Autonomic computer

Autonomic Computing in Wireless Sensor Networks
1
Jaffer Basha J#, 2Elanthendral.M #
1
Jafferbasha2001@gmail.com, 2thendral5320@gmail.com
UG STUDENTS
#
Department of Computer Science and Engineering
SREE Sowdambika College of engineering, Arruppukottai

Abstract— Wireless ad hoc networks of sensor nodes are The paper introduces Autonomic computing and wireless
envisioned to be deployed in the physical environment to sensor network concepts. Discusses how the fundamental
monitor a wide variety of real-world phenomena. Wireless properties of Autonomic computing comply with the basic
sensor networks (WSN’s) are becoming popular in military design requirements for wireless sensor networks. Proposed
and civilian applications such as surveillance, monitoring, protocols for Wireless Sensor Network and their applicability
disaster recovery, home automation and many others. Almost and suitability to Autonomic Wireless Sensor Networks and
any sensor network application requires some form of self- required improvements. The paper gives brief overview of
configuration and autonomic functionality. Following IBM’s research projects and architectures for autonomic
initiatives towards Autonomic computing many architectures communication and networking which can be applied to
and protocols for network self-organization and management WSNs. The last section focuses on the current and possible
have been proposed and being implemented. future applications of Autonomic Wireless Sensor Networks.
The paper presents concept of Autonomic Computing with
respect to Wireless Sensor Network. The paper introduces
Wireless sensor network basics, design goals and challenges II. AUTONOMIC COMPUTING
along with current and future applications. It articulates A. Background
basic needs of incorporating autonomic computing principles
into the design of Wireless Sensor Networks. The paper also The dramatic increase in computing devices increased
outlines recent contributions to Autonomic network computing capacity and complexity combined with popularity
architectures, research projects, proposed architectures and of internet resulted in phenomenal growth in heterogeneous
routing protocols for Autonomic Wireless Sensor Networks. networks and network applications. With this increasing
system complexity, network management issues and
communication protocols are reaching a level beyond human
ability to manage and secure so the stability of current
Keywords— Wireless sensor networks, Autonomic Computing,
infrastructure, systems, and data is at an increasingly greater
Autonomic Wireless sensor networks, Service oriented architecture
risk to suffer outages and general disrepair. Future network
algorithms need to be adaptive, robust, and scalable with fully
distributed and self-organizing architectures. Automation,
I. INTRODUCTION self-protection and self management of wide spread networks
Wireless sensor networks have critical applications in the may solve the problem till some extent.
scientific, medical, commercial, and military domains. As the concept of self management rooted up, the most
Examples of these applications include environmental direct inspiration one can think of was the autonomic function
monitoring, smart homes and offices, surveillance, and of the human central nervous system, where autonomic
intelligent transportation systems. It also has significant controls use motor neurons to send indirect messages to
usages in biomedical field. As social reliance on wireless organs at a sub-conscious level. These messages regulate
sensor network technology increases, we can expect the size temperature, breathing, and heart rate without conscious
and complexity of individual networks as well as the number thought. Observation and analysis of these complex adaptive
of networks to increase dramatically. systems found in nature became a major source of inspiration
Wireless sensor networks are typically used in highly to design algorithms for self-managed, self-organized, self-
dynamic, and hostile environments with no human existence configuring and self-protecting systems.
(unlike conventional data networks), and therefore, they must Taking inspiration from autonomic nervous system of the
be tolerant to the failure and loss of connectivity of individual human body IBM created a foundation for autonomic systems
nodes. The sensor nodes should be intelligent to recover from by taking initiatives towards Autonomic Computing for
failures with minimum human involvement. Networks should relieving humans from the burden of managing computer
support process of autonomous formation of connectivity, systems which is growing enormously till the extent of
addressing, and routing structures. Recent researches on unmanageability [1].
Autonomic Networking can serve as basis for design of
Autonomic Wireless Sensor Networks. B. Autonomic System

