A guide for the selection of routing protocols in WBAN for healthcare applications

Human-centric Computing and Information Sciences, Aug 2017

In the present scenario, the term wireless body area network (WBAN) is becoming an integral part of human day to day life due its wide variety of applications, especially in the field of healthcare systems. To design such a reliable body area network system, there are a number of factors to be considered both in hardware and software levels. One of such factors still developing is the design and the analysis of routing protocols in the network layer. Routing protocols are a set of protocols which can identify and maintain the routes in the network so that the data can be exchanged between the nodes efficiently. Hence, routing protocol plays a vital role in the wireless sensor networks for reliable communication between the sensor nodes. In this paper, different routing protocols for body area networks are surveyed and observed that they are affected by factors like energy, network topology, various quality of services (QoS) in the nodes, node temperature, transmission range of nodes, human posture, etc. An evocative taxonomy of protocols is presented such as cluster-based, cross-layered, postural movement based, QoS aware and temperature-aware routing protocols. From the survey, it is found that the selection of a routing protocol is application dependent. For example, the energy efficient protocols like reinforcement learning based routing with QoS support or wireless autonomous spanning tree protocol can be used for daily health monitoring systems due to its high packet delivery ratio. If the system is for in vivo networks, routing algorithm for network of homogeneous and Id-less biomedical sensor nodes or mobility-supporting adaptive threshold-based Thermal-aware energy-efficient multi-hop protocols are the suitable ones. For critical and emergency cases, where accuracy with little delay is the major concern, the protocols like critical data routing, reliability aware routing, data-centric multi objective QoS-aware routing protocol, etc. can be rightly chosen. This entire survey paper can be used by the researchers as a reference for studying various WBAN routing protocols, especially in the field of medical health care systems.

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A guide for the selection of routing protocols in WBAN for healthcare applications

Bhanumathi and Sangeetha Hum. Cent. Comput. Inf. Sci. A guide for the selection of routing protocols in WBAN for healthcare applications V. Bhanumathi C. P. Sangeetha In the present scenario, the term wireless body area network (WBAN) is becoming an integral part of human day to day life due its wide variety of applications, especially in the field of healthcare systems. To design such a reliable body area network system, there are a number of factors to be considered both in hardware and software levels. One of such factors still developing is the design and the analysis of routing protocols in the network layer. Routing protocols are a set of protocols which can identify and maintain the routes in the network so that the data can be exchanged between the nodes efficiently. Hence, routing protocol plays a vital role in the wireless sensor networks for reliable communication between the sensor nodes. In this paper, different routing protocols for body area networks are surveyed and observed that they are affected by factors like energy, network topology, various quality of services (QoS) in the nodes, node temperature, transmission range of nodes, human posture, etc. An evocative taxonomy of protocols is presented such as cluster-based, cross-layered, postural movement based, QoS aware and temperature-aware routing protocols. From the survey, it is found that the selection of a routing protocol is application dependent. For example, the energy efficient protocols like reinforcement learning based routing with QoS support or wireless autonomous spanning tree protocol can be used for daily health monitoring systems due to its high packet delivery ratio. If the system is for in vivo networks, routing algorithm for network of homogeneous and Id-less biomedical sensor nodes or mobility-supporting adaptive threshold-based Thermal-aware energy-efficient multi-hop protocols are the suitable ones. For critical and emergency cases, where accuracy with little delay is the major concern, the protocols like critical data routing, reliability aware routing, data-centric multi objective QoS-aware routing protocol, etc. can be rightly chosen. This entire survey paper can be used by the researchers as a reference for studying various WBAN routing protocols, especially in the field of medical health care systems. Quality of service; Routing protocols; Wireless body sensor networks Introduction Physician Hospital Internet Emergency Data Server Tier - 3 EEG Hearing Vision