CN106879031A - A kind of channel wireless radio multi Mesh network resource negotiation method based on double receipts single-shots - Google Patents
A kind of channel wireless radio multi Mesh network resource negotiation method based on double receipts single-shots Download PDFInfo
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
Abstract
The invention discloses a kind of channel wireless radio multi Mesh network resource negotiation method based on double receipts single-shots, each node possesses main channel and perceptual channel, and main channel can be sent or receive, and perceptual channel can only be received；When there is packets need to send, main channel is switched to transmission state and the working channel of main channel is adjusted into control channel by sending node, send RTS frames, the information carried in RTS frames includes the data channel recommended, then main channel is switched to reception state and the working channel of main channel is adjusted to the data channel of recommendation by sending node, after receiving node listens to RTS frames, do not responded if during receiving node is in and is communicated with other nodes, otherwise main channel is switched to transmission state and the working channel of main channel is adjusted to the data channel of recommendation by receiving node, send CTS frames, confirmation is carried in CTS frames.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of channel wireless radio multi Mesh network based on double receipts single-shots
Resource negotiation method.
Background technology
Wireless Mesh network is a kind of distributed, multi-hop wireless network of self-organizing, and its maximum advantage is that it is born
Network fault tolerance ability, it is easy to set up, and bandwidth higher.In traditional wireless Mesh netword, if there is a pair of communication nodes to lead to
Letter, all of neighbor node in the jump communication range in same channel will mourn in silence, and can thus make the profit of channel
It is greatly lowered with rate.
Multichannel technology is that one kind can make network possess multiple physical channels, and node can carry out the skill of multichannel communication
Art.For compared to traditional single channel technology, overcoming can only be communicated using single channel, the data of all nodes and
The bottleneck that signaling is all transmitted by a physical channel, greatly improves the network bandwidth and power system capacity, but give each section
The multiple physical channels of point configuration can bring the problem of the aspects such as price, volume, mobility and power consumption to node again.
Disclose a kind of using the access mechanism based on carrier sense/conflict avoidance (CSMA/CA) in the prior art.It is multiplex
In the case of family, control signaling needs to intercept channel before sending with user data, if the free time can compete transmission, if channel
It is busy, then wait for a period of time until the data information transfer in channel is initiated again after terminating.If data produce to have conflicted also need
Rollback trial is carried out, the re-transmission of related data information is carried out.Under the mechanism, the data message that node needs send must lead to
The command negotiation process that competition is waited is crossed, and serious conflict will be produced when node density is larger, cause systematic function drastically
Decline.The communication situation of unsuitable high bandwidth requirements, and some feedback-less signaling frame Yi Dan conflict after can only lose；Separately
Outward, the problem of concealed terminal, will also result in being greatly lowered for bandwidth.
A kind of CSMA/CS mechanism is also disclosed in the prior art, and node device has data frame when transmitting, can initiate RTS-
CTS frame negotiations processes.RTS frames are per se with two purposes：The right to use of Radio Link is preengage, and requirement receives this message
Other working nodes keep silent.Once receiving RTS frames, receiving terminal can be with CTS frame responses.As RTS frames, CTS frames
Working node near making is kept silent.When RTS/CTS completes interaction, sending node is to be transmitted above transmittable
Frame, without having to worry about the interference from other concealed nodes.Under CSMA/CS mechanism, node device have data need transmission when,
RTS frames are initiated, Correspondent Node must reply CTS frames to determine that channel can use.During this period, other neighbor node equipments are in and detect
Listen state.If sending node has multiple neighbours, the silence period of its neighbor node is then the sending node equipment and its most long distance
From the message frame interaction time delay of neighbor node.This mechanism sacrifices its bandwidth usage to reduce the collision rate of control channel
Rate.When neighbor node number increases, the network convergence time of system will deteriorate.
The content of the invention
Goal of the invention：It is an object of the invention to provide it is a kind of can solve the problem that defect present in prior art based on double receipts
The channel wireless radio multi Mesh network resource negotiation method of single-shot.
