CN1921436A

CN1921436A - Stabilizing energy-saving grouping method

Info

Publication number: CN1921436A
Application number: CN 200610099447
Authority: CN
Inventors: 刘凯; 张军; 宋学贵
Original assignee: Beihang University
Current assignee: Beihang University; Beijing University of Aeronautics and Astronautics
Priority date: 2006-07-20
Filing date: 2006-07-20
Publication date: 2007-02-28
Anticipated expiration: 2026-07-20
Also published as: CN100568843C

Abstract

The invention relates to a stable energy-saving group method, which comprises: setting the group first inquire clock; the group first inquires the member node to obtain relative mobile property, relative left energy state and local node degree, to calculate the selective weight of member node; the group first judges if the selective weight is lower than selective threshold value, if it is, activates the candidate node which will send the group first message to be group first; or else, keeping the group first; the group first selects the member node with maximum selective weight as candidate node. The invention uses timed inquire method to detect the state of node, to maintain the group structure on time, based on the network topology change, to confirm its stability, balance energy consumption and prolong the service life.

Description

Stabilizing energy-saving grouping method

Technical field

The present invention relates to a kind of network grouping method that forms and keep layered distribution type structure, particularly a kind of stabilizing network that provides divides group structure, the balanced stabilizing energy-saving grouping method that consumes and prolong the whole life span of network of assurance node energy.

Background technology

In the mobile ad-hoc network, before communicating, need to form predetermined network configuration, so that realize support, control and management to communication through process of self-organization.That these network configurations are divided into usually is distributed fully, layered distribution type and centralized three classes.Wherein, for wireless, multi-hop, the mobility of supporting self-organizing network, layered distribution type structure (promptly dividing group structure) is the most effective control and management method.Divide group structure be utilize hive off agreement all nodes in the whole network incorporate into a plurality of continuous be the group at center with cluster (CH), be responsible for control and management in the group by cluster, its advantage comprises: improve channel space reuse efficient, reduce route and network control administration overhead, easily realize congested control and flow equalization, for multimedia service give security the transmission of service quality (QoS), easily realize network mobile management and local synchronization, be suitable for expanding the self-organizing network that has great deal of nodes etc.

In the mobile ad-hoc network, node move, add, leave away or situation such as inefficacy has caused the disconnecting of communication link and the variation of network topology, this shows as node and often adds or leave the group after hiving off, influence divides the stable of group structure and even network service.Even more serious situation is, decomposition, reconstruct that violent node motion causes frequent cluster to substitute and hive off, bigger communication and computing cost have been introduced, and then have a strong impact on other network performances, as signal post's route, end-to-end throughput, time delay, discarded ratio of packet and all kinds of resource management utilizations etc.Therefore for hierarchy, the problem of most critical is how to collect, use topology information, sets up predetermined branch group structure fast, and the dynamic stability that is implemented under the high-speed mobile environment keeps.This problem is solved by the grouping method and two aspects of maintenance method of hiving off, grouping method is the branch group structure that forms network on the basis of surveying topology, mainly be the cluster selection course, but the maintenance method of hiving off then is the branch group network that keeps stable continuous communiction under the node motion situation.The grouping method and the maintenance method of hiving off normally utilize some feature of node or factor as the foundation of hiving off and hiving off and keeping, and promptly these features or factor are mapped to a kind of weight, when the weight of a certain node local when maximum, this node just is chosen as cluster.The existing grouping method and the maintenance method of hiving off are respectively:

(1) minimum intrinsic (Lowest ID) method of number hiving off

In this method, the node that has minimum ID in the neighbors is selected as cluster, keeps the cluster of minimum ID when two clusters meet.This method only needs the exchange of two-wheeled control messages can set up the branch group structure, has very fast, the advantages such as the maintenance process is simple of hiving off of branch group velocity.But this method is not considered the influence of node motion factor in the cluster election and the maintenance process of hiving off, make the node of minimum ID consume more energy owing to serving as cluster, if the node motion of local minimum ID is very fast, the frequency of group's decomposition and reconstruct is just very big, can cause the deterioration of network performance.

(2) maximum connection degree (Max Degree) method of hiving off

This method is utilized the maintenance of hiving off and hive off of the standard of maximum connections degree (being the neighbors number of node), and its target is control and management to be weighed to give neighbors more node as far as possible.The advantage of this method is that the number that hives off is less, has reduced packet transfer delay, but shortcoming is the space division multiplexing that has reduced channel.Simultaneously, when group's interior nodes number more for a long time, on average the throughput to each node will reduce, and makes the easier bottle-neck of network communication that becomes of cluster, the overall efficiency of network will decrease.In addition, because this grouping method must obtain the connection degree of node before carrying out, this needs many exchanges one take turns self-organizing message, so also there are long, defectives such as expense is big, cluster and member's poor stability of networking time in this method.