Autonomic System is a system which works independently allocation techniques, security and management schemes need
on predefined policies and rules without any human to be developed for autonomic elements, and a scalable
interaction and manage and configure itself on its own based management platform is required to coordinate the autonomic
on predefined rules and gained knowledge over the time. IBM elements into a self-managing system.
has defined the following four functional areas for self
management of Autonomic System: [3]
• Self-Configuration: Automatic configuration of
components.
• Self-Healing: Automatic discovery, and correction of
faults.
• Self-Optimization: Automatic monitoring and control of
resources to ensure the optimal functioning with respect
to the defined requirements.
• Self-Protection: Proactive identification and protection
from arbitrary attacks

C. IBM Autonomic Computing Architecture Figure 2. Basic Architecture of Wireless Sensor Network
IBM Autonomic Computing Architecture [2] defines an
abstract information framework for self-managing IT systems.
In the information framework, an autonomic system is a
III. WIRELESS SENSOR NETWORK
collection of autonomic elements. Each autonomic element
consists of an autonomic manager (AM) and the managed A wireless sensor network (WSN) is a network that is made
resource (MR). The communication between the AM and the of hundreds or thousands of sensor nodes which are densely
MR is done through the MR’s management interfaces, which deployed in an unattended environment with the capabilities
exposes two types of hooks, sensors and effectors. The of sensing, wireless communications and computations (i.e.
sensors are used by the AM to obtain the internal state of the collecting and disseminating environmental data). These
MR, and the effectors are used by the AM to change the spatially distributed autonomous devices cooperatively
behaviour of the MR. The AM enables self-management of monitor physical and environmental conditions, such as
the resource using a ‘‘monitoring, analysis, planning, and temperature, sound, vibration, pressure, motion or pollutants,
execution’’ control loop, with supporting knowledge of the at different locations. The basic architecture of Wireless
computing environment, management policies, and some sensor Network is shown in Figure2.
other related considerations.

Figure 3. Components of a Sensor Node (Ref [04])

Each autonomic node in a sensor network is typically
Figure 1. Basic Autonomic Computing Reference Architecture
equipped with a radio transceiver or other wireless
communications device, a processing unit which can be a
The autonomic computing information model only provides
small micro-controller, sensing unit, and an energy source,
the conceptual guidance on designing self-managed systems;
usually an alkaline battery. Sometimes, a mobilizer is needed
in practice, the information model needs to be mapped to an
to move sensor node from current position and carry out the
implementable management and control architecture for
assigned tasks. Since the sensor may be mobile, the base
Autonomic Networks. Specifically, measurement techniques,
station may require accurate location of the node which is
rule engines, planning methodologies, dynamic resource

