Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solv...Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solved by the specifications export, this paper proposed a MAC frame analytical method and a PHY protocol type detection algorithm based on parsing the IEEE 802.11packets captured by the library Libpcap. The packet structure and the length of the frame preamble (18 or 26 bytes) are presented. Then the methods of transforming byte-order and resolving sub-fields are given. A detection algorithm of PHY protocol type is proposed based on the experiments and examples are given to verify these methods. This work can be a reference for the R & D related to link layer frame analysis.展开更多
Security mechanism detection is not only an important content of vulnerabilities evaluation but also the foundation of key strength test for wireless local area network （WLAN）. This paper analyzes the specifications...Security mechanism detection is not only an important content of vulnerabilities evaluation but also the foundation of key strength test for wireless local area network （WLAN）. This paper analyzes the specifications of WLAN security mechanisms and points out the defects in design of security mechanisms detection algorithm based on the standards. By capturing and analyzing a large number of Beacon frames from different vendor＇s access points （APs）, we summarize the relevant fields and information elements in a Beacon frame, and present their values or status when an AP is set to every specific security mechanism. A detection algorithm of WLAN security mechanisms is proposed based on the experimental study result and the pseudo code of a reference implementation for the algorithm is designed. The validity of the algorithm is illustrated by examples, which shows it can detect every WLAN security mechanism accurately.展开更多
To reach necessary end-to-end connectivity between the Internet and wireless sensor networks （WSNs）, the Internet Engineering Task Force （IETF） IPv6 over low power wireless personal area network （6LowPAN） workin...To reach necessary end-to-end connectivity between the Internet and wireless sensor networks （WSNs）, the Internet Engineering Task Force （IETF） IPv6 over low power wireless personal area network （6LowPAN） working group has been established and introduced an adaptation layer for integration of IEEE 802.15.4 physical layer/media access control （PHY/MAC） layers and the upper layers of any Intemet protocol （IP）-based networks, such as the Internet. The energy efficiency is one of the most important performance measures in WSNs because most sensor nodes are only battery powered so we should reduce the energy consumption to the lowest to extend the life of nodes. Therefore the determination of MAC frame length should be carefully considered since that the radio frequency （RF） module consumes most the energy of a sensor node meanwhile the MAC protocol is the direct controller of RF module. In this paper, we provide a star-shaped 6LowPAN non-beacon mode with unslotted carrier sense multiple access with collision avoidance （CSMA/CA） mechanism to access to the channel and model the stochastic behavior of a target end node as the M/G/1 queuing system. Analytical expressions for some parameters such as channel busy probability, packet loss probability and energy efficiency are obtained in this paper and our analytical results can clearly show the impact of MAC frame length on the energy efficiency of a target node in both ideal and lossy channel.展开更多
太赫兹通信能够支持数10 Gbps的数据传输速率,能够满足人们对高带宽无线通信的需求,作为太赫兹无线通信的关键技术之一的MAC协议成为研究的热点.本文针对太赫兹无线通信固有的物理属性导致存在的时隙资源浪费及帧聚合不必要的重传问题,...太赫兹通信能够支持数10 Gbps的数据传输速率,能够满足人们对高带宽无线通信的需求,作为太赫兹无线通信的关键技术之一的MAC协议成为研究的热点.本文针对太赫兹无线通信固有的物理属性导致存在的时隙资源浪费及帧聚合不必要的重传问题,提出了一种可靠高时隙利用率的太赫兹无线个域网MAC协议——RHSU-MAC(Reliable and High Slot Utilization M AC protocol),减少了时隙资源的浪费,提高了传输的可靠性.最后,通过实际验证,将提出的M AC协议与现有的能够应用于太赫兹超高速无线网络的高吞吐量低时延MAC(high-throughput low-delay MAC,HLMAC)协议进行性能对比,为提出的M AC协议提供了支持.展开更多
针对现有多输入多输出(Multiple-Input Multiple-Output,MIMO)太赫兹通信网络双信道MAC协议存在波束重叠干扰和冗余控制开销等问题,提出了一种太赫兹网络中基于中继协作转发的双信道MAC协议(High Efficiency Dual channel MAC Protocol ...针对现有多输入多输出(Multiple-Input Multiple-Output,MIMO)太赫兹通信网络双信道MAC协议存在波束重叠干扰和冗余控制开销等问题,提出了一种太赫兹网络中基于中继协作转发的双信道MAC协议(High Efficiency Dual channel MAC Protocol Based on Relay Cooperative Forwarding in Terahertz Networks,HE-RCFMAC)。HE-RCFMAC协议包含动态帧聚合、基于位置信息自适应协作转发和精简RTS(Request To Send)/CTS(Clear To Send)帧三种机制。经三种机制处理后,可有效提升信道利用率,同时减小控制开销,提高数据传输成功率和整体网络吞吐量。仿真结果表明,所提协议与现有的MIMO太赫兹双信道MAC协议相比,MAC层吞吐量、数据传输成功率和信道利用率分别提升了12.82%、12.28%和8.73%,证明了所提协议的有效性。展开更多
为了解决节点高速移动和复杂的网络环境引起的地空数据链存在的隐蔽终端、频移、丢包以及编码错误等问题,提出2个重要的MAC层通信机制——MSDU(MAC services data unit)帧分段机制和RTS/CTS(request-to-send/clear-to-send protocol)握...为了解决节点高速移动和复杂的网络环境引起的地空数据链存在的隐蔽终端、频移、丢包以及编码错误等问题,提出2个重要的MAC层通信机制——MSDU(MAC services data unit)帧分段机制和RTS/CTS(request-to-send/clear-to-send protocol)握手机制。从小业务量和多业务量2个角度设置仿真实验并给出仿真分析。实验证明,MAC层通信机制能够有效解决隐藏终端等问题,并提高网络性能。展开更多
文摘Frame resolution and physical layer (PHY) protocol type detection are the basis of research and development of intrusion prevention systems for IEEE 802.11 wireless network. Aiming at the problems which cannot be solved by the specifications export, this paper proposed a MAC frame analytical method and a PHY protocol type detection algorithm based on parsing the IEEE 802.11packets captured by the library Libpcap. The packet structure and the length of the frame preamble (18 or 26 bytes) are presented. Then the methods of transforming byte-order and resolving sub-fields are given. A detection algorithm of PHY protocol type is proposed based on the experiments and examples are given to verify these methods. This work can be a reference for the R & D related to link layer frame analysis.
