WO2017113102A1 - 无线体域网功率控制方法及系统、发射节点 - Google Patents

无线体域网功率控制方法及系统、发射节点 Download PDF

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Publication number
WO2017113102A1
WO2017113102A1 PCT/CN2015/099466 CN2015099466W WO2017113102A1 WO 2017113102 A1 WO2017113102 A1 WO 2017113102A1 CN 2015099466 W CN2015099466 W CN 2015099466W WO 2017113102 A1 WO2017113102 A1 WO 2017113102A1
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WIPO (PCT)
Prior art keywords
packet
time
acceleration sensor
transmitting node
valley
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English (en)
French (fr)
Inventor
李烨
臧威麟
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Shenzhen Institute of Advanced Technology of CAS
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Shenzhen Institute of Advanced Technology of CAS
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Priority to KR1020177012070A priority Critical patent/KR102263526B1/ko
Priority to CN201580001210.5A priority patent/CN105659670B/zh
Priority to PCT/CN2015/099466 priority patent/WO2017113102A1/zh
Publication of WO2017113102A1 publication Critical patent/WO2017113102A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission taking into account the speed of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission

Definitions

  • the present invention relates to the field of wireless body area network technologies, and in particular, to a wireless body area network power control method and system, and a transmitting node.
  • Wireless body area network nodes are usually small in size and cannot be equipped with large-capacity batteries. Frequent battery replacement can cause great inconvenience to the wearer. Therefore, designing an energy-efficient communication mechanism is of great significance to the wireless body area network.
  • the power control algorithm can dynamically adjust the transmit power of the wireless node according to the current channel quality in real time. Therefore, there are a large number of power control algorithms in the field of wireless body area networks.
  • the existing wireless body area network power control algorithm generally adopts a closed-loop feedback mechanism.
  • the transmitting node first sends a packet according to the initial power level, and the receiving node detects the received data strength after receiving the packet, that is, RSSI, if it is within a preset threshold range. Then the transmission power is not changed. Above this range, the next transmission power is reduced, and below this range, the transmission power is increased. The updated power level value will be put into the feedback control packet and fed back to the transmitting node. After the control packet is sent, the transmitting node adjusts the transmitting power of the next packet according to the received power level value. The whole process is shown in Figure 1. In recent years, many foreign research results in this area have adopted the closed-loop power control system framework shown in Figure 1.
  • the current power control algorithm requires continuous interleaving to sample the changed channels to achieve effective tracking of channel changes, thus providing the necessary basis for the power control algorithm.
  • some physiological signals have a low sampling rate, a long packet period, and a large swing in some positions (such as at the wrist or ankle) causes the channel to change faster, so that the interaction of the packets alone cannot keep up with the channel. Changes, so additional empty packets need to be sent to complete the sampling of the channel, thus reducing the energy efficiency of the original power control algorithm.
  • Embodiments of the present invention provide a wireless body area network power control method for simultaneously ensuring communication quality and energy consumption effectiveness, and the method includes:
  • the transmitting node After receiving the last control packet, the transmitting node adjusts the transmit power level according to the transmit power level value carried in the previous control packet, determines the time of sending the packet according to the sampled value of the local acceleration sensor, and sends the data packet to the receiving node at the time of sending the packet;
  • the transmitting node receives a control packet fed back according to the data packet, where the control packet carries a next transmit power level value determined according to the received data strength of the data packet;
  • the transmitting node adjusts the transmission power level according to the value of the transmission power level carried in the control packet, determines the time of sending the packet according to the sampling value of the local acceleration sensor, and sends the next data packet to the receiving node at the time of sending the packet.
  • the embodiment of the invention further provides a wireless body area network power control system for simultaneously ensuring communication quality and energy consumption effectiveness, the system comprising a transmitting node and a receiving node, wherein:
  • the transmitting node After receiving the last control packet, the transmitting node adjusts the transmit power level according to the value of the transmit power level carried in the previous control packet, determines the time of sending the packet according to the sampled value of the local acceleration sensor, and sends the data packet to the receiving node at the time of sending the packet;
  • the transmitting node is further configured to: after receiving the control packet, adjust a transmit power level according to a transmit power level value carried in the control packet, determine a packet sending time according to the local acceleration sensor sample value, and send a next data packet at the time of the packet sending.
  • An embodiment of the present invention provides a transmitting node in a wireless body area network to ensure communication quality and energy consumption efficiency at the same time.
  • the transmitting node includes:
  • a receiving module configured to receive a control packet
  • a time determination module configured to determine a time of sending a packet according to a sample value of the local acceleration sensor
  • a sending module configured to adjust a transmit power level according to a transmit power level value carried in the control packet, and send a data packet to the receiving node at a time of sending the packet determined by the time determining module, where the receiving module receives the previous control packet, and the transmit power level It is adjusted according to the value of the transmit power level carried in the previous control packet.
  • the transmitting node after receiving the last control packet, the transmitting node adjusts the transmit power level according to the transmit power level value carried in the previous control packet, determines the time of sending the packet according to the sampled value of the local acceleration sensor, and sends the packet to the receiving node at the time of sending the packet.
