CN101621837A - Channel switching method, mesh network node and mesh network - Google Patents
Channel switching method, mesh network node and mesh network Download PDFInfo
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Abstract
The embodiment of the invention relates to a channel switching method, a mesh network node and a mesh network. The channel switching method comprises the following steps: acquiring channel information of a plurality of channels comprised in a mesh network node, wherein the channel information of the plurality of channels comprises link information of working channels and neighbor information of unbuilt links, and neighbor information of nonworking channels; selecting a new channel of radio frequency which needs channel switching according to the acquired channel information of the plurality of channels; and switching the radio frequency which needs channel switching to the new channel from the prior working channel. The method provides richer reference information for the mesh network node to perform channel switching by acquiring the information of the plurality of channels comprised in the mesh network node, facilitates the mesh network node making rational channel switching decision according to the channel information of the plurality of channels comprised in the mesh network node, and improves the rationality of channel switching so as to improve the communication quality of the mesh network.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of channel switching method, mesh network node and mesh network.
Background technology
Mesh network (Mesh Network is called for short mesh network) also claims " multi-hop " network, is a kind of and the diverse novel radio network of conventional wireless network.Mesh network can combine with technology such as multiple wireless access wide band technology, 3G mobile communication, forms a based on wireless mesh network (Wireless Mesh Network is called for short WMN) that contains the multi-hop wireless link.In the mesh network, (Mesh Point MP) is connected with one or more other nodes each mesh network node.Each node only carries out direct communication with neighbor node, i.e. a communication of jumping, and the communication between two nonneighbor nodes need be passed through other node transfers, i.e. the communication of multi-hop.Many radio frequencies multichannel (Multi-radio/Multi-channel) technology is to improve the important technology of mesh network performance.Mesh network based on many radio frequencies multichannel technology can comprise a plurality of channels; In order to make full use of each channel in the mesh network, (MeshPoint MP) can be furnished with a plurality of radio frequencies (Radio is also referred to as transceiver) to each mesh network node, and each transceiver is operated in different channels respectively.When between mesh network node MP, communicating, a radio frequency operation is arranged on identical channel in two nodes that guarantee at least to communicate.Each radio frequency of node can switch to other channel from the work at present channel, to reduce the interference of adjacent node, thereby eliminated vie each other in the mesh network channel and the problem that the increase of disturbing caused bandwidth along with jumping figure reduces gradually, realized " bandwidth value preserving ".Therefore, the reasonable switching of channel has significant effects to the overall performance of mesh network in the mesh network.
The method of prior art about realizing that in mesh network channel switches normally according to the working channel information at mesh network node MP radio frequency place, selected the new channel that needs switching channels radio frequency and this radio frequency to switch to, and the channel that carries out radio frequency switches.The inventor finds in realizing process of the present invention, there is following defective at least in prior art: the information of foundation is less when selection need be carried out the new channel of channel switching radio frequency, the reasonability that causes channel to switch is relatively poor, switch problems such as the unreasonable network congestion that causes, cochannel interference, communication delay because of channel comparatively serious, thereby cause integrated communication second-rate.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of channel switching method, mesh network node and mesh network, in order to the reasonability of channel switching in the raising mesh network, thereby improves communication quality.
For solving the problems of the technologies described above, embodiment of the invention first aspect provides a kind of channel switching method, comprising:
Obtain the channel information of a plurality of channels that mesh network node comprises; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel;
According to the channel information of a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels;
To need the described radio frequency of switching channels to switch to described new channel from former working channel.
The channel switching method that embodiment of the invention first aspect proposes, by obtaining a plurality of channel informations that mesh network node comprises, for carrying out the channel switching, mesh network node provides abundanter reference information, channel switches decision to make things convenient for the channel information of a plurality of channels that mesh network node comprises according to mesh network node to make comparatively reasonably, improve the reasonability that channel switches, thereby improve the communication quality of mesh network.
For solving the problems of the technologies described above, embodiment of the invention second aspect provides a kind of mesh network node, comprising:
Acquisition module is used to obtain the channel information of a plurality of channels that mesh network node comprises; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel;
Choose module, be used for the channel information according to a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels;
Handover module is used for and will needs the described radio frequency of switching channels to switch to described new channel from former working channel.
In the mesh network node that embodiment of the invention second aspect proposes, obtain the channel information of a plurality of channels by acquisition module, provide abundanter reference information for choosing module formulation channel selection strategy, help choosing a plurality of channel informations that module comprises according to mesh network node and make comparatively reasonably that channel switches decision, improve handover module and carry out the reasonability that channel switches, thereby improve the communication quality of mesh network.
For solving the problems of the technologies described above, the embodiment of the invention third aspect provides a kind of mesh network, comprises mesh network node, former working channel neighbor node and new channel neighbor node;
Described mesh network node comprises: acquisition module is used to obtain the channel information of a plurality of channels that mesh network node comprises; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel; Choose module, be used for the channel information according to a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels; Handover module is used for and will needs the described radio frequency of switching channels to switch to described new channel from former working channel;
Described former working channel neighbor node is used to broadcast or clean culture carries the channel information announcement of the channel information of described former working channel neighbor node;
Described new channel neighbor node is used to broadcast or clean culture carries the channel information announcement of the channel information of described new channel neighbor node.
In the mesh network that the embodiment of the invention third aspect proposes, mesh network node provides abundanter reference information by obtaining the channel information of a plurality of channels for formulating the channel selection strategy; In addition, neighbor node (comprising former working channel neighbor node and new channel neighbor node) broadcasting and clean culture be the channel information of node separately, helping mesh network node obtains the more channel information of this mesh network node and (comprises the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel), being convenient to make comparatively reasonably, channel switches decision, improve the reasonability that channel switches, thereby improve the communication quality of mesh network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a channel switching method embodiment flow chart of the present invention;
Fig. 2 obtains the channel information system embodiment schematic diagram of two-hop neighbor node for the present invention;
The flow chart that channel information obtained when Fig. 3 started for channel switching method embodiment MP of the present invention;
The flow chart that Fig. 4 obtains for channel information in the channel switching method embodiment communication process of the present invention;
The Signalling exchange figure that Fig. 5 switches for channel switching method embodiment autonomous type channel of the present invention;
Fig. 6 consults the Signalling exchange figure that the formula channel switches for channel switching method embodiment of the present invention;
Fig. 7 is the mesh network node first example structure figure of the present invention;
Fig. 8 is the mesh network node second example structure figure of the present invention;
Fig. 9 is mesh network example structure figure of the present invention.
