Route-Over Forwarding Techniques in a 6LoWPAN
6LoWPAN plays a major role within the protocol stack for the future Internet of Things. Its fragmentation mechanism enables transport of IPv6 datagrams with the required minimum MTU of 1280 bytes over 802.15.4-based wireless sensor networks. With the envisioned goal of a fully standardized WSN protocol stack currently necessitating a route-over approach, i.e. routing at the IP-layer, there are two main choices for any 6LoWPAN implementation with regard to datagram fragmentation: Hop-by-hop assembly or a cross-layered direct mode, which forwards individual 6LoWPAN fragments before the whole datagram has arrived. In addition to these two straightforward approaches, we propose enhancements based on adaptive rate-restriction for the direct forwarding and a retry control for both modes to reduce the number of losses of larger datagrams. Our evaluation of the basic and enhanced forwarding modes within simulations and a hardware testbed indicate that the proposed enhancements can considerably improve packet reception rate and latency within 6LoWPAN networks.
Keywords6LoWPAN fragmentation 802.15.4 CometOS forwarding route-over wireless sensor networks
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- 1.Montenegro, G., Kushalnagar, N., Hui, J., Culler, D.: Transmission of IPv6 Packets over IEEE 802.15.4 Networks. RFC 4944 (Proposed Standard) (September 2007)Google Scholar
- 2.IEEE Standard for Local and Metropolitan Area Networks— Part 15.4: Low-Rate Wireless Personal Area Networks (2011)Google Scholar
- 3.Winter, T., Thubert, P., Brandt, A., Hui, J., Kelsey, R., Levis, P., Pister, K., Struik, R., Vasseur, J., Alexander, R.: RPL: IPv6 Routing Protocol for Low-Power and Lossy Networks. RFC 6550 (Proposed Standard) (March 2012)Google Scholar
- 4.Shelby, Z., Hartke, K., Bormann, C.: Constrained Application Protocol (CoAP) (May 2013), http://tools.ietf.org/pdf/draft-ietf-core-coap-17.pdf (accessed: June 11 2013)
- 5.Bormann, C.: 6LoWPAN Roadmap and Implementation Guide (draft) (April 2013), http://tools.ietf.org/pdf/draft-bormann-6lowpan-roadmap-04.pdf (accessed: May 30, 2013)
- 7.Bhunia, S.S., Sikder, D.K., Roy, S., Mukherjee, N.: A comparative study on routing schemes of IP based wireless sensor network. In: 2012 Ninth International Conference on Wireless and Optical Communications Networks (WOCN), pp. 1–5 (September 2012)Google Scholar
- 8.Thubert, P., Hui, J.: LLN Fragment Forwarding and Recovery (draft) (February 2013), http://tools.ietf.org/html/draft-thubert-roll-forwarding-frags-01 (accessed: June 11, 2013)
- 10.Gnawali, O., Fonseca, R., Jamieson, K., Moss, D., Levis, P.: Collection tree protocol. In: Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems, SenSys 2009, pp. 1–14. ACM, New York (2009)Google Scholar
- 11.Unterschütz, S., Weigel, A., Turau, V.: Cross-Platform Protocol Development Based on OMNeT++. In: Proceedings of the 5th International Workshop on OMNeT++ (OMNeT++ 2012) (March 2012)Google Scholar