ECG Glucose Blood pressure Sink node Coordinator Tier - 1 Tier - 2 Fig. 1 Wireless body area network architecture information towards the sink node. From the sink node the packets are transmitted to the corresponding health-center through internet or other communication techniques. According to the survey conducted by the Economic and Social Affairs Department of United Secretariat [ 2 ], after 10 years people with age above 65 will be approximately 15% of total world population. As, older people are more exposed to medical health issues, the need for low cost health monitoring devices [ 3 ] becomes a major part human life. WBAN is actually a subset of conventional wireless sensor networks (WSNs), which can be used for early detection of various diseases, for real-time patient monitoring of elderly people, etc. The body sensor node is either worn on the body surface or implanted inside the body. The sensed data is sent to the Base Station and is then forwarded to the sink node. The sink node is responsible for sending the information to its corresponding healthcare center. The reliability and efficiency of WBAN depend on how the system responds quickly and accurately, to send and receive the data between the nodes, which eventually depends on the selected routing protocols or algorithms. The process of sending information from either an in-body or an on-body sensor node includes the radiation emitted from wireless transceivers which is similar to WSNs. Although the routing protocols that are used in WSNs have been under study for past few years, these protocols cannot be used for WBANs due to its stringent requirements. For WSNs, the main focus is on minimal routing overhead and maximal throughput than reduced energy consumption [ 4 ]. Also, WSNs are mostly homogenous networks, the WBANs are heterogeneous too [ 5 ]. In this article, a comprehensive review of the existing recent routing protocols/algorithms is discussed. “The required evaluation metrics for healthcare applications” section discusses the performance metrics that should be considered for WBANs. The classification of the existing routing protocols is explained in “Classification of routing protocols” and “Future challenges and comparative analysis of routing protocols” sections gives the future challenges and a comparative analysis of different selected protocols. Finally, “Conclusions” concludes the survey. The required evaluation metrics for healthcare applications In order to identify the important metrics that have to be considered in WBANs during the design process, a general overview about the routing challenges in WBANs should be studied. The certain routing issues and challenges include network topology, postural body movements, limited resources, quality of service metrics, radiation and interference, global network lifetime, heterogeneous environment, etc. By analyzing all these factors we can conclude and list the important performance metrics to be considered while implementing the whole WBAN. The following section defines the metrics: • Network lifetime defines the total operation time of the network until the last node is dead. • Path loss is the difference between the transmitted power at the source node and received power at sink node. • Stability period is the time before first node die. • Residual energy is the difference between initial energy and used energy during the operation of the network. • End-to-end delay is the average time taken by a data packet to reach the sink from the source node. • Packet delivery ratio is determined by number packets obtained at the sink divided by the number of packets send from the source. Classification of routing protocols The classification of routing protocols can be done in different categories that correlate with the routing challenges of WBAN. The following section gives an overview about the existing protocols, which can be categorized as Cluster-based, Cross-layered, Postural movement based, quality of services (QoS) aware and Temperature-aware routing algorithms [ 6 ] as shown in Fig. 2. Cluster‑based routing protocols In both WSNs and WBANs, the limited energy source is the main constraint to be analyzed. Hence, several efficient cluster based schemes are proposed for both networks to minimize the power consumption and maximize the network lifetime [ 7 ]. While comparing hybrid indirect transmission [ 8 ] to power-efficient gathering in sensor information systems [ 9 ] and low-energy adaptive clustering hierarchy (LEACH) [ 10 ], it consumes less amount of energy if the number of nodes are small. However, AnyBody [ 11 ] protocol is better than LEACH, as the numbers of clusters remain constant with an increase in the number of nodes, but LEACH does not. Also, the installation cost is also less with AnyBody. The Table 1 shows an overview of the existing cluster-based protocols. Cross‑layered routing protocols These protocols use the