基于TDMA的动态分子通讯的药物释放管理
Drug Release Management for Dynamic TDMA-Based Molecular Communication
摘要：
在本文中，我们设计了一种药物释放机制，用于动态时分多址接入（TDMA）的分子扩散通信（MCvD）。在所提出的方案中，通信帧被分成几个时隙，在每个时隙上，发射机纳米机器被调度通过将分子释放到介质中来传达其信息。为了优化释放的分子的数量和每个时隙的持续时间（符号持续时间），我们制定了一个多目标优化问题，其目标函数是每个发射机纳米机器的误比特率（BER）。基于释放的分子数量和符号持续时间，我们考虑了四种情况，即：“静态时间静态分子数量”（STSN），“静态时间动态分子数量”（STDN），“动态时间静态分子数量”（DTSN）和“动态时间动态分子数量”（DTDN）。我们考虑了三种类型的介质中的分子传播，即：“温和的扩散环境”（MDE），“中度扩散环境”（MODE），和“严重的扩散环境”（ESTA）。对于通道模型，我们考虑一个三维（3D）扩散环境，如血液，在三个方向上的漂移。仿真结果表明，STSN方法是最复杂的一种，BER约为$\text{10}^{\text{-2}}$，但DTDN是最复杂的情况，BER约为$\text{10}^{\text{-8}}$。
英文摘要：
In this paper, we design a drug release mechanism for dynamic time division multiple access (TDMA)-based molecular communication via diffusion (MCvD). In the proposed scheme, the communication frame is divided into several time slots over each of which a transmitter nanomachine is scheduled to convey its information by releasing the molecules into the medium. To optimize the number of released molecules and the time duration of each time slot (symbol duration), we formulate a multi-objective optimization problem whose objective functions are the bit error rate (BER) of each transmitter nanomachine. Based on the number of released molecules and symbol durations, we consider four cases, namely: "static-time static-number of molecules" (STSN), "static-time dynamic-number of molecules" (STDN), "dynamic-time static-number of molecules" (DTSN), and "dynamic-time dynamic-number of molecules" (DTDN). We consider three types of medium in which the molecules are propagated, namely: "mild diffusive environment" (MDE), "moderate diffusive environment" (MODE), and "severe diffusive environment" (SDE). For the channel model, we consider a 3-dimensional (3D) diffusive environment, such as blood, with drift in three directions. Simulation results show that the STSN approach is the least complex one with BER around $\text{10}^{\text{-2}}$, but, the DTDN is the most complex scenario with the BER around $\text{10}^{\text{-8}}$.
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