CN109067480A - Using the energy and data transmission period distribution method of the WBAN of WPT technology - Google Patents
Using the energy and data transmission period distribution method of the WBAN of WPT technology Download PDFInfo
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- CN109067480A CN109067480A CN201810965206.6A CN201810965206A CN109067480A CN 109067480 A CN109067480 A CN 109067480A CN 201810965206 A CN201810965206 A CN 201810965206A CN 109067480 A CN109067480 A CN 109067480A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses the energy of WBAN using WPT technology a kind of and data transmission period distribution methods, comprising: any m-th of wireless sensor node obtains channel fading coefficient by CPICH Common Pilot Channel, and is sent to handheld terminal；After handheld terminal receives the channel fading coefficient of M wireless sensor node, base station is sent it to；After base station obtains the channel fading coefficient of whole M wireless sensor nodes, distributes to all N number of WPT emission sources and be used for time of concurrent transmission energy and beThe time for distributing to any m-th of wireless sensor node transmission data isIt base station willWithN number of WPT emission source and handheld terminal are given by SDCCH channel feedback；Handheld terminal willWithM wireless sensor node is transmitted to by SDCCH channel.Efficient energy can be carried out to the sensor node with different radio transmission condition and message transmission rate is distributed.
Description
Technical field
Energy and data transmission period are carried out for using the wireless body area network of wireless charging technology the present invention relates to a kind of
Distribution method, and in particular to it is a kind of using wireless charging technology wireless body area network in, control multiple wireless energy transfers
Emission source carries out the time of wireless energy transfer to multiple wireless sensor nodes for human body monitoring, and controls wireless sensing
The method that device node carries out data transmission the time using the energy after charging, belongs to wireless communication technology field.
Background technique
Wireless body area network (WBAN) is made of a large amount of wireless sensor nodes, these low-power consumption sensor nodes can continue
These data are simultaneously transferred to remote server by the important physiologic information of monitoring human body, such as document [1].The application field of WBAN includes
Medical treatment and nursing, consumer electronics and personal monitoring etc..In traditional WBAN, such as document [2], sensor node is battery powered,
Once battery exhausts, WBAN monitoring service is forced to stop.So high energy efficiency and long life are the important support skills of WBAN
Art.Most emerging wireless charging technology, which is limited for breakthrough wireless sensor node by battery capacity, provides a kind of effective solution
Certainly scheme, such as document [3].Using wireless energy transfer (WPT) technology, sensor node can emit penetrating for source radiation from WPT
Energy is captured in frequency signal.Document [4] theoretically demonstrates WBAN wireless sensor node and captures energy by WPT technology
Feasibility simultaneously gives basic design framework.
Document [4] is pointed out: how fair and energy transmission time sum number is efficiently distributed between multiple sensor nodes
It is the important scientific issues urgently to be resolved using the WBAN of WPT technology according to transmission time.It is caught to improve the wireless energy of WBAN
Obtain efficiency, document [5] proposes through distribution energy transmission time and data transmission period, and it is total to maximize all the sensors node
Message transmission rate.However, total data rate maximization approach easily causes the injustice of each sensor node data transmission rate
Levelling, it may be assumed that the sensor node having keeps high data rate transfer for a long time, and the message transmission rate of other sensor nodes
Close to 0.In order to solve the problems, such as this unfairness, document [5] advanced optimizes energy transmission time and data biography in WBAN
The defeated time makes all the sensors node obtain identical message transmission rate.In addition, document [6] also proposed in a kind of solution
Energy transmission time and the data transmission period distribution method of unjustness problem are stated, this method can make all sensings in WBAN
Device node obtains identical energy from WPT emission source.
Document [5] and document [6] although proposed in the energy transmission time and data transmission period distribution method guarantee
The fairness of message transmission rate or energy capture rate between each sensor node, but be reduction of and have preferable nothing
The message transmission rate of line channel condition node.
Document 1:S.Ullah, H.Higgins, B.Braem, et al., " A comprehensive survey of
wireless body area networks,”Journey of Medical Systems,vol.36,no.3,pp.1065-
1094,Jun.2012.
Document 2:D.B.Smith, D.Miniutti, T.A.Lamahewa, and L.W.Hanlen, " Propagation
models for body-area networks:A survey and new outlook,”IEEE Antennas and
Propagation Magazine,vol.55,no.5,pp.97-117,Oct.2913.
Document 3:P.Kamalinejad, C.Mahapatra, Z.Sheng, et al., " Wireless energy
harvesting for the Internet of Things,”IEEE Communications Magazine,vol.53,
no.6,pp.102-108,Jun.2015.
