CN106304134B - Based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection - Google Patents
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Abstract
The present invention relates to a kind of based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection; for heterogeneous network coexistence problems; design the coordination busy tone Preservation tactics of intelligence; cover multiple dimensions such as frequency, time, space and power; by " early warning " and " parallel protection ", one side compatible TDMA, CSMA and mixing access mechanism；On the other hand, avoid co-existin networks listens to blind zone problem, expands the information content for listening to range and network cooperation optimization of multiclass co-existin networks；Wherein, whether classification of disturbance method between the net based on disturbance decoupling can listen to other side as the criteria for classifying using disparate networks, subdomain minimum number coexists as target, avoid to mutual interference " considering the problems of excessive " or " considering not comprehensive "；" both ends rule " and " left and right rule " selection busy tone channel carries out Reasonable Protection to the weak tendency network in coexisted environment, improves the comprehensive performance of co-existin networks on the basis of low overhead interference signal feature extraction.
Description
Technical field
It is specifically a kind of based on the isomery wireless network for coordinating busy tone intelligent protection the present invention relates to radio network technique
Coexistence method is made in complexing.
Background technique
Coexisting is one of the effective means for ensureing ISM band wireless sensor network performance.According to China's National Radio
Administration committee's " technical requirements of micropower (short distance) wireless device " promulgated in 2005, wireless sensor network work
In ISM band.In addition to wireless sensor network, the wireless device for working in ISM band further includes micro-wave oven, radio frequency identification
RFID, wireless phone, bluetooth etc., the opening and shares characteristic of wireless channel make these existing equipment meetings and wireless sensor network
It interferes with each other.In addition, the application market with wireless sensor network is more and more wide, network is more and more huger and complicated, no
Frequency congestion and race problem between homogeneous network and between the homogeneous network towards different application highlight, this causes wirelessly
The certainty performance requirement of sensor network, for example, reliability, real-time, energy consumption, handling capacity etc., are faced with huge challenge.
In addition, the particularity of type of service, the complexity of network behavior, the otherness of the diversity of networking model and access mechanism, lead
Cause the performance preference of different type wireless sensor network different.Therefore, it is necessary to carry on the research of Coexistence Theory and method,
So that heterogeneous networks are under the premise of meeting respective performance requirement, harmonious coexistence.
The hot spot technology for having become the research of domestic and international wireless network coexists, is broadly divided into cooperation and coexists and coexisted with non-cooperation
Both of which.For non-cooperation coexistance model, without coordinating to interact between more nets, can only using physical layer protocol parameter airspace,
Three time domain, frequency domain aspects establish the probabilistic model of interference.For cooperating coexistance model, exists between more nets and coordinate interaction, mould
Type can further expand to the protocol parameter using data link layer.Non- cooperation coexistance model can avoid to a certain extent
Interference and conflict, but it is limited to the hoisting power of network performance.Cooperation coexistance model can preferably reduce conflict, excavate network and hold
Amount, it has also become the direction of the following symbiont techn.In addition to scholar, special working group, such as International Power have also been set up in the world
WG17 working group in committee IEC TC65 is dedicated to the research of more net symbiont techns and standard.
Cooperation coexist be with optimization method a kind of online coordination and control optimization problem, it is characterised in that coexisted environment
In multiclass network needs reach " knowing yourself as well as the enemy ", and the wireless money of occupancy is jointly controlled according to the parameter setting of underlying protocol itself
Time, frequency and the power in source.However, often facing information during cooperating the realization of coexistence method collects incomplete feelings
Condition relies on limited intercept capabilities fetching portion information between the multiclass network coexisted, realizes that " knowing yourself as well as the enemy " faces huge choose
War.Embody three problems below:
Problem 1: no-protocol compatibility.Existing IEEE 802.15.4 and 802.11 product of IEEE only realize agreement certainly
The function that body defines is not carried out the compatibility of two class agreements, therefore, can not obtain between IEEE 802.15.4 and IEEE 802.11
Mutual information is obtained, and is only capable of taking passive listening fetching portion information.
