单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unified Layer 2(L2)Abstractions for Layer 3(L3)-Driven Fast Handoverrfc5184,Fast Handover For Mobile IPv6 RFC4068,Message Flow-,Predictive,MN,PAR,NAR,RtSolPr,PrRtAdv,FBU,HI,HACK,FBACK,FBACK,forward packets,FNA,deliver packets,L2 trigger,Disconnect,Connect,Message Flow-,Reactive,MN,PAR,NAR,RtSolPr,PrRtAdv,FNAFBU,FBU,FBACK,forward packets,deliver packets,L2 trigger,Disconnect,Connect,This document defines nine kinds of L2 abstractions in the form of primitives to achieve fast handovers in the network layer.,Because the network layer initiates L2 and L3 handovers by using the primitives.,The primitives defined in this document make use of only the information available in the mobile node,IEEE 802.21 introduces the information server in the network,to provide the mobile node with network-related information,such as a global network map.,Unified Layer 2(L2)Abstractions for Layer 3(L3)-Driven Fast Handoverrfc5184,Abstract,Entity,Service User Layer,Service Provider Layer,Inter-Layer,System,Protocol,Entity,Abstract,Entity,Protocol,Entity,Abstract,Entity,Protocol,Entity,Abstract,Entity,Protocol,Entity,Request,Confirm,Indication,Response,Primitives for L2 Abstractions,Request,is the acquisition request of,the lower layer information or a registration,of conditions for,indication,.,In response,confirm,returns.,Indication,is asynchronously delivered,to an upper layer when an event which needs,to be notified occurs.,In response,response,returns.,Using Three different usages of primitives,Type 1.Provide L2 information to upper layers,request:,Acquisition request,confirm:,L2 information,Type 2.Notify upper layers of L2 events,request:,Registration for notification,confirm:,Valid or invalid,indication:,Asynchronous notification,Type 3.Control L2 actions from upper layers,request:,Control,confirm:,Ack or nack,request,confirm,indication,request,confirm,request,confirm,Type 1,Type 2,Type 3,Definitions of Primitives,L2-LinkStatus(Type 1),The L2-LinkStatus.request primitive is sent to the link layer when an upper layer requires the current information of a link.,L2-LinkStatusChanged(Type 2),The L2-LinkStatusChanged.indication primitive is asynchronously provided to an upper layer when the status of a link has changed.,L2-LinkDown(Type 2),The L2-LinkDown.indication primitive is asynchronously provided to an upper layer when an existing link is disconnected and IP packets cannot be transmitted through the link.,L2-LinkUp(Type 2),The L2-LinkUp.indication primitive is asynchronously provided to an upper layer when a new link is connected and IP packets can be transmitted through the new link.,indication,request,confirm,Definitions of Primitives,L2-LinkDisconnect(Type 3),The L2-LinkDisconnect.request primitive is sent to the link layer when an upper layer has to tear down an existing link to the specific PoA.,L2-LinkConnect(Type 3),The L2-LinkConnect.request primitive is sent to the link layer when an upper layer has to establish a new link to the specific PoA.,request,confirm,L3-Driven Fast Handover Mechanism using the L2 triggers,on a MN,L2:Link Layer on MN,L3:Network Layer on MN,req:Request,cnf:Confirm,ind:Indication,MN-L2 MN-L3,|,|,|,=,|,Low|,Signal-LinkStatusChanged.ind-|,|,|Handover,|Preparation,|:,:,:,finish-LinkUp.ind-L3 Handover,|finish,|,Gen.CoA,DAD,ND Cache,routing table setting,CARD,BU,MN-L2 :Link Layer on Mobile Node,MN-L3 :Network Layer on Mobile Node,PAR-L3 :Network Layer on Previous Access Router,NAR-L3 :Network Layer on New Access Router,req :Request,cnf :Confirm,ind :Indication,RtSolPr:Router Solicitation for Proxy,PrRtAdv:Proxy Router Advertisement,FBU :Fast Binding Update,FBack :Fast Binding Acknowledgment,FNA :Fast Neighbor Advertisement,HI :Handover Initiate,HAck :Handover Acknowledge,L3-Driven Fast Handover:FMIPv6 Predictive mode,L3,L2,Time,L2-LinkTo,BeDown,L2-LinkConnect,L2-LinkUp,L2 Handover,L3 Handover Preparation,L3 Handover,RtSolPr,Mobile Node,Previous AR,New AR,HI,FBack,FNA,L2-PeerList,L2-PeerFound/Lost,AP/AR Discovery,FBU,PrRtAdv,HAck,Packets,IEEE802.21 assisted cross-layer architecturalframework to work in a PMIPv6 domain,Magagula,L.A.;Chan,H.A.IEEE 802.21-Assisted Cross-Layer Design and PMIPv6 Mobility Management Framework for Next Generation Wireless Networks,Networking and Communications,2008.WIMOB apos;08.IEEE International Conference on Wireless and Mobile Computing,Volume,Issue,Date:12-14 Oct.2008,Pages:159-164,Signaling call flow diagram of proposedIEEE802.21-assisted handover process,