Embodiment
Below by drawings and Examples, the technical scheme of the embodiment of the invention is described in further detail.Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Embodiment one
Fig. 1 is an embodiment of the invention channel switching method embodiment flow chart.Present embodiment may further comprise the steps 11～step 13:
Step 11, mesh network node (MP) obtain the channel information of a plurality of channels of this mesh network node (MP), and can further obtain the channel information of these all channels of mesh network node; This channel information comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel.
In the mesh network based on many radio frequencies multichannel technology, each mesh network node (MP) comprises a plurality of channels, and each mesh network node (MP) also is furnished with a plurality of radio frequencies, and mesh network node (MP) is that each radio frequency distributes different channels.Generally, for a mesh network node (MP), channel (channel that comprises with mesh network is identical) quantity is more than radio frequency quantity, and for example: the radio frequency that a mesh network node (MP) distributes is at most 4 radio frequencies, and the channel quantity of 802.11a frequency range is 12.As seen, in the identical moment, all channels in the mesh network node (MP) are not all to be assigned to radio frequency to use, divide according to the operating position that channel is current, channel can comprise working channel and inoperative channel in the mesh network node (MP), that is: at a time down, the channel of having distributed to the radio frequency use is the working channel of the embodiment of the invention; And the unallocated channel that uses to radio frequency is the inoperative channel of the embodiment of the invention; The working channel at radio frequency place is the work at present channel of this radio frequency; The working channel that radio frequency switches preceding place is the former working channel of this radio frequency; The destination channel that radio frequency need switch to is the new channel of the embodiment of the invention.
Because certain radio frequency of mesh network node (MP) at a time can only be operated under the channel, be less than under the situation of the number of channel at the radio frequency number so, the channel information of all channels that mesh network node (MP) comprises, can obtain when when mesh network node (MP) starts, carrying out all scan channels, also can after finishing, mesh network node (MP) startup in communication process, obtain by radio frequency.The channel information here comprises the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel.Link information can comprise: in the mesh network node (MP), radio frequency is traffic carrying capacity, received power, frame error rate and the average transmission rate of the address information of neighbours' radio frequency of link connection (as: MAC Address of neighbours' radio frequency), forward direction and reverse link.Neighbor information comprises: neighbours' radio frequency of the address of neighbours' radio frequency of link connection (as: MAC Address of neighbours' radio frequency) information and not link connection is not to the received power of current radio frequency.Neighbours' radio frequency is to current radio frequency received power, can obtain by the power of measuring neighbours' radio frequency that current radio frequency receives.
Step 12, mesh network node (MP) are according to the channel information that obtains, and selection needs the new channel of the radio frequency of switching channels.
Behind the channel information that has obtained a plurality of channels of mesh network node (MP), can be neatly the channel information of a plurality of channels be applied in the formulation of concrete channel selection strategy, convenient selection needs the radio frequency of switching channels, selects the suitable new channel that need switch to for this radio frequency.Present embodiment has also been considered the inoperative channel information of MP when selecting new channel for the radio frequency that need carry out the channel switching, be convenient to select suitable new channel.For example:, can select to have the new channel of suitable quantity neighbours radio frequency for guaranteeing communication quality.Neighbours' radio frequency quantity seldom even do not have the new channel of neighbours' radio frequency, the communication of radio frequency is easily interrupted; And a lot of new channel of neighbours' radio frequency quantity, the serious interference of cochannel, communication quality descends on the contrary.Therefore,, therefore, carrying out channel when choosing because present embodiment has obtained the neighbor information of inoperative channel, can be with reference to the neighbor information of inoperative channel, the radio frequency that switches for needs selects have the new channel of suitable quantity neighbours radio frequency.As for having what neighbours' radio frequencies are suitable quantities, then can pre-determine because of concrete network environment.
Step 13, mesh network node (MP) will need the radio frequency of switching channels to switch to new channel from former working channel.
Mesh network node (MP) can be initiated the channel switching flow for after the radio frequency that needs switching channels chooses new channel.In concrete channel switching process, can adopt autonomous type channel switching mode, timing switching mode or the formula of negotiation channel switching mode to carry out channel and switch.Adopt regularly switching mode to carry out channel when switching, needing the temporal information that the radio frequency that switches can be when handover operation be carried out in the announcement of neighbours' radio frequency, as: prolong and how long carry out channel and switch.When adopting negotiation formula channel switching mode to carry out the channel switching, need carry out the radio frequency of channel switching and can hold consultation respectively with each neighbours' radio frequency of the former working channel of this radio frequency, new each neighbours' radio frequency of channel respectively, so that improve the reasonability that channel switches.
Present embodiment is by obtaining a plurality of channel informations that mesh network node comprises, neighbor information with reference to the inoperative channel, for carrying out the channel switching, mesh network node provides abundanter reference information, channel switches decision to make things convenient for the channel information of all channels that mesh network node comprises according to mesh network node to make comparatively reasonably, improve the reasonability that channel switches, thereby improve the communication quality of mesh network.