Problem 2: it listens to and is limited in scope.It includes three kinds of situations that whether two class networks, which can listen to other side: being listened to mutually
Other side, a side can listen to another party, listen to less than other side mutually.Accordingly, there exist can not listen to other side.
Problem 3: agreement differs greatly.It the radio frequency parameter of 802.11 liang of class agreements of IEEE 802.15.4 and IEEE and connects
Enter mechanism to differ greatly, and then causes access way, access frequency and the combination of turn-on time huge.In sometime point,
One side's network can not accurately hold the exact radio frequency parameter of another party's network and access mechanism.Especially existing most of IEEE
802.15.4 agreement is more using time division multiple access (Time Division Multiple Access, TDMA) and carrier sense
Road accesses the access mechanism that (Carrier Sense Multiple Access, CSMA) is combined, and IEEE 802.11 can not be into
Row is local to be distinguished.
In addition, most of agreements provide the joint access mechanism using CSMA and TDMA, this kind of random and determining combination
Transmission method increases the difficulty jointly controlled.Meanwhile causing the factor for more netting interference numerous, it is maximum with the performance of single network
It turns to target, and establishes model for single Key Influential Factors and algorithm for design is more unilateral, and comprehensively consider more net joints
Performance and numerous impact factors then face the huge problem of solution space.
Expand the information content of multiclass co-existin networks how based on going result in face of the above problem, realizes more net joints
The maximization of interests becomes problem urgently to be resolved.
Summary of the invention
It is short-sighted for non-cooperation coexistance model, limited defect is promoted to network performance, and have cooperation coexistance model
There are no-protocol compatibility, listen to be limited in scope, agreement differs greatly, turns to target etc. with the performance maximum of single network asks
Topic proposes a kind of heterogeneous wireless network cooperation coexistence method based on coordination busy tone intelligent protection, expands multiclass co-existin networks
Range and network information are listened to, the blind area of listening to of co-existin networks is covered, and does not influence the overall performance of co-existin networks；Cover frequency
Multiple dimensions such as rate, time, space and power and towards CSMA, TDMA and its mix the low overhead of access mechanism, Yi Shixian
On the one hand network coexisted access guarantees TDMA transmission qualitative requirement really, on the other hand studies the network based on CSMA mechanism such as
What waits for an opportunity to transmit and how to carry out adaptive channel detection and frequency hopping using idle opportunity.
Present invention technical solution used for the above purpose is: a kind of based on the isomery for coordinating busy tone intelligent protection
Wireless network cooperation coexistence method, comprising the following steps:
Step 1: range being listened to according to network, the interference between co-existin networks net is divided into three classes: inhibiting situation interference, punching
Prominent situation interference and mixing situation interference, and three classes interference set mutual exclusion；
Step 2: interference signal density feature being acquired according to CCA mode 2 and RSSI detection function, and carries out interference point
Analysis；
Step 3: the protocol stack for coordinating equipment CCD: CCD physical layer and medium coexists in design transmission coordination busy tone equipment
MAC layer uses the protocol stack of IEEE 802.15.4, and upper layer increases coexistence manager, from time domain, frequency domain and three, airspace
Dimension controls the transmission time for coordinating busy-back signal CBS, transmission channel, transimission power and the coordination position equipment CCD coexists
It lays；
Step 4:CSMA, TDMA and mixed mechanism adjust channel, time slot and the power of busy-back signal transmission, and arrange CCD
The position laid.
The inhibition situation interference are as follows: two class networks can mutually listen to other side, preferential to obtain the one of the channel right to use
The case where class network will inhibit the transmission of another kind of network, and another kind of network indefinite duration is caused to wait；
The conflict situations interference are as follows: two class networks can not mutually listen to other side, and transmission between the two generates conflict
The case where；
Mixing situation interference are as follows: Class A Network can unilaterally listen to class b network and whether transmit data, and one
Aspect class b network prioritised transmission will inhibit Class A Network；On the other hand, in Class A Network transmission process with the higher B class net of power
Network generates the case where conflict.
