• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    A clustered routing protocol based on energy and link quality in WSNs①

    2017-03-28 09:49:21ShangXinna商新娜ChenZhiboSunGuodongLiJuhu
    High Technology Letters 2017年1期

    Shang Xinna (商新娜), Chen Zhibo, Sun Guodong, Li Juhu

    (*School of Information Science & Technology, Beijing Forestry University, Beijing 100083, P.R.China) (**College of Information Technology, Beijing Union University, Beijing 100101, P.R.China)

    A clustered routing protocol based on energy and link quality in WSNs①

    Shang Xinna (商新娜)***, Chen Zhibo②*, Sun Guodong*, Li Juhu*

    (*School of Information Science & Technology, Beijing Forestry University, Beijing 100083, P.R.China) (**College of Information Technology, Beijing Union University, Beijing 100101, P.R.China)

    Influenced by the environment and nodes status, the quality of link is not always stable in actual wireless sensor networks (WSNs). Poor links result in retransmissions and more energy consumption. So link quality is an important issue in the design of routing protocol which is not considered in most traditional clustered routing protocols. A based on energy and link quality’s routing protocol (EQRP) is proposed to optimize the clustering mechanism which takes into account energy balance and link quality factors. EQRP takes the advantage of high quality links to increase success rate of single communication and reduce the cost of communication. Simulation shows that, compared with traditional clustered protocol, EQRP can perform 40% better, in terms of life cycle of the whole network.

    clustered routing protocol, link quality, energy balance

    0 Introduction

    Wireless sensor networks (WSNs) have a wide variety of applications in recent years. Most of the WSNs are deployed outdoors for scientific investigation, environment monitor, military affairs and so on. The batteries of nodes are finite and are difficult to be charged in such conditions. So saving energy is important in WSNs. There are three parts of consuming energy of nodes: communication, data processing and monitoring. Communication is the largest part in consuming energy. In WSNs, influenced by the environment and nodes status, the quality of link between two nodes is not always stable . If a node can not transmit data packets to its next node, it has to retransmit the data packet again and more energy will be consumed in communication part. How to improve the success rate of single transmission and decrease the communication count is one of the key considerations in routing design. A clustered routing protocol EQRP is designed which considers the energy-aware and link-quality in optimizing the cluster heads in WSNs. EQRP takes the advantage of high quality link to increase the success rate of single communication and reduce the cost of communication.

    1 Related work

    There are two main types of routing protocols in WSNs: flat routing protocol and hierarchical routing protocol. Nodes are equal and have same function in flat routing protocol such as Flooding, Spin and DD protocol. These protocols are fit for the networks with small number nodes. LEACH,TEEN,APTEEN and HEED are typical hierarchical routing protocols which divide the nodes into cluster head nodes and common nodes. The common nodes transmit data packets to cluster head nodes which then integrate the data and transmit it to sink node. These protocols show good performance in large scale networks. Most of WSNs have large range and hierarchical routing protocols have more notice than flat protocol. Although some questions of network performance and data transmission are solved partly in hierarchical routing protocols, other issues such as energy imbalance, uneven distribution of cluster head and transmission instability still exist.

    Some improved optimization protocols are proposed in recent years. Ref.[1] puts forward a protocol named LEACH-ED. The main idea is to consider residual energy and distance between cluster-head nodes. But it does not limit the node count in clusters. Ref.[2] introduces LEACH-NOC which clusters the network and then chooses cluster head nodes within clusters by considering residual energy and position of nodes. LEACH-NOC optimizes the choosing of cluster head nodes within clusters, but the problem of the uniform distribution of the network is not solved. Routing protocol based on the ant colony algorithm is proposed in Ref.[3]. EETCA in Ref.[4] tried to avoid partial nodes evergy dissipation too fast. In Ref.[5], routing algorithm based on topology optimization control selects cluster head nodes by the weighted probability method to achieve energy balance between nodes. Link quality was considered in Refs[6,7]. A hierarchical routing protocol named L2PR in Ref.[6] considers the link quality into routing. In L2PR, nodes can forward data from multiple paths which can reach the robustness and balance of network. The drawback is that each node has to calculate and save the weight of different paths, since it can take a multi-forwarding mechanism as the source node.

    All these routing protocols are suitable for some WSNs. No routing protocol can be perfect and be applied to all applications. Most of proposed algorithms do not consider the quality of link between nodes which leads to retransmission and consumption of energy. In this work, the unreliable link quality and energy saving in clustered routing protocol are focused.

    2 Network model and assumption

    2.1 Network model and assumption

    Network with following characteristics is assumed.

    (1) the network has N sensor nodes and each node has distinctive identities from 1 to n.

    (2) All the nodes with limited energy do not move in network and have no position sensing capability.

    (3) Sink node has fixed location and infinite energy.

    (4) The network is sensitive to the incident and needs to ensure the success rate of the event monitoring.

    (5)The nodes can collect monitoring data periodically.

    The items from (1) to (3) are common characteristics of most WSNs. (5) indicates the special requirements in success rate of data forwarding.

