WO2013189449A2 - Open-loop joint power control method and device for wireless body area network - Google Patents
Open-loop joint power control method and device for wireless body area network Download PDFInfo
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- WO2013189449A2 WO2013189449A2 PCT/CN2013/082502 CN2013082502W WO2013189449A2 WO 2013189449 A2 WO2013189449 A2 WO 2013189449A2 CN 2013082502 W CN2013082502 W CN 2013082502W WO 2013189449 A2 WO2013189449 A2 WO 2013189449A2
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000003993 interaction Effects 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 description 8
- 238000011217 control strategy Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006266 hibernation Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 230000007958 sleep Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
Definitions
- the present invention relates to the field of short-range broadband wireless communication, and more particularly to a method and apparatus for open-loop joint power control of a wireless body area network. Background technique
- Wireless Body Area Network is a fusion of micro-sensing technology, bio-medical technology and wireless communication technology. It is the key to the Internet of Things due to its low power consumption, high reliability, and high packet data rate. Technical support can provide ubiquitous medical services and become a focus of attention in the medical, business and academic communities.
- the WBAN system is a short-range communication system and has the following characteristics:
- the WBAN system is currently mainly used for packet data collection or monitoring of local conditions in medical or non-medical fields, with the human body as a channel, especially implanted devices, and variable human tissue parameters. It leads to complex channel conditions, and the human body is sensitive to electromagnetic waves, so it is essential to control the transmission power of the device.
- the device When the device is implanted into the human body, the volume and life of the battery is a prominent problem in system design; The long power control method not only has poor tracking capability, but also causes unnecessary power loss under stable channel conditions.
- the WBAN system is flexible, with a star formed by a hub and nodes on each person.
- the topology structure is a basic unit, and the irregular motion of the topology unit makes the topology of the system flexible and variable, resulting in unstable reception power. Therefore, while considering the performance characteristics of WBAN system reliability, network diversity and mobility, effectively dealing with energy consumption has become one of the main challenges faced by WBAN technology.
- IEEE 802.15.6 defines the energy-saving strategy of the wireless body area network from a macro perspective, and gives two methods of saving power, such as “sleep” and “hibernation”, but the dynamic power control strategy is still blank. Summary of the invention
- the main objective of the embodiments of the present invention is to provide an open-loop joint power control method and apparatus for a wireless body area network to implement at least dynamic power control of a wireless body area network.
- An open-loop joint power control method for a wireless body area network comprising:
- the level of the transmit power of the node itself is carried in the frame data of the interaction
- the local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data.
- the local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data, including:
- the local node obtains the received power of the local node by using a physical layer measurement; the local node calculates, according to the transmit power of the opposite node, and the received power of the local node, that the normal working condition is met, The minimum transmit power level required by the local node;
- the local node carries the determined power level level in frame data sent to the correspondent node, and continues to send data to the correspondent node at the power level level until the power level level change.
- the local node calculates a minimum transmit power level required by the local node in a situation that satisfies normal operating conditions by: Wherein, / ⁇ represents the minimum transmit power level, indicating the transmit power of the correspondent node, indicating that the local node can correctly detect and decode the power threshold of the signal, / ⁇ indicates the received power of the local node, C Indicates the pre-adjustment factor.
- An open loop joint power control device for a wireless body area network comprising:
- An interaction module configured to carry a level level of the node's own transmit power in the interacting frame data when performing interaction between the nodes
- the power control module is configured to perform local node transmit power control according to a level level of the transmit power of the opposite node carried in the received frame data.
- the power control module includes:
- a peer transmit power determining submodule configured to determine a transmit power of the peer node according to a level level of transmit power of the peer node carried in the frame data from the peer node;
- Receiving a power measurement submodule configured to obtain a received power of the local node by using a physical layer measurement
- a minimum transmit power calculation sub-module configured to calculate, according to the transmit power of the correspondent node and the received power of the local node, a minimum transmit power level required by the local node when the normal working condition is met;
- a level level determining submodule configured to determine a power level level corresponding to the minimum transmit power level according to a preset power level level
- a power control submodule configured to notify the interaction module to carry the determined power level level in frame data sent to the correspondent node, and continue to send data to the correspondent node at the power level level Until the power level level changes.