Document 4:H.M.Saraiva, L.M.Borges, P.Pinho, et al., " Experimental
characterization of wearable antennas and circuits for RF energy harvesting
in WBANs,”in Proc.IEEE 79th Vehicular Technology Conference,Seoul,South
Korea,May.2014,pp.1-5.
Document 5:H.Ju and R.Zhang, " Throughput maximization in wireless powered
communication networks,”IEEE Transactions on Wireless Communications,vol.13,
no.1,pp.418-428,Jan.2014.
Document 6:J.C.Kwan and A.O.Fapojuwo, " Radio frequency energy harvesting
and data rate optimization in wireless information and power transfer sensor
networks,”IEEE Sensors Journal,vol.17,no.15,pp.4862-4874,Aug.2017.
Summary of the invention
For the WBAN using WPT technology, wireless energy transfer time and the data transmission period in coordination network are needed,
Network resource utilization is improved, meets the communication requirement of the wireless sensor node for human body monitoring, in order to solve above-mentioned deposit
The technical issues of, the object of the present invention is to provide the energy of WBAN using WPT technology a kind of and data transmission periods point
Method of completing the square, this method can carry out efficient energy and number to the sensor node with different radio transmission condition
According to transmission rate allocation, overall performance gap very little compared with maximizing system data transmission Speed method, but can protect
It demonstrate,proves each sensor node and obtains required minimum data transmission rate.
The technical scheme is that
A kind of energy and data transmission period distribution method of the WBAN using WPT technology, comprising the following steps:
S01: any m-th of wireless sensor node obtains channel fading coefficient by CPICH Common Pilot Channel (CPICH), and
Handheld terminal is sent it to by SDCCH channel；Handheld terminal receives the channel fading coefficient of M wireless sensor node
Afterwards, base station is sent it to by SDCCH channel；
S02: after base station obtains the channel fading coefficient of whole M wireless sensor nodes, all N number of WPT transmittings are distributed to
Source is for time of concurrent transmission energy It is the solution of following equation:
Wherein,ζmIt is the energy receipts of any m-th of sensor node
Collect efficiency, any m-th of sensor node, which receives energy using part, to carry out data transmission, which is θm, hn,mIndicate n-th
The fading coefficients of channel, h between a WPT emission source and m-th of sensor nodem,HIndicate any m-th of sensor node and hand
Hold the fading coefficients of channel between terminal, tmThe data transmission period of any m-th of sensor node is distributed in expression, and T is indicated
The duration of any energy and data transfer cycle, σ in system2Indicate the noise power of system wireless channel, PnIndicate any n-th
The transmission power of a WPT emission source；
S03: the time of any m-th of wireless sensor node transmission data is distributed to are as follows:
S04: base station willWithN number of WPT emission source and handheld terminal are given by SDCCH channel feedback；Handheld terminal willWithM wireless sensor node is transmitted to by SDCCH channel.
In preferred technical solution, the allocation result of energy transmission time and data transmission period are obtained by following steps
It arrives:
S11: it is modeled as mathematical optimization problem:
S12: constraint condition is obtained:
Wherein, RmFor the utilization rate of Internet resources, w indicates the occupied spectral bandwidth of system, PmFor m-th of sensor section
The average transmission power of point；
S13: by solving above-mentioned optimization problem, the optimal energy transmission time and data transmission period distribution knot is obtained
Fruit.
