In the current world of technology, various physical things can be used for facilitation of a human work. That is why the Internet of Things,an innovative technology and a good solution which allows the connection of the physical things with the digital world through the use of heterogeneous networks and communication technologies, is used. The Internet of Things in smart environments interacts with wireless sensor network (WSN) and mobile ad‐hoc network (MANET), making it even more attractive to the users and economically successful. Interaction between wireless sensor and mobile ad‐hoc networks with the Internet of Things allows the creation of a new MANET‐IoT systems and IT‐based networks. Such the system gives the greater mobility for a user and reduces deployment costs of the network. However, at the same time it opens new challenging issues in its networking aspects as well. In this work, the authors propose a routing solution for the Internet of Things system using a combination of MANET protocols and WSN routing principles. The presented results of solution's investigation provide an effective approach to efficient energy consumption in the global MANET‐IoT system. And that is a step forward to a reliable provision of services over global Future Internet infrastructure.
- energy efficiency
- dynamic routing
The Internet of Things (IoT) is a part of the Future Internet paradigm, which rapidly changes the development of technologies as well as provision of services over different communication networks. The capability of objects (like physical or virtual things) to identify and communicate with each other at any time‐evolving communication technologies gives the possibility to provide advanced services over global infrastructure (as Internet) in different areas of everyday life . The interconnection of smart objects and its interoperability with global communications serve as a main idea incorporated in Internet of Things systems. Wireless sensor network (WSN) plays a main role in the IoT system as its components include sensing, acquiring of data, heterogeneous connectivity, data processing, etc. Mobile ad‐hoc network (MANET) is a wireless, multi‐hop, self‐configuring network. Its each node operates as an end system and/or a router for other nodes in the network and is closely related to WSNs. The interaction between MANET and Internet of Things opens new ways for provision of services in smart environments and challenging issues in its networking aspects as well.
One of the important factors in such MANET‐IoT systems is the energy balancing over nodes, since the IoT system is based mostly on many different wireless sensors and MANET protocols focus on selecting the shortest and efficient paths for transactions. A proper utilization of sensor's battery power is a significant key in maintaining network connectivity of a multi‐hop wireless network. Due to this, many researchers are focusing on designing energy efficient routing protocols that prolong such network lifetime. Wireless network protocols like MANET cannot be used directly due to resource constraints of sensors’ nodes, computational speed, human interface with node's devices and density of nodes in network. Therefore, it is a need of composite solution for routing over MANET‐IoT networks, which can use efficiently residual energy of nodes and extend the network's lifetime.
In this chapter, the authors propose an algorithm of energy efficient and safe‐weighted clustering routing for the mobile IoT system using a combination of MANET and WSN routing principles. Clustering is one method of making routing less complex, and for some sensor networks, more energy efficient. Such combination of MANET and WSN routing principles is able to increase the lifetime of sensors in the overall mobile Internet of Things system. It is important to decide how many cluster heads (CHs) are needed and which of the sensor nodes are going to act as cluster heads. MANET network nodes were chosen as a cluster head and a proactive routing protocol was used in such a way that it is possible to control and update a table of information about the state of the network. Nodes that rapidly lose its energy or that are left with low energy were identified and their workloads were limited for transactions. All investigations for the selection of a routing path over the MANET‐IoT system were performed by using the MATLAB simulation platform.
This research work provides important key insights into the combination of MANET and WSN routing principles by increasing the lifetime of sensors in the overall Internet of Things system. The solution of routing optimization with an effective and efficient approach to energy consumption in the global MANET‐IoT system is presented as main result of this work, which can help in accessibility and provision of services for a longer period of time over global Future Internet infrastructure.