- the minimum transmit power calculation sub-module calculates a minimum transmit power level required by the local node in a situation that satisfies normal operating conditions by:
- / represents the minimum transmit power level, indicating the transmit power of the opposite node Rate, indicating that the local node can correctly detect and decode the power threshold of the signal
- / ⁇ indicates the received power of the local node
- C indicates the pre-adjustment coefficient
- An open-loop joint power control method and device for a wireless body area network implements dynamic power control of a wireless body area network, and fills in a blank of a dynamic power control strategy in a wireless body area network standard;
- the open-loop joint power control method is simple, requires little system overhead, and is suitable for a short-range communication system with high energy-saving requirements such as a wireless body area network.
- FIG. 1 is a schematic flowchart 1 of a method for open-loop joint power control of a wireless body area network according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart 2 of an open loop joint power control method for a wireless body area network according to an embodiment of the present disclosure
- FIG. 3 is a schematic structural diagram of a structure of an open loop joint power control apparatus for a wireless body area network according to an embodiment of the present invention. detailed description
- An open loop joint power control method for a wireless body area network mainly includes:
- Step 101 When the nodes interact with each other, the level data of the node's own transmit power is carried in the frame data of the interaction.
- Presetting a power level level and a corresponding transmit power level on each node Presetting a power level level and a corresponding transmit power level on each node.
- the node When a node sends frame data, the node carries information of a level level corresponding to the transmit power in the transmitted frame data to notify the frame.
- the receiver of the data is the transmit power of the node when transmitting the frame data.
- Step 102 The local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data. Specifically include:
- the local node obtains the received power of the local node by using a physical layer measurement; the local node calculates, according to the transmit power of the opposite node, and the received power of the local node, that the normal working condition is met, The minimum transmit power level required by the local node;
- the local node carries the determined power level level in frame data sent to the correspondent node, and continues to send data to the correspondent node at the power level level until the power level level change.
- the local node calculates, by using the following manner, a minimum transmit power level required by the local node when the normal working condition is met:
- / ⁇ denotes the minimum transmit power level, indicating the transmit power of the correspondent node, indicating that the local node can correctly detect and decode the power threshold of the signal, / ⁇ indicates the local node Receive power, C represents the pre-adjustment factor, C can be determined experimentally.
- the basic idea of the open loop joint power control in the embodiment of the present invention is: when the channel condition is deteriorated, the transmit power of the node is improved within the safe range to ensure that the radiated power is satisfied, so as to ensure that the data packet is correctly received; When the channel condition satisfies the transmission reliability, the transmit power of the node can be appropriately reduced to save energy, extend the working life of the node, and prolong the survival time of the network. Therefore, embodiments of the present invention propose a joint power control strategy for a medium access control (MAC) / physical (PHY) layer.
- MAC medium access control
- PHY physical
- Open loop joint power control is based on the measurement results to estimate the path loss and interference level. Thereby the transmission power is calculated.
- Open-loop joint power control is a hypothesis that downlink loss and uplink loss are similar. According to this assumption, the local node estimates the path loss of the signal sent from the opposite node according to the total received power, and then estimates the local node to follow. The transmit power at the time of transmission.
- the open loop power control method is simple and requires little system overhead, and is suitable for a short-range communication system with high energy-saving requirements such as a wireless body area network.
- the node 1 when the node 1 knows the transmission power P t of the node and the power threshold / which can detect and decode the signal correctly, and can measure the power p r of the received signal, the node 1 can calculate according to the following formula.
- c is the pre-adjustment factor and c can be determined experimentally.
- the choice of transmit power level affects many aspects of the network and requires physical layer support.
- the node 1 After receiving the frame data of the node 2, the node 1 can obtain the received power by the measurement of the physical layer, and the frame data sent by the node 2 carries the level level of the transmit power of the node 2, so that the node 1 can determine The minimum transmit power level required.
- the received signal strength can be known and the power level level can be obtained.
- the physical layer is capable of transmitting frame data at the discrete power level level, while the physical layer is capable of informing the MAC layer of the received frame data power.
- the process of calculating the minimum transmit power required by node 1 is performed at the MAC layer, and the power control of the node is achieved through the cooperation of the physical layer and the MAC layer.
- Step 201 The node 2 carries level information of its transmit power in the frame data sent to the node 1.
- the level level can directly convert the actual transmit power.
- Step 202 At the physical layer, the node 1 obtains the received power by measurement according to the transmission model.
- Step 203 At the MAC layer, the node 1 calculates the minimum transmit power level required by the node 1 under the condition that the normal working condition is satisfied according to the above formula.