On the basis of present embodiment technical scheme, after if mesh network node (MP) has obtained channel information, also can announce the channel information of this node by broadcast mode or mode of unicast to other mesh network nodes (MP) of mesh network, make in the mesh network, each mesh network node (MP) can obtain more channel information, so that more reasonably formulate the channel switchover policy.A mesh network node (MP) can comprise following information to the channel information of other mesh network nodes (MP) announcement:
The working channel of each radio frequency of this mesh network node (MP);
Each radio frequency of this mesh network node (MP) is on working channel separately, and set up the link information between neighbours' radio frequency of link, this link information can comprise: the traffic carrying capacity of the MAC Address of neighbours' radio frequency, forward direction and reverse link, received power, frame error rate and average transmission rate;
Each radio frequency of this mesh network node (MP) is on working channel separately, and about not setting up the neighbor information of link, this neighbor information can comprise: the MAC Address of neighbours' radio frequency, neighbours' radio frequency are to the received power of current radio frequency etc.; And
The neighbor information of this mesh network node (MP) on the inoperative channel, this neighbor information can comprise: the MAC Address of neighbours' radio frequency, neighbours' radio frequency arrive the received power of current radio frequency etc.
When the mutual above-mentioned channel information of mesh network node (MP), can expand by the frame that the existing communication agreement has been defined, carry this channel information in the frame after expansion.For example: can expand existing beacon frame of IEEE802.11 agreement (Beacon frame) or explore frame (Probe frame), carry above-mentioned channel information in the frame after expansion.In addition, also can adopt the frame of a redetermination to carry above-mentioned channel information, as: channel information announcement frame.The information example that table 1 comprises for embodiment of the invention channel information announcement frame.As known from Table 1, be subjected to all single-hop neighbours' of this mesh network node (MP) " channel information announcement frame " when certain mesh network node (MP) after, can know the channel information of all double bounces of this mesh network node (MP) with interior each neighbour.
The information example that table 1 embodiment of the invention channel information announcement frame comprises
| The frame territory | Implication |
| ? ??Node?ID | The device identification of this node (for the mesh network node (MP) of many radio frequencies, Node ID can be the MAC Address of the main radio frequency of this node) |
| ??Local?MAC?Number | The radio frequency number of this node |
| ??Total?Channel?Number | The total channel number (working channel and the inoperative channel that comprise this section point radio frequency) of announcement |
| ??MAC?Number?of?neighbors ??without?link(#c) | On c channel, do not set up the number of neighbours' radio frequency of link |
| ??MAC?Address?of?neighbor ??without?link(#c，#n) | On c channel, do not set up the MAC Address of n neighbours' radio frequency of link |
| ??Received?Power?of?neighbor ??without?link(#c，#n) | In channel scan procedure, do not set up the received power of n neighbours' radio frequency of link on c the channel that measures to this node |
| ??Local?MAC?Existed?Indicator ??(#c) | Whether indication exists the sign of this section point radio frequency on c channel |
| ??Local?MAC?Address(#c) | The MAC address of the radio frequency of this node on c channel |
| ??Peer?MAC?Number(#c) | The number of this node opposite end radio frequency of established link on c channel |
| ??Peer?MAC?Address(#c，#m) | The MAC Address of m the opposite end radio frequency of this node on c channel |
| ??Link?Forward?Traffic?Amount ??(#k，#m) | The forward business amount information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??Link?Reverse?Traffic?Amount ??(#k，#m) | The reverse traffic amount information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??LinkForwardReceivedPower(# ??k，#m) | The forward direction received power information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??LinkReverseReceived?Power ??(#k，#m) | The reverse received power information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??Link?Forward?PER(#k，#m) | The forward direction frame error rate information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??Link?Reverse?PER(#k，#m) | The reverse frame error rate information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??Link?Forward?Average ??Rate(#k，#m) | The forward direction Mean Speed information of link between k radio frequency of this node and m the opposite end radio frequency |
| ??Link?Reverse?Average ??Rate(#k，#m) | The reverse Mean Speed information of link between k radio frequency of this node and m the opposite end radio frequency |
Embodiment two
Fig. 2 obtains the channel information system embodiment schematic diagram of two-hop neighbor node for the present invention.As shown in Figure 2, because mesh network node (MP) B is in sending to the channel information announcement frame of mesh network node (MP) A, carry the neighbor node E of mesh network node (MP) B and the channel information of node F, therefore mesh network node (MP) A can obtain the channel information of mesh network node (MP) B, E and F simultaneously after receiving the channel information announcement frame of mesh network node (MP) B; In like manner, mesh network node (MP) A can obtain the channel information of mesh network node (MP) C, G and H simultaneously after receiving the channel information announcement frame of mesh network node (MP) C; Mesh network node (MP) A can obtain the channel information of mesh network node (MP) D, I and J simultaneously after receiving the channel information announcement frame of mesh network node (MP) D.What be different from prior art is, receive the channel information announcement frame of all neighbor nodes as mesh network node (MP) A after, can know the channel information of the whole neighbours' channels of mesh network node (MP) A, thereby provide more reference information for mesh network node (MP) A formulates the channel switchover policy.Make full use of these information, mesh network node (MP) can be made more excellent channel allocation decision-making to self each radio frequency, helps improving the reasonability that channel switches, thereby improves communication quality.
Embodiment three
The flow chart that channel information obtained when Fig. 3 started for channel switching method embodiment mesh network node of the present invention (MP).As shown in Figure 3, channel switching method embodiment of the present invention can scan a plurality of channels of described mesh network node according to preset rules by a plurality of radio frequencies when mesh network node starts; According to the result of scan channel, obtain the channel information of channel.Concrete, channel switching method embodiment step 11 of the present invention can may further comprise the steps 31～step 37:
When mesh network node (MP) just starts (start), because mesh network node (MP) does not also carry out the distribution of working channel to each radio frequency, in order to improve mesh network node (MP) scan channel efficient and to save time, therefore a plurality of radio frequencies that comprise by mesh network node (MP), carry out the scanning of working channel, as: can participate in carrying out scan channel by all radio frequencies that mesh network node (MP) comprises.Because the quantity of channel is more than the quantity of radio frequency, therefore but the several channels of each radio frequency picked at random scan, each radio frequency is scanned with default rule, only need to guarantee that all channels that this mesh network node (MP) comprises can both be scanned, step 32-step 36 for example, wherein, step 32-step 36 only is a kind of flow process of specific implementation method, and the actual scan channel that starts is not limited thereto.