done by location finding system. The size of a single sensor some applications may require a faster communication
node can vary from shoebox-sized nodes down to devices the and instant response. Routing algorithms should be
size of grain of dust. [4] intelligent to choose minimum hop and minimum
distance paths for data transfer. [7]
• Management challenge – Managing the communication
A. Requirements and Design factors in WSN over heterogeneous networks is basic challenge in self-
Following are some of the basic requirements and design managed system because policies and communication
factors of wireless sensor network which serve as guidelines protocols plan an important role in network
for development of protocols and algorithms for WSN communication. Also, it is necessary to balance the level
communication architecture. of detail the network is providing to the client against the
• Fault Tolerance, Adaptability and Reliability: Sensor rate at which energy is being consumed while gathering
networks are required to operate through adapting to the the data. Clearly, it is preferable to have the network
environmental changes that sensors monitor. The automatically do this tuning, rather than requiring manual
networks should be self-learning. Reliability is the ability intervention.
to maintain the sensor network functionalities without any
interruption due to sensor node failure. Sensor node may These basic requirements and design goals serve as
fail due to lack of energy, physical damage, challenge for current technology. Though current IP routing
communications problem, inactivity, or environmental protocol exist and have significant applications in current
interference. The network should be able to detect failure networks and Internet, they do not satisfy complete design
of a node and organize itself, reconfigure and recover requirements in Wireless sensor networks because WSN
from node failures without loosing any information. [5] nodes typically has limited computing capacities and less
• Power Consumption and Power management: One of the power. So WSN’s require a different infrastructure and
components of sensor nodes is the power source which protocol stack which can be implemented using autonomic
can be a battery. The wireless sensor node being a computing concept as we will discuss in next section.
microelectronic device, can only be equipped with a
limited power source [4]. Over the remote inaccessible
place with less human control and existence, power IV. WSN AND AUTONOMIC COMPUTING
sources play critical role in survival of sensor nodes. To clarify the contribution that autonomic computing can
Power source should be intelligently divided over bring to Wireless Sensor Networks (WSN), let’s examine how
sensing, computation, and communications phases as per WSN design requirements and operations can be tackled using
requirement. Sensors can be hibernated when inactive. autonomic principles.
Lots of current researches are focusing on designing As discussed above, there can be sensor nodes which are
power-aware protocols and algorithms for wireless sensor moving and can change their position dynamically or even
networks. Recently, solar energy is also considered as an leave the network coverage area. Therefore, a pre-
option for empowering remote sensor nodes which are programmed configuration for the network will not work.
exposed environment. Self-configuring nodes can set up network connections,
• Network Efficiency and Data Aggregation: Flooding raw evaluate if there are any gaps in the WSN and replace a
sensed data over the network can easily congest the moved or dead node in the network. Since sensors can be
network. Some critical applications like intruder deployed in an unattended area (e.g., forest and ocean) or
detectors require urgent transmission and faster physically unreachable area (e.g., inside a building wall), they
processing of data which may degrade performance and are required to operate with the minimum aid from base
loose reliability due to congestion or latency in the stations or human administrators. Although majority of
network. Intelligent aggregation of sensed data and current sensor application have already considered this in their
elimination of unwanted and redundant information and network design, there is still a need for WSN to have the
data compression can be a solution for efficient resource ability to reconfigure and recover itself without too much
and energy utilization and congestion avoidance. Many human intervene, especially in inaccessible environment. [4,5]
algorithms like directed diffusion [6] are proposed to Sensor reading usually contains some noises; it may be a
facilitate data aggregation and dissemination within the false positive due to malfunction of sensors. Sensors are
context of WSNs. required to collectively self-heal (i.e., detect and eliminate)
• Intelligent Routing: In many applications, sensor nodes false positives in their sensor readings instead of transmitting
are moving nodes and can change place dynamically. them to base stations. This can also reduce power
Routing protocols must be adaptive to these changes and consumption of sensors because data processing within the
should be self-healing and self-configuring. The sensor incurs much less power consumption than data
information should be persistent in spite of changes in transmission does [7].
network nodes. Low processing capacity of a node creates Sensor nodes are generally exposed to much harsher
many challenges for routing packets throughout the conditions than standard computing equipment, and are thus
neighbouring nodes intelligently. As discussed above, subject to energy depletion and incidental damage. Battery

