• <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 ?

    5G Smart Mobility Management Based Fuzzy Logic Controller Unit

    2022-08-23 02:17:46ChafaaHamrouniandSlimChaoui
    Computers Materials&Continua 2022年6期

    Chafaa Hamrouniand Slim Chaoui

    1Taif University-Khurma Univ.College-Department of Computer Sciences,Khurma,2935,Kingdom of Saudi Arabia

    2College of Computer and Information Sciences,Dep.of Computer Engineering and Networks,Jouf University,Skaka,K.S.A

    Abstract: In the paper, we propose a fuzzy logic controller system to be implemented for smart mobility management in the 5G wireless communication network.Mobility management is considered as a main issue for all-IP mobile networks future generation.As a network-based mobility management protocol, Internet Engineering Task Force developed the Proxy Mobile IPv6 (PMIPv6) in order to support the mobility of IP devices, and many other results were presented to reduce latency handover and the amount of PMIPv6 signaling, but it is not enough for the application needs in realtime.The present paper describes an approach based on the IEEE 802.21 Media Independent Handover(MIH)standard and PMIPv6,so we present a new vertical handover algorithm for anticipating handover process efficiently.Our object is to propose a smart mobility management that contribute in 5G wireless communication system network operating functions.Two proposed dynamic thresholds were successfully made to guaranty process triggering,and a new primitive MIH is proposed for signaling a needed handover to be done.Simulation results demonstrate a significant reduction of the handover delay, packet loss, handover blocking probability and signaling overhead.Simulation results and tests are accomplished.

    Keywords: 5G; proxy mobile IPv6; media independent handover; wireless system;QoS;LTE;HDM

    1 Introduction

    In a vertical handover situation,users are able to pass through several nodes based on different implemented algorithms and technologies [1–3] that affect communication quality of service (QoS).When a mobile node belongs to two different technologies [4,5] is obliged to pass through one cell to another, the mentioned phenomena emerges, and that’s maintain a continuous and seamless communication.Several solutions were proposed for handover process [6,7].However, we observe experimentally,packet loss and handover latency[8,9]are still very important and reduce the quality of service(QoS).In this context,we propose a solution for the 5G WiFi/LTE-A heterogeneous network mobility issues.This proposed new idea takes place during final step of the registration process in the handover procedure.It is based on the network mobility protocol, that means the proxy mobile(IPv6).We process the mobility protocol optimization [10,11], and since its operating time delay is less than the host-based mobility protocols delay(MIPv4 or MIPv6),that we call PMIPv6[12,13],it presents several advantages able for minimizing the signaling overhead,reducing several requirements of MN’s configuration,decreasing the movement detection time and improving the location privacy.In term of HL minimizing and compared to Mobile IPv6 [14].Experimentally, the PMIPv6 is not able to minimize better the HL, it needs much more from PL, signaling overhead, powerless and authentication procedure is not yet accomplished.For an overall efficiency maximization,the IEEE 802.21 Media Independent Handover standard[15,16]is introduced.In this context,we constate that the mobility management is considered an important issue for the IP mobile networks,by the mobility management protocol for networks,several research works presented as presented,contribute in the Proxy Mobile IPv6 (PMIPv6) development to support IP devices mobility and or to reduce latency handover and the amount of PMIPv6 signaling.Our object is to mask dissimilarities basic technology for the upper layer, that validates united services operations.In order to ensure a good selection of suitable network to hand off depending on MIH use.In that case,the MN must query all surrounding networks, thus presenting a critical phase.IEEE 802.21 standard [17] is introduced to collect the maximum of information available in wireless networks,as well as to ensure the corresponding MIH layer integrated in PHY/MAC level.

    2 Proposed Approach

    The proposed new solution consists of handover mechanisms use,this phenomena is depending on MIH/PMIPv6.Our objective is vertical handover optimization mechanism [18] process.We contribute to add a pre-handover process, including a specific phases such time consuming for execution after actual handover decision explained by pre resources checking, pre_IP assignment,pre_Gauthentication and pre reservation.These mentioned steps are executed before handover decision is done.To predict the link quality degradation in advance, two thresholds are defined, as well as anticipating the phase preparation.In order to validate that an imminent handover decision is validate,an MIH primitive message is defined.

    2.1 Proposed Protocol Stack

    For HL minimization,with the 5 G WiFI and LTE-A,we introduce a tightly coupled architecture.E-UTRAN component trough LTE–Uu interface, a connection of UE is made to eNode B, and this whitout any interface.The main role of EUTRAN is to validate connection of UE and the core network.Serving gateway through S1–U interface is made by evolved packet.Interworking with untrusted non-3GPP IP access systems are provided by data gateway.For interworking compatibility within the 3GPP networks,the LTE-A rests on framework engineering development.

