CN103874172B - Data transmission method and system in wireless body area network - Google Patents
Data transmission method and system in wireless body area network Download PDFInfo
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- CN103874172B CN103874172B CN201210546312.3A CN201210546312A CN103874172B CN 103874172 B CN103874172 B CN 103874172B CN 201210546312 A CN201210546312 A CN 201210546312A CN 103874172 B CN103874172 B CN 103874172B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides the data transmission method in a kind of wireless body area network and system.Methods described includes：Wake up from node；The request of data frame uploaded from node of the wake-up is received, statistics frame is generated according to the request of data frame, and be issued to from node；The upload data from node are received, the upload data are according to the transmitting scheduling information in the statistics frame.The system includes：Including network coordinator, the network coordinator includes：Waking up nodes module, for waking up from node；Scheduler module, for receiving the request of data frame uploaded from node of the wake-up, statistics frame is generated according to the request of data frame, and be issued to from node；Data processing module, for receiving the upload data from node, the upload data are according to the transmitting scheduling information in the statistics frame.Efficiency can be improved using the present invention and shorten the wait time delay of data in superframes.
Description
Technical field
The present invention relates to human body communication technology, more particularly to the data transmission method in a kind of wireless body area network and is
System.
Background technology
Wireless body area network is the communication network carried out data transmission using human body as communication channel.In traditional wireless body area network
In, mainly using the protocol realization group-net communication such as bluetooth, Zigbee.Assisted applied to the bluetooth in wireless body area network, Zigbee etc.
View is all based on wide coverage, can carry out the multistage cluster tree network of multi-hop these factor designs, and wireless body area network is big
All it is hub-and-spoke configuration, one jumps the transmission that can complete data, therefore, passes through the wireless body area of the protocol realizations such as bluetooth or Zigbee
Net is excessively complicated, for Star Network simple in construction, it is often necessary to and expend excessive resource and handle unnecessary details,
The defects of efficiency is low in wireless body area network is in turn resulted in.
The content of the invention
Based on this, it is necessary to for efficiency in wireless body area network it is low the defects of problem, there is provided a kind of nothing that can improve efficiency
Data transmission method in line body area network.
In addition, it there is a need to the data transmission system provided in a kind of wireless body area network that can improve efficiency.
A kind of data transmission method in wireless body area network, comprises the following steps：
Wake up from node；
The request of data frame uploaded from node of the wake-up is received, statistics frame is generated according to the request of data frame, and
It is issued to from node；
The upload data from node are received, the upload data are according to the transmitting scheduling information in the statistics frame
's.
In one of the embodiments, the step of wake-up node is：
Beacon frame is sent from node into wireless body area network, the beacon frame includes source address and time synchronization information.
In one of the embodiments, also include after the step of wake-up node：
The beacon frame received is read, whether the source address for judging to record in the beacon frame is ground where network coordinator
Location, if so, then
The extraction time synchronizing information from the beacon frame, and time synchronized is carried out according to the time synchronization information.
In one of the embodiments, in addition to：
Pass through the transmission triggering timing of the beacon frame；
Judge whether time that the timing obtains reaches the super frame period of setting, if so, then
Return it is described into wireless body area network from node send beacon frame the step of.
In one of the embodiments, in addition to：
Emergency data claim frame is received, interrupts the transmission for uploading data or wait being distributed under the request of data frame
Finish, receive the emergency data uploaded from node for initiating emergency data claim frame.
In one of the embodiments, in addition to：
Make completion upload data transfer enters resting state from node.
A kind of data transmission system in wireless body area network, including network coordinator, the network coordinator include：
Waking up nodes module, for waking up from node；
Scheduler module, for receiving the request of data frame uploaded from node of the wake-up, according to the request of data frame
Statistics frame is generated, and is issued to from node；
Data processing module, for receiving the upload data from node, the upload data are according to the statistics
Transmitting scheduling information in frame.
In one of the embodiments, the waking up nodes module is additionally operable to send letter from node into wireless body area network
Frame is marked, the beacon frame includes source address and time synchronization information.
In one of the embodiments, it is described to include from node in addition to from node：
Read module, for reading the beacon frame received, whether the source address for judging to record in the beacon frame is network
Address where telegon, if so, then notifying time synchronized module；
The time synchronized module is used for the extraction time synchronizing information from the beacon frame, and according to the time synchronized
Information carries out time synchronized.
In one of the embodiments, the network coordinator also includes：
Timer, for the transmission triggering timing by the beacon frame, and judge whether the time that timing obtains reaches
The super frame period of setting, if so, then notifying the waking up nodes module.
