CN103874172A - 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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- CN103874172A CN103874172A CN201210546312.3A CN201210546312A CN103874172A CN 103874172 A CN103874172 A CN 103874172A CN 201210546312 A CN201210546312 A CN 201210546312A CN 103874172 A CN103874172 A CN 103874172A
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Abstract
The invention provides a data transmission method and a data transmission system in a wireless body area network. The data transmission method comprises the following steps: awakening a slave node; receiving a data request frame uploaded by the awoken slave node, generating a statistical frame according to the data request frame, and issuing the statistical frame into the slave node; receiving uploaded data of the slave node, wherein the uploaded data are transmitted according to scheduling information in the statistical frame. The data transmission system comprises a network coordinator, wherein the network coordinator comprises a node awakening module, a scheduling module and a data processing module; the node awakening module is used for awakening the slave node; the scheduling module is used for receiving the data request frame uploaded by the awoken slave node, generating the statistical frame according to the data request frame, and issuing the statistical frame into the slave node; the data processing module is used for receiving the uploaded data of the slave node; the uploaded data are transmitted according to the scheduling information in the statistical frame. According to the method and the system, the energy efficiency can be improved, and waiting time delay of the data in a super-frame can be shortened.
Description
Technical field
The present invention relates to human body communication technology, particularly relate to data transmission method and system in a kind of wireless body area network.
Background technology
Wireless body area network is the communication network that carries out transfer of data taking human body as communication channel.In traditional wireless body area network, mainly apply the agreement such as bluetooth, Zigbee and realize group-net communication.Be applied to the agreement such as bluetooth, Zigbee in wireless body area network and be all based on wide coverage, can carry out multistage bunch of these factor designs of tree network of multi-hop, and wireless body area network is mostly hub-and-spoke configuration, one jumps the transmission that can complete data, therefore, the wireless body area network of realizing by the agreement such as bluetooth or Zigbee is too complicated, for Star Network simple in structure, usually need to expend too much resource and process unnecessary details, and then caused the low defect of efficiency in wireless body area network.
Summary of the invention
Based on this, be necessary the defect problem low for efficiency in wireless body area network, the data transmission method in a kind of wireless body area network that can improve efficiency is provided.
In addition, be also necessary to provide the data transmission system in a kind of wireless body area network that can improve efficiency.
A data transmission method in wireless body area network, comprises the steps:
Wake up from node;
The request of data frame of uploading from node waking up described in reception, generates statistics frame according to described request of data frame, and is issued to from node;
Receive the described uploading data from node, described uploading data is according to the transmitting scheduling information in described statistics frame.
Therein in an embodiment, described in wake node up step be:
To sending beacon frame from node in wireless body area network, described beacon frame comprises source address and time synchronization information.
Therein in an embodiment, described in also comprise after waking the step of node up:
Read the beacon frame of reception, judge whether the source address recording in described beacon frame is the address at network coordinator place, if so,
From described beacon frame extraction time synchronizing information, and carry out time synchronized according to described time synchronization information.
In an embodiment, also comprise therein:
By the transmission triggering timing of described beacon frame;
Judge whether time that described timing obtains reach the super frame period of setting, if so,
Return to the described step from node transmission beacon frame in wireless body area network.
In an embodiment, also comprise therein:
Receive emergency data claim frame, interrupt the transmission of described uploading data or wait for that described request of data frame issues complete, receive the emergency data of uploading from node of initiating emergency data claim frame.
In an embodiment, also comprise therein:
What made uploading data transmission enters resting state from node.
A data transmission system in wireless body area network, comprises network coordinator, and described network coordinator comprises:
Node wake module, for waking up from node;
Scheduler module, for the request of data frame of uploading from node waking up described in receiving, generates statistics frame according to described request of data frame, and is issued to from node;
Data processing module, for receiving the described uploading data from node, described uploading data is according to the transmitting scheduling information in described statistics frame.
Therein in an embodiment, described node wake module also for to wireless body area network send beacon frame from node, described beacon frame comprises source address and time synchronization information.
In an embodiment, also comprise from node therein, describedly comprise from node:
Read module, for reading the beacon frame of reception, judges whether the source address recording in described beacon frame is the address at network coordinator place, if so, notifies time synchronized module;
Described time synchronized module is used for from described beacon frame extraction time synchronizing information, and carries out time synchronized according to described time synchronization information.