In preferred technical solution, before the step S01 further include:
Before any one wireless energy and data transfer cycle start, M wireless sensor node passes through independent control
Channel (SDCCH) sends data transfer request to handheld terminal；
After handheld terminal receives the data transfer request of M wireless sensor node, the request is sent out by SDCCH channel
Give base station；
After the request is permitted in base station, open new a wireless energy and data transfer cycle, and set the duration as
T。
Compared with prior art, the invention has the advantages that
The method of the present invention can carry out efficient energy to the wireless sensor node in WBAN with different channels condition
And message transmission rate distribution, make the overall performance of system gap very little compared with maximizing system data rates method, but
It is that can guarantee that each sensor node obtains required minimum data transmission rate.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the wireless body area network system composition schematic diagram that the present invention uses wireless charging technology；
Fig. 2 is wireless energy transfer time and wireless data transmission time allocation plan schematic diagram of the present invention；
Fig. 3 is that the method for the present invention obtains schematic diagram of the overall data transmission rate compared with other methods；
Fig. 4 is that each sensor node of the method for the present invention obtains schematic diagram of the message transmission rate compared with other methods；
Fig. 5 is that the method for the present invention obtains schematic diagram of the whole fair sex index compared with other methods.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
The present invention is answered using the distribution method of energy and data transmission period in the wireless body area network of wireless charging technology
Be with scene: wireless body area network (WBAN) is made of a large amount of wireless sensor nodes, these low-power consumption sensor nodes can be held
The continuous monitoring important physiologic information of human body.Most emerging wireless charging technology is to break through wireless sensor node to be limited by battery capacity
System provides a kind of effective solution scheme: in WBAN working environment, the wireless energy transfer (WPT) of deployment-specific emits
Source, then the wireless sensor node of WBAN can capture energy from the radiofrequency signal that WPT emits source radiation, realize permanent supply
Electricity, not suspension thoroughly solve the problems, such as effective work phase of WBAN.System include M by be monitored it is that people carries, mended by WPT
To the wireless sensor node of energy, 1 base station, N number of WPT emission source, 1 by monitored people's carrying by battery powered
Handheld terminal.Above-mentioned base station, WPT emission source, handheld terminal and sensor node constitute the armamentarium of system, as shown in Figure 1.
In the scheme, whole M wireless sensor nodes are used to perceive the vital sign information of monitored people, such as heart
Jump, blood pressure, body temperature etc.；Whole N number of WPT emission sources are simultaneously sent to all M sensor nodes transmission energy；Handheld terminal is as M
Relay station between a sensor node and base station works in time domain semiduplex mode, it may be assumed that first open receiving antenna,
Transmitting antenna is closed, the sign information data that M sensor node is perceived are received；Receiving antenna is being closed, transmitting day is opened
Line, by received data forwarding to base station；Handheld terminal is when receiving the data of M sensor node, using time division multiple acess
(TDMA) use of the M sensor node to sharing wireless channel is controlled.
The occupied spectral bandwidth of system is indicated with w (unit Hz), uses σ2It indicates the noise power of system wireless channel, uses
T (the duration of any energy and data transfer cycle in unit s) expression system, comprising: wireless energy transfer time t0(0<t0<T)
With the wireless data transmission timeTwo parts, wherein tm(0≤tm< T) it indicates to distribute to any m (1≤m
≤ M) a sensor node data transmission period.Use PnIndicate the transmission power of any n-th (1≤n≤N) a WPT emission source,
Use hn,mIndicate the fading coefficients of channel between a WPT emission source of n-th (1≤n≤N) and m (1≤m≤M) a sensor node,
Use hm,HIndicate the fading coefficients of channel between a sensor node of any m (1≤m≤M) and handheld terminal.Any wireless
In energy and data transfer cycle T, all channel fading coefficients are remained unchanged, and any a sensor node of m (1≤m≤M) needs
The data that Lk bit is transmitted to base station, as relay node, on the one hand handheld terminal needs to receive M sensor node and sends
Data, on the other hand need to forward these data to base station.To WPT emission source N number of in system and M wireless sensor node
The transmission time allocation flow of point is as follows:
1, before any one wireless energy and data transfer cycle start, M wireless sensor node passes through independent control
Channel (SDCCH, Stand-Alone Dedicated Control Channel) processed sends data transmission to handheld terminal and asks
It asks；
2, after handheld terminal receives the data transfer request of M wireless sensor node, by SDCCH channel by the request
It is sent to base station；
3, after the request is permitted in base station, new a wireless energy and data transfer cycle are opened, and set the duration
For T；
4, a wireless sensor node of any m (1≤m≤M) passes through CPICH Common Pilot Channel (CPICH, Common Pilot
Channel channel fading coefficient h) is obtainedn,mAnd hm,H, and handheld terminal is sent it to by SDCCH channel；
5, it after handheld terminal receives the channel fading coefficient of M wireless sensor node, is sent to by SDCCH channel
To base station；
6, after base station obtains the channel fading coefficients of whole M wireless sensor nodes, carry out the wireless energy transfer time with
The distribution of wireless data transmission time:
Distributing to all time of N number of WPT emission sources for concurrent transmission energy is It is the solution of following equation.