In one of the embodiments, the network coordinator also includes：
Emergent management module, for receiving emergency data claim frame, interrupt described in the transmission or wait for uploading data
Request of data frame, which issues, to be finished, and receives the emergency data uploaded from node for initiating flash request frame.
In one of the embodiments, the node also includes：
Sleep block, enter resting state after the transmission for upload data to be done.
Data transmission method and system in above-mentioned wireless body area network, waking up after node by request of data frame and
The statistics frame issued has been implemented in combination with the orderly control uploaded to node, the data carried out according to the schedule information in statistics frame
Upload meets each upload demand from node in wireless body area network, also ensure that the order that data upload, realizes pair
Comprehensive control of data transfer in wireless body area network, and then avoid the feelings such as data upload requests repeating transmission caused by contention protocols
The energy expended under condition, improves efficiency.
Brief description of the drawings
Fig. 1 is the flow chart of the data transmission method in wireless body area network in one embodiment；
Fig. 2 is the structural representation of beacon frame in one embodiment；
Fig. 3 is the method flow diagram that node is waken up in Fig. 1；
Fig. 4 is the structural representation of request of data frame in one embodiment；
Fig. 5 is the structural representation of statistics frame in one embodiment；
Fig. 6 is the structural representation of data frame in one embodiment；
Fig. 7 is the flow chart of the data transmission method in wireless body area network in another embodiment；
Fig. 8 is the divided stages schematic diagram of super frame period in one embodiment；
Fig. 9 is the structural representation of the data transmission system in wireless body area network in one embodiment；
Figure 10 is the structural representation of the data transmission system in wireless body area network in another embodiment.
Embodiment
As shown in figure 1, in one embodiment, the data transmission method in a kind of wireless body area network, comprise the following steps：
Step S110, wake up from node.
In the present embodiment, dormancy shape will be in when not carrying out and uploading the transmission of data from node in wireless body area network
State, to reduce the efficiency from node by this low-power consumption mode.In the upload data transfer in carrying out wireless body area network, need
Wake up in a dormant state from node, and then cause transferred out from the data in node.
In one embodiment, above-mentioned steps S110 detailed process is：Being sent from node into wireless body area network is believed
Frame is marked, the beacon frame includes source address and time synchronization information.
In the present embodiment, using human body as in the wireless body area network of communication channel, medium access control (medium
Access control, abbreviation MAC) agreement determines the occupation mode of human body communication channel, limited from being distributed between node
Human body communication channel resource, build the underlying basis structure of wireless body area network, therefore for wireless body area network, medium is visited
The data transmission mechanism that MAC layer where asking control protocol is applied will produce very big shadow to the performance of wireless body area network
Ring, be one of key for ensureing wireless body area network efficient communication.
The wake-up carried out from node in a dormant state can be realized by the transmission of beacon frame.Beacon frame is used to call out
Wake up from node, and the time synchronized established in wireless body area network, wherein, the source address in beacon frame, which is used to identify, sends beacon frame
Device whether be network coordinator, time synchronization information is then that the foundation of time synchronized is carried out in wireless body area network.
In one embodiment, the structure of beacon frame includes frame type, mesh as shown in Fig. 2 beacon frame can be 7 bytes
Address, source address, time synchronization information and check code.Wherein, frame type is 1 byte, and corresponding field, which will identify, to be worked as
Previous frame is beacon frame；Destination address is received beacon frame from node address, has corresponded to 1 byte；Check code is 2 bytes,
For ensureing the integrality of frame.
In another embodiment, beacon frame is sent by network coordinator timing, periodically into wireless body area network
Beacon frame is sent from node.Specifically, periodically waking up network coordinator, the transmitter module in opening network telegon is sent
Beacon frame, and realized by beacon frame and time synchronized is carried out from node to the whole network.
To implement with ensureing the data transfer effective in wireless body area network, will be carried out in time by super frame period
Management and control.Super frame period is the default period, is all data transfer cycles from node in wireless body area network.Network coordinator
It will control and complete in super frame period to wake up to the process for transmitting data from node, and meet in current super frame period each
From the data transfer demands of node.Starting stage of the beacon frame from network coordinator in super frame period sends to from node.
As shown in figure 3, in one embodiment, also include after above-mentioned steps S110：
Step S210, the beacon frame of reception is read, whether the source address for judging to record in beacon frame is network coordinator institute
Address, if so, then entering step S230, if it is not, then entering step S250.