The step 2 specifically:
When CCA mode 2 returns to down IDLE value, i.e. channel idle, and RSSI value is greater than threshold value, then it represents that exist in network
802.11 signal of IEEE, specifically follows following calculating:
Wherein, I (t) indicates that t moment whether there is interference signal；If CCA_2=IDLE&RSSI > α, α are fixed for agreement
The threshold value of justice, then it represents that there are 802.11 interference signals of IEEE, and I (t) is 1 at this time；Otherwise, I (t) is 1；
The intensity for obtaining RSSI data record interference signal in real time by online mode, is denoted as f (d, t):
The CSMA mechanism are as follows: IEEE 802.15.4 equipment and 802.11 equipment of IEEE are using request transmission/removing hair
The handshake method sent negotiates transmission, after CCD equipment listens to the cts signal in network, according to cts signal, according to " two end gauages
Then " and " left and right rule " selection channel sends CBS signal, and CBS launch time, which is at least, to be returned since data transmission to receiving end
Return ACK.
It is described to send CBS signal according to " both ends rule " and " left and right rule " selection channel, specifically:
Set of available channels is analyzed, C is denoted as；
When being communicated using intermediate channels, CCD channel selection principle is defined as " both ends rule ", i.e. selection data transmission channel
Left and right sides channel；
When being communicated using marginal channels, CCD channel selection principle is defined as " left and right rule ", it may be assumed that and left edge selects right channel,
Right hand edge selects left channel；
For the multiple alternate channels that may include in set C, the selection detection the smallest channel of RSSI value.
The CBS launch time are as follows:
tCBS≥tdata+tdelay+tACK+δ
Wherein, tCBSIndicate the duration of CBS signal, tdata、tACKAnd tdelayIEEE 802.15.4 is respectively indicated to set
The interval time that standby data transmission period, ACK transmission time and the data transfer ends start to ACK, δ indicate protection surplus.
The TDMA mechanism are as follows:
Before CBS emits signal, when sending an anticipating signal first, and reserving protection between CCA and data transmission
Between δ；The selection of CBS signal channel, power and placement is identical as CSMA mechanism；By tCBSWhen time is confined to one
Gap time TslotIt is interior, it may be assumed that
Tslot> tCBS≥tdata+tdelay+tACK+δ
Wherein, tCBSIndicate the duration of CBS signal, tdata、tACKAnd tdelayIEEE 802.15.4 is respectively indicated to set
The interval time that standby data transmission period, ACK transmission time and the data transfer ends start to ACK, δ indicate protection surplus.
The mixed mechanism uses the side of transmission mode flag parameter TransmitMode join protection time δ segment processing
Method:
Under CSMA transmission mode: TransmitMode=0 and δ=0；
Under TDMA transmission mode: TransmitMode=1 and δ >=0；
Wherein, the selection of surplus δ length is protected to be arranged by user according to requirement of real-time；TransmitMod characterization is current
The transmission mode of data is defined as 0/1 variable:
The step 4 specifically:
CBS sending time is adjusted according to co-existin networks negotiation result and sends channel；
The transmission power and CCD placement of CBS are adjusted according to the interference region of co-existin networks.
The transmission power and CCD placement that CBS is adjusted according to the interference region of co-existin networks, comprising:
(1) CBS power regulation: CBS power setting be and IEEE 802.15.4 network equipment same levels；
(2) CCD placement: CCD cloth, which is placed on the IEEE 802.15.4 network equipment, can not listen to 802.11 net of IEEE
The region of network equipment.
