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fetching (step 30 in Figure 18.4 ) until the interaction has reached the LRI
(step 28 in Figure 18.4). This generates an appropriate service invocation
sequence of the LIS so that WAN A may have the same performance as
WAN B. WAN B's latency is 154.7 ms, which is around 1.3 times that of the
DMSO RTI. The relative performance of SOHR to the DMSO RTI on the
WAN is improved compared with the performance on the LAN. The com-
munication cost becomes the dominant overhead on the WAN because of
the long distance.
18.6
The major benei ts of the SOHR framework are summarized as follows:
Major Beneits of SOHR
The functionalities of an RTI are provided as grid services so that
distributed simulations can be conducted without any vendor-
specii c RTI software.
Grid services, which can pierce i rewalls, are used as the commu-
nication infrastructure so that distributed simulations can be con-
veniently conducted across administrative domains on a WAN.
The six HLA service groups are mapped to different modules in
the LRI structure and different management services so that
multiple combinations of a particular module of the LRI and its
corresponding management service can be implemented based
on different algorithms for an HLA service group. This plug-
and-play paradigm makes SOHR an extensible framework. A
user is able to choose the most suitable algorithm based on a
specii c federation scenario to optimize the performance. New
algorithms can be implemented and studied on SOHR, which
makes SOHR a good experimental environment for distributed
simulation research.
The decoupled design between a federate and its LRI makes the
LRC very lightweight so that a federate can be run on resource-
limited platforms such as PDAs and cellphones. Both HLA 1.3
and HLA 1516 service interfaces are supported in two different
LRC libraries. As the major local RTI processing is ofl oaded to the
LRI, the federate has more computation time for its real simula-
tion work. The LRI buffers callbacks for its federate, so federate
migration is simplii ed.
Handles of interaction classes, object classes, parameters, and
attributes are centralized in the DMRI, and grid service interfaces
 
 
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