Efficient central resource management algorithm for time slotted system with high PER

摘要

This paper presents an approach for a MAC layer design for PLC communication systems based on the cross layer design within OSI-Layer 2 included mesh-under routing capability presented in [1]. The classical stop and wait protocol to realize automatic repeat request (ARQ) as feature of the medium access control layer (MAC-Layer) was replaced by a packet to stream protocol, flexible segmentation on requirements of transmission mode and time slots with a pipelined selective repeat protocol as link-layer. This link-layer was placed above the PHY-, MAC- and routing-layer. In [1] the link-layer design is detailed described and analyzed. As results, a throughput close to the theoretical limits for packet error rates of 0% to more than 90% was presented. The introduced technology model is used in the management systems for distributed power generators, smart meter and in many infrastructures where the devices are not only designed to communicate over a data network but also are developed to use into an internet of thinks. In this paper, we present our designed MAC protocol that avoids packet collision based on time slotted system with polling. The considered model takes into account the condition of deterministic communication behavior with ensured deliver time for commands and alarms. The proposed method reaches high efficiency even for unbalanced payload and different number of active slaves. The new designed protocol is tested in a discrete event simulation under different scenarios. The simulation results show an efficient data throughput even for channel with 20% packet error rate.