Technical scheme：Channel wireless radio multi Mesh network resource negotiation method based on double receipts single-shots of the present invention, often
Individual node all possesses main channel and perceptual channel, and main channel can be sent or receive, and perceptual channel can only be received, at main channel
Perceptual channel is also at reception state when reception state, and perceptual channel is in IDEL states when main channel is in transmission state；
When there is packets need to send, main channel is switched to transmission state and is adjusted to the working channel of main channel by sending node
Control channel, sends RTS frames, and the information carried in RTS frames includes the data channel recommended, and then sending node cuts main channel
Reception state and the data channel for being adjusted to recommend by the working channel of main channel are shifted to, after receiving node listens to RTS frames, such as
Fruit receiving node is in during being communicated with other nodes and does not respond then, and otherwise main channel is switched to hair by receiving node
State and the data channel for being adjusted to recommend by the working channel of main channel are sent, CTS frames are sent, confirmation is carried in CTS frames.
Further, the working channel of the main channel can switch between control channel and multiple data channels, perceive logical
The working channel in road is fixed as control channel.The working channel of perceptual channel is so fixed as control channel, is greatly reduced
Twin-channel hardware cost.
Further, before receiving node sends CTS frames, first judge current channel seizure ratio whether less than CTS to be sent
The priority sending threshold value of frame：If be less than, CTS frames are sent；Otherwise, then the packet of higher priority is waited to be sent
New channel seizure ratio is detected again afterwards, until channel seizure ratio just sends when being less than the priority sending threshold value of CTS frames to be sent
CTS frames.The stand-by period that the carrier sense before CTS frames send and competition send so effectively is eliminated, the transmission of CTS frames is reduced
Collision rate, improve system bandwidth, be more suitable for telecommunication scene compared to traditional CSMA mechanism.
Further, the channel seizure ratio is calculated by formula (1)：
In formula (1), v is channel seizure ratio, and T is statistics duration, shown in t such as formulas (2)；
In formula (2), LrThe data word joint number indicated by all RTS frames listened in control channel for receiving node it
With lrFor receiving node receive data the byte number that is carried using each symbol under modulating-coding pattern, ltIt is receiving node
Send data the modulation that is used by CTS frames to be sent of the byte number that is carried using each symbol under modulating-coding pattern
Byte or symbol under coding mode, t1Be each symbol eat dishes without rice or wine take time, LtFor all numbers that receiving node sends
According to byte number sum, the sum of the data frame that n sends and receives for receiving node, t0It is propagation delay time.
Further, the priority sending threshold value of the CTS frames to be sent passes through configuration file when receiving node does not go up electricity
It imported into receiving node.
Further, service priority, Q0S letter of the priority sending threshold value of the CTS frames to be sent according to residing for CTS frames
The patient data collision probability of breath and CTS frames institute is obtained；The service priority is according to voice, video and does one's best
Business is divided into high, medium and low three priority.
Further, if sending node does not receive CTS frames in Preset Time, main channel is switched into transmission state simultaneously
The working channel of main channel is adjusted to control channel, RTS frames is then resend, then main channel is switched into reception state simultaneously
The data channel that the working channel of main channel is adjusted to recommend.
Beneficial effect：Compared with prior art, the present invention has following beneficial effect：
1) each node possesses main channel and perceptual channel in the present invention, significantly reduce signaling under single-channel mode,
The immense pressure that the same channel of data sharing brings to signaling traffic load, network is increased by the method for improving space reuse degree
The node pair of communication, reduces the interference of channel simultaneously, improves the utilization rate of channel, significantly improves network capacity；
2) in the present invention, any signaling frame that node sends all is unidirectional, and its response frame is all in the data letter for consulting
Transmitted on road, neighbor node is mourned in silence after listening to signaling frame without holding, substantially increases the channel utilization of control channel.
