Research On Energy-Efficient Forwarding Strategy For Named-Data Networking

NDN(Named Data Networking)is a new clean slate next generation networking framework which named the data directly to make the distribution of content more effective and use the named data as the center of network.Due to the huge difference between TCP/IP networking framework and NDN,the traditional energy-efficient forwarding strategies can't be used to NDN directly.The main reasons are as following:1)NDN creates a new concept called node interface which can influence the efficiency of forwarding;2)short of detail solutions for message transportation and path selection when applying NDN to mobile situation;3)traditional network multipath forwarding strategies will no longer be suitable for NDN.Taking all the reasons into consideration,we focus on the research about energy-efficient forwarding strategies for NDN.The main contributions of this paper are as following:(1)An active-detect forwarding strategy called DFFL(Detect First Forward Later)which use the real-time node interface status as important factor.There are three main phases in DFFL:registration phase,detection phase and best interface forwarding phase.In DFFL,a detection message will be sent before marking an interface status as invalid in FIB table.This can avoid the wrong judge caused by the delay of time.The experiment result shows that DFFL is suitable for NDN,especially for lowering the network delay,decreasing hops of message transportation and decreasing the retransmission times of message.(2)Energy-efficient forwarding strategies for NDN MANET called LAFS(Lifetime-aware forwarding strategy)and AOFS(Avoid-overhearing forwarding strategy).In LAFS,the node's energy status is defined to be three phases by setting two energy threshold values Max and Min.Node can take different reaction to request according to different remaining energy.LAFS can prolong the whole-network lifetime,lower the network delay by controlling the response way of low-power energy nodes.The simulation experiments prove the effectiveness of LAFS.In AOFS,we set the relay nodes to avoid unnecessary listening and response of nodes caused by message broadcasting.Taking the remaining energy and distance of nodes into consideration can make the overlap areas of relay nodes as small as possible and protect the low-power energy nodes.AOFS performs better when compared with existing forwarding strategies.(3)A multipath forwarding strategy called VNMF(Virtual Node Multipath Forwarding Strategy)for NDN.VNMF takes the advantage of NDN's nature born multi-source and multipath features.By modifying the existing NDN forwarding strategies and adding virtual nodes,VNMF becomes a more common strategy which can adapt to NDN multipath forwarding situation.There are four phases in VNMF called detection phase,message acknowledging phase,formal requesting phase and returning data through multipath.In the detection phase,consumer node sends the detection message and the source node will return the acknowledgement message which contains the information of node's content store.Then virtual node will send request and get data through multipath.The simulation experiment result shows that VNMF can improve forwarding efficiency by sufficiently using different data fragments in multisource.