concept of cross layering [ 13 ] which is already addressed in WSNs, where each layer (adjacent or non-adjacent) in the protocol stack shares their information unlike in the strict layered model. In WBANs, we can utilize the cross layering concept between network and medium access control (MAC) layers for routing and Clustered Cross layered Postural QoS aware Temperature CBBAP AnyBody HIT BioComm CICADA TICOSS WASP WBAN Routing Protocols ETPA PSR DVRPL OBSFR PRPLC Opportunistic ENSA Energy Efficient Multi-hop CDR TEEN ARBA Relay Based LAEEBA CO-LAEEBA Two-Hop MLAEEBA RAR (CICADA) [ 14 ] and time zone coordinated sleep scheduling [ 15 ] have less power consumption. Wireless autonomous spanning tree protocol (WASP) [ 16 ] has better packet delivery ratio and CICADA has less delay. Postural movement based routing protocols The body postural movements affect the network topology of the network, which results in link disconnection. The researchers introduced a cost function that is periodically updated for choosing the best route to forward packets to the sink. The protocols listed in Table 3 are the existing postural movement based routing protocols. Among the discussed protocols, on-body store and flood routing (OBSFR) [ 18 ] has better performance in reducing the packet delivery delay, but opportunistic postural movement based routing protocol has lower energy consumption than others. QoS aware routing protocols Presently, there are a number of diverse QoS aware protocols available in WSNs, which cannot be as such implemented in WBANs, but by considering its unique curbs it can. In WBANs different data types require different QoS [ 24 ]. Hence the proposed protocols should be aware of different types of QoS metrics for various types of data. The various QoS aware routing protocols are shortlisted as given in Table 4. The comparative analysis has shown that energy-aware peering routing protocol (EPR) [ 45 ], QoS-aware peering routing protocol for delay sensitive data (QPRD) [ 41 ] and QoS aware peering routing protocol for reliability sensitive data (QPRR) [ 38 ] have less power consumption when compared to other protocols. Some protocols do not consider energy consumption, while others. One of the most used QoS aware protocols is data-centric multi objective QoS-aware routing protocol (DMQoS) [ 50 ] because it can decrease the delay for delay-sensitive information, and similarly, it can provide reliable routing for reliable-sensitive information. The other QoS-aware protocols are used or selected for a particular network, according to the data type and its QoS requirements. Temperature‑aware routing protocols The antenna radiation, its absorption and interference are the major challenges to be considered while designing a body sensor network, since the radiated fields cause a temperature rise of node’s electronic circuitry. The field of radiation also has a strong impact on the human body [ 57 ] that may damage the human tissues due to its continuous exposure. The goal of all temperature-aware protocols is to decrease the temperature rise of in-body sensor nodes by avoiding routing through hotspots. Table 5 discusses the existing temperature-aware protocols. From the comparison of different protocols, it is seen that LTRT [ 58 ] performs much better than others while TARA [ 59 ] performs worst. In terms of temperature rise, HPR [ 60 ] shows less temperature rise in comparison with others. Finally, the latest M2E2 protocol [ 61 ] has proved that it is the best one among all thermal aware protocols, suitable for heterogeneous, multimode, energy efficient body sensor networks. Future challenges and comparative analysis of routing protocols The scope of this article is to open up new research areas in WBAN domain for routing protocol designs. Among all the routing protocols, the cluster based protocol HIT [ 8 ] aims at maximizing the network lifetime, but it does not consider the packet delivery ratio which is an important QoS metric. The second one, AnyBody [ 11 ] protocol considers the delivery ratio, but does not consider average delay, mobility and energy consumption. It leads to poor security measures. In order to optimize the performance of sensor networks for some specific applications, it is necessary to include the aforementioned metrics also in the design considerations. The cross layered concept is attaining great significance and interest among researchers due to its flexibility and effectiveness in sensor networks. The future research work aims at improving the reliability of CICADA [ 14 ] which performs better in terms of energy efficiency and average delay when compared to other cross layered protocols. 