CRAWDAD sunysb/multi_channel

Data set consisting of measurements from two different wireless mesh network testbeds (802.11g and 802.11a).We conduct measurement using two mesh network testbeds in two different frequency bands - 802.11g in 2.4GHz band and 802.11a in 5GHz band.date/time of measurement start: 2008-04-26 date/time of measurement end: 2008-05-06 collection environment: Multi-channel multi-radio architectures have been widely studied for 802.11-based wireless mesh networks to address the capacity problem due to wireless interference. They all utilize channel assignment algorithms that assume all channels and radio interfaces to be homogeneous. However, in practice, different channels exhibit different link qualities depending on the propagation environment for the same link. Different interfaces on the same node also exhibit link quality variations due to hardware differences and required antenna separations. To study these variations, we conduct measurement using two mesh network testbeds in two different frequency bands 802.11g in 2.4GHz band and 802.11a in 5GHz band. network configuration: The 802.11a testbed consists of 13 nodes each of which is a Soekris net4801 single board computer (SBC). The PCI-slot in the SBC is expanded into 4 miniPCI slots using a PCI-to-miniPCI adapter. Four 802.11a/b/g miniPCI wireless cards based on Atheros chipset with external antennas are used in each mesh node. The transmit powers are fixed to 15 dBm and data rate to 6 Mbps. The 802.11g testbed uses 10 Dell latitude D510 laptops each with one Atheros chipset based D-link DWL AG660 PCMCIA 802.11a/b/g card with an internal antenna. The transmit powers are fixed to 15 dBm and data rate to 11 Mbps. data collection methodology: Measurements from the 802.11g testbed were collected on 54 different links on three orthogonal channels 1, 6, 11 (2412, 2437 and 2462 MHz respectively) in the 802.11g band. Measurements from the 802.11a testbed were collected on 78 different links in 13 orthogonal channels (between 5180-5825 Mhz) in the 802.11a band. We used standard linux tools such as iperf to send UDP packets on the sender node for each link measured and tcpdump on the receiver node running on a raw monitoring interface to capture the packets. We conduct measurement using two mesh network testbeds in two different frequency bands at 802.11g in 2.4GHz band and 802.11a in 5GHz band.Tracesetsunysb/multi_channel/linkTrace set consisting of measurements from two different wireless mesh network testbeds (802.11g and 802.11a).file: multi_channel_data_set.tar.gzdescription: We conduct measurement using two mesh network testbeds in two differentfrequency bands 802.11g in 2.4GHz band and 802.11a in 5GHz band.measurement purpose: Network Performance Analysismethodology: The measurements are from two different wireless mesh network testbeds (802.11g and 802.11a) set up in our departmental building as described below. All nodes in both the testbeds run Linux (kernel 2.6.22 in laptops and kernel 2.4.29 in the Soekris boxes) and the widely used madwifi device driver (version v0.9.4) for the 802.11 interfaces. We used standard linux tools such as iperf to send UDP packets on the sender node for each link measured and tcpdump on the receiver node running on a raw monitoring interface to capture the packets. This gives us the additional prism monitoring header information such as the received signal strength (RSS), noise, channel and data rate for every received packet. 