CN107222929A - A kind of method for avoiding disturbing between wireless body area network - Google Patents
A kind of method for avoiding disturbing between wireless body area network Download PDFInfo
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- CN107222929A CN107222929A CN201710432724.7A CN201710432724A CN107222929A CN 107222929 A CN107222929 A CN 107222929A CN 201710432724 A CN201710432724 A CN 201710432724A CN 107222929 A CN107222929 A CN 107222929A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
- H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
- H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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Abstract
The invention discloses a kind of method for avoiding disturbing between wireless body area network, comprise the following steps：Measurement and the network interferences parameter of each node in statistics body area network；Network interferences parameter is converted into delay parameter D by telegon, further according to delay parameter D and the significant coefficient of node, asks for average delay Dp；Telegon measures the handling capacity of present channel by successful data reception, and obtains received signal strength by the power of successful data reception bag；The handling capacity and received signal strength of network are combined by telegon with average delay Dp, judge interference strength；Telegon carries out channel idle detection to channel, obtains optimal idle channel；Telegon is to all node broadcasts Frequency Hopping Signals in this body area network so that whole network is adjusted on optimal idle channel.The present invention is using the Distributed Detection of each node pair network performance parameter relevant with interference, detection and the adaptive regulation of network that realization is disturbed, solves the problem of disturbing between body area network.
Description
Technical field
The present invention relates to disturbed between body area network detect, quick preferred channels detection technique field, more particularly to one kind keeps away
The method for exempting to disturb between wireless body area network.
Background technology
With the development of wearable device, body area network also becomes more popular, while the user of body area network increases,
Also some problems are brought.It is many when in a small spatial dimension, having multiple body area network user jobs in same channel
Individual user may send information simultaneously, so as to cause the failure of information transfer, cause the decline of network performance, this phenomenon is exactly
Interference in wireless body area network between body area network.The odjective cause that this interference is produced has two, is that number of channels available has first
Limit, IEEE802.15.4 defines 26 channels altogether, and it only has 16 in 2.4GHZ channel, therefore channel quantity has
Limit, so the possibility that multiple body area network users are in same channel is very big；Next to that when multiple in same channel
When user is gathered in a small space, the information of its network delivery can by the body area network user of surrounding other cochannels shadow
Ring, this influence is inevitable.Therefore try every possible means to mitigate this interference, and the performance of body area network is remained at normally
It is the research emphasis of wireless body area network interference in the range of work.
Traditional interference avoidance technique can not be adapted to body area network, and the interference of the technology such as wifi is one static dry
Disturb, and the interference between body area network is one dynamic, the channel circumstance moment of surrounding is changing；Body area network and traditional communication network
Network is different, and body area network does not have the central adjusting device of similar base station, can one region of macroscopic view regulation channel distribution, prevent
Interference, it is therefore desirable to which network self-adapting is adjusted；In addition, the more existing channel search strategy for body area network is time-consuming serious,
Interference can be allowed to produce lasting influence to body area network, thus we the characteristics of need to be disturbed according to body area network one interference of design keep away
Exempt from algorithm and allow it quickly to recover normal from interference.
The content of the invention
In order to overcome the shortcoming and deficiency that prior art is present, the present invention, which is provided, a kind of avoids what is disturbed between wireless body area network
Method, solves the interference problem of dynamic environment, and the problem of network self-adapting is adjusted and the recovery that is interfered are normal time-consuming tight
The problem of weight.
In order to solve the above technical problems, the present invention provides following technical scheme：It is a kind of to avoid what is disturbed between wireless body area network
Method, comprises the following steps：
S1, measurement and the network interferences parameter of each node in statistics body area network, and network interferences parameter is sent to association
Adjust device；
The network interferences parameter of reception is converted into delay parameter D by S2, telegon, further according to each node in body area network
Delay parameter D and node significant coefficient, ask for average delay Dp；
S3, telegon measure handling up for the whole network of present channel by successful data reception in its unit interval
Amount, and received signal strength is obtained by the power of successful data reception bag；
The handling capacity and received signal strength of network are combined by S4, telegon with average delay Dp, judge interference strength；
Wherein, network throughput is lower, then average delay Dp is bigger, and the interference being subject to is stronger, therefore when average delay Dp exceedes necessarily
Value and handling capacity it is low arrive certain value when, then judge interference especially severe；When judging interference strength, if subjected to interference it is tight
Weight, then into next step S5, otherwise return to step S1；
S5, telegon carry out channel idle detection to channel, repeat detection n wheels, and each round detection is required for k channel
In one detected, by the order of algorithm reasonable arrangement Channel Detection, quickly obtain optimal idle channel；
S6, telegon change frequency to optimal idle channel to all node broadcasts Frequency Hopping Signals in this body area network
Residing frequency so that whole network is adjusted on optimal idle channel, is then back to step S1 and carries out loop cycle.