When collecting the channel information of neighbours' radio frequency, can adopt the active collection mode, also can adopt passive collection mode.Wherein, the active collection mode for example: radio frequency 1 is collected request to neighbours' radio frequency channel information, obtains the channel information of neighbours' radio frequency in the message according to each neighbours' radio-frequency (RF) FEEDBACK.Passive collection mode is for example: radio frequency is intercepted the channel information of neighbours' radio-frequency (RF) broadcast in respective channel, radio frequency 1 is intercepted the channel information of neighbours' radio-frequency (RF) broadcast of radio frequency 1 at channel 1, the content that comprises about channel information can see the description of channel switching method the foregoing description of the present invention for details, repeats no more.
Whether step 36, mesh network node (MP) finish the scanning of all channels, are execution in step 37 then; Otherwise execution in step 34.
Present embodiment adopts many radio frequencies to carry out scan channel by when mesh network node (MP) is opened, and has improved the efficient of scan channel; Simultaneously, by mesh network node (MP) when opening, all channels that this mesh network node (MP) is comprised scan, collect the neighbor information of each channel, provide more reference information for mesh network node (MP) carries out the radio frequency operation channel allocation, mesh network node (MP) can determine which channel which radio frequency should preferably be operated on according to these information; And, in the subsequent channel switching flow, mesh network node (MP) also can determine which channel the radio frequency that need carry out the channel switching should preferably switch on according to the channel information of each channel, help improving the reasonability that channel switches, thereby improve communication quality.
Embodiment four
The flow chart that Fig. 4 obtains for channel information in the channel switching method embodiment communication process of the present invention.As shown in Figure 4, channel switching method embodiment of the present invention scanning channel and obtain the flow process of the channel information of all channels in communication process, comprise: in communication process, collect the link information of the current place of each radio frequency working channel respectively and do not set up the neighbor information of link; Satisfy the neighbor information that the default radio frequency that scans trigger condition scanned and collected each inoperative channel respectively.Concrete, channel switching method embodiment step 11 of the present invention can may further comprise the steps 41～step 411:
Obtaining of the channel information of working channel can be collected by each radio frequency in communication process.But not the collection of the channel information of working channel needs radio frequency to switch to the inoperative channel, carries out scan channel.Usually each radio frequency all has self metastable working channel, if switch to continually on the inoperative channel, carries out the scanning of MP inoperative channel, will produce bigger influence to communication quality.Therefore, preferred, for carrying out the inoperative scan channel, radio frequency sets in advance the scanning trigger condition, and make and carry out the radio frequency that satisfies default scanning trigger condition the scanning of inoperative channel, thereby obtain the neighbor information of inoperative channel.Wherein, set in advance the scanning trigger condition and can include but not limited to following condition:
The time of condition (1), radio frequency all link fractures on the work at present channel is more than or equal to first preset time T 1;
Condition (2), radio frequency do not receive and send data in second preset time T 2;
Condition (3), radio frequency are higher than predetermined threshold value in the average frame error rate of link connection; Perhaps
Condition (4), MP do not carry out scan channel in the 3rd preset time T 3.
The length of preset time T 1, T2 and T3 can set in advance according to actual needs.Setting in advance the scanning trigger condition is under condition (1), (2) or (3), and scan channel is carried out by that unusual radio frequency occurring; And be under the condition (4) setting in advance the scanning trigger condition, scan channel is carried out by this MP that minimum radio frequency of the traffic in a period of time recently.When judging the radio frequency that satisfies default scanning trigger condition, can determine radio frequency according in condition (1), (2) (3) or (4) any, perhaps can take all factors into consideration a plurality of conditions and determine radio frequency, for example, adopt shown in the following steps 42～step 45, take all factors into consideration above four conditions and carry out determining step.
When the channel information of neighbours' radio frequency of collecting each inoperative channel, radio frequency R can adopt the active collection mode, also can adopt passive collection mode.Wherein, the active collection mode for example: radio frequency R collects request to neighbours' radio frequency channel information, obtains the channel information of neighbours' radio frequency in the message according to each neighbours' radio-frequency (RF) FEEDBACK.Passive collection mode is for example: the channel information announcement frame that radio frequency R intercepts neighbours' radio-frequency (RF) broadcast in respective channel, can obtain the neighbor information of each inoperative channel of this MP according to the channel information announcement frame of each neighbours' radio frequency.
The link information of the working channel that present embodiment MP obtains according to each radio frequency and do not set up the neighbor information of link and the neighbor information of the inoperative channel that radio frequency R obtains, thereby obtain the up-to-date channel information of all channels of MP, MP can upgrade the former channel information of MP according to the up-to-date channel information that obtains.MP can determine which channel the radio frequency that need carry out the channel switching should preferably switch on according to these channel informations after obtaining the channel information of all channels, the convenient preference policy of formulating helps improving the reasonability that channel switches, thereby improves communication quality.
Embodiment five
The Signalling exchange figure that Fig. 5 switches for channel switching method embodiment autonomous type channel of the present invention.The channel switchover policy that present embodiment hypothesis mesh network node (MP) is formulated is: the radio frequency of choosing that needs switching channels is radio frequency R, and radio frequency R is switched to new channel (channel Y) from former working channel (channel X).As shown in Figure 5, channel switching method embodiment of the present invention adopts the flow process of autonomous type switching channels, and channel switching method embodiment step 13 promptly of the present invention can comprise the steps 51～step 53:
Step 51, radio frequency R are in former working channel (channel X), neighbours' radio frequency on former working channel (being former working channel neighbours radio frequency) broadcasting or unicast tunnel switch announcement, and this channel switches the sign that announcement comprises former working channel (X channel) and new channel (Y-channel).Preferably, channel switches announcement can switch the formal representation of announcing frame (Channel Switching Advertisement) by channel, and the information example that channel switching announcement frame comprises is referring to table 2.The send mode that channel switches the announcement frame can adopt broadcasting or mode of unicast.The benefit of broadcast frame is to limit the information content of propagating on the wireless media; The mode of unicast frame is the reliability that increases message.
