value with accuracy in the bracket.

Table 3. Effect of obstructing objects on RSSI and Accuracy

Distance

(m)

Without

Obstructions

Placing iBeacon in a Card-

board box

Human-being on line of sight

RSSI(Accuracy)

iBeacon1

iBeacon2

iBeacon1

iBeacon2

iBeacon1

iBeacon2

-56(1.03)

-56(1)

-60(1.65)

-60(1.62)

-61(2.16)

-63(2.6)

-59(1.56)

-58(1.12)

-61(2.12)

-62(2.34)

-68(4.39)

-67(4.25)

-62(2.15)

-60(1.65)

-65(3.2)

-64(2.85)

-74(9.15)

-72(7.1)

-66(3.58)

-65(3.14)

-68(4.54)

-69(4.9)

-81(15.2)

-80(16.17)

-69(5.23)

-69(5.12)

-74(8.3)

-73(8.58)

-71(7.3)

-73(9.93)

-62(2.22)

-62(2.4)

-68(4.77)

-66(3.45)

-75(8.24)

-72(8.13)

-63(2.49)

-58(1.6)

-65(3.25)

-65(3.15)

-69(4.43)

-69(5.33)

RSSI values and accuracy values were observed to be changing due to room layout

change, as summarized in Table 3. Accuracy results show significant variation from

the actual distance after 5m in all cases. These experiments were conducted in a corridor

with a thick brick wall on one side up to 5m, which expands to a more spacious location

after that. Another observation is that even though iBeacon was completely enclosed in

a cardboard box, no significant change observed in RSSI and accuracy values. The third

case of this experiment was human intervention. As discussed in section 3.2, path loss

due to signal block is evident from observed results, with a drastic decrease in RSSI

and corresponding error increase in accuracy. For iBeacon1, direct RSSI at 4m was -

66, whereas it is changed to -68 for case 2, and -81 for situation 3. The similar variation

observed in the case of iBeacon2 also.

5.5 Discussion

It is clear from the literature and experimental results that beacon ranging varies

according to the change in room layout, interference, beacon height, and obstacles.

Proximity follows an inverse-square relationship [33] between distance and signal

strength. The experimental study justifies all these general constraints with the meas-

ured values. iBeacon is a one-way transmit device. It cannot receive the signals from

the iPhone or other devices. To provide two-way communication, the sender and re-

ceiver in this app are provided with a BLE transmission facility, even though the threat

of the interference and erratic measurements exists in the environment. Restricted or

optimized usage of the devices in an office environment can solve this limitation to

some extent. In a typical hardware beacon, there will not be any internet connection,

and beacon ranging is available only when the connected app is in foreground. In con-

trast to this, the proposed app as a single suite provides integrated internet services like

geofencing, chat and push notifications, along with proximity services. In the case of

142

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

communication disruption among team leaders and members, mutual alert mechanisms

through push notifications can be used to wake up the other device.

The major limitation of the proposed app is battery drainage while keeping the app

active all the time in the foreground. In regular use, around two years of battery life can

be expected for an iBeacon due to its low power consumption. However, it depends on

transmit power and notification interval [7][33]. Optimized and restricted usage of the

app, as discussed earlier, is applicable in the context of battery saving also. Since the

main focus of this app was iBeacon integration, only the bare minimum team manage-

ment services were included in it. In future developments, additional features like video

chat/conference, file sharing, presentations, meeting minutes, inter-team communica-

tion, etc., can be added without affecting the app complexity.

6 Conclusion

A smart device based team management application to provide a better environment

for team communication and task monitoring in an organization is implemented and

analyzed in this work. The entire team can detect the proximity of the members through

the iBeacon services provided by the app. In addition to the proximity features, the

minimum required project management services like task management, employee

tracking, instant chat, employee log, and status report are also implemented. It is cost-

effective and efficient in the sense that the proposed app completely avoids the instal-

lation of dedicated and static hardware iBeacon. Feasibility study and analysis of the

proposed iBeacon service reveals certain constraints while using the app in an office

environment. In future work, this can be expanded to multiple team connections solving

the proximity limitations, and the whole group tasks can be separately maintained for

the ease of usage. The proposed work can be expanded to a complete suite of commu-

nication collaboration system for project management with additional features like

presentation, video chat, file sharing, etc in the future.