(3) distributed moveable self-adaption (DMAC) method of hiving off

This method is according to the weighted value of the prior appointment of node, and the node that has weight limit in neighbors is chosen as cluster, and junction link inefficacy after this, foundation and node add the incoming event maintenance of hiving off.But this method is not considered node mobility, and the high-speed mobile of high weight cluster can have a strong impact on the performance of whole network, and the weighted value that is adopted in the algorithm is prior appointment, and its meaning and the characteristic that how to reflect node in the network are not described.

(4) non-ly determine-determine to mix (UC-CM) method of hiving off

This method is introduced the maintenance of hiving off and hive off of " priority " parameter, and the priority of node is high more, the preferential more cluster that becomes.This method is same because do not consider the node motion factor affecting, when cluster moves when very fast, the group decompose and the frequency of reconstruct just very big, cause the deterioration of network performance.

(5) based on hiving off (ABCP) of inserting with based on the self-organizing that channel inserts (CABSOC) method of hiving off

This method considers to hive off agreement from the angle that channel inserts, node becomes cluster or adds the group who has existed with regard to attempting to utilize designed channel access method from the beginning, the maintenance of hiving off of meeting, entering non-activity attitude, being correlated with when abnormal conditions incidents such as (as node failure, information drop-outs etc.) occurs when cluster.Because the former need utilize periodic HELLO message or heart-beat inquire response message to show the existence of cluster and ordinary node, the latter needs each node periodic broadcast beacon (Beacon) to declare the existence of this node, has long, defective such as expense is bigger of networking time.

(6) based on (MOBIC) method of hiving off of mobility mechanism

This method be overcome said method do not consider the node motion factor technological deficiency, the received signal power of receiving grouping continuously likened to be the weight of relatively moving property between the assessment node, and utilize this weight to select cluster and maintenance to hive off.Because the prerequisite of this method hypothesis is not have multipath and influence of fading in the radio signal propagation channel, aspect node mobility, only considered the mobility of node monomer, and need information, make that this method exists still in actual applications that expense is big, defectives such as cluster and member's poor stability at a distance of two hop nodes.

(7) based on weights (WCA) method of hiving off

This method has been considered the best member node number that node can support as cluster, through-put power, mobility and the dump energy state of node, the node of selecting to have minimum weights in neighbours' scope becomes cluster-head, and it also is to call grouping method by event driven manner to realize that the repair and maintenance that hive off are held.But the character pair that each weights component that this method proposed can not fine embodiment node, the calculating of weights need be carried out a large amount of information exchanges and calculating, brings a large amount of expenses.

In sum as can be seen, the maintenance method of hiving off of above-mentioned prior art all is the collection of nodal information in the trigger network passively after network topology changes, can obtain to hive off by a large amount of information interaction expenses again and safeguard required network node state information, be completely passive maintenance, have problems such as efficient is low, expense is big.In addition, the grouping method of above-mentioned prior art or do not consider node mobility, though or considered node mobility, can not embody the character pair of node well.On the one hand just in node motion, network, move back net or inefficacy and go to tackle these variations after causing topology to change, and node mobile is to cause change in topology, the influence constitutionally stable principal element of hiving off, so correlation technique can not fundamentally effectively guarantee the stable of branch group structure; Have mass message exchanging and computing cost on the other hand in actual applications, it is rapid inadequately to divide group structure to form, and has technological deficiencies such as energy consumption is unbalanced, the network bulk life time is short.

Summary of the invention

The objective of the invention is to cause that network performance worsens, expense is big and technological deficiency such as energy consumption is unbalanced at the passive maintenance of branch group structure, poor stability, the minority node motion that exist in the existing maintenance method of hiving off and hive off, a kind of stabilizing energy-saving grouping method is provided, under high-speed mobile environment, can effectively guarantee the stability of structure of hiving off, guarantee that simultaneously node takes on the fairness of cluster, thereby balanced energy consumption prolongs the network bulk life time.