  • the transmitting node receives a control packet fed back according to the data packet, and the control packet carries The next transmit power level value determined according to the received data strength of the data packet; the transmitting node adjusts the transmit power level according to the transmit power level value carried in the control packet, and determines the packet delivery time according to the local acceleration sensor sample value, at the time of the packetization Sending the next data packet to the receiving node; in this cycle, considering that many human actions generally have periodic characteristics for power control, not only controlling the power of the packet but also controlling the time of sending the packet, which is advantageous for maintaining the transmission power. A lower level while ensuring communication quality and energy efficiency.
  • FIG. 1 is a schematic diagram of a frame of a closed loop power control system in the background art
  • FIG. 2 is a schematic diagram of a method for controlling a power of a wireless body area network according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of sampling values of RSSI and acceleration sensors according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a specific example of positioning a packet delivery time according to an embodiment of the present invention.
  • FIG. 5 is a diagram showing an example of determining an amplitude reading of an acceleration sampling value trough in an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a wireless body area network power control system according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a transmitting node in a wireless body area network according to an embodiment of the present invention.
  • FIG. 8 is a graph showing a trajectory experiment of power level adjustment according to an embodiment of the present invention.
  • the power control algorithm can dynamically adjust the transmit power of the wireless node according to the current channel quality in real time, and has a lot of research results in the field of wireless body area network.
  • the inventor has found that the power control algorithm is mainly aimed at the change of the channel quality caused by the change of the human body posture, and many human body actions generally have periodicity, such as walking, running, going up and down the building, and riding a bicycle, so that the corresponding channel attenuation also has Similar periodicity.
  • the traditional power control algorithm does not consider this feature, and the performance is greatly degraded when the dynamic amplitude of the human body is large and fast. Therefore, in this embodiment, a wireless body domain using the regular motion of the human body is proposed in the embodiment of the present invention. Network power control method.
  • a wireless body area network power control method is designed, which not only controls the power of the packet but also controls the time of sending the packet, and can maintain the transmission power at a constant time. Low level, while ensuring communication quality and energy efficiency, and achieving better results.
  • FIG. 2 is a schematic diagram of a method for controlling a power of a wireless body area network according to an embodiment of the present invention. As shown in FIG. 2, the method for controlling a power of a wireless body area network according to an embodiment of the present invention may include:
  • Step 201 After receiving the last control packet, the transmitting node adjusts the transmit power level according to the value of the transmit power level carried in the previous control packet, determines the time of sending the packet according to the sampled value of the local acceleration sensor, and sends a data packet to the receiving node at the time of sending the packet;
  • Step 202 The transmitting node receives a control packet fed back according to the data packet, where the control packet carries a next transmit power level value determined according to the received data strength of the data packet;
  • Step 203 The transmitting node adjusts a transmit power level according to a transmit power level value carried in the control packet, determines a packet sending time according to the local acceleration sensor sample value, and sends a next data packet to the receiving node at the sending time.
  • the transmitting node sends the first data packet to the receiving node according to the initial transmit power level at the initial packet sending time.
  • multi-sensor data fusion can be adopted in a wireless body area network environment, and power control is performed by using a periodic regular action of the human body.
  • a strongly dynamic channel can be converted into a stable and reliable channel, so that the power is always maintained at a very low level, while ensuring communication quality and energy consumption effectiveness.
  • the arrangement of the delivery time can use the information of the dynamic change of the human body posture acquired by the acceleration sensor.
  • the wireless body area network power control method of the embodiment of the present invention is triggered immediately.
  • the transmitting node finds the best time for sending packets according to the value collected by the local acceleration, and performs power adjustment at the same time.
  • the wireless transceiver can adopt the CC2420 chip supporting the IEEE802.15.4 standard, and the acceleration sensor can adopt the FreescaleMMA8451Q.
  • the transmitting node determines the time of sending the packet according to the sampling value of the local acceleration sensor, and may include: the transmitting node determines the moment when the channel attenuation is minimum according to the sampling value of the local acceleration sensor; and the time when the transmitting node minimizes the channel attenuation is determined as the time of sending the packet. That is, each time a packet is transmitted at the moment when the channel attenuation is minimal. In this way, even if the human body changes greatly (such as walking, running) or the frequency of the packet is not very fast (such as a packet of 1 second), it is still possible to convert a dynamically changing channel into a stable and reliable channel. Therefore, the transmission power is always kept at a very low level, and the communication quality and energy consumption are ensured, and a good effect is obtained.
  • the implementation principle and process of the wireless body area network power control method in the embodiment of the present invention are described below by using specific examples.
  • the first step in implementation is to establish the relationship between wireless channel attenuation and human body swing.
  • a deployment of the most typical wireless body area network node is considered, that is, the transmitting node and the receiving node are respectively at the wrist position and the pants pocket of the human body.
  • the channel quality of the wireless body area network is mainly affected by the swing of the human body.
  • the occlusion of the communication link by the body during the swing process will result in a large signal attenuation, and the attenuation of the direct communication link is small.
  • the human pose usually produces periodic oscillations, causing the occlusion and directness of the communication link to alternate, so the RSSI of the receiving point will assume the shape of a noisy sine wave. If the location of the RSSI peak is selected at the time of the packet delivery, a high quality communication channel can be guaranteed, even if the human body is undergoing relatively strong motion.
