CN106879031B - A kind of channel wireless radio multi Mesh network resource negotiation methods based on double receipts single-shots - Google Patents
A kind of channel wireless radio multi Mesh network resource negotiation methods based on double receipts single-shots Download PDFInfo
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Abstract
The invention discloses a kind of based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, and each node has main channel and perceptual channel, and main channel can send or receive, and perceptual channel can only receive；When there is data packet to need to send, main channel is switched to transmission state and the working channel of main channel is adjusted to control channel by sending node, send RTS frame, the information carried in RTS frame 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 recommended by sending node, after receiving node listens to RTS frame, it is not responded if during receiving node is in and communicates with other nodes, otherwise main channel is switched to transmission state and the working channel of main channel is adjusted to the data channel recommended by receiving node, send CTS frame, confirmation message is carried in CTS frame.
Description
Technical field
The present invention relates to wireless communication fields, more particularly to a kind of based on double channel wireless radio multi Mesh networks for receiving single-shot
Resource negotiation method.
Background technique
Wireless Mesh network is a kind of distributed, self-organizing multi-hop wireless network, and maximum advantage is that it is born
Network fault tolerance ability is easy to set up and higher bandwidth.In traditional wireless Mesh netword, if there is a pair of of communication node logical
Letter, jumping all neighbor nodes in communication range in one in same channel will be silent, can thus make the benefit of channel
It is greatly lowered with rate.
Multichannel technology is that one kind can make network have multiple physical channels, and node can carry out the skill of multichannel communication
Art.For traditional single channel technology, overcome can only use single channel be communicated, the data of all nodes and
Signaling all passes through the bottleneck that a physical channel is transmitted, and greatly improves network bandwidth and power system capacity, but give each section
Point configures the problem of multiple physical channels can bring price, volume, mobility and energy consumption etc. to node again.
It discloses in the prior art a kind of using the access mechanism for being based on carrier sense/conflict avoidance (CSMA/CA).It is multi-purpose
In the case of family, control signaling needs to listen to channel before sending with user data, if the free time can compete transmission, if channel
It is busy, then it waits for a period of time and is initiated again after the data information transfer in channel.If data generation, which has conflicted, also to be needed
Rollback trial is carried out, the re-transmission of related data information is carried out.Under the mechanism, node needs the data information sent that must lead to
The command negotiation process that competition waits is crossed, and serious conflict will be generated when node density is larger, leads to system performance sharply
Decline.The communication situation of unsuitable high bandwidth requirements, and the signaling frame of some no feedbacks can only be lost after conflict；Separately
Outside, the problem of concealed terminal, it will also result in being greatly lowered for bandwidth.
Also disclose a kind of CSMA/CS mechanism in the prior art, node device have data frame it is to be transmitted when, RTS- can be initiated
CTS frame negotiations process.RTS frame is per se with two purposes: reserving the right to use of Radio Link, and requires to receive this message
Other working nodes keep silent.Once receiving RTS frame, receiving end can be with CTS frame response.As RTS frame, CTS frame
Neighbouring working node can be enabled to keep silent.Until RTS/CTS completes interactive process, sending node is i.e. transmittable will to be transmitted above
Frame, without having to worry about the interference from other concealed nodes.Under CSMA/CS mechanism, when node device has data to need to transmit,
RTS frame is initiated, Correspondent Node must reply CTS frame to determine that channel is available.During this period, other neighbor node equipments are in and detect
Listen state.If sending node has multiple neighbours, the silence period of neighbor node is the sending node equipment and its most long distance
Message frame interaction time delay from 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.
Summary of the invention
Goal of the invention: the object of the present invention is to provide it is a kind of be able to solve defect existing in the prior art based on double receipts
The channel wireless radio multi Mesh network resource negotiation method of single-shot.
Technical solution: it is of the present invention based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, often
A node all has main channel and perceptual channel, and main channel can send or receive, and perceptual channel can only receive, at main channel
Perceptual channel is also at reception state when reception state, and perceptual channel is in IDEL state when main channel is in transmission state；
When there is data packet to 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 frame, and the information carried in RTS frame includes the data channel recommended, and then sending node cuts main channel
It shifts to reception state and the working channel of main channel is adjusted to the data channel recommended, after receiving node listens to RTS frame, such as
Fruit receiving node is in communicated with other nodes during do not respond then, otherwise main channel is switched to hair by receiving node
It send state and the working channel of main channel is adjusted to the data channel recommended, send CTS frame, carry confirmation message in CTS frame.