To achieve these goals, the invention provides a kind of stabilizing energy-saving grouping method, comprise step:

Step 10, setting group first inquire clock;

Step 20, startup poll clock;

Step 30, judge whether the poll clock is overtime, and execution in step 40 when overtime, not overtime then execution in step 30;

Member node in the step 40, group first inquire group is obtained relatively moving property value, relative surplus energy state value and the local node degree value of member node, calculates the selection weights of each member node;

Step 50, cluster judge it selects weights whether to be lower than the selection threshold value, are execution in step 60 then, otherwise execution in step 70;

Step 60, cluster activate both candidate nodes in the group, and both candidate nodes sends cluster message, announce to become new group first, and other member node and former cluster add new group, and new branch group structure forms;

Step 70, cluster are selected both candidate nodes, and both candidate nodes monitors cluster state, execution in step 20;

Wherein, the selection weights of node are W in the described step 40 _i=w ₁S _i+ w ₂P _i+ w ₃R _i,

In the formula, i represents node ID, W _iThe selection weights of expression node i, S _iThe expression node i is with respect to the relatively moving property value of its neighbor node, P _iThe relative surplus energy state value of expression node i, R _iThe local nodes degree value of expression node i, coefficient w ₁, w ₂And w ₃Be the weighted value of relevant parameter, and ∑ w _i=1.

Wherein, described step 70 is specially:

The member node that step 71, cluster selection have maximum selective weight is a both candidate nodes;

Step 72, cluster broadcast distribution message are announced both candidate nodes ID and each member node selection weights;

Step 73, both candidate nodes are made regular check on the periodic message of whether receiving cluster-head broadcasting, and execution in step 20 when receiving, execution in step 74 when receiving;

Step 74, both candidate nodes send apply for information to cluster;

Step 75, both candidate nodes judge whether to receive the affirmation message of cluster, and execution in step 20 when receiving, otherwise execution in step 76;

Step 76, both candidate nodes judge whether the inquiry count value surpasses the inquiry count threshold, are execution in step 77 then, otherwise will inquire count value add 1 after execution in step 74;

Step 77, both candidate nodes activate automatically, send cluster message, announce to become new group first, and other member node and former cluster add new group, and new branch group structure forms, and returns execution in step 20.

In technique scheme, in the described step 30 when judging that the poll clock is not overtime, execution in step:

Step 31, network topology monitor automatically, survey the structural change of hiving off;

Whether step 32, judgement divide group structure to change, and execution in step 33 when hiving off structural change, otherwise execution in step 30;

Step 33, according to the different event type, call the corresponding processing program topology update of hiving off, upgrade and finish back execution in step 30.

Call in the described step 33 that corresponding processing program carries out that the renewal of branch group structure comprises that node add to be handled, node withdraws from processings, cluster meets processings, node disengaging cluster processing or member node crash handling.

In technique scheme, also comprise network is carried out the step that initialization is hived off, be specially:

All node broadcasts message in step 1, the network, described message comprises node ID and residual energy value;

Step 2, each node are according to receiving that message generates a neighbor node table;

Whether step 3, each node judge its residual energy value greater than energy threshold, are execution in step 4 then, otherwise execution in step 6;

Step 4, described node judge that whether its node ID do not divide in the group node for minimum in neighbours' scope, are execution in step 5 then, otherwise execution in step 7;

Step 5, described node send cluster message, announce to set up new group, and described new group ID is the ID of this node, and stabilizing energy-saving grouping finishes;

Step 6, described node wait for that until the cluster message of receiving from neighbor node, node adds this group becomes member node, and stabilizing energy-saving grouping finishes;

Step 7, described node judge whether to receive the cluster message from neighbor node in a setting-up time, execution in step 8 when receiving, otherwise return execution in step 4;

Step 8, node add this group becomes member node, and stabilizing energy-saving grouping finishes.

Stabilizing energy-saving grouping method of the present invention is at the violent influence of node mobility to the structural stability of hiving off, proposed a kind of by periodic polling mode monitoring network node state with upgrade to divide a group structure, to the stable energy-saving group maintenance method that minute group structure carries out necessary maintenance, a kind of energy-conservation initialization grouping method has also been proposed.

Under initial condition, the present invention adopts energy-conservation initialization grouping method that network is carried out initialization to hive off, and all its roles of node final decision obtain a branch group structure that covers the whole network.The election of cluster-head in the method is based on the ID of node and the residual energy value P of node, when the residual energy value P of node greater than energy threshold P _ThresholdThe time, and its node ID is minimum in its neighbours' scope, and this node will be elected as cluster-head so, and its neighbor node all joins wherein becomes member node.Cluster-head electoral considerations of the present invention residue energy of node value P, and whether possesses the prerequisite that becomes cluster as weighing node, therefore the present invention not only has the exchange that only needs the two-wheeled control messages and can set up the branch group structure, divide group velocity very fast, the advantages such as the maintenance process is simple of hiving off, and owing to considered the dump energy state of node in the cluster election stage, avoided the low node of some dump energy to take on the possibility that cluster and part of nodes are taken on cluster for a long time, guaranteed that node takes on the fairness of cluster, thereby balanced energy consumption, can be as the node of cluster because of the energy consumption ambassador stability of structure variation at short notice of hiving off, eliminated therefore that the prior art group decomposes and the reconfiguration frequency increasing, technological deficiencies such as network performance deterioration.

