CN102821394A - Channel allocation method and device in wireless mesh network - Google Patents

Abstract

The invention discloses a channel allocation method in a wireless mesh network. The method comprises the steps of pre-allocates a channel assembly for a divided mesh cell; and according to the channel assembly, constructing a time slot subgraph for the mesh cell and allocates channels in the channel assembly to relevant links of the mesh cell according to the time slot subgraph. The invention also provides a channel allocation device in the wireless mesh network. The device comprises a pre-allocating module which is used for pre-allocating the channel assembly for the divided mesh cell and an allocating module which is used for constructing the time slot subgraph for the mesh cell according to the channel assembly and allocating channels in the channel assembly to relevant links of the mesh cell according to the time slot subgraph. According to the channel allocation method and the device in the wireless mesh network, the utilization rate of wireless channel resources is improved, network interference is reduced, network capacity is improved, and the channel allocating fairness is balanced.

Description

Method for channel allocation in the wireless mesh network and device

Technical field

The present invention relates to communication technical field, specially refer to method for channel allocation and device in a kind of wireless mesh network.

Background technology

The node division that the geographical position is close becomes the mesh sub-district, the node in each mesh sub-district can be directly with adjacent mesh sub-district in the node direct communication, but not the communication between the node of adjacent mesh sub-district then need be transmitted through mesh sub-district node.Become the top layer mesh network of network between the mesh sub-district; And but the interior nodes direct communication of mesh sub-district forms bottom mesh network configuration, in the mesh of this layering network; The method for channel allocation that is adopted at present is to give the mesh sub-district with the channel resource allocation in the network; This distribution method is because it just gives the mesh sub-district with channel allocation, and not specific to the link relevant with the mesh sub-district being carried out channel allocation, makes utilization rate of channel resources lower.

Summary of the invention

Main purpose of the present invention is method for channel allocation and the device that provides in a kind of wireless mesh network, can improve the utilance of radio channel resource, can reduce network interferences simultaneously, improves network capacity, stationary channel distributional equity property.

The method for channel allocation that the present invention proposes in a kind of wireless mesh network comprises:

Be the mesh sub-district preassignment channel set of dividing;

According to said channel set,, the channel allocation in the said channel set is given the relevant link of said mesh sub-district according to said time slot subgraph to mesh sub-district structure time slot subgraph.

Preferably, said mesh sub-district preassignment one channel set for division comprises:

Obtain the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel respectively;

Quantity according to publicly-owned channel is the publicly-owned channel of said mesh cell allocation;

According to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel is mesh cell allocation internal channel.

Preferably, the quantity of available channel in the virtual interface number of mesh sub-district and the network is carried out computing as operational factor, obtain the sum of the required channel in said mesh sub-district;

The inner number of links of Common Chain way and mesh sub-district of said mesh sub-district and neighbours mesh sub-district is carried out computing as operational factor, obtain the quantity of publicly-owned channel.

Preferably, said according to channel set, to mesh sub-district structure time slot subgraph, comprise to the relevant link of said mesh sub-district the channel allocation in the said channel set:

According to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

According to said time slot subgraph, distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give said mesh sub-district inner link.

Preferably, carrying out, distributing publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distributing internal channel to give after the inner link in said mesh sub-district, also comprising according to said time slot subgraph:

Judge between the link that distributes same channel and whether have interference;

In this way, then from said time slot subgraph, delete the interfering link in the link that is assigned to same channel, keep an active link.

The present invention also proposes the channel dividing arrangement in a kind of wireless mesh network, comprising:

The preassignment module is used to the mesh sub-district preassignment channel set of division;

Distribution module is used for according to said channel set, to mesh sub-district structure time slot subgraph, the channel allocation in the said channel set is given the relevant link of said mesh sub-district according to said time slot subgraph.

Preferably, said preassignment module comprises:

Acquiring unit is used for obtaining respectively the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel;

First allocation units, the quantity that is used for according to publicly-owned channel is the publicly-owned channel of said mesh cell allocation;

Second allocation units, being used for according to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel is mesh cell allocation internal channel.

Preferably, said acquiring unit is realized in the following manner:

The quantity of available channel in the virtual interface number of mesh sub-district and the network is carried out computing as operational factor, obtain the sum of the required channel in said mesh sub-district;

The inner number of links of Common Chain way and mesh sub-district of said mesh sub-district and neighbours mesh sub-district is carried out computing as operational factor, obtain the quantity of publicly-owned channel.