The present invention has the following advantages and beneficial effects:
1. the method for the present invention is directed to the heterogeneous network coexistence problems based on TDMA and CSMA mechanism, by " early warning " and " simultaneously
Row protection ", one side compatible TDMA, CSMA and mixed mechanism；On the other hand, avoid co-existin networks listens to blind zone problem,
The information content for listening to range and network cooperation optimization for expanding multiclass co-existin networks, to optimize the performance of co-existin networks；
2. classification of disturbance method between the co-existin networks net that the method for the present invention proposes, according under Coexistence Situation multiclass network it is dry
Coupled relation is disturbed, other side whether can be listened to as the criteria for classifying using disparate networks, subdomain minimum number coexists as target, keep away
Exempt to mutual interference " considering the problems of excessive " or " considering not comprehensive "；
" both ends rule " and " left and right rule " that 3. the method for the present invention proposes, in the base of low overhead interference signal feature extraction
On plinth, Reasonable Protection is carried out to the weak tendency network in coexisted environment, improves the comprehensive performance of co-existin networks.
Detailed description of the invention
Fig. 1 is 802.11 network of IEEE and the network coexisted schematic diagram of IEEE 802.15.4；
Fig. 2 spectrum overlapping between heterogeneous network interferes schematic diagram；
Fig. 3 is that CCA+RSSI extracts IEEE 802.11b network signal density feature schematic diagram；
Fig. 4 is channel overlap and CBS channel selection schematic diagram；
Fig. 5 is the schematic diagram that the method for the present invention coordinates busy tone equipment；
Fig. 6 is the CBS intelligent protection under CSMA mode；
Fig. 7 is the CBS intelligent protection under TDMA mode.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
It is coexisted as shown in Figure 1 for a typical heterogeneous network (802.11 network of IEEE and IEEE 802.15.4 network)
Topological diagram.It is accessed including 1 IEEE 802.15.4 coordinator, several IEEE 802.15.4 nodes, 1 IEEE 802.11
Point (AP, Access Point) and 802.11 node of several IEEE.It wirelessly connects, defers between all kinds of nodes
Different communication protocol, such as IEEE 802.15.4 and IEEE 802.11.
Due to the open nature of wireless transmission, and 802.11 network of IEEE 802.15.4 and IEEE is generally operational in
2.4GHz frequency range.Therefore, there is the case where conflicting with each other and interfering in the data transmission between two class networks.As shown in Fig. 2, especially
It is 802.11 network of IEEE, the transmission power of nodes is stronger, and the IEEE of same frequency range low-power transmission will be completely covered
802.15.4, it transmits and fails so as to cause IEEE 802.15.4, seriously affect the performance of IEEE 802.15.4.In addition, IEEE
802.15.4 the Character Design with 802.11 protocol parameter of IEEE also brings numerous interference problems, comprising:
(1) from the dimension of time, there are problems that transmission priority is biased to: the parameter with IEEE 802.15.4 in table 1 is
Example, the switching of IEEE 802.15.4, waiting, detection and back off time are relatively long, cause IEEE 802.15.4 message etc.
To overlong time, transmission priority is lower, influences the real-time of message transmissions；
(2) from the dimension of frequency and power, there are problems that signal is flooded and seized: the opening and shares feature of ISM band is determined
Determine to interfere with each other between consolidated network difference node and between multiple networks, i.e., has been interfered between interference and net in net.Especially
It is interfered between net, the parameters such as power, bandwidth, receiving sensitivity for being defined due to various criterion are different, cause between heterogeneous networks
Disturbed condition is complex.With low rate/low-power IEEE 802.15.4 network and high-speed/high-power IEEE
For the coexisting of 802.11 networks, as shown in table 1, signal strength, bandwidth and the receiving sensitivity of IEEE 802.15.4 network
It is obviously in a disadvantageous position, for the occasion of 802.11 network-intensive of IEEE deployment, IEEE 802.15.4 wireless signal is easier quilt
" flooding " or " seizing ", influences the reliability of message transmissions；
(3) from the dimension in space, exist and overlapping region defining issue coexists: space reuse is the important side coexisted
Method.The time-varying attenuation characteristic of wireless signal, and the channels such as power and sensed threshold of listening to that different bottom standards limit are visited
The difference for surveying parameter, lead to inhomogeneity network listens to range difference, and then judges by accident and whether there is other class nets in coexisted environment
Network.