1. 802.11g The 802.11g testbed uses 10 Dell latitude D510 laptops each with one Atheros chipset based D-link DWL AG660 PCMCIA 802.11a/b/g card with an internal antenna. The transmit powers are fixed to 15 dBm and data rate to 11 Mbps. Measurements from this testbed were collected on 40 different links on three orthogonal channels 1, 6, 11 (2412, 2437 and 2462 MHz respectively) in the 802.11g band. 2. 802.11a The 802.11a testbed consists of 13 nodes each of which is a Soekris net4801 single board computer (SBC). The PCI-slot in the SBC is expanded into 4 miniPCI slots using a PCI-to-miniPCI adapter. Four 802.11a/b/g miniPCI wireless cards based on Atheros chipset with external antennas are used in each mesh node. In order to overcome radio leakage problems, we physically separated the external antennas at a distance of about 0.5 meters based on measurements. Otherwise, there was a perceptible interference even among orthogonal channels across interfaces on the same node. Even with this setup, we could use only a subset of orthogonal channels without interference. These are 7 channels (channels 36, 44, 52, 60, 149, 157, 165) out of possible 13 orthogonal channels. The transmit powers are fixed to 15 dBm and data rate to 6 Mbps. Measurements from this testbed were collected on 78 different links in 13 orthogonal channels (between 5180-5825 Mhz) in the 802.11a band. Note that the 802.11a testbed is relatively free from external interference as there are no other networks operating in this band in the building. However, there are indeed several 802.11g networks in our building. Their influence is impossible to eliminate. We, however, did our experiments in this network during late night and early morning when other active 802.11g clients are unlikely. 3. interface For a given link between two multi-radio nodes, the choice of actual radio interfaces to use for this link could impact the link performance. To understand the variations caused by interface selection, we study 20 links (a subset of the 78 links studied before) in our 802.11a testbed using 16 possible interface pairs for each link. We select the same channel (channel 64, one of the good performing channels) for this measurement on all links in order to isolate the effect of interface selection.sunysb/multi_channel/link Traces802.11a: Traces of measurements from an 802.11a wireless mesh network testbed.configuration: This directory consist of measurements on 78 links each on 13 orthogonal channelsin 802.11a band. In total, there are 1014 files. format: DATAFORMAT of all files:All the data files are in csv format. The records in each file are of the following formatMAC_TIME_STAMP PACKET_TYPE CHANNEL SNR RSS NOISE DATA_RATE MAC_SEQUENCE_NUMBERS 802.11g: Traces of measurements from an 802.11g wireless mesh network testbed.configuration: This directory consist of measurements on 54 links each on 3 orthogonal channels in 802.11g band. In total, there are 162 files.format: DATAFORMAT of all files:All the data files are in csv format. The records in each file are of the following formatMAC_TIME_STAMP PACKET_TYPE CHANNEL SNR RSS NOISE DATA_RATE MAC_SEQUENCE_NUMBERS interface: Traces of measurements from 20 links of interface pairs between multi-radio nodes an 802.11a wireless