2.1. Mobile ad‐hoc network (MANET)
The mobile ad‐hoc networks (MANETS) are autonomously self‐organized networks without fixed topology. In such a network, each node acts as both router and hosts at the same time. All network nodes are equivalent to each other and can move out or join in the network freely. The mobile nodes that are in the radio range of each other can directly communicate and transfer the necessary information. All network nodes have a wireless interface to communicate with another node in the range. This kind of network is fully distributed and can work at any place without the help of any fixed infrastructure as access points or base stations. Figure 1 shows the example of mobile ad‐hoc network .
It can be assigned two multiple ad‐hoc network types: (a) mobile ad‐hoc network (MANET) and (b) mobile ad‐hoc sensor network. A mobile ad‐hoc sensor network has much wider sequences of operational, and at the same time needs a less complex setup procedure compared to typical sensor networks, which communicate directly with the centralized controller . There are six main characteristics of MANETs : distributed operation; multi‐hop routing, autonomous terminal, dynamic topology, lightweight terminals, and shared physical medium.
MANET routing protocols can be categorized into three types:
The routing types  are: (a) proactive routing protocols (routing table‐based), (b) reactive routing protocols (demand based) are presented in Figure 2 and (c) hybrid routing protocols. These protocols are the combination of proactive and reactive routing protocols. One of them is ZRP (zone routing protocol).
To make routing decision, location‐based routing uses the actual position of nodes in any area. Location information can be obtained, for example, using global positioning system (GPS). Location‐aided routing (LAR) protocol is an example of location‐based routing.
Energy awareness‐based routing
Each node in the network supports multiple entries of routing in routing tables. For choosing optimal route in the wireless medium, routing assessing power levels of network nodes is available. In this case, routing table corresponding to the power level of nodes and maintained by transferring hello messages in between nodes at the power level. The number of entries in routing table of nodes is corresponding to the number of nodes reachable by using the power level. Thus, the number of entries in routing tables gives the total number of network nodes .
2.2. The characterization of Internet of Things (IoT)
Today a human is surrounded by various things—from the smallest items to the gigantic objects. The need to “recruit” these things was a great reason for the connection of electronics, devices, with digital communications, using the Internet as a main medium for data transmission. The human is just as data traffic end user in such connection, as all communication, management and information exchange are processing among connected things and objects. The capability of real or virtual things and objects to be identifiable, to communicate with anything and to interact with anything lets to build networks of interconnected objects, end users or other entities in the global Internet network. So the term “Internet of Things” mainly means the global infrastructure (Figure 3) of interconnected things, devices, or objects, which can communicate, actuate, exchange their information over Internet to the end users using the interaction between communication technologies and networks.
Internet of Things is the part of Future Internet (Figure 4) . The concept of Future Internet connects the Internet of Users and Knowledge (IoUK), Internet of Networks (IoN), Internet of Services (IoS) and Internet of Things. IoUK is used for people's social gaming or users monitoring, IoN opens possibilities for unlimited connectivity of networks and IoS is use for provision of web‐based services in the global smart industry. Broadly, Internet of Things covers the large potential of computing and communication capabilities into the objects, which can interoperate in global‐integrated communication platforms. It serves as a bridge between the real things and digital, information world.
Sensors are the main elements that connect things, their data with remote end users. The sensors collect useful information for the end users data, convert it to digital format and transmit it to the other devices in IoT‐based systems with the help of various existing wireless or wired technologies . As sensors are well deployed and it quantity is growing rapidly in the world, it serves as main interface, connecting things, communications and end users. The selection of medium for the data transmission, processing of data routing over different heterogeneous networks are one of the major challenges in the IoT‐based systems . Wireless technologies, ad‐hoc wireless networks are the most effective and low‐cost way to transmit data in Internet of Things systems. Furthermore, it perfectly solves human’s need for the mobility and significantly reduces the cost of installation of such systems, comparing it with the deployment cost of wired technologies.