- Step 204 Determine, according to the preset M power level levels, the power level level corresponding to the minimum transmit power level.
- Step 205 The frame data sent by the node 1 to the node 2 carries a power level level.
- step 206 node 1 continues to transmit data at this level of power until the power level level changes.
- node 2 or node 1 can pass.
- the power level level information carried by the interacting frame is power controlled to increase or decrease the currently used power level.
- An embodiment of the present invention further provides an open-loop joint power control apparatus for a wireless body area network, as shown in FIG. 3, including:
- the interaction module 10 is configured to carry a level level of the node's own transmit power in the interacting frame data when performing interaction between the nodes;
- the power control module 20 is configured to perform local node transmit power control according to a level level of the transmit power of the opposite node carried in the received frame data.
- the power control module 20 includes:
- the peer transmit power determining sub-module 210 is configured to determine a transmit power of the correspondent node according to a level level of transmit power of the correspondent node carried in the frame data from the correspondent node;
- the receiving power measurement sub-module 220 is configured to obtain the received power of the local node by using physical layer measurement
- the minimum transmit power calculation sub-module 230 is configured to calculate, according to the transmit power of the correspondent node and the received power of the local node, a minimum transmit power level required by the local node when the normal working condition is met. ;
- the level level determining sub-module 240 is configured to determine a power level level corresponding to the minimum transmit power level according to a preset power level level;
- the power control sub-module 250 is configured to notify the interaction module 10 to carry the determined power level level in the frame data sent to the correspondent node, and continue to the peer node at the power level level. Data is sent until the power level level changes.
- the minimum transmit power calculation sub-module 230 calculates the minimum transmit power level required by the local node in the case of satisfying normal operating conditions by: ⁇ , where / represents the minimum transmit power level, P f denotes the transmit power of the opposite end node, indicating that the local node can correctly detect and decode the power threshold of the signal, / ⁇ denotes the received power of the local node, and c denotes a pre-adjustment coefficient.
- interaction module of the embodiment of the present invention may be implemented by an interactive function chip, and the power control module and its submodules may be implemented by a central processing unit (CPU) or a digital signal processing (DSP) chip.
- CPU central processing unit
- DSP digital signal processing
- the embodiment of the present invention implements dynamic power control of the wireless body area network, and fills in the blank of the dynamic power control strategy in the wireless body area network standard; the open loop joint power control method is simple, and the system overhead requirement is small. Suitable for wireless body area networks, such as short-distance communication systems with high energy-saving requirements.
- An open-loop joint power control method and apparatus for a wireless body area network when interacting between nodes, carrying the level level of the node's own transmit power in the interacting frame data; The control of the self-transmitted power is performed according to the level level of the transmit power of the opposite node carried in the received frame data.
- the dynamic power control of the wireless body area network is realized, and the blank of the dynamic power control strategy in the wireless body area network standard is filled; the open loop joint power control method is simple, and the system overhead requirement is small, and is suitable for the wireless body area network.
Abstract
Disclosed is an open-loop joint power control method for a wireless body area network, including: in the case of interaction among nodes, carrying the electrical level grades of their own transmission powers of the nodes in frame data which perform interaction; and according to the electrical level grade of the transmission power of an opposite end node carried in the received frame data, a local node controlling its own transmission power. Also disclosed is an open-loop joint power control device for a wireless body area network. The present invention can realize dynamic power control on a wireless body area network.
Description
一种无线体域网的开环联合功率控制方法和装置 技术领域 Open-loop joint power control method and device for wireless body area network
本发明涉及短距离宽带无线通信领域， 特别是指一种无线体域网的开 环联合功率控制方法和装置。 背景技术 The present invention relates to the field of short-range broadband wireless communication, and more particularly to a method and apparatus for open-loop joint power control of a wireless body area network. Background technique
无线体域网（ WBAN, Wireless Body Area Network )技术是微传感技术、 生物医学技术和无线通信技术的融合， 由于其低功耗、 高可靠性、 高分组 数据速率等特点成为物联网的关键技术支撑， 可以提供无处不在的医疗服 务， 成为医疗界、 商业界和学术界广泛关注的焦点。 Wireless Body Area Network (WBAN) technology is a fusion of micro-sensing technology, bio-medical technology and wireless communication technology. It is the key to the Internet of Things due to its low power consumption, high reliability, and high packet data rate. Technical support can provide ubiquitous medical services and become a focus of attention in the medical, business and academic communities.