  • the acceleration sensor can measure the motion, so the action of the transmitting node can be sensed after the acceleration node is equipped with the acceleration sensor. Since the channel quality is mainly affected by the swing of the human body, the attenuation of the communication link and the sampling value of the acceleration sensor are bound to have a strong correlation.
  • the CC2420 chip can be used for wireless transmission and reception.
  • the CC2420 is a wireless communication module of the IEEE802.15.4 standard produced by TI. It uses a frequency of 2.4 GHz and is based on Direct Sequence Spread Spectrum (DSSS) technology. It can provide a transmission rate of 250 kb/s and supports adjustment of 32 power levels online. There are 16 available channels at 2.4 GHz.
  • the CC2420 transmits 20 data packets in one second with a transmission power of 0 dBm, and the receiving node records the RSSI value after receiving the signal.
  • the acceleration sampling value of the transmitting node can be put into the transmission packet for transmission, so that the receiving RSSI and the simultaneous acceleration sampling value can be simultaneously recorded, and the experimental result can be The principles of the invention are demonstrated.
  • the human motion measurement can be performed using the FreescaleMMA8451Q triaxial acceleration sensor.
  • the MMA8451Q measures acceleration signals from 3 axes and supports adjustable 3 sensitivity levels: ⁇ 2g, ⁇ 4g and ⁇ 8g.
  • the sampling frequency can be set to 25 Hz.
  • the RSSI and acceleration sensor samples collected at the same time are put together, as shown in Figure 3, where the dotted line represents the acceleration sensor samples (Acceleration Signals) and the solid line represents the received RSSI.
  • the experimental subjects in this scene walk at a speed of -5 Km/s. Therefore, it can be concluded that the human body's motion and channel quality have a strong correlation, and this correlation can be used to achieve the optimal delivery time.
  • the second step needs to be implemented to locate the time of dispatching by using the acceleration sensor sample value.
  • the transmitting node locates the acceleration sampling value and the valley time of each cycle can locate the optimal time of sending packets. That is, the transmitting node determines the moment when the channel attenuation is minimum according to the local acceleration sensor sample value, and may include: the transmitting node determines the valley time of each period of the local acceleration sensor sample value as the time when the channel attenuation is the smallest.
  • the transmitting node determines the trough time of each period of the local acceleration sensor sampling value as the time when the channel attenuation is the smallest, in order to further improve the accuracy of the processing result, the following processing may be performed: the transmitting node samples the local acceleration sensor The value is smoothed; the valleyd waveform matching is performed on the sampled value of the smoothed local acceleration sensor; the valley time interval is detected on the sampled value of the local acceleration sensor successfully matched by the valley waveform; and the local acceleration sensor in which the detection result of the valley time interval meets the predetermined condition The sampled value is used to detect the valley amplitude; the valley time corresponding to the sampling value of the local acceleration sensor that matches the peak amplitude detection result to the predetermined condition is determined as the time at which the channel attenuation is the smallest.
  • the valley time interval detection result meets a predetermined condition, and may include: a time interval between two consecutive troughs is in a range of 70%; and/or, the trough amplitude detection result meets a predetermined condition, and may include: a current detection trough The amplitude sample value is less than half the amplitude of the cycle.
  • FIG. 4 is a flow chart of a specific example of locating the time of sending a packet in this example.
  • the transmitting node first smoothes the acceleration signal through a third-order median filter, and then uses the following three conditions to determine the time of the packet:
  • the time interval is detected, that is, the time interval between consecutive troughs must be within 70%.
  • the sampled value of the currently detected trough must be less than half of the amplitude of the period, as shown in FIG. Fig. 5 shows an example of judging the amplitude reading of the acceleration sample value trough in this example.
  • the best delivery time can be determined and kept tracked.
  • the third step that needs to be implemented is to adjust the transmit power using power control.
  • the generated data packet first exists in the buffer waiting for the transmission time.
  • the quality of the equivalent channel is very stable, and the power control is performed, so that the transmission power can be kept at a low level.
  • the specific power control process a closed-loop feedback mechanism may be adopted.
  • the transmitting node first sends a packet according to the initial power level, and the receiving node detects the received data strength after receiving the packet, that is, the RSSI. If the transmitting threshold is within a preset threshold, the transmitting power is not change. Above this range, the next transmission power is reduced, and below this range, the transmission power is increased. The updated power level value will be placed in the opposite
  • the feedback control packet is fed back to the transmitting node. After the control packet is sent, the transmitting node adjusts the transmitting power of the next packet according to the received power level value.
  • the first transmission can use a higher power, such as 0 dBm, and the RSSI value is calculated after receiving the data packet. If it is within the threshold range (-80 dBm to -85 dBm), then no need to perform any operating. If it is higher than this threshold, the receiving node calculates the value that needs to be reduced, and puts it in the control packet and feeds back to the transmitting node. If it is lower than this threshold, the receiving node calculates the value that needs to be added, and puts it in the control packet and feeds it back to the transmitting node.
  • an RL-TPC power control algorithm can be used, which uses the received RSSI value to obtain a weighted average according to Equation 1:
  • w(x i ) is the weighting coefficient of each RSSI
  • x i represents the ith of the n sequences, where n is 10.
  • E[x] is the calculated weighted average and is used to compare against the threshold.