In the present embodiment, in wireless body area network from node after received beacon frame, by read obtain in beacon frame
Source address and time synchronization information, and then whether the equipment for judging to send beacon frame is network coordinator, if so, being then in dormancy
State is waken up from node, and carries out time synchronized according to the time synchronization information for reading to obtain from beacon frame, if judging
Source to beacon frame is not network coordinator, then keeps resting state.
Step S230, the extraction time synchronizing information from beacon frame, and time synchronized is carried out according to time synchronization information.
In the present embodiment, in wireless body area network it is each from node according to transmitted by network coordinator time synchronized believe
Breath carries out time synchronized, is synchronous to cause in wireless body area network from the time of node.
Step S250, stays in resting state.
Step S130, the request of data frame uploaded from node of wake-up is received, statistics frame is generated according to request of data frame, and
It is issued to from node.
In the present embodiment, what is be waken up will calculate in the current super frame cycle from node according to current data transfer demands
The number of time slot needed for data is passed, the time data is packaged into request of data frame, and upload to by pre-assigned time slot
In network coordinator, multiple fair uploads from node in wireless body area network ensure that by request of data frame.
In one embodiment, as shown in figure 4, request of data frame can be 6 bytes, including frame type, destination address, source
Location, time slot request number and check code.Wherein, frame type is 1 byte, and corresponding field will identify present frame please for data
Seek frame；Destination address is 1 byte, is network coordinator address；Source address is 1 byte, be send request of data frame from
Node address；Time slot request number is 1 byte, is to upload the timeslot number needed for data from node in the current super frame cycle
Mesh；Check code is 2 bytes, for ensureing the integrality of request of data frame.
Network coordinator switchs to reception pattern by sending mode, the request of data frame uploaded from node is received, and by number
According to the number of time slot in claim frame and the corresponding storage of corresponding node identification.
Further, reception to data claim frame carries out timing, whether judges to receive time that request of data frame expends
Reach default time limit value, if so, then will not receive time slot data corresponding to node identification corresponding to request of data frame
It is designated as zero, it is believed that it should need not carry out data transmission from node, still in resting state, if not up to default time limit value,
Then continue the reception of request of data frame.
The reception of control data claim frame in time of passage time limit value will ensure that in wireless body area network to exist from node
The transmission of data is completed in super frame period.
After request of data frame receives, the number of time slot corresponding to node identification will be counted, to know
The whole network generates schedule information from all slot requirements of node, and according to statistical result, and the schedule information of generation is packaged into system
The form of meter frame is handed down to each from node in wireless body area network.Schedule information in statistics frame is used to distribute the work from node
Make time and dormancy time, immediately feed back the actual data transfer demands of current network, and realize Real-Time Scheduling.
As shown in figure 5, statistics frame is 7+2N bytes, including frame type, destination address, source address, total number of time slot, node
Mark and its time slot, check code.Wherein, frame type is 1 byte, and it is request of data that corresponding field, which will identify present frame,
Frame；Destination address is 1 byte, is from node address in wireless body area network；Source address is 1 byte, is network coordinator institute
In address；Total number of time slot is 2 bytes, is that network coordinator counts obtained wireless body area network according to the request of data frame of reception
All slot requirements；Node identification and its time slot are 2N bytes, node identification and its time slot be the node identification it is corresponding from
The schedule information of node, according to the time slot of record will upload the transmission of data from node.
Step S150, the upload data from node are received, the upload data are according to the transmitting scheduling information in statistics frame
's.
In the present embodiment, from node after the schedule information issued is received, by according to recorded in schedule information when
Gap carries out the upload of data.In the presence of schedule information, the time slot of the node distribution in wireless body area network uploads data in order,
It effectively prevent node to exclude to upload data, and then shorten the queuing delay of data.
It is 128 bytes as shown in fig. 6, the data uploaded are packaged into the form of data frame, including frame type, destination
Location, source address, frame number, frame data and check code.Wherein, frame type is 1 byte, and corresponding field will identify present frame
For data frame；Destination address is 1 byte, is network coordinator address；Source address is 1 byte, is node address；Frame
The byte of data 122, it is the data of upload required for node.
As shown in fig. 7, in another embodiment, the data transmission method in above-mentioned wireless body area network also includes：
Step S310, pass through the transmission triggering timing of beacon frame.
In the present embodiment, triggering progress timing while beacon frame is sent, time statistics is carried out by starting of beacon frame.