    2.2 Energy consumption model

    In wireless sensor network, energy consumption is relatively small in addition to the energy consumed by the transmitting and receiving packets[8,9]. So most of the routing protocols only consider the energy consumption of the node transmitting packets (ETX) and receiving packets (ERX). When one node transmits k bit data to another node with distance d, ETXand ERXare calculated by

    (1)

    ERX(k)=ERX-elec(k)=kEelec

    (2)

    where d0is the threshold of distance. Eelecdenotes energy consumption in receiving and transmitting 1bit data. εfsand εmpdenote the power amplification factor in two energy consumptions modtively. EDAdenotes unit data fusion energy consumption. d0can be computed by

    The energy consumption of node i is

    E=ETX(k,d)+ERX(k)

    (3)

    2.3 Clustering mechanism in LEACH

    LEACH[10]protocol is a typical clustering routing protocol, for which common nodes send data packets to their cluster head nodes, and then the cluster head nodes forward it to the sink node. The basic idea of the algorithm is to select the cluster head nodes randomly in the rounds. The energy load of the whole network is assigned to each sensor node, so as to reduce the network energy consumption and improve overall survival time. Every node generates a random number between 0 and 1. If the random number is greater than threshold T(n), the node will be cluster head. T(n) is calculated by

    (4)

    where p denotes the percentage of the cluster head nodes in total number of nodes, r is the round number of reselecting the cluster head nodes, G denotes the node set which have not been cluster head in recent 1/p rounds. The probability of the nodes becoming cluster head is related to the number of nodes, the proportion of the cluster head and the number of rounds.

    The design of T(n) can ensure that each node can be a cluster head in a continuous 1/p round which leads to balancing the energy consumption. In the beginning of every round, the cluster head nodes broadcast message. Each common node may receive messages from many cluster head nodes. Then it chooses the nearest cluster head nodes and joins them into its cluster. This mechanism has the advantages of simple calculation, less interactive information and balanced energy consumption.

    3 EQRP design

    EQRP algorithm is the optimized enhanced algorithm based on the LEACH protocol. In LEACH, nodes become the cluster head randomly without consideration of their status. When a node with low energy and poor link quality becomes a cluster head, it will consume much energy and lead to faster death. EQRP algorithm takes into account the status of the nodes, depending on the integrated assessment of residual energy and link quality to optimize clustering of the nodes, balance the survival period of each node and greatly improve the life of the entire network.

    3.1 Computation of the link quality factor

    In actual wireless networks, nodes may not transmit data successfully at first time influenced by the environment and working status. Failure of the data transmission leads to retransmission which consumes more energy. If the nodes with stable link quality have more chance to be cluster head, more energy is saved by less retransmission[11,12].

    The communication work of cluster head nodes is divided into two parts. one is responsible for communicating with common nodes within the cluster. The better link quality the cluster-head has, the less energy the cluster consumes. The second part is communication with sink nodes. Because the cluster head is responsible for forwarding all the data packets from nodes within the cluster, the amount of data transmitted is far greater than that within the cluster. So the link quality between sink nodes and cluster head is much greater than the impact of the link between the cluster head and the nodes within cluster. In practical applications, it is needed to make a weight of the link quality of every node to sink node, and then calculate the average link quality.

    Let pijdenote the link quality between node i and node j and pij=pji. The expected transmission count(ETX) can be calculated as follows:

    ETXij=1/pij

    (5)

    The link quality factor can be calculated as follows:

    (6)

    where pnis the average link quality factor of node n, pniis the link quality between node n to alive node i, and pnsis link quality between node n and sink node. λ is the weight of link quality to sink node. The value of λ depends on the number of cluster members and the degree of data fusion. Without data fusion effects, cluster heads will forward all the data packets received from cluster members to sink node. λ can be determined as the average number of members in the clusters. By introducing the average link quality of node n as the weight factor, the probability of a good link quality node becomes larger and the probability of data transmission is reduced. The data transmission of the whole network is reduced and the energy of the whole network is saved.

    To illustrate pn, let us consider a scenario where 10 nodes are in a cluster with various link quality and λ=10 in Table 1.

    Table 1 Average link quality with 10 nodes and λ=10

    In this scenario, if the effect of other clustering factors is excluded and only the link quality is considered, node 9 whose average link quality is 0.91 should be the cluster head. Thus the expected transmission count ETX9=1/0.91=1.099. If node 6 with pn=0.80 becomes the cluster head, ETX4=1/0.80=1.25. Compared these two choices, percentage of energy savings is 13.7% ((1.25-1.099)/1.099×100%) .