In an embodiment, described network coordinator also comprises therein:
Timer, for the transmission triggering timing by described beacon frame, and judges whether time that timing obtains reach the super frame period of setting, if so, notifies described node wake module.
In an embodiment, described network coordinator also comprises therein:
Emergency treatment module, for receiving emergency data claim frame, interrupts the transmission of described uploading data or waits for that described request of data frame issues complete, receives the emergency data of uploading from node of initiating flash request frame.
In an embodiment, described node also comprises therein:
Sleep block, for entering resting state after completing the transmission of uploading data.
Data transmission method in above-mentioned wireless body area network and system, waking up after node by request of data frame and the statistics frame that issues in conjunction with having realized the orderly control that node is uploaded, the data upload of carrying out according to the schedule information in statistics frame has met in wireless body area network each from the demand of uploading of node, also ensured the order of data upload, realize the comprehensive control to transfer of data in wireless body area network, and then avoided the energy expending in the situations such as the data upload request repeat causing because of contention protocols, improve efficiency.
Brief description of the drawings
Fig. 1 is the flow chart of the data transmission method in wireless body area network in an embodiment;
Fig. 2 is the structural representation of beacon frame in an embodiment;
Fig. 3 is the method flow diagram that wakes node in Fig. 1 up;
Fig. 4 is the structural representation of request of data frame in an embodiment;
Fig. 5 is the structural representation of statistics frame in an embodiment;
Fig. 6 is the structural representation of Frame in an embodiment;
Fig. 7 is the flow chart of the data transmission method in wireless body area network in another embodiment;
Fig. 8 divides schematic diagram in the stage of super frame period in an embodiment;
Fig. 9 is the structural representation of the data transmission system in wireless body area network in an 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, comprises the steps:
Step S110, wakes up from node.
In the present embodiment, in wireless body area network will be in resting state in the time not carrying out the transmission of uploading data from node, to reduce the efficiency from node by this low-power consumption mode.In the time carrying out the transmission of uploading data in wireless body area network, need to wake up in resting state from node, and then the data from node are transferred out.
In one embodiment, the detailed process of above-mentioned steps S110 is: to sending beacon frame from node in wireless body area network, this beacon frame comprises source address and time synchronization information.
In the present embodiment, in the wireless body area network taking human body as communication channel, medium access control (mediumaccess control, being called for short MAC) agreement determined the occupation mode of human body communication channel, from distributing limited human body communication channel resource between node, build the underlying basis structure of wireless body area network, therefore for wireless body area network, the applied data transmission mechanism of MAC layer at media access control protocol place will produce very large impact to the performance of wireless body area network, is one of key ensureing wireless body area network efficient communication.
To in resting state carry out from node wake up and can the transmission by beacon frame realize.Beacon frame is used for waking up from node, and set up the time synchronized in wireless body area network, wherein, whether the source address in beacon frame sends beacon frame device for identifying is network coordinator, and time synchronization information is the foundation of carrying out time synchronized in wireless body area network.
In one embodiment, as shown in Figure 2, beacon frame can be 7 bytes to the structure of beacon frame, has comprised frame type, destination address, source address, time synchronization information and check code.Wherein, frame type is 1 byte, and corresponding field is beacon frame by having identified present frame; Destination address be received beacon frame from node address, corresponding 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 to sending beacon frame from node in wireless body area network.Concrete, periodically waking network coordinator up, the transmitter module in opening network telegon sends beacon frame, and is realized the whole network is carried out to time synchronized from node by beacon frame.
Implement for ensureing transfer of data effective in wireless body area network, will carry out management and control by super frame period in time.Super frame period is the default time period, is all data transfer cycles from node in wireless body area network.Network coordinator completes by controlling the process that wakes up to transmission data in super frame period from node, and in current super frame period, meets each transfer of data demand from node.Beacon frame by network coordinator in starting stage of super frame period to sending from node.
As shown in Figure 3, in one embodiment, after above-mentioned steps S110, also comprise:
Step S210, reads the beacon frame of reception, judges whether the source address recording in beacon frame is the address at network coordinator place, if so, enters step S230, if not, enters step S250.