    The LTE-A networks offload solution is guaranteed by widely deployed WiFi access point.WLAN interworking support is provided by LTE-A specifications[19],it includes seamless and nonseamless mobility, at core network level [20].The Fig.1 presents an arrangement in heterogeneous access networks, to ameliorete network-based localised mobility management: a new entity module named Handover Decision Maker is proposed in the protocol stack third layer[21].Both the eNodeB and the UE is presented by HDM.By empowering the connection layer with a knowledge, the IEEE 802.21 MIH standard offers a consistent handover which is moved to a higher layers.It controls occasions and messages traded between the HDM and the diverse access technologies.All of media independent command services, media independent event services and media independent information services[22],are supported by media independent command services.Introducing MIH services enables effective events triggering and reduces in second layer the scanning delay, and accelerates the handover process.In the eNB, the HDM is responsible handover decision making according depending in criterion such the RSSI and the signal-to interference-plus-noise ratio.It collects in handover measurement collector to store them in measurement database.In order to collect different information, the HDM situated on the UE gives orders to both the HMC and the MIHF.For any information collection step, the HDM placed on UE orders the MIHF and the HMC.All network information such security policies,RSS,traffic load,the bandwidth,are gathered by MIHF.User preferences information and terminal-related are gathered by HMC,such as the consumption of power,velocity,quality of services as costs of services.As for information,both HMC and the MIHF are emitted to upper layers by MIH-service APs.

    Figure 1:Proposed protocol stack

    2.2 Newly Defined Thresholds

    The Pre-associate going down the limit P-LGD_Thr shows that the connection quality is going down, it isn’t calamitous yet, it is before long going to be break.This criticism (message) request starting the handover cycle forecast.We proposed to trigger a foreseen message demonstrating a handover earlier need to genuine connection corruption, and consequently to keep an enhanced quality of services QoS.Just the connection down message is emitted once the MN is appended to another PoA,to give enough quality of services QoS called delicate handover or make-before-break handover.The Link down limit is set to demonstrate an awful sign quality.That implies that the MN is disconnected from serving access organization.The trigger P-LGD_Thr is used to indicate that link is going to be broken,for the trigger LD_Thr is utilized to validate that connection is instantly broken with:

    We propose two dynamic thresholds: firstly, LD_Thr which is calculated dropped call rate use,with the condition dropped call rate increases results the LD_Thr increases.Secondly P-LGD_Thr is a current cell RSS composite function,the candidate cells RSS and interferences levels.Mobile Node calculates the value of P-LGD_Thr that relying upon the neighbor cells signal quality.Since the Mobile Node is encircled by low quality cells, that outcomes P-LGD_Thr esteem decline and the handover chosen decision is postponed.In such circumstance,when a few decent quality cells is encompassing a versatile,the handover chosen decision will be sooner than the typical handover decision cycle.This handover type is utilized specifically cases, to diminish the one cell charge over in the over-burden organization, and this can be worked to change to another phone having a higher transfer speed or a superior QoS.The Hen signal strength is introduced under the characterized P-LGD_Thr edge,Mobile Node have a Pre_HO warning to start the cycle of handover forecast.Since a notice is gotten,the Mobile Node has sufficient opportunity to set up the handover cycle.

    We compute the P-LGD_Thr threshold as a composite function.These composition elements are presented in Fig.2, green curves for neighbouring cells RSS; red curve is for current cell RSS;and interferences levels as depicted.We determine P-LGD.Thr threshold as a link down prediction message.We take all measurements perio-dically.Using measurements values reports, we conclude that Mobile Node is able to detect signal quality which decrease over time.Other neighbor cells’quality signal increasing continuously on real timr.We observe current cell RSS is presented below the P-LGD_Thr threshold periodically.That results MIH_Link_Going_Down to transfert in order to indicate an unavoidable connection lost will take place.At this time the Mobile Node will look for a candidate cell matching three criteria:

    Figure 2:Defined thresholds

    ˙If network exists on adjoining networks list,in case of Mobile Node checks,MIIS worker just sent.Mobile Node sends the Pre_HO_Initiation message to nMAG to trigger the pre-assets accessibility checking, the pre-assets reservation measures, the pre-verification and the pre-IP task stages.The Mobile Node gets the P-LGD_Thr edge and the MIH_Link_Going_Down sign,as of now it quires from the MIIS worker,all encompassing organizations data by utilizing MIH_Get Information.On the off chance that current cell RSS is underneath LD_Thr edge,current connection will be broken.The handover decision is immediately validated when we select candidate cell,resulting new connection establishment.So candidate cell will be active and the registration and resources release steps,following the handover decision step, are executed.Three different states are presented: neighbor cell existing with a same mobility domain, many cells are surrounding cells to the close vicinity cell.Second candidate cell is a cell to which the Mobile Node handoff.For our proposed approach,we predicted disconnection from the serving network: the handover, PLGD_Thr trigger is invoked prior to an actual link down event(LD_Thr)by at least the time required.We conclude that a handover process is performed in terms of PL, HD and communication cost.Normally, a Mobile Node don’t begin constructing new new connection with any surrounding networks until until its connection link is lost,so once L2 is broken, right now Mobile Node start searching for the best network to handoff and inquiry information.