1 IEEE 802.15.4 and IEEE 802.11b/g parameter of table
| IEEE 802.15.4 | IEEE 802.11b | IEEE 802.11g | |
| Centre frequency fc | 2410MHz | 2412MHz | 2412MHz |
| Bandwidth | 2MHz | 22MHz | 22MHz |
| Transimission power | 0dBm | 17dBm | 17dBm |
| Receiving sensitivity | -85dBm | -76dBm | -82dBm |
| Transmission rate | 250kbps | 11Mbps | 6Mbps |
| Keep out of the way unit length | 320μs | 20μs | 9μs |
| Backoff window CWmin | 7 | 31 | 15 |
| Short interFrameGap SIFS | 192μs | 10μs | 10μs |
| DCF interframe space DIFS | Without definition | 50μs | 28μs |
| Clear channel assessment (CCA) CCA | 128μs | Without definition | Without definition |
| SIR threshold | 5~6dB | 5~6dB | 5~6dB |
| Tx-Rx switching time ttr | <128μs | <10μs | <10μs |
| Rx-Tx switching time trt | <128μs | <5μs | <5μs |
For problem is interfered with each other existing for heterogeneous network, one kind that the method for the present invention proposes is based on coordinating busy tone intelligently guarantor
Specific implementation step is described in detail below in conjunction with attached drawing in the heterogeneous wireless network cooperation coexistence method of shield.
Step 1: classification of disturbance between co-existin networks net.
Whether other side can be listened to according to IEEE 802.15.4 node and 802.11 node of IEEE, be divided into inhibition feelings
Condition interference, conflict situations interference and mixing situation interference, and all kinds of interference signals are stored in corresponding set.Wherein, inhibit
Situation interference set is denoted as S1；Conflict situations interference set is denoted as S2；Mixing situation interference set is denoted as S3.Three interference set
Mutual exclusion, i.e.,
(S1 ∩ S2) ∪ (S1 ∩ S3) ∪ (S2 ∩ S3)=Φ
Wherein, ∩ indicates intersection, and ∪ indicates union, and Φ indicates empty set.
Step 2: the acquisition of interference signal density feature and analysis.
As shown in figure 3, two class networks execute the CCA mode 2 and RSSI detection of CC2420, if returned under CCA mode 2
It returns IDLE value (channel idle), and when RSSI value is greater than threshold alpha, there are 802.11 signals of IEEE in network；Otherwise, in network
There is no 802.11 signals of IEEE.At this point, obtaining 802.11 signal of IEEE labeled as " mixing situation according to following formula judgement
Interference ".
Wherein, I (t) indicates that t moment whether there is interference signal；If CCA_2=IDLE&RSSI > α, then it represents that exist
802.11 interference signal of IEEE, I (t) is 1 at this time；Otherwise, I (t) is 1.
The intensity for recording interference signal, is denoted as f (d, t), in deposit mixing situation interference set.
F (d, t) specifically:
Coordination busy tone intelligent protection under step 3:CSMA and TDMA mixing access.
By taking the CCD intelligent protection towards CSMA transmission mode as an example, illustrate CBS channel selection, guard time design, power
It adjusts and the position CCD is laid.
(1) CCD protocol stack is designed
As shown in figure 5, CCD physical layer and MAC layer use the protocol stack of IEEE 802.15.4, upper layer, which increases, coexists pipe
Manage device, from the transmission (transmission time, transmission channel and transimission power) of time domain, frequency domain and airspace three dimensions control CBS with
And CCD position is laid.
(2) CBS signal is sent according to " both ends rule " and " left and right rule " suitable channel of selection
The radio-frequency information of IEEE 802.11b equipment includes: 1,6,11 3 channel of occupancy, bandwidth 20MHz, center frequency
The calculating of rate are as follows: (2.407-0.005i) GHz, i=1,6,11；
The radio-frequency information of 15.4 equipment of IEEE includes: to occupy 11-26 to amount to 16 channels, bandwidth 5MHZ, centre frequency
Calculating are as follows: (2.405-0.005k) GHz, k ∈ [11,26].