Step S330, judges whether time that timing obtains reaches the super frame period of setting, if so, then return to step
S110, if it is not, then return to step S310.
In the present embodiment, the superframe week for whether having reached setting using beacon frame as the time that starting progress timing obtains is judged
Phase, if so, then illustrating that the data transfer that wireless body area network is carried out completes a cycle, node needs to wait next superframe week
The time slot distribution of phase can carry out the transmission of data again, if it is not, then continuing timing.
In another embodiment, the data transmission method of above-mentioned wireless body area network also includes：Receive emergency data request
Frame, interrupt the transmission for uploading data or wait request of data frame to issue and finishing, receive initiate emergency data claim frame from node
The emergency data of upload.
It is inevasible that some urgent progress of data needs occur in the data transfer of wireless body area network in the present embodiment
The situation of upload, when receiving emergency data claim frame, if carrying out the upload of data, the upload of data is interrupted, and
Carry out the upload of emergency data so that emergency data can be transmitted in time, if carrying out data in wireless body area network
Claim frame issues, then need wait request of data frame issue finish after upload emergency data again.
In one embodiment, after the upload of data is completed, for the data of upload, integrality inspection will be carried out
Look into.Judge whether the data of upload are complete, if it is not, then the loss of data occurs for explanation, by the inactive phase in super frame period
Start retransmission mechanism, and there occurs point-to-point re-transmission is carried out from node corresponding to loss of data, if so, then entirely without wire body
Domain net will enter resting state, to wait the arrival of next super frame period.
In another embodiment, the data transmission method of above-mentioned wireless body area network also includes：Make completion upload data to pass
It is defeated from node enter resting state the step of.
In the present embodiment, complete that after data upload resting state will be entered from node, to reduce power consumption.
Using network coordinator as host node, wireless body area network is constituted from node with multiple, and beacon frame, request of data
Frame, statistics frame and data frame are also constituted for realizing the superframe of data transfer in wireless body area network, and pass through request of data
Frame has fed back each data transfer demands from node to master node network telegon exactly, meanwhile, statistics frame is super at one
Immediate feedback is carried out to data claim frame in frame, significantly shortens and wait of the transmission of data on superframe is uploaded from node
Time delay.
Data transmission method in above-mentioned wireless body area network realizes the cyclical transmission of data, such as Fig. 8 according to super frame period
It is shown, in the super frame period set by above-mentioned wireless body area network, include for network coordinator according to sequencing
Five stages, the i.e. transmission phase of beacon frame, the reception stage of request of data frame, statistics frame generation and issue stage, data
The reception stage and inactive phase of frame, wherein, the inactive phase is reserved for the re-transmission of data frame.
Data transmission method in above-mentioned wireless body area network carries out data management by network coordinator to node, can apply
In medical field, such as the application of physiological parameter acquisition and the monitoring state of an illness, and due to competitive agreement need not be used to obtain
The time slot transmission route of data, so as to ensure that node obtains the authority of upload data in time, to upload emergency medical data.
Further, since network coordinator can obtain all data transfer demands in wireless body area network, therefore energy completely
Enough scheduling mechanisms the most rational cause node to complete data transfer with the cost of minimum, so as to realize low-energy-efficiency, further, since
Competitive agreement need not be used to obtain the time slot transmission route of data and avoid the generation of frame collision, create a further reduction energy
Effect.
As shown in figure 9, in one embodiment, the data transmission system in a kind of wireless body area network, network coordinator 10,
The network coordinator 10 includes waking up nodes module 110, scheduler module 130 and data processing module 150.
Waking up nodes module 110, for waking up from node.
In the present embodiment, in wireless body area network will in a dormant state, to pass through this when not uploading data from node
One low-power consumption mode reduces the efficiency from node.In the data transfer in carrying out wireless body area network, it is necessary to waking up nodes module
110 wake up in a dormant state from node, and then cause transferred out from the data in node.
In one embodiment, above-mentioned waking up nodes module 110 is additionally operable to send letter from node into wireless body area network
Frame is marked, the beacon frame includes source address and time synchronization information.
In the present embodiment, using human body as in the wireless body area network of communication channel, media access control protocol determines people
The occupation mode of body communication channel, from limited human body communication channel resource is distributed between node, build wireless body area network
Underlying basis structure, therefore for wireless body area network, the data that the MAC layer where media access control protocol is applied pass
Defeated mechanism will produce very big influence to the performance of wireless body area network, be the key for ensureing wireless body area network efficient communication
One.
