CN101572662A - Energy-saving packet forwarding method based on position information in wireless sensor network - Google Patents

Abstract

The invention belongs to the technical field of energy-saving routing in a wireless sensor network, and in particular relates to an energy-saving forwarding method based on position information in the wireless sensor network. The method defines a novel energy-saving measure, when a node forwards a packet to a sink, an optimal next hop node can be selected, and a node receiving the packet continues the action until the packet reaches a sink node. Thus, the aims of optimizing the energy utilization of nodes in a network and prolonging the service life of the network are achieved.

Description

The wireless sense network energy-saving packet forwarding method of position-based information

Technical field

The invention belongs to wireless sensor network route field.Be specifically related to a kind of in wireless sensor network the energy-conservation retransmission method of position-based information, to reach the target of optimizing node energy utilization in the network, prolonging wireless sensor network life.

Background technology

Wireless sensor network is made up of sensor node and information gathering node (sink), and sensor node is responsible for the collection and the transmission of heat transfer agent, and the sink node is responsible for gathering the data that sensor node is sent in the network.Usually the manager has only by the sink node and could manage other sensor node in the network.

Because node is difficult to reclaim after deployment in the wireless sensor network.Therefore, being difficult to node after deployment changes battery or it is charged once more.And node power exhausts, and just means node death, can't come into operation again.When dead node reached certain ratio in the network, network may be divided into disconnected zone.If there is not the sink node in the zone.This Local Area Network data of gathering just can't send out so, are equal to this all node death of zone.Therefore, the Routing Protocol that needs a kind of balancing energy of research to consume is avoided frequently using some node and is caused it dead fast.

Summary of the invention

The objective of the invention is to design a kind of location-based wireless transducer network energy saving retransmission method, it runs on network layer, finishes the grouping forwarded hop-by-hop of efficient energy-saving.

Technical scheme of the present invention is: each grouping is held node (promptly, the sensor node of holding grouping), when it when sink transmits grouping, according to neighbor information table (ID, the dump energy information that comprise each neighbour of oneself, and the link power information that arrives these neighbours), define and a kind ofly novel energy-conservationly estimate, thereby select wherein best next-hop node; The node of receiving grouping continues this behavior; Arrive the sink node up to grouping.

Method of the present invention is simple and be easy to realize.

Description of drawings

Fig. 1 node x selects to arrive the next-hop node schematic diagram of destination node t from neighbor node.In the legend, alternative next-hop node set is { u, v, w}.

Embodiment

Hold node for a grouping, note is x.X can be any one node in the sensing net, and it can be the node that produces grouping, also can be middle forward node.The hop neighbor of NSx representation node x.The dump energy information of Ex representation node x.Make POW that (x, y) representation node x is to the energy consumption of its unit data of neighbor node y transmission.Make L that (x y) represents link (x, y) the grouping success forward rate on.Make D (x, y) geometric distance between representation node x and the y.Make t represent the sink node.

Node x is transmitting in the process of grouping to information aggregation node t, selects the computational methods of next-hop node as follows.

Alternative how much S={u|D of the at first definite next-hop node of step 1:x (u, t)＜D (x, t), u ∈ NSx}.

Step 2: if S ≠ Φ, node x selects can minimize the neighbours of following value as its next jumping so

$\frac{\mathrm{POW}(x,u)}{E_u}\×\frac{1}{L(x,u)},\∀u\∈\mathrm{NSx}.$

Otherwise node x starts greedy stateless border route (GPSR) algorithm walking around the area, cavity (void) in face of the x node, up to running into one than the x node that there is not the area, cavity in nearer and its front apart from t, restarts this retransmission method.

Receive the node of the grouping that x sends, continue to carry out the packet-forwarding method identical, arrive information gathering node t up to grouping with x.

Fig. 1 has provided node x and how to have selected the next-hop node of arrival destination node t to gather schematic diagram from neighbor node.

It is few that said method requires node to possess information, calculates simply, can take into full account many-sided characteristics such as link power, residue energy of node, loss of link rate, can balance sensing net node energy utilization preferably under distributed environment.

Claims (2)

1, the wireless sense network energy-saving packet forwarding method of position-based information is characterized in that: when node is transmitted grouping to sink, define a kind of new energy-conservation estimate select next redirect to send out node, use the prolongation network lifecycle with this balancing network energy.

2, the energy-conservation retransmission method of position-based information according to claim 1, new energy-conservation geometric distance, the dump energy information of estimating according to each neighbour, link packet success forward rate, and the link power information calculations that arrives these neighbours.

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