    Next morning, when the King sent for his twelve huntsmen, and they passed through the ante-room which was plentifully6 strewn with peas, they trod so firmly and walked with such a steady, strong step that not a single pea rolled away or even so much as stirred

    2.3 Newly Defined MIH

    For more efficiency,we propose a Pre_HO Initiation message that represents a new MIH primitive.To indicate the handover procedure need,a message is transmitted from Mobile Node to nMAG.If under a predefined threshold value,we observe the RSS and SINR values are decreasing instantly,a handover procedure must be triggered.We proposed a technique depending(Fig.3)on unique edges which shift due to introducing encompassing organizations.Since it is required,a handover setting off system encourages the Mobile Node to begin handover measure.Absolute handover disappointments number lessen and limit bogus handover number,which are guaranteed by the setting off system edge.

    Figure 3:Dynamic thresholds method

    Mobile Node checks if current network exists on nearby network list sent by MIIS worker a Pre_HO_Initiation message is moved to nMAG by the Mobile Node, the objectif is to trigger the pre_resources accessibility checking the pre_resources and pre_authentication reservation processes.MIH_Link Going_Down gets sign,so MN quires for encompassing organizations data from MIIS worker,and this by the assistance of the MIH.

    In the Fig.4 is described the Pre_HO Initiation message which is composed of MIH header,and for the latter is presented the operation code, service identifier, as well as the action identifier.The service identifier determines each MIH services gathered with its corresponding values:command service (1), service management (2), information service (3) and event service (4).In our approach, the service identifier is a service management or an information service.OpCode characterize the service identifier that executes an operation cc.

    Figure 4:Pre_HO_initiation message structure

    3 Key Performance Indicators(KPI)

    The accompanying two measurements are utilized to evaluate the impact progressions of the key boundary blends have what’s more,qualify the HO execution:

    -Handover failure rate: The handover failure rate (RateHOF) is the ratio of the failed handover number(Numfail)to the number of handover attempts.

    -Handover ping-pong rate: A handover is viewed as a ping-pong handover if a get back to is given and forward between two base stations in not exactly a crucial time(Tcrit=1 s).The ping-pong handover rate(RateHPP)is determined by:

    -The improvement targets:The goals of handover improvement are three folds:

    · To accomplish a HO disappointment rate that is under an objective esteem(Ratefail_limit=2%).

    · To limit the quantity of handovers(NumHO)while accomplishing target 1 and 2

    -The Fitting Function of HO Failure Rate:From the early studies of relation between KPI RateHOFand KPP,we conjectured that RateHOFcan be roughlyconstructed as quadratic function of offset with an impact factor of TTT.The polynomial of RateHOFcan be described as:

    where x,y denote offset and TTT value respectively,and pk is the undetermined coefficient.C.Fitting Function of HO Ping-pong Rate As RateHPPis highly sensitive to KPP in a certain range,and a slight change of KPP will cause a dramatic fluctuation of RateHPPwith an exponential trend,we constructed the function of RateHPPby:

    where x,y denotes offset and TTT value respectively.

    3.1 Selected Key Performance Indicators(KPI)

    It practices, type-2 fuzzy logic was initially introduced by Zadeh [23].The presented technique has been proved to be very interesting especially in complex problems which are treating real world noisy applications[24].We know that in during system development steps,Type-2 Fuzzy Logic(T2FL)defines the same lexicon of the classical type-1 FL as membership functions,rules,tnorms operations,fuzzification, inference and defuzzification, but those terms have unlike definitions to picture them.The big differentiations between Type-1 and Type-2 FL consists essentially in kind of fuzzy sets and in the output processor step which precede the defuzzification bloc; the type-1 MFs are certain and crisp,whereas these type-2 are themselves fuzzy;they are represented by a bounded region limited by two MFs,where corresponding to each primary MF(which is in[0,1]),a secondary MF is used to the primary one.

    Regarding the output processor,in type 1 FLSs it is represented just by the known defuzzification process(center of sets...),however,the in type-2 FLSs it consists of two components:Type reduction and defuzzification;type reduction makes a reduction from a type-2 fuzzy output sets to type-1 sets and then these reduced sets will be defuzzified to obtain the final crisp outputs.Fig.5 illustrates the global architecture of a type-2 fuzzy logic system.Mendel and John proposed the Interval Type-2,(IT2) FLS.In fact, IT2 fuzzy sets have membership grades that are crisp interval sets bounded in[0, 1].The uncertainty in the primary MF consists of the reunion of all MFs.This uncertainty represents a bounded region that it is called the Footprint of Uncertainty(FOU).

    Figure 5:Architecture of fuzzy logic system type 2

    4 Simulations Results and Discussions

    Our simulation tool is based on MATLAB R2015a environment,we evaluate the proposed vertical handover approach.Topology network consists of IEEE 802.11n wireless local area network,3GPP LTE-Advanced and MIH protocol network information server entity.In case of LTE-A network,our simulation node for the presenting Mobile Node is 1000×1000 m,the motion is in accordance with the mobility model random walk point.Mobile Node propagation model assumes simulation model cost is 231 indoor office model.Its velocity varies from 10 to 50 m/s.The main system parameters are described in Tab.1.