failure can result in lost sensor node. This leads to a gradual Service-oriented architecture [14] is an approach to build
degradation of the network as individual nodes are lost. distributed systems that deliver application functionality as
Network paths break and gaps appear in the coverage area. A services to end-user applications or to build other services. It
WSN needs to adapt to the changes, recover from losses and decomposes the design of large complex application, and
be self-protected. This can be achieved by renegotiating middleware architecture into various reusable services or
network routes, monitoring voltage levels within sensor node, function units. In SOA the service requester has no knowledge
controlling each node by an agent or base station and upon of the technical details of the provider’s implementation, such
failure activating redundant nodes to replace damaged ones, or as the programming language, deployment platform, and so
by informing some higher-level entity which can provide forth. The service requester typically invokes operations by
assistance. way of messages -- a request message and the response --
As discussed in requirements, maximum efficiency needs rather than through the use of APIs or file formats. Thus, the
to be gained from the available energy as the available energy application developers only need to concern the operational
at each sensor node is limited. Sensing, Processing and data description of the service which allows software on each side
transfer phases require lot of energy so each node should be of the conversation to change without impacting the other.
able to sense process and transfer data intelligently hence self-
optimization is an important trait for WSN protocols. Energy
savings can be achieved by putting the nodes into a low power
sleep mode, ready to be reactivated when the need arises. For
example, sensors may decrease their duty cycles when there is
no significant change in their sensor readings. This results in
less power consumption in the sensors. Also, when
neighboring sensors report environmental changes, a sensor
may draw inference from the reports and increase its duty
cycle to be more watchful for a potential local environmental
change in the future. However, there exists a trade-off in that
the computational cost of a globally-optimal solution such as
this is often computationally intractable, whether by 8-bit
nodes or 64-bit base-stations.
All basic WSN self-management principles comply with
the concept of autonomic computing. So IBM autonomic
computing principles can be applied to wireless sensor
networks to get the desired functionality in vastly growing Figure 4. Basic Model of MANNA Architecture (Ref [19])
sensor network applications.
So far, the implementation and design of SOA is mostly
dependent on Web Services with standardized web
V. AUTONOMIC WSN MANAGEMENT ARCHITECTURE technologies such as WSDL, OGSA. As a result, it is not
As discussed in section 2.3, the basic Autonomic directly applicable to all of those complex technologies on
Computing model only provides the conceptual guidance on those resource-constrained sensor nodes. MANNA [12] has
designing self-managed systems and needs to be mapped to an presented some initial ideas of using the concept of service
implementable management and control architecture for semantics from SOA.
Autonomic Networks. An architecture for Autonomic In MANNA, all the management function units sit at the
communication and networking is an area of research lately lowest level of management architecture. They are designed
and many architectures are proposed and being developed. All with specific implementation for individual objectives in
these architectures aim to produce an architectural design that consideration of unique features of WSN. A service, at the top
enables flexible, dynamic and fully autonomic formation of layer, can use one or more of those management functions.
large-scale networks in which the functionalities of each Different services can share the same functions, but still
constituent network node are also composed in an autonomic concern each individual given aspect based on the polices and
fashion. Moreover, these architectures also support mobile network state obtained from WSN models. The basic model of
nodes and multiple administrative domains so these can be MANNA architecture is as shown in figure 4 [12].
applied to wireless sensor networks for achieving desired Furthermore, SOA can specially deal with WSN unique
goals and meet above mention challenges.Following is the aspects such heterogeneity, mobility and adaptation, and
brief discussion of some visions for the design of an efficient offers seamless management integration in the wireless
management architecture for WSNs based on top of the basic environments. Although the special features of SOA are
autonomic computing architecture. marvellous, there is still a large amount of research challenge
needed to address before the concepts of SOA can be
A. Service-Oriented Architecture appropriately applied into WSNs.

B. Policy Based Architecture Here is a brief overview of the current research projects
Policy-based management has presented its robust ability to based on Architecture for Autonomic Network
support designing of self-adaptive decentralized management communication and Self-Management which will serve as
service in WSNs. Davy S. et al. [13] proposed an autonomic guidelines for Autonomic WSN’s and will bring revolution to
communications architecture that manages complexity WSN’s and its applications.
through policy-based management by incorporating a shared A. Bison
information model integrated with knowledge-based
reasoning mechanisms to provide self-governing behaviour. BISON was a three-year project funded by the European
The architecture is organized using four distinct Commission. BISON aimed confronting the complexity
architectural constructs i.e. Shared Information, Virtual explosion problem by building robust Network Information
Software, Infrastructure and Policy as shown in figure 5.The Systems that are self-organizing and self-repairing.
shared information over the network is managed through a
virtual software which support autonomic functionality for BISON developed techniques and tools for building robust,
different heterogeneous networks and components combined self-organizing and adaptive Network Information System as
with network infrastructure which include network elements ensembles of autonomous agents by drawing inspiration from
and other computing devices. All these three modules are biological processes and mechanisms like ant colonies for
governed by policy module. [13] routing in overlay networks using swarm intelligence,
lifecycle of Dictyostelium for load balancing, epidemics for
aggregation and immune system for search.

BISON explored the use of ideas derived from complex
adaptive systems (CAS) to enable the construction of robust
and self-organizing information systems for deployment in
highly dynamic network environments. The project proposed
solutions to important problems arising in overlay networks
and mobile ad-hoc networks by developing algorithms for
routing in mobile ad-hoc networks, topology control in sensor
networks along with data aggregation and content search
algorithms for peer to peer networks. [15]
B. ANA (Autonomic Network Architecture)
ANA framework is built on the objective to provide an
architectural framework that allows the accommodation of
and communication between various networks, ranging from
small scale Personal Area Networks, through (Mobile) Ad hoc
Networks and special purpose networks such as Sensor
Networks, to global scale networks, in particular the Internet.
Figure 5. Proposed Policy Based Autonomic Architecture
ANA framework specifies how networks interact.
This model is based on three important concepts of
autonomic computing: (1) the sharing and reusing of common
information and knowledge, (2) the application of machine
learning and knowledge-based reasoning to guide the changes
in behaviour of the system, and (3) an extensible and flexible
governance model that forms a closed control loop that learns
from its decisions.
Similarly, in MANNA [12], policies describe a set of
desired behaviours of management components (e.g. manager
and agent) for indicating the real-time operations. Based on
polices, managers and agents can interact with each other in a
cooperative fashion to achieve a desired overall management
goal such as form groups of nodes, control network density,
and keep the coverage of the WSN area.

