扩散的分子通信模型的多跳可靠性和时延分析

Multihop Reliability and Delay Analysis of Diffusive Molecular Communication Model

扩散的分子通信模型是一种很有前景的纳米级通信典范.由于分子在生物环境中的随机性行为以及考虑发送方纳米机器在前面所有时隙释放的分子对当前时隙的码间干扰,分子通信容易遭受较高的不可靠性和较长的时延.因此,研究扩散的分子通信模型的多跳可靠性和时延显得尤为重要.首先,得到了扩散的分子通信模型在单链路及多跳链路场景下的可靠性和时延的数学表达式,并利用重传机制保证失败链路信息的可靠传输.其次,通过实验仿真结果展示了不同的参数,包括每个时隙发送的分子个数、生物环境的扩散系数以及两个纳米机器之间的距离对可靠性和时延性能的影响.最后,分别与基于病毒的分子通信模型和不考虑码间干扰的分子通信模型相比,在相同的通信场景下,扩散的分子通信模型达到相同的可靠性所花费的时延开销大大降低.

The diffusive molecular communication model is a promising paradigm of nano scale communication. Due to the stochastic behavior of the molecules in a biological environment and considering the inter-symbol interference of the molecules released by transmitter nanomachine to the current time slot from all the previous time slots,molecular communication easily suffers from high unreliability and long delay. Thus it is essential to investigate the multihop reliability and delay of diffusive molecular communication. First,the mathematical expressions of reliability and delay are obtained in the scenarios of single link as well as the multihop. The retransmission mechanism is used to ensure the reliable transmission of information for the failed link. Then,the simulation results show that different parameters including the number of molecules emitted in each time slot,diffusion coefficient in biological environment and the distance between transmitter nanomachine and receiver nanomachine have impacts on the reliability and delay. Finally,compared to the virus-based molecular communication model and the model without considering the inter-symbol interference,in the same scenario,the delay is greatly reduced by the diffusive molecular communication model under the same reliability.