Aerospace and Electronic Systems - March 2019 - 11
Annighoefer et al.
Figure 4.
Steps of self-organization mechanism.
Figure 5.
Example of topology discover algorithm.
SELF-CONFIGURATION MECHANISM (ORGANIZATION
PHASE)
Self-configuration requires the connection of the CORG to
the backbone network of the AAP instance and the availability of the desired applications in the CORG repository.
The CORG carries out the six sequential organization
steps depicted in Figure 4.
TOPOLOGY DISCOVERY (STEP 1)
A topology discovery algorithm determines the actual
topology graph T ¼ ðV; EÞ. The vertices V are the modules and module interfaces. The edges E ¼ ðVn ; Vm Þ
are the connections. First, each device i is assigned an
unique address Vi . In a second step, each device informs
CORG about its direct neighbors in the form of a subgraph
TVi ¼ ðfVi ; Vi;1 ; . . . ; Vi;m ; Vni . . . ; Vni g; fðVi ; Vi;1 Þ; . . . ;
1
l
ðVi ; Vi;m Þ; ðVi;1 ; Vni Þ; . . . ; ðVi;m ; Vni ÞÞgÞ. j ¼ 1 . . . m are
1
l
all connected communication interfaces of device i.
ni1 . . . :nil are the interfaces of the direct neighbors of the
interfaces 1 to m. Since all connections are point-to-point,
the neighbor is unique. The CORG fuses the subgraphs
TV1 to TVk to the complete topology T including modules,
interfaces, and communication links by matching the
MARCH 2019
neighbors with the root nodes of the other subgraphs.
An example is depicted in Figure 5.
PERIPHERAL DISCOVERY (STEP 2)
Most peripherals are able to identify themselves with an
ID declaring their unique existence, position, and purpose.
These are so-called smart peripherals. Legacy peripherals
have no possibility to identify themselves, e.g., analog
temperature sensors. Therefore, two variants for peripheral integration exist. Smart peripherals identify themselves by a type ID. The data retrieval and forwarding is
realized by a special peripheral application (P-APP)
matching the type ID. Legacy peripherals must be registered manually on the CORG, i.e., their connected IOM
and interface need to be entered. The type ID, interface
ID, and IOM ID form a unique ID for each peripheral.
APPLICATION DISTRIBUTION (STEP 3)
The CORG device has a repository of applications in the
form of compiled C-APPs and P-APPs. According to the
detected peripherals, the required P-APPs are distributed
to the IOMs of the associated peripherals and are executed. For the C-APPs, a list configures which of them
shall be included in the current AAP instance. The CORG
IEEE A&E SYSTEMS MAGAZINE
11
Aerospace and Electronic Systems - March 2019
Table of Contents for the Digital Edition of Aerospace and Electronic Systems - March 2019
Contents
Aerospace and Electronic Systems - March 2019 - Cover1
Aerospace and Electronic Systems - March 2019 - Cover2
Aerospace and Electronic Systems - March 2019 - Contents
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