    3.2 Residual energy factor

    In some improved clustering algorithms, the node residual energy is considered by using the ratio of residual energy and the initial energy of node as the weight to influence the clustering algorithm. But this weight will become smaller and smaller with the residual energy becomes less and less, which leads to the cluster threshold smaller[13,14]. After a certain time, total number of the cluster head nodes in whole network is not enough, because of too small threshold. In order to cope with this situation, improvement on the residual energy factor is made by adding a correction factor as

    (7)

    where Enis the residual energy factor, EnInitEnergyis the initial energy of node, EnLeftEnergyis the residual energy of node, rsdenotes the rounds in which node n is not continuously elected as cluster head. Once the node n is elected, rsis set to 0, p is the percentage of the cluster head in total number of nodes. The above equation illustrates that the more energy one node has, the more chance it can be cluster head by the ratio of residual energy and the initial energy.

    3.3 Comprehensive algorithm

    Based on the analysis of link quality factor and residual energy factor, the new clustering algorithm, EQRP is proposed which considers residual energy and link quality between nodes and their surrounding nodes. The improved clustering threshold formula is

    (8)

    where wnis the weight to reflect node n becomes cluster head. It is calculated by follows:

    wn=En×ω+pn(1-ω)

    (9)

    where ω is the the proportion of the remaining energy factor. Weight w is a constant value to balance the residual energy and link quality with life cycle and stability.

    4 Evaluation

    100 wireless sensor nodes are placed randomly in a 100m×100m area. All the parameters are set in Table 2.

    Table 2 Network parameters

    4.1 Network description

    To get accurate result, the same node distribution graph, the same sensor data sampling values and the same node link quality are used in every simulation for EQRP and LEACH. Once a cluster is established, it will keep stable for 10 hours. In this period, the node acquires data and sends data with an average interval of half an hour. The round number is noted in which the first node dies,10% nodes die, 50% nodes die and 90% nodes die. The remaining energy of the whole network and number of alive nodes after each round are noted too.

    4.2 Performance evaluation indicators

    (1) Network life cycle

    From the beginning of the network runtime to the death of first node, this stage is known as the stability of the network runtime. The longer the stability of the network runtime is, the better performance the routing protocol has. So the death of first node is used as an indicator. The time from the deployment of the network to the failure of the network function caused by N nodes death is defined as the network life cycle.

    The time of network function failure is related to the specific network. Generally the time of 10%, 50%, 90% death nodes are as the evaluation indicators.

    (2) Network energy consumption

    Network energy consumption is defined as the sum of the energy consumed by the network after a period of time. The energy consumption will be noted after every round to simplify comparison and be calculated as

    (10)

    where Ec(r) means the total energy consumption in r rounds. ECi(r) is the energy consumption of node i in r rounds.

    (3) Energy balance

    The energy consumption balance of the network is evaluated by energy variance which is calculated by the square of difference between the average value of the network energy and the single node’s energy. The smaller energy variance is, the better energy balance of the network is.

    The average value of the network energy is defined as follows:

    (11)

    where Eavg(r) is the average network energy after r rounds. Ei(r) is the residual energy of node i after r rounds.

    The energy variance is denoted as Esqr(r) and can be calculated as follows:

    (12)

    4.3 Simulation and discussion

    (1) Network life cycle

    Considering the retransmission by poor link quality, the comparison results of network life cycle are shown in Fig.1 and Fig.2.

    Because of the consideration of link quality, the energy consumption of the whole network is relatively large due to retransmission, resulting that the occurrence time of the first death node is greatly advanced. It can be seen from Fig.1, all nodes’ death time is greatly delayed, and the life cycle of the whole network

    Fig.1 Survival nodes number

    Fig.2 Number of death nodes

    is significantly improved. For example, the first death node occurs after 81 rounds in LEACH and 121 rounds in EQRP which has 40 rounds delay.

    (2) Network energy consumption

    Considering the link quality and comprehensive clustering algorithm, network energy consumption between LEACH and EQRP is shown as Fig.3.

    (a)

    (b) Fig.3 Comparison of energy consumption

    As can be seen in Fig.3(a), the slope of the EQRP protocol is significantly less than the slope of the LEACH protocol, which shows that the energy consumption in EQRP is far slower than the LEACH protocol. In Fig.3(b), after 100 rounds of the network, the total energy consumption of the LEACH protocol is 19.68J and EQRP protocol is 12.57J which is reduced by 57%. In the first 400 rounds, the total energy consumption can also be reduced by 15%.

    As the death nodes added, the number of survival nodes in LEACH protocol network is far less than the number in EQRP network. The advantage is that total energy consumption in EQRP protocol in the network is gradually reduced until the exhaustion of energy consumption of two networks.

    (3) Energy balance

    Considering the link quality and comprehensive clustering algorithm, network energy balance between LEACH and EQRP is shown in Fig.4.

    Fig.4 Comparison of energy variance

    In Fig.4, the horizontal coordinate indicates the network running time, the vertical axis means the energy variance value. As can be seen, the slope of the EQRP protocol is significantly less than that of the LEACH protocol, which indicates that the energy balance of the whole network is significantly better than that of the LEACH protocol.