Hiving off the structural maintenance stage, the present invention adopts by periodic polling mode monitoring network node state to upgrade the stable energy-saving group maintenance method that divides group structure, minute group structure is carried out necessary maintenance, a kind of selection weights notion has been proposed simultaneously, the criterion of election cluster when changing as cluster.The periodic polling mode is a kind of structural maintenance mode of hiving off of active, when former cluster can not be born the cluster role, activate standby cluster rapidly and take on the cluster role, can in time adapt to the structural change of hiving off that node motion and cluster energy consumption are brought, effectively guarantee to hive off stability of structure.The present invention elects a both candidate nodes as standby cluster according to the selection weights size of node for each cluster, select weights to consider relatively moving property, relative surplus energy state and the local node degree of node, and above-mentioned node diagnostic is organically combined by weighted value.The standard of election cluster makes the present invention can effectively guarantee the stability of structure of hiving off when selecting weights to change as cluster, guarantees that simultaneously node takes on the fairness of cluster, thus balanced energy consumption, the bulk life time of prolongation network.

In addition, the present invention is adopting the periodic polling mode that network state information is carried out more shape, and then when minute group structure carried out necessary maintenance, by network topology being monitored automatically and the structural change detection of hiving off, at cluster meets, member node breaks away from former group, node adding with situation such as withdraw from and designed corresponding handling procedure, the periodic polling of minute group structure and maintenance are at any time organically combined, make the present invention have broad adaptability.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Description of drawings

Fig. 1 is a stabilizing energy-saving grouping method flow chart of the present invention;

Fig. 2 is the flow chart of the embodiment of the invention one;

Fig. 3, Fig. 4 are the flow chart of the embodiment of the invention two

Fig. 5 adds process chart for node of the present invention;

Fig. 6 withdraws from process chart for node of the present invention;

Fig. 7 is the cluster of the present invention process chart that meets;

Fig. 8 breaks away from the cluster process chart for node of the present invention;

Fig. 9 is a member node crash handling flow chart of the present invention;

Figure 10 is the initialization of the present invention flow chart that hives off.

Embodiment

Fig. 1 is a stabilizing energy-saving grouping method flow chart of the present invention, is specially:

Step 10, setting group first inquire clock;

Step 20, startup poll clock;

Step 30, judging whether the poll clock is overtime, is execution in step 40 then, otherwise execution in step 30;

Technique scheme is actually a kind of stable energy-saving group maintenance method, its member node of cluster periodic polls is to obtain relatively moving property value S, relative surplus energy state value P and the local node degree value R of node, cluster is that all member node that oneself reach it are calculated selection weights W then, and election has the both candidate nodes of the member node of maximum selective weight as it.When being reduced to, the group leader selection weights select threshold value W _ThresholdBelow, to such an extent as to it can not take on the cluster role time, former cluster can send and activate the message activation both candidate nodes and become new cluster-head.At this moment, the new group first node is announced oneself new role by broadcasting cluster message, receive this cluster message after, its neighbor node, comprise that original cluster-head all adds the new group of message adding or joins among the contiguous group new branch group structure formation by sending.

Stabilizing energy-saving grouping method of the present invention is at the violent influence of node mobility to the structural stability of hiving off, not only proposed a kind of by the stable energy-saving group maintenance method of periodic polling mode monitoring network node state to upgrade the branch group structure, minute group structure to be carried out necessary maintenance, a kind of selection weights notion has also been proposed, the criterion of election cluster when changing as cluster.Stable energy-saving group maintenance method of the present invention is a kind of structural maintenance mode of hiving off of active, has broken through prior art is only just carried out respective handling when minute group structure goes wrong passive maintenance mode.In mobile ad-hoc network, node consumes more energy owing to serving as cluster, the high-speed motion of the node structural stability that will cause hiving off is very poor, therefore situation about having worsened in the structural stability of hiving off is carried out passive maintenance, not only introduce a large amount of control expenses, and be difficult to obtain stable hiving off.The periodic polling mode that the present invention proposes has then solved the above-mentioned technical problem of prior art effectively, the present invention selects the weights size to elect a both candidate nodes as standby cluster for each cluster according to node, when former cluster can not be born the cluster role, activate standby cluster rapidly and take on the cluster role, can in time adapt to the structural change of hiving off that node motion is brought, guarantee to hive off stability of structure effectively, guarantee that simultaneously node takes on the fairness of cluster, thereby balanced energy consumption, the bulk life time of prolongation network.