The things, which are in the Internet of Things system, are identified and relations among them are specified in the digital domain; it has the ability to communicate to each other using wireless technologies as well to form different ad‐hoc wireless networks of interconnected things. Their sensing and actuating capabilities can be used for interaction with the surrounding environment. However, IoT‐based system needs to support main factors as heterogeneity of things and devices, efficient energy usage, interoperability and data management as well as security and privacy . The capability of the IoT systems to support these factors ensures IoT application in different areas of smart cities : healthcare, energy, buildings, transport, industry, etc. Moreover, the key technologies for Internet of Things‐based systems’ application in these areas are wireless sensor networks (WSNs) and MANETs [10, 11].
2.3. Internet of Things interaction with MANET and WSN
Possibilities of wide application of Internet of Things systems in different areas are directly dependent on the opportunities of interoperability between different communication technologies and networks in smart environments. The growth of sensors quantity leads to the increasing need of humans for a remote monitoring of different processes in smart environments. And this is possible by widespread deployment of wireless sensor networks (WSN). Basically, WSN is a network, which consists of different sensors that are capable autonomously to read information from the object, which is been measured, to handle sensed data, temporarily store it and transfer sensed data to another network node, which is also a sensor. As WSN is a normally centralized network , so the data, sensed and transferred from other sensors, are transmitted to the central node, which is usually called the sink. In this manner, the wireless sensors are able to communicate with each other and thus open very wide usability opportunities of wireless sensor networks in IoT systems. Wireless sensor networks mainly are the basic element in the global Internet of Things system, as sensors have the ability to gather information from different things and transmit it over the network. However, the reliability of IoT systems is highly dependent on the power consumption and scalability of WSN . The sensors should transmit measured data so efficiently to the sink, that the energy of their battery would be used at the minimum level. Due to this, the wireless sensor network should be constrained that it can easily accommodate changes in the network. This is related to the lifetime of WSN as well, as low or empty battery leads to the death of sensors. In this way, the routing principles and methods are very important and challenging issue of WSN as data should be transmitted by another sensor, eliminating dead sensor from the routing path. And it should be done with respect to Quality of Service (QoS) over wireless sensor networks .
Wireless sensor network in general is similar to a mobile ad‐hoc network (MANET), since both are self‐organized and multi‐hopped networks. However, the topology of MANET is more changeable than WSN. MANET protocols can let it to act as a WSN backbone  and access wireless sensor network's nodes as well exchange information with WSN about MANET entry points . Due to the task to use sensors’ energy efficiency during the data transmission and to reduce data processing time by selecting proper routing protocols and principles, it is a demand for the convergence of MANET and WSN networks. Also, these two networks can enable more effective and reliable cross‐network routing in the Internet of Things context. The intersection of MANET, WSN and Internet of Things the authors called as a MANET‐IoT system, which is discussed in detail in Section 3. Figure 6 presents the main aspects of interaction between Internet of Things, wireless sensor networks and mobile ad‐hoc networks.
Networking in the MANET‐IoT system is based on the routing protocols of MANET, routing principles of wireless sensor network and data sensing from things, handling and processing using Internet of Things. In general, networking of such the system is a very challenging regarding routing aspects. Also, it is related to system mobility and limited resources of all sensors in the network. MANET protocols (most of them) are designed with the focus on QoS [16, 17] and routing in wireless sensor networks is focused on the efficient energy consumption of network nodes . The connection of different things with limited features to the Internet and interaction with different wireless and mobile ad‐hoc networks must guarantee connectivity, accessibility and reliability of the MANET‐IoT system in smart environments. The solutions for the routing protocols of ad‐hoc network modification in order to fulfil the requirements of the Internet of Things were presented by Tian and Hou . Routing principles were changed by integrating IPv6 . However, the interaction of Internet of Things with MANET and WSN requires new, optimized solution for data routing in such the MANET‐IoT system. The authors proposed an algorithm for data routing, which is mainly focused on energy efficiency and safe weighted clustering in the MANET‐IoT system. The authors’ proposed solution is described in Sections 3 and 4.