The wake-up carried out from node in a dormant state can be realized by the transmission of beacon frame.Beacon frame is used to call out
Wake up from node, and the time synchronized established in wireless body area network, wherein, the source address in beacon frame, which is used to identify, sends beacon frame
Device whether be network coordinator 10, time synchronization information is then that the foundation of time synchronized is carried out in wireless body area network.
Beacon frame can be 7 bytes, include frame type, destination address, source address, time synchronization information and check code.Its
In, frame type is 1 byte, and it is beacon frame that corresponding field, which will identify present frame,；Destination address for received beacon frame from
Node address, 1 byte is corresponded to；Check code is 2 bytes, for ensureing the integrality of frame.
In another embodiment, beacon frame is sent by the timing of waking up nodes module 110, periodically to wireless body area network
In from node send beacon frame.Specifically, periodically waking up waking up nodes module 110, beacon frame is sent, and pass through beacon
Frame is realized carries out time synchronized to the whole network from node.
To implement with ensureing the data transfer effective in wireless body area network, will be carried out in time by super frame period
Management and control.Super frame period is the default period, is all data transfer cycles from node in wireless body area network.Network coordinator
10 will control the process for completing to wake up to transmission data in super frame period from node, and meet often in current super frame period
One from the data transfer demands of node.Beacon frame from from waking up nodes module 110 super frame period starting stage to from node
Send.
As shown in Figure 10, in one embodiment, the data transmission system in above-mentioned wireless body area network also includes and network
Telegon 10 carries out some from node 30 of data interaction, should include read module 310 and time synchronized module from node 30
330。
Read module 310, for reading the beacon frame received, whether the source address for judging to record in beacon frame is network association
The address where device 10 is adjusted, if so, time synchronized module 330 is then notified, if it is not, then staying in resting state.
In the present embodiment, in wireless body area network from node 30 after received beacon frame, read module 310 will be read
Source address and time synchronization information into beacon frame, and then whether the equipment for judging to send beacon frame is network coordinator 10,
If so, then being waken up from node 30 in a dormant state, time synchronized module 330 according to read to obtain from beacon frame when
Between synchronizing information carry out time synchronized, if the source for determining beacon frame is not network coordinator 10, keep dormancy
State.
Time synchronized module 330, carried out for the extraction time synchronizing information from beacon frame, and according to time synchronization information
Time synchronized.
In the present embodiment, each from node 30 in wireless body area network, time synchronized module 330 is according to the network coordination
Time synchronization information transmitted by device 10 carries out time synchronized, is synchronous to cause in wireless body area network from the time of node 30
's.
Scheduler module 130, for receiving the request of data frame uploaded from node waken up, generated and united according to request of data frame
Frame is counted, and is issued to from node.
In the present embodiment, what is be waken up will calculate in the current super frame cycle from node according to current data transfer demands
The number of time slot needed for data is passed, the time data is packaged into request of data frame, and upload to by pre-assigned time slot
In network coordinator 10, multiple fair uploads from node in wireless body area network ensure that by request of data frame.
In one embodiment, request of data frame can be 6 bytes, including frame type, destination address, source address, time slot please
Ask number and check code.Wherein, frame type is 1 byte, and it is request of data frame that corresponding field, which will identify present frame,；Purpose
Address is 1 byte, is the address of network coordinator 10；Source address is 1 byte, be send request of data frame where the node
Address；Time slot request number is 1 byte, is to upload the number of time slot needed for data from node in the current super frame cycle；Check code
For 2 bytes, for ensureing the integrality of request of data frame.
Network coordinator 10 switchs to reception pattern by sending mode, and scheduler module 130 receives the data uploaded from node 30
Claim frame, and by number of time slot in request of data frame and the corresponding storage of corresponding node identification.
Further, reception to data claim frame carries out timing, whether judges to receive time that request of data frame expends
Reach default time limit value, if so, then will not receive time slot data corresponding to node identification corresponding to request of data frame
It is designated as zero, it is believed that it should need not carry out data transmission from node, still in resting state, if not up to default time limit value,
Then continue the reception of request of data frame.
The reception of control data claim frame in time of passage time limit value will ensure that in wireless body area network to exist from node
The transmission of data is completed in super frame period.
After request of data frame receives, scheduler module 130 will be carried out to the number of time slot corresponding to node identification
Statistics, to know all slot requirements of the whole network from node, and schedule information is generated according to statistical result, the scheduling of generation is believed
Breath be packaged into statistics frame form be handed down to it is each from node in wireless body area network.Schedule information in statistics frame is used to distribute
Working time and dormancy time from node, the actual data transfer demands of current network are immediately fed back, and realized real-time
Scheduling.