In the present embodiment, in wireless body area network from node after received beacon frame, the source address and the time synchronization information that obtain in beacon frame will be read, and then whether the equipment that judges transmission beacon frame is network coordinator, if so, in being waken up from node of resting state, and carry out time synchronized according to read the time synchronization information obtaining from beacon frame, if determining the source of beacon frame is not network coordinator, keep resting state.
Step S230, from beacon frame extraction time synchronizing information, and carry out time synchronized according to time synchronization information.
In the present embodiment, the time synchronization information that each in wireless body area network all sends according to network coordinator from node is carried out time synchronized, is synchronous to make the time from node in wireless body area network.
Step S250, stays in resting state.
Step S130, receives the request of data frame of uploading from node waking up, generates statistics frame, and be issued to from node according to request of data frame.
In the present embodiment, what be waken up will calculate the required number of time slot of uploading data in current super frame period from node according to current transfer of data demand, this time data is packaged into request of data frame, and upload in network coordinator by pre-assigned time slot, ensure that by request of data frame in wireless body area network, multiple justices from node are uploaded.
In one embodiment, as shown in Figure 4, request of data frame can be 6 bytes, comprises frame type, destination address, source address, time slot request number and check code.Wherein, frame type is 1 byte, and corresponding field is request of data frame by having identified present 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 at the required number of time slot of current super frame period uploading data from node; Check code is 2 bytes, for ensureing the integrality of request of data frame.
Network coordinator transfers receiving mode to by sending mode, receives the request of data frame uploaded from node, and by the number of time slot in request of data frame and corresponding node identification corresponding stored.
Further, the reception of data claim frame is carried out to timing, judge whether the time that reception request of data frame expends reaches default time limit value, if, be designated as zero by not receiving the time slot data that the corresponding node identification of request of data frame is corresponding, think that this does not need to carry out transfer of data from node, still in resting state, if do not reach default time limit value, proceed the reception of request of data frame.
The reception of controlling in time request of data frame by time limit value will ensure to complete in super frame period from node in wireless body area network the transmission of data.
After request of data frame receives, to add up the corresponding number of time slot of node identification, to know all time slot demands of the whole network from node, and generating schedule information according to statistics, the form that the schedule information of generation is packaged into statistics frame is handed down to each in wireless body area network from node.Schedule information in statistics frame, for distributing operating time and the dormancy time from node, has immediately been fed back the transfer of data demand of current network reality, and has been realized Real-Time Scheduling.
As shown in Figure 5, statistics frame is 7+2N byte, comprises frame type, destination address, source address, total number of time slot, node identification and time slot thereof, check code.Wherein, frame type is 1 byte, and corresponding field is request of data frame by having identified present frame; Destination address is 1 byte, is from node address in wireless body area network; Source address is 1 byte, is network coordinator address; Total number of time slot is 2 bytes, is all time slot demands that network coordinator adds up according to the request of data frame receiving the wireless body area network obtaining; Node identification and time slot thereof are 2N byte, and node identification and time slot thereof are the schedule information of this node identification correspondence from node, will carry out the transmission of uploading data according to the time slot of record from node.
Step S150, receives from the uploading data of node, and this uploading data is according to the transmitting scheduling information in statistics frame.
In the present embodiment, after receiving the schedule information issuing, the time slot according to recording in schedule information is carried out to uploading of data from node.Under the effect of schedule information, the orderly uploading data of time slot that the node in wireless body area network distributes, has effectively avoided node to get rid of uploading data, and then has shortened the queuing delay of data.
As shown in Figure 6, the data of uploading are packaged into the form of Frame, are 128 bytes, comprise frame type, destination address, source address, frame number, frame data and check code.Wherein, frame type is 1 byte, and corresponding field is Frame by having identified present frame; Destination address is 1 byte, is network coordinator address; Source address is 1 byte, is node address; Frame data 122 bytes are the required data uploaded of node.
As shown in Figure 7, in another embodiment, the data transmission method in above-mentioned wireless body area network also comprises:
Step S310, by the transmission triggering timing of beacon frame.
In the present embodiment, in sending beacon frame, trigger and carry out timing, taking beacon frame as the initial time statistics of carrying out.
