Collaboration services: Enabling chat in disadvantaged grids
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1 Collaboration services: Enabling chat in disadvantaged grids Frank T. Johnsen and Trude H. Bloebaum Norwegian Defence Research Establishment (FFI) Luka Cetusic, Hans Kristian Flaatten, Karsten Kjensmo, Erik Lothe, Ole Johnny Pettersen, Thomas Martin Schmid and Bjørn Tungesvik Norwegian University of Science and Technology (NTNU)
2 Outline Our paper presents our implementation of ACP142 and a chat application over that protocol. The work was performed in context of NATO/STO IST-118. Presentation outline Intro to IST-118 Background / observations ACP142 Chat solution Conclusion
3 IST-118 SOA recommendations for disadvantaged grids in the tactical domain NATO STO/IST-118 aims to provide recommendations and guidelines when it comes to extending the SOA paradigm into the tactical domain. The group currently consists of domain experts from the NATO Communications and Information (NCI) Agency, Germany, the Netherlands, Norway, Poland, and the United Kingdom. Interested in contributing/participating? Please contact the group chairman, Peter-Paul Meiler
4 NATO IST-118 The main focus is on identifying what we call tactical SOA foundation services. which core enterprise services do we need support for in the tactical domain? We aim to investigate how services from the SOA baseline can be extended for use in tactical networks Tactical SOA profile
5 NATO C3 Classification taxonomy Taxonomy excerpt showing the «Core Enterprise Services» part of the «Technical Services». Expanded view of the «Unified Communication and Collaboration Services».
6 Background Collaboration Text-based collaboration (instant messaging aka chat ) is an important aspect. Many different solutions, e.g., irc, XMPP, and others SOA baseline specification: collaboration services Identifies the extensible Messaging and Presence Protocol (XMPP) XMPP Client/server based. Not well suited for use in disadvantaged grids / DIL environments. Focus of IST-118: Enable core services in disadvantaged grids.
7 Observations Instant messaging can be one-to-one, but is more often one-tomany information dissemination Multicast an efficient means of distributing one message to many recipients. decentralized, no central server, thus no single point of failure. Many implementations exist, also of reliable multicast protocols. Disadvantaged grids low bandwidth, variable throughput, unreliable connectivity, and energy constraints Also, occasional need for radio silence (EMCON) We need A multicast protocol developed for use in tactical radio networks that can cope with mobility and disruptions.
8 ACP 142 / P_MUL The ACP142 protocol for reliable multicast has been designed specifically for use in tactical networks. Key properties Reliable multicast messaging Designed for bandwidth-constrained networks Delayed acknowledgement for EMCON environments Thus, the protocol has all the properties we need in a reliable multicast solution for one-to-many communication in disadvantaged grids. The specification defines the ACP142 for different transport protocols, including IP, which we focus on Everything over IP mindset.
9 ACP142 implementation on UDP/IP stack Contribution: An implementation of ACP142 in Java Free, open source, available at Note that the network hosts and routers must support IP multicast, as indicated above.
10 Testing
11 ACP142 ACP142 provides several parameters for fine-tuning the protocol s behavior (e.g., MTU size, sending delay between packet fragments, etc.) and it is necessary to configure it to match the capabilities of each network before deployment. For more protocol details, see the specification The Combined Communications-Electronics Board (CCEB), ACP142, P_MUL - A PROTOCOL FOR RELIABLE MULTICAST MESSAGING IN BANDWIDTH CONSTRAINED AND DELAYED ACKNOWLEDGEMENT (EMCON) ENVIRONMENTS Implementation and test details are in a technical report
12 P_MUL chat application Chat using ACP142. Topics mapped to multicast groups. Contribution Free, open source release Submitted for consideration to the NATO STO/IST-ET-070 exploratory team for tactical chat
13 A note on interoperability with XMPP
14 Conclusion Contribution open source: Implementation of ACP142 over UDP/IP, and P_MUL chat for use in disadvantaged grids leveraging the above protocol. Work performed in context of IST-118. Submitted for consideration to the NATO STO/IST-ET-070 exploratory team for tactical chat. Future work The IST-118 group plans to experiment with other Core Enterprise Services in disadvantaged grids in the tactical domain as well (such as the Publish/Subscribe service).
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