Statistics frame is 7+2N bytes, including frame type, destination address, source address, total number of time slot, identify from node 30 and
Its time slot, check code.Wherein, frame type is 1 byte, and it is request of data frame that corresponding field, which will identify present frame,；Purpose
Address is 1 byte, is from node address in wireless body area network；Source address is 1 byte, is the location of network coordinator 10
Location；Total number of time slot is 2 bytes, is that network coordinator 10 counts obtained wireless body area network according to the request of data frame of reception
All slot requirements；Node identification and its time slot are 2N bytes, and node identification and its time slot are that the node identification is corresponding from section
The schedule information of point, according to the time slot of record will upload the transmission of data from node.
Data processing module 150, for receiving the upload data from node, the upload data are according to the tune in statistics frame
Spend information transfer.
In the present embodiment, from node after the schedule information issued is received, by according to recorded in schedule information when
Gap upload the transmission of data.In the presence of schedule information, uploaded in order from the time slot of node distribution in wireless body area network
Data, it effectively prevent from node and be lined up upload data, and then shorten the exclusion time delay of data.
The data of upload are packaged into the form of data frame, are 128 bytes, including frame type, destination address, source address,
Frame number, frame data and check code.Wherein, frame type is 1 byte, and it is data frame that corresponding field, which will identify present frame,；
Destination address is 1 byte, is the address of network coordinator 10；Source address is 1 byte, is from node address；Frame data
122 bytes, it is the data uploaded required for node.
In another embodiment, also include in the network coordinator 10 of the data transmission system in above-mentioned wireless body area network
Timer, the timer is used for the transmission triggering timing by beacon frame, and judges whether the time that timing obtains reaches setting
Super frame period, if so, then notifying waking up nodes module 110.
In the present embodiment, triggering timing device carries out timing while beacon frame is sent, when being carried out using beacon frame as starting
Between count.
Timer judges the super frame period for whether having reached setting using beacon frame as the time that starting progress timing obtains, if
It is then to illustrate that the data transfer that wireless body area network is carried out completes a cycle, needs to wait next super frame period from node
Time slot distribution can carry out the transmission of data again, if it is not, then continuing timing.
In another embodiment, above-mentioned network coordinator 10 also includes emergent management module, and the emergent management module is used
In receiving emergency data claim frame, the transmission for uploading data is interrupted or waits request of data frame to issue finishing, reception is initiated urgent
The emergency data uploaded from node of claim frame.
It is inevasible that some urgent progress of data needs occur in the data transfer of wireless body area network in the present embodiment
The situation of upload, emergent management module, if carrying out the upload of data, interrupt number when receiving emergency data claim frame
According to upload, and carry out the upload of emergency data so that emergency data can be transmitted in time, if in wireless body area network just
Issued carrying out request of data frame, then need to wait request of data frame issue finish after upload emergency data again.
In one embodiment, after the upload of data is completed, for the data of upload, integrality inspection will be carried out
Look into.Judge whether the data of upload are complete, if it is not, then the loss of data occurs for explanation, by the inactive phase in super frame period
Start retransmission mechanism, and there occurs point-to-point re-transmission is carried out from node corresponding to loss of data, if so, then entirely without wire body
Domain net will enter resting state, to wait the arrival of next super frame period.
In another embodiment, above-mentioned also to include sleep block from node 30, the sleep block is used for upload to be done
Enter resting state after the transmission of data.
In the present embodiment, make to enter resting state from node 30 completing sleep block after data upload from node 30,
To reduce power consumption.
Using network coordinator as host node, wireless body area network is constituted from node with multiple, and beacon frame, request of data
Frame, statistics frame and data frame are also constituted for realizing the superframe of data transfer in wireless body area network, and pass through request of data
Frame has fed back each data transfer demands from node to master node network telegon exactly, meanwhile, statistics frame is super at one
Immediate feedback is carried out to data claim frame in frame, significantly shortens and wait of the transmission of data on superframe is uploaded from node
Time delay.
Data transmission system in above-mentioned wireless body area network realizes the cyclical transmission of data according to super frame period, above-mentioned
In super frame period set by wireless body area network, include five stages according to sequencing for network coordinator 10,
I.e. the transmission phase of beacon frame, the reception stage of request of data frame, statistics frame generation and issue stage, the reception rank of data frame
Section and inactive phase, wherein, the inactive phase is reserved for the re-transmission of data frame.