Step S330, judges whether time that timing obtains reach the super frame period of setting, if so, returns to step S110, if not, returns to step S310.
In the present embodiment, judge taking beacon frame and carry out the time that timing obtains and whether reached the super frame period of setting as initial, if, illustrate that the transfer of data that wireless body area network carries out has completed one-period, node need to wait for that the time slot allocation of next super frame period can carry out the transmission of data again, if not, proceed timing.
In another embodiment, the data transmission method of above-mentioned wireless body area network also comprises: receive emergency data claim frame, the transmission of interruption uploading data or wait request of data frame issue complete, receive the emergency data of uploading from node of initiating emergency data claim frame.
In the present embodiment, in the transfer of data of wireless body area network, the situation that some data of inevasible generation need to promptly be uploaded, in the time receiving emergency data claim frame, if carrying out uploading of data, interrupt uploading of data, and carry out uploading of emergency data, emergency data can be transmitted in time, if carrying out issuing of request of data frame in wireless body area network, need to wait for that request of data frame issues the complete emergency data of uploading again afterwards.
In one embodiment, after having completed the uploading of data, for the data of uploading, will carry out integrity checking.Whether the data that judgement is uploaded are complete, if not, there is the loss of data in explanation, non-active period in super frame period is started to retransmission mechanism, loss of data is corresponding carries out point-to-point re-transmission from node with having occurred, if not, whole wireless body area network will enter resting state, to wait for the arrival of next super frame period.
In another embodiment, the data transmission method of above-mentioned wireless body area network also comprises: what made uploading data transmission enters the step of resting state from node.
In the present embodiment, after completing data upload, node will enter resting state, to reduce power consumption.
Taking network coordinator as host node, form wireless body area network with multiple from node, and beacon frame, request of data frame, statistics frame and Frame have also formed the superframe for realizing wireless body area network transfer of data, and feed back each transfer of data demand from node to master node network telegon exactly by request of data frame, simultaneously, statistics frame is carried out immediate feedback to data claim frame in a superframe, the wait time delay of the transmission of having shortened widely uploading data from node on superframe.
Data transmission method in above-mentioned wireless body area network is realized the cyclical transmission of data according to super frame period, as shown in Figure 8, in the super frame period setting at above-mentioned wireless body area network, for network coordinator, comprise double teacher according to sequencing, be transmission phase, the request of data frame of beacon frame reception stage, statistics frame generation and issue reception stage and the non-active period of stage, Frame, wherein, non-active period is to reserve for the re-transmission of Frame.
Data transmission method in above-mentioned wireless body area network carries out data management by network coordinator to node, can be applicable to medical field, the application of for example physiological parameter collection and the monitoring state of an illness, and owing to not needing to adopt competitive agreement to obtain the time slot transmission route of data, thereby can ensure that node obtains the authority of uploading data in time, to upload emergency medical data.
In addition, because network coordinator can obtain all transfer of data demands in wireless body area network completely, therefore the most reasonably scheduling mechanism makes node complete transfer of data with minimum cost, thereby realize low-energy-efficiency, in addition, owing to not needing the time slot transmission route that adopts competitive agreement to obtain data to avoid the generation of frame collision, reduce further efficiency.
As shown in Figure 9, in one embodiment, the data transmission system in a kind of wireless body area network, network coordinator 10, this network coordinator 10 comprises node wake module 110, scheduler module 130 and data processing module 150.
In the present embodiment, in wireless body area network will be in resting state, to reduce the efficiency from node by this low-power consumption mode when the uploading data not from node.In the time of the transfer of data of carrying out in wireless body area network, need node wake module 110 wake up in resting state from node, and then the data from node are transferred out.
In one embodiment, above-mentioned node wake module 110 also for to wireless body area network from node send beacon frame, this beacon frame comprises source address and time synchronization information.
In the present embodiment, in the wireless body area network taking human body as communication channel, media access control protocol has determined the occupation mode of human body communication channel, from distributing limited human body communication channel resource between node, build the underlying basis structure of wireless body area network, therefore for wireless body area network, the applied data transmission mechanism of MAC layer at media access control protocol place will produce very large impact to the performance of wireless body area network, is one of key ensureing wireless body area network efficient communication.