Table 2 embodiment of the invention channel switches the information example that the announcement frame comprises
| The frame territory | Implication |
| ??Switching?MAC?Address | This node will be made the radio frequency MAC Address that channel switches |
| ??Old?Regulatory?Class | The classification logotype of the old channel at the present place of this radio frequency |
| ??Old?Channel?Number | The channel number of the old channel at the present place of this radio frequency |
| ??New?Regulatory?Class | The classification logotype of the new channel that this radio frequency will switch to |
| ??New?Channel?Number | The channel number of the new channel that this radio frequency will switch to |
Step 52, radio frequency R switch to new channel (channel Y) from former working channel (channel X).
Step 53, radio frequency R are in new channel (channel Y), and the neighbours' radio frequency on new channel (channel Y) (being new channel neighbours radio frequency) broadcasting or unicast tunnel switch the announcement frame.Channel switches the content of announcement frame referring to table 2.
Present embodiment MP since the channel information that adopts all channels as reference information, can be the radio frequency that need carry out the channel switching and formulate rational switchover policy, under this prerequisite, present embodiment adopts the autonomous type changing method can also further improve the efficient that channel switches.
On the basis of present embodiment technical scheme, switch in the announcement frame to the channel of former working channel neighbours radio-frequency (RF) broadcast or clean culture at radio frequency R, go back portability channel information switching time.This time restriction information that switching time, information was switched for radio frequency R execution channel, as: the delayed data of channel switching or the moment of channel switching etc. carried out.Former working channel neighbours radio frequency is when receiving the channel switching announcement frame that includes channel information switching time; can know that radio frequency R carries out the concrete time that channel switches; therefore convenient former working channel neighbours radio frequency is taked the communications protection measure at this section in the period; make and carry out after channel switches that communicating by letter between former working channel neighbours radio frequency and other network element can not interrupted at radio frequency R.
Embodiment six
Fig. 6 consults the signaling diagram that the formula channel switches for channel switching method embodiment of the present invention.The channel switchover policy that present embodiment hypothesis mesh network node (MP) is formulated is: the radio frequency of choosing that needs switching channels is radio frequency R, and radio frequency R is switched to new channel (channel Y) from former working channel (channel X).As shown in Figure 6, channel switching method embodiment of the present invention adopts the flow process of negotiation formula switching channels, and channel switching method embodiment step 13 promptly of the present invention can may further comprise the steps 61～step 614:
Step 61, radio frequency R on former working channel X to each neighbours' radio-frequency (RF) broadcast channel switch request, preferably, this channel switch request can channel switch request frame (Channel Switching Request) formal representation, the information example that the channel switch request frame comprises is referring to table 3.Can comprise the sign of former working channel (channel X), new channel Y and the reason that channel switches in the channel switch request frame.The reason that this channel switches may be the former working channel link of too poor, the former working channel X of too busy, the former working channel X of former working channel X channel quality very little or the like, be not limited to above situation.Also can set the reason that channel switches in practice as required.The information example that table 3 comprises for embodiment of the invention channel switch request frame.As known from Table 3, the information that comprises of channel switch request frame (Channel Switching Request) mainly contains: classification logotype and channel number and the channel switch reasons (can stipulate as required) of the classification logotype of the MAC Address of radio frequency R, former working channel X and channel number, new working channel Y.
The information example that table 3 embodiment of the invention channel switch request frame comprises
| The frame territory | Implication |
| ??Switching?MAC?Address | This node will be made the radio frequency MAC Address that channel switches |
| ??Old?Regulatory?Class | The classification logotype of the former working channel at the present place of this radio frequency |
| ??Old?Channel?Number | The channel number of the former working channel at the present place of this radio frequency |
| ??New?Regulatory?Class | The classification logotype of the new channel that this radio frequency will switch to |
| ??New?Channel?Number | The channel number of the new channel that this radio frequency will switch to |
| ??Switch?Reason | Channel switch reasons (can stipulate as required) |
Step 62, startup timer, timing T5, this timing T5 can be the Preset Time that sets in advance.
Each neighbours' radio frequency on step 63, the former working channel judges whether to agree the handoff request of radio frequency R according to s own situation.If agree, then the communication quality of neighbours' radio frequency self is taked the safeguard measure preset, make take described safeguard measure after, former working channel neighbours radio frequency can not interrupt because the switching of this secondary channel with communicating by letter of other network element.Neighbours' radio frequency takes safeguard measure can effectively reduce the influence of radio frequency R channel handover operation to self to the communication of self.For example, this safeguard measure can be: the data of self issuing radio frequency R are sent finish; After the link fracture of assurance and radio frequency R, also there is other routed path that arrives gateway, for example sets up a routed path that does not pass through radio frequency R to gateway.Certainly, concrete measure is not limited thereto.
Step 64, former working channel neighbours radio frequency are to radio frequency R unicast tunnel handoff response.Preferably, the formal representation that the channel handoff response can channel handoff response frame (Channel Switching Response), the information example that channel handoff response frame comprises is referring to table 4.Former working channel neighbours radio frequency is agreed handover information or refusal handover information by channel handoff response frame feedback.If neighbours' radio frequency is agreed the handoff request of radio frequency R, then in channel handoff response frame, to add in order to agree handover information (as: be used to agree switch sign), this radio frequency handoff request of notice radio frequency R is allowed to; If neighbours' radio frequency is disagreed with the handoff request of radio frequency R, then in channel handoff response frame, to add in order to expression refusal handover information (as: be used to agree switch sign), this radio frequency handoff request of notice radio frequency R is rejected.