Data transmission system in above-mentioned wireless body area network by network coordinator 10 to carrying out data management from node, can
Applied to medical field, such as the application of physiological parameter acquisition and the monitoring state of an illness, and due to competitive agreement need not be used
The time slot transmission route of data is obtained, so as to ensure to obtain the authority for uploading data in time from node, to upload emergency medical
Data.
Further, since network coordinator 10 can obtain all data transfer demands in wireless body area network completely, therefore
Can scheduling mechanism the most rational cause from node with minimum cost complete data transfer, so as to realize low-energy-efficiency, in addition,
The generation of frame collision is avoided due to competitive agreement need not be used to obtain the time slot transmission route of data, is further reduced
Efficiency.
Data transmission method and system in above-mentioned wireless body area network, waking up after node by request of data frame and
The orderly control being implemented in combination with to being uploaded from node of the statistics frame issued, the data carried out according to schedule information upload full
Each upload demand from node in foot wireless body area network, the order that data upload is also ensure that, is realized to without wire body
Comprehensive control of data transfer in the net of domain, and then avoid and consumed when data upload requests repeating transmission caused by contention protocols
The energy taken, improves efficiency.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. the data transmission method in a kind of wireless body area network, comprises the following steps：
Wake up from node；
The request of data frame uploaded from node of the wake-up is received, statistics frame is generated according to the request of data frame, and issue
To from node；
The upload data from node are received, the upload data are according to the transmitting scheduling information in the statistics frame；
Also include：
After the upload data are completed to upload, judge whether the upload data are complete, if it is not, then data occur for explanation
Lose, inactive phase in super frame period starts retransmission mechanism, and there occurs carried out a little from node corresponding to loss of data
Re-transmission to point, if so, then whole wireless body area network will enter resting state, wait the arrival of next super frame period；It is described super
Frame period is the default period, is all data transfer cycles from node in wireless body area network；
Wherein, described in the reception from the upload data of node, statistics frame is generated according to the request of data frame, and be issued to from
Step in node includes：After request of data frame receives, the number of time slot corresponding to node identification is counted,
To know all slot requirements of the whole network from node, and schedule information is generated according to statistical result, the schedule information of generation is beaten
Each schedule information from node, the statistics frame that the form of statistics frame is handed down in wireless body area network is bundled into be used to distribute
The working time and dormancy time from node, the actual data transfer demands of current network are immediately fed back, and realize reality
When dispatch；
It is described to receive also including from the step of request of data frame of node upload for the wake-up：Receive the wake-up from node
The request of data frame of upload, the reception to the request of data frame carry out timing, judge to receive what the request of data frame expended
Whether the time reaches default time limit value, if so, will then not receive corresponding to node identification corresponding to request of data frame
Time slot data are designated as zero, it is believed that should need not carry out data transmission from node, still in resting state, if when not up to default
Between limit value, then continue the reception of the request of data frame；
Also include：
Emergency data claim frame is received, the transmission for uploading data is interrupted or waits the request of data frame to upload finishing, connect
The emergency data uploaded from node of emergency data claim frame is received and dispatched；
Wherein, the request of data frame is uploaded to network coordinator from node by the wake-up by pre-assigned time slot；
The data that upload are sent by the form of data frame；Beacon frame, request of data frame, statistics frame and data frame include verification
Code.
2. the data transmission method in wireless body area network according to claim 1, it is characterised in that described to wake up from node
The step of be：
Beacon frame is sent from node into wireless body area network, the beacon frame includes source address and time synchronization information.
3. the data transmission method in wireless body area network according to claim 2, it is characterised in that described to wake up from node
The step of after also include：
The beacon frame received is read, whether the source address for judging to record in the beacon frame is address where network coordinator,
If so, then
The extraction time synchronizing information from the beacon frame, and time synchronized is carried out according to the time synchronization information.
4. the data transmission method in wireless body area network according to claim 2, it is characterised in that also include：
Pass through the transmission triggering timing of the beacon frame；
Judge whether time that the timing obtains reaches the super frame period of setting, if so, then
Return it is described into wireless body area network from node send beacon frame the step of.
5. the data transmission method in wireless body area network according to claim 1, it is characterised in that also include：
Make completion upload data transfer enters resting state from node.