    The proposed approach performance evaluation is based on MIH compared to existing approach,a study and analysis of PMIPv6 standard procedure with PL and HLHL.

    Table 1: Simulation parameters values

    HL represents the period of time beginning from Mobile Node disconnected from old AP when the new AP transmit the first packet to the Mobile Node.We consider the PL as the average of drops packet number,and beginning from old AP to the new one,the handover procedure takes place and its value can be determined.The total handovers numbers performed in the corresponding networks;in addition the probability of blocking Handover(VHO)determines the blocked handovers rate.In the Fig.6 is presented HD comparison between the two approaches,that means existing approach and the proposed one.We can find out a variation of the MN’s velocity in interval of 10 to 50 m/s,in case of PMIPv6 standard.VHO performance is improved in terms of PMIPv6 standard as well as delays,and these element using our proposed approach,justified by some omitted delays.Surrounding networks information can be collect from mobile node before scanning operation,and the delay from channel scanning is eliminated as well as the re-association delay.MIH services minimizes scanning time,when candidate networks physical information from the MIIS server.Prior network target authenticates step to handover decision resulting omitting authentication delay.Proposed HL solution reduces the RA delay,the registration delay as well as the re-association delay complexity.

    Figure 6:Handover latency verion MN

    The Fig.7 presents the PL rate as the speed of an operating mobile node.The lost packets rate of increases with the mobiles nodes speed.Under our developed approach.If we compare standard and existing approach,our approach presents the lowest rate.

    Figure 7:Packet loss version MN speed

    We demonstrate in Fig.8 that streaming video service blocking probability of the handover,in the case of PMIPv6 procedure with MIH,as well as our proposed solution,are clearly determined.Since the arrival call rate VHO increase,we conclude that probability blocking VHO for streaming service video increase also,we confirm experimentally that our approach is approved.

    Figure 8:Probability blocking VHO vs.arrival rate call VHO

    In this research work, the use of Fuzzy Logic Controller is validated.By a control of Etching Printed Antenna based on FLT2, the system operates with more precision which affect the quality of service of the wireless transmission system.The proposed system is mainly optimized for robots,in addition it ensures telecommunication constraints and facilitates data exchange.We obtained (as Figs.9 and 10)outputs representing the surface with respect to inputs.These figures map the outputs decisions system.

    Figure 9:The surface viewers of each decision output variable SX

    Figure 10:The surface viewers of each decision output variable SY

    5 Conclusion

    Most of traditioned research works have three main objectives firstly to propose a portability plot appropriate for all versatile hubs in CCN,the two distributers and supporters;secondly to depict the progressive versatility the executives technique during intra-area and between space handoff;and finally to set up a diagnostic model and detail the area update flagging expense.content-centric networking has arisen as a promising worldview in current internet due to the interest-driven, we concern more about the substance itself instead of the spot it found, and thusly, content-centric networking underpins endorser portability locally, notwithstanding, it stays a significant test in distributer versatility.But in our research work demonstrates how to solve mobility issues for 5G WiFi and LTE-A access technologies.It is known that these networks are considered as a high mobility domain, and we are face to several criteria, such handover failure probability, latency and network scale.All these elements should be taken with a higher attention.The propose method is based on IEEE 802.21 MIH standard and PMIPv6.In case where handover is mentioned to established immediately needed to be done very soon,we proposed a MIH primitive to be added.The two dynamic thresholds are considered as basic process trigger.Where for the 5G heterogeneous networks,we will also combine and test DMM approaches and MIH framework, in this research work, we validate experimentally based on simulation results and analytic evaluation that the handover blocking probability and PL are minimized,as well as the signaling overhead and the HD.

    Acknowledgement:The Author would like to acknowledge the Dean of the Khurma University College and the Taif University Department of Scientific Research in the Kingdom of Saudi Arabiya, for motivation to accomplish the research work.

    Funding Statement:The authors declare no specific funding received for this work.

    Conflicts of Interest:The authors declare that they have no conflicts of interest to report regarding the present research work.