  • the embodiment of the present invention further provides a wireless body area network power control system and a transmitting node in a wireless body area network, as described in the following embodiments. Since the system and the transmitting node solve the problem similarly to the foregoing wireless body area network power control method, the implementation of the system and the transmitting node can be referred to the implementation of the foregoing wireless body area network power control method, and the repeated description is not repeated.
  • FIG. 6 is a schematic diagram of a wireless body area network power control system according to an embodiment of the present invention. As shown in FIG. 6, the system may include a transmitting node and a receiving node, where:
  • the transmitting node After receiving the last control packet, the transmitting node adjusts the transmit power level according to the value of the transmit power level carried in the previous control packet, determines the time of sending the packet according to the sampled value of the local acceleration sensor, and sends the data packet to the receiving node at the time of sending the packet;
  • the transmitting node is further configured to: after receiving the control packet, adjust a transmit power level according to a transmit power level value carried in the control packet, determine a packet sending time according to the local acceleration sensor sample value, and send a next data packet at the time of the packet sending.
  • the transmitting node may be further configured to: send the first data packet to the receiving node according to the initial transmit power level at the initial packet sending time.
  • the transmitting node may be specifically configured to: determine a moment when the channel attenuation is minimum according to the local acceleration sensor sample value; and determine a time when the channel attenuation is the minimum as a packet sending time.
  • the transmitting node may be specifically configured to: determine a valley time of each period of the local acceleration sensor sample value as a time when the channel attenuation is the smallest.
  • the transmitting node may be specifically configured to:
  • the valley time corresponding to the sampling value of the local acceleration sensor that matches the peak amplitude detection result to the predetermined condition is determined as the time at which the channel attenuation is the smallest.
  • the valley time interval detection result meets a predetermined condition, and may include: a time interval between two consecutive troughs is in a range of 70%;
  • the valley amplitude detection result meets a predetermined condition, and may include: the amplitude sampling value of the current detection valley is less than half of the amplitude of the period.
  • FIG. 7 is a schematic diagram of a transmitting node in a wireless body area network according to an embodiment of the present invention. As shown in FIG. 7, the transmitting node may include:
  • a receiving module configured to receive a control packet
  • a time determination module configured to determine a time of sending a packet according to a sample value of the local acceleration sensor
  • a sending module configured to adjust a transmit power level according to a transmit power level value carried in the control packet, and send a data packet to the receiving node at a time of sending the packet determined by the time determining module, where the receiving module receives the previous control packet, and the transmit power level It is adjusted according to the value of the transmit power level carried in the previous control packet.
  • the sending module can be further used to:
  • the first data packet is transmitted to the receiving node at the initial transmission power level.
  • the sending module is specifically configured to:
  • the time at which the channel attenuation is minimized is determined according to the local acceleration sensor sample value; the time at which the channel attenuation is minimized is determined as the time of the packet transmission.
  • the sending module is specifically configured to:
  • the valley time of each period of the local acceleration sensor sample value is determined as the time at which the channel attenuation is the smallest.
  • the sending module is specifically configured to:
  • the valley time corresponding to the sampling value of the local acceleration sensor that matches the peak amplitude detection result to the predetermined condition is determined as the time at which the channel attenuation is the smallest.
  • the valley time interval detection result meets a predetermined condition, and may include: a time interval between two consecutive troughs is in a range of 70%;
  • the valley amplitude detection result meets a predetermined condition, and may include: the amplitude sampling value of the current detection valley is less than half of the amplitude of the period.
  • FIG. 8 illustrates a power level variation curve of the case where the subject is walking while using the regular action of the human body and the regular action of the human body.
  • AA-TPC is the power control algorithm of the embodiment of the present invention
  • RL-TPC is the prior art. Power control algorithm. It can be clearly seen that the power control algorithm using the regular action of the human body keeps the transmission power level at the lowest level for most of the time. Therefore, it is verified by an example that the embodiment of the present invention can greatly improve the wireless body area network power control algorithm. Performance.
  • the embodiment of the present invention utilizes the regular action of the human body to fuse the acceleration sensor data and the RSSI data, combines the control packet sending time and the packet sending power, and reduces the transmission power.