The information example that table 4 comprises for embodiment of the invention channel handoff response frame.As known from Table 4, the information that comprises of channel handoff response frame (Channel Switching Response) mainly contains: opposite end neighbours' radio frequency MAC Address of receive channel handoff request, this MP will do the sign that MAC Address, agreement or the refusal of the radio frequency that channel switches switch.
The information example that table 4 embodiment of the invention channel handoff response frame comprises
| The frame territory | Implication |
| ??Local?MAC?Address | Receive opposite end neighbours' radio frequency MAC Address of request |
| ??Switching?MAC?Address | This node will be made the radio frequency MAC Address that channel switches |
| ??Accept?or?Reject | The sign of agreeing or refusing to switch |
When step 65, radio frequency R regularly finished (the T5 time is overtime), the response condition according to former working channel neighbours radio frequency judged whether to cancel this time handoff request.Judge whether to receive the channel handoff response frame of neighbours' radio frequency of all established links on the former working channel as: radio frequency R.If radio frequency R does not receive the channel handoff response frame of all neighbours' radio frequencies, perhaps have at least and comprise refusal information (sign of switching as the expression refusal) in the channel handoff response frame of neighbours' radio frequency, then this time radio frequency handoff request, execution in step 66 are cancelled in radio frequency R decision; Otherwise radio frequency R does not cancel this time radio frequency handoff request, execution in step 67.
Step 66, to former working channel neighbours radio-frequency (RF) broadcast channel handover cancelling information, preferably, channel handover cancelling information can channel handover cancelling frame (Channel Switching Cancel) formal representation, the information example that channel handoff response frame comprises is referring to table 5.Radio frequency R resides on the former working channel, and flow process finishes.Comprise in this channel handover cancelling frame that this MP need make the MAC Address of the radio frequency of channel switching, in order to notify each neighbours' radio frequency of former working channel, this MAC Address respective radio-frequency cancellation channel switch request.
The information example that table 5 embodiment of the invention channel handover cancelling frame comprises
| The frame territory | Implication |
| ??Switching?MAC?Address | This node will be made the radio frequency MAC Address that channel switches |
If step 67 radio frequency R does not cancel switching, then radio frequency R temporarily switches on the new channel Y, to each new channel neighbours radio-frequency (RF) broadcast channel switch request frame; Wherein, the form of channel switch request frame can reference table 3.
Step 68, startup timer, timing T6, this timing T6 can be the Preset Time that sets in advance.
Step 69, new channel neighbours radio frequency judge whether to agree the handoff request of radio frequency R according to s own situation.
Step 610, new channel Y neighbours radio frequency feed back new channel Y neighbours radio frequency agreement or refuse this channel switch request by this channel handoff response frame to radio frequency R unicast tunnel handoff response frame, and this channel handoff response frame can reference table 4.
When step 611, timing end (the T6 time is overtime), radio frequency R judges whether to cancel this secondary channel handoff request according to the response condition of new channel neighbours radio frequency.If radio frequency R does not receive the channel handoff response frame of all neighbours' radio frequencies, perhaps have at least and comprise refusal information (sign of switching as the expression refusal) in the channel handoff response frame of neighbours' radio frequency, then radio frequency R determines that new channel neighbours radio frequency refuses this channel switch request, initiate channel handover cancelling flow process, execution in step 612-613; If radio frequency R does not cancel switching, then radio frequency R determines that new channel neighbours radio frequency agrees this channel switch request, continues the channel switching flow, execution in step 614-615.
Step 612, radio frequency R notify each new channel neighbours radio frequency this channel switch request cancellation to new channel neighbours radio-frequency (RF) broadcast or unicast tunnel handover cancelling frame.
Step 613, radio frequency R return former working channel X, to former working channel neighbours radio-frequency (RF) broadcast or unicast tunnel handover cancelling frame, notify each former working channel neighbours radio frequency this channel switch request cancellation.Afterwards, radio frequency R resides on the former working channel X, process ends.
Step 614, radio frequency R temporarily return former working channel X, switch the announcement frame to former working channel neighbours radio-frequency (RF) broadcast or unicast tunnel, notify each former working channel neighbours radio frequency, and radio frequency R switches to new channel Y from former working channel X, and resides on the new channel Y.
Step 615, radio frequency R switch to new channel Y and reside on the new channel Y, switch the announcement frame to new channel neighbours radio-frequency (RF) broadcast or unicast tunnel, notify each new channel neighbours radio frequency, radio frequency R switches to new channel Y from former working channel X, and reside on the new channel Y process ends.
The inventor is realizing process discovery of the present invention, the negotiation mode that existing channel switches is normally: need carry out the radio frequency that radio frequency switches and only hold consultation with the former working channel radio frequency of this radio frequency neighbours, radio frequency according to negotiation result cancellation switch or carry out the channel hand-off process.The defective that the prior art exists is: if radio frequency is only held consultation with neighbours' radio frequency of former working channel, then neighbours' radio frequency of new channel does not receive the channel switch request that radio frequency sends, new channel neighbours radio frequency can't be judged this handoff request, make radio frequency not receive the feedback of new channel neighbours radio frequency, thereby the result who causes channel to switch is unreasonable.What be different from prior art is, the radio frequency that present embodiment MP need carry out the channel switching is adopting negotiation mode not only to consult with the former working channel neighbours of this radio frequency radio frequency, after consensus with former working channel neighbours radio frequency, also further consult with new channel neighbours radio frequency, effectively guarantee the reasonability that channel switches, thereby improved communication quality.
Embodiment seven
Fig. 7 is the mesh network node first example structure figure of the present invention.Present embodiment comprises acquisition module 71, chooses module 72 and handover module 73.
Choose module 72 and be used for channel information, need to select the new channel of the radio frequency of switching channels according to a plurality of channels of obtaining.
Wherein, in the present embodiment, above-mentioned a plurality of channels can be all channels, also can be the local channels that comprises working channel and inoperative channel.