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rae ,)T re en n e ) a co w P a v iiilltyaeeb raaeunw TTTEPAM lr-aaehwm irtoongp iil-tsyuopb lr-taaehm (-TTEAMM lr-aaehwm ][56 rttseoopp R T M T H ) d T n R a T e s (L itv ] u l o ap [ 67 ] eeoong I[)]66N rtcoop ,)aTRd )(LTRA [)59RA m A g (L l A foh (sR itn lo co (T o ed o co to m u o rko on re rto rp irt r h w ro tu p g og te s ra ing itn la n en e t u r s p g uo ro n fom ilca tem re reu ituo h d e ru ta r irt e tu rta re re o m ro e p a lg io l- w a b a p m -a t l g ss o tem tte a itn l-e tts ]8 ts sa rm uo Id ae [5 ae le e h R L L T 0 T S 1 2 3 4 5 6 7 8 9 1 When IEEE 802.15.4 standard networks are used, it will be good if the TICOSS [ 15 ] protocol is redesigned for reducing the average delay which is not considered in the existing one. If the entire network performance is to be optimized, the choice will be the Biocomm protocols along with new techniques to reduce the node temperature. Hence, the scope for research in this area is very much wide enough to work with. The comparative analysis of postural movement protocols has shown that, none of them considered the thermal effects of nodes and QoS issues together. Therefore, the future protocols could be proposed in such a way that, it could achieve better QoS parameters along with techniques to reduce the node temperature rise and methods to counter security attacks. The survey on QoS aware protocols unveils various research areas for future work because of its importance. Every new protocol, which has been designed, is meant for addressing the limitation of the previous one. For example, in routing service framework [ 56 ] and reinforcement learning based routing with QoS support [ 55 ] the energy consumption is not considered, but it is taken into account in the remaining protocols. In almost, all the existing QoS aware protocols, only the QoS metrics are examined, without concentrating on the human body movements and temperature rise of implanted devices. The proposed temperature aware protocols perform better by reducing the temperature rise due to radiation from antenna and other node circuitry. Along with the thermal issue and power consumption, it will be better if these protocols can also address the routing issues like shortest path as in QoS aware. Table  6 summarizes the comparison between some of the routing protocols used in WBAN. From the analysis, it is seen that almost all the protocols have considered different QoS metrics for their performance analysis. Hence, choosing the protocol for a WBAN system depends on the particular application of the system; whether it should be energy efficient, good reliable one or it should reduce the temperature of the node circuitry. Table 7 lists the pros and cons and the application domain of each protocols used in body area networks. This table helps to choose a particular protocol based on the QoS requirements. For example, if the application of the proposed system is patient monitoring in hospitals, then the protocols like WASP [ 16 ] or TICOSS [ 15 ] can be selected due to its high packet delivery ratio and low average delay. If the sensors are implanted within the body, then the protocols like Co-LEEBA [ 33 ], TARA [ 59 ], or routing algorithm for network of homogeneous and Id-less biomedical sensor nodes (RAIN) [ 66 ] can be chosen. If the network is heterogeneous one, then M-ATTEMPT or M2E2 can be used. Conclusions Wireless body area network is a part of wireless sensor network, with a number of nodes deployed within and on the surface of human body to measure different biological parameters for a particular application. In this survey article, various existing routing protocols that are used in WBANs are categorized and briefly analyzed from the available articles between the years 2002–2016. It is seen that the routing protocol plays a vital role in the design process of every efficient, reliable, low cost wireless * * * * * * * Low Low Low Low Low Moderate Low * * Not applicable body sensor networks. Based on the structure and nature of networks, the routing protocols for WBANs are categorized as cluster-based, cross-layered, postural movement based QoS aware and temperature-aware protocols. It is observed that there is no strict classification of protocols is possible since most of them aims or results in achieving the challenges of sensor networks. It is also concluded that each protocol is application dependent, i.e., the protocols used for daily monitoring and the critical medical cases are different. The future directions for each group of protocols are also presented which helps the researchers to focus on their interested area. Also, a comparative study of different protocols has been examined so that an appropriate protocol can be selected according to the targeted application. This survey will benefit the researchers to study the existing routing protocols for WBANs in the field of healthcare systems. The Future work includes the design and implementation of a body sensor prototype with a newly designed routing protocol, which will be highly energy efficient and reliable one for rehabilitation of old age people using a microcontroller based system with suitable sensors. 