A kind of 6. data transmission system in wireless body area network, it is characterised in that including network coordinator, the network coordinator
Including：
Waking up nodes module, for waking up from node；
Scheduler module, for receiving the request of data frame uploaded from node of the wake-up, generated according to the request of data frame
Statistics frame, and be issued to from node；
Data processing module, for receiving the upload data from node, the upload data are according in the statistics frame
Transmitting scheduling information；
Data transmission system in the wireless body area network, it is additionally operable to after the upload data are completed to upload, described in judgement
Upload whether data are complete, if it is not, then the loss of data occurs for explanation, the inactive phase in super frame period starts re-transmission machine
System, and there occurs point-to-point re-transmission is carried out from node corresponding to loss of data, if so, then whole wireless body area network will enter
Resting state, wait the arrival of next super frame period；The super frame period is the default period, is owned in wireless body area network
From the data transfer cycle of node；
Wherein, the scheduler module, after being received in request of data frame, to the time slot corresponding to node identification
Number is counted, and to know all slot requirements of the whole network from node, and is generated schedule information according to statistical result, will be generated
Schedule information be packaged into the form of statistics frame and be handed down to each scheduling from node, the statistics frame in wireless body area network
Information is used to distribute the working time from node and dormancy time, and immediately feeding back the actual data transfer of current network needs
Ask, and realize Real-Time Scheduling；
The network coordinator, it is additionally operable to receive the request of data frame uploaded from node of the wake-up, to the request of data
The reception of frame carries out timing, judges to receive whether the time that the request of data frame expends reaches default time limit value, if so,
Time slot data corresponding to then receiving node identification corresponding to request of data frame are designated as zero, it is believed that should need not from node
Carry out data transmission, still in resting state, if not up to default time limit value, continues the request of data frame
Receive；
The network coordinator also includes：
Emergent management module, for receiving emergency data claim frame, interrupt the transmission for uploading data or wait the data
Claim frame is uploaded and finished, and receives the emergency data uploaded from node for initiating emergency data claim frame；
Wherein, the request of data frame is uploaded to network coordinator from node by the wake-up by pre-assigned time slot；
The data that upload are sent by the form of data frame；Beacon frame, request of data frame, statistics frame and data frame include verification
Code.
7. the data transmission system in wireless body area network according to claim 6, it is characterised in that the waking up nodes mould
Block is additionally operable to send beacon frame from node into wireless body area network, and the beacon frame includes source address and time synchronization information.
8. the data transmission system in wireless body area network according to claim 7, it is characterised in that also include from node,
It is described to include from node：
Read module, for reading the beacon frame received, whether the source address for judging to record in the beacon frame is the network coordination
Address where device, if so, then notifying time synchronized module；
The time synchronized module is used for the extraction time synchronizing information from the beacon frame, and according to the time synchronization information
Carry out time synchronized.
9. the data transmission system in wireless body area network according to claim 7, it is characterised in that the network coordinator
Also include：
Timer, for the transmission triggering timing by the beacon frame, and judge whether the time that timing obtains reaches setting
Super frame period, if so, then notifying the waking up nodes module.
10. the data transmission system in wireless body area network according to claim 6, it is characterised in that it is described from node also
Including：
Sleep block, enter resting state after the transmission for upload data to be done.
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| CN104243110B (en) * | 2014-08-25 | 2017-06-16 | 国网电力科学研究院 | A kind of radio sensing network data transmission method based on non real-time acknowledgement mechanism |
| CN104301973B (en) * | 2014-10-30 | 2018-02-09 | 西安电子科技大学 | A kind of method of wireless body area network fast wake-up association |
| CN105722228A (en) * | 2016-02-02 | 2016-06-29 | 同济大学 | Wireless body area network oriented controllable time delay multi-channel MAC protocol |
| US10292031B1 (en) * | 2018-01-30 | 2019-05-14 | Nxp B.V. | Wireless network device |
| CN111416682B (en) * | 2019-01-07 | 2021-10-26 | 华为技术有限公司 | Data transmission method and communication equipment |
| CN110167115A (en) * | 2019-05-20 | 2019-08-23 | 河南科技大学 | Wireless body area network MAC protocol, communication means and system based on wake-up mechanism |
| CN114301565B (en) * | 2021-12-30 | 2023-12-29 | 上海布鲁可积木科技有限公司 | Wireless communication method and system between toy modules |
| CN116319712B (en) * | 2023-05-23 | 2023-08-18 | 北京智芯半导体科技有限公司 | Wireless upgrading method and device for slave nodes of power equipment body area network |
| CN116981036B (en) * | 2023-09-19 | 2024-01-23 | 北京智芯微电子科技有限公司 | Data transmission method and device in body area network, storage medium and electronic equipment |
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