mesh network testbed.configuration: This directory consist of measurements on 20 links working on channel 64 in the 802.11 band. For each link, measurements were done in 16 possible interface pairs. Note that our multi-radio node has 4 radios. So for any link there are 16 possible interface pairs. In total, there are 320 files.format: DATAFORMAT of all files:All the data files are in csv format. The records in each file are of the following formatMAC_TIME_STAMP PACKET_TYPE CHANNEL SNR RSS NOISE DATA_RATE MAC_SEQUENCE_NUMBERS

本数据集由两个不同无线网状网络测试平台（802.11g和802.11a）的测量数据组成。本研究采用两个不同频段的网状网络测试平台进行测量——802.11g频段位于2.4GHz，802.11a频段位于5GHz。测量起始日期为2008年4月26日，结束日期为2008年5月6日。收集环境为多通道多无线电架构，该架构在基于802.11的无线网状网络中已被广泛研究，旨在解决无线干扰导致的容量问题。所有研究均采用假设所有信道和无线电接口同质的信道分配算法。然而，在实际操作中，不同的信道会因相同链路的传播环境而表现出不同的链路质量。同一节点上的不同接口也会因硬件差异和所需的天线间隔而表现出链路质量的差异。为了研究这些差异，我们使用两个不同频段的网状网络测试平台进行了测量，包括2.4GHz频段的802.11g和5GHz频段的802.11a。网络配置：802.11a测试平台由13个节点组成，每个节点均为Soekris net4801单板计算机（SBC）。SBC中的PCI插槽通过PCI-to-miniPCI适配器扩展为4个miniPCI插槽。每个网状节点使用基于Atheros芯片组的4张802.11a/b/g miniPCI无线卡，并配备外部天线。发射功率固定为15 dBm，数据速率固定为6 Mbps。802.11g测试平台使用10台Dell latitude D510笔记本电脑，每台笔记本电脑配备一张基于Atheros芯片组的D-link DWL AG660 PCMCIA 802.11a/b/g卡，并配备内置天线。发射功率固定为15 dBm，数据速率固定为11 Mbps。数据收集方法：802.11g测试平台的测量数据收集于802.11g频段内三个正交信道（1、6、11，分别对应2412、2437和2462 MHz）的54个不同链路。802.11a测试平台的测量数据收集于802.11a频段内13个正交信道（5180-5825 MHz）的78个不同链路。我们使用标准的Linux工具，如iperf在发送节点上发送UDP数据包，并在运行于原始监控接口的接收节点上使用tcpdump捕获数据包。我们在2.4GHz频段的802.11g和5GHz频段的802.11a两个不同频段上使用两个网状网络测试平台进行测量。数据集：由两个不同无线网状网络测试平台（802.11g和802.11a）的测量数据组成的链路数据集。文件：multi_channel_data_set.tar.gz描述：本数据集采用两个不同频段的网状网络测试平台进行测量——802.11g频段位于2.4GHz，802.11a频段位于5GHz。测量目的：网络性能分析。方法：测量数据来自两个不同的无线网状网络测试平台（802.11g和802.11a），如以下所述设置在我们部门大楼内。两个测试平台中的所有节点均运行Linux操作系统（笔记本电脑上为2.6.22内核，Soekris盒子上为2.4.29内核）和广泛使用的madwifi设备驱动程序（版本v0.9.4）用于802.11接口。我们使用标准的Linux工具，如iperf在测量链路的发送节点上发送UDP数据包，并在运行于原始监控接口的接收节点上使用tcpdump捕获数据包。这为我们提供了额外的监控头信息，如每个接收数据包的接收信号强度（RSS）、噪声、信道和数据速率。1. 802.11g：802.11g测试平台使用10台Dell latitude D510笔记本电脑，每台笔记本电脑配备一张基于Atheros芯片组的D-link DWL AG660 PCMCIA 802.11a/b/g卡，并配备内置天线。发射功率固定为15 dBm，数据速率固定为11 Mbps。从该测试平台收集的测量数据涉及802.11g频段内三个正交信道（1、6、11，分别对应2412、2437和2462 MHz）的40个不同链路。2. 802.11a：802.11a测试平台由13个节点组成，每个节点均为Soekris net4801单板计算机（SBC）。SBC中的PCI插槽通过PCI-to-miniPCI适配器扩展为4个miniPCI插槽。每个网状节点使用基于Atheros芯片组的4张802.11a/b/g miniPCI无线卡，并配备外部天线。为了克服无线电泄漏问题，我们根据测量结果将外部天线物理分离，间隔约为0.5米。否则，即使在同一节点上的正交信道之间也会出现可感知的干扰。即使在这种设置下，我们也只能使用无干扰的正交信道子集。这些是13个可能正交信道中的7个信道（信道36、44、52、60、149、157、165）。发射功率固定为15 dBm，数据速率固定为6 Mbps。从该测试平台收集的测量数据涉及802.11a频段内13个正交信道（5180-5825 MHz）的78个不同链路。请注意，由于在建筑物内没有其他网络在该频段运行，802.11a测试平台相对不受外部干扰。然而，在我们的建筑物中确实存在几个802.11g网络。它们的影响无法完全消除。然而，我们在夜间和凌晨进行实验，当时其他活跃的802.11g客户端不太可能活跃。3. 接口：对于两个多无线电节点之间的给定链路，实际使用的无线电接口的选择可能会影响链路性能。为了了解接口选择引起的差异，我们使用802.11a测试平台中的20个链路（之前研究的78个链路的一个子集）和每个链路的16个可能接口对进行了研究。为了隔离接口选择的影响，我们在所有链路上选择了相同的信道（信道64，表现良好的信道之一）进行测量。接口：来自多无线电节点间接口对和802.11a无线网状网络测试平台的20个链路测量数据。配置：此目录包含在802.11频段内，每个正交信道（信道64）的78个链路上的测量数据。总共有1014个文件。格式：所有数据文件均为csv格式。每个文件中的记录格式如下：MAC时间戳、数据包类型、信道、信噪比、接收信号强度、噪声、数据速率、MAC序列号。802.11g：来自802.11g无线网状网络测试平台的测量数据跟踪。配置：此目录包含在802.11g频段内，每个正交信道（1、6、11，分别对应2412、2437和2462 MHz）的54个链路上的测量数据。总共有162个文件。格式：所有数据文件均为csv格式。每个文件中的记录格式如下：MAC时间戳、数据包类型、信道、信噪比、接收信号强度、噪声、数据速率、MAC序列号。接口：来自多无线电节点间接口对和802.11a无线网状网络测试平台的20个链路测量数据。配置：此目录包含在802.11频段内，每个链路（信道64）的20个可能接口对上的测量数据。由于我们的多无线电节点有4个无线电，因此对于任何链路，都有16个可能的接口对。总共有320个文件。格式：所有数据文件均为csv格式。每个文件中的记录格式如下：MAC时间戳、数据包类型、信道、信噪比、接收信号强度、噪声、数据速率、MAC序列号。