    少妇的逼好多水| √禁漫天堂资源中文www| 亚洲美女视频黄频| 搡女人真爽免费视频火全软件| 日韩精品有码人妻一区| 国产精品秋霞免费鲁丝片| 又大又黄又爽视频免费| 国产午夜精品久久久久久一区二区三区| 亚洲av男天堂| 色婷婷av一区二区三区视频| 久久99蜜桃精品久久| 男人操女人黄网站| 菩萨蛮人人尽说江南好唐韦庄| 26uuu在线亚洲综合色| 2022亚洲国产成人精品| 日本av免费视频播放| 精品午夜福利在线看| 国产成人精品婷婷| 国产欧美另类精品又又久久亚洲欧美| 色婷婷av一区二区三区视频| 桃花免费在线播放| 黄片播放在线免费| 嫩草影院入口| 亚洲国产最新在线播放| 亚洲国产最新在线播放| 免费日韩欧美在线观看| 国产亚洲精品久久久com| 水蜜桃什么品种好| 日韩一区二区三区影片| 成人无遮挡网站| 王馨瑶露胸无遮挡在线观看| 中文字幕精品免费在线观看视频 | 99九九线精品视频在线观看视频| 美女内射精品一级片tv| 亚洲高清免费不卡视频| 亚洲精品日本国产第一区| 亚洲精品第二区| 亚洲精品国产av蜜桃| 国产成人精品一,二区| 中文字幕制服av| 内地一区二区视频在线| 久久精品国产鲁丝片午夜精品| 日日啪夜夜爽| 午夜影院在线不卡| 国产淫语在线视频| 大香蕉久久网| 国产精品一区二区三区四区免费观看| 欧美最新免费一区二区三区| 国产女主播在线喷水免费视频网站| 两个人的视频大全免费| 日韩av在线免费看完整版不卡| 日韩一本色道免费dvd| 免费观看av网站的网址| 欧美xxⅹ黑人| 国产永久视频网站| 亚洲美女黄色视频免费看| 黑人巨大精品欧美一区二区蜜桃 | 国产欧美日韩一区二区三区在线 | 精品一区二区免费观看| 春色校园在线视频观看| 在线观看一区二区三区激情| 欧美日韩一区二区视频在线观看视频在线| 精品一区二区免费观看| 美女国产高潮福利片在线看| 国产av一区二区精品久久| 91午夜精品亚洲一区二区三区| 有码 亚洲区| 51国产日韩欧美| 久久毛片免费看一区二区三区| 亚洲精品亚洲一区二区| a级毛片免费高清观看在线播放| 亚洲五月色婷婷综合| 在线播放无遮挡| av在线观看视频网站免费| 制服人妻中文乱码| 亚洲人成网站在线播| 看十八女毛片水多多多| 精品午夜福利在线看| av女优亚洲男人天堂| 欧美一级a爱片免费观看看| 久久99一区二区三区| 一边亲一边摸免费视频| 超碰97精品在线观看| 91精品三级在线观看| 最黄视频免费看| 男男h啪啪无遮挡| 国产深夜福利视频在线观看| 日本黄大片高清| 777米奇影视久久| 免费日韩欧美在线观看| 国产毛片在线视频| 国产精品秋霞免费鲁丝片| 一区二区三区乱码不卡18| 午夜福利视频在线观看免费| 两个人的视频大全免费| 天美传媒精品一区二区| 欧美精品高潮呻吟av久久| 满18在线观看网站| 人人妻人人添人人爽欧美一区卜| 精品亚洲成国产av| 亚洲av国产av综合av卡| 18禁在线无遮挡免费观看视频| 91成人精品电影| 国产成人精品久久久久久| 国产精品免费大片| 中文字幕制服av| 亚洲成人av在线免费| 亚洲一级一片aⅴ在线观看| 日韩亚洲欧美综合| 人妻一区二区av| 国产 一区精品| 卡戴珊不雅视频在线播放| 十八禁高潮呻吟视频| 肉色欧美久久久久久久蜜桃| 9色porny在线观看| 18禁动态无遮挡网站| 波野结衣二区三区在线| 精品久久国产蜜桃| 特大巨黑吊av在线直播| 在线看a的网站| 日本猛色少妇xxxxx猛交久久| 97精品久久久久久久久久精品| 国产伦理片在线播放av一区| 极品人妻少妇av视频| 2021少妇久久久久久久久久久| 在线观看免费视频网站a站| 亚洲精品久久久久久婷婷小说| 亚洲精品久久午夜乱码| 精品亚洲成a人片在线观看| 国产成人精品无人区| 亚洲精品国产色婷婷电影| 亚洲精品456在线播放app| 人人妻人人澡人人爽人人夜夜| 日韩三级伦理在线观看| 久久精品久久久久久久性| 五月开心婷婷网| 日韩大片免费观看网站| 久久99热6这里只有精品| 看免费成人av毛片| 一本—道久久a久久精品蜜桃钙片| 五月天丁香电影| 国产不卡av网站在线观看| 欧美日韩在线观看h| 美女福利国产在线| 成人午夜精彩视频在线观看| 一区二区av电影网| 亚洲人与动物交配视频| 国产免费现黄频在线看| 爱豆传媒免费全集在线观看| 亚洲国产欧美日韩在线播放| 大陆偷拍与自拍| 少妇的逼好多水| 