Wherein,It is any m (1≤m
≤ M) a sensor node efficiency of energy collection, any a sensor node of m (1≤m≤M) using part receive energy into
The transmission of row data, the ratio are θm(0<θm≤1)；
The time for distributing to any m (1≤m≤M) a wireless sensor node transmission data is
7, base station is by above-mentioned energy transmission time and data transmission period allocation result, i.e.,WithIt is logical
SDCCH channel feedback is crossed to N number of WPT emission source and handheld terminal；
8, handheld terminal is by above-mentioned energy transmission time and data transmission period allocation result, i.e.,WithM wireless sensor node is transmitted to by SDCCH channel；
9, the energy transmission stage: any n-th (1≤n≤N) a WPT emission source sets its transmission power as Pn；It is all N number of
WPT emission source concurrent transmission energy, duration be
10, data transfer phase: a sensor node of any m (1≤m≤M) is in the respectively assigned periodIt is interior
Information is sent to handheld device, the average transmission power of m-th of sensor node is set as
11, this wireless energy and the data transfer ends turn to step 1 and start next wireless energy and data transmission week
Phase.
In step 1 and step 2, the distance of wireless sensor node and handheld terminal is generally at 1 meter or so, wireless sensor
Generally at 100 meters or more, wireless sensor node is limited the distance of node and base station by transmission power, can only and closely
Handheld terminal communication, and can not be with base station direct communication.Handheld terminal then has stronger telecommunication ability, can and base
It stands communication.Therefore, the data transfer request of wireless sensor node must first be sent to handheld terminal, then be forwarded by handheld terminal
To base station；
In step 4 neutralization procedure 5, the distance of wireless sensor node and WPT emission source is wireless to pass generally within 3 meters
Sensor node can emit sources traffic with WPT and obtain channel fading coefficient hn,m；Wireless sensor node can also and handheld terminal
Communication obtains channel fading coefficient hm,H(1≤m≤M).Wireless sensor node is after obtaining above-mentioned channel fading coefficient, it is necessary to
Handheld terminal is first sent it to, then base station is forwarded to by handheld terminal；
In step 6, system will improve under the premise of meeting M wireless sensor node minimum data transmission rate requirements
The utilization rate of Internet resources can be modeled as following mathematical optimization problem
Constraint condition:
By solving above-mentioned optimization problem, base station obtains the optimal energy transmission time and data transmission period distribution knot
Fruit, i.e.,WithAs shown in formula (1) and formula (2)；
In step 7 and step 8, base station and wireless sensor node are unable to direct communication, and base station needs to first pass through SDCCH letter
Road is by energy transmission time and data transmission period allocation result, i.e.,WithIt is sent to handheld terminal, then
Above- mentioned information are forwarded to by M wireless sensor node by SDCCH channel by handheld terminal.
Inventions have been Multi simulation running experiments, and specific embodiment and its performance evaluation is described below.Referring to Fig.1
When the wireless energy transfer provided using the wireless body area network system composition schematic diagram and Fig. 2 of wireless charging technology provided
Between and wireless data transmission time allocation plan schematic diagram, make following parameter setting: WBAN working space is long 9m, width 9m, height
The room of 3m, 4 WPT energy transmitting sources are mounted on room top plate, coordinate be respectively (3.3m, 3.3m, 3m), (6.6m, 3.3m,
3m),(3.3m,6.6m,3m),(6.6m,6.6m,3m)；4 wireless sensor nodes for human body monitoring with human body along
The diagonal line in room is mobile, selectes 5 position sampling sensor node handling capacities obtained, the coordinate difference of this 5 positions
For (1m, 1m, 1m), (3m, 3m, 1m), (5m, 5m, 1m), (7m, 7m, 1m), (9m, 9m, 1m).The transmitting in WPT energy transmitting source
Power PnIt is set as 20dBm, by the efficiency of energy collection ζ of sensor nodemIt is set as 0.75.For each sensor node,
Assuming that ratio θ shared by the energy for being used to carry out data transmission in collected energymIt is 0.5, signal bandwidth w is 1MHz, hand
Hold the noise power σ of terminal2For -114dBm.WPT energy transmitting source and wireless sensor node work are in same frequency range, path
Loss index is 3.8, and body shadow fading is that a mean value is the Gaussian distributed random variable that 0 variance is 14dB.In order to illustrate
The present invention proposes that the advantage of method, the present invention also carry out " overall rate maximization " method and " forcing phase same rate " method
It emulates and compares.
Referring to Fig. 3, introduces and use position at 5, using the wireless energy transfer time proposed by the invention and without line number
According to transmission time allocation plan, and " overall rate maximization " method and " forcing phase same rate " method, various methods obtain
The comparison schematic diagram of overall data transmission rate.
Referring to Fig. 4, introduces and use position at 5, using the wireless energy transfer time proposed by the invention and without line number
According to transmission time allocation plan, and " overall rate maximization " method and " forcing phase same rate " method, each wireless sensor
The comparison schematic diagram of node acquisition message transmission rate.