    5 Conclusion

    This study introduces the clustering routing protocol EQPR which integrates link quality and residual energy factor as key metrics in clustering mechanism. The link quality factor makes the nodes with good link quality have more chances to be cluster head and the residual energy factor brings the energy balance of whole network. Simulations show that EQRP improves the life cycle and energy balance of the whole network. In the future, it is intended to extend this work into large scale WSNs and implement EQRP on real testbeds to evaluate its performance.

    [1] Gu X P, Sun Y J, Qian J S. An improved clustering routing protocol for wireless sensor networks.Micro Electronics & computer,2009,26(3):34-37

    [2] Zhang P, Xu Z F, Sun Y. New routing protocol on optimal number of clusters for wireless sensor network.Chinese Journal of Sensors and Actuators,2009,22(7):1013-1017

    [3] Li Q, Zhang B H, Cui L G, et al. Immunizations on small worlds of tree-based wireless sensor networks. Chinese Physics B, 2012,21(5):1-9

    [4] Jiang Y S, Li P, Ma C. An energy efficient topolopy control algorithm for wireless sensor networks.Transducer and Microsystem Technologics, 2014,33(2):146-149

    [5] Hoon O, Han T D. A demand-based slot assignment algorithm for energy-aware reliable data transmission in wireless sensor networks. Wireless Networks,2012,18(5):523- 534

    [6] Diallo C, Marot M, Becker M. Link quality and local load balancing routing mechanisms in Wireless Sensor Networks. In: Proceedings of the 6th Advanced International Conference on Telecommunications(AICT), Barcelona, Spain, 2010. 306-315

    [7] Dimitrios J, Vergados, George I Stassinopoulos. Adaptive duty cycle control for optimal stochastic energy harvesting. Wireless Personal Communications,2013,68(1):201-212

    [8] Li Q, Zhu Q X, Wang M W. Design of a distributed energy-efficient clustering algorithm for heterogeneous wireless sensor networks.Computer Communications, 2006,29(12):2230-2237

    [9] Wang F, Liu J C. On reliable broadcast in low duty-cycle wireless sensor networks. IEEE Transactions on Mobile Computing, 2012,11(5):767-779

    [10] Lindsey S, Raghavendra C,Krishna M. Data gathering algorithms in sensor networks using energy metrics. IEEE Transactions on Parallel and Distributed Systems,2011,13(9):924- 935

    [11] Mao Y C, Wang J L,Wang K, et al. Hierarchical routing protocol based on link quality in wireless sensor network. Computer Science,2015,42(3):74-80

    [12] Yuan Z W,Liang J J. Cumulative link quality routing algorithm research on WSN.Computer Engineering and Applications,2011,47(14):66-69

    [13] Feng J, Wu C C. Multi-hop clustering routing algorithm for WSN based on energy consumption balance.Computer Engineering.2012,39(16):104-107

    [14] Cao H Y, Yuan Y, Liu Z Q. Routing algorithm for WSNs based on residual energy of node and the maximum angle. Transducer and Microsystem Technologies, 2015,34(1):120-123

    Shang Xinna, born in 1978. She is working toward the Ph.D degree at Beijing Forestry University. She received her B.S. and M.S. degree from China University of Petroleum in 2004 and 2001. Her research interests include the wireless sensor networks, data analysis and processing.

    10.3772/j.issn.1006-6748.2017.01.012

    ①Supported by the National Natural Science Foundation of China (No. 61300180), Beijing Higher Education Young Elite Teacher Project (No. YETP1755), the Fundamental Research Funds for the Central Universities of China (No. TD2014-01), the Importation and Development of High-caliber Talents Project of Beijing Municipal Institutions (No. CIT&TCD201504039).

    ②To whom correspondence should be addressed. E-mail: zhibo@bjfu.edu.cn Received on Feb. 26, 2016