国产无遮挡羞羞视频在线观看| 女人久久www免费人成看片| 国产精品国产三级国产av玫瑰| 久久久久精品性色| 久久久久久久久久成人| 中文精品一卡2卡3卡4更新| 麻豆精品久久久久久蜜桃| 久久久国产精品麻豆| 日韩中文字幕视频在线看片| 嘟嘟电影网在线观看| 欧美最新免费一区二区三区| 一边亲一边摸免费视频| 内地一区二区视频在线| 欧美日韩成人在线一区二区| 亚洲av免费高清在线观看| 日韩一区二区视频免费看| 男人操女人黄网站| 亚洲av免费高清在线观看| 色5月婷婷丁香| 亚洲欧美成人综合另类久久久| 亚洲精品日本国产第一区| 色5月婷婷丁香| 99热网站在线观看| 97精品久久久久久久久久精品| 国产成人精品福利久久| 精品一区在线观看国产| 内地一区二区视频在线| 男女边摸边吃奶| 少妇猛男粗大的猛烈进出视频| 午夜影院在线不卡| 最黄视频免费看| 五月天丁香电影| 夜夜爽夜夜爽视频| 亚洲欧美精品自产自拍| 成人影院久久| 青春草国产在线视频| 高清视频免费观看一区二区| 桃花免费在线播放| 另类精品久久| 日本黄大片高清| 免费大片18禁| 日韩欧美一区视频在线观看| 日日撸夜夜添| 久久久久久久大尺度免费视频| 成年美女黄网站色视频大全免费 | 99精国产麻豆久久婷婷| 亚洲国产精品一区三区| 99九九在线精品视频| 97在线人人人人妻| 2022亚洲国产成人精品| 一本一本综合久久| 国产精品.久久久| 一级a做视频免费观看| 中文字幕制服av| 人成视频在线观看免费观看| 99久久综合免费| 久久这里有精品视频免费| 91aial.com中文字幕在线观看| 王馨瑶露胸无遮挡在线观看| 成人午夜精彩视频在线观看| 日本vs欧美在线观看视频| 久久人人爽人人片av| 久久精品人人爽人人爽视色| 国产男女内射视频| 午夜精品国产一区二区电影| 久久久久久久久久久久大奶| 高清欧美精品videossex| 国产精品不卡视频一区二区| 国产成人精品婷婷| av在线app专区| 国产极品天堂在线| 日韩欧美精品免费久久| 黄色配什么色好看| 亚洲av电影在线观看一区二区三区| 涩涩av久久男人的天堂| 久久精品久久久久久噜噜老黄| 成年人午夜在线观看视频| 亚洲国产日韩一区二区| 男女边吃奶边做爰视频| 亚洲国产毛片av蜜桃av| 精品国产一区二区久久| 欧美丝袜亚洲另类| 日韩一本色道免费dvd| 18禁在线无遮挡免费观看视频| 日韩在线高清观看一区二区三区| 中文精品一卡2卡3卡4更新| 纯流量卡能插随身wifi吗| 高清黄色对白视频在线免费看| 亚洲精品久久午夜乱码| a级片在线免费高清观看视频| 女人精品久久久久毛片| 高清毛片免费看| 免费高清在线观看视频在线观看| 99久国产av精品国产电影| 久久精品国产亚洲av涩爱| 少妇的逼好多水| 丝瓜视频免费看黄片| 2022亚洲国产成人精品| 黄色视频在线播放观看不卡| 成年美女黄网站色视频大全免费 | 男女免费视频国产| 美女内射精品一级片tv| 九草在线视频观看| 国产视频首页在线观看| 日韩精品免费视频一区二区三区 | 久久久国产一区二区| 自线自在国产av| av在线观看视频网站免费| 国产精品熟女久久久久浪| 成年人免费黄色播放视频| 色哟哟·www| 欧美成人午夜免费资源| av免费观看日本| 人妻少妇偷人精品九色| 亚洲成人av在线免费| 视频中文字幕在线观看| 蜜桃在线观看..| 一本—道久久a久久精品蜜桃钙片| 晚上一个人看的免费电影| 91午夜精品亚洲一区二区三区| 一本大道久久a久久精品| 日韩,欧美,国产一区二区三区| 亚洲欧洲日产国产| 青春草视频在线免费观看| 日韩精品有码人妻一区| 日本黄色片子视频| 亚洲精品视频女| 国产精品久久久久成人av| 欧美激情极品国产一区二区三区 | 三级国产精品片| 三级国产精品欧美在线观看| 精品久久久精品久久久| 久久久国产精品麻豆| 青青草视频在线视频观看| 在线观看免费视频网站a站| 亚洲av男天堂| 亚洲少妇的诱惑av| 精品久久久久久电影网| 黑人巨大精品欧美一区二区蜜桃 | 亚洲色图综合在线观看| 91精品一卡2卡3卡4卡| 国产国拍精品亚洲av在线观看| 97在线人人人人妻| 少妇人妻久久综合中文| 亚洲国产精品国产精品| av福利片在线| 欧美 日韩 精品 国产| 日产精品乱码卡一卡2卡三| av女优亚洲男人天堂| 女性生殖器流出的白浆| 免费不卡的大黄色大毛片视频在线观看| 亚洲一级一片aⅴ在线观看| 