6LoWPAN에서의 게이트웨이를 이용한 라우팅 프로토콜(GARPAN)
GARPAN: Gateway-Assisted Routing Protocol for 6LoWPAN
초록/요약
ZigBee has recently emerged as a widely recognized forum that is formalizing IEEE802.15.4 devices for interoperability and compatibility amongst a number of vendors and designers. Under the auspices of IETF working group of 6LoWPAN, efforts are underway to provide interconnectivity between low powered IEEE802.15.4 devices and wired IPv6 domain. Besides a plethora of interoperability issues, routing stands out as a challenging consideration. AODV has been accepted as a viable candidate amongst reactive routing protocols for networks that comprise limited form factor devices. All the variants of AODV implement minimalist functionality to meet design constraints of various networks by obviating several of its packet types, service primitives and functionalities. In this thesis we propose a routing protocol named GARPAN. It is also an extension to the existing routing protocols for 6LoWPAN. In this protocol, we have discussed the routing approaches adopted in current ZigBee device specifications and existing work under the 6LoWPAN charter. We also propose the role of gateways to form part of intra-6LoWPAN routing entities. Gateways having wired connection can be a better medium to route the data from source to destination. GARPAN which utilizes the concept of multihop routing consists of two approaches. First, gateway-assisted active routing in which gateways act as FFD and broadcasts beacon signals periodically. Second approach is gateway-assisted passive routing in which gateways work in passive mode. We hypothesize that wired network can render better network parameters as compared to wireless networks and wired network area more reliable medium to route the traffic rather than wireless. Through NS2-based simulation study, our performance analysis amenably supports the applicability of our protocol.
more목차
1 Introduction 1
1.1 Wireless Sensor Networks 1
1.2 Routing in Wireless Sensor Networks 2
1.2.1 Routing 2
1.2.2 Routing Challenges 3
1.3 IEEE 802.15.4 5
1.4 ZigBee 6
1.5 IPv6 8
1.6 PAN and 6LoWPAN 8
1.6.1 Overview of 6LoWPAN 10
1.7 Routing Considerations in 6LoWPAN Environment 10
1.7.1 Contribution of the Thesis 11
1.8 Organization of the Thesis 13
2 Related Work 14
2.1Wireless Sensor Network Model 14
2.1.1 Applications of a Sensor Network 16
2.1.2 Routing Protocols in WSNs 18
2.2 IPv6 in6LoWPANs 20
2.2.1 Design Considerations of 6LoWPAN 22
2.2.2 Challenges of 6LoWPAN 23
2.3 IEEE802.15.4 and ZigBee 23
2.3.1 Key Features of IEEE802.15.4 23
2.3.2 ZigBee Stack over IEEE802.15.4 25
2.4 Packet Format used for Routing in 6LoWPAN 27
2.5 Routing Protocols for 6LoWPAN 28
2.5.1 AODV over IEEE 802.15.4 29
2.5.2 LOAD 29
2.5.3 TinyAODV 30
2.5.4 AODVjr 30
2.5.5 DYMOlow 31
2.5.6 Summary of Routing Protocols in 6LoWPAN 32
2.5.7 Comments on Routing Protocols in 6LoWPAN 34
3 GARPAN: Gateway-Assisted Routing Protocol for 6LoWPAN 35
3.1 Routing in 6LoWPAN 35
3.1.1 Multihop Routing 36
3.2 Routing Via Gateways 38
3.2.1 Advertisement-based Gateway Selection for PAN Registration 40
3.2.2 Scenario for Routing Through Gateways 40
3.3 GARPAN 41
3.3.1 Gateway-Assisted Passive Routing 41
3.3.2 Gateway-Assisted Active Routing 44
4 Performance Evaluation 49
5 Conclusion 53
References 54