To in resting state carry out from node wake up and can the transmission by beacon frame realize.Beacon frame is used for waking up from node, and set up the time synchronized in wireless body area network, wherein, whether the source address in beacon frame sends beacon frame device for identifying is network coordinator 10, and time synchronization information is the foundation of carrying out time synchronized in wireless body area network.
Beacon frame can be 7 bytes, has comprised frame type, destination address, source address, time synchronization information and check code.Wherein, frame type is 1 byte, and corresponding field is beacon frame by having identified present frame; Destination address be received beacon frame from node address, corresponding 1 byte; Check code is 2 bytes, for ensureing the integrality of frame.
In another embodiment, beacon frame is sent by node wake module 110 timing, periodically to sending beacon frame from node in wireless body area network.Concrete, periodically wake node wake module 110 up, send beacon frame, and realize the whole network is carried out to time synchronized from node by beacon frame.
Implement for ensureing transfer of data effective in wireless body area network, will carry out management and control by super frame period in time.Super frame period is the default time period, is all data transfer cycles from node in wireless body area network.Network coordinator 10 completes by controlling the process that wakes up to transmission data in super frame period from node, and in current super frame period, meets each transfer of data demand from node.Beacon frame by from node wake module 110 in starting stage of super frame period to sending from node.
As shown in figure 10, in one embodiment, the data transmission system in above-mentioned wireless body area network also comprises with network coordinator 10 carries out the some from node 30 of data interaction, should comprise read module 310 and time synchronized module 330 from node 30.
Read module 310, for reading the beacon frame of reception, judge whether the source address recording in beacon frame is the address at network coordinator 10 places, if so, notifies time synchronized module 330, if not, stays in resting state.
In the present embodiment, in wireless body area network from node 30 after received beacon frame, read module 310 will read the source address and the time synchronization information that obtain in beacon frame, and then whether the equipment that judges transmission beacon frame is network coordinator 10, if, being waken up from node 30 in resting state, time synchronized module 330 is carried out time synchronized according to read the time synchronization information obtaining from beacon frame, be not network coordinator 10 if determine the source of beacon frame, keep resting state.
Time synchronized module 330, for from beacon frame extraction time synchronizing information, and carries out time synchronized according to time synchronization information.
In the present embodiment, each in wireless body area network is from node 30, and the time synchronization information that time synchronized module 330 all sends according to network coordinator 10 is carried out time synchronized, with make in wireless body area network from the time of node 30 be synchronous.
In the present embodiment, what be waken up will calculate the required number of time slot of uploading data in current super frame period from node according to current transfer of data demand, this time data is packaged into request of data frame, and upload in network coordinator 10 by pre-assigned time slot, ensure that by request of data frame in wireless body area network, multiple justices from node are uploaded.
In one embodiment, request of data frame can be 6 bytes, comprises frame type, destination address, source address, time slot request number and check code.Wherein, frame type is 1 byte, and corresponding field is request of data frame by having identified present frame; Destination address is 1 byte, is network coordinator 10 addresses; Source address is 1 byte, be send request of data frame from node address; Time slot request number is 1 byte, is at the required number of time slot of current super frame period uploading data from node; Check code is 2 bytes, for ensureing the integrality of request of data frame.
Further, the reception of data claim frame is carried out to timing, judge whether the time that reception request of data frame expends reaches default time limit value, if, be designated as zero by not receiving the time slot data that the corresponding node identification of request of data frame is corresponding, think that this does not need to carry out transfer of data from node, still in resting state, if do not reach default time limit value, proceed the reception of request of data frame.
The reception of controlling in time request of data frame by time limit value will ensure to complete in super frame period from node in wireless body area network the transmission of data.
After request of data frame receives, scheduler module 130 will be added up the corresponding number of time slot of node identification, to know all time slot demands of the whole network from node, and generating schedule information according to statistics, the form that the schedule information of generation is packaged into statistics frame is handed down to each in wireless body area network from node.Schedule information in statistics frame, for distributing operating time and the dormancy time from node, has immediately been fed back the transfer of data demand of current network reality, and has been realized Real-Time Scheduling.