    高清在线国产一区| 丁香欧美五月| 9191精品国产免费久久| 天堂网av新在线| 精品一区二区三区av网在线观看| 国产av一区在线观看免费| 国产高潮美女av| 精品不卡国产一区二区三区| 内射极品少妇av片p| 最新美女视频免费是黄的| 黄色丝袜av网址大全| 怎么达到女性高潮| 欧美最黄视频在线播放免费| 波多野结衣巨乳人妻| 国内久久婷婷六月综合欲色啪| 日韩免费av在线播放| 国产伦一二天堂av在线观看| 亚洲无线观看免费| 一区二区三区国产精品乱码| 亚洲午夜理论影院| 日韩国内少妇激情av| 欧美+亚洲+日韩+国产| 国产黄a三级三级三级人| 美女cb高潮喷水在线观看| 欧美另类亚洲清纯唯美| 熟妇人妻久久中文字幕3abv| 亚洲中文字幕日韩| 伊人久久精品亚洲午夜| 99久久无色码亚洲精品果冻| 综合色av麻豆| 亚洲国产精品成人综合色| 青草久久国产| 亚洲成人久久爱视频| 蜜桃久久精品国产亚洲av| 亚洲午夜理论影院| 全区人妻精品视频| 波野结衣二区三区在线 | 在线国产一区二区在线| 韩国av一区二区三区四区| 性欧美人与动物交配| 天堂av国产一区二区熟女人妻| 国产激情偷乱视频一区二区| 精品福利观看| 88av欧美| 欧美日韩国产亚洲二区| 欧美午夜高清在线| 最新在线观看一区二区三区| av中文乱码字幕在线| 亚洲五月婷婷丁香| 男女午夜视频在线观看| 两人在一起打扑克的视频| 国产极品精品免费视频能看的| 极品教师在线免费播放| 中文在线观看免费www的网站| 此物有八面人人有两片| 欧美色欧美亚洲另类二区| 国产一级毛片七仙女欲春2| 波多野结衣高清作品| 亚洲人成电影免费在线| 美女被艹到高潮喷水动态| 色综合婷婷激情| 97碰自拍视频| 国产精华一区二区三区| 日韩国内少妇激情av| 男女床上黄色一级片免费看| 国产探花在线观看一区二区| 国产精品av视频在线免费观看| 91麻豆av在线| 国产不卡一卡二| 国内精品久久久久久久电影| 国产老妇女一区| 日韩欧美在线二视频| 一个人免费在线观看电影| 国产乱人视频| 18+在线观看网站| 丝袜美腿在线中文| 中文字幕熟女人妻在线| 91av网一区二区| 亚洲欧美日韩东京热| 久久久国产成人精品二区| 久久亚洲真实| 国产高清视频在线观看网站| 国产高清视频在线播放一区| 看免费av毛片| 少妇人妻精品综合一区二区 | 在线看三级毛片| 久久精品综合一区二区三区| 97碰自拍视频| 婷婷精品国产亚洲av| 免费人成在线观看视频色| 国产97色在线日韩免费| 99riav亚洲国产免费| 亚洲欧美日韩东京热| 97超级碰碰碰精品色视频在线观看| 欧美成人性av电影在线观看| 国产一区在线观看成人免费| 少妇熟女aⅴ在线视频| xxx96com| 欧美色欧美亚洲另类二区| 18禁美女被吸乳视频| av国产免费在线观看| 在线观看66精品国产| 国产欧美日韩精品一区二区| 美女 人体艺术 gogo| 日日干狠狠操夜夜爽| 国产精品久久久久久精品电影| 久久久久免费精品人妻一区二区| 蜜桃久久精品国产亚洲av| 嫁个100分男人电影在线观看| 国产国拍精品亚洲av在线观看 | 日韩人妻高清精品专区| 亚洲av中文字字幕乱码综合| 欧美黄色淫秽网站| 91久久精品国产一区二区成人 | 99热只有精品国产| 大型黄色视频在线免费观看| 9191精品国产免费久久| 人妻久久中文字幕网| 黄色女人牲交| 精品一区二区三区人妻视频| 又黄又粗又硬又大视频| 男女那种视频在线观看| 99在线视频只有这里精品首页| 午夜福利免费观看在线| 搡女人真爽免费视频火全软件 | 夜夜看夜夜爽夜夜摸| 日韩人妻高清精品专区| 亚洲精品一区av在线观看| 在线观看一区二区三区| 免费电影在线观看免费观看| 国产老妇女一区| 午夜精品在线福利| 久久久久性生活片| 久久香蕉精品热| 欧美极品一区二区三区四区| 国产美女午夜福利| 亚洲国产色片| 人妻久久中文字幕网| 国产激情欧美一区二区| 欧美日韩精品网址| 午夜福利高清视频| 香蕉av资源在线| 嫩草影院精品99| 国产亚洲精品久久久com| 国产欧美日韩一区二区精品| 特大巨黑吊av在线直播| 欧美大码av| 国产午夜精品论理片| 又黄又爽又免费观看的视频| 三级国产精品欧美在线观看| 少妇人妻一区二区三区视频| 亚洲激情在线av| 精品免费久久久久久久清纯| 亚洲欧美日韩高清专用| 亚洲人成电影免费在线| 首页视频小说图片口味搜索| 亚洲天堂国产精品一区在线| 