Further, the network interferences parameter of the step S1 includes keeping out of the way number of times and number of retransmissions.
Further, the delay parameter D of the step S2 and average time delay D p, its calculation is：
The characteristics of wherein delay parameter D make use of non-slot CSMA/CA, calculates according to below equation and obtains：
In formula, nb represents the number of times of keeping out of the way in CSMA/CA agreements, WnbRepresent contention window size, TslotRepresent that unit is moved back
The slot length kept away；The formula is used to calculate one when backoff state is nb and average keeps out of the way time-consuming；
In formula,Represent average and keep out of the way number of times,Number of retransmissions is represented, N represents maximum allowable and keeps out of the way number of times；The formula
Represent to keep out of the way number of times and average repeat time using being averaged for node transmission, estimation obtains the average delay D of the node-node transmission；
In formula, αiThe significant coefficient of node i is represented, k represents total nodes；Consider the important of each node of whole network
Property, obtain the overall average delay D based on node priority of networkp。
Further, in the step S4, when judging interference strength, determine whether seriously to be done using threshold method
Disturb, it is specially：When handling capacity is less than throughput threshold, average delay is higher than the threshold value of average delay, and received signal strength
More than received signal strength threshold value when, it is believed that the serious interference being subject to；The data volume that telegon is sent according to each node of network
To determine the threshold value of handling capacity and average time delay D p threshold value, telegon determines the network throughput T under noiseless, setting system
Number α, the threshold value of handling capacity is used as using α × T；Telegon determines average delay Dpt noiseless under, setting factor beta, with β ×
Dpt as average delay Dpt threshold value；Unobstructed lower received signal strength value is tested for rssi1, single barrier is tested and blocks
Under received signal strength value be rssi2, set the threshold value of received signal strength as rssi1- γ × rssi1+ γ × rssi2,
Coefficient gamma ∈ [0,1] is body area network to the tolerance blocked.
Further, the step S5, be specially：
S51, telegon set total Channel Detection wheel number as n and total detection number of channel k, initialize each channel
It is chosen the average reward of number of times and each channel；
S52, in each round detection, telegon randomly chooses channel with ε probability and carries out channel idle detection, with 1-
The channel that the ε current average reward of probability selection is maximum carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, the selected number of times of channel adds 1, channel it is total
Reward plus R1；If channel idle testing result is busy, the selected number of times of channel adds 1, and total reward of channel adds R2；
S54, cycle detection, until the n-th wheel has been detected, are then finally used as the optimal free time using average reward highest channel
Channel.
Further, the channel idle detection in the step S5 is the energy by judging channel signal, if channel is believed
Number energy be less than threshold value, then it is assumed that channel is idle, and otherwise channel is busy.
After adopting the above technical scheme, the present invention at least has the advantages that：
1st, body area network is different from other wireless networks, have some its it is unique the characteristics of, traditional inter-network interference is avoided
Method, it is impossible to the characteristics of meeting the mobility of body area network, and mobile phone mobile network is distributed unitedly by base station and managed, this is in body domain
It is difficult in net；Therefore, it is adaptively adjusted the invention enables body area network, by current collected by each node and telegon
The information of the body area network network index relevant with interference, to determine whether to be interfered, then carries out Channel assignment and switching, institute
Some operations are completed by network itself, with real-time and adaptivity；
2nd, the detection of channel is each Channel Detection regular time in existing hop algorithm, so average detection,
Many times will be wasted in the detection of the channel of difference, and in Channel Detection, network can not communicate, therefore, detection letter
Road is time-consuming longer, and the loss to body area network data is bigger, influences bigger；Model of the invention by setting up preferred channels detection,
With the idleness of channel as the judging basis of channel quality, optimal channel is quickly found out by setting up model and algorithm, is made
The fast quick-recovery proper communication of body area network is obtained, and keeps high-throughput and low time delay.