3. Proposed solution for data routing in the MANET‐IoT system
3.1. Mathematical model for calculation of network energy cost function
Sensors establish and maintain routes can proactively or reactively. Proactive protocols periodically monitor peer connectivity to ensure the ready availability of any path among active nodes. Sensors advertise their routing state to the entire network to maintain a common or partially complete topology of the network. Reactive protocols establish paths only upon request. For MANET sensor network in the IoT system information routing we use combination of two routing principles: OLSR (optimized link‐state retrieval) and LEACH (low energy adaptive clustering hierarchy).
Clustering network is efficient and scalable way to organize WSN. Clustering is the method by which sensor nodes in a network organize themselves into hierarchical structures. By doing this, sensor nodes can use battery power more efficiently. A cluster head (CH) is responsible for conveying any information gathered by the nodes in its cluster and may aggregate and compress the data before transmitting it to the sink.
LEACH selects cluster head randomly among all nodes completely. Using our propose algorithm of energy efficient and safe‐weighted clustering routing for the mobile IoT system, the cluster head is a node that in actual time has more energy than the threshold value.
The sensing range of a sensor is the maximum distance that a sensor can sense. To form clusters, sensor nodes first elect a CH for each cluster. Nodes in the WSN which are not CHs find the closest CH within the range and become cluster members. The nodes in a cluster only communicate with one another and the CH. The number of CH can be different for every network topology. The propose algorithm implementing dynamical CH rotation that allows us to distribute the workload CH across the mobile MANET‐IoT system and extend overall lifetime of our system.
The MANET‐IoT network with a cluster topology is shown in Figure 7. Sensors are grouped into clusters and individual sensors sense data and transmit to cluster heads (CH). Cluster heads aggregate this data and then forward, depending on the tree structure, to the base station or sink node. We assume that each sensor senses L bits and transmit to CH.
The energy consumed by a sensor node consists of these parts :
radio transmission and receiving,
sensor logging and actuation.
We assume that energy used by CH is higher than that of a normal sensor node, because of additional data aggregation tasks per cycle from other sensors in parallel. Therefore, use coefficient
The coefficient φ 1 is related to the number of cluster sensors which sending data to CH at the same time. The coefficient φ 2 is related to scanning the ‘b’ bit packet of data and loading it into memory.
The communication of neighbouring sensor nodes is enabled by a sensor radio. Radio energy dissipation model is shown in Figure 8.
The set of sensor nodes be denoted by ℕ. Each node
For evaluation we assume that each sensor node has the same transmission range. The neighbours of node
The transient energy can be defined by
If in the network are
The total energy consumed by the entire network is
During data transfer phase, the nodes transmit messages to their cluster heads and the cluster heads transmit the aggregated messages to the sink. The data transfer energy consumed by a cluster head and node are defined by 
where energy consumptions in a data transfer stage are
The start energy E start is the energy of a sensor node at the initial start time. This energy should be sufficient for at least one round. In one round, a node becomes a member of head‐set for one time and a non‐cluster head for ( N _ C * m − 1)t times. An estimation of E start are used equation
Our goal is minimizing the E TN by using a dynamic clustering algorithm and dynamic cluster head selection algorithm, which is adaptive to the current MANET‐IoT system conditions, analysing sensor nodes battery energy state and reduce their energy consumption.
Based on the location of the sink node (or base station), the optimal cluster numbers are applied to the two different locations that are both the centre of the sensing area and the outside of the sensing area. The optimal cluster number for the centre of the sensing area is given by [28, 29]
The optimal cluster number for the outside of the sensing area is given by
Optimization model has also been used to study maximum lifetime conditions for sensor networks. The model balances the competing minimum energy and maximum information objectives by limiting the minimum information to be extracted to the station and minimizing the energy required to do this. The objective function is to maximize the network lifetime of the given wireless sensor network configuration 
where ∝ is the coefficient of energy, β is the coefficient of lifetime, δ is the coefficient of signal strength and ε the is coefficient of route hops.