Right to choose value defined of the present invention is:

W _i＝w ₁S _i+w ₂P _i+w ₃R _i

In the formula, i represents node ID, W _iThe selection weights of expression node i, S _iThe expression node i is with respect to the relatively moving property value of its neighbor node, P _iThe relative surplus energy state value of expression node i, R _iThe local nodes degree value of expression node i, coefficient w ₁, w ₂And w ₃Be the weighted value of relevant parameter, and ∑ w _i=1.。

The present invention selects weights W _iRelatively moving property, relative surplus energy state and the local node degree of node have been considered, and by weighted value above-mentioned node diagnostic is organically combined, according to the actual features of system requirements and network can the dynamic adjustments weighted value to adapt to different system requirements.Node can consume more energy owing to serve as cluster, the relative surplus energy state can reflect the energy state of node well, guarantee that electing the node that has than macro-energy within the specific limits becomes cluster, avoided the lower node of relative surplus energy to take on cluster role's possibility, therefore the balanced consumption of node energy in the network has prolonged network life; The high-speed motion of node will cause the frequent variations of node connectivity, will introduce a large amount of control expenses simultaneously in maintenance process, and the relatively moving property that the present invention selects weights to introduce node can guarantee the stability of structure of hiving off well; The local nodes degree of node reflects the link condition of member node among this node and the former group, this value is big more, represent that then member node many more among corresponding node and the former group is connected, the structural change of hiving off that causes when this node becomes cluster-head is compared minimum with former minute group structure, therefore can keep original branch group structure well, improve stability, and reduced the mutual expense of bringing because of member node replacing cluster.The standard of election cluster makes the present invention can effectively guarantee the stability of structure of hiving off when selecting weights to change as cluster, guarantees that simultaneously node takes on the fairness of cluster, thus balanced energy consumption, the bulk life time of prolongation network.Owing to adopted a kind of mode monitoring network node state of active poll so that a minute group structure is safeguarded among the present invention, needed information can both obtain by periodic polling, need not to carry out obtaining of relevant information by passive alternant way, reduce the exchange of information to a great extent, reduced expense.Simultaneously, owing to adopt the standard of election cluster when selecting weights to change as cluster, taken into full account the factor that causes network topology change, improved the stability of structure of hiving off, thereby reduced the number of times of the structural remodeling that hives off in the maintenance process of hiving off, also reduced expense to a great extent.

The present invention can be according to the actual features of system requirements and network to weighted value w ₁, w ₂And w ₃Carry out dynamic adjustments, to adapt to different system requirements.For example, for wireless sensor network, because node mobility is very low, it is the energy state of node that influence divides the principal element of group structure, and w can be set ₁=0.05～0.10, w ₂=0.80～0.90, w ₃=0.05～0.10; For the wireless self-organization network under the high-speed mobile environment, it is the mobility of node that influence divides the principal element of group structure, and the power supply of node can change, and energy no longer is the main factor of considering, w can be set ₁=0.45～0.55, w ₂=0.05～0.10, w ₃=0.40～0.50.

Further specify technical solution of the present invention below by specific embodiment.

Embodiment one

Fig. 2 is the flow chart of the embodiment of the invention one.As shown in Figure 2, the technical scheme of present embodiment is that described step 70 is specially on technical scheme shown in Figure 1 basis:

Step 74, both candidate nodes send apply for information to cluster;

Step 75, both candidate nodes judge whether the affirmation message of receiving that cluster returns, and execution in step 20 when receiving, otherwise execution in step 76;

Step 76, both candidate nodes judge whether the inquiry count value surpasses the inquiry count threshold, are execution in step 77 then, otherwise will inquire that count value adds 1, return execution in step 74;

