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Survey of WSN Technology Based Reliable and
Efficient Active RFID
Raed Abdulla
School of Engineering
Asia Pacific University of Technology & Innovation (APU)
Kuala Lumpur, Malaysia
Widad Ismail
School of Electrical and Electronic Engineering
Universiti Sains Malaysia
Pulau Pinang, Malaysia
Abstract— a wireless sensor network allows low-power, low-
cost, and wireless multifunctional sensor devices that
communicate over short distances and are small in size. In the
following paper, a survey of WSN technology based reliable and
efficient active RFID is presented. First, the accessible wireless
standards are evaluated based on preferred criteria such as
reliable end-to-end communication, low power consumption,
latency, throughput and long range are crucial requirements.
Secondly, advantages and performance issues of each wireless
standard are presented and discussed.
Key words — WSN, ZigBee, active RFID, mesh topology.
I. INTRODUCTION
Sensing and communication are the two major functions of
the WSN, while energy conservation and routing mechanism
are two hot topics [1]-[2]. A WSN is composed of a significant
number of sensor nodes that can be deployed on the ground, in
the air, in vehicles, or inside buildings [3]. A sensor node
consists of a sensor to monitor and control physical parameters
at different locations, radio transceiver, a microcontroller
(MCU), and a power source. WSN is widely used for health,
home, control, communications, computing, surveillance,
intelligence, reconnaissance, and targeting systems [1].
Even though most of the related work on WSN based RFID
concerns with the improvements of energy efficient protocols,
a study tackling all the aforementioned requirements was still
lacking. In this work, power consumption, long range, reliable
end-to-end communication, latency and throughput were
considered when WSN-based low-power are analyzed for the
purpose of building an active RFID system. We will
concentrate on ZigBee and how the ZigBee-Enabled Active
RFID. We are interested in ZigBee because ZigBee is key
wireless technologies that serve a wide range of applications as
separate solutions, and can provide enhanced performance
when integrated within a common system.
To recognize the value of enabling a wireless connection
between the RFID tags and reader, and on the other hand
between the RFID reader and computer network, the next
review is on the evaluation of the existing wireless standards.
Options for making a wireless connection, but choosing a
standard-based technology over a proprietary solution is
beneficial, since the available wireless standards obtain more
flexibility and universal functionality [4].
In deciding which standard is the best choice, the accessible
wireless standards are evaluated based on preferred criteria.
For the monitoring and tracking application of an RFID
system, reliable end-to-end communication, low power
consumption, end-to-end delay of packet (Latency), delivery
ratio (Throughput) and long range are crucial requirements,
while support for a large network size and low cost are
additional advantages.
Latency is the end-to-end delay of packet, and latency
requirements depend on the type of application. For example,
in an of environment surveillance application, when an event is
detected, sensor nodes should be able to report the local
processing result in a timely manner so that appropriate action
can be promptly taken. Throughput, or delivery ratio, is the
ratio of packets received by the sink to the packets sent by the
source. Like latency, throughput requirements vary with
different applications. Some applications need to constantly
sample the environment and transfer many packets. In other
applications, such as fire detection, it might be enough for a
single report to be received by the sink [5]-[6].
II. SURVEY OF WSN TECHNOLOGY BASED RELIABLE AND
EFFICIENT ACTIVE RFID
Many different protocols have been defined under the IEEE
standards, as shown in Fig. 1 [7].
Fig. 1. The 802 wireless spaces a graphical comparison
In this work, four specific standards for WSN-based low-
power wireless communication technologies are analyzed for
2013 IEEE 11th Malaysia International Conference on Communications
26th - 28th November 2013, Kuala Lumpur, Malaysia
978-1-4799-1532-3/13/$31.00 ©2013 IEEE 116
the purpose of building an active RFID system, and one of
these is implemented further on.
1. IEEE802.11 / Wi-Fi
2. IEEE802.15.1 / Bluetooth
3. IEEE 802.15.3 / Ultra Wideband (UWB)
4. IEEE802.15.4 / ZigBee
The coverage area of wireless communication is restricted
by the ability of the wireless device used. A device that gives a
large coverage area will be very costly. Also, the more
powerful a wireless device is, the more power it will consume.
Moreover, it will produce high amounts of electromagnetic
radiation, which can be hazardous to human health [8].