WBAN系统属于短距离通信系统， 有以下特点： WBAN系统目前主要 应用于医疗或非医疗领域中局部状况的分组数据采集或监测， 以人体为信 道， 尤其是植入设备， 多变的人体组织参数导致了复杂的信道状况， 而人 体对电磁波的反应很敏感， 所以对设备发送功率的控制必不可少； 当设备 植入人体， 电池的体积和寿命问题是系统设计的突出难题； 而传统固定步 长功率控制方法不仅跟踪能力差， 而且还会造成稳定信道状况下不必要的 功率损耗； WBAN系统组网灵活， 以每个人身上的一个集线器（hub )和若 干个节点 （node )形成的星形拓朴结构为基本单元， 该拓朴单元无规律的 运动使系统的拓朴结构灵活多变，导致接收功率不稳定。因此，考虑 WBAN 系统的可靠性、 网络多样性和移动性等性能特征的同时， 有效处理能量消 耗问题已成为 WBAN技术面临的主要挑战之一。 The WBAN system is a short-range communication system and has the following characteristics: The WBAN system is currently mainly used for packet data collection or monitoring of local conditions in medical or non-medical fields, with the human body as a channel, especially implanted devices, and variable human tissue parameters. It leads to complex channel conditions, and the human body is sensitive to electromagnetic waves, so it is essential to control the transmission power of the device. When the device is implanted into the human body, the volume and life of the battery is a prominent problem in system design; The long power control method not only has poor tracking capability, but also causes unnecessary power loss under stable channel conditions. The WBAN system is flexible, with a star formed by a hub and nodes on each person. The topology structure is a basic unit, and the irregular motion of the topology unit makes the topology of the system flexible and variable, resulting in unstable reception power. Therefore, while considering the performance characteristics of WBAN system reliability, network diversity and mobility, effectively dealing with energy consumption has become one of the main challenges faced by WBAN technology.
IEEE 802.15.6从宏观角度定义了无线体域网的节能策略， 给出了 "休 眠" 和 "冬眠" 两种节约功耗的方法， 但是动态的功率控制策略仍是空白。
发明内容 IEEE 802.15.6 defines the energy-saving strategy of the wireless body area network from a macro perspective, and gives two methods of saving power, such as "sleep" and "hibernation", but the dynamic power control strategy is still blank. Summary of the invention
有鉴于此， 本发明实施例的主要目的在于提供一种无线体域网的开环 联合功率控制方法和装置， 以至少实现无线体域网的动态的功率控制。 In view of this, the main objective of the embodiments of the present invention is to provide an open-loop joint power control method and apparatus for a wireless body area network to implement at least dynamic power control of a wireless body area network.
为达到上述目的， 本发明实施例的技术方案是这样实现的： To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:
一种无线体域网的开环联合功率控制方法， 该方法包括： An open-loop joint power control method for a wireless body area network, the method comprising:
节点之间交互时， 在进行交互的帧数据中携带所述节点自身发射功率 的电平等级； When the nodes interact with each other, the level of the transmit power of the node itself is carried in the frame data of the interaction;
本地节点根据接收的帧数据中携带的对端节点发射功率的电平等级， 进行自身发射功率的控制。 The local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data.
较佳地， 所述本地节点根据接收的帧数据中携带的对端节点发射功率 的电平等级， 进行自身发射功率的控制， 包括： Preferably, the local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data, including:
所述本地节点根据来自对端节点的帧数据中携带的对端节点发射功率 的电平等级， 确定所述对端节点的发射功率； Determining, by the local node, a transmit power of the peer node according to a level level of a transmit power of the peer node carried in the frame data from the peer node;
所述本地节点通过物理层的测量得到所述本地节点的接收功率； 所述本地节点根据所述对端节点的发射功率、 以及所述本地节点的接 收功率， 计算得到满足正常工作条件情况下， 所述本地节点所需的最小发 射功率电平； The local node obtains the received power of the local node by using a physical layer measurement; the local node calculates, according to the transmit power of the opposite node, and the received power of the local node, that the normal working condition is met, The minimum transmit power level required by the local node;
所述本地节点根据预设的功率电平等级， 确定所述最小发射功率电平 对应的功率电平等级； Determining, by the local node, a power level level corresponding to the minimum transmit power level according to a preset power level level;
所述本地节点在向所述对端节点发送的帧数据中携带所确定的功率电 平等级， 并以所述功率电平等级继续向所述对端节点发送数据， 直至所述 功率电平等级改变。 The local node carries the determined power level level in frame data sent to the correspondent node, and continues to send data to the correspondent node at the power level level until the power level level change.