Further, the working channel of the main channel can switch between control channel and multiple data channels, and perception is logical
The working channel in road is fixed as control channel.The working channel of perceptual channel is fixed as control channel in this way, is greatly reduced
Twin-channel hardware cost.
Further, before receiving node sends CTS frame, first judge whether current channel seizure ratio is lower than CTS to be sent
The priority sending threshold value of frame: if be lower than, CTS frame is sent；Otherwise, then the data packet of higher priority is waited to be sent
New channel seizure ratio is detected again afterwards, until channel seizure ratio is just sent when being lower than the priority sending threshold value of CTS frame to be sent
CTS frame.The waiting time that the carrier sense before CTS frame is sent and competition are sent effectively is eliminated in this way, reduces the transmission of CTS frame
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 formula (2)；
In formula (2), LrData word joint number indicated by all RTS frames listened to for receiving node in control channel it
With lrThe byte number that data are carried using each symbol under modulating-coding mode, l are received by receiving nodetFor receiving node
Sending the byte number that each symbol is carried under the used modulating-coding mode of data is modulation used in CTS frame to be sent
Byte or symbol under coding mode, t1It is each symbol in the time for eating dishes without rice or wine to occupy, LtAll numbers sent for receiving node
According to the sum of byte number, n is the sum for the data frame that receiving node sends and receives, t0For propagation delay time.
Further, the priority sending threshold value of the CTS frame to be sent passes through configuration file when receiving node does not power on
It imported into receiving node.
Further, priority sending threshold value service priority according to locating for CTS frame of the CTS frame to be sent, Q0S letter
The patient data collision probability of breath and CTS frame institute obtains；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 frame within a preset time, main channel is switched into transmission state simultaneously
The working channel of main channel is adjusted to control channel, then retransmits RTS frame, then main channel is switched into reception state simultaneously
The working channel of main channel is adjusted to the data channel recommended.
The utility model has the advantages that compared with prior art, the present invention have it is following the utility model has the advantages that
1) present invention in each node have main channel and perceptual channel, significantly reduce signaling under single-channel mode,
The same channel of data sharing increases network to signaling traffic load bring immense pressure, by the method for improving space reuse degree
The node pair of communication simultaneously, reduces the interference of channel, improves the utilization rate of channel, significantly improve network capacity；
2) present invention in, node send any signaling frame be all it is unidirectional, response frame all consult data letter
It is transmitted on road, neighbor node listens to after signaling frame without keeping silent, substantially increases the channel utilization of control channel.
Detailed description of the invention
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 that the data based on channel seizure ratio in the specific embodiment of the invention send the flow chart adjudicated.
Specific embodiment
With reference to the accompanying drawings and detailed description, technical solution of the present invention is further introduced.
Present embodiment discloses a kind of channel wireless radio multi Mesh network resource negotiation methods based on double receipts single-shots,
Each node has main channel and perceptual channel, and main channel can send or receive, and perceptual channel can only receive, main channel
Perceptual channel is also at reception state when in reception state, and perceptual channel is in IDEL shape when main channel is in transmission state
The working channel of state, main channel can switch between control channel and multiple data channels, and the working channel of perceptual channel is fixed
For control channel.When there is data packet to need to send, main channel is switched to transmission state and by the work of main channel by sending node
Making channel adjustment is control channel, sends RTS frame, and the information carried in RTS frame 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 recommended by point.Receiving node is listened to
To after RTS frame, if detecting that the destination node ID number in the frame head of RTS frame is this node, make the following judgment: if connect
Receive node be in communicated with other nodes during do not respond then；Otherwise main channel is switched to transmission shape by receiving node
The working channel of main channel is simultaneously adjusted to the data channel recommended by state, is sent CTS frame, is carried confirmation message in CTS frame.
Wherein, node ID number is the logical number for indicating node, is passed through in configuration file delivery node when node does not power on,
It is numbered in the same Mesh network unique.
Before receiving node sends CTS frame, a decision mechanism can also be set, namely judge current channel seizure ratio
Whether it is lower than the priority sending threshold value of CTS frame to be sent: if be lower than, sends CTS frame；Otherwise, then higher prior is waited
The data packet of grade detects new channel seizure ratio after being sent again, until channel seizure ratio is preferential lower than CTS frame to be sent
CTS frame is just sent when grade sending threshold value.When effectively eliminating the waiting that the carrier sense before CTS frame is sent and competition are sent in this way
Between, the collision rate of CTS frame transmission is reduced, system bandwidth is improved, is more suitable for compared to traditional CSMA mechanism logical at a distance
Believe 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 formula (2)；
In formula (2), LrData word joint number indicated by all RTS frames listened to for receiving node in control channel it
With lrThe byte number that data are carried using each symbol under modulating-coding mode, l are received by receiving nodetFor receiving node
Sending the byte number that each symbol is carried under the used modulating-coding mode of data is modulation used in CTS frame to be sent
Byte or symbol under coding mode, t1It is each symbol in the time for eating dishes without rice or wine to occupy, LtAll numbers sent for receiving node
According to the sum of byte number, n is the sum for the data frame that receiving node sends and receives, t0For propagation delay time.