Brief description of the drawings
Fig. 1 is a kind of step flow chart for the method for avoiding disturbing between wireless body area network of the present invention.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combine, the application is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in figure 1, the invention provides a kind of method for avoiding disturbing between wireless body area network, its step is specially：
Each node measurement performance parameter relevant with network interferences with statistics in S1, body area network (including keep out of the way number of times with
Number of retransmissions), and send it to telegon；
S2, telegon receive the network interferences parameter of each node in network, are translated into delay parameter D, further according to
The time delay of each node and the significant coefficient of node obtain average network delay Dp；
S3, telegon obtain handling up for the whole network of present channel by the data volume being properly received in its unit interval
Amount, RSSI (the Received Signal Strength that signal is received are obtained by the power for the packet being properly received
Indication received signal strengths)
The handling capacity and RSSI of network are combined by S4, telegon with the time delay of network, judge interference strength；Network throughput
Amount it is lower, network delay is bigger, and the interference being subject to is stronger, thus when time delay greatly arrive more than certain value and handling capacity it is low arrive certain value
When, it is believed that interference especially severe, serious interference can be determined whether by threshold method, if subjected to serious interference, into next
Step S5, otherwise returns to step S1；
S5, telegon circulation perform some wheels of procedure below to search preferred channels：
S51, telegon setting total Channel Detection wheel number n and total detection number of channel k, initialize the quilt of each channel
Select the average reward of number of times and each channel；
S52, each round detection, telegon randomly chooses a channel with ε probability and carries out channel idle detection, with 1- ε's
The maximum channel of the current average reward of probability selection carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, the selected number of times of channel adds 1, channel
Total reward plus R1；If channel idle testing result is busy, the selected number of times of channel adds 1, and total reward of channel adds R2；
S54, be continued until it is some wheel detected, then optimal channel is finally used as using average reward highest channel；
S6, telegon allow whole network to be adjusted to new idle letter to all node broadcasts tone hopping informations of the body area network
On road, return to step S1 and carry out loop cycle.
In order that data accuracy, operate above-mentioned steps the invention provides specific example, specially：
S1, sensor node use CC2530 chips, transplant TinyOS operating systems, sensor node gathered data, often
The packet that a size is 100 bytes is transmitted to telegon every 20ms, transmission rate is 40kbps.Set in CSMA/CA most
Big random back times N Bmax is 3, and minimum index avoidance BEmin is 2, and maximum index avoidance is 5, often transmits a data
Wrap and add the value for keeping out of the way number of times and number of retransmissions of two bytes at end；
S2, telegon obtain the average delay Dp of body area network using calculating formula 1 and calculating formula 2；
Calculating formula 1：
Calculating formula 2：
S3, telegon count the handling capacity T of whole body area network and receive the intensity RSSI of signal；
S4, delay threshold is set as Dthreshold=15ms, handling capacity delay threshold is Tthreshold=28packets,
RSSI threshold value RSSIthresholdFor RSSI proper communication value -60dB, telegon judges whether handling capacity T>Tthreshold＆＆ time delays
Dp>Dthreshold&&RSSI>RSSIthresholdIf the above results are true, judge body area network by serious cochannel body domain
Interference between net, into next step S5；Otherwise, step S1 is returned to；
S5, exploration channel is set as 3, total detection wheel number is 300, and often wheel performs a channel idle detection, and often wheel consumes
When for 8 common 128us of byte, total detection time be 38ms, initialize the selected number of times of each channel and putting down for each channel
Reward is 0；Each round detects that telegon randomly chooses a channel with 0.1 probability and carries out channel idle detection, with 0.9
The maximum channel of the current average reward of probability selection carries out channel idle detection；If selected channel idle testing result is sky
Spare time, then the selected number of times of channel add 1, total reward of channel adds 1；If channel idle testing result is busy, channel
Selected number of times adds 1, and the always reward of channel is constant；It is continued until that 300 wheels have been detected, then final average reward highest channel
For most idle channel；
S6, telegon allow whole network to be adjusted to new idle letter to all node broadcasts tone hopping informations of the body area network
On road, return to step S1 and carry out loop cycle.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understand, can carry out a variety of equivalent changes to these embodiments without departing from the principles and spirit of the present invention
Change, change, replace and modification, the scope of the present invention is limited by appended claims and its equivalency range.