较佳地， 所述本地节点通过以下方式计算得到满足正常工作条件情况 下， 所述本地节点所需的最小发射功率电平：
其中， /^表示所述最小发射功率电平， 表示所述对端节点的发射功 率， 表示所述本地节点能正确检测并解码信号的功率门限， /^表示所述 本地节点的接收功率， C表示预调整系数。 Preferably, the local node calculates a minimum transmit power level required by the local node in a situation that satisfies normal operating conditions by: Wherein, /^ represents the minimum transmit power level, indicating the transmit power of the correspondent node, indicating that the local node can correctly detect and decode the power threshold of the signal, /^ indicates the received power of the local node, C Indicates the pre-adjustment factor.
一种无线体域网的开环联合功率控制装置， 包括： An open loop joint power control device for a wireless body area network, comprising:
交互模块， 配置为在进行节点之间交互时， 在进行交互的帧数据中携 带所述节点自身发射功率的电平等级； An interaction module, configured to carry a level level of the node's own transmit power in the interacting frame data when performing interaction between the nodes;
功率控制模块， 配置为根据接收的帧数据中携带的对端节点发射功率 的电平等级， 进行本地节点发射功率的控制。 The power control module is configured to perform local node transmit power control according to a level level of the transmit power of the opposite node carried in the received frame data.
较佳地， 所述功率控制模块包括： Preferably, the power control module includes:
对端发射功率确定子模块， 配置为根据来自对端节点的帧数据中携带 的对端节点发射功率的电平等级， 确定所述对端节点的发射功率； a peer transmit power determining submodule configured to determine a transmit power of the peer node according to a level level of transmit power of the peer node carried in the frame data from the peer node;
接收功率测量子模块， 配置为通过物理层的测量得到所述本地节点的 接收功率； Receiving a power measurement submodule, configured to obtain a received power of the local node by using a physical layer measurement;
最小发射功率计算子模块， 配置为根据所述对端节点的发射功率、 以 及所述本地节点的接收功率， 计算得到满足正常工作条件情况下， 所述本 地节点所需的最小发射功率电平； a minimum transmit power calculation sub-module configured to calculate, according to the transmit power of the correspondent node and the received power of the local node, a minimum transmit power level required by the local node when the normal working condition is met;
电平等级确定子模块， 配置为根据预设的功率电平等级， 确定所述最 小发射功率电平对应的功率电平等级； a level level determining submodule configured to determine a power level level corresponding to the minimum transmit power level according to a preset power level level;
功率控制子模块， 配置为通知所述交互模块在向所述对端节点发送的 帧数据中携带所确定的功率电平等级， 并以所述功率电平等级继续向所述 对端节点发送数据， 直至所述功率电平等级改变。 a power control submodule configured to notify the interaction module to carry the determined power level level in frame data sent to the correspondent node, and continue to send data to the correspondent node at the power level level Until the power level level changes.
较佳地， 所述最小发射功率计算子模块通过以下方式计算得到满足正 常工作条件情况下， 所述本地节点所需的最小发射功率电平：
Preferably, the minimum transmit power calculation sub-module calculates a minimum transmit power level required by the local node in a situation that satisfies normal operating conditions by:
其中， / 表示所述最小发射功率电平， 表示所述对端节点的发射功
率， 表示所述本地节点能正确检测并解码信号的功率门限， /^表示所述 本地节点的接收功率， C表示预调整系数。 Wherein / represents the minimum transmit power level, indicating the transmit power of the opposite node Rate, indicating that the local node can correctly detect and decode the power threshold of the signal, /^ indicates the received power of the local node, and C indicates the pre-adjustment coefficient.