国产亚洲精品综合一区在线观看| 亚洲av五月六月丁香网| 此物有八面人人有两片| 宅男免费午夜| 香蕉丝袜av| tocl精华| 最新在线观看一区二区三区| 免费观看精品视频网站| 精品久久久久久久人妻蜜臀av| 熟妇人妻久久中文字幕3abv| 一级黄色大片毛片| 波多野结衣高清无吗| 亚洲精品日韩av片在线观看 | 亚洲五月天丁香| 成人鲁丝片一二三区免费| 黄色丝袜av网址大全| 日韩欧美在线乱码| 又紧又爽又黄一区二区| 97碰自拍视频| 免费av毛片视频| 两个人视频免费观看高清| 1024手机看黄色片| 18禁美女被吸乳视频| 黄片大片在线免费观看| 免费看日本二区| 国产亚洲精品综合一区在线观看| 不卡一级毛片| 国内揄拍国产精品人妻在线| 99国产综合亚洲精品| 在线观看午夜福利视频| 亚洲人成电影免费在线| 久久人妻av系列| 内射极品少妇av片p| 精品国产亚洲在线| 国产不卡一卡二| 亚洲性夜色夜夜综合| a在线观看视频网站| 99热这里只有精品一区| 波多野结衣巨乳人妻| 成年版毛片免费区| 日韩欧美精品v在线| 国产三级黄色录像| 欧美性感艳星| 成年人黄色毛片网站| 国产成人欧美在线观看| 制服人妻中文乱码| 搡老熟女国产l中国老女人| 两个人的视频大全免费| 久久99热这里只有精品18| 国产一区二区三区在线臀色熟女| 最近视频中文字幕2019在线8| 美女cb高潮喷水在线观看| www.熟女人妻精品国产| 日韩大尺度精品在线看网址| 又紧又爽又黄一区二区| 亚洲成人精品中文字幕电影| 久久精品影院6| 十八禁人妻一区二区| 亚洲人成网站在线播| netflix在线观看网站| 国产精品亚洲一级av第二区| 一a级毛片在线观看| av天堂中文字幕网| 成人三级黄色视频| 超碰av人人做人人爽久久 | 国产精品久久久久久久久免 | xxxwww97欧美| 国产精品野战在线观看| 国产精品久久久久久久电影 | 精品99又大又爽又粗少妇毛片 | 欧美日韩中文字幕国产精品一区二区三区| 91久久精品国产一区二区成人 | 757午夜福利合集在线观看| 亚洲真实伦在线观看| 一二三四社区在线视频社区8| 亚洲aⅴ乱码一区二区在线播放| 国产精品久久久久久久久免 | av黄色大香蕉| 国产黄片美女视频| 一a级毛片在线观看| 超碰av人人做人人爽久久 | 国产成人欧美在线观看| 亚洲av中文字字幕乱码综合| 动漫黄色视频在线观看| 少妇丰满av| 亚洲,欧美精品.| 男女视频在线观看网站免费| 色综合欧美亚洲国产小说| 脱女人内裤的视频| 免费无遮挡裸体视频| 日韩欧美精品v在线| 嫩草影院精品99| 黄色片一级片一级黄色片| 观看免费一级毛片| 在线a可以看的网站| 草草在线视频免费看| 国内毛片毛片毛片毛片毛片| 国产中年淑女户外野战色| 国内精品久久久久精免费| 精品国产亚洲在线| 他把我摸到了高潮在线观看| 岛国在线免费视频观看| 日本黄色片子视频| 在线播放无遮挡| 两个人的视频大全免费| 黄片小视频在线播放| 精品欧美国产一区二区三| 国内久久婷婷六月综合欲色啪| 九九在线视频观看精品| 久久这里只有精品中国| 欧美日韩中文字幕国产精品一区二区三区| 一本久久中文字幕| av黄色大香蕉| 国产精品99久久久久久久久| 免费人成视频x8x8入口观看| 日韩高清综合在线| svipshipincom国产片| 亚洲色图av天堂| avwww免费| 亚洲精华国产精华精| 欧美国产日韩亚洲一区| av福利片在线观看| 3wmmmm亚洲av在线观看| 午夜亚洲福利在线播放| 首页视频小说图片口味搜索| 中文资源天堂在线| 久久精品91蜜桃| 欧美bdsm另类| 亚洲av熟女| 蜜桃久久精品国产亚洲av| 一个人看视频在线观看www免费 | 免费在线观看成人毛片| 在线观看免费午夜福利视频| 色综合亚洲欧美另类图片| 国产精品香港三级国产av潘金莲| 丰满乱子伦码专区| 欧美日韩一级在线毛片| 可以在线观看毛片的网站| 日韩精品青青久久久久久| 18禁在线播放成人免费| 三级毛片av免费| 久久久久久久久中文| 神马国产精品三级电影在线观看| 叶爱在线成人免费视频播放| 日本撒尿小便嘘嘘汇集6| 久久精品国产亚洲av涩爱 | 老司机福利观看| 一级毛片高清免费大全| 久久精品人妻少妇| 精品国产三级普通话版| 高清毛片免费观看视频网站| 亚洲av成人精品一区久久| 精品不卡国产一区二区三区| 少妇人妻一区二区三区视频| 深爱激情五月婷婷| xxxwww97欧美| 