国产一区二区在线观看日韩| 综合色丁香网| 国产69精品久久久久777片| 日韩在线高清观看一区二区三区| 美女主播在线视频| 最近手机中文字幕大全| 赤兔流量卡办理| 婷婷色综合大香蕉| 高清欧美精品videossex| 赤兔流量卡办理| 久久精品国产自在天天线| 嫩草影院入口| 精品一区二区三卡| 日本av免费视频播放| 精品久久久精品久久久| 国产又色又爽无遮挡免| 搡女人真爽免费视频火全软件| a级毛片黄视频| 国产在线视频一区二区| 爱豆传媒免费全集在线观看| 欧美3d第一页| 成人亚洲精品一区在线观看| 午夜激情久久久久久久| 韩国av在线不卡| 久久国产精品大桥未久av| 啦啦啦视频在线资源免费观看| 亚洲久久久国产精品| 搡老乐熟女国产| 成人午夜精彩视频在线观看| 亚洲欧洲日产国产| 国产淫语在线视频| 夫妻午夜视频| kizo精华| 久久综合国产亚洲精品| 在线播放无遮挡| 狂野欧美激情性xxxx在线观看| 亚洲丝袜综合中文字幕| 777米奇影视久久| 国产精品麻豆人妻色哟哟久久| www.色视频.com| 欧美成人午夜免费资源| 色婷婷av一区二区三区视频| 丝袜喷水一区| 日韩三级伦理在线观看| 美女中出高潮动态图| 亚洲av福利一区| 亚洲第一av免费看| 啦啦啦在线观看免费高清www| 乱码一卡2卡4卡精品| 亚洲精品视频女| 最后的刺客免费高清国语| 成人免费观看视频高清| 日韩强制内射视频| 一个人免费看片子| 精品午夜福利在线看| 一级爰片在线观看| 日本猛色少妇xxxxx猛交久久| 大又大粗又爽又黄少妇毛片口| 免费不卡的大黄色大毛片视频在线观看| 精品亚洲成国产av| 欧美精品国产亚洲| 精品人妻在线不人妻| 多毛熟女@视频| 80岁老熟妇乱子伦牲交| 精品亚洲成a人片在线观看| 国产一区二区在线观看av| 亚洲av在线观看美女高潮| 亚洲国产av新网站| 免费黄频网站在线观看国产| 黑人高潮一二区| 日本欧美视频一区| 国国产精品蜜臀av免费| 亚洲精华国产精华液的使用体验| 青春草亚洲视频在线观看| 国产精品不卡视频一区二区| 校园人妻丝袜中文字幕| 国产精品.久久久| av卡一久久| 国产成人精品在线电影| 久久国内精品自在自线图片| 亚洲av欧美aⅴ国产| 九色亚洲精品在线播放| 国产黄色免费在线视频| 999精品在线视频| 精品久久久久久久久亚洲| 国产精品一二三区在线看| 亚洲精品,欧美精品| 超碰97精品在线观看| 日产精品乱码卡一卡2卡三| 国产精品一二三区在线看| 亚洲美女黄色视频免费看| 超碰97精品在线观看| 91aial.com中文字幕在线观看| 99热这里只有是精品在线观看| 久久久午夜欧美精品| 久久人人爽人人片av| 91国产中文字幕| 嘟嘟电影网在线观看| 久久精品久久久久久噜噜老黄| 久久精品国产亚洲av天美| 亚洲欧美成人综合另类久久久| 亚洲精品乱码久久久v下载方式| 亚洲av成人精品一二三区| 亚洲精品第二区| 久久鲁丝午夜福利片| 色5月婷婷丁香| 国产av精品麻豆| 免费高清在线观看视频在线观看| 五月玫瑰六月丁香| 国产黄色视频一区二区在线观看| 尾随美女入室| av免费观看日本| av国产精品久久久久影院| 免费黄色在线免费观看| 高清视频免费观看一区二区| 久久99蜜桃精品久久| 久久综合国产亚洲精品| 蜜桃国产av成人99| 午夜视频国产福利| 免费高清在线观看日韩| 免费播放大片免费观看视频在线观看| 一区二区三区免费毛片| 精品99又大又爽又粗少妇毛片| 高清在线视频一区二区三区| 黑丝袜美女国产一区| 午夜激情久久久久久久| 久久精品国产亚洲网站| 人人妻人人爽人人添夜夜欢视频| 日本与韩国留学比较| 久久人人爽av亚洲精品天堂| 亚洲人成网站在线播| 免费av不卡在线播放| 爱豆传媒免费全集在线观看| 亚洲人与动物交配视频| 不卡视频在线观看欧美| 日本vs欧美在线观看视频| 久久久久精品性色| 另类亚洲欧美激情| 日韩精品有码人妻一区| 男女边吃奶边做爰视频| 黑人巨大精品欧美一区二区蜜桃 | 国产一级毛片在线| 69精品国产乱码久久久| 蜜桃久久精品国产亚洲av| 亚洲怡红院男人天堂| 在线观看人妻少妇| 大片电影免费在线观看免费| 18+在线观看网站| 青青草视频在线视频观看| 成年人免费黄色播放视频| 毛片一级片免费看久久久久| 亚洲性久久影院| 最黄视频免费看| 精品国产国语对白av| 国产日韩欧美在线精品| 亚洲欧美精品自产自拍| 视频区图区小说| 