基于拓?fù)浣Y(jié)構(gòu)的分布式無線傳感器網(wǎng)絡(luò)的功率控制文獻(xiàn)翻譯-資料下載頁
2025-06-24 03:53本頁面
【正文】 ups Gi and Gj, for i≠j, such that a control packets is forwarded from any node of Gi to Gj, then Gi is know as the upstream group with respect to Gj and Gj is the downstream group with respect to Gi.For example ,in , group G1 that contains the sink node is considered as the upstream group with respect to the group G2,G3andG4,as the control packet is initially broadcast from the group containing the sink to other groups of the network. G2,G3 and G4 are the downstream groups with respect to G1. Similarly, G2 can be an upstream groups and in that case,G3 and G4,if control packets are broadcast from G2 to those groups and in that case, G3 and G4 are treated as the downstream groups for G2.Local Hop Counts(LHC):It is a counter, which represents the number of hops that a control packet traverses locally within a group, when it is forwarded from one node to other.The value of LHC of a control packet is initialized to 0 and incremented by 1 for each subsequent hopping of the packet within the same group. In general, LHC=LHC+1. Within a group, if node A forwards a packet to B, and then B forwards the same packet to C, value of LHC in the control packet of A=0,B=1 and C=2.Group Hop Counts(GHC):It is a counter, which represent the number of hops that a control packet passes, when it is transmitted from one group to other. The value of GHC is unique for all nodes of a particular group and it is incremented by 1,if the packet is transmitted from one group to other. Value of GHC is initialized to 0 and in general GHC=GHC+1,for the subsequent hopping of the packet from one group to other.Node Energy Level(NEL):The current energy level of a node is called NEL. For example, at the time of broadcasting a control packet, if energy level of a node is x units, NEL is assigned as x units in the control packet.Parent Gateway Power Level(PGPL):The transmission power level of the parent gateway of any group with which it can be connected with the child gateway of an upstream group is know as Parent Gateway Power Level. Since, sink is always the parent gateway in its group, its PGPL is assigned to 0. However, for the parent gateway of other groups, Pmin ＜PGPL ≤Pmax, which may have value between 1and 3,as per our assumption.Source ID(SID):If A and B are two different sensor nodes of the same or different groups such that A sends packet to B, A is the source for B and ID of node A is the Source ID(SID).3 The distributed power control protocolIn this section we present our power control based topology construction protocol, which constructs the topology dynamically. We assume that each node in the network has s unique ID and each of them knows its onehop neighbor’s ID prior to the construction of the topology. As per the system model of our protocol, since connectivity holes exist among each group of nodes, we assume that the network may be disconnected, if they use low transmission power level between one group of nodes with another and can consume more energy, if they use maximum transmission power level for munication. Moreover, in our assumption the transmission power level for all nodes in the network after deployment could be maximum or in between minimum and maximum. So, in our protocol, a tree topology is constructed among each group of nodes using minimum transmission power level(Pmin=0) and a connected tree topology of the whole network is formed among different group of nodes using an effective power level (PTx),where （Pmin=0）＜ PTx ≤（Pmax=3）.The different phases of this distributed protocol are described as follow
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鄂ICP備17016276號-1