Claims (6)
1. a kind of method for avoiding disturbing between wireless body area network, it is characterised in that comprise the following steps：
S1, measurement and the network interferences parameter of each node in statistics body area network, and network interferences parameter is sent to telegon；
The network interferences parameter of reception is converted into delay parameter D by S2, telegon, further according in body area network each node when
Prolong the significant coefficient of parameter D and node, ask for average delay Dp；
S3, telegon measure the handling capacity of the whole network of present channel by successful data reception in its unit interval, and
Received signal strength is obtained by the power of successful data reception bag；
The handling capacity and received signal strength of network are combined by S4, telegon with average delay Dp, judge interference strength；Its
In, network throughput is lower, then average delay Dp is bigger, and the interference being subject to is stronger, therefore when average delay Dp exceedes certain value
And handling capacity it is low arrive certain value when, then judge interference especially severe；When judging interference strength, if subjected to serious interference,
Then enter next step S5, otherwise return to step S1；
S5, telegon carry out channel idle detection to channel, repeat detection n wheels, and each round detection is required in k channel
One is detected, by the order of algorithm reasonable arrangement Channel Detection, quickly obtains optimal idle channel；
S6, telegon change residing for frequency to optimal idle channel to all node broadcasts Frequency Hopping Signals in this body area network
Frequency so that whole network is adjusted on optimal idle channel, is then back to step S1 and carries out loop cycle.
2. a kind of method for avoiding disturbing between wireless body area network according to claim 1, it is characterised in that the step S1
Network interferences parameter include keep out of the way number of times and number of retransmissions.
3. a kind of method for avoiding disturbing between wireless body area network according to claim 1, it is characterised in that the step S2
Delay parameter D and average time delay D p, its calculation is：
The characteristics of wherein delay parameter D make use of non-slot CSMA/CA, calculates according to below equation and obtains：
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In formula, nb represents the number of times of keeping out of the way in CSMA/CA agreements, WnbRepresent contention window size, TslotRepresent what unit was kept out of the way
Slot length；The formula is used to calculate one when backoff state is nb and average keeps out of the way time-consuming；
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In formula,Represent average and keep out of the way number of times,Number of retransmissions is represented, N represents maximum allowable and keeps out of the way number of times；The formula represents profit
Keep out of the way number of times and average repeat time with being averaged for node transmission, estimation obtains the average delay D of the node-node transmission；
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In formula, αiThe significant coefficient of node i is represented, k represents total nodes；Consider the importance of each node of whole network, obtain
The overall average delay D based on node priority of networkp。
4. a kind of method for avoiding disturbing between wireless body area network according to claim 1, it is characterised in that the step S4
In, when judging interference strength, determined whether using threshold method heavily disturbed, it is specially：Handled up when handling capacity is less than
Measure threshold value, average delay be higher than average delay threshold value, and received signal strength be more than received signal strength threshold value when, it is believed that
The serious interference being subject to；Telegon determines the threshold value and average time delay D p of handling capacity according to the data volume of each node transmission of network
Threshold value, telegon determines network throughput T noiseless under, and setting factor alpha is used as the threshold value of handling capacity using α × T；Association
Adjust device to determine the average delay Dpt under noiseless, set factor beta, average delay Dpt threshold value is used as using β × Dpt；Test
Unobstructed lower received signal strength value is rssi1, and the received signal strength value tested under single barrier is blocked is rssi2, if
The threshold value for determining received signal strength is rssi1- γ × rssi1+ γ × rssi2, and coefficient gamma ∈ [0,1] is body area network to blocking
Tolerance.
5. a kind of method for avoiding disturbing between wireless body area network according to claim 1, it is characterised in that the step
S5, be specially：
S51, telegon set total Channel Detection wheel number as n and total detection number of channel k, initialize the selected of each channel
Select the average reward of number of times and each channel；
S52, in each round detection, telegon randomly chooses channel with ε probability and carries out channel idle detection, with 1- ε's
The maximum channel of the current average reward of probability selection carries out channel idle detection；
If the channel idle testing result of S53, selected channel is the free time, the selected number of times of channel adds 1, total reward of channel
Plus R1；If channel idle testing result is busy, the selected number of times of channel adds 1, and total reward of channel adds R2；
S54, cycle detection, until the n-th wheel has been detected, then it is final that optimal free time letter is used as using average reward highest channel
Road.
6. a kind of method for avoiding disturbing between wireless body area network according to claim 1 or 5, it is characterised in that the step
Channel idle detection in rapid S5 is the energy by judging channel signal, if the energy of channel signal is less than threshold value, is recognized
It is idle for channel, otherwise channel is busy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710432724.7A CN107222929B (en) | 2017-06-09 | 2017-06-09 | A method of it avoids interfering between wireless body area network |
Applications Claiming Priority (1)
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