When channel set is C={ i=6, k=16/17/18/19 }, IEEE 802.11b and IEEE 802.15.4 equipment
Radio frequency overlapping as shown in figure 4, from usable set C select CBS send channel method are as follows:
1) channel selection when IEEE 802.15.4 equipment is communicated using intermediate channels:
It is communicated using channel 17, the optional channel set of CBS is { channel 16, channel 18 }；
It is communicated using channel 18, the optional channel set of CBS is { channel 17, channel 19 }.
When being communicated using intermediate channels, CBS channel selection principle is defined as " both ends rule ", that is, can choose communication
The left and right channel of channel.
The case where for being communicated using channel 18, alternative channel is { channel 17, channel 19 }, if RSSI17>
RSSI19, then channel 19 is selected to send channel as CBS.
2) channel selection when IEEE 802.15.4 equipment is communicated using marginal channels:
It is communicated using channel 16, the optional channel set of CCD is { channel 17 }；
It is communicated using channel 19, the optional channel set of CCD is { channel 18 }.
When being communicated using marginal channels, CCD channel selection principle is defined as " left and right rule ", it may be assumed that left edge selects right letter
Road, right hand edge select left channel.
(3) CBS launch time be defined as data transmission start to return to ACK to receiving end
As shown in fig. 6, according to CBS launch time tCBSDefinition and IEEE802.15.4 protocol parameter, tdata's
Maximum value is 4256 μ s (microsecond), tdelayFor 1000 μ s, tACKFor 352 μ s, (under CSMA mechanism, 0) δ is generally, then t for δ=0CBS
Value are as follows:
tCBS≥tdata+tdelay+tACK+δ
=4256+1000+352
=5608
(4) CBS power regulation
It is arranged according to IEEE 802.15.4 protocol parameter, taking CBS power setting is 0dBm.
(5) CCD placement
CCD cloth be placed on the IEEE 802.15.4 network equipment can not listen to the IEEE 802.15.4 network equipment mixing it is dry
Disturb region, it is ensured that CCD can listen to 802.11 data of IEEE.
CCD intelligent protection towards TDMA transmission mode and the only difference of CCD intelligent protection towards CSMA transmission mode
, δ > 0, and the duration of CBS is no more than the length of a time slot, as shown in Fig. 7.
Under the CCD intelligent protection of mixed transport mode, setting transmission mark
Switching for different access ways.For different access ways, above-mentioned Different Strategies and parameter setting method are used.
Claims (10)
1. a kind of based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, which is characterized in that including following
Step:
Step 1: range being listened to according to network, the interference between co-existin networks net is divided into three classes: inhibiting situation interference, conflict feelings
Condition interference and mixing situation interference, and three classes interference set mutual exclusion；
Step 2: interference signal density feature being acquired according to CCA mode 2 and RSSI detection function, and carries out interference analysis；
Step 3: the protocol stack for coordinating equipment CCD: CCD physical layer and medium access coexists in design transmission coordination busy tone equipment
Control layer uses the protocol stack of IEEE 802.15.4, and upper layer increases coexistence manager, from time domain, frequency domain and three, airspace dimension
It controls the transmission time for coordinating busy-back signal CBS, transmission channel, transimission power and laying for the coordination position equipment CCD coexists；
Step 4:CSMA, TDMA and mixed mechanism adjust channel, time slot and the power of busy-back signal transmission, and CCD is arranged to lay
Position.
2. it is according to claim 1 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is that the inhibition situation is interfered are as follows: two class networks can mutually listen to other side, preferential one kind for obtaining the channel right to use
The case where network will inhibit the transmission of another kind of network, and another kind of network indefinite duration is caused to wait；
The conflict situations interference are as follows: two class networks can not mutually listen to other side, and transmission between the two generates the feelings of conflict
Condition；
The mixing situation interference are as follows: Class A Network can unilaterally listen to whether class b network is transmitting data, one side B
The transmission of class Network Priority will inhibit Class A Network；On the other hand, it is generated in Class A Network transmission process with the higher class b network of power
The case where conflict.