Preferably, said distribution module comprises:

Structural unit is used for according to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

Allocation units are used for according to said time slot subgraph, distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give said mesh sub-district inner link.

Preferably, said distribution module also comprises:

Judging unit is used to judge between the link that distributes same channel whether have interference;

Delete cells is used in this way, then from said time slot subgraph, deletes the interfering link in the link that is assigned to same channel, keeps an active link.

Method for channel allocation and device in a kind of wireless mesh network provided by the present invention; Through mesh sub-district preassignment channel set to dividing; At certain slot cycle, adopt the time slot method for channel allocation, the channel allocation in the channel set is given the relevant link of mesh sub-district; Utilize this distribution method; Can improve utilance, the minimizing network interferences of radio channel resource, and can guarantee reasonable distribution and the utilization of channel between the relevant link of mesh sub-district, to improve the fairness of channel allocation.

Description of drawings

Fig. 1 is the schematic flow sheet of method for channel allocation one embodiment in the wireless mesh network of the present invention;

Fig. 2 is preallocated schematic flow sheet among method for channel allocation one embodiment in the wireless mesh network of the present invention;

The schematic flow sheet of Fig. 3 for distributing among method for channel allocation one embodiment in the wireless mesh network of the present invention;

Fig. 4 is the schematic flow sheet of the another embodiment of method for channel allocation in the wireless mesh network of the present invention;

Fig. 5 is the structural representation of channel dividing arrangement one embodiment in the wireless mesh network of the present invention;

Fig. 6 is the structural representation of preassignment module among channel dividing arrangement one embodiment in the wireless mesh network of the present invention;

Fig. 7 is the structural representation of distribution module among channel dividing arrangement one embodiment in the wireless mesh network of the present invention;

Fig. 8 is the structural representation of the another embodiment of channel dividing arrangement in the wireless mesh network of the present invention.

The realization of the object of the invention, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.

Embodiment

Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

With reference to Fig. 1, method for channel allocation one embodiment in a kind of wireless mesh network of the present invention is proposed, this method comprises:

Step 101 is the mesh sub-district preassignment channel set of dividing;

In the mesh network configuration of plane; The node division that the geographical position is close becomes the mesh sub-district; All nodes in the mesh sub-district can be directly with adjacent mesh sub-district in the node direct communication, be the top layer mesh network configuration of network between the mesh sub-district, be bottom mesh network configuration between the interior nodes of mesh sub-district; Like this, just, formed the mesh network configuration of layering.

In the mesh of layering network configuration; With the mesh sub-district is unit; Adopt preallocated scheme; Be channel set of mesh sub-district preassignment of dividing in advance, with always the transmitting-receiving number of ports is definite, how much confirmed by the related link in mesh minizone by the common signal channel number that neighbours mesh minizone is distributed by this mesh sub-district actual node number for the channel number that this mesh sub-district is distributed.

Step 102 according to said channel set, to mesh sub-district structure time slot subgraph, is given the channel allocation in the said channel set according to said time slot subgraph the relevant link of said mesh sub-district.

On channel preassignment basis, available channel resources in the network is carried out further dynamic assignment.In certain slot cycle; According to the channel set that is distributed for the mesh sub-district; Layering mesh topology of networks is decomposed into a plurality of time slot subgraphs, and the channel allocation in the channel set that each time slot is pre-assigned to the mesh sub-district is given concrete link in the time slot subgraph.

Method for channel allocation in a kind of wireless mesh network provided by the present invention is through the mesh sub-district preassignment channel set to dividing, at certain slot cycle; Adopt the time slot method for channel allocation; With the relevant link of the channel allocation in the channel set to the mesh sub-district, utilize this distribution method, can improve utilance, the minimizing network interferences of radio channel resource; And can guarantee reasonable distribution and the utilization of channel between the relevant link of mesh sub-district, to improve the fairness of channel allocation.

With reference to Fig. 2, among method for channel allocation one embodiment in a kind of wireless mesh network of the present invention, step 101 comprises:

Step 1011 is obtained the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel respectively;

In this step, can be through the method for computing, obtain the quantity of publicly-owned channel of sum and the mesh sub-district and the neighbours mesh sub-district of the required channel in mesh sub-district.