亚洲av欧美aⅴ国产| 满18在线观看网站| 夜夜看夜夜爽夜夜摸| 永久免费av网站大全| 多毛熟女@视频| 一本大道久久a久久精品| 精品亚洲成国产av| 色94色欧美一区二区| 91国产中文字幕| 久久综合国产亚洲精品| 蜜桃国产av成人99| 99视频精品全部免费 在线| av国产久精品久网站免费入址| 亚洲av不卡在线观看| 制服丝袜香蕉在线| 欧美性感艳星| 日本91视频免费播放| 成人手机av| 丰满少妇做爰视频| 黑人巨大精品欧美一区二区蜜桃 | 视频区图区小说| 久久久久久久亚洲中文字幕| a级毛片免费高清观看在线播放| 伦精品一区二区三区| 国产成人a∨麻豆精品| 亚洲国产精品一区二区三区在线| 韩国av在线不卡| 婷婷色综合大香蕉| 又黄又爽又刺激的免费视频.| 男女国产视频网站| 看免费成人av毛片| 婷婷色综合www| 日韩av不卡免费在线播放| 另类精品久久| 亚洲av男天堂| 80岁老熟妇乱子伦牲交| 啦啦啦中文免费视频观看日本| 人人妻人人澡人人爽人人夜夜| 亚洲四区av| 18在线观看网站| 国产欧美日韩一区二区三区在线 | 国产成人午夜福利电影在线观看| av在线播放精品| 99视频精品全部免费 在线| 日韩 亚洲 欧美在线| 国产 一区精品| videos熟女内射| 黑人猛操日本美女一级片| 日本黄色日本黄色录像| 最近手机中文字幕大全| 18在线观看网站| 三上悠亚av全集在线观看| 亚洲精品色激情综合| 80岁老熟妇乱子伦牲交| 在线观看免费高清a一片| 国产女主播在线喷水免费视频网站| 超碰97精品在线观看| 精品一区二区免费观看| 赤兔流量卡办理| 卡戴珊不雅视频在线播放| 国产女主播在线喷水免费视频网站| 婷婷成人精品国产| 亚洲一级一片aⅴ在线观看| 欧美老熟妇乱子伦牲交| 99九九在线精品视频| 一级,二级,三级黄色视频| 亚洲人成网站在线播| 免费久久久久久久精品成人欧美视频 | 亚洲婷婷狠狠爱综合网| 亚洲激情五月婷婷啪啪| 熟妇人妻不卡中文字幕| 欧美国产精品一级二级三级| 亚洲精品美女久久av网站| 大香蕉97超碰在线| 91aial.com中文字幕在线观看| 亚洲国产欧美日韩在线播放| 日本黄色日本黄色录像| 精品久久国产蜜桃| 日韩中文字幕视频在线看片| 五月天丁香电影| 亚洲国产毛片av蜜桃av| 亚洲av中文av极速乱| 亚洲精品国产色婷婷电影| 精品人妻一区二区三区麻豆| 日韩中字成人| 一本久久精品| 女人久久www免费人成看片| 一级毛片电影观看| 狂野欧美白嫩少妇大欣赏| 国产精品久久久久久久电影| 18禁在线播放成人免费| 国产色爽女视频免费观看| 精品人妻偷拍中文字幕| 久久久精品94久久精品| 国产免费又黄又爽又色| 亚洲精品乱久久久久久| 国产 精品1| 人人妻人人澡人人爽人人夜夜| 欧美精品国产亚洲| 欧美精品高潮呻吟av久久| 最新中文字幕久久久久| 性色av一级| 婷婷色麻豆天堂久久| 九色亚洲精品在线播放| 看免费成人av毛片| 国产视频首页在线观看| a级毛片免费高清观看在线播放| 一二三四中文在线观看免费高清| 国产色爽女视频免费观看| 91国产中文字幕| 大片免费播放器 马上看| 亚洲无线观看免费| 日本猛色少妇xxxxx猛交久久| 亚洲av不卡在线观看| 亚洲精品自拍成人| 一区二区三区免费毛片| 亚洲av二区三区四区| 久久99热这里只频精品6学生| 国产av一区二区精品久久| 各种免费的搞黄视频| 黑人巨大精品欧美一区二区蜜桃 | 夜夜看夜夜爽夜夜摸| 啦啦啦视频在线资源免费观看| 亚洲精品美女久久av网站| 在线观看美女被高潮喷水网站| 国产精品99久久久久久久久| 成人18禁高潮啪啪吃奶动态图 | 欧美xxⅹ黑人| 嫩草影院入口| 精品少妇黑人巨大在线播放| 午夜激情久久久久久久| videos熟女内射| 十分钟在线观看高清视频www| 嘟嘟电影网在线观看| 最近中文字幕2019免费版| 有码 亚洲区| 免费看av在线观看网站| 国产成人精品福利久久| 多毛熟女@视频| 久久国产精品男人的天堂亚洲 | 亚洲av二区三区四区| 99九九线精品视频在线观看视频| 内地一区二区视频在线| 国产黄频视频在线观看| 2021少妇久久久久久久久久久| 人妻一区二区av| 多毛熟女@视频| 日韩一区二区视频免费看| 国产男女内射视频| 黄色欧美视频在线观看| 成人国语在线视频| 国产在线一区二区三区精| 亚洲精品日韩av片在线观看| 免费黄色在线免费观看|