A. Wi-Fi
Wi-Fi (IEEE 802.11) is a set of Wireless Local Area
Network (WLAN) standards and was developed by the IEEE
LAN/MAN Standards Committee. This protocol is usually
utilized in PC-based systems because it was developed to
extend or substitute for a wired LAN [9]. The original IEEE
802.11 defines three PHYs, one based on diffused infra-red
radiation and two based on 2.4 GHz Industrial, Scientific and
Medical (ISM) band [10]. The main advantage of this wireless
system is that its access points can provide robust security
mechanisms and are easily modified to act as RFID readers.
Furthermore, the cost of chipsets is falling since there is intense
competition among vendors due to the popularity of this
technology [11]. The IEEE 802.11 architecture consists of a
number of components that interact to support a wireless LAN,
providing station mobility transparently to upper layers. The
basic cell is called a Basic Service Set (BSS), which is a set of
fixed or mobile stations. If a station moves outside its BSS, it
can no longer directly talk with other members of the BSS.
Based on the BSS, IEEE 802.11 employs the self-determining
basic service set (IBSS) and extended network configurations.
As shown in Fig. 2 IBSS operation is possible while IEEE
802.11 stations are capable to communicate directly without
any AP [12].
Fig. 2. IBSS and ESS configurations of Wi-Fi networks
The communication range is approximately 100 m [13].
Wi-Fi was designed for high data rate applications (from
1Mbps up to 144Mbps). These features make it suitable for
new applications of RFID when higher data rate is required
[14]. However, its power consumption is rather high,
approximately 300 mW for 802.11 b, and the short autonomy
of a battery power supply still remains a significant
disadvantage, increasing the difficulty of adapting this
technology to the RFID tag system [15].
B. Bluetooth
Bluetooth (IEEE 802.15.1) is standard for Wireless
Personal Area Network (WPAN). The Bluetooth research was
begun in the mid-1990s by Ericsson and uses a master/slave-
based MAC protocol, designed to present a user-friendly
interface and provide secure and reliable communication [16].
The Bluetooth protocol allows for low-cost, low power and
short range wireless communications in WPAN at 2.4 GHz
ISM band between Bluetooth devices. Additionally, Bluetooth
enables ad-hoc wireless networking, which allows formation
of a network without base stations [17], and this technology
can replace the hardwired connections of portable and/or fixed
electronic devices over relatively short distances. It can be
used for both voice transmission and data transfers, such as
downloading or uploading programs [18]. Fig. 3 [19] shows a
diagram of the RFID-enhanced Bluetooth. Compared to Wi-
Fi, Bluetooth have the same indoor range of around 300ft,
while the battery life is much longer than for Wi-Fi devices.
However, the Bluetooth data rate is much less than that of
Wi-Fi, at 0.8Mbps throughout [20]. As a result, these features
make it suitable for new applications of RFID when low
amounts of information are to be sent. At the same time, a
preventive issue of the Bluetooth technology is its time-
consuming device discovery process, which can take tens of
seconds to find the device to be connected [21]. Furthermore,
the Bluetooth discovery process is not scalable to perform in
the presence of many devices [22], and the reliability of the
Bluetooth physical layer is lower, making the technology a
little more likely to suffer from interference [23].
Fig. 3. RFID-enhanced Bluetooth connectivity
From the above-mentioned factors, many challenges would
be created by using Bluetooth in an active RFID architecture;
for example, multiple tags communicating with a reader at one
time would result in unsupportable complexity and latency in
the system. Furthermore, the tags could produce severe
2013 IEEE 11th Malaysia International Conference on Communications
26th - 28th November 2013, Kuala Lumpur, Malaysia
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network collision rates and poor network performance. Thus,
Bluetooth is not especially suited to form large networks and
cannot deliver reliable multi-hop data transfers, but is more
suitable for to temporary peer-to-peer communications and
unprompted data transfers.
C. UWB
UWB (IEEE 802.15.3) has gathered much attention as an
indoor short-range and high-speed wireless communication
technology [15] UWB has the ability to achieve low power
consumption, low-cost implementation and high throughput
[24]. The main characteristic of UWB is that its bandwidth is
over 110 Mbps, making it suitable for many multimedia
applications such as audio and video delivery in home
networking; it can also act as a cable replacement for a high
speed serial bus such as USB 2.0. Fig. 4 shows an example of a
WSN using UWB link to pass data from the tags to the
corresponding reader, and the reader then forwarding data to
the WLAN through ad-hoc functionality, with a reading field
of around 10 meters. Unfortunately, UWB downlink reception
from the base station to the tag is typically very composite and
consumes high power [25].
