CoRE Working Group E. Dijk, Ed.
Internet-Draft Philips Research
Intended status: Informational A. Rahman, Ed.
Expires: June 23, 2013 InterDigital Communications, LLC
December 20, 2012
Miscellaneous CoAP Group Communication Topics
draft-dijk-core-groupcomm-misc-03
Abstract
This document contains miscellaneous text around the topic of group
communication for the Constrained Application Protocol (CoAP). The
first part contains, for reference, text that was removed from the
Group Communication for CoAP draft. The second part describes group
communication and multicast functionality that may be input to future
standardization in the CoRE WG.
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Internet-Draft Miscellaneous CoAP Group Communication December 2012
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Potential Solutions for Group Communication . . . . . . . . . 3
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Background . . . . . . . . . . . . . . . . . . . . . . . . 4
4.2. General Requirements . . . . . . . . . . . . . . . . . . . 5
4.3. Security Requirements . . . . . . . . . . . . . . . . . . 7
5. Group Communication Solutions . . . . . . . . . . . . . . . . 8
5.1. IP Multicast Transmission Methods . . . . . . . . . . . . 8
5.1.1. Serial unicast . . . . . . . . . . . . . . . . . . . . 8
5.1.2. Unreliable IP Multicast . . . . . . . . . . . . . . . 8
5.1.3. Reliable IP Multicast . . . . . . . . . . . . . . . . 9
5.2. Overlay Multicast . . . . . . . . . . . . . . . . . . . . 10
5.3. CoAP Application Layer Group Management . . . . . . . . . 10
6. DNS-SD Based Group Resource Manipulation . . . . . . . . . . . 13
7. Group Discovery and Member Discovery . . . . . . . . . . . . . 14
7.1. DNS-SD . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2. CoRE Resource Directory . . . . . . . . . . . . . . . . . 14
8. Deployment Guidelines . . . . . . . . . . . . . . . . . . . . 15
8.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2. Implementation in Target Network Topologies . . . . . . . 15
8.2.1. Single LLN Topology . . . . . . . . . . . . . . . . . 15
8.2.2. Single LLN with Backbone Topology . . . . . . . . . . 17
8.2.3. Multiple LLNs with Backbone Topology . . . . . . . . . 20
8.2.4. LLN(s) with Multiple 6LBRs . . . . . . . . . . . . . . 20
8.2.5. Conclusions . . . . . . . . . . . . . . . . . . . . . 20
8.3. Implementation Considerations . . . . . . . . . . . . . . 20
8.3.1. MLD Implementation on LLNs and MLD alternatives . . . 20
8.3.2. 6LBR Implementation . . . . . . . . . . . . . . . . . 21
8.3.3. Backbone IP Multicast Infrastructure . . . . . . . . . 22
9. Miscellaneous Topics . . . . . . . . . . . . . . . . . . . . . 22
9.1. CoAP Multicast and HTTP Unicast Interworking . . . . . . . 23
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 24
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