Present embodiment obtains the channel information of a plurality of channels by acquisition module, provide abundanter reference information for choosing module formulation channel switchover policy, help choosing a plurality of channel informations that module comprises according to mesh network node and make comparatively reasonably that channel switches decision, improve handover module and carry out the reasonability that channel switches, thereby improve the communication quality of mesh network.
Embodiment eight
Fig. 8 is the mesh network node second example structure figure of the present invention.The difference of present embodiment and mesh network node of the present invention first embodiment is that acquisition module 71 can comprise startup acquiring unit 711 or communication acquiring unit 712 at least; Handover module 73 can comprise direct switch unit 731, timing switch unit 732 at least or consult switch unit 733.
Starting acquiring unit 711 is used for scanning all channels that this mesh network node comprises by a plurality of radio frequencies according to preset rules when this mesh network node starts; According to the result of scan channel, obtain the channel information of all channels.
Directly switch unit 731 is used for switching announcement to former working channel neighbours radio-frequency (RF) broadcast that needs the switching channels radio frequency or unicast tunnel; Switch to new channel from former working channel; Switch announcement to new channel neighbours radio-frequency (RF) broadcast or the described channel of clean culture.
Regularly switch unit 732 is used for switching announcement at the radio frequency that needs switching channels to the channel of former working channel neighbours radio-frequency (RF) broadcast or clean culture, carries channel information switching time; This, information was that this needs the radio frequency of switching channels to carry out time restriction information that channel switches switching time.
The present embodiment mesh network node can be by starting acquiring unit obtains all channels when this node starts channel information, when distinguishing working channel for each radio frequency for node, more reference information is provided, help node and be that each radio frequency distributes more rational working channel, these channel informations that obtain also can be used as chooses the reference information of module when formulating concrete channel switchover policy; In addition, mesh network node also can obtain the channel information of working channel and inoperative channel by the communication acquiring unit in the radio communication process, formulate preferred channel switchover policy more reference information is provided for choosing module; Further, because present embodiment can form the higher channel switchover policy of reasonability, therefore, can adopt the mode of directly switching to carry out channel by direct switch unit and directly switch for improving switching efficiency and saving time; Can carry out the timing switching of channel by the timing switching mode, in addition, also switch unit carries out the former working channel neighbours radio frequency of the radio frequency of channel switching with needs respectively through consultation, new channel neighbours radio frequency is held consultation, so that improve the reasonability that channel switches, thereby improves communication quality.
Embodiment nine
Fig. 9 is mesh network example structure figure of the present invention.As shown in Figure 9, present embodiment comprises: mesh network node 91, former working channel neighbor node 92 and new channel neighbor node 93.
Choose module 912 and be used for channel information, need to select the new channel of the radio frequency of switching channels according to a plurality of channels of obtaining.
Former working channel neighbor node 92 is used to broadcast or clean culture carries the channel information announcement of the channel information of former working channel neighbor node 92.
New channel neighbor node 93 is used to broadcast or clean culture carries the channel information announcement of the channel information of new channel neighbor node 93.
The present embodiment mesh network node provides abundanter reference information by obtaining the channel information of a plurality of channels for formulating the channel selection strategy; In addition, neighbor node (comprising former working channel neighbor node and new channel neighbor node) broadcasting and clean culture be the channel information of node separately, helping mesh network node obtains the more channel information of this mesh network node and (comprises the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel), being convenient to make comparatively reasonably, channel switches decision, improve the reasonability that channel switches, thereby improve the communication quality of mesh network.
In the present embodiment, former working channel neighbor node can be one or more; New channel neighbor node also can be one or more; Further refinement functional module about mesh network node can repeat no more referring to the record of mesh network node second embodiment of the present invention (embodiment eight) and Fig. 8.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of a preferred embodiment, and module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (18)
1, a kind of channel switching method is characterized in that, comprising:
Obtain the channel information of a plurality of channels of mesh network node; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel;
According to the channel information of a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels;
To need the described radio frequency of switching channels to switch to described new channel from former working channel.
2, channel switching method according to claim 1 is characterized in that, the described channel information that obtains a plurality of channels that mesh network node comprises comprises:
When mesh network node starts, scan a plurality of channels that described mesh network node comprises according to preset rules by a plurality of radio frequencies; According to the result of scan channel, obtain the channel information of all channels.
3, channel switching method according to claim 1 is characterized in that, the described channel information that obtains a plurality of channels that mesh network node comprises comprises:
In communication process, collect the link information of the current place of each radio frequency working channel respectively and do not set up the neighbor information of link;
Satisfy the neighbor information that the default radio frequency that scans trigger condition scanned and collected each inoperative channel respectively.
According to claim 2 or 3 described channel switching methods, it is characterized in that 4, described link information comprises traffic carrying capacity, received power, frame error rate and the average transmission rate of address information, forward direction and reverse link of neighbours' radio frequency of link connection; Described neighbor information comprises: neighbours' radio frequency of the address information of neighbours' radio frequency of link connection and not link connection is not to the received power of current radio frequency.
5, channel switching method according to claim 3 is characterized in that, described default scanning trigger condition comprises:
The time of radio frequency all link fractures on the work at present channel is more than or equal to first Preset Time; Or
Radio frequency does not receive and sends data in second Preset Time; Or
Radio frequency is higher than predetermined threshold value in the average frame error rate of link connection; Or
Mesh network node does not carry out scan channel in the 3rd Preset Time; Or
More than arbitrarily a plurality of combination.
6, channel switching method according to claim 5 is characterized in that, the neighbor information that the described radio frequency that satisfies default scanning trigger condition scanned and collected each inoperative channel respectively comprises:
Satisfy the radio frequency of default scanning trigger condition, to former working channel neighbours radio-frequency (RF) broadcast or unicast tunnel scanning beginning to announce frame; Switch to corresponding channel according to the preset channel numbering; When the channel after described radio frequency switches is the working channel of other radio frequencies, skips this channel and switch in other channels; When the channel after switching is the inoperative channel of described mesh network node, the neighbor information of collecting this inoperative channel; After finishing all scan channels, return former working channel, and finish the announcement frame to former working channel neighbours radio-frequency (RF) broadcast scan channel.