The concrete processing procedure of present embodiment is: at the maintenance phase that hives off, its rank and file's node of cluster periodic polls is to obtain the relatively moving property value S of node, node relative surplus energy state value P and local node degree value R, then, cluster is that all member node that oneself reach it are calculated selection weights W.Select weights to drop to when cluster-head and select threshold value W _ThresholdBelow, to such an extent as to it can not take on the cluster role time, former cluster can send and activate the message activation both candidate nodes and become new cluster-head.This moment, the new group first node was announced the new role of oneself by broadcasting cluster message.After receiving this cluster message, its neighbor node comprises that original cluster-head is all by sending the new group of adding message adding or joining in contiguous group.If cluster-head selects weights selecting threshold value W _ThresholdMore than, illustrate that it still can take on the cluster role.No matter be that former cluster continues to take on the cluster role or new group first replaces former cluster, former cluster or new group first are all elected member node with maximum selective weight both candidate nodes as it, and broadcast the both candidate nodes message that comprises both candidate nodes ID and all nodes selection weights, both candidate nodes is as the standby existence of cluster-head.Afterwards, both candidate nodes can monitor the cluster state by checking the periodic message of whether receiving cluster-head broadcasting, and when both candidate nodes can not be received cluster message in a period of time, it can send an apply for information.If cluster also exists, it will send an acknowledge message.Still can not receive that after attempting certain number of times both candidate nodes will think that former cluster disappears when confirming, so both candidate nodes broadcasting cluster message, announce to become new group first.Can not communicate by letter with its former cluster if receive the node of this cluster message, they will be selected to join among the new group or join among other adjacent groups.

The present embodiment technical scheme has further been guaranteed the stability of structure of hiving off, and particularly when cluster went wrong, whether both candidate nodes can in time be judged cluster and exist, and fundamentally effectively guarantees to divide the stable of group structure under high-speed mobile environment.

Embodiment two

The technical scheme of present embodiment is on Fig. 1, technical scheme shown in Figure 2 basis, in the described step 30, when judging that the poll clock is not overtime, carries out following step:

Present embodiment is at periodic polling mode renewal network state information, and then upgrade to divide a group structure, when minute group structure is carried out necessary maintenance, by network topology being monitored automatically and the structural change detection of hiving off, and, the branch group structure that changes is called the corresponding processing program topology update of hiving off according to the result who monitors and survey.This technical scheme will divide the periodic polling of group structure and maintenance at any time organically to combine, initiatively poll can regularly obtain required information, and other less network topology change are safeguarded at any time and are in time disposed, both improve the stability of structure of hiving off, reduced the structural remodeling number of times that hives off again.

Fig. 3 and Fig. 4 have illustrated the corresponding flow chart of present embodiment respectively, concrete processing procedure is: after setting group first inquire clock, cluster only just begins polling operation after the poll clock is overtime, if the time does not arrive, system then monitors automatically to network topology and the structural change of hiving off is surveyed, judge to divide group structure whether to change, if change, then call the corresponding processing program topology update of hiving off, upgrade and finish the back and continue that network topology monitors automatically and the structural change of hiving off is surveyed according to the different event type.Wherein incident is meant the corresponding event that triggers the structural change of hiving off, and the present invention is provided with corresponding handling procedure according to the event type of the structural change that causes hiving off, in time a minute group structure is upgraded.

Embodiment three

Present embodiment is on embodiment two technical scheme bases, calls the corresponding processing program topology update of hiving off in the step 33 and comprises that node add to handle.Fig. 5 is specially for node of the present invention adds process chart:

Steps A 1, new node join in the network;

Steps A 2, new node are alternately monitored all channels in the network;

Steps A 3, new node join according to snoop results among the group at the cluster place with maximum selective weight, become the member node of this group.

When node joined in the network, it need alternately monitor all channels in the network, and based on snoop results, the group that node can select to join the cluster place with maximum selective weight becomes its rank and file's node.

Embodiment four

Present embodiment is on embodiment two technical scheme bases, calls the corresponding processing program topology update of hiving off in the step 33 and comprises that node withdraws from processing.Fig. 6 is specially for node of the present invention withdraws from process chart:

Step B1, withdraw from node and send the net request of moving back to cluster-head;

Step B2, cluster-head withdraw from one of node transmission to this and leave confirmation, and delete the described node that withdraws from from its member's tabulation;

Step B3, withdraw from that node receives that cluster replys leave confirmation after, normal deviated from network.

When node will exit network, it can send moves back net request notice cluster-head, cluster-head can send one to this node leave confirmation and its this node of deletion from member's tabulation, and after receiving the affirmation information that cluster is replied, this node is normal deviated from network just.

Embodiment five

Present embodiment is on embodiment two technical scheme bases, calls the corresponding processing program topology update of hiving off in the step 33 and comprises the cluster processing of meeting.Fig. 7 is the cluster of the present invention process chart that meets, and is specially:

Step C1, the kinetic network topology change of node are met two clusters;

Step C2, judging whether a cluster can comprise another cluster and member node thereof, is execution in step C3 then, otherwise execution in step C4;

Step C3, two groups merge, and form new group, and cluster meets and disposes;

Step C4, branch group structure remain unchanged, and cluster meets and disposes.