国产伦在线观看视频一区| 欧美日韩瑟瑟在线播放| 全区人妻精品视频| 国产一区在线观看成人免费| 精品乱码久久久久久99久播| 18禁美女被吸乳视频| 精品一区二区三区视频在线 | 亚洲 欧美 日韩 在线 免费| 婷婷精品国产亚洲av在线| eeuss影院久久| 欧美午夜高清在线| 天堂动漫精品| 国产精品日韩av在线免费观看| 超碰av人人做人人爽久久 | 久久天躁狠狠躁夜夜2o2o| 一级作爱视频免费观看| 国产精品嫩草影院av在线观看 | 欧美一区二区亚洲| 91久久精品国产一区二区成人 | 国产麻豆成人av免费视频| 亚洲成av人片免费观看| 九九热线精品视视频播放| 男人的好看免费观看在线视频| 久久久久精品国产欧美久久久| 亚洲精品在线美女| 五月伊人婷婷丁香| 超碰av人人做人人爽久久 | www.熟女人妻精品国产| 日韩国内少妇激情av| 黄色女人牲交| 免费观看的影片在线观看| 啦啦啦观看免费观看视频高清| 在线观看av片永久免费下载| 99热只有精品国产| 一级作爱视频免费观看| 9191精品国产免费久久| 久久精品夜夜夜夜夜久久蜜豆| 真人一进一出gif抽搐免费| 日日摸夜夜添夜夜添小说| 村上凉子中文字幕在线| 欧美激情在线99| 淫妇啪啪啪对白视频| 亚洲精品亚洲一区二区| 免费观看人在逋| 欧洲精品卡2卡3卡4卡5卡区| 一区二区三区激情视频| 中文字幕人妻丝袜一区二区| 亚洲人与动物交配视频| 无限看片的www在线观看| 99久久精品热视频| 精品欧美国产一区二区三| 亚洲国产欧美网| 国内揄拍国产精品人妻在线| 亚洲av免费高清在线观看| 好看av亚洲va欧美ⅴa在| 久久久久久久久大av| 在线观看日韩欧美| 欧美日韩国产亚洲二区| 国产一区在线观看成人免费| 国产亚洲精品久久久com| 午夜日韩欧美国产| 搡老岳熟女国产| 一本久久中文字幕| netflix在线观看网站| 国产一区二区在线观看日韩 | 高潮久久久久久久久久久不卡| 一区二区三区高清视频在线| 国内毛片毛片毛片毛片毛片| 一区福利在线观看| 成人特级av手机在线观看| 男插女下体视频免费在线播放| 窝窝影院91人妻| 婷婷六月久久综合丁香| 国产淫片久久久久久久久 | 桃色一区二区三区在线观看| 岛国在线观看网站| АⅤ资源中文在线天堂| 亚洲欧美精品综合久久99| 亚洲电影在线观看av| 亚洲av电影在线进入| 成熟少妇高潮喷水视频| 国产极品精品免费视频能看的| 欧美一区二区亚洲| 老师上课跳d突然被开到最大视频 久久午夜综合久久蜜桃 | 成年女人毛片免费观看观看9| 夜夜看夜夜爽夜夜摸| 在线观看美女被高潮喷水网站 | 色综合站精品国产| 欧美色视频一区免费| 九色国产91popny在线| 神马国产精品三级电影在线观看| 国产黄色小视频在线观看| 高清在线国产一区| 久久久久亚洲av毛片大全| 午夜老司机福利剧场| 少妇的逼水好多| 免费av毛片视频| 欧美黄色淫秽网站| 亚洲成人免费电影在线观看| 叶爱在线成人免费视频播放| 久久国产精品人妻蜜桃| 美女大奶头视频| 精品欧美国产一区二区三| 757午夜福利合集在线观看| 天堂√8在线中文| 亚洲人成网站在线播| 久久精品人妻少妇| 最近最新免费中文字幕在线| 亚洲国产日韩欧美精品在线观看 | 亚洲久久久久久中文字幕| 大型黄色视频在线免费观看| 午夜福利在线观看吧| 亚洲一区二区三区不卡视频| www.色视频.com| 精品无人区乱码1区二区| 午夜两性在线视频| 观看美女的网站| 啦啦啦韩国在线观看视频| 国产伦精品一区二区三区视频9 | 欧美最黄视频在线播放免费| 亚洲精品成人久久久久久| 青草久久国产| 亚洲国产精品合色在线| 九九热线精品视视频播放| 久久人妻av系列| 久久国产乱子伦精品免费另类| 精品一区二区三区视频在线 | 啪啪无遮挡十八禁网站| 国产亚洲精品综合一区在线观看| 国产高清视频在线观看网站| 亚洲欧美日韩卡通动漫| 国产色婷婷99| 国产精品香港三级国产av潘金莲| 热99re8久久精品国产| 变态另类成人亚洲欧美熟女| 天美传媒精品一区二区| 国产av麻豆久久久久久久| 色综合亚洲欧美另类图片| 成年女人毛片免费观看观看9| 国产精品综合久久久久久久免费| 色精品久久人妻99蜜桃| 特级一级黄色大片| 丰满乱子伦码专区| 人妻丰满熟妇av一区二区三区| 无遮挡黄片免费观看| 在线观看日韩欧美| 精品不卡国产一区二区三区| а√天堂www在线а√下载| 精品久久久久久久人妻蜜臀av| 