Figure 6. ANA Framework and Network compartments
VI. BRIEF OVERVIEW OF RESEARCH PROJECTS ON AUTONOMIC
NETWORKS ANA introduces the core concept of "network
compartments." The compartment abstraction allows

atomization or decomposition of communication systems and VII.APPLICATIONS AND FUTURE WORK
networks into smaller and more easily manageable units. For The applications for WSNs are many and varied. They are
example, compartments will allow decomposition of today’s used in commercial and industrial applications to monitor data
global IP network into appropriate sub-networks, which can that would be difficult or expensive to monitor using wired
be managed more autonomously from the overall network sensors. Typical applications of WSNs include monitoring,
(e.g., a different addressing or routing scheme can be applied tracking, and controlling. Some of the specific applications are
inside each compartment). [8] habitat monitoring, object tracking, nuclear reactor
A (network) compartment implements the operational controlling, fire detection, traffic monitoring and so on.
rules and administrative policies for a given communication
context. Compartments typically perform functions like 1) Wireless sensor networks are currently being used for
registration and degradation, policy enforcement, identifier intrusion detection by forming a perimeter around a secure
management and resolution and Routing. area and monitoring the progression of intruders (passing
Addressing and naming are left to compartments. The information from one node to the next). WSN’s could be
main advantages of this approach are:No need to impose a further deployed in Military applications such as hostile
unique way to resolve names and manage a unique global tracking and surveillance, spy monitoring.
addressing scheme. It is open to future addressing and naming
2) Other major current application of WSN include
schemes.
environment monitoring and applications such as animal
tracking, flood detection and weather prediction and
C. Haggle forecasting and commercial applications like seismic
activities monitoring and prediction. Many weather
Haggle is a new autonomic networking architecture
forecasting websites use WSN technology for retrieving
designed to enable communication in the presence of
weather details in remote inhibited areas. [16]
intermittent network connectivity, which exploits autonomic
opportunistic communications (i.e., in the absence of end-to- 3) WSN’s are used widely in automation and control and
end communication infrastructures). Haggle node architecture Artificial intelligence applications like Robotics.
takes inspiration from human communication model. [9]
4) Sensor networks are increasingly being used in Health
The main components of Haggle are: applications for monitoring changes in patient’s health,
• A revolutionary paradigm for autonomic behaviour and heart rate.
communication, based on advanced local forwarding and 5) Resent research project at Wayne State University and the
sensitive to realistic human mobility Kresge Eye Institute developed artificial retina using
• A simple and powerful architecture oriented to Wireless Biomedical sensors. The project aimed to build a
opportunistic message relaying, and based on privacy, chronically implanted artificial retina with sufficient visual
authentication, trust and advanced data handling functionality to allow persons without vision or with
• An open environment for the easy proliferation of limited vision to “see” at an acceptable level. [11]
applications and services.
6) Moreover, this Wireless biomedical sensor technology can
be effectively used to treat diabetes, by providing a more
D. CASCADAS consistent, accurate, and less invasive method for
CASCADAS (Component-ware for Autonomic Situation- monitoring glucose levels. Currently, to monitor blood
aware Communications, and Dynamically Adaptable glucose levels, a lancet is used to prick a finger; a drop of
Services) is an ongoing project like ANA and Haggle. blood is placed on a test strip, which is analyzed either
The overall goal of CASCADAS is identifying, manually or electronically. This constant pricking several
developing, and evaluating architectures and solutions based times a day over a period of years can damage the tissue
on a general-purpose component model for autonomic and blood vessels in that area. As proposed by Schwiebert
communication services; specifically in such context et al. [11], Wireless biomedical sensors could be implanted
autonomic service components autonomously achieve self- in the patient once. The sensor would monitor the glucose
organization and self-adaptation towards the provision of levels and transmit the results to a wristwatch display.
adaptive and situated communication-intensive services. 7) Wireless biomedical sensors may play a key role in early
detection of Cancer. As discussed in [11], cancer cells
CASACDAS approach is based on four key scientific exude nitric oxide, which affects the blood flow in the area
principles i.e. situation awareness, semantic self organization, surrounding a tumor. A sensor with the ability to detect
self similarity and Autonomic component awareness around these changes in the blood flow can be placed in suspect
which the future communication services infrastructures locations. It is likely that any abnormalities could be
should be designed and built. [10] detected much sooner with the sensors than without.