When two clusters meet, if a cluster and the formed set of its neighbor node can comprise another cluster and its rank and file's node, two groups of person will merge so, the cluster that can cover two original all rank and file's nodes becomes new group first, and another group disappears.Under other situations, divide group structure to remain unchanged.

Embodiment six

Present embodiment is on embodiment two technical scheme bases, calls the corresponding processing program topology update of hiving off in the step 33 and comprises that member node breaks away from cluster and handles.Fig. 8 is specially for node of the present invention breaks away from the cluster process chart:

Step D1, the kinetic network topology change of node make member node and its cluster at a distance of double bounce or more than the double bounce;

Step D2, described member node are monitored the used channel of other groups;

Step D3, member node judge whether to exist cluster adjacent with it, are execution in step D4 then, otherwise return execution in step D2;

Step D4, member node join according to snoop results among the group at the cluster place with maximum selective weight, become newcomer's node of this group;

Step D5, described newcomer's node send to former cluster and add new group's message;

Step D6, former cluster this member node of deletion from its member's tabulation.

If rank and file's node and its cluster are at a distance of double bounce above (comprising double bounce), it can monitor the used channel of other groups so, if find to have cluster and own adjacent (as there being the new group first of jumping at a distance of), this node can select to join a group based on the group leader selection weights that listen to.Add after the new group, this node can be notified former cluster as via node by the adjacent rank and file's node among the former group, and former then cluster will be with its deletion from the member's tabulation of oneself.If snoop results is not found satisfactory cluster and exists that this node can continue to keep in touch with former cluster by via node, and continues to monitor the used channel of other groups, until finding satisfactory cluster and joining new group.

Embodiment seven

Present embodiment is on embodiment two technical scheme bases, calls the corresponding processing program topology update of hiving off in the step 33 and comprises the member node crash handling.Fig. 9 is a member node crash handling flow chart of the present invention, is specially:

Step e 1, the kinetic network topology change of node make cluster not receive member node message in a period of time;

Step e 2, cluster send apply for information to member node;

Step e 3, cluster judge whether the affirmation message of receiving that member node is returned, execution in step E4 when receiving, otherwise will inquire that count value adds 1, execution in step E5;

Step e 4, keep former minute group structure constant, node failure disposes;

Step e 5, cluster judge whether the inquiry count value surpasses the inquiry count threshold, are execution in step E6 then, otherwise return execution in step E2;

Step e 6, cluster are tabulated from the member and are deleted this member node, and node failure disposes.

When node failure causes under the abnormal condition deviated from network, if cluster does not receive in a period of time from the data of this node or do not receive confirmation that after giving out a contract for a project to this node cluster can send an apply for information to this node.If this node still exists, it can send confirmation to cluster.Otherwise cluster is not still received the affirmation information of answer after attempting repeatedly sending inquiry message, and then cluster thinks that this node disappears, and with its deletion from the member's tabulation of oneself.

Embodiment eight

The technical scheme of present embodiment is on Fig. 1～technical scheme shown in Figure 9 basis, has increased network is carried out the step that initialization is hived off.Figure 10 is the initialization of the present invention flow chart that hives off, and is specially:

Step 5, described node send cluster message, announce to set up new group, and described new group ID is the ID of this node, and initialization is hived off and finished;

Step 6, described node wait for that until the cluster message of receiving from neighbor node, node adds this group becomes member node, and initialization is hived off and finished;

Step 8, node add this group becomes member node, and initialization is hived off and finished.

The present embodiment technical scheme is actually a kind of energy-conservation initialization grouping method, and the cluster-head election in the method is based on node ID and residual energy value P, promptly works as the residual energy value P of node greater than energy threshold P _ThresholdThe time, and its node ID is minimum in its neighbours' scope, and this node will be elected as cluster-head so, and its neighbor node all joins wherein becomes member node.Specifically, at first, all node broadcasts comprise the message of node ID and residual energy value P in the network, take turns each node of broadcasting by this and can know the neighbor node situation of oneself, and each node is set up a neighbor node table.Under initial condition, the selection weights W of all nodes is set to-1.If the residual energy value P of node is less than energy threshold P _Threshold, the primary condition that this node does not possess becomes cluster is described, finally be bound to receive cluster message from neighbor node, node adds this group becomes member node; If the residual energy value P of node is greater than energy threshold P _Threshold, and in its neighbours' scope, do not divide and have minimum ID in the group node, this node will send cluster message and announce to set up new group, and group ID is the ID of this node.If node discovery self node ID is not a minimum, it will face or join other groups, or it is minimum in neighbours' scope up to himself node ID to wait for a period of time, and set up new group.