In general, we analysed an impact factor; therefore, sensor node parameters tied optimum logarithmic function:
Because the optimum function will be transformed into a graph of weight function G(x, y, z, ϑ), Therefore, this function must be G(x, y, z, ϑ) > 0, and f(∝ , β, δ, ε) > 0. During the work that has been chosen continuous logarithmic function with the value for the application of the environment must be non‐negative. The range of parameter is very different : energy consumed by the node E TN is from 2 to 85%, T n n ‐ = from 1 to T γ of
The derived common analytical optimum function will be installing to the composite energy/lifetime efficient routing model. This function will be converted into the weight function, and this function will be used for calculations of sensor node values that are used in graph theory.
3.2. Proposed algorithm for data routing in the MANET‐IoT system
In developing energy aware route selection schemes, we assume that WSN is a graph with vertices indicating sensor nodes and edges representing communication links between vertices. Graphs are a suitable model to describe complex networks, such as WSN. The weight on a vertex denotes residual energy of that node and the weight on an edge indicates the amount of energy that a node requires to transmit a unit of information along the edge . The residual energy of a route is defined as the lowest energy level of any node on the route. The energy consumed along a route is the sum of weights on all the edges present on the route. The most appropriate energy aware route selection scheme for WSNs is to utilize those nodes having higher energy levels and avoid those having lower energy levels, such that the overall energy consumption along the data forwarding path is minimized. For solution of this problem we composite routing over MANET‐IoT networks using the combination of MANET and WSNs routing principles.
The proposed algorithm adopts a dynamical monitoring, with controls the energy of the cluster heads, and a predefined threshold value. The purpose of this monitoring mechanism is for transferring cluster head based on the comparison result between the energy of cluster head and threshold value.
The algorithm presented in Figure 9 has three phases: setup, steady and threshold. First step is a cluster head selection. After the cluster head selection phase, all the selected cluster heads send an advertisement message to all the non‐cluster head nodes in the field. Based on the received signal strength of the advertisement message, the non‐cluster head nodes decide their cluster heads for the current round and send back a join request message to their selected cluster heads informing their membership which leads to the formation of cluster. The message sent to the cluster heads includes the node's ID as well as the location of the sender node.
When all the sensor nodes are deployed, the entire network starts to select the cluster heads and carry out clustering and layering. Then, the nodes begin to periodically collect data and transmit them to the sink node. With the change of time, the network topology structure is also changing. If cluster head energy is lower than the predefined threshold value, the `third loop is applied to replace cluster head by another node, which poses the largest energy within the cluster. The new cluster head continues to cooperate with cluster members. This way protects the cluster heads, which have lower energy. This mechanism can protect cluster heads from quick death and prolong the network lifetime. The messages exchanges between nodes are shown in Figure 10.
When have all information about network and nodes, then are choosing the routing method for transmission information. In this research work, our proposed common route choosing algorithm is presented in Figure 11. For evaluation network lifetime three route path selection methods are used: NP (node place), BST (node battery state) and ER (energy resource). The NP aim to find route with minimum hop and for searching nodes, node location parameters or methods are used (RSSI, AoA and ToA). The cluster head evaluates all neighbour nodes that are in the cluster. If the information does not satisfy required criterions, cluster heads send message for the neighbour cluster head to help find route to the sink. BST selects node which battery state is the higher. Using the ER method we calculate all network energy resource using the proposed algorithm. In the new algorithm, a threshold value is added in order to monitor the energy of node.
4. Performance evaluation of routing algorithms
Simulation experiments are carried out using Matlab (2010b). The principal goal of these simulations is to analyse our algorithm and compare it with other. For analysing and comparing the performance of our proposed method we used two metrics: node energy and network lifetime (or the number of rounds). Network lifetime is one of the main characteristics to evaluate the performance of sensor networks. Such a parameter includes coverage, connectivity and node availability. The network lifetime T n n is defined as that the sensor network loses connectivity. The route lifetime is defined as the first node fails, thus
where T γ is the lifetime of node γ in
We test the proposed algorithm using an initial number of alive sensors
The network at which we apply our tests is shown in Figure 13.