Statistics frame is 7+2N byte, comprises frame type, destination address, source address, total number of time slot, from node 30 marks and time slot thereof, check code.Wherein, frame type is 1 byte, and corresponding field is request of data frame by having identified present frame; Destination address is 1 byte, is from node address in wireless body area network; Source address is 1 byte, is network coordinator 10 addresses; Total number of time slot is 2 bytes, is all time slot demands that network coordinator 10 adds up according to the request of data frame receiving the wireless body area network obtaining; Node identification and time slot thereof are 2N byte, and node identification and time slot thereof are the schedule information of this node identification correspondence from node, will carry out the transmission of uploading data according to the time slot of record from node.
In the present embodiment, after receiving the schedule information issuing, the time slot according to recording in schedule information is carried out to the transmission of uploading data from node.Under the effect of schedule information, the orderly uploading data of time slot distributing from node in wireless body area network, has effectively avoided from node queuing uploading data, and then has shortened the eliminating time delay of data.
The data of uploading are packaged into the form of Frame, are 128 bytes, comprise frame type, destination address, source address, frame number, frame data and check code.Wherein, frame type is 1 byte, and corresponding field is Frame by having identified present frame; Destination address is 1 byte, is network coordinator 10 addresses; Source address is 1 byte, is from node address; Frame data 122 bytes are from the required data of uploading of node.
In another embodiment, in the network coordinator 10 of the data transmission system in above-mentioned wireless body area network, also comprise timer, this timer is for passing through the transmission triggering timing of beacon frame, and judge whether time that timing obtains reaches the super frame period of setting, if so, notify node wake module 110.
In the present embodiment, in sending beacon frame, triggering timing device carries out timing, taking beacon frame as the initial time statistics of carrying out.
Timer judges taking beacon frame and carries out the time that timing obtains and whether reached the super frame period of setting as initial, if, illustrate that the transfer of data that wireless body area network carries out has completed one-period, need to wait for that from node the time slot allocation of next super frame period can carry out the transmission of data again, if not, proceed timing.
In another embodiment, above-mentioned network coordinator 10 also comprises emergency treatment module, this emergency treatment module is used for receiving emergency data claim frame, and the transmission of interruption uploading data or wait request of data frame issue complete, receive the emergency data of uploading from node of initiating flash request frame.
In the present embodiment, in the transfer of data of wireless body area network, the situation that some data of inevasible generation need to promptly be uploaded, emergency treatment module, in the time receiving emergency data claim frame, if carrying out uploading of data, is interrupted uploading of data, and carry out uploading of emergency data, emergency data can be transmitted in time, if carrying out issuing of request of data frame in wireless body area network, need to wait for that request of data frame issues the complete emergency data of uploading again afterwards.
In one embodiment, after having completed the uploading of data, for the data of uploading, will carry out integrity checking.Whether the data that judgement is uploaded are complete, if not, there is the loss of data in explanation, non-active period in super frame period is started to retransmission mechanism, loss of data is corresponding carries out point-to-point re-transmission from node with having occurred, if not, whole wireless body area network will enter resting state, to wait for the arrival of next super frame period.
In another embodiment, above-mentionedly also comprise sleep block from node 30, this sleep block for entering resting state after completing the transmission of uploading data.
In the present embodiment, complete data upload from node 30 after, sleep block makes to enter resting state from node 30, to reduce power consumption.
Taking network coordinator as host node, form wireless body area network with multiple from node, and beacon frame, request of data frame, statistics frame and Frame have also formed the superframe for realizing wireless body area network transfer of data, and feed back each transfer of data demand from node to master node network telegon exactly by request of data frame, simultaneously, statistics frame is carried out immediate feedback to data claim frame in a superframe, the wait time delay of the transmission of having shortened widely uploading data from node on superframe.
Data transmission system in above-mentioned wireless body area network realizes the cyclical transmission of data according to super frame period, in the super frame period setting at above-mentioned wireless body area network, for network coordinator 10, comprise double teacher according to sequencing, be transmission phase, the request of data frame of beacon frame reception stage, statistics frame generation and issue reception stage and the non-active period of stage, Frame, wherein, non-active period is to reserve for the re-transmission of Frame.