Brief description of the drawings
Fig. 1 is the topological structure of the wireless communication multichannel network in the specific embodiment of the invention；
Fig. 2 is the multichannel control signaling working mechanism in the specific embodiment of the invention；
Fig. 3 is the flow chart of the judgement of the data is activation based on channel seizure ratio in the specific embodiment of the invention.
Specific embodiment
With reference to the accompanying drawings and detailed description, technical scheme is further introduced.
This specific embodiment discloses a kind of channel wireless radio multi Mesh network resource negotiation method based on double receipts single-shots,
Each node possesses main channel and perceptual channel, and main channel can be sent or receive, and perceptual channel can only be received, main channel
Perceptual channel is also at reception state during in reception state, and perceptual channel is in IDEL shapes when main channel is in transmission state
State, the working channel of main channel can switch between control channel and multiple data channels, and the working channel of perceptual channel is fixed
It is control channel.When there is packets need to send, main channel is switched to transmission state and by the work of main channel by sending node
Make channel adjustment for control channel, send RTS frames, the information carried in RTS frames includes the data channel recommended, and then sends section
Main channel is switched to reception state and the working channel of main channel is adjusted to the data channel of recommendation by point.Receiving node is intercepted
To after RTS frames, if the destination node ID in detecting the frame head of RTS frames is this node, make the following judgment：If connect
Receipts node is in during being communicated with other nodes and does not respond then；Otherwise main channel is switched to transmission shape by receiving node
State and the data channel for being adjusted to recommend by the working channel of main channel, send CTS frames, and confirmation is carried in CTS frames.
Wherein, node ID number is the logical number for indicating node, and node passes through in configuration file delivery node when not going up electricity,
Numbered in same Mesh network unique.
Before receiving node sends CTS frames, a decision mechanism can also be set, namely judge current channel seizure ratio
Whether the priority sending threshold value of to be sent CTS frame is less than：If be less than, CTS frames are sent；Otherwise, then higher prior is waited
The packet of level detects new channel seizure ratio again after being sent, until channel seizure ratio is preferential less than CTS frames to be sent
CTS frames are just sent during level sending threshold value.When so effectively eliminating the wait that the carrier sense before CTS frames send and competition send
Between, the collision rate of CTS frames transmission is reduced, system bandwidth is improved, it is more suitable for compared to traditional CSMA mechanism remote logical
Letter scene.
Wherein, channel seizure ratio is calculated by formula (1)：
In formula (1), v is channel seizure ratio, and T is statistics duration, shown in t such as formulas (2)；
In formula (2), LrThe data word joint number indicated by all RTS frames listened in control channel for receiving node it
With lrFor receiving node receive data the byte number that is carried using each symbol under modulating-coding pattern, ltIt is receiving node
Send data the modulation that is used by CTS frames to be sent of the byte number that is carried using each symbol under modulating-coding pattern
Byte or symbol under coding mode, t1Be each symbol eat dishes without rice or wine take time, LtFor all numbers that receiving node sends
According to byte number sum, the sum of the data frame that n sends and receives for receiving node, t0It is propagation delay time.
The priority sending threshold value of CTS frames to be sent imported into reception section when receiving node does not go up electricity by configuration file
In point, the patient data collision probability of service priority, Q0S information and CTS frames institute according to residing for CTS frames is obtained；Institute
State service priority and be divided into high, medium and low three priority according to voice, video and Best-Effort service.
Additionally, going back sending node can set Retransmission timeout mechanism：If sending node does not receive CTS in Preset Time
Frame, then switch to main channel transmission state and the working channel of main channel be adjusted into control channel, then resends RTS
Frame, then main channel is switched into reception state and the working channel of main channel is adjusted to the data channel of recommendation.