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QoS: quality of services; RL-QRP: reinforcement learning based routing with Qos support; WASP: wireless autonomous spanning tree protocol; RAIN: routing algorithm for network of homogeneous and Id-less biomedical sensor nodes; M-ATTEMPT: mobility-supporting adaptive threshold-based thermal-aware energy-efficient multi-hop protocols; CDR: critical data routing; RAR: reliability aware routing; DMQoS: data-centric multi objective QoS-aware routing protocol; LEACH: low-energy adaptive clustering hierarchy; CBBAP: cluster based body area protocol; HIT: hybrid indirect transmission; PEGASIS: power-efficient gathering in sensor information systems; MAC: medium access control; CICADA: cascading information retrieval by controlling access with distributed slot assignment; TICOSS: time zone coordinated sleep scheduling; OBSFR: on-body store and flood routing; ETPA: energy efficient thermal and power aware routing; PSR: prediction based secure and reliable routing framework; DVRPLC: distance vector routing with postural link costs; PRPLC: probabilistic routing with postural link costs; ENSA-BAN: efficient next hop selection algorithm; TEEN: threshold sensitive energy efficient sensor network protocol; ARBA: adaptive routing and bandwidth allocation protocol; LAEEBA: link-aware and energy efficient scheme for body area networks; Co-LAEEBA: cooperative link-aware and energy efficient protocol for WBAN; MLEEBA: modified LAEEBA: link aware and energy efficient scheme for BAN; ZEQoS: Zahoor energy and QoS-aware routing protocol; QPRR: QoS aware peering routing protocol for reliability sensitive data; DARE: distance aware relaying energy efficient protocol; SIMPLE: stable increased-throughput multi-hop protocol for link efficiency; QPRD: QoS-aware peering routing protocol for delay sensitive data; QRP: Q-learning based routing protocol; AMR: adaptive multihop tree-based routing; EPR: energy-aware peering routing protocol; EAWD: energy-aware topology design; EBRAR: energy-balanced rate assignment and routing protocol; EERS: energy-efficient routing scheme; MDGRA: modified Dijkstra’s global routing algorithm [ 49 ]; RACOON: random contention-based resource allocation protocol; EAR: environment-adaptive routing algorithm; LOCALMOR: localized multi-objective routing protocol; RE-ATTEMPT: reliability enhanced-adaptive threshold based thermal unaware energy-efficient multi-hop protocol; TMQoS: thermalaware multi constrained intra body QoS routing protocol; M-ATTEMPT: mobility-supporting adaptive threshold-based thermal-aware energy-efficient multi-hop protocol; THSR: thermal-aware shortest hop routing algorithm; HPR: hotspot preventing routing; LTRT: least total-route temperature routing protocol; LTR: least temperature routing protocol; ALTR: adaptive least temperature routing protocol; TARA: thermal-aware routing algorithm. Authors’ contributions VB conducted the survey work, analyzed the schemes and drafted the manuscript. CPS participated in literature review and helped to draft the manuscript. Both authors read and approved the final manuscript. Authors’ information V. Bhanumathi received the Bachelor Degree in Electronics and Communication Engineering from Madras University, Master Degree in Communication Systems from Anna University, Chennai and Ph.D. in Information and Communication Engineering from Anna University, Chennai. She is currently working as an Assistant Professor in the Department of Electronics and Communication Engineering, Anna University, Regional Campus, Coimbatore. She has published her works in various International Journals and conferences. Her areas of interest are Wireless Communication, VLSI Design, Network Security, and Digital Communication. C. P. Sangeetha received her Bachelor Degree in Electronics and Communication and Master Degree from Cochin University of Science and Technology, Kerala. She is currently doing her Ph.D. in Information and Communication Engineering, Anna University, Chennai. She has worked as a Lecturer in Electronics and Communication Engineering, Toc H Institute of Science and Technology, Cochin for 8 years. She has published a number of papers in various International Journals and conferences. Her areas of interest include wireless sensor networks and mobile communications. Acknowledgements We would like to thank the editors and the reviewers for their noble comments and constructive criticisms for improvement of the manuscript. Competing interests The authors declare that they have no competing interests. Publisher’s Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. 1. 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V. Bhanumathi, C. P. Sangeetha. A guide for the selection of routing protocols in WBAN for healthcare applications, Human-centric Computing and Information Sciences, 2017, 24, DOI: 10.1186/s13673-017-0105-6