In the present embodiment, (wherein V representes N mesh set of cells to layering mesh network connection layout for V, E) expression, and E representes the all-network link set, definition mesh sub-district v with undirected multigraph G _i, i=1,2 ..., N, mesh sub-district v _iThe node number that comprises is n (v _i), each node Transmit-Receive Unit number of ports is r (j) in the mesh sub-district, r (j)>=1, and j=1,2 ..., n (v _i), mesh sub-district v _iVirtual interface count R (v _i)=∑ _{J ∈ V (i)}R (j)>=n (v _i), set of available channels is K={1 in the network, 2 ..., F}, | K|=F, like this, for mesh sub-district v _i, be operational factor with number of channels available in its virtual interface number and the network, confirm this mesh sub-district v _iAding up to of required channel

$\left|C\left(v_i\right)\right|=\frac{R\left(v_i\right)}{\underset{1\≤i\≤N}{\mathrm{\Σ}}R\left(v_i\right)}+\mathrm{\α}$

Wherein, α ∈ Z ⁺{0}, expression mesh sub-district is because the channel of the multiplexing increase of channel space.

Mesh sub-district v _iInner number of links l (v _i) be at most (n (v _i) * (n (v _i)-1))/2, but since the also direct communication of neighbours mesh minizone, definition V _c={ v _j, v _j∈ V} is mesh sub-district v _iNeighbours mesh set of cells,

J=1,2 ..., t, t≤| V|, then mesh sub-district v _iWith the Common Chain way of its neighbours mesh sub-district do at most

Mesh sub-district v like this _iRelated link add up to

For mesh sub-district v _i, with this mesh sub-district v _iWith the inner number of links in the Common Chain way of neighbours mesh sub-district and mesh sub-district as operational factor, confirm this mesh sub-district v _iPublicly-owned channel quantity be:

$C(v_i,v_j)=\frac{L\left(v_i{v}_j\right)\×\left|C\left(v_i\right)\right|}{\underset{v_m\∈\mathrm{Vc}}{\mathrm{\Σ}}L\left(v_i{v}_m\right)+l\left(v_i\right)}\∀v_i\∈V,v_j\∈V,v_i\≠v_j.$

Step 1012 is the publicly-owned channel of said mesh cell allocation according to the quantity of publicly-owned channel;

Definition mesh sub-district v _iThe common signal channel of the distribution between ∈ V and its all neighbor nodes adds up to Definition adjacency matrix M={e _Ij: the adjacency matrix of e ∈ E} presentation graphs G, the connection situation of each corresponding mesh sub-district of row of this matrix.e _Ij=1 expression node i and j are neighbor node, and e _Ij=e _Ji, in particular cases during i=j, e _Ii=0.Define simultaneously between the neighbours mesh sub-district except that common signal channel, the set of the channel of the non-common signal channel of all the other distribution forbidding is T ₁, but not the distance between the neighbours mesh sub-district is less than with multiplex distance frequently the time, its frequency forbidding set is T ₂, and

Be input as in the network set of available channels K, the virtual interface of algorithm are counted R (v _i), mesh sub-district v _iNumber of links L (v with its neighbours mesh cell association _iv _j), adjacency matrix M and channel forbidding set T ₁With frequency forbidding set T ₂, be output as mesh sub-district v _iChannel set C (the v that is assigned to _i).

According to the mesh sub-district v that calculates gained _iCommon signal channel sum d _s(v _i), be mesh sub-district v _iThe channel that distributes this quantity.Its allocation rule will guarantee mesh sub-district v _iArrive publicly-owned channel with its neighbours mesh cell allocation, non-neighbours mesh can not distribute identical channel set in the minizone in certain co-channel multiplexing leaving, and the difference of the interchannel of its distribution does not drop on frequency forbidding set T ₂In, otherwise, then use greedy optimized Algorithm to disturb minimum channel in the currently used channel for it distributes.

Step 1013 is a mesh cell allocation internal channel according to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel.

According to mesh sub-district v _iThe sum of required channel | C (v _i) | with the quantity d of publicly-owned channel _s(v _i), be mesh sub-district v _iDistribute (| C (v _i) |-d _s(v _i)) channel of quantity, to satisfy mesh sub-district v _iInner channel demands.The channel allocation rule is that mesh sub-district channel difference inner and that the mesh minizone is assigned to does not drop on channel forbidding set T ₁In, non-neighbours mesh cell allocation to the channel difference can not drop on frequency forbidding set T ₂In.