  • each time the data packet is transmitted at the moment when the channel attenuation is minimum such that even if the human body changes greatly (such as walking, running) or the frequency of the packet is not very fast (for example, one packet per second)
  • it is still possible to convert a dynamically changing channel into a stable and reliable channel thereby keeping the transmission power at a very low level, while ensuring communication quality and energy consumption effectiveness, and obtaining good results.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种无线体域网功率控制方法及系统、发射节点，其中方法包括：发射节点接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；发射节点接收根据该数据包反馈的控制包，该控制包携带根据该数据包的接收数据强度确定的下一次的发射功率等级值；发射节点根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送下一个数据包。本发明不但可以控制发包功率而且也可以控制发包时间，同时保证了通信质量和能耗有效性。

Description

无线体域网功率控制方法及系统、发射节点 技术领域
本发明涉及无线体域网技术领域，尤其涉及无线体域网功率控制方法及系统、发射节点。
背景技术
随着全世界老龄化人口和亚健康人群的不断增加，由于医疗资源(预算支出、医生、护士和病床等)相对不足，使得医疗保健系统的发展成为全球所面临的共同需求。作为一种新型的普适医疗保健、疾病监控和预防的解决方案，无线体域网受到了业界广泛的关注。无线体域网节点通常尺寸很小，无法配置大容量电池，而且频繁的更换电池会给穿戴者带来极大的不便，所以设计高能效的通信机制对无线体域网来说具有重要意义。和传统的无线传感器网络不同，由于穿戴者会经常处于移动的状态，因此无线体域网的应用环境具有动态性，固定一个发射功率对无线节点来说会导致很低的能效或不可靠的通信质量。功率控制算法可以实时动态的根据当前信道质量来调整无线节点的发射功率，因此在无线体域网领域有大量的功率控制算法的研究成果。
现有的无线体域网功率控制算法一般采用闭环反馈的机制，发射节点先按初始功率等级发包，接收节点收到包后检测接收数据强度，也就是RSSI，如果在预先设定的门限范围内则发射功率不改。高于这个范围的话就减少下次发射功率，低于这个范围就增加发射功率。更新后的功率等级值将放入到反馈控制包里反馈给发射节点，控制包发送后，发射节点根据收到的功率等级值来调整下个包的发射功率。整个过程如图1所示。近年来，国外有很多在此方面的研究成果均采用图1所示的闭环功率控制系统框架。
目前的功率控制算法要求不断的交互发包来对变化的信道进行采样，实现对信道变化的有效跟踪，从而为功率控制算法提供必要的基础。但有些生理信号的采样率低，发包周期比较长，而且某些位置(比如手腕或脚踝处)的大幅度摆动导致信道变化比较快，这样一来仅仅依靠数据包的交互不能够跟上信道的变化，因此需要发送额外的空数据包来完成对信道充足的采样，从而降低原有功率控制算法的能耗有效性。
发明内容
本发明实施例提供一种无线体域网功率控制方法，用以同时保证通信质量和能耗有效性，该方法包括：
发射节点接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
发射节点接收根据该数据包反馈的控制包，该控制包携带根据该数据包的接收数据强度确定的下一次的发射功率等级值；
发射节点根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送下一个数据包。
本发明实施例还提供一种无线体域网功率控制系统，用以同时保证通信质量和能耗有效性，该系统包括发射节点和接收节点，其中：
发射节点用于接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
接收节点用于接收该数据包后检测接收数据强度，根据接收数据强度确定下一次的发射功率等级值，向发射节点反馈携带下一次的发射功率等级值的控制包；
发射节点还用于接收该控制包后，根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻发送下一个数据包。
本发明实施例提供一种无线体域网中的发射节点，用以同时保证通信质量和能耗有效性，该发射节点包括：
接收模块，用于接收控制包；
时刻确定模块，用于根据本地加速度传感器采样值确定发包时刻；
发送模块，用于根据控制包中携带的发射功率等级值调整发射功率等级，在时刻确定模块确定的发包时刻向接收节点发送数据包，其中，接收模块接收的是上一个控制包，发射功率等级是根据上一个控制包中携带的发射功率等级值调整的。
本发明实施例中，发射节点接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；发射节点接收根据该数据包反馈的控制包，该控制包携带 根据该数据包的接收数据强度确定的下一次的发射功率等级值；发射节点根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送下一个数据包；如此循环往复，考虑到很多人体的动作一般会具有周期性这一特性而进行功率控制，不但控制发包功率而且也可以控制发包时间，这样有利于将发射功率保持一个较低的等级，同时保证通信质量和能耗有效性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。在附图中：
图1为背景技术中闭环功率控制系统框架示意图；
图2为本发明实施例中无线体域网功率控制方法的示意图；
图3为本发明实施例中RSSI和加速度传感器采样值的示意图；
图4为本发明实施例中定位发包时刻的具体实例图；
图5为本发明实施例中对加速度采样值波谷的幅度读数进行判断的示例图；
图6为本发明实施例中无线体域网功率控制系统的示意图；
图7为本发明实施例中无线体域网中的发射节点的示意图；
图8为本发明实施例中功率等级调整的轨迹实验曲线图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚明白，下面结合附图对本发明实施例做进一步详细说明。在此，本发明的示意性实施例及其说明用于解释本发明，但并不作为对本发明的限定。