7 References

[1] A. J. Gilbert Silvius, Celine M. Silvius (2015), Exploring functionality of mobile applica-

tions for project management, Procedia Computer Science, 64:343 – 351. https://doi.org/

10.1016/j.procs.2015.08.498

[2] Sanchez, M. A. (2018), How Internet of Things Is Transforming Project Management, In Z.

Gontar (Ed.), Smart Grid Analytics for Sustainability and Urbanization, Hershey, PA: IGI

Global, pp. 73-102. https://doi.org/10.4018/978-1-5225-3996-4.ch003

[3] Pulse of the Profession (2018), Success in Disruptive Times- Expanding the Value Delivery

Landscape to Address the High Cost of Low Performance, PMI, [online] Available

at:https://www.pmi.org/learning/thought-leadership/pulse/pulse-of-the-profession-2018#

[4] Matthew Finnegan (2019), Task management apps: Collaborative project tracking tools for

the digital workplace, ComputerWorld, April 3, [online] Available at: https://www.comput-

erworld.com/article/3386418/task-management-apps-collaborative-project-tracking-tools-

for-the-digital-workplace.html

iJIM ‒ Vol. 14, No. 3, 2020

143

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

[5] Paul Chaney(2018), 15 Ways Small Businesses Can Use Beacons and Geofencing to Attract

and Retain Customers, December 24, Technology Trends, [online] Available at:

https://smallbiztrends.com/2017/01/location-based-marketing-beacons-geofencing.html

[6] Zhu, Lingling & Yang, Aolei & Wu, Dingbing & Liu, Li. (2014), Survey of Indoor Position-

ing Technologies and Systems, Communications in Computer and Information Science,

461:400-409. https://doi.org/10.1007/978-3-662-45283-7_41

[7] ChoonSung Nam, Dong-Ryeol Shin (2018), Vehicle location measurement method for ra-

dio-shadow area through iBeacon message, International Journal of Distributed Sensor Net-

works, 14(11). https://doi.org/10.1177/1550147718812578

[8] iBeacon and Bluetooth Beacon Market: Recent Industry Trends, Analysis and Forecast 2026,

Digital Journal. [online] Available at: http://www.digitaljournal.com/pr/3940756

[9] K. E. Jeon, J. She, P. Soonsawad, P. C. Ng (2018), BLE Beacons for Internet of Things

Applications: Survey, Challenges, and Opportunities, IEEE Internet of Things Journal,

5(2):811-828. https://doi.org/10.1109/jiot.2017.2788449

[10] Apple Developer website, Getting Started with iBeacon-Version 1.0, June 2 2014, [online]

Available at: https://developer.apple.com/ibeacon/Getting-Started-with-iBeacon.pdf.

https://doi.org/10.1017/cbo9780511583926.003

[11] Apple documentation, Turning an iOS Device into an iBeacon Device, [online] Available

at:https://developer.apple.com/documentation/corelocation/turning_an_ios_device_into_an

_ibeacon_device. https://doi.org/10.1007/978-1-4842-1527-2_6

[12] Nic Newman (2014), Apple iBeacon technology briefing, Journal of Direct, Data and Digital

Marketing Practice 15:222–225. https://doi.org/10.1057/dddmp.2014.7

[13] Claire Swedberg(2017), London Airport Enables Proximity Apps With BLE Beacons, RFID

Journal, [online] Available at:https://www.rfidjournal.com/articles/view?16214

[14] Yang J., Wang Z., ZhangX. (2015), An iBeacon-based indoor positioning systems for hos-

pitals, International Journal of Smart Home,9:161-168. https://doi.org/10.14257/ijsh.2015.

9.7.16

[15] Charles Atherton(2019), Beacons: A tool for 21st Century teaching and learning?, Research

in Learning Technology, 27. https://doi.org/10.25304/rlt.v27.2127

[16] Riya Lodha, Suruchi Gupta, Harshil Jain, Harish Narula(2015), Bluetooth Smart based At-

tendance Management System, Procedia Computer Science, 45:524 – 527. https://doi.org/