Through calculating the required total number of channels in mesh sub-district and the publicly-owned channel quantity of mesh sub-district and neighbours mesh sub-district; For the mesh cell allocation is used for the publicly-owned channel with neighbours mesh cell communication; The quantity that deducts publicly-owned channel with the required total number of channels in mesh sub-district again obtains the internal channel number of mesh sub-district; Be the channel of this quantity of mesh cell allocation, both can have guaranteed the connectedness of mesh sub-district and neighbours mesh minizone network, can guarantee the communication that the mesh sub-district is inner again.

With reference to Fig. 3, among method for channel allocation one embodiment in a kind of wireless mesh network of the present invention, step 102 comprises:

Step 1021 is according to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

Mesh sub-district v _iWith its neighbours mesh sub-district v _jPublicly-owned channel number do

The set of mesh cell channel is C (v _i).Definition time slot subgraph H _τ(V _τ, E _τ), satisfy H _τ∈ G, 1≤τ≤T.Definition time slot channel allocation matrix

As mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween multilink distributed channel k, or v _i=v _jUnder the situation during the inner link assignment channel k in mesh sub-district,

Every link of same time slot can only distribute a channel, so link (v _i, v _j) satisfied constraint:

$\underset{k\∈K}{\mathrm{\Σ}}{C}_{\mathrm{vi},\mathrm{vj}}^k\≤1\∀(v_i,v_j)\∈E_{\mathrm{\τ}},H_{\mathrm{\τ}}\∈G$

When carrying out the time slot channel allocation, same time slot mesh sub-district v _iThe number of channel that related limit is distributed can not be more than the number of channel that comprises in its channel set and its virtual interface number.

Definition time slot virtual interface channel uses matrix

As mesh sub-district v _iCertain interface when using channel k Same time slot mesh sub-district v of while _iThe number of channel of using will satisfy following constraint:

$\underset{k\∈K}{\mathrm{\Σ}}{X}_{\mathrm{vi}}^k\≤C\left(v_i\right)\≤R\left(v_i\right)\∀v_i\∈V_{\mathrm{\τ}},H_{\mathrm{\τ}}\∈G$

In addition, for mesh sub-district v _i, L (v is counted on its related limit _i) be greater than mesh sub-district virtual interface usually and count R (v _i):

$R\left(v_i\right)\≤L\left(v_i\right)\≤(n\left(v_i\right)\×(n\left(v_i\right)-1))/2+\underset{\mathrm{vj}\∈\mathrm{Vc}}{\mathrm{\Σ}}n\left(v_i\right)\×n\left(v_j\right)$

According to mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween the common signal channel number | C (v _iv _j) |, the common edge of structure time slot subgraph neighbor node is because mesh sub-district v _iInner number of available channels does

Same structure mesh sub-district v _iThe internal chain way.Can construct the first time slot subgraph that comprises all nodes like this

Wherein, V wherein ₁=V,

Step 1022 according to said time slot subgraph, distributes publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distributes internal channel to give said mesh sub-district inner link.

Algorithm be input as network connection layout G=(V, E), mesh sub-district v _iSet of available channels C (v _i), virtual interface counts R (v _i) and mesh sub-district v _iL (v is counted on related limit _i), be output as the subgraph H of each time slot _τAnd corresponding channel allocation situation.

The subgraph H that the time slot of being constructed is generated ₁(V ₁, E ₁) carry out channel allocation.From C (v _iv _j) in choose channel allocation and give mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween all related links, and from channel set

In choose channel allocation and give mesh sub-district v _iInner link.

Publicly-owned channel and internal channel according to the mesh sub-district; Structure time slot subgraph in the cycle; Give the concrete link in the time slot subgraph with publicly-owned channel set and the concentrated channel allocation of internal channel; Can guarantee in each time slot, to give link as much as possible channel resource allocation, further improve channel resource utilance and network capacity.

With reference to Fig. 4, the another embodiment of method for channel allocation in a kind of wireless mesh network of the present invention is proposed, step 102 also comprises:

Step 1023 judges between the link that distributes same channel whether have interference;

Judge time slot subgraph H ₁In distributed between the link of same channel whether have interference, as not existing, think that then it is feasible that the time slot link channel distributes.

Step 1024 in this way, is then deleted the interfering link in the link that is assigned to same channel from said time slot subgraph, keep an active link.

In the present embodiment; For arbitrary link e of subgraph, definition

is the interference edge collection of limit e when the time slot channel allocation.Definition link (e _i, k) with (e _j, be that two links of phase mutual interference are right k), e wherein _j∈ I (e _i) and e _i∈ I (e _j), 1≤k≤F.