3. it is according to claim 1 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the step 2 specifically:
When CCA mode 2 returns to down IDLE value, i.e. channel idle, and RSSI value is greater than threshold value, then it represents that there are IEEE in network
802.11 signals specifically follow following calculating:
Wherein, I (t) indicates that t moment whether there is interference signal；If CCA_2=IDLE&RSSI > α, α are protocol definition
Threshold value, then it represents that there are 802.11 interference signals of IEEE, and I (t) is 1 at this time；Otherwise, I (t) is 1；
The intensity for obtaining RSSI data record interference signal in real time by online mode, is denoted as f (d, t):
4. it is according to claim 1 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the CSMA mechanism are as follows: IEEE 802.15.4 equipment and 802.11 equipment of IEEE are using request transmission/clear to send
Handshake method negotiate transmission, after CCD equipment listens to the cts signal in network, according to cts signal, according to " both ends rule "
" left and right rule " selection channel sends CBS signal, and CBS launch time, which is at least, to be returned since data transmission to receiving end
ACK。
5. it is according to claim 4 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, described to send CBS signal according to " both ends rule " and " left and right rule " selection channel, specifically:
Set of available channels is analyzed, C is denoted as；
When being communicated using intermediate channels, CCD channel selection principle is defined as " both ends rule ", that is, selects a left side for data transmission channel
Right two sides channel；
When being communicated using marginal channels, CCD channel selection principle is defined as " left and right rule ", it may be assumed that left edge selects right channel, the right
Edge selects left channel；
For the multiple alternate channels that may include in set C, the selection detection the smallest channel of RSSI value.
6. it is according to claim 4 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the CBS launch time are as follows:
tCBS≥tdata+tdelay+tACK+δ
Wherein, tCBSIndicate the duration of CBS signal, tdata、tACKAnd tdelayRespectively indicate IEEE802.15.4 number of devices
According to the interval time that transmission time, ACK transmission time and the data transfer ends start to ACK, δ indicates protection surplus.
7. it is according to claim 1 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the TDMA mechanism are as follows:
Before CBS emits signal, an anticipating signal is sent first, and reserve guard time δ between CCA and data transmission；
The selection of CBS signal channel, power and placement is identical as CSMA mechanism；By tCBSWhen time is confined to a time slot
Between TslotIt is interior, it may be assumed that
Tslot> tCBS≥tdata+tdelay+tACK+δ
Wherein, tCBSIndicate the duration of CBS signal, tdata、tACKAnd tdelayRespectively indicate IEEE802.15.4 number of devices
According to the interval time that transmission time, ACK transmission time and the data transfer ends start to ACK, δ indicates protection surplus.
8. it is according to claim 7 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is that the mixed mechanism uses the side of transmission mode flag parameter TransmitMode join protection time δ segment processing
Method:
Under CSMA transmission mode: TransmitMode=0 and δ=0；
Under TDMA transmission mode: TransmitMode=1 and δ >=0；
Wherein, the selection of surplus δ length is protected to be arranged by user according to requirement of real-time；TransmitMod characterizes current data
Transmission mode, be defined as 0/1 variable:
9. it is according to claim 1 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the step 4 specifically:
CBS sending time is adjusted according to co-existin networks negotiation result and sends channel；
The transmission power and CCD placement of CBS are adjusted according to the interference region of co-existin networks.
10. it is according to claim 9 based on the heterogeneous wireless network cooperation coexistence method for coordinating busy tone intelligent protection, it is special
Sign is, the transmission power and CCD placement that CBS is adjusted according to the interference region of co-existin networks, comprising:
(1) CBS power regulation: CBS power setting be and IEEE 802.15.4 network equipment same levels；
(2) CCD placement: CCD cloth, which is placed on the IEEE 802.15.4 network equipment and can listen to 802.11 network of IEEE, to be set
Standby region.
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