Abstract-This paper considers short-range (up to 100 µm) molecular communication where bio-nanomachines transmit and receive molecule-encoded messages and applies Stop-and-Wait Automatic Repeat Request (SW-ARQ) for feedback-based reliable communication in noisy intrabody environments. Three coommunication transports are considered: (1) diffusive transports where molecules diffuse via random thermal motion, (2) directional transports where molecules directionally move on pre-defined protein filaments with molecular motors and (3) diffusive-directional hybrid transports where molecules propagate with both diffusive and directional transports. Simulation results demonstrate that SW-ARQ improves latency and reliability in both diffusive and directional transports. Hybridization of the two transports aids extra improvements in latency and reliability.
This paper considers diffusive molecular communication where biologically-enabled machines (or bio-nanomachines) exchange information by means of molecules in aqueous environments. It is known that molecular communication is inherently stochastic and unreliable, thereby significantly degrading communication performance such as latency and jitter. This paper focuses on robustness against molecule losses and investigates a robustness enhancement protocol that performs forward error correction. The transmitter bio-nanomachine encodes molecules in a redundant manner with parity-check erasure codes, and the receiver bio-nanomachine recovers the information embedded in lost molecules. Simulation results show that the proposed protocol enhances robustness against molecule losses and in turn improves communication performance.
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