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A mobility support scheme for 6LoWPAN
Wang Xiaonan ⇑, Zhong Shan, Zhou Rong
Changshu Institute of Technology, Jiangsu, Changshu 215500, China
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This paper proposes a mobility support scheme for 6LoWPAN. In the scheme, the control information interaction for the mobile handoff is achieved in the link layer, and the routing of the control information is automatically performed through the network topology, which saves the power and the delay time consumed by the routing establishment. In addition, neither does the mobile entity need a care-of address during the mobility process, nor is involved in the mobile handoff process, which reduces the mobile entity’s power consumption and prolongs its life span. From the theoretical and simulative perspectives, the paper analyzes the performance parameters, including the mobility handoff cost, the mobility handoff delay time and packet loss rate, and the analytical results show that the performance of the scheme is better than other schemes. Ó 2011 Elsevier B.V. All rights reserved.
Article history: Received 25 January 2011 Received in revised form 1 November 2011 Accepted 1 November 2011 Available online 7 November 2011 Keywords: 6LoWPAN Mobile handoff Tunnel Routing Link layer
1. Introduction Low-power wireless personal area networks (LoWPAN) are made up of sensing nodes compliant with standard IEEE 802.15.4  for wireless communications support. The LoWPAN nodes are characterized by small size, constrained power, limited computing and storage resources. Wireless sensor network (WSN) is a subtype of LoWPAN, and sensor nodes can interact with their environment by sensing or controlling some physical parameters. In general, sensor nodes cooperate to perform a common task . Some new paradigms are required to enable low-power devices to participate in the Internet. For example, the Internet of Things paradigm  has emerged if all the embedded devices and networks are natively IP-enabled and Internet connected. IPv6 is considered more suitable than IPv4 for LoWPAN networks  because it provides both larger address spaces and better auto-conﬁguration mechanisms. IPv6 over Low-power wireless personal area network (6LoWPAN) working group of the internet engineering task force (IETF) deﬁnes the manner in which IPv6 is carried out over IEEE 802.15.4 interfaces [5,6]. 6LoWPAN nodes have the following characteristics : (1) Small packet size. Given that the maximum physical layer packet is 127 bytes, the resulting maximum frame size at the media access control layer is 102 octets. The link-layer header imposes further overhead, which in the maximum case leaves 81 octets for data packets; (2) Support for both 16-bit short or IEEE 64-bit extended media access control addresses; (3) Low bandwidth. Data rates of 250 kbps, 40 kbps, and 20 kbps for each ⇑ Corresponding author. Tel.: +86 0512 55837603.
E-mail address: email@example.com (X. Wang). 0140-3664/$ - see front matter Ó 2011 Elsevier B.V. All rights reserved. doi:10.1016/j.comcom.2011.11.001
of the currently deﬁned physical layers; (4) Low power. Typically, some or all devices are battery operated; (5) Large number of devices expected to be deployed during the lifetime of the technology. Although 6LoWPAN helps making the IP-WSN end-to-end communication to the external world feasible, the excessive signaling costs for mobility support makes its implementation difﬁcult . Therefore, excessive signaling costs become a barrier for the application of IP-WSNs especially in the case of the mobility scenario of sensor nodes in different areas, such as in a patient’s body sensor network, etc. . Mobility support is important for the success of 6LoWPAN [8,9]. With the increasing demand for the mobile...