功率控制算法可以实时动态的根据当前信道质量来调整无线节点的发射功率，在无线体域网领域有大量的研究成果。发明人发现，功率控制算法主要针对人体姿态变化造成的信道质量的变化，而很多人体的动作一般会具有周期性，比如走、跑、上下楼和骑自行车等，因此造成相应的信道衰减也具有类似的周期性。传统的功率控制算法没有考虑这一特性，在人体动态幅度较大和较快的情况下性能下降的很大，因此针对这一点，在本发明实施例中提出一种利用人体规则动作的无线体域网功率控制方法。具体的，本 发明实施例通过利用人体某些日常行为动作的周期性这一特点，设计了一种不但控制发包功率而且也可以控制发包时间的无线体域网功率控制方法，可以将发射功率始终保持在一个较低的等级，同时保证通信质量和能耗有效性，获得较好的效果。
图2为本发明实施例中无线体域网功率控制方法的示意图，如图2所示，本发明实施例中无线体域网功率控制方法可以包括：
步骤201、发射节点接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
步骤202、发射节点接收根据该数据包反馈的控制包，该控制包携带根据该数据包的接收数据强度确定的下一次的发射功率等级值；
步骤203、发射节点根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送下一个数据包。
具体的实施例中，发射节点在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
实施例中，可以在无线体域网环境下采用多传感器数据融合，利用人体周期性规则动作进行功率控制。合理控制每次发包的时刻，就可以将一个强烈动态变化的信道转换成一个稳定可靠的信道，使得功率始终保持一个很低的等级，同时保证了通信质量和能耗有效性。其中发包时刻的安排可以利用加速度传感器获取的人体姿态动态变化的信息。当节点识别出行走的人体姿态时，立即触发本发明实施例的无线体域网功率控制方法。发射节点根据本地加速度采集的值来寻找最佳的发包时刻，同时进行功率调整。实施例中无线收发可以采用支持IEEE802.15.4标准的CC2420芯片，加速度传感器可以采用FreescaleMMA8451Q。
实施例中，发射节点根据本地加速度传感器采样值确定发包时刻，可以包括：发射节点根据本地加速度传感器采样值，确定信道衰减最小的时刻；发射节点将信道衰减最小的时刻确定为发包时刻。也就是说，每次数据包发送在信道衰减最小的时刻。这样，即使由于人体大幅度动态变化(比如走，跑)或是发包频率并不是很快(比如1秒一个包)的情况下，仍然可以将一个动态变化的信道转换成一个稳定可靠的信道，从而将发射功率始终保持在一个很低的等级，同时保证了通信质量和能耗有效性，获得了较好的效果。
下面以具体实例说明本发明实施例中无线体域网功率控制方法的实施原理和过程。实施时第一步需要考虑的是，建立无线信道衰减和人体摆动的关系。
本例中考虑一种最典型的无线体域网节点的部署，即发射节点和接收节点分别在人体的手腕位置和裤子口袋处。无线体域网信道质量主要受人体的摆动的影响，在摆动过程中身体对通信链路的遮挡会导致较大的信号衰减，反之直达的通信链路的衰减就很小。人的姿态通常会产生周期性的摆动，造成通信链路的遮挡和直达这两种情况的交替出现，因此接收点的RSSI会呈现一种带噪声的正弦波的形状。如果发包时刻选择在RSSI波峰的位置，那么就可以保证一个高质量的通信信道，哪怕人体正在进行比较强的运动。
加速度传感器可以对运动进行测量，因此在发射节点上配备加速度传感器后可以对该发射节点的行动进行感知。由于信道质量主要受人体的摆动的影响，因此通信链路的衰减和加速度传感器采样值必然会有很强的相关性。实施例中可以采用CC2420芯片进行无线收发。CC2420是TI公司生产的IEEE802.15.4标准的无线通信模块，使用的频率为2.4GHz，基于直接序列扩频(DSSS)技术，能够提供250kb/s的传输速率，支持在线32个功率等级的调整。2.4GHz有16个可用信道。为了进行信道衰减的测量，本例中CC2420以0dBm的发射功率一秒钟发20个数据包，接收节点接收到信号后记录下RSSI值。为了获得通信链路的衰减和加速度传感器采样值的关系，实验中可以将发射节点的加速度采样值放入发送包进行传输，这样接收RSSI和同时刻的加速度采样值可以同时记录下来，实验结果可以证明本发明的原理。
本例中人体动作的测量可以采用FreescaleMMA8451Q三轴加速度传感器。MMA8451Q可以测量3个轴的加速度信号以及支持可调的3个灵敏度：±2g、±4g和±8g。本例中采样频率可设定为25Hz。
为了更好的说明，将同时采集的RSSI和加速度传感器采样值放在一起，如图3所示，其中虚线代表加速度传感器采样值(Acceleration Signals)，实线代表接收RSSI。本例中此场景中的实验对象以-5Km/s的速度进行行走。因此可以得出人体的动作和信道质量有很强的相关性，利用这种相关性可以实现最佳发包时刻的选择。
第二步需要实施的是，利用加速度传感器采样值定位发包时刻。
由图3可以观察到加速度采样值和接收RSSI呈现相同的周期变化，且正好相差一个周期。也就是说加速度传感器采样值的每个周期的波谷对应着信道衰减最小的时刻。因此发射节点定位加速度采样值每个周期的波谷时刻就可以定位最佳的发包时刻。即在 实施例中，发射节点根据本地加速度传感器采样值，确定信道衰减最小的时刻，可以包括：发射节点将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
实施例中，发射节点将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻时，为了进一步提高处理结果的准确度，可以进行如下处理：发射节点将本地加速度传感器采样值进行平滑处理；对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。其中，波谷时间间隔检测结果符合预定条件，可以包括：连续的波谷两两之间的时间间隔在70％的范围内；和/或，波谷幅度检测结果符合预定条件，可以包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
图4为本例中定位发包时刻的一具体实例的流程图。如图4所示，本例中发射节点将加速度信号首先通过一个3阶中值滤波器进行平滑，再利用以下三个条件来确定发包时刻：
1、设置一个滑动窗口存储连续时刻的3个采样值，根据采样值之间大小关系验证是否匹配波谷凹点的形状。
2、当一个波谷形状匹配出来后，再进行时间间隔的检测，即连续的波谷两两之间的时间间隔必须在70％的范围内。
3、当条件1、2满足后，为了排除随机产生的波谷，当前检测的波谷的采样值必须低于所在周期幅度的一半，如图5所示。图5示出了本例中对加速度采样值波谷的幅度读数进行判断的示例。
以上三个条件都满足了之后，最佳的发包时刻就可以确定并且保持跟踪。
第三步需要实施的是利用功率控制调整发射功率。本例中，产生的数据包先存在缓存内等待发送时刻，当每次发包都在最佳时刻，则等效信道的质量会十分稳定，同时进行功率控制，可以使发射功率一直保持在很低的等级上。具体的功率控制过程中，可以采用闭环反馈机制，发射节点先按初始功率等级发包，接收节点收到包后检测接收数据强度，也就是RSSI，如果在预先设定的门限范围内则发射功率不改。高于这个范围的话就减少下次发射功率，低于这个范围就增加发射功率。更新后的功率等级值将放入到反 馈控制包里反馈给发射节点，控制包发送后，发射节点根据收到的功率等级值来调整下个包的发射功率。