Fig. 4. Generic sensor networks architecture for UWB
Furthermore, the essential data rate from the work station to
the tag is very low. One advantage of using UWB in a RFID
system is that only a low transmission time is required,
compared to Wi-Fi and Bluetooth, because UWB was designed
for short range and high data rate applications [12].
However, the power consumption is still higher than Wi-Fi
and Bluetooth. A UWB network has limited memory and
computational capacity, which reduces its suitability for sensor
networking applications; also, like Bluetooth, the maximum
number of devices that can be affiliated in a UWB network is
limited to only 8 (7 slaves plus one master).
D. ZigBee
ZigBee (IEEE 802.15.4) is a wireless technology that
builds upon the Institute of Electrical and Electronics
Engineers (IEEE) standard 802.15.4, which defines the
physical (PHY) and Medium Access Control (MAC) layers,
and works on a low data rate standard [26]-[27]. The ZigBee
Alliance is an industry association that supports the use of the
technology, enabling it for WSNs [28]. Then, the ZigBee
Alliance and the IEEE decided to join forces and ZigBee is the
commercial name for this technology [29]. IEEE and ZigBee
Alliance have been working continually to specify the entire
protocol stack and establish layers for security, wireless
networks, and application framework [30]. Fig. 5 shows
ZigBee using the IEEE 802.15.4 physical and MAC layers.
IEEE 802.15.4 defines specifications for the lower two layers
of the protocol, PHY and MAC; meanwhile ZigBee Alliance
intends to provide the upper layers of the protocol stack, from
the network layer to the application layer [29]. ZigBee
standard supports low-speed, low-cost wireless networking
with long device battery lifetimes and devices as well as low
latency [31].
ZigBee technology is suitable for a wide range of
monitoring activities, including building automation, health
monitoring, automated meter reading equipment, grain storage,
remote controls, heating and cooling control devices, fans, and
structural integrity [32]-[33]-[34]. Furthermore, ZigBee is the
suitable wireless technology to be employed in in the fields like
Industrial Automation, Home Area Network, Patient
monitoring and monitoring systems [35].
Fig. 5. The ZigBee Standard and IEEE 802.15.4
Because the ZigBee standard is based on IEEE 802.15.4,
implementing a ZigBee network has similar requirements to an
802.15.4 network. Fig. 6 shows how ZigBee can be
implemented in active RFID devices. The technology consists
of three different physical device types that operate in a self-
organizing network application: ZigBee Coordinators (ZC),
ZigBee Routers (ZR), which are Full-Function Devices
(FFDs), and ZigBee End Devices (ZED), which are Reduced-
Function Devices (RFDs). These physical devices are used to
create a ZigBee network [36]. The ZC acts as the network head
ZigBee
or User Application / Profiles
Application framework
Network and Security
Layers
PHY Layer
2.4
GHz
868/915
MHz Layer
Applications
MAC Layer
MAC Layer
ApplicationZigBee Stack Silicon Profiles
User
ZigBee
Alliance
Platform
IEEE
802.15.4
2013 IEEE 11th Malaysia International Conference on Communications
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and is typically mains powered, and there can only be one PAN
(Personal Area Network) coordinator in a network. The ZR,
which is an FFD, can perform the function of routing the data
between the nodes. ZEDs are the leaf nodes, and can check the
availability of the nodes to send data, have minimum
functionality, and as reduced-function devices are always
battery-powered [37]. The ZC starts by sending a beacon frame
to all its neighbors, and when a node accepts the framework of
the beacon, it can be sent with a request to join the network
[38].
Fig. 6. Implementing ZigBee in active RFID devices
III. BLUETOOTH VS. ZIGBEE FOR RFID
Power consumption in a sensor network is of primary
significance and should be minimized [39]. On the other hand,
efficient processing and protocol management overhead is
required for ad-hoc networking [40]. Table I provides a
comparison between Bluetooth and ZigBee.
For applications where higher data rates are significant,
Bluetooth clearly has the advantage since it can support a wider
range of traffic types than ZigBee. Bluetooth is almost
certainly the closest peer to WSNs, but power consumption
was not given importance in its design and turning on and off
consumes a great deal of energy; therefore, Bluetooth is not
appropriate for applications that need ultra-low power
consumption.
TABLE I. COMPARISON BETWEEN BLUETOOTH AND ZIGBEE
In contrast, the ZigBee protocol places major importance
on power management; it was developed for low power
consumption and prolonged battery life. Bluetooth nodes have
lower battery life compared to ZigBee, and the network
flexibility of ZigBee is much higher than Bluetooth, as it
allows different topologies. Finally, ZigBee facilitates a larger
number of nodes (more than 65,000), while the maximum
number of Bluetooth devices in one network building cell is 8
(7 slaves plus one master) [12].
