Equilibrium Theory based Power Sharing Allocation Algorithm for Wireless Capsule Endoscopy Relays

Wireless capsule endoscopy (WCE) is an effective tool for gastrointestinal diseases diagnosis. Compare to the traditional endoscopy, more and more patients and medical institutions prefer WCE due to its user-friendly and non-cross infection. However, the size limitation of WCE would lead to a problem of insufficient energy. This paper will propose an relay-based power allocation algorithm for WCE transmission system based on market equilibrium scheme. Considering power resources of a WCE as assigned resources and the WCE transmission networks revenue is defined by a logarithm utility function. Either relay and direct transmission links aim to maximize its own profit by power resources sharing. In order to solve the multi-objective optimization problem, the optimization problem can be divided into two single-objective problems: firstly, maximizing the profit of the direct link; secondly, maximizing the profit of the relay-based links. The multi-objective optimisation problem can be solved by calculating the equilibrium point of the power utility function. The convergence of the algorithm can be verified by numerical results.