In order to support safety-related ATS services the AGR must support seamless aircraft handovers between coverage areas of Ground Earth Stations (GES) and/or GESs of different service providers, also providing uninterrupted IP connectivity in case of switch-over to redundant GES upon primary GES failure.
The MTE provides a full external IPv6/MIPv6 environment for detailed functional testing of the AGR, including enhancements to the AGR for fast net entry, fast handovers, fast GES switchover and header compression that will be implemented within a separate Routing Enhancements for Iris Link (REIL) unit. Moreover, the MTE will allow for adjusting and testing parameters related to QoS provision and the DiffServ concept.
The figure below shows the MTE components and their relationships to AGR and REIL.
click for larger image
The following components will be produced within the MTE task:
- Mobile Node (MN)
- Home Agent (HA)
- Correspondent Node (CN)
These components will be implemented on standard PC platforms, using standard LINUX features together with necessary supplementary software packages:
- Ground-ground Router (GGR)
Representative GGR will be purchased as a COTS product and will be configured within the MTE task. Following components will be produced outside the MTE task, but will become “Device Under Test” within MTE:
- Air-ground Router (AGR)
- Routing Enhancements for Iris Link (REIL)
Some components of the SATCOM ground segment are external to the MTE task:
- Network Control Centre (NCC)
- Ground Earth Station (GES)
- Aircraft Earth Station (AES)
GES and AES will be neither implemented nor emulated within the MTE task - wired connections will be used between involved MNs and AGRs. Impact of these components as well as mobile channel impact will be taken into account via configurable excess delay for both forward link and return link, configurable packet error rate, as well as by emulating packet loss/duplication/ reordering between MN and AGR.
NCC functionality during GES switchover/AES handover – e.g. detecting GES-AES connectivity changes or GES failure detection – will be emulated up to the necessary extent.