![]() ![]() In the design of the SDN control plane, the number of controllers plays a crucial role in maintaining Quality of Service (QoS) and network performance. A successful implementation and assurance of optimal performance in a complex SDWBAN largely depends on the appropriate design of the control plane. The SDWBAN becomes more complex as the number of applications and patients increase in the deployed area. The detailed functionalities of the SDWBAN framework can be found in. The SDESW then forwards/drops the data packet based on the retrieved instructions from the controller. The controller then processes the request and sends a packet_out response to the SDESW with appropriate action instructions. Upon receiving the data from body sensors, the SDESW checks for a match with the flow table and initiates a packet_in request to the controller in the case of mismatch. These sensors forward data to the connected SDESWs in order to reach out to the gateway. In a nutshell, the working procedure of SDWBAN is as follows: the WBAN sensors at the data plane form clusters and connect with SDESWs. On top of that, the healthcare authorities manage various sorts of applications through the application plane. The distributed controllers reside in the control plane which maintains communication with the underlying SDESWs in order to provide instructions for packet_in requests. The data plane of the SDWBAN framework holds the WBAN sensors, SDESWs and gateways. The SDWBAN framework consists of three planes that reflect the basic principle of the SDN architecture. The SDWBAN framework for patient monitoring applications simplifies the data packet forwarding functions from a source to a destination via SDN-enabled switches as shown in Figure 1. The proposed analytical model is validated by means of simulations in Castalia 3.2 and the outcomes indicate that the network achieves high level of Packet Delivery Ratio (PDR) and low latency for optimal number of controllers as derived in the mathematical model. To achieve this goal, the proposed mathematical model adopts the convex optimization method and incorporates three critical SDWBAN factors in the design process: number of controllers, latency and number of SDN-enabled switches (SDESW). This paper proposes a mathematical model to determine the optimal number of controllers for the SDWBAN framework in healthcare applications. The reason is that an optimal number of controllers assures the satisfactory level of performance and control of the network traffic originating from the underlying data plane devices. However, the performance of the SDWBAN framework largely depends on the controller which is a core element of the control plane. With the amalgamation of SDN with WBAN (SDWBAN), the patient monitoring and management system has gained much more flexibility and scalability compared to the conventional WBAN. For the past few years, SDN has shown a lot of merits in diverse fields of applications, an important one being the Wireless Body Area Network (WBAN) for healthcare services. Software-Defined Networking (SDN) offers an abstract view of the network and assists network operators to control the network traffic and the associated network resources more effectively.
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