The priority sending threshold value of CTS frame to be sent imported into reception section by configuration file when receiving node does not power on
In point, obtained according to service priority locating for CTS frame, the patient data collision probability of Q0S information and CTS frame institute；Institute
It states service priority and is divided into high, medium and low three priority according to voice, video and Best-Effort service.
In addition, going back sending node can be set Retransmission timeout mechanism: if sending node does not receive CTS within a preset time
Main channel is then switched to transmission state and the working channel of main channel is adjusted to control channel, then retransmits RTS by frame
Frame, then main channel is switched into reception state and the working channel of main channel is adjusted to the data channel recommended.
Fig. 1 is the topological structure of a 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 node are all jumped within the scope of Communication Jamming the one of other nodes.Under Single Channel Case, In
When node A is communicated with B, node C, D must be kept due to being under same Single Channel Case with node A, B according to agreement
It is silent and can not communicate, it otherwise can generate channel confliction.
However, each node in present embodiment has main channel and perceptual channel, wherein main channel is known as
P channel can also transmit signaling frame with transmitting data frame, can work on the different channels；Perceptual channel is known as channel S, only
For perceiving signaling, work on control channel Fc.
Assuming that, in order to avoid the conflict of cochannel, letter can be used in node C and D when node A and B are communicated using channel Fd1
Road Fd2 is communicated, and will not generate interference to the link of node A and B.The channel S of node A, B, C and D are shared same
Control channel Fc carries out to listen in this way other nodes on Fc channel on Fd1 as node A while data reception and sends
Signaling information, significantly reduce signaling under single-channel mode, the same channel of data sharing in this way to signaling traffic load bring
Immense pressure increases the node pair that network communicates simultaneously, reduces the interference of channel using the method for improving space reuse degree,
The utilization rate for improving channel, significantly improves network capacity.Meanwhile channel S simplify design be greatly reduced it is twin-channel hard
Part cost.
Fig. 2 describes the asymmetric Signalling exchange mode under multichannel framework.As illustrated in fig. 2, it is assumed that node A wants Xiang Jiedian
B sends business, and A must first initiate to negotiate, and determines the flow and working channel of this business.This process be by RTS frame with
For CTS frame come what is completed, negotiations process is as follows:
1) node A will send data length, recommended work channel, transmission data traffic phase according to the result of scheduler schedules
Pass information (it is here mainly modulating-coding mode, but not limited to this) group RTS frame is sent on Fc channel, and opens re-transmission
Timer t1 is then switched on data channel Fd and is received；
2) it after node B frame hears RTS frame, if being at this time with its neighbor node D communication process, does not respond,
Abandon the frame；Otherwise it switches to Fd and responds CTS frame, carry confirmation message in frame.
If 3) node A receives CTS frame, stop retransmission timer t1, otherwise switch to Fc channel, retransmits RTS
Frame.
Under traditional C/S MA mechanism, node A has sent the CTS frame for needing to wait other side after RTS frame, during this period other neighbours
Node needs to keep silent after receiving the RTS frame, sends data collision to avoid with node B, in telecommunication (>
100km), air interface transmission time > 1ms not can be carried out any signalling during this period, to cause control channel utilization rate
It reduces.And in this embodiment, any signaling frame that node is sent all be it is unidirectional, response frame is all consulting
It is transmitted on data channel, neighbor node, without keeping silent, substantially increases the letter of control channel after listening to RTS frame
Road utilization rate.
After negotiation, node A and B start to carry out data transmission on Fd1 channel.Node A starts channel after powering on
Count timer t2, when setting a length of T.The local memory of node A safeguards a channel statistical list, and list is using channel number as rope
Draw, following information is recorded in table: statistical time T interior nodes A receives the data word being successfully transmitted with transmission data frame number n, node A
The data word joint number Lt that other nodes that joint number Lr and node A are listened to are sent.Then it is calculated according to formula (1) and formula (2)
To the channel seizure ratio of each data channel.