10.1016/j.procs.2015.03.094

[17] Monica Laxman Uttarwar, Arun Kumar, Peter H. J. Chong(2017), BeaLib: A Beacon Ena-

bled Smart Library System, Wireless Sensor Network, 9:302-310. https://doi.org/10.4236/

wsn.2017.98017

[18] Yang Yang, Zhouchi Li, K. Pahlavan(2016), Using iBeacon for intelligent in-room presence

detection, 2016 IEEE International Multi-Disciplinary Conference on Cognitive Methods in

Situation Awareness and Decision Support (CogSIMA), San Diego, CA, pp. 187-191.

https://doi.org/10.1109/cogsima.2016.7497808

[19] Santhosha Rao, Smitha A, Kunal Kulkarni, Smart Phone based Cost Effective Visitor Man-

agement System for Smart Offices, International Journal of Interactive Mobile Technologies

(iJIM), 12(6):112-123. https://doi.org/10.3991/ijim.v12i6.9476

[20] M. Choi, W. Park, I. Lee (2015), Smart office energy management system using Bluetooth

low energy-based beacons and a mobile app, 2015 IEEE International Conference on Con-

sumer Electronics (ICCE), Las Vegas, NV, pp. 501-502. https://doi.org/10.1109/icce.2015.

7066499

[21] Estimote use case, All Hours - an attendance tracking software with beacons, [online] Avail-

able at: https://community.estimote.com/hc/en-us/articles/203844928-All-Hours-an-attend-

ance-tracking-software-with-beacons

144

http://www.i-jim.org

Paper—Implementaion and Analysis of a Smart Team Management System using iOS.Devices as iBeacon

[22] staffNearby App website: https://www.staffnearby.com/#features

[23] Beacon Based Task Management Android App, August 2019. https://www.bea-

conzone.co.uk/blog/beacon-based-task-management-android-app/

[24] Jeongyeup Paek, JeongGil Ko, Hyungsik Shin (2016), A Measurement Study of BLE iBea-

con and Geometric Adjustment Scheme for Indoor Location-Based Mobile Applications,

Mobile Information Systems, 2016: Article ID 8367638, 13 pages. https://doi.org/10.

1155/2016/8367638

[25] F. Zafari, A. Gkelias and K. K. Leung 2017), A Survey of Indoor Localization Systems and

Technologies, IEEE Communications Surveys & Tutorials, 21(3):2568-2599. https://doi.

org/10.1109/comst.2019.2911558

[26] Pavel Kriz, FilipMaly, Tomas Kozel (2016), Improving Indoor Localization Using Bluetooth

Low Energy Beacons, Mobile Information Systems, 2016: Article ID 2083094, 11 pages.

https://doi.org/10.1155/2016/2083094

[27] Jun-Ho Huh, Kyungryong Seo(2017), An Indoor Location-Based Control System Using

Bluetooth Beacons for IoT Systems, Sensors, 17(12), 2917. https://doi.org/10.3390/s17122

917

[28] Bo Xiang (2017), Application of Ranging Difference Location Algorithm in Wireless Sensor

Network Location, International Journal of Online and Biomedical Engineering (iJOE)

13(7). https://doi.org/10.3991/ijoe.v13i07.7285

[29] Choosing the Transmitted Power, [online] Available at: https://www.beconzone.co.uk/

choosingthetransmittedpower

[30] The complete guide to website wireframe design - Chapter 8, Beginner’s guide to UI sketch-

ing, Prototyping And Wireframing, July 09, 2019, [online] Available at: https://www.jus-

tinmind.com/blog/from-a-mere-wireframe-to-a-final-website-design/

[31] Apple Developer Documentation, https://developer.apple.com/documentation/

[32] Ron Kliffer(2018), Alamofire Tutorial: Getting Started, [online] Available at:

https://www.raywenderlich.com/35-alamofire-tutorial-getting-started

[33] Estimote developer docs, Part 3: Ranging beacons, [online] Available at: https://devel-

oper.estimote.com/ibeacon/tutorial/part-3-ranging-beacons/

8 Author

Sindhumol S. Ph.D., is an Associate Professor in DDU Kaushal Kendra, Cochin

University of Science and Technology, Kochi, INDIA. Her main research interests in-

clude image/video processing, pattern recognition, iOS app development, and IoT.

Article submitted 2019-09-15. Resubmitted 2019-11-19. Final acceptance 2019-11-19. Final version pub-

lished as submitted by the authors.

iJIM ‒ Vol. 14, No. 3, 2020

145