Abstract
As the bandwidth and scalability constraints become important design concerns in airborne networks, a new technology, called Avionics Full Duplex Switched Ethernet (AFDX), has been introduced and standardized as a part 7 in ARNIC 664. However, since previous research interests for AFDX are mainly bounded for analyzing the response time where flows information is given, configuration problem for both Maximum Transmission Unit (MTU) and Bandwidth Allocation Gap (BAG) over virtual links in AFDX networks has not been addressed yet even though it has great impact on required bandwidth. Thus, in this paper, we present two configuration approaches to set MTU and BAG values on virtual links efficiently while meeting the requirement of AFDX. The first is to search available feasible configuration (MTU, BAG) pairs to satisfy application requirements as well as AFDX switch constraints, and the second is to get an optimal pair to minimize required bandwidth through well-known branch-and-bound algorithm. We analyze the complexity of the proposed algorithm and then evaluate the proposed algorithm by simulation. Finally, we prove that the proposed schemes are superior to general approach in the aspects of speed and required bandwidth in AFDX networks.
Highlights
Due to increasing demands in Aircraft Data Networks (ADNs), such as high available bandwidth, minimum wiring to reduce the weight, and low development cost, typical communications technologies are expected to be replaced by new one
Since previous research interests for Avionics Full Duplex Switched Ethernet (AFDX) are mainly bounded for analyzing the response time where flows information is given, configuration problem for both Maximum Transmission Unit (MTU) and Bandwidth Allocation Gap (BAG) over virtual links in AFDX networks has not been addressed yet even though it has great impact on required bandwidth
Sine we focus on real-time AFDX messages, a message flow fi is defined by, where li is the payload of the message in bytes and pi is Message Transmit Cycle (MTC) of the message in msec
Summary
Due to increasing demands in Aircraft Data Networks (ADNs), such as high available bandwidth, minimum wiring to reduce the weight, and low development cost, typical communications technologies are expected to be replaced by new one. In [9], they obtain worst-case latency and output jitter for the network messages by defining a realtime model for a communications network based on AFDX Another approach in [10] is performance evaluation system through simulation with popular NS-2 and analysis of impact of several system parameters such as scheduling algorithm. Since most of existing research work has assumed the preconfigured networks in advance, configuration problem should be mentioned prior to deployment To achieve this goal, in this paper, we focus on two main problems: (i) finding feasible BAG and MTU parameters of virtual links in an AFDX switch for given virtual links of messages and (ii) providing an optimal solution in feasible pairs to minimize the total bandwidth.
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