午夜免费观看网址| 欧美日韩亚洲国产一区二区在线观看| 国产精品影院久久| 亚洲国产色片| 女同久久另类99精品国产91| 18禁美女被吸乳视频| 久久久久久久久中文| 亚洲18禁久久av| 国产精品久久久久久久久免 | 亚洲欧美日韩东京热| 中文字幕熟女人妻在线| 欧美一级a爱片免费观看看| 国产精品av视频在线免费观看| 狂野欧美白嫩少妇大欣赏| 亚洲中文字幕日韩| 女人十人毛片免费观看3o分钟| 亚洲国产日韩欧美精品在线观看 | 脱女人内裤的视频| 高清日韩中文字幕在线| 精品久久久久久成人av| 男人舔奶头视频| 亚洲欧美日韩高清专用| 亚洲成人免费电影在线观看| 免费人成视频x8x8入口观看| 国产成+人综合+亚洲专区| 欧美性猛交黑人性爽| 天堂网av新在线| 国产精品,欧美在线| 国产精品久久电影中文字幕| 亚洲乱码一区二区免费版| 少妇人妻精品综合一区二区 | 男人和女人高潮做爰伦理| 老司机在亚洲福利影院| 亚洲av一区综合| 国产色婷婷99| 久久欧美精品欧美久久欧美| 男女之事视频高清在线观看| 国产av一区在线观看免费| 999久久久精品免费观看国产| 久久久国产精品麻豆| 亚洲第一欧美日韩一区二区三区| 国语自产精品视频在线第100页| 欧美黄色片欧美黄色片| 中文字幕精品亚洲无线码一区| 757午夜福利合集在线观看| 香蕉av资源在线| 国产麻豆成人av免费视频| 日韩精品中文字幕看吧| 亚洲av美国av| 中文字幕精品亚洲无线码一区| 午夜精品久久久久久毛片777| 韩国av一区二区三区四区| 18禁黄网站禁片免费观看直播| 色精品久久人妻99蜜桃| 午夜视频国产福利| 日本 av在线| 在线观看免费午夜福利视频| 内射极品少妇av片p| 亚洲,欧美精品.| 国产亚洲欧美98| 精品国产超薄肉色丝袜足j| 国内毛片毛片毛片毛片毛片| 国内久久婷婷六月综合欲色啪| 国产真人三级小视频在线观看| 99久久精品国产亚洲精品| 亚洲 国产 在线| 美女 人体艺术 gogo| 国产三级中文精品| 日韩亚洲欧美综合| 女同久久另类99精品国产91| 国模一区二区三区四区视频| 亚洲精品一卡2卡三卡4卡5卡| 久久亚洲真实| 免费av不卡在线播放| 欧美激情在线99| 精品福利观看| 成人无遮挡网站| 在线观看舔阴道视频| 久久精品影院6| 啦啦啦观看免费观看视频高清| 国产av不卡久久| 99久久精品一区二区三区| 午夜福利免费观看在线| 天堂av国产一区二区熟女人妻| 国产三级黄色录像| 怎么达到女性高潮| 国产一区二区在线av高清观看| 国产精品野战在线观看| 亚洲国产欧美人成| 99久久精品一区二区三区| 美女高潮喷水抽搐中文字幕| 真实男女啪啪啪动态图| 亚洲精品美女久久久久99蜜臀| 脱女人内裤的视频| 淫秽高清视频在线观看| 人人妻人人看人人澡| 最近视频中文字幕2019在线8| 亚洲无线观看免费| 超碰av人人做人人爽久久 | 精品人妻偷拍中文字幕| 99在线视频只有这里精品首页| 日本免费一区二区三区高清不卡| 99在线视频只有这里精品首页| 成人av一区二区三区在线看| 国产淫片久久久久久久久 | 在线十欧美十亚洲十日本专区| 亚洲欧美日韩卡通动漫| 亚洲av二区三区四区| www.www免费av| 午夜两性在线视频| 男人和女人高潮做爰伦理| 亚洲精品在线美女| 一级作爱视频免费观看| 日韩欧美国产一区二区入口| 色视频www国产| 久久这里只有精品中国| 欧美日韩亚洲国产一区二区在线观看| 99久久精品热视频| 午夜精品一区二区三区免费看| 天堂动漫精品| 午夜视频国产福利| 日本免费a在线| 国产精品99久久99久久久不卡| 一区二区三区免费毛片| 一区二区三区激情视频| 亚洲人成电影免费在线| 亚洲美女黄片视频| 精品久久久久久成人av| 黄片小视频在线播放| 国内精品久久久久精免费| 九九热线精品视视频播放| 欧美乱色亚洲激情| 欧美在线一区亚洲| 一区二区三区激情视频| 欧美色视频一区免费| 亚洲 国产 在线| 国产69精品久久久久777片| 男女下面进入的视频免费午夜| 亚洲不卡免费看| 日本精品一区二区三区蜜桃| 真人做人爱边吃奶动态| 舔av片在线| 国产毛片a区久久久久| 一区二区三区免费毛片| 国产免费一级a男人的天堂| xxxwww97欧美| 最新中文字幕久久久久| 欧美中文综合在线视频| 一级a爱片免费观看的视频| 国内精品久久久久久久电影| 日本免费一区二区三区高清不卡| 国产精华一区二区三区| 欧美+日韩+精品|