It was found from Fig. 3 and Fig. 4, it can be seen that " overall rate maximization " method achieves maximum overall data transmission speed
Rate, but as shown in figure 4, " overall rate maximization " method that maximum data transfer rate is also produced between sensor node is poor
Different, this illustrates although this method achieves best system effectiveness but results in the serious justice of internodal data transmission rate
Property.On the contrary, as shown in figure 3, " force phase same rate " method is minimum in the overall data transmission rate of acquisition, but can from Fig. 4
To find out, " forcing phase same rate " method is to the almost the same message transmission rate of each sensor node of system distribution.This explanation,
" forcing phase same rate " realizes sensor node and obtains the absolute fairness of data rate, however but has lost system and integrally imitate
Rate.Different from " overall rate maximization " method and " forcing phase same rate " method, method proposed by the invention can be whole
A preferable compromise is obtained between the message transmission rate obtained between volume data transmission rate and each node, it may be assumed that this method institute
Compared to " forcing phase same rate ", method increases considerably the overall data transmission rate of acquisition, but useful preferable wireless communication
The wireless sensor node in road can obtain higher message transmission rate.
Referring to Fig. 5, introduces and use position at 5, using the wireless energy transfer time proposed by the invention and without line number
According to transmission time allocation plan, and " overall rate maximization " method and " forcing phase same rate " method, various methods obtain
Fair sex index comparison schematic diagram, the range of fair sex index is [0,1], when fair sex index is smaller, is illustrated between node
The message transmission rate otherness of acquisition is bigger；When fair sex index is bigger, illustrate the message transmission rate obtained between node
Otherness is smaller.
From fig. 5, it can be seen that the fair sex index that " overall rate maximization " method obtains always is lower than 0.4, " phase is forced
The fair sex index of same rate " method close to 1, the fair sex index that method proposed by the invention obtains always greater than 0.9,
This illustrates that method proposed by the invention obtains preferable fairness.The above description of test, emulation experiment of the invention are successes
, realize the purpose of invention.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (3)
1. the energy and data transmission period distribution method of a kind of WBAN using WPT technology, which is characterized in that including following step
It is rapid:
S01: any m-th of wireless sensor node obtains channel fading coefficient by CPICH Common Pilot Channel (CPICH), and passes through
SDCCH channel sends it to handheld terminal；After handheld terminal receives the channel fading coefficient of M wireless sensor node, lead to
It crosses SDCCH channel and sends it to base station；
S02: after base station obtains the channel fading coefficient of whole M wireless sensor nodes, all N number of WPT emission sources is distributed to and are used
It is in the time of concurrent transmission energy It is the solution of following equation:
Wherein,ζmIt is the collection of energy effect of any m-th of sensor node
Rate, any m-th of sensor node, which receives energy using part, to carry out data transmission, which is θm, hn,mIndicate n-th of WPT
The fading coefficients of channel, h between emission source and m-th of sensor nodem,HIt indicates any m-th of sensor node and holds eventually
The fading coefficients of channel, t between endmThe data transmission period of any m-th of sensor node is distributed in expression, and T indicates system
In any energy and data transfer cycle duration, σ2Indicate the noise power of system wireless channel, PnIndicate any n-th of WPT
The transmission power of emission source；
S03: the time of any m-th of wireless sensor node transmission data is distributed to are as follows:
S04: base station willWithN number of WPT emission source and handheld terminal are given by SDCCH channel feedback；Handheld terminal willWithM wireless sensor node is transmitted to by SDCCH channel.
2. the energy and data transmission period distribution method of the WBAN according to claim 1 using WPT technology, feature
It is, the allocation result of energy transmission time and data transmission period are obtained by following steps:
S11: it is modeled as mathematical optimization problem:
S12: constraint condition is obtained:
Wherein, RmFor the utilization rate of Internet resources, w indicates the occupied spectral bandwidth of system, PmFor m-th sensor node
Average transmission power；
S13: by solving above-mentioned optimization problem, the optimal energy transmission time and data transmission period allocation result is obtained.
3. the energy and data transmission period distribution method of the WBAN according to claim 1 using WPT technology, feature
It is, before the step S01 further include:
Before any one wireless energy and data transfer cycle start, M wireless sensor node passes through standalone dedicated control channel
(SDCCH) data transfer request is sent to handheld terminal；
After handheld terminal receives the data transfer request of M wireless sensor node, sent the request to by SDCCH channel
Base station；
After the request is permitted in base station, new a wireless energy and data transfer cycle are opened, and set the duration as T.
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