例如在一具体的实例中，第一次发射可以采用一个较高的功率，比如0dBm，接收到数据包后计算其RSSI值，如果在门限范围内(-80dBm至-85dBm)，则不用进行任何操作。如高于此门限，接收节点计算出需要减少的值，放在控制包内反馈给发射节点。如低于此门限，接收节点计算出需要增加的值，放在控制包内反馈给发射节点。具体的功率控制例如可以采用RL-TPC功率控制算法，这个算法将接收到的RSSI值按公式1求加权平均：
Figure PCTCN2015099466-appb-000001
其中，w(xi)是每个RSSI的加权系数，xi代表n个序列中的第i个，这里n取10。E[x]就是计算的加权平均值，用来和门限进行比较。
基于同一发明构思，本发明实施例中还提供了一种无线体域网功率控制系统和一种无线体域网中的发射节点，如下面的实施例所述。由于该系统、发射节点解决问题的原理与前述无线体域网功率控制方法相似，因此该系统、发射节点的实施可以参见前述无线体域网功率控制方法的实施，重复之处不再赘述。
图6为本发明实施例中无线体域网功率控制系统的示意图，如图6所示，该系统可以包括发射节点和接收节点，其中：
发射节点用于接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
接收节点用于接收该数据包后检测接收数据强度，根据接收数据强度确定下一次的发射功率等级值，向发射节点反馈携带下一次的发射功率等级值的控制包；
发射节点还用于接收该控制包后，根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻发送下一个数据包。
在一个实施例中，发射节点可以进一步用于：在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
在一个实施例中，发射节点具体可以用于：根据本地加速度传感器采样值，确定信道衰减最小的时刻；将信道衰减最小的时刻确定为发包时刻。
在一个实施例中，发射节点具体可以用于：将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
在一个实施例中，发射节点具体可以用于：
将本地加速度传感器采样值进行平滑处理；
对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；
对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；
对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；
将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。
在一个实施例中，所述波谷时间间隔检测结果符合预定条件，可以包括：连续的波谷两两之间的时间间隔在70％的范围内；
和/或，所述波谷幅度检测结果符合预定条件，可以包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
图7为本发明实施例中无线体域网中的发射节点的示意图，如图7所示，该发射节点可以包括：
接收模块，用于接收控制包；
时刻确定模块，用于根据本地加速度传感器采样值确定发包时刻；
发送模块，用于根据控制包中携带的发射功率等级值调整发射功率等级，在时刻确定模块确定的发包时刻向接收节点发送数据包，其中，接收模块接收的是上一个控制包，发射功率等级是根据上一个控制包中携带的发射功率等级值调整的。
在一个实施例中，发送模块可以进一步用于：
在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
在一个实施例中，发送模块具体可以用于：
根据本地加速度传感器采样值，确定信道衰减最小的时刻；将信道衰减最小的时刻确定为发包时刻。
在一个实施例中，发送模块具体可以用于：
将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
在一个实施例中，发送模块具体可以用于：
将本地加速度传感器采样值进行平滑处理；
对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；
对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；
对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；
将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。
在一个实施例中，所述波谷时间间隔检测结果符合预定条件，可以包括：连续的波谷两两之间的时间间隔在70％的范围内；
和/或，所述波谷幅度检测结果符合预定条件，可以包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
本发明实施例还进行了实验验证。图8说明了当实验对象在行走时，利用人体规则动作和不用人体规则动作这两种情况的功率等级变化曲线，AA-TPC就是本发明实施例的功率控制算法，RL-TPC是现有技术的功率控制算法。可以很明显的看出利用人体规则动作的功率控制算法使得发送功率等级在绝大部分时间内保持在最低的等级，因此通过实例验证了本发明实施例可以极大提高无线体域网功率控制算法的性能。
综上所述，本发明实施例利用人体规则动作，将加速度传感器数据和RSSI数据进行融合，将控制发包时刻和发包功率相结合，降低发射功率。在具体的实施例中，每次数据包发送在信道衰减最小的时刻，这样，即使由于人体大幅度动态变化(比如走，跑)或是发包频率并不是很快(比如1秒一个包)的情况下，仍然可以将一个动态变化的信道转换成一个稳定可靠的信道，从而将发射功率始终保持在一个很低的等级，同时保证了通信质量和能耗有效性，获得了较好的效果。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理 器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述的具体实施例，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (18)

  1. 一种无线体域网功率控制方法，其特征在于，包括：
    发射节点接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
    发射节点接收根据该数据包反馈的控制包，该控制包携带根据该数据包的接收数据强度确定的下一次的发射功率等级值；
    发射节点根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送下一个数据包。
  2. 如权利要求1所述的方法，其特征在于，进一步包括：