Fig. 1 is a topological structure for wireless communication multichannel network, it is seen then that this wireless Mesh netword is by A, B, C and D
This four node compositions, any of which node is all in the range of a jump Communication Jamming of other nodes.Under Single Channel Case,
When node A is communicated with B, node C, D must keep due to being under same Single Channel Case with node A, B according to agreement
Mourn in silence and cannot communicate, can otherwise produce channel confliction.
However, each node in this specific embodiment possesses main channel and perceptual channel, wherein, main channel is referred to as
P channel, can also transmit signaling frame with transmitting data frame, can work on the different channels；Perceptual channel is referred to as channel S, only
For perceiving signaling, it is operated on control channel Fc.
Assuming that when node A and B are communicated using channel Fd1, in order to avoid the conflict of cochannel, node C and D can use letter
Road Fd2 is communicated, and will not produce interference to the link of node A and B.The channel S of node A, B, C and D shares same
Control channel Fc, other nodes on Fc channels can also be so intercepted while node A carries out data receiver on Fd1 and is sent
Signaling information, so significantly reduce signaling under single-channel mode, data sharing same channel and signaling traffic load brought
Immense pressure, the method using space reuse degree is improved increases the node pair that network communicates simultaneously, reduces the interference of channel,
The utilization rate of channel is improved, network capacity is significantly improved.Meanwhile, the simplified design of channel S has been greatly reduced twin-channel hard
Part cost.
Fig. 2 describes the asymmetric Signalling exchange pattern under multichannel framework.As illustrated in fig. 2, it is assumed that node A will be to node
B sends business, and A must first initiate to consult, and determine the flow and working channel of this business.This process be by RTS frames with
CTS frames are come what is completed, and negotiations process is as follows：
1) node A will send data length, recommended work channel, send data traffic phase according to the result of scheduler schedules
Group RTS frames are transmitted pass information (being mainly modulating-coding pattern, but not limited to this here) on Fc channels, and open re-transmission
Timer t1, is then switched to be received on data channel Fd；
2) after node B frames hear RTS frames, if being now in its neighbor node D communication process, do not respond,
Abandon the frame；Otherwise switch to Fd and respond CTS frames, confirmation is carried in frame.
If 3) node A receives CTS frames, stop retransmission timer t1, otherwise switch to Fc channels, resend RTS
Frame.
Under traditional C/S MA mechanism, node A needs to wait the CTS frames of other side after having sent RTS frames, during this period other neighbours
Node needs holding to mourn in silence after receiving the RTS frames, to avoid sending data collision with node B, in telecommunication (>
100km), the air interface transmission time>1ms, can not carry out any signalling during this period, so as to cause control channel utilization rate
Reduce.And in this embodiment, any signaling frame that node sends all is unidirectional, its response frame is all being consulted
It is transmitted on data channel, neighbor node, without keeping mourning in silence, substantially increases the letter of control channel after RTS frames are listened to
Road utilization rate.
After negotiation is finished, node A and B start to carry out data transmission on Fd1 channels.Start channel on node A after electricity
Statistics timer t2, a length of T during setting.The local memory of node A safeguards a channel statistical list, and list is with channel number as rope
Draw, following information is recorded in table：Timing statisticses T interior nodes A is received and the data word for sending data frame number n, node A is successfully transmitted
The data word joint number Lt that other nodes that joint number Lr and node A are listened to send.Then calculated according to formula (1) and formula (2)
To the channel seizure ratio of each data channel.
The MAC layer of node A is classified the packet come from Internet according to service priority, in this specific embodiment party
In formula, business according to voice, video and Best-Effort service is divided into high, medium and low three-level and enters priority query respectively.Node
The scheduler of A is scheduled according to priority to queue, and the channel occupancy of selected channel then is counted into v and business number to be sent
It is compared according to the priority sending threshold value v0 of bag, works as v<Packet will be sent during v0, work as v>Packet will be herein during v0
Waited for a period of time in the corresponding priority query of packet, until the packet of high priority is sent completely, the packet is
" channel occupancy statistics " v can be again detected, can judgement send.
