• The Journal of Korean Institute of Communications and Information Sciences
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• v.32 no.8A
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• pp.802-812
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• 2007

A Fast handover protocols for Mobile IPv6 networks can support seamless service by reducing handover latency to mobile nodes. To gain advantage derived from the fast handover in IEEE 802.16e networks, we propose a new fast handover protocol using a multiple simultaneous binding mechanism and a handover protocol based on trigger event for IEEE 802.21 in order to integrate IEEE 802.16e handover protocol and FMIPv6 handover protocol using link layer trigger. Through the numerical analysis, we compare performance of the proposed protocol and FMIPv6 protocol.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.13 no.6
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• pp.107-112
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• 2003

Handover in IEEE 802.11 requires repeated authentication and key exchange procedures, which are an obstacle to seamless services of wireless LAM. We propose a fast authentication and key exchange mechanism using IEEE 802.11f. Especially, by proposing a modified version of the 4-way handshake of IEEE 802.11i, we solve the perfect forward secrecy problem that arises when the pre-authentication is adopted. The scheme can be implemented only using the Context Block of IEEE 802.11f and the 4-way handshake of IEEE 802.11i without involving authentications server's interaction or non-standard behavior between access points. Our scheme is applicable to devices not supporting the us-authentication of IEEE 802.11i and also, it can substitute the pre-authentication when the pre-authentication is failed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.6B
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• pp.420-429
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• 2008

Currently, IEEE 802.11 Network could not support optimized tunneling scheme and buffering scheme based on movement detection to reduce multimedia data packet loss when an MN move from current subnet to new subnet during handover. It is because IEEE 802.11 did not transfer information of movement detection to AP. In this paper, we proposed new fast handover scheme by using advanced access point and optimized snoop protocol for network based Proxy Mobile IPv6 in IEEE 802.11 Networks. During handover, the proposed scheme reduces both the multimedia data packet loss rate and the packet reordering problems without changing MN's mobility stack in IEEE 802.11 Networks.

• Information and Communications Magazine
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• v.25 no.2
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• pp.11-17
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• 2008

최근 IT-BT-NT 융합의 대표적인 기술이며, wearable computing이나 healthcare와 같은 대표적인 응용분야를 포함하는 WBAN (Wireless Body Area Network)에 대해 IEEE 802.15.6 TG BAN을 중심으로 물리계층, 데이터 링크 계층, 네트워크 계층 및 응용 계층 등에 대해서 표준화가 진행되고 있다. IEEE 802.15 WG는 2006년 11월에 Wireless Medical BAN IG를 SG로 승인하였으며, 2007년 11월, 제51차 IEEE 802 WPAN 본회의에서 TG BAN으로 최종 승격하였다. 따라서, 본고에서는 IEEE 802.15.6 TG BAN을 중심으로 WBAN 국내외 표준화 활동에 대해 고찰하고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.7 no.5
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• pp.1108-1130
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• 2013

Wireless Body Area Networks (WBANs) are becoming increasingly important to solve the issue of health care. IEEE 802.15.6 is a wireless communication standard for WBANs, aiming to provide a real-time and continuous monitoring. In this paper, we present our development of a modified Markov Chain model and a backoff model, in which most features such as user priorities, contention windows, modulation and coding schemes (MCSs), and frozen states are taken into account. Then we calculate the normalized throughput and average access delay of IEEE 802.15.6 networks under saturation and ideal channel conditions. We make an evaluation of network performances by comparing with IEEE 802.15.4 and the results validate that IEEE 802.15.6 networks can provide high quality of service (QoS) for nodes with high priorities.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.6
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• pp.93-103
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• 2009

Recently, there is an increase in demand of real-time multimedia service in the WLAN environment, with a commercialization of IEEE 802.11n standard. However, the 802.1x authentication protocol is too slow to provide seamless real-time multimedia service, which defined in an IEEE 802.11i security standard. In this paper, a Ticket-based authentication mechanism in the CAPWAP(Control And Provisioning Wireless Access Point) architecture is introduced to support for the fast handoff.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.7
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• pp.1313-1319
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• 2017

In this paper, we evaluate the performance of multi-hop transmissions in IEEE 802.15.6 ultra wide band (UWB) wireless body area network (WBAN). The packet structure in the physical layer, and encoding and decoding are considered for multi-hop transmissions in IEEE 802.15.6 UWB WBAN. We analyze the data success rate and energy efficiency of multi-hop transmissions with considering the length of data payload, transmission power, and distances between the nodes in IEEE 802.15.6 UWB WBAN. Through simulations, we evaluate the data success rate and energy efficiency of multi-hop transmissions with varying the length of data payload, transmission power, and distances between the nodes in IEEE 802.15.6 UWB WBAN. Finally, we can select an energy-efficient multi-hop transmission in IEEE 802.15.6 UWB WBAN depending on the length of data payload, transmission power, and distances between the nodes.

• Journal of KIISE:Information Networking
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• v.32 no.3
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• pp.391-403
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• 2005

Several nv6 mobility support protocols for mobile Internet services are proposed in IETP : Mobile Ipv6, Hierarchical Mobile Ipv6, and Fast Handovers over Mobile Ipv6. Recently, IEEE 802.11 network has also been widely deployed in public areas for mobile Internet services. In the near future, IPv6 mobility support over IEEE 802.11 network is expected to be a key function to actualize the All If-based mobile various services. For appropriate application of these protocols, the IPv6 mobility support protocols should be analyzed according to their characteristics in terms of signaling, handover latency, lost packets, and required buffer sire as well as the impact of lower layer such as IEEE 802.11 network. In this paper, we analyze the performance of the protocols over IEEE 802.11 network. We define a packet-level traffic model, a network system model, and a mobility model. From these models, we construct a framework for the performance analysis. We also make cost functions to formalize each protocol's performance. Lastly, we analyze the effect of varying parameters used to show diverse numerical results, and compare with each other. From the analysis results, it is concluded that each Protocol has contrary or contrastive advantages with other Protocols, so there is no protocol that holds a dominant position.

• Journal of Korea Multimedia Society
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• v.13 no.2
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• pp.205-215
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• 2010

It is necessary to provide a fast and secure handover for seamless real-time multimedia services based on IEEE 802.11. In this paper, we propose FMIPv6 handoff protocol integrating L2/L3 layer based on IEEE 802.11 WLAN environment. In that, we propose a hierarchical key management scheme and authentication mechanism for protecting the handover signaling messages. The number of connections with AAA server is minimized for the fast handover. It is also compared and analyzed the handover cost with previous method.

• Information and Communications Magazine
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• v.24 no.6
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• pp.18-28
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• 2007

IEEE Std 802.15.4 표준기술은 저속 데이터 전송속도의 무선 통신 능력을 위한 표준을 정의한다. 본고에서는 IEEE 802.15.4 MAC 기능을 요약해서 기술한다. 또한 보안기술 부분은 IEEE 802.15.4-2006 규격을 기준으로 해서 간략히 설명하고, 2003 버전과의 차이점에 대해서도 비교 설명한다.