基金Supported by the National Natural Science Foundation of China(51377122)
文摘Security mechanism detection is not only an important content of vulnerabilities evaluation but also the foundation of key strength test for wireless local area network （WLAN）. This paper analyzes the specifications of WLAN security mechanisms and points out the defects in design of security mechanisms detection algorithm based on the standards. By capturing and analyzing a large number of Beacon frames from different vendor＇s access points （APs）, we summarize the relevant fields and information elements in a Beacon frame, and present their values or status when an AP is set to every specific security mechanism. A detection algorithm of WLAN security mechanisms is proposed based on the experimental study result and the pseudo code of a reference implementation for the algorithm is designed. The validity of the algorithm is illustrated by examples, which shows it can detect every WLAN security mechanism accurately.
基金Supported by the National Natural Science Foundation of China (61071090, 61171093)the National Science and Technology Major Projects (2011ZX03005-004-003)the Innovation Project of SCI and Tech for College Graduates of Jiangsu Province (CXLX12_0475)
文摘To reach necessary end-to-end connectivity between the Internet and wireless sensor networks （WSNs）, the Internet Engineering Task Force （IETF） IPv6 over low power wireless personal area network （6LowPAN） working group has been established and introduced an adaptation layer for integration of IEEE 802.15.4 physical layer/media access control （PHY/MAC） layers and the upper layers of any Intemet protocol （IP）-based networks, such as the Internet. The energy efficiency is one of the most important performance measures in WSNs because most sensor nodes are only battery powered so we should reduce the energy consumption to the lowest to extend the life of nodes. Therefore the determination of MAC frame length should be carefully considered since that the radio frequency （RF） module consumes most the energy of a sensor node meanwhile the MAC protocol is the direct controller of RF module. In this paper, we provide a star-shaped 6LowPAN non-beacon mode with unslotted carrier sense multiple access with collision avoidance （CSMA/CA） mechanism to access to the channel and model the stochastic behavior of a target end node as the M/G/1 queuing system. Analytical expressions for some parameters such as channel busy probability, packet loss probability and energy efficiency are obtained in this paper and our analytical results can clearly show the impact of MAC frame length on the energy efficiency of a target node in both ideal and lossy channel.
文摘太赫兹通信能够支持数10 Gbps的数据传输速率,能够满足人们对高带宽无线通信的需求,作为太赫兹无线通信的关键技术之一的MAC协议成为研究的热点.本文针对太赫兹无线通信固有的物理属性导致存在的时隙资源浪费及帧聚合不必要的重传问题,提出了一种可靠高时隙利用率的太赫兹无线个域网MAC协议——RHSU-MAC(Reliable and High Slot Utilization M AC protocol),减少了时隙资源的浪费,提高了传输的可靠性.最后,通过实际验证,将提出的M AC协议与现有的能够应用于太赫兹超高速无线网络的高吞吐量低时延MAC(high-throughput low-delay MAC,HLMAC)协议进行性能对比,为提出的M AC协议提供了支持.
文摘针对现有多输入多输出(Multiple-Input Multiple-Output,MIMO)太赫兹通信网络双信道MAC协议存在波束重叠干扰和冗余控制开销等问题,提出了一种太赫兹网络中基于中继协作转发的双信道MAC协议(High Efficiency Dual channel MAC Protocol Based on Relay Cooperative Forwarding in Terahertz Networks,HE-RCFMAC)。HE-RCFMAC协议包含动态帧聚合、基于位置信息自适应协作转发和精简RTS(Request To Send)/CTS(Clear To Send)帧三种机制。经三种机制处理后,可有效提升信道利用率,同时减小控制开销,提高数据传输成功率和整体网络吞吐量。仿真结果表明,所提协议与现有的MIMO太赫兹双信道MAC协议相比,MAC层吞吐量、数据传输成功率和信道利用率分别提升了12.82%、12.28%和8.73%,证明了所提协议的有效性。
文摘为了解决节点高速移动和复杂的网络环境引起的地空数据链存在的隐蔽终端、频移、丢包以及编码错误等问题,提出2个重要的MAC层通信机制——MSDU(MAC services data unit)帧分段机制和RTS/CTS(request-to-send/clear-to-send protocol)握手机制。从小业务量和多业务量2个角度设置仿真实验并给出仿真分析。实验证明,MAC层通信机制能够有效解决隐藏终端等问题,并提高网络性能。