The MAC layer of node A classifies the data packet come from network layer according to service priority, in this specific embodiment party
In formula, business is divided into high, medium and low three-level according to voice, video and Best-Effort service and enters priority query respectively.Node
The scheduler of A is scheduled queue according to priority, then by the channel occupancy statistics v of selected channel and business number to be sent
It is compared according to the priority sending threshold value v0 of packet, as v<v0, data packet will be sent, and as v>v0, data packet will be herein
It waits for a period of time in the corresponding priority query of data packet, until the data packet of high priority is sent completely, the data packet is
" channel occupancy statistics " v can be detected again, and can judgement send.
The flow chart of above procedure is as shown in figure 3, the threshold value due to high priority packets is higher than lower-priority data packet
Threshold value, in channel statistical statistical time section T, channel occupancy statistics is constantly accumulated with the transmission of data packet, reach low first
The threshold value of priority service data packet, the data packet of low priority will stop sending at this time, and the data packet of high-priority service
It can also continue to send.At the end of channel unites the period, new channel statistical window will be produced and detection obtains new letter
Road occupies statistics, and the data packet of lower service priority can reattempt to transmission at this time.It can be realized according to the algorithm to data
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-shot, it is characterised in that: each node
Have main channel and perceptual channel, main channel can send or receive, and perceptual channel can only receive, and main channel, which is in, receives shape
Perceptual channel is also at reception state when state, and perceptual channel is in IDLE state when main channel is in transmission state；When there is data
When packet needs to send, main channel is switched to transmission state and the working channel of main channel is adjusted to control letter by sending node
Road sends RTS frame, and the information carried in RTS frame includes the data channel recommended, and then main channel is switched to and connect by sending node
The working channel of main channel is simultaneously adjusted to the data channel recommended by receipts state, after receiving node listens to RTS frame, if received
Node is in communicated with other nodes during do not respond then, otherwise main channel is switched to transmission state by receiving node
And the working channel of main channel is adjusted to the data channel recommended, CTS frame is sent, carries confirmation message in CTS frame.
2. according to claim 1 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, feature
Be: 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-shot, feature
It is: before receiving node sends CTS frame, first judges whether current channel seizure ratio is lower than the priority of CTS frame to be sent
Sending threshold value: if be lower than, CTS frame is sent；Otherwise, then it is detected again after waiting the data packet of higher priority to be sent new
Channel seizure ratio, until channel seizure ratio be lower than CTS frame to be sent priority sending threshold value when just transmission CTS frame.
4. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, feature
Be: 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 formula (2)；
In formula (2), LrThe sum of data word joint number indicated by all RTS frames listened to for receiving node in control channel, lrFor
Receiving node receives the byte number that each symbol is carried under the used modulating-coding mode of data, ltNumber is sent for receiving node
According to the byte number that is carried using each symbol under modulating-coding mode, be modulating-coding used in CTS frame to be sent
Byte number under mode, t1It is each symbol in the time for eating dishes without rice or wine to occupy, LtFor receiving node send all data word joint numbers it
With, the sum for the data frame that n sends and receives for receiving node, t0For propagation delay time.
5. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, feature
Be: the priority sending threshold value of the CTS frame to be sent imported into reception by configuration file when receiving node does not power on
In node.
6. according to claim 3 based on double channel wireless radio multi Mesh network resource negotiation methods for receiving single-shot, feature
It is: priority sending threshold value service priority according to locating for CTS frame, QoS information and the CTS of the CTS frame to be sent
The patient data collision probability of frame institute obtains；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-shot, feature
It is: if sending node does not receive CTS frame within a preset time, main channel is switched into transmission state and by main channel
Working channel is adjusted to control channel, then retransmits RTS frame, then main channel is switched to reception state and by main channel
Working channel is adjusted to the data channel recommended.
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| CN107819555B (en) * | 2017-11-16 | 2021-05-11 | 江苏中科羿链通信技术有限公司 | An optimized wireless channel negotiation method |
| CN109861919B (en) * | 2018-11-26 | 2022-09-27 | 哈尔滨工程大学 | A method for determining available channels for underwater multi-channel MAC protocol |
| WO2022011714A1 (en) * | 2020-07-17 | 2022-01-20 | 北京小米移动软件有限公司 | Multi-connectivity communication method and communication device |
| CN113079108B (en) * | 2021-03-18 | 2023-05-02 | 中电科航空电子有限公司 | Method and system for improving communication efficiency of network architecture |
| 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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| US20040042424A1 (en) * | 2002-08-30 | 2004-03-04 | Hsu Hsien-Tsung | Switch method and device thru MAC protocol for wireless network |
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| CN101641917A (en) * | 2007-03-23 | 2010-02-03 | 艾利森电话股份有限公司 | Network resource negotiation |
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