IV. ZIGBEE NETWORK TOPOLOGIES
The ZigBee standard supports four multiple topology
network configurations, namely, star, peer-to-peer, mesh and
cluster tree topology. All topologies are established by only
one coordinator [41]-[42]. Fig. 7 illustrates all the ZigBee
topologies. Advantages and disadvantages of each kind of
topology depend on the individual application or situation.
A. Star Topology
Star topology is a basic topology, consisting of one
coordinator device and a number of ZigBee endpoints devices
that are all connected directly to the coordinator. Low latency
in the star topology network is the main advantage. On the
other hand, all devices have to be in range of the coordinator,
and this restriction makes it suitable only for small networks
such as one composed of a single data collector and a number
of sensor endpoints within close range.
Fig. 7. ZigBee Topologies
B. Peer to Peer Topology
In this topology, each device has the capacity to
communicate directly to any other device within its range.
Therefore, in peer-to-peer topology, non-beacon mode is more
efficient than beacon mode. Even though it has lower latency
than star topology, it necessitates most of the devices to be
routers, which will lead to a small size network.
Specifications Bluetooth ZigBee
Standards IEEE 802.15.1 IEEE 802.15.4
Data rate 1 Mb 20-250 kb
Latency (time to establish a new link)
< 10 s 30 ms
Frequencies 2.4 GHz 2.4 GHz
No. of nodes 8 65,000
Modulation FHSS DSSS
Network topology Ad hoc Pico nets Ad hoc, star, mesh
Data type Audio, graphics, pictures
Small data packet
Battery life 1 week > 1 year
Extendibility No Yes
2013 IEEE 11th Malaysia International Conference on Communications
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C. Cluster Tree Topology
The cluster tree topology is essentially a combination of
star and mesh. In this topology, unlike mesh topology, no
router can have multiple parents, and as a result the system has
only limited self-healing capabilities. Bottlenecks might also
occur in the backbone links of the network. The routers in
cluster-tree networks utilize beacon-oriented communication,
while mesh networks allow peer-to-peer communication and
do not emit beacons.
D. Mesh Topology
Using mesh topology, each node may communicate directly
with any other node within range by giving many possible
routes during the network. Further, any end device in the
network is able to choose any of its nearby routers as its parent,
and such a feature makes the mesh topology a more
complicated, very robust topology. It also has the ability to
incorporate a large number of devices into a self-healing
network, where badly performing routes can be ignored.
Furthermore, mesh networks are easily deployed, maintained,
and scaled up or down according to the application. Therefore,
the ZigBee mesh networking protocol is selected as the
communications standard for this work.
ZEDs cannot route and always give their data to the parent
node (ZC or ZR). When joining a network, the ZED selects a
parent and receives an announcement with a short 16 bit
address. If the ZED is restarted, it is confirmed as an orphan
and instantaneously its router retransmits the 16 bit address to
the network again. Repeated failure of this process starts the
association process again, so that it can be engaged to another
parent and as a result, the throughputs will increase [43]. The
main tasks of a router consist of redirecting information within
the network and storing ZED information in a buffer until the
ZED wakes up, as the ZED periodically sleeps and broadcasts
a data request frame upon waking up. However, with this
frame, the parent can send the data stored in its buffer to the
ZED. In ZigBee mesh networks, the ZR and the ZC find out
the route to the destination point by using messages at network
level as (Route Request) and (Route Reply).
The messages will pass through the ZRs until they arrive at
their destination, even if there is no direct communication.
However, the ZR will look for a new route for the sake of
sending the information to the destination. These topologies
(partial-mesh and full-mesh) can be built with increasing
numbers of ZRs, with a corresponding increase in energy
consumption [44].
V. CONCLUSION
Based on a comparison between the available wireless
protocols, ZigBee offers trustworthy mesh networking, very
long battery life and low overall cost. Furthermore, the benefits
of integrating ZigBee technology into an RFID system have
been discussed. Such an integration scenario will assist the
communication link techniques in the RFID system to achieve
reliable communication by controlling packet transmission
overhead, saving power consumption and extending the
reading range. In short, RFID and ZigBee are key wireless
technologies that serve a wide range of applications as separate
solutions, and can provide enhanced performance when
integrated within a common system. Finally, ZigBee is
preferred for this research due to its mesh network capabilities
and its flexibility for accessing more communication paths than
Wi-Fi, Bluetooth or UWB.
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