The flow chart of above procedure is as shown in figure 3, because the threshold value of high priority packets is higher than lower-priority data bag
Threshold value, channel statistical timing statisticses section T in, channel occupancy statistics is constantly accumulated with the transmission of packet, reach first low
The threshold value of priority service packet, now the packet of low priority will stop sending, and the packet of high-priority service
Can also continue to send.At the end of the channel system time period, new channel statistical window will be produced and detection obtains new letter
Road takes statistics, and now the packet of relatively low service priority can reattempt to transmission.Can be realized to data according to the algorithm
The control of flow.
Claims (7)
1. a kind of based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, it is characterised in that：Each node
Possess main channel and perceptual channel, main channel can be sent or receive, and perceptual channel can only be received, main channel is in and receives shape
Perceptual channel is also at reception state during state, and perceptual channel is in IDEL states when main channel is in transmission state；When there is data
When bag needs to send, main channel is switched to transmission state and the working channel of main channel is adjusted into control letter by sending node
Road, sends RTS frames, and the information carried in RTS frames includes the data channel recommended, and then main channel is switched to and connect by sending node
Receipts state and the data channel for being adjusted to recommend by the working channel of main channel, after receiving node listens to RTS frames, if received
Node is in during being communicated with other nodes and does not respond then, and otherwise main channel is switched to transmission state by receiving node
And the data channel for being adjusted to recommend by the working channel of main channel, CTS frames are sent, carry confirmation in CTS frames.
2. according to claim 1 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：The working channel of the main channel can switch between control channel and multiple data channels, the work letter of perceptual channel
Road is fixed as control channel.
3. according to claim 1 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：Before receiving node sends CTS frames, first judge whether current channel seizure ratio is less than the priority of CTS frames to be sent
Sending threshold value：If be less than, CTS frames are sent；Otherwise, then the packet of higher priority is waited to detect new again after being sent
Channel seizure ratio, until channel seizure ratio less than CTS frames to be sent priority sending threshold value when just transmission CTS frames.
4. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：The channel seizure ratio is calculated by formula (1)：
In formula (1), v is channel seizure ratio, and T is statistics duration, shown in t such as formulas (2)；
In formula (2), LrThe data word joint number sum indicated by all RTS frames listened in control channel for receiving node, lrFor
Receiving node receive data the byte number that is carried using each symbol under modulating-coding pattern, ltFor receiving node sends number
According to the modulating-coding mould that is used by CTS frames to be sent of the byte number that is carried using each symbol under modulating-coding pattern
Byte or symbol under formula, t1Be each symbol eat dishes without rice or wine take time, LtFor all data bytes that receiving node sends
Number sum, the sum of the data frame that n sends and receives for receiving node, t0It is propagation delay time.
5. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：The priority sending threshold value of the CTS frames to be sent imported into reception when receiving node does not go up electricity by configuration file
In node.
6. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：Service priority of the priority sending threshold value of the CTS frames to be sent according to residing for CTS frames, Q0S information and CTS
The patient data collision probability of frame institute is obtained；The service priority is divided into according to voice, video and Best-Effort service
High, medium and low three priority.
7. according to claim 1 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shots, its feature
It is：If sending node does not receive CTS frames in Preset Time, main channel is switched into transmission state and by main channel
Working channel is adjusted to control channel, then resends RTS frames, then main channel is switched into reception state and by main channel
Working channel is adjusted to the data channel recommended.
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| CN113079108A (en) * | 2021-03-18 | 2021-07-06 | 中电科航空电子有限公司 | Method and system for improving communication efficiency of network architecture |
| CN117579679A (en) * | 2024-01-15 | 2024-02-20 | 海马云（天津）信息技术有限公司 | Signaling interaction method and device, electronic equipment and storage medium |
| CN117579679B (en) * | 2024-01-15 | 2024-04-19 | 海马云（天津）信息技术有限公司 | Signaling interaction method and device, electronic equipment and storage medium |
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