Internetworking Between ZigBee/ and IPv6/802.3 Network

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Presentation transcript:

Internetworking Between ZigBee/802.15.4 and IPv6/802.3 Network Speaker:施創宏 Date:2010/9/9

Outline Introduction Related Works The Overlay Internetwork Design Example Of transmission Flows Conclusion Reference

Introduction IEEE approved the standard for the low-rate WPAN (LR-WPAN) as 802.15.4 in 2003. The design of ZigBee/802.15.4 is incompatible with the TCP/IP network.

Related Works IPv6 over ZigBee 6LoWPAN IP-Net A Translation Solution

IPv6 over ZigBee All the ZigBee nodes are assigned with an IPv6 address. According to the 802.15.4 specification, the maximum PHY service data unit is 127 bytes. In a data frame, after reducing the 23 bytes MAC header, 2 bytes frame check sequence (FCS), and 8 bytes NWK header, there are only 94 bytes left for the IPv6 packet. The ZigBee/802.15.4 does not support packet fragmentation.

6LoWPAN It focuses on defining the transmission of IPv6 Packets over IEEE 802.15.4 networks. It creates an adaptation layer above the 802.15.4 MAC to support the IPv6 data packet. Besides, it throws the ZigBee stack away. Without ZigBee NWK, all the routing structures, address assignment, and data forwarding must be redesigned.

IP-Net IP-Net is designed by the Helicomm Incorporated and used in their product. It is a dual stack approach. Both the 6LoWPAN design and ZigBee stack are working on the same 802.15.4 MAC. Although it endows a node with both IPv6 and ZigBee functions, only one of them can be used at the same time. Thus, it is not an internetworking solution.

A Translation Solution It is a NAT-PT like solution.

A Translation Solution The NAT-PT like design also breaks many end-to-end features such as information security. Service discovery, one of the most important functions in ZigBee network, is unsolved Also, the mechanism can not perform cross regions transmission, such as the communication between A and E.

The Overlay Internetwork Design C1.Each ZigBee node should be assigned with a global unicast IPv6 address. C2.Each IPv6 host which may communicate with ZigBee node should obtain a ZigBee address. C3.Service discovery should be propagated to different network domain. C4.Broadcast data in ZigBee network should be transferred to proper IPv6 hosts. C5.Data packet transformations in the gateways should be as simple as possible and should not break the end-to-end model above the transport layer.

IPv6 Prefix Delegation We make the gateway support the IPv6 prefix delegation function. The IPv6 address does not really exist on the ZigBee nodes. It is only a pseudo address at the gateway.

UPnP( Universal Plug and Play) The PAN ID is the keyword of the type of device in UPnP SSDP (Simple Service Discovery Protocol) discovery. When a gateway receives the SSDP discovery, it will transform the packet to ZigBee Service Discovery format and pass it to the 802.15.4 network. The transformation will keep the record in a table for a period so that the response ZigBee address assignment packet can reply to the proper IPv6 host.

UPnP( Universal Plug and Play) UPnP is also used in the two way service discoveries when an IPv6 host or a ZigBee node wants to find some services in another network. In this case, the service discovery functions which are defined in ZDO will be transformed to the XML format at the gateway for the SSDP discovery and vice versa.

IPv6 Multicast Because ZigBee is an ad-hoc wireless network, it has to support the broadcast function for many purposes. We set up an IPv6 multicast group for each PAN ID.

Extended IP Switching We use an IP-switching like mechanism to accomplish our purpose. All the data packet transformations are done below the network and the network layer, with simple header replacement just as IP Switching does.

From Zigbee/802.15.4 to IPv6/802.3 Network join Service discovery

From Zigbee/802.15.4 to IPv6/802.3 Data transfer

From IPv6/802.3 to Zigbee/802.15.4 Network join Service discovery

From IPv6/802.3 to Zigbee/802.15.4 Data transfer

Cross regions Network join Service discovery

Example Of transmission Flows

Cross regions Data transfer

Conclusion It is operative not only between ZigBee/802.15.4 and IPv6/802.3 but also multiple ZigBee/802.15.4 networks connected by IPv6/802.3 networks.

Reference RC Wang, RS Chang, HC Chao, Internetworking Between ZigBee/802.15. 4 and IPv6/802.3 Network Communication, 2007.