As judge to exist between the link that has distributed same channel and disturb, then with these two link (e _i, k) with (e _j, arbitrary interfering link in k) deleted from the time slot subgraph, only keeps a limited link.

In the present embodiment, to H ₁After the subgraph channel allocation, with H ₁(V, E) deletion can obtain new network connection layout G from original multiple connection layout G= ₁(V, E), i.e. G ₁=G-H ₁

To new connection layout G ₁At the new time slot subgraph of next time slot τ structure V wherein _τ=V,

1≤τ≤T is then to time slot subgraph H _τCarry out channel allocation, the connection layout that behind process T time slot, obtains

Algorithm is ended, and obtains the union of all time slot subgraphs $\underset{\mathrm{\τ}=1}{\overset{T}{\mathrm{\Σ}}}(\∪H_{\mathrm{\τ}}(V_{\mathrm{\τ}},E_{\mathrm{\τ}}))\⊇G(V,E).$

With reference to Fig. 5, channel dividing arrangement one embodiment in a kind of wireless mesh network of the present invention is proposed, this device comprises:

Preassignment module 10 is used to the mesh sub-district preassignment channel set of division;

Distribution module 20 is used for according to said channel set, to mesh sub-district structure time slot subgraph, the channel allocation in the said channel set is given the relevant link of said mesh sub-district according to said time slot subgraph.

In the mesh network configuration of plane; The node division that the geographical position is close becomes the mesh sub-district; All nodes in the mesh sub-district can be directly with adjacent mesh sub-district in the node direct communication, be the top layer mesh network configuration of network between the mesh sub-district, be bottom mesh network configuration between the interior nodes of mesh sub-district; Like this, just, formed the mesh network configuration of layering.

In the mesh of layering network configuration; With the mesh sub-district is unit; Adopt preallocated scheme; Preassignment module 10 is channel set of mesh sub-district preassignment of dividing in advance, and with always the transmitting-receiving number of ports is definite, how much confirmed by the related link in mesh minizone by the common signal channel number that neighbours mesh minizone is distributed by this mesh sub-district actual node number for the channel number that this mesh sub-district is distributed.

On channel preassignment basis, available channel resources in the network is carried out further dynamic assignment.In certain slot cycle; According to the channel set that is distributed for the mesh sub-district; Layering mesh topology of networks is decomposed into a plurality of time slot subgraphs, and the channel allocation of distribution module 20 in the channel set that each time slot is pre-assigned to the mesh sub-district given concrete link in the time slot subgraph.

Channel dividing arrangement in a kind of wireless mesh network provided by the present invention is through the mesh sub-district preassignment channel set to dividing, at certain slot cycle; Adopt the time slot method for channel allocation; With the relevant link of the channel allocation in the channel set to the mesh sub-district, utilize this distribution method, can improve utilance, the minimizing network interferences of radio channel resource; And can guarantee reasonable distribution and the utilization of channel between the relevant link of mesh sub-district, to improve the fairness of channel allocation.

With reference to Fig. 6, among channel dividing arrangement one embodiment in a kind of wireless mesh network of the present invention, preassignment module 10 comprises:

Acquiring unit 11 is used for obtaining respectively the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel;

First allocation units 12, the quantity that is used for according to publicly-owned channel is the publicly-owned channel of said mesh cell allocation;

Second allocation units 13, being used for according to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel is mesh cell allocation internal channel.

In this step, acquiring unit 11 can be through the method for computing, obtains the quantity of publicly-owned channel of sum and the mesh sub-district and the neighbours mesh sub-district of the required channel in mesh sub-district.

In the present embodiment, (wherein V representes N mesh set of cells to layering mesh network connection layout for V, E) expression, and E representes the all-network link set, definition mesh sub-district v with undirected multigraph G _i, i=1,2 ..., N, mesh sub-district v _iThe node number that comprises is n (v _i), each node Transmit-Receive Unit number of ports is r (j) in the mesh sub-district, r (j)>=1, and j=1,2 ..., n (v _i), mesh sub-district v _iVirtual interface count R (v _i)=∑ _{J ∈ V (i)}R (j)>=n (v _i), set of available channels is K={1 in the network, 2 ..., F}, | K|=F, like this, for mesh sub-district v _i, be operational factor with number of channels available in its virtual interface number and the network, confirm this mesh sub-district v _iAding up to of required channel

$\left|C\left(v_i\right)\right|=\frac{R\left(v_i\right)\×F}{\underset{1\≤i\≤N}{\mathrm{\Σ}}R\left(v_i\right)}+\mathrm{\α}$

Wherein, α ∈ Z ⁺{0}, expression mesh sub-district is because the channel of the multiplexing increase of channel space.

Mesh sub-district v _iInner number of links l (v _i) be at most (n (v _i) * (n (v _i)-1))/2, but since the also direct communication of neighbours mesh minizone, definition V _c={ v _j, v _j∈ V} is mesh sub-district v _iNeighbours mesh set of cells,

J=1,2 ..., t, t≤| V|, then mesh sub-district v _iWith the Common Chain way of its neighbours mesh sub-district do at most

Mesh sub-district v like this _iRelated link add up to

For mesh sub-district v _i, with this mesh sub-district v _iWith the inner number of links in the Common Chain way of neighbours mesh sub-district and mesh sub-district as operational factor, confirm this mesh sub-district v _iPublicly-owned channel quantity be:

$C\left(v_i{v}_j\right)=\frac{L\left(v_i{v}_j\right)\×\left|C\left(v_i\right)\right|}{\underset{v_m\∈\mathrm{Vc}}{\mathrm{\Σ}}L\left(v_i{v}_m\right)+l\left(v_i\right)}\∀v_i\∈V,v_j\∈V,v_i\≠v_j.$

Definition mesh sub-district v _iThe common signal channel of the distribution between ∈ V and its all neighbor nodes adds up to

Satisfy d _s(v _i)≤| C (v _i) |.Definition adjacency matrix M={e _Ij: the adjacency matrix of e ∈ E} presentation graphs G, the connection situation of each corresponding mesh sub-district of row of this matrix.e _Ij=1 expression node i and j are neighbor node, and e _Ij=e _Ji, in particular cases during i=j, e _Ii=0.Define simultaneously between the neighbours mesh sub-district except that common signal channel, the set of the channel of the non-common signal channel of all the other distribution forbidding is T ₁, but not the distance between the neighbours mesh sub-district is less than with multiplex distance frequently the time, its frequency forbidding set is T ₂, and

Be input as in the network set of available channels K, the virtual interface of algorithm are counted R (v _i), mesh sub-district v _iNumber of links L (v with its neighbours mesh cell association _iv _j), adjacency matrix M and channel forbidding set T ₁With frequency forbidding set T ₂, be output as mesh sub-district v _iChannel set C (the v that is assigned to _i).

First allocation units 12 are according to the mesh sub-district v that calculates gained _iCommon signal channel sum d _s(v _i), be mesh sub-district v _iThe channel that distributes this quantity.Its allocation rule will guarantee mesh sub-district v _iArrive publicly-owned channel with its neighbours mesh cell allocation, non-neighbours mesh can not distribute identical channel set in the minizone in certain co-channel multiplexing leaving, and the difference of the interchannel of its distribution does not drop on frequency forbidding set T ₂In, otherwise, then use greedy optimized Algorithm to disturb minimum channel in the currently used channel for it distributes.

According to mesh sub-district v _iThe sum of required channel | C (v _i) | with the quantity d of publicly-owned channel _s(v _i), be mesh sub-district v _iDistribute (| C (v _i) |-d _s(v _i)) channel of quantity, to satisfy mesh sub-district v _iInner channel demands.The channel allocation rule is that mesh sub-district channel difference inner and that the mesh minizone is assigned to does not drop on channel forbidding set T ₁In, non-neighbours mesh cell allocation to the channel difference can not drop on frequency forbidding set T ₂In.

Through calculating the required total number of channels in mesh sub-district and the publicly-owned channel quantity of mesh sub-district and neighbours mesh sub-district; Second allocation units 13 are used for the publicly-owned channel with neighbours mesh cell communication for the mesh cell allocation; The quantity that deducts publicly-owned channel with the required total number of channels in mesh sub-district again obtains the internal channel number of mesh sub-district; Be the channel of this quantity of mesh cell allocation, both can have guaranteed the connectedness of mesh sub-district and neighbours mesh minizone network, can guarantee the communication that the mesh sub-district is inner again.

With reference to Fig. 7, among channel dividing arrangement one embodiment in a kind of wireless mesh network of the present invention, distribution module 20 comprises:

Structural unit 21 is used for according to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

Allocation units 22 are used for according to said time slot subgraph, distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give said mesh sub-district inner link.

Mesh sub-district v _iWith its neighbours mesh sub-district v _jPublicly-owned channel set number do

The set of mesh cell channel is C (v _i).Definition time slot subgraph H _τ(V _τ, E _τ), satisfy H _τ∈ G, 1≤τ≤T.Definition time slot channel allocation matrix As mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween multilink distributed channel k, or v _i=v _jUnder the situation during the inner link assignment channel k in mesh sub-district,

Every link of same time slot can only distribute a channel, so link (v _i, v _j) satisfied constraint:

$\underset{k\∈K}{\mathrm{\Σ}}{C}_{\mathrm{vi},\mathrm{vj}}^k\≤1\∀(v_i,v_j)\∈E_{\mathrm{\τ}},H_{\mathrm{\τ}}\∈G$

When carrying out the time slot channel allocation, same time slot mesh sub-district v _iThe number of channel that related limit is distributed can not be more than the number of channel that comprises in its channel set and its virtual interface number.

Definition time slot virtual interface channel uses matrix

As mesh sub-district v _iCertain interface when using channel k

Same time slot mesh sub-district v of while _iThe number of channel of using will satisfy following constraint:

$\underset{k\∈K}{\mathrm{\Σ}}{X}_{\mathrm{vi}}^k\≤C\left(v_i\right)\≤R\left(v_i\right)\∀v_i\∈V_{\mathrm{\τ}},H_{\mathrm{\τ}}\∈G$

In addition, for mesh sub-district v _i, L (v is counted on its related limit _i) be greater than mesh sub-district virtual interface usually and count R (v _i):

$R\left(v_i\right)\≤L\left(v_i\right)\≤(n\left(v_i\right)\×(n\left(v_i\right)-1))/2+\underset{\mathrm{vj}\∈\mathrm{Vc}}{\mathrm{\Σ}}n\left(v_i\right)\×n\left(v_j\right)$

Structural unit 21 is according to mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween the common signal channel number | C (v _iv _j) |, the common edge of structure time slot subgraph neighbor node is because mesh sub-district v _iInner number of available channels does

Same structure mesh sub-district v _iThe internal chain way.Can construct the first time slot subgraph that comprises all nodes like this

Wherein, V wherein ₁=V,

Algorithm be input as network connection layout G=(V, E), mesh sub-district v _iSet of available channels C (v _i), virtual interface counts R (v _i) and mesh sub-district v _iL (v is counted on related limit _i), be output as the subgraph H of each time slot _τAnd corresponding channel allocation situation.

The subgraph H that 22 pairs of time slots of being constructed of allocation units generate ₁(V ₁, E ₁) carry out channel allocation.From C (v _iv _j) in choose channel allocation and give mesh sub-district v _iWith its neighbours mesh sub-district v _jBetween all related links, and from channel set

In choose channel allocation and give mesh sub-district v _iInner link.

Publicly-owned channel and internal channel according to the mesh sub-district; Structure time slot subgraph in the cycle; Give the concrete link in the time slot subgraph with publicly-owned channel set and the concentrated channel allocation of internal channel; Can guarantee in each time slot, to give link as much as possible channel resource allocation, further improve channel resource utilance and network capacity.

With reference to Fig. 8, the another embodiment of the channel dividing arrangement in a kind of wireless mesh network of the present invention is proposed, distribution module 20 also comprises:

Judging unit 23 is used to judge between the link that distributes same channel whether have interference;

Delete cells 24 is used in this way, then from said time slot subgraph, deletes the interfering link in the link that is assigned to same channel, keeps an active link.

Judging unit 23 is judged time slot subgraph H ₁In distributed between the link of same channel whether have interference, as not existing, think that then it is feasible that the time slot link channel distributes.

In the present embodiment; For arbitrary link e of subgraph, definition

is the interference edge collection of limit e when the time slot channel allocation.Definition link (e _i, k) with (e _j, be that two links of phase mutual interference are right k), e wherein _j∈ I (e _i) and e _i∈ I (e _j), 1≤k≤F.

As judge to exist between the link that has distributed same channel and disturb, then with these two link (e _i, k) with (e _j, arbitrary interfering link in k) deleted from the time slot subgraph, only keeps a limited link.

In the present embodiment, to H ₁After the subgraph channel allocation, with H ₁(V, E) deletion can obtain new network connection layout G from original multiple connection layout G= ₁(V, E), i.e. G ₁=G-H ₁

To new connection layout G ₁At the new time slot subgraph of next time slot τ structure

V wherein _τ=V,

1≤τ≤T is then to time slot subgraph H _τCarry out channel allocation, the connection layout that behind process T time slot, obtains

Algorithm is ended, and obtains the union of all time slot subgraphs $\underset{\mathrm{\τ}=1}{\overset{T}{\mathrm{\Σ}}}(\∪H_{\mathrm{\τ}}(V_{\mathrm{\τ}},E_{\mathrm{\τ}}))\⊇G(V,E).$

The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.

Claims (10)

1. the method for channel allocation in the wireless mesh network is characterized in that, comprising:

Be the mesh sub-district preassignment channel set of dividing;

According to said channel set,, the channel allocation in the said channel set is given the relevant link of said mesh sub-district according to said time slot subgraph to mesh sub-district structure time slot subgraph.

2. the method for channel allocation in the wireless mesh network as claimed in claim 1 is characterized in that, said mesh sub-district preassignment one channel set for division comprises:

Obtain the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel respectively;

Quantity according to publicly-owned channel is the publicly-owned channel of said mesh cell allocation;

According to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel is mesh cell allocation internal channel.

3. the method for channel allocation in the wireless mesh network as claimed in claim 2 is characterized in that,

The quantity of available channel in the virtual interface number of mesh sub-district and the network is carried out computing as operational factor, obtain the sum of the required channel in said mesh sub-district;

The inner number of links of Common Chain way and mesh sub-district of said mesh sub-district and neighbours mesh sub-district is carried out computing as operational factor, obtain the quantity of publicly-owned channel.

4. the method for channel allocation in the wireless mesh network as claimed in claim 3 is characterized in that, and is said according to channel set, to mesh sub-district structure time slot subgraph, comprises to the relevant link of said mesh sub-district the channel allocation in the said channel set:

According to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

According to said time slot subgraph, distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give said mesh sub-district inner link.

5. the method for channel allocation in the wireless mesh network as claimed in claim 4; It is characterized in that; Carrying out according to said time slot subgraph; Distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give after the inner link in said mesh sub-district, also comprise:

Judge between the link that distributes same channel and whether have interference;

In this way, then from said time slot subgraph, delete the interfering link in the link that is assigned to same channel, keep an active link.

6. the channel dividing arrangement in the wireless mesh network is characterized in that, comprising:

The preassignment module is used to the mesh sub-district preassignment channel set of division;

Distribution module is used for according to said channel set, to mesh sub-district structure time slot subgraph, the channel allocation in the said channel set is given the relevant link of said mesh sub-district according to said time slot subgraph.

7. the channel dividing arrangement in the wireless mesh network as claimed in claim 6 is characterized in that, said preassignment module comprises:

Acquiring unit is used for obtaining respectively the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel;

First allocation units, the quantity that is used for according to publicly-owned channel is the publicly-owned channel of said mesh cell allocation;

Second allocation units, being used for according to the sum of the required channel in mesh sub-district and the quantity of publicly-owned channel is mesh cell allocation internal channel.

8. the channel dividing arrangement in the wireless mesh network as claimed in claim 7 is characterized in that, said acquiring unit is realized in the following manner:

The quantity of available channel in the virtual interface number of mesh sub-district and the network is carried out computing as operational factor, obtain the sum of the required channel in said mesh sub-district;

The inner number of links of Common Chain way and mesh sub-district of said mesh sub-district and neighbours mesh sub-district is carried out computing as operational factor, obtain the quantity of publicly-owned channel.

9. the channel dividing arrangement in the wireless mesh network as claimed in claim 8 is characterized in that said distribution module comprises:

Structural unit is used for according to publicly-owned channel in said mesh sub-district and internal channel, at each time slot structure time slot subgraph; Said time slot subgraph comprises the inner link of common link and mesh sub-district of said mesh sub-district and neighbours mesh sub-district;

Allocation units are used for according to said time slot subgraph, distribute publicly-owned channel to give the common link of said mesh sub-district and neighbours mesh sub-district, distribute internal channel to give said mesh sub-district inner link.

10. the channel dividing arrangement in the wireless mesh network as claimed in claim 9 is characterized in that said distribution module also comprises:

Judging unit is used to judge between the link that distributes same channel whether have interference;

Delete cells is used in this way, then from said time slot subgraph, deletes the interfering link in the link that is assigned to same channel, keeps an active link.

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