Data transmission system in above-mentioned wireless body area network by network coordinator 10 to carrying out data management from node, can be applicable to medical field, the application of for example physiological parameter collection and the monitoring state of an illness, and owing to not needing to adopt competitive agreement to obtain the time slot transmission route of data, thereby can ensure to obtain in time from node the authority of uploading data, to upload emergency medical data.
In addition, because network coordinator 10 can obtain all transfer of data demands in wireless body area network completely, therefore the most reasonably scheduling mechanism makes to complete transfer of data from node with minimum cost, thereby realize low-energy-efficiency, in addition, owing to not needing the time slot transmission route that adopts competitive agreement to obtain data to avoid the generation of frame collision, reduce further efficiency.
Data transmission method in above-mentioned wireless body area network and system, realize the orderly control to uploading from node in the combination waking up after node by request of data frame and the statistics frame that issues, the data upload of carrying out according to schedule information has met in wireless body area network each from the demand of uploading of node, also ensured the order of data upload, realize the comprehensive control to transfer of data in wireless body area network, and then avoided the energy expending in the situations such as the data upload request repeat causing because of contention protocols, improve efficiency.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (12)
1. the data transmission method in wireless body area network, comprises the steps:
Wake up from node;
The request of data frame of uploading from node waking up described in reception, generates statistics frame according to described request of data frame, and is issued to from node;
Receive the described uploading data from node, described uploading data is according to the transmitting scheduling information in described statistics frame.
2. the data transmission method in wireless body area network according to claim 1, is characterized in that, described in wake up from the step of node and be:
To sending beacon frame from node in wireless body area network, described beacon frame comprises source address and time synchronization information.
3. the data transmission method in wireless body area network according to claim 2, is characterized in that, described in wake up after the step of node and also comprise:
Read the beacon frame of reception, judge whether the source address recording in described beacon frame is the address at network coordinator place, if so,
From described beacon frame extraction time synchronizing information, and carry out time synchronized according to described time synchronization information.
4. the data transmission method in wireless body area network according to claim 2, is characterized in that, also comprises:
By the transmission triggering timing of described beacon frame;
Judge whether time that described timing obtains reach the super frame period of setting, if so,
Return to the described step from node transmission beacon frame in wireless body area network.
5. the data transmission method in wireless body area network according to claim 1, is characterized in that, also comprises:
Receive emergency data claim frame, interrupt the transmission of described uploading data or wait for that described request of data frame issues complete, receive the emergency data of uploading from node of initiating emergency data claim frame.
6. the data transmission method in wireless body area network according to claim 1, is characterized in that, also comprises:
What made uploading data transmission enters resting state from node.
7. the data transmission system in wireless body area network, is characterized in that, comprises network coordinator, and described network coordinator comprises:
Node wake module, for waking up from node;
Scheduler module, for the request of data frame of uploading from node waking up described in receiving, generates statistics frame according to described request of data frame, and is issued to from node;
Data processing module, for receiving the uploading data of described node, described uploading data is according to the transmitting scheduling information in described statistics frame.
8. the data transmission system in wireless body area network according to claim 7, is characterized in that, described node wake module also for to wireless body area network from node send beacon frame, described beacon frame comprises source address and time synchronization information.
9. the data transmission system in wireless body area network according to claim 8, is characterized in that, also comprises from node, describedly comprises from node:
Read module, for reading the beacon frame of reception, judges whether the source address recording in described beacon frame is the address at network coordinator place, if so, notifies time synchronized module;
Described time synchronized module is used for from described beacon frame extraction time synchronizing information, and carries out time synchronized according to described time synchronization information.
10. the data transmission system in wireless body area network according to claim 8, is characterized in that, described network coordinator also comprises:
Timer, for the transmission triggering timing by described beacon frame, and judges whether time that timing obtains reach the super frame period of setting, if so, notifies described node wake module.
Data transmission method in 11. wireless body area networks according to claim 7, is characterized in that, described network coordinator also comprises:
Emergency treatment module, for receiving emergency data claim frame, interrupts the transmission of described uploading data or waits for that described request of data frame issues complete, receives the emergency data of uploading from node of initiating flash request frame.
Data transmission system in 12. wireless body area networks according to claim 7, is characterized in that, described node also comprises:
Sleep block, for entering resting state after completing the transmission of uploading data.
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