    发射节点在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
  3. 如权利要求1所述的方法，其特征在于，发射节点根据本地加速度传感器采样值确定发包时刻，包括：
    发射节点根据本地加速度传感器采样值，确定信道衰减最小的时刻；
    发射节点将信道衰减最小的时刻确定为发包时刻。
  4. 如权利要求3所述的方法，其特征在于，发射节点根据本地加速度传感器采样值，确定信道衰减最小的时刻，包括：
    发射节点将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
  5. 如权利要求4所述的方法，其特征在于，发射节点将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻，包括：
    发射节点将本地加速度传感器采样值进行平滑处理；
    发射节点对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；
    发射节点对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；
    发射节点对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；
    发射节点将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。
  6. 如权利要求5所述的方法，其特征在于，所述波谷时间间隔检测结果符合预定条件，包括：连续的波谷两两之间的时间间隔在70％的范围内；
    和/或，所述波谷幅度检测结果符合预定条件，包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
  7. 一种无线体域网功率控制系统，其特征在于，包括发射节点和接收节点，其中：
    发射节点用于接收上一个控制包后，根据上一个控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻向接收节点发送数据包；
    接收节点用于接收该数据包后检测接收数据强度，根据接收数据强度确定下一次的发射功率等级值，向发射节点反馈携带下一次的发射功率等级值的控制包；
    发射节点还用于接收该控制包后，根据该控制包中携带的发射功率等级值调整发射功率等级，根据本地加速度传感器采样值确定发包时刻，在该发包时刻发送下一个数据包。
  8. 如权利要求7所述的系统，其特征在于，发射节点进一步用于：在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
  9. 如权利要求7所述的系统，其特征在于，发射节点具体用于：根据本地加速度传感器采样值，确定信道衰减最小的时刻；将信道衰减最小的时刻确定为发包时刻。
  10. 如权利要求9所述的系统，其特征在于，发射节点具体用于：将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
  11. 如权利要求10所述的系统，其特征在于，发射节点具体用于：
    将本地加速度传感器采样值进行平滑处理；
    对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；
    对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；
    对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；
    将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。
  12. 如权利要求11所述的系统，其特征在于，所述波谷时间间隔检测结果符合预定条件，包括：连续的波谷两两之间的时间间隔在70％的范围内；
    和/或，所述波谷幅度检测结果符合预定条件，包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
  13. 一种无线体域网中的发射节点，其特征在于，包括：
    接收模块，用于接收控制包；
    时刻确定模块，用于根据本地加速度传感器采样值确定发包时刻；
    发送模块，用于根据控制包中携带的发射功率等级值调整发射功率等级，在时刻确定模块确定的发包时刻向接收节点发送数据包，其中，接收模块接收的是上一个控制包，发射功率等级是根据上一个控制包中携带的发射功率等级值调整的。
  14. 如权利要求13所述的发射节点，其特征在于，发送模块进一步用于：
    在初始发包时刻，按初始发射功率等级向接收节点发送首个数据包。
  15. 如权利要求13所述的发射节点，其特征在于，发送模块具体用于：
    根据本地加速度传感器采样值，确定信道衰减最小的时刻；将信道衰减最小的时刻确定为发包时刻。
  16. 如权利要求15所述的发射节点，其特征在于，发送模块具体用于：
    将本地加速度传感器采样值的每个周期的波谷时刻，确定为信道衰减最小的时刻。
  17. 如权利要求16所述的发射节点，其特征在于，发送模块具体用于：
    将本地加速度传感器采样值进行平滑处理；
    对平滑处理后的本地加速度传感器采样值进行波谷波形匹配；
    对波谷波形匹配成功的本地加速度传感器采样值进行波谷时间间隔检测；
    对波谷时间间隔检测结果符合预定条件的本地加速度传感器采样值，进行波谷幅度检测；
    将波谷幅度检测结果符合预定条件的本地加速度传感器采样值对应的波谷时刻，确定为信道衰减最小的时刻。
  18. 如权利要求16所述的发射节点，其特征在于，所述波谷时间间隔检测结果符合预定条件，包括：连续的波谷两两之间的时间间隔在70％的范围内；
    和/或，所述波谷幅度检测结果符合预定条件，包括：当前检测波谷的幅度采样值低于所在周期幅度的一半。
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CN104219755A (zh) * 2013-05-31 2014-12-17 中兴通讯股份有限公司 一种无线体域网的节点功率控制方法、设备和系统

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CN112378451A (zh) * 2020-11-25 2021-02-19 深圳市特发信息股份有限公司 无线传感器功率跟随自动采集在线监测系统
CN112378451B (zh) * 2020-11-25 2022-09-16 深圳市特发信息股份有限公司 无线传感器功率跟随自动采集在线监测系统
CN116528183A (zh) * 2023-05-22 2023-08-01 南京邮电大学 一种高频段室内信道构建方法、装置、存储介质及计算设备

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