Figure 13 shows the network topology structure. The green round circle denotes the sink. The blue round circle denotes the cluster heads. The red and yellow round circles denote the sensors, but red can be the cluster head also. The connection line denotes the path of a single hop from the sensor nodes to the cluster head. In the first scenario, sensors are sending information to the sink over three cluster heads. Figure 14 presents the simulation results (a) network lifetime, (b) each node battery energy and (c) dependency of node energy on the number of rounds.
As can been seen in Figure 14, using such information to the routing method network lifetime (dimension is days) is 216, and the fastest losing power nodes 3 and 7. During the analysis of this data, we observe that the consumption of energy distribution is unbalanced in the network and observable the weakness network location. The next simulation step was to use routing change over the simulation period, when the node energy level is lower than the threshold value. Figure 15 shows that after 90 rounds (a), the node 4 energy level is lower than the threshold value, therefore the sending information form node 7 we redirect from node 4 to node 3 and from nodes 11–7 to nodes 11–8. The next time (b) after 192 round we change other routes. Using this algorithm, our simulation network lifetime was 368 (c). The energy parameters are shown in Figure 16.
By comparing the results, we found that by using our proposed algorithm, the network lifetime is the longest than using simple or clustering without weight routing methods. The main objective of the dynamic cluster head rotation mechanism is to evenly distribute the energy load among all the sensor nodes so that there are no overly utilized sensor nodes that will run out of energy before the others. And we can see that the distribution of network nodes’ energy consumption becomes smoother (Figure 18). The assumptions made for compare different routing are as follows: network nodes are homogeneous and not mobility; they are equipped with power control; have active and sleep mode; each sensor has a unique identifier and uniformly deployed over the target area to continuously monitor the environment.
The second simulations are conducted for evaluating effectiveness of the proposed algorithm ER compare with other two (node place (NP) and battery state (BST)). The network topology is presented in Figure 19.
After such a network simulation we have seen over time as changing the number of nodes on the network (Figure 20). The first network node falls out after 15 round using the BP method and using our proposed algorithm ER after 23 rounds. When using the BST method the first node falls out from the network after 41, but then very suddenly battery energy of all nodes is ends. Network lifetimes of different methods are NP = 38, BST = 57 and ER = 63.
The average energy consumption of one node is shown in Figure 21, indicating the average energy at the time, which is utilized in the network for one node. Analysing this graph, we can see that the largest energy consumption is using the NP method. The BST method compared
As we can see in Figure 22 at the end of the network lifetime, there are nodes which energy is not zero and its can still be used in all three cases. It is an indicator of the best network energy resource utilization.
According simulation results, the NP and ER method network resource utilization is very similar. Using the BST routing method we can extend the time up to the first node falling out. This is important for the network when all sensors are the same and send the similar information.
In this chapter, we presented the proposed algorithm of energy efficient and safe‐weighted clustering routing for the mobile IoT system using a combination of MANET and WSN routing principles. We choose the clustering method, because each sensor nodes in a network organize themselves into hierarchical structures. The simulation result show that if we use combination method for information routing in the wireless sensor network, we increase the lifetime of sensors in overall Internet of Things system. Because we used dynamical cluster head selection, the weighting factors are added for routing from the sensor to the sink. When the network is heterogeneous and mobility, the using routing weight is very important, because sensors have different characteristics, dynamical distance from the sink and CH node and if we want to choose the best route we need to calculate some objectives function. And this function must have possibility to eliminating differences bound parameters. For solving this we used the weight function, and this function will be used for calculations of each sensor node value and then calculation all route cost function.
This work was partially supported by the ICT COST Action IC1304—Autonomous Control for a Reliable Internet of Services (ACROSS), November 14, 2013—November 13, 2017, funded by European Union.
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