7, channel switching method according to claim 1 is characterized in that, the described radio frequency of switching channels that will need switches to new channel from former working channel, comprising:
Described radio frequency switches announcement to former working channel neighbours radio-frequency (RF) broadcast or unicast tunnel; Switch to described new channel from former working channel; Switch announcement to new channel neighbours radio-frequency (RF) broadcast or the described channel of clean culture.
8, channel switching method according to claim 7 is characterized in that, also comprises: switch in the announcement at the channel of described radio frequency to former working channel neighbours radio-frequency (RF) broadcast or clean culture, carry channel information switching time; Described switching time, information was that described radio frequency is carried out the time restriction information that channel switches.
9, channel switching method according to claim 1 is characterized in that, the described radio frequency of switching channels that will need switches to new channel from former working channel, comprising:
Described radio frequency is to former working channel neighbours radio-frequency (RF) broadcast or unicast tunnel handoff request;
When definite each described former working channel neighbours radio frequency is all agreed described channel switch request, to the described channel switch request of new channel neighbours radio-frequency (RF) broadcast;
When definite each described new channel neighbours radio frequency is all agreed described channel switch request, switch announcement to former working channel neighbours radio frequency and new channel neighbours radio-frequency (RF) broadcast channel, switch and reside in described new channel.
10, channel switching method according to claim 9 is characterized in that, described definite each described former working channel neighbours radio frequency or new channel neighbours radio frequency are all agreed described channel switch request, comprising:
In Preset Time, if described radio frequency receives the channel handoff response of each former working channel neighbours radio frequency or new channel neighbours radio frequency, and the channel handoff response comprises when agreeing handover information, and then described radio frequency determines that former working channel neighbours radio frequency agrees described channel switch request.
11, channel switching method according to claim 9 is characterized in that, also comprises:
When definite described former working channel neighbours radio frequency was refused described channel switch request, described radio frequency resided in former working channel to former working channel neighbours radio-frequency (RF) broadcast channel handover cancelling information.
12, channel switching method according to claim 9 is characterized in that, also comprises:
When definite described new channel neighbours radio frequency was refused described channel switch request, described radio frequency was made channel neighbours radio-frequency (RF) broadcast channel handover cancelling information to each new channel radio frequency and employee, switched and resided in former working channel.
According to claim 11 or 12 described channel switching methods, it is characterized in that 13, described definite former working channel neighbours radio frequency or new channel neighbours radio frequency are refused described channel switch request, comprising:
In Preset Time, if described radio frequency does not receive the channel handoff response of each former working channel neighbours radio frequency or new channel neighbours radio frequency, perhaps in the channel handoff response that described radio frequency receives, have at least a channel handoff response to comprise the refusal handover information, then described radio frequency determines that former working channel neighbours radio frequency or new channel neighbours radio frequency refuse described channel switch request.
14, channel switching method according to claim 9; it is characterized in that; when described former working channel neighbours radio frequency receives described channel switch request; former working channel neighbours radio frequency carries out respective handling according to default safeguard measure; make take described safeguard measure after, described former working channel neighbours radio frequency can not interrupt because the switching of this secondary channel with communicating by letter of other network element.
15, a kind of mesh network node is characterized in that, comprising:
Acquisition module is used to obtain the channel information of a plurality of channels that mesh network node comprises; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel;
Choose module, be used for the channel information according to a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels;
Handover module is used for and will needs the described radio frequency of switching channels to switch to described new channel from former working channel.
16, mesh network node according to claim 15 is characterized in that, described acquisition module comprises:
Start acquiring unit, be used for when described mesh network node starts, scanning all channels that described mesh network node comprises according to preset rules by a plurality of radio frequencies; According to the result of scan channel, obtain the channel information of all channels; Or
The communication acquiring unit is used at communication process, collects the link information of the current place of each radio frequency working channel respectively and does not set up the neighbor information of link; Satisfy the neighbor information that the default radio frequency that scans trigger condition scanned and collected each inoperative channel respectively.
17, according to claim 15 or 16 described mesh network nodes, it is characterized in that described handover module comprises:
Directly switch unit is used for switching announcement to the former working channel neighbours radio-frequency (RF) broadcast or the unicast tunnel of described radio frequency; Switch to described new channel from former working channel; Switch announcement to new channel neighbours radio-frequency (RF) broadcast or the described channel of clean culture; Or
Regularly switch unit is used for switching announcement at described radio frequency to the channel of former working channel neighbours radio-frequency (RF) broadcast or clean culture, carries channel information switching time; Described switching time, information was that described radio frequency is carried out the time restriction information that channel switches; Or
Consult switch unit, be used for by described radio frequency to former working channel neighbours radio-frequency (RF) broadcast channel switch request; When definite each described former working channel neighbours radio frequency is all agreed described channel switch request, to the described channel switch request of new channel neighbours radio-frequency (RF) broadcast; When definite each described new channel neighbours radio frequency is all agreed described channel switch request, switch announcement to former working channel neighbours radio frequency and new channel neighbours radio-frequency (RF) broadcast channel, switch and reside in described new channel.
18, a kind of mesh network is characterized in that, comprises mesh network node, former working channel neighbor node and new channel neighbor node;
Described mesh network node comprises: acquisition module is used to obtain the channel information of a plurality of channels that mesh network node comprises; The channel information of described a plurality of channels comprises: the link information of working channel and the neighbor information of link connection not, and the neighbor information of inoperative channel; Choose module, be used for the channel information according to a plurality of channels that obtain, selection needs the new channel of the radio frequency of switching channels; Handover module is used for and will needs the described radio frequency of switching channels to switch to described new channel from former working channel;
Described former working channel neighbor node is used to broadcast or clean culture carries the channel information announcement of the channel information of described former working channel neighbor node;
Described new channel neighbor node is used to broadcast or clean culture carries the channel information announcement of the channel information of described new channel neighbor node.
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