8) RFID, video and various kinds of embedded sensors can Available from WWW:
http://citeseer.ist.psu.edu/intanagonwiwat00directed.html
be used to track and monitor the patient in their everyday [7] O'Hare G.M.P., O'Grady M.J., D. Marsh, Ruzzelli A. G. and Tynan R.
activities. This information can be processed and relayed “Autonomic Wireless Sensor Networks: Intelligent. Ubiquitous
to medical personnel. Patient's routine can be assembled Sensing” Available from WWW: www.cs.ucd.ie/csprism/publications/
over the period of time and deviations from this may be pub2006/ANIPLA06.pdf
[8] ANA: Autonomic Network Architecture Project. http://www.ana-
recognized and analyzed. project.org/
[9] Haggle Project. http://www.haggleproject.org
[10] CASCADAS project. http://www.cascadas-project.org
VIII.CONCLUSIONS [11] Schwiebert L., Gupta S., Weinmann J., “Research Challenges in
Wireless Networks of Biomedical Sensors” in proceedings of the 7th
annual international conference on Mobile computing and networking.
Wireless Sensor Network technology offers significant Available from WWW: http://portal.acm.org/citation.cfm?id=381692
potential in numerous application domains. Given the diverse [12] Linnyer Beatrys Ruiz, J.M.S.N., Antonio A.F. Loureiro, “MANNA: A
Management Architecture for Wireless Sensor Networks.” IEEE
nature of these domains, it is essential that WSNs perform in a Communications Magazine, 2003. 41(2): p. 116-125. Available from
reliable and robust fashion. I believe, wireless sensor network WWW: http://www.lisha.ufsc.br/~lucas/docs/Ruiz-2003.pdf
has proved its usage in the future distributed computing [13] Davy S. et al. “Policy-Based Architecture to Enable Autonomic
environment. However, there are significant amount of Communications”. Available from WWW:
http://techpubs.motorola.com/download/IPCOM000141400D/IPCOM0
technical challenges and design issues those needs to be 00141400D.pdf
addressed. One of the biggest challenges is the designing of [14] Colan, M. Service-Oriented Architecture expands the vision of Web
efficient network management architecture to continuously services, Part 1. June, 2004 Available from WWW:
support WSNs for providing services for various sensor http://www-128.ibm.com/developerworks/library/ws-soaintro.html
[15] Gianni A., Di Caro, Frederick Ducatelle, Luca M. Gambardella,
applications. The unique features of WSNs make the design “BISON: Biology-Inspired techniques for Self-Organization in
and implementation of such management architecture dynamic Networks” Available from WWW:
different enough from the traditional networks which can be http://www.idsia.ch/~frederick/bison.pdf
[16] Wireless Sensor Networks Wiki.
satisfied by concept of Autonomic Computing. There is still
http://en.wikipedia.org/wiki/Wireless_sensor_network
no particular generic network management architecture so
taking inspiration from IBMs Autonomic Computing concept
and Biological neural network system many different research
projects are currently being executed.
In this paper, we discussed concepts of Autonomic
computing, Wireless Sensor Networks (WSN’s). Design
criteria for WSN and how it matches basic Autonomic
principles. Then we overviewed few architectures and routing
protocols suitable for WSN and ongoing research work of
Autonomic communication and network management
architectures which can be applied to WSNs. Finally, we
summarized some of the WSN applications along with future
usages.

REFERENCES
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