In the energy-conservation initialization grouping method that present embodiment provides, each node only need send the two-wheeled control messages just can form the branch group structure fast, after method executed, therefore the role that all nodes can both final decision oneself can obtain an initial minute group structure that covers the whole network.Compare with existing relevant grouping method, node ID has not only been considered in the cluster-head election of the energy-conservation initialization grouping method of the present invention, also comprises residual energy value P, and whether residual energy value P is possessed the prerequisite that becomes cluster as weighing.So, the present invention not only has the exchange that only needs the two-wheeled control messages can set up the branch group structure, it is very fast to have the branch group velocity, the advantages such as the maintenance process is simple of hiving off, and owing to considered the dump energy state of node in the cluster election stage, avoided the low node of some dump energy to take on the possibility that cluster and part of nodes are taken on cluster for a long time, guaranteed that node takes on the fairness of cluster, thereby balanced energy consumption, can be as the node of cluster because of the energy consumption ambassador stability of structure variation at short notice of hiving off, eliminated therefore that the prior art group decomposes and the reconfiguration frequency increasing, technological deficiencies such as network performance deterioration.Owing to considered the dump energy state of node, guaranteed that node takes on the fairness of cluster, thereby balanced energy consumption reaches the effect that prolongs the network bulk life time in the cluster election stage.

The present embodiment flow process simply is described as: adopt energy-conservation initialization grouping method to carry out initialization and hive off, up to all nodes can both final decision oneself the role, finally obtain an initial minute group structure that covers the whole network; Afterwards, stable energy-saving group maintenance method adopts the state of node in the periodic polling mode monitoring network to divide group structure to safeguard.When being in polling status, carry out stable energy-saving group maintenance method, form new branch group structure or keep former minute group structure; Between adjacent twice poll, network topology monitors automatically, and the structural change of hiving off is surveyed, if the structural change of hiving off, can call the corresponding processing program topology update of hiving off according to the different event type.Above-mentioned real time monitoring and periodic maintenance process can effectively guarantee to hive off stability of structure under high-speed mobile environment, guarantee that simultaneously node takes on the fairness of cluster, thereby balanced energy consumption prolongs the network bulk life time.The concrete processing procedure of above-mentioned energy-conservation initialization grouping method and stable energy-saving group maintenance method is introduced in front in detail, repeats no more here.

It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.

Claims

1. stabilizing energy-saving grouping method wherein, comprises step:

Step 10, setting group first inquire clock;

Step 20, startup poll clock;

Step 70, cluster are selected both candidate nodes, and both candidate nodes monitors cluster state, execution in step 20.

2. stabilizing energy-saving grouping method as claimed in claim 1, wherein, the selection weights of node are W in the described step 40 _i=w ₁S _i+ w ₂P _i+ w ₃R _i,

3. stabilizing energy-saving grouping method as claimed in claim 1, wherein, described step 70 is specially:

Step 74, both candidate nodes send apply for information to cluster;

4. as claim 1 or 3 described stabilizing energy-saving grouping methods, wherein, in the described step 30, when judging that the poll clock is not overtime, execution in step:

5. stabilizing energy-saving grouping method as claimed in claim 4 wherein, calls the corresponding processing program topology update of hiving off and comprises that node add to handle in the described step 33, be specially:

Steps A 1, new node join in the network;

Steps A 2, new node are alternately monitored all channels in the network;

6. stabilizing energy-saving grouping method as claimed in claim 4, wherein, call the corresponding processing program topology update of hiving off and comprise that node withdraws from processing, is specially in the described step 33:

7. stabilizing energy-saving grouping method as claimed in claim 4 wherein, calls the corresponding processing program topology update of hiving off and comprises the cluster processing of meeting in the described step 33, be specially:

Step C1, the kinetic network topology change of node are met two clusters;

Step C3, two groups merge, and form new group;

Step C4, branch group structure remain unchanged.

8. stabilizing energy-saving grouping method as claimed in claim 4 wherein, calls the corresponding processing program topology update of hiving off and comprises that member node breaks away from cluster and handles in the described step 33, be specially:

Step D2, described member node are monitored the used channel of other groups;

Step D6, former cluster this member node of deletion from its member's tabulation, member node breaks away from cluster and disposes.

9. stabilizing energy-saving grouping method as claimed in claim 4 wherein, calls the corresponding processing program topology update of hiving off and comprises the member node crash handling in the described step 33, be specially:

Step e 2, cluster send apply for information to member node;

Step e 4, keep former minute group structure constant, node failure disposes;

10. as the arbitrary described stabilizing energy-saving grouping method of claim 1～9, wherein, also comprise network carried out the step that initialization is hived off, be specially: