CN102821394B - Method for channel allocation in wireless mesh network and device - Google Patents

Abstract

Present invention is disclosed the method for channel allocation in a kind of wireless mesh network, including: for the mesh community predistribution channel set divided；According to described channel set, mesh community is constructed time slot subgraph, according to described time slot subgraph, the channel in described channel set is distributed to the relevant link of described mesh community.The present invention also provides for the channel dividing arrangement in a kind of wireless mesh network, including: forward allocator module, for the mesh community predistribution channel set for dividing；Distribution module, for according to described channel set, constructing time slot subgraph to mesh community, the channel in described channel set distributed to according to described time slot subgraph the relevant link of described mesh community.Method for channel allocation in a kind of wireless mesh network that the present invention provides and device, can improve the utilization rate of radio channel resource, reduces network interferences, and raising network capacity also can stationary channel fairness in distribution.

Description

Method for channel allocation in wireless mesh network and device

Technical field

The present invention relates to communication technical field, be related specifically to the method for channel allocation in a kind of wireless mesh network and Device.

Background technology

Node division close for geographical position becomes mesh community, and the node in each mesh community can be directly with adjacent Node in mesh community directly communicates, and the communication between the node of non-adjacent mesh community then needs to be saved by mesh community Point forwards.Become the top layer mesh network of network between mesh community, and mesh community interior nodes can directly communicate, form bottom Mesh network structure, in the mesh network of this layering, currently used method for channel allocation is by the channel in network Resource distributes to mesh community, and this distribution method is that channel is distributed to mesh community due to it, and not specific to right The link relevant to mesh community carries out channel distribution so that the utilization rate of channel resource is relatively low.

Summary of the invention

The main object of the present invention, for providing the method for channel allocation in a kind of wireless mesh network and device, can improve The utilization rate of radio channel resource, can reduce network interferences simultaneously, improves network capacity, stationary channel distributional equity.

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

For the mesh community predistribution channel set divided；

According to described channel set, mesh community is constructed time slot subgraph, according to described time slot subgraph by described channel set Channel in conjunction distributes to the relevant link of described mesh community.

Preferably, described mesh community predistribution one channel set for dividing includes:

The quantity of the total and publicly-owned channel of channel needed for acquisition mesh community respectively；

Quantity according to publicly-owned channel is that publicly-owned channel is distributed in described mesh community；

It is that internal channel is distributed in mesh community according to the quantity of the total and publicly-owned channel of channel needed for mesh community.

Preferably, the quantity of available channel in the virtual interface number of mesh community and network is transported as operational factor Calculate, obtain the sum of channel needed for described mesh community；

Using the number of links of described mesh community and the common link number of neighbours mesh community and mesh Intra-cell as fortune Calculate the factor and carry out computing, obtain the quantity of publicly-owned channel.

Preferably, described according to channel set, mesh community is constructed time slot subgraph, by the channel in described channel set The relevant link distributing to described mesh community includes:

According to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot subgraph；Described time slot Figure includes described mesh community and the common link of neighbours mesh community and the link of mesh Intra-cell；

According to described time slot subgraph, distribute the publicly-owned channel common link to described mesh community with neighbours mesh community, Distribution internal channel gives the link of described mesh Intra-cell.

Preferably, performing according to described time slot subgraph, distributing publicly-owned channel little with neighbours mesh to described mesh community The common link in district, after distribution internal channel gives the link of described mesh Intra-cell, also includes:

Judge to distribute and whether there is interference between the link of same channel；

In this way, then from described time slot subgraph, delete the interfering link in the link being assigned to same channel, retain one Bar active link.

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

Forward allocator module, for the mesh community predistribution channel set for dividing；

Distribution module, for according to described channel set, constructing time slot subgraph to mesh community, according to described time slot subgraph Channel in described channel set is distributed to the relevant link of described mesh community.

Preferably, described forward allocator module includes:

Acquiring unit, the quantity of the total and publicly-owned channel of channel needed for obtaining mesh community respectively；

First allocation unit, being used for according to the quantity of publicly-owned channel is that publicly-owned channel is distributed in described mesh community；

Second allocation unit, being used for according to the quantity of the total and publicly-owned channel of channel needed for mesh community is mesh community Distribution internal channel.

Preferably, described acquiring unit is accomplished by:

The quantity of available channel in the virtual interface number of mesh community and network is carried out computing as operational factor, obtains The sum of channel needed for described mesh community；

Using the number of links of described mesh community and the common link number of neighbours mesh community and mesh Intra-cell as fortune Calculate the factor and carry out computing, obtain the quantity of publicly-owned channel.

Preferably, described distribution module includes:

Structural unit, for according to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot Figure；Described time slot subgraph includes described mesh community and the common link of neighbours mesh community and the link of mesh Intra-cell；

Allocation unit, for according to described time slot subgraph, distributes publicly-owned channel little with neighbours mesh to described mesh community The common link in district, distribution internal channel gives the link of described mesh Intra-cell.

Preferably, described distribution module also includes:

Whether judging unit, exist interference between the link judging to distribute same channel；

Delete unit, in this way, then from described time slot subgraph, delete doing in the link being assigned to same channel Disturb link, retain an active link.

Method for channel allocation in a kind of wireless mesh network provided by the present invention and device, by the mesh divided Community predistribution channel set, at certain slot cycle, uses non-slotted channel distribution method, is divided by the channel in channel set The relevant link of dispensing mesh community, utilizes this distribution method, can improve the utilization rate of radio channel resource, reduce network Interference, and can guarantee that channel reasonable distribution between the relevant link of mesh community and utilization, to improve channel distributional equity Property.

Accompanying drawing explanation

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

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

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

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

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

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

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

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

The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further referring to the drawings.

Detailed description of the invention

Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit 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, the method bag are proposed Include:

Step 101, for the mesh community predistribution channel set divided；

In plane mesh network structure, node division close for geographical position is become mesh community, in mesh community All nodes can directly directly communicate with the node in adjacent mesh community, is the top layer mesh net of network between mesh community Network structure, is bottom mesh network structure between the interior nodes of mesh community, so, just defines the mesh network structure of layering.

In the mesh network structure of layering, in units of mesh community, use preallocated scheme, for divide in advance One channel set of mesh community predistribution, the channel number that this mesh community is distributed is by this mesh community actual node number Determining with total transceiver interface number, the link that the common signal channel number of neighbours mesh minizone distribution is associated by mesh minizone is how many Determine.

Step 102, according to described channel set, constructs time slot subgraph to mesh community, according to described time slot subgraph by institute State the channel in channel set and distribute to the relevant link of described mesh community.

On the basis of channel predistribution, available channel resources in network is carried out the most dynamically distribution.When certain In the gap cycle, according to the channel set distributed by mesh community, when layering mesh topology of networks is decomposed into multiple Gap subgraph, the channel in the channel set that each time slot is pre-assigned to mesh community is distributed in time slot subgraph concrete Link.

Method for channel allocation in a kind of wireless mesh network provided by the present invention, by pre-to the mesh community divided Distribution channel set, at certain slot cycle, uses non-slotted channel distribution method, is distributed to by the channel in channel set The relevant link of mesh community, utilizes this distribution method, can improve radio channel resource utilization rate, reduce network do Disturb, and can guarantee that channel reasonable distribution between the relevant link of mesh community and utilization, to improve channel distributional equity Property.

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

Step 1011, the respectively quantity of the total and publicly-owned channel of channel needed for acquisition mesh community；

In this step, the sum of channel needed for mesh community and mesh community by the method for computing, can be obtained with adjacent Occupy the quantity of the publicly-owned channel of mesh community.

In the present embodiment, layering mesh network connects figure and represents with undirected multigraph G (V, E), and wherein V represents N number of mesh Set of cells, E represents all-network link set, defines mesh community v_i, i=1,2 ..., N, mesh community v_iThe joint comprised Count as n (v_i), in mesh community, each node Transmit-Receive Unit number of ports is r (j), r (j) >=1, j=1,2 ..., n (v_i), Mesh community v_iVirtual interface number R (v_i)=∑_j∈V(i)r(j)≥n(v_i), in network, set of available channels is K={1, 2 ..., F}, | K |=F, so, for mesh community v_i, in its virtual interface number and network, number of channels available is as computing The factor, determines this mesh community v_iThe sum of required channel is

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

Wherein, α ∈ Z⁺{ 0} represents the channel that increases due to channel space multiplexing of mesh community.

Mesh community v_iInternal number of links l (v_i) up to (n (v_i)×(n(v_i)-1))/2, due to neighbours mesh community Between also can directly communicate, define V_c={ v_j, v_j∈ V} is mesh community v_iNeighbours' mesh set of cells,J=1, 2 ..., t, t≤| V |, then mesh community v_iIt is up to the common link number of its neighbours mesh communityThis Sample mesh community v_iAssociated link sum isLittle for mesh District v_i, with this mesh community v_iWith the common link number of neighbours mesh community and the number of links of mesh Intra-cell as computing because of Son, determines this mesh community 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 that publicly-owned channel is distributed in described mesh community according to the quantity of publicly-owned channel；

Definition mesh community v_iThe common signal channel sum of the distribution between ∈ V and its all neighbor nodes isDefinition adjacency matrix M={e_ij: e ∈ E} represents the adjacent square of figure G Battle array, the connection of the corresponding mesh community of every a line of this matrix.e_ij=1 represents that node i and j are neighbor node, and e_ij=e_ji, in particular cases during i=j, e_ii=0.Simultaneously between definition neighbours mesh community in addition to common signal channel, remaining distribution Not common channel channel disabling collection be combined into T₁, rather than when the distance between neighbours mesh community is less than frequency reuse distance, Its frequency disabling collection is combined into T₂, andThe input of algorithm is set of available channels K in network, virtual interface number R (v_i), mesh community v_iNumber of links L (v with its neighbours' mesh cell association_iv_j), adjacency matrix M and channel disabling set T₁ With frequency disabling set T₂, it is output as mesh community v_iChannel set C (the v being assigned to_i)。

According to the mesh community v calculating gained_iCommon signal channel sum d_s(v_i), for mesh community v_iDistribute this quantity Channel.Its allocation rule mesh to be ensured community v_iIt is assigned to publicly-owned channel, certain co-channel with its neighbours mesh community Multiplexing can not distribute identical channel set from interior non-neighbours mesh minizone, and the difference of the interchannel of its distribution does not falls Frequency disabling set T₂In, otherwise, then using greedy optimization algorithm is that it distributes the channel disturbing minimum in currently used channel.

Step 1013, is that the distribution of mesh community is internal according to the quantity of the total and publicly-owned channel of channel needed for mesh community Channel.

According to mesh community v_iThe sum of required channel | C (v_i) | and quantity d of publicly-owned channel_s(v_i), for mesh community v_iDistribution (| C (v_i)|-d_s(v_i)) channel of quantity, to meet mesh community v_iInternal channel demands.Channel allocation rule is The channel differences that mesh Intra-cell and mesh minizone are assigned to not to fall at channel disabling set T₁In, non-neighbours mesh community The channel differences being assigned to can not fall at frequency disabling set T₂In.

By calculating the publicly-owned channel quantity of the total number of channels needed for mesh community and mesh community and neighbours mesh community, For the distribution of mesh community for the publicly-owned channel with neighbours' mesh cell communication, then deduct by the total number of channels needed for mesh community The quantity of publicly-owned channel obtains the internal channel number of mesh community, distributes the channel of this quantity for mesh community, both can ensure Mesh community and the connectedness of neighbours mesh minizone network, ensure that the communication of mesh Intra-cell.

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

Step 1021, according to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot subgraph；Institute State time slot subgraph and include described mesh community and the common link of neighbours mesh community and the link of mesh Intra-cell；

Mesh community v_iWith its neighbours mesh community v_jPublicly-owned channel number beMesh community Channel set is C (v_i).Definition time slot subgraph H_τ(V_τ, E_τ), meet H_τ∈ G, 1≤τ≤T.Definition non-slotted channel allocation matrixAs mesh community v_iWith its neighbours mesh community v_jBetween multilink be assigned with letter Road k, or v_i=v_jIn the case of mesh Intra-cell link distribution channel k time,Same time slot each of the links can only be divided Join channel, therefore a 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 non-slotted channel distribution, same time slot mesh community v_iThe number of channel of the limit distribution of association can not be more than it The number of channel comprised in channel set and its virtual interface number.

Definition time slot virtual interface channel uses matrixAs mesh community v_iCertain When individual interface uses channel kThe most same time slot mesh community v_iThe number of channel used to meet following constraint:

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

Additionally, for mesh community v_i, the limit number L (v of its association_i) it is typically greater than mesh cell virtual number of ports 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 community v_iWith its neighbours mesh community v_jBetween common signal channel number | C (v_iv_j) |, structure time slot subgraph is adjacent Occupy the common edge of node, due to mesh community v_iInternal number of available channels isIdentically constructed mesh is little District v_iInternal chain way.So can construct the first time slot subgraph comprising all nodesWherein, Wherein V₁=V,

Step 1022, according to described time slot subgraph, distributes publicly-owned channel to described mesh community and neighbours mesh community Common link, distribution internal channel gives the link of described mesh Intra-cell.

The input of algorithm is network connection figure G=(V, E), mesh community v_iSet of available channels C (v_i), virtual interface Number R (v_i) and mesh community v_iThe limit number L (v of association_i), it is output as the subgraph H of each time slot_τAnd the channel distribution feelings of correspondence Condition.

The subgraph H that the time slot constructed is generated₁(V₁, E₁) carry out channel distribution.From C (v_iv_jChoose channel in) and distribute to mesh Community v_iWith its neighbours mesh community v_jBetween all links of association, and from channel set In choose channel and distribute to mesh community v_iInternal link.

Publicly-owned channel according to mesh community and internal channel, construct time slot subgraph within the cycle, by publicly-owned channel set and The channel that internal channel is concentrated distributes to the concrete link in time slot subgraph, it is ensured that in each time slot channel resource allocation To link as much as possible, further increase channel resource utilization rate 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, step 102 are proposed Also include:

Step 1023, it is judged that distribute whether there is interference between the link of same channel；

Judge time slot subgraph H₁In be assigned with between the link of same channel whether there is interference, if do not existed, then it is assumed that time The distribution of gap link channel is feasible.

Step 1024, in this way, then deletes the interference chain in the link being assigned to same channel from described time slot subgraph Road, retains an active link.

In the present embodiment, when non-slotted channel distributes for arbitrary link e of subgraph, definitionDoing for limit e Disturb limit collection.Definition link (e_i, k) with (e_j, k) for the both links pair interfered, wherein e_j∈I(e_i) and e_i∈I(e_j), 1 ≤k≤F。

Interference is there is, then by this both links (e between the link of same channel as judged to be assigned with_i, k) with (e_j, k) in Any bar interfering link delete from time slot subgraph, only retain an active link.

In the present embodiment, to H₁After the distribution of subgraph channel, by H₁Delete from the original figure G=(V, E) that reconnect more, available New network connects figure G₁(V, E), i.e. G₁=G-H₁。

To new connection figure G₁At the time slot subgraph that next time slot τ structure is newWherein V_τ= V,1≤τ≤T, then to time slot subgraph H_τCarry out channel distribution, until the connection figure obtained after T time slotAlgorithm stops, 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, this device bag are proposed Include:

Forward allocator module 10, for the mesh community predistribution channel set for dividing；

Distribution module 20, for according to described channel set, constructing time slot subgraph to mesh community, according to described time slot Channel in described channel set is distributed to the relevant link of described mesh community by figure.

In plane mesh network structure, node division close for geographical position is become mesh community, in mesh community All nodes can directly directly communicate with the node in adjacent mesh community, is the top layer mesh net of network between mesh community Network structure, is bottom mesh network structure between the interior nodes of mesh community, so, just defines the mesh network structure of layering.

In the mesh network structure of layering, in units of mesh community, use preallocated scheme, forward allocator module 10 For one channel set of mesh community predistribution divided in advance, the channel number that this mesh community is distributed is by this mesh community Actual node number and total transceiver interface number determine, the common signal channel number of neighbours mesh minizone distribution is closed by mesh minizone How many links of connection determines.

On the basis of channel predistribution, available channel resources in network is carried out the most dynamically distribution.When certain In the gap cycle, according to the channel set distributed by mesh community, when layering mesh topology of networks is decomposed into multiple Gap subgraph, the distribution module 20 channel in the channel set that each time slot is pre-assigned to mesh community distributes to time slot Link concrete in figure.

Channel dividing arrangement in a kind of wireless mesh network provided by the present invention, by pre-to the mesh community divided Distribution channel set, at certain slot cycle, uses non-slotted channel distribution method, is distributed to by the channel in channel set The relevant link of mesh community, utilizes this distribution method, can improve radio channel resource utilization rate, reduce network do Disturb, and can guarantee that channel reasonable distribution between the relevant link of mesh community and utilization, to improve channel distributional equity.

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

Acquiring unit 11, the quantity of the total and publicly-owned channel of channel needed for obtaining mesh community respectively；

First allocation unit 12, being used for according to the quantity of publicly-owned channel is that publicly-owned channel is distributed in described mesh community；

Second allocation unit 13, being used for according to the quantity of the total and publicly-owned channel of channel needed for mesh community is that mesh is little District's distribution internal channel.

In this step, acquiring unit 11 by the method for computing, can obtain channel needed for mesh community sum and The quantity of the publicly-owned channel of mesh community and neighbours mesh community.

In the present embodiment, layering mesh network connects figure and represents with undirected multigraph G (V, E), and wherein V represents N number of mesh Set of cells, E represents all-network link set, defines mesh community v_i, i=1,2 ..., N, mesh community v_iThe joint comprised Count as n (v_i), in mesh community, each node Transmit-Receive Unit number of ports is r (j), r (j) >=1, j=1,2 ..., n (v_i), Mesh community v_iVirtual interface number R (v_i)=∑_j∈V(i)r(j)≥n(v_i), in network, set of available channels is K={1, 2 ..., F}, | K |=F, so, for mesh community v_i, in its virtual interface number and network, number of channels available is as computing The factor, determines this mesh community v_iThe sum of required channel is

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

Wherein, α ∈ Z⁺{ 0} represents the channel that increases due to channel space multiplexing of mesh community.

Mesh community v_iInternal number of links l (v_i) up to (n (v_i)×(n(v_i)-1))/2, due to neighbours mesh community Between also can directly communicate, define V_c={ v_j, v_j∈ V} is mesh community v_iNeighbours' mesh set of cells,J=1, 2 ..., t, t≤| V |, then mesh community v_iIt is up to the common link number of its neighbours mesh communityThis Sample mesh community v_iAssociated link sum isLittle for mesh District v_i, with this mesh community v_iWith the common link number of neighbours mesh community and the number of links of mesh Intra-cell as computing because of Son, determines this mesh community 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 community v_iThe common signal channel sum of the distribution between ∈ V and its all neighbor nodes isMeet d_s(v_i)≤|C(v_i)|.Definition adjacency matrix M={e_ij: e ∈ E} represents the adjacent square of figure G Battle array, the connection of the corresponding mesh community of every a line of this matrix.e_ij=1 represents that node i and j are neighbor node, and e_ij =e_ji, in particular cases during i=j, e_ii=0.Simultaneously between definition neighbours mesh community in addition to common signal channel, remaining distribution The channel disabling collection of not common channel is combined into T₁, rather than when the distance between neighbours mesh community is less than frequency reuse distance, its Frequency disabling collection is combined into T₂, andThe input of algorithm is set of available channels K in network, virtual interface number R (v_i), mesh community v_iNumber of links L (v with its neighbours' mesh cell association_iv_j), adjacency matrix M and channel disabling set T₁ With frequency disabling set T₂, it is output as mesh community v_iChannel set C (the v being assigned to_i)。

First allocation unit 12 is according to the mesh community v calculating gained_iCommon signal channel sum d_s(v_i), for mesh community v_iDistribute the channel of this quantity.Its allocation rule mesh to be ensured community v_iIt is assigned to publicly-owned channel with its neighbours mesh community, Certain co-channel multiplexing can not distribute identical channel set, and the interchannel of its distribution from interior non-neighbours mesh minizone Difference do not fall frequency disabling set T₂In, otherwise, then it is dry in its currently used channel of distribution for using greedy optimization algorithm Disturb the channel of minimum.

According to mesh community v_iThe sum of required channel | C (v_i) | and quantity d of publicly-owned channel_s(v_i), for mesh community v_iDistribution (| C (v_i)|-d_s(v_i)) channel of quantity, to meet mesh community v_iInternal channel demands.Channel allocation rule is The channel differences that mesh Intra-cell and mesh minizone are assigned to not to fall at channel disabling set T₁In, non-neighbours mesh is little Distinguish the channel differences being fitted on can not fall at frequency disabling set T₂In.

By calculating the publicly-owned channel quantity of the total number of channels needed for mesh community and mesh community and neighbours mesh community, Second allocation unit 13 for the distribution of mesh community for the publicly-owned channel of neighbours' mesh cell communication, then with needed for mesh community Total number of channels deduct the quantity of publicly-owned channel and obtain the internal channel number of mesh community, distribute the letter of this quantity for mesh community Road, both can ensure the connectedness of mesh community and neighbours mesh minizone network, ensure that the communication of mesh Intra-cell.

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

Structural unit 21, for according to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot Subgraph；Described time slot subgraph includes described mesh community and the common link of neighbours mesh community and the chain of mesh Intra-cell Road；

Allocation unit 22, for according to described time slot subgraph, distributes publicly-owned channel to described mesh community and neighbours mesh The common link of community, distribution internal channel gives the link of described mesh Intra-cell.

Mesh community v_iWith its neighbours mesh community v_jPublicly-owned channel set number bemesh Cell channel collection is combined into C (v_i).Definition time slot subgraph H_τ(V_τ, E_τ), meet H_τ∈ G, 1≤τ≤T.Definition non-slotted channel distribution moments Battle arrayAs mesh community v_iWith its neighbours mesh community v_jBetween multilink be assigned with Channel k, or v_i=v_jIn the case of mesh Intra-cell link distribution channel k time,Same time slot each of the links can only Distribute channel, therefore a 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 non-slotted channel distribution, same time slot mesh community v_iThe number of channel of the limit distribution of association can not be more than it The number of channel comprised in channel set and its virtual interface number.

Definition time slot virtual interface channel uses matrixAs mesh community v_iCertain When individual interface uses channel kThe most same time slot mesh community v_iThe number of channel used to meet following constraint:

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

Additionally, for mesh community v_i, the limit number L (v of its association_i) it is typically greater than mesh cell virtual number of ports 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 community v_iWith its neighbours mesh community v_jBetween common signal channel number | C (v_iv_j) |, structure The common edge of time slot subgraph neighbor node, due to mesh community v_iInternal number of available channels isEqually Structure mesh community v_iInternal chain way.So can construct the first time slot subgraph comprising all nodesWherein, wherein V₁=V,。

The input of algorithm is network connection figure G=(V, E), mesh community v_iSet of available channels C (v_i), virtual interface Number R (v_i) and mesh community v_iThe limit number L (v of association_i), it is output as the subgraph H of each time slot_τAnd the channel distribution feelings of correspondence Condition.

The subgraph H that the allocation unit 22 time slot to being constructed generates₁(V₁, E₁) carry out channel distribution.From C (v_iv_jChoose in) Channel distributes to mesh community v_iWith its neighbours mesh community v_jBetween all links of association, and from channel setIn choose channel and distribute to mesh community v_iInternal link.

Publicly-owned channel according to mesh community and internal channel, construct time slot subgraph within the cycle, by publicly-owned channel set and The channel that internal channel is concentrated distributes to the concrete link in time slot subgraph, it is ensured that in each time slot channel resource allocation To link as much as possible, further increase channel resource utilization rate and network capacity.

With reference to Fig. 8, the another embodiment of the channel dividing arrangement in proposition a kind of wireless mesh network of the present invention, distribute mould Block 20 also includes:

Whether judging unit 23, exist interference between the link judging to distribute same channel；

Delete unit 24, in this way, then delete from described time slot subgraph in the link being assigned to same channel Interfering link, retains an active link.

Judging unit 23 judges time slot subgraph H₁In be assigned with between the link of same channel whether there is interference, if do not deposited , then it is assumed that the distribution of time slot link channel is feasible.

In the present embodiment, when non-slotted channel distributes for arbitrary link e of subgraph, definitionDoing for limit e Disturb limit collection.Definition link (e_i, k) with (e_j, k) for the both links pair interfered, wherein e_j∈I(e_i) and e_i∈I(e_j), 1 ≤k≤F。

Interference is there is, then by this both links (e between the link of same channel as judged to be assigned with_i, k) with (e_j, k) in Any bar interfering link delete from time slot subgraph, only retain an active link.

In the present embodiment, to H₁After the distribution of subgraph channel, by H₁Delete from the original figure G=(V, E) that reconnect more, available New network connects figure G₁(V, E), i.e. G₁=G-H₁。

To new connection figure G₁At the time slot subgraph that next time slot τ structure is newWherein V_τ= V,1≤τ≤T, then to time slot subgraph H_τCarry out channel distribution, until the connection figure obtained after T time slotAlgorithm stops, 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 foregoing is only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or it is relevant to be directly or indirectly used in other Technical field, be the most in like manner included in the scope of patent protection of the present invention.

Claims (8)

1. the method for channel allocation in a wireless mesh network, it is characterised in that including:

For the mesh community predistribution channel set divided；

According to described channel set, mesh community is constructed time slot subgraph, according to described time slot subgraph by described channel set Channel distribute to the relevant link of described mesh community；

Wherein, described mesh community predistribution one channel set for dividing includes:

The quantity of the total and publicly-owned channel of channel needed for acquisition mesh community respectively；

Quantity according to publicly-owned channel is that publicly-owned channel is distributed in described mesh community；

It is that internal channel is distributed in mesh community according to the quantity of the total and publicly-owned channel of channel needed for mesh community.

2. the method for channel allocation in wireless mesh network as claimed in claim 1, it is characterised in that

The quantity of available channel in the virtual interface number of mesh community and network is carried out computing as operational factor, obtains described The sum of channel needed for mesh community；

Using the common link number of described mesh community and neighbours mesh community and the number of links of mesh Intra-cell as computing because of Son carries out computing, obtains the quantity of publicly-owned channel.

3. the method for channel allocation in wireless mesh network as claimed in claim 2, it is characterised in that described according to described letter Road set, constructs time slot subgraph to mesh community, and the channel in described channel set is distributed to the relevant of described mesh community Link includes:

According to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot subgraph；Described time slot subgraph bag Include described mesh community and the common link of neighbours mesh community and the link of mesh Intra-cell；

According to described time slot subgraph, distribute the publicly-owned channel common link to described mesh community with neighbours mesh community, distribution Internal channel gives the link of described mesh Intra-cell.

4. the method for channel allocation in wireless mesh network as claimed in claim 3, it is characterised in that performing according to described Time slot subgraph, distributes the publicly-owned channel common link to described mesh community with neighbours mesh community, and distribution internal channel is to institute After stating the link of mesh Intra-cell, also include:

Judge to distribute and whether there is interference between the link of same channel；

In this way, then deleting the interfering link in the link being assigned to same channel from described time slot subgraph, retaining one has Effect link.

5. the channel dividing arrangement in a wireless mesh network, it is characterised in that including:

Forward allocator module, for the mesh community predistribution channel set for dividing；

Distribution module, for according to described channel set, constructing time slot subgraph to mesh community, according to described time slot subgraph by institute State the channel in channel set and distribute to the relevant link of described mesh community；

Wherein, described forward allocator module includes:

Acquiring unit, the quantity of the total and publicly-owned channel of channel needed for obtaining mesh community respectively；

First allocation unit, being used for according to the quantity of publicly-owned channel is that publicly-owned channel is distributed in described mesh community；

Second allocation unit, being used for according to the quantity of the total and publicly-owned channel of channel needed for mesh community is the distribution of mesh community Internal channel.

6. the channel dividing arrangement in wireless mesh network as claimed in claim 5, it is characterised in that described acquiring unit leads to Cross in the following manner to realize:

The quantity of available channel in the virtual interface number of mesh community and network is carried out computing as operational factor, obtains described The sum of channel needed for mesh community；

Using the common link number of described mesh community and neighbours mesh community and the number of links of mesh Intra-cell as computing because of Son carries out computing, obtains the quantity of publicly-owned channel.

7. the channel dividing arrangement in wireless mesh network as claimed in claim 6 is characterized in that, described distribution module bag Include:

Structural unit, for according to the publicly-owned channel in described mesh community and internal channel, at each slot construction time slot subgraph；Institute State time slot subgraph and include described mesh community and the common link of neighbours mesh community and the link of mesh Intra-cell；

Allocation unit, for according to described time slot subgraph, distributes publicly-owned channel to described mesh community and neighbours mesh community Common link, distribution internal channel gives the link of described mesh Intra-cell.

8. the channel dividing arrangement in wireless mesh network as claimed in claim 7 is characterized in that, described distribution module is also Including:

Whether judging unit, exist interference between the link judging to distribute same channel；

Delete unit, in this way, then from described time slot subgraph, delete the interference chain in the link being assigned to same channel Road, retains an active link.