本发明实施例提出的一种无线体域网的开环联合功率控制方法和装 置， 实现了无线体域网的动态的功率控制， 填补了无线体域网标准中的动 态功率控制策略的空白； 开环联合功率控制方法简单， 对系统开销要求小， 适合于无线体域网这种节能要求高的短距离通信系统。 附图说明 An open-loop joint power control method and device for a wireless body area network according to an embodiment of the present invention implements dynamic power control of a wireless body area network, and fills in a blank of a dynamic power control strategy in a wireless body area network standard; The open-loop joint power control method is simple, requires little system overhead, and is suitable for a short-range communication system with high energy-saving requirements such as a wireless body area network. DRAWINGS
图 1 为本发明实施例提供的一种无线体域网的开环联合功率控制方法 的流程示意图一； 1 is a schematic flowchart 1 of a method for open-loop joint power control of a wireless body area network according to an embodiment of the present invention;
图 为本发明实施例提供的一种无线体域网的开环联合功率控制方法 的流程示意图二； FIG. 2 is a schematic flowchart 2 of an open loop joint power control method for a wireless body area network according to an embodiment of the present disclosure;
图 3 为本发明实施例提供的一种无线体域网的开环联合功率控制装置 的组成结构示意图。 具体实施方式 FIG. 3 is a schematic structural diagram of a structure of an open loop joint power control apparatus for a wireless body area network according to an embodiment of the present invention. detailed description
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明实施例提供的一种无线体域网的开环联合功率控制方法，如图 1 所示， 主要包括： The technical solutions of the present invention are further elaborated below in conjunction with the accompanying drawings and specific embodiments. An open loop joint power control method for a wireless body area network according to an embodiment of the present invention, as shown in FIG. 1 , mainly includes:
步驟 101 , 节点之间交互时， 在进行交互的帧数据中携带所述节点自身 发射功率的电平等级。 Step 101: When the nodes interact with each other, the level data of the node's own transmit power is carried in the frame data of the interaction.
在每个节点上预设功率电平等级及对应的发射功率电平， 当某节点发 送帧数据时， 所述节点在发送的帧数据中携带发射功率对应的电平等级的 信息， 以告知帧数据的接收方所述节点在发送所述帧数据时的发射功率。 Presetting a power level level and a corresponding transmit power level on each node. When a node sends frame data, the node carries information of a level level corresponding to the transmit power in the transmitted frame data to notify the frame. The receiver of the data is the transmit power of the node when transmitting the frame data.
步驟 102,本地节点根据接收的帧数据中携带的对端节点发射功率的电 平等级， 进行自身发射功率的控制。
具体包括： Step 102: The local node performs control of its own transmit power according to the level level of the transmit power of the peer node carried in the received frame data. Specifically include:
本地节点根据来自对端节点的帧数据中携带的对端节点发射功率的电 平等级， 确定所述对端节点的发射功率； Determining, by the local node, a transmit power of the peer node according to a level of a transmit power of the peer node carried in the frame data of the peer node;
所述本地节点通过物理层的测量得到所述本地节点的接收功率； 所述本地节点根据所述对端节点的发射功率、 以及所述本地节点的接 收功率， 计算得到满足正常工作条件情况下， 所述本地节点所需的最小发 射功率电平； The local node obtains the received power of the local node by using a physical layer measurement; the local node calculates, according to the transmit power of the opposite node, and the received power of the local node, that the normal working condition is met, The minimum transmit power level required by the local node;
所述本地节点根据预设的功率电平等级， 确定所述最小发射功率电平 对应的功率电平等级； Determining, by the local node, a power level level corresponding to the minimum transmit power level according to a preset power level level;
所述本地节点在向所述对端节点发送的帧数据中携带所确定的功率电 平等级， 并以所述功率电平等级继续向所述对端节点发送数据， 直至所述 功率电平等级改变。 The local node carries the determined power level level in frame data sent to the correspondent node, and continues to send data to the correspondent node at the power level level until the power level level change.
其中， 所述本地节点通过以下方式计算得到满足正常工作条件情况下， 所述本地节点所需的最小发射功率电平： The local node calculates, by using the following manner, a minimum transmit power level required by the local node when the normal working condition is met:
1 mm p ^ 其中， /^表示所述最小发射功率电平， 表示所述对端节点的发射功 率， 表示所述本地节点能正确检测并解码信号的功率门限， /^表示所述 本地节点的接收功率， C表示预调整系数， C可通过实验方式确定。 1 mm p ^ where /^ denotes the minimum transmit power level, indicating the transmit power of the correspondent node, indicating that the local node can correctly detect and decode the power threshold of the signal, /^ indicates the local node Receive power, C represents the pre-adjustment factor, C can be determined experimentally.
需要说明的是， 本发明实施例的开环联合功率控制的基本思想是： 在 信道条件恶化时， 在保证满足辐射功率在安全范围内提高节点的发射功率， 以保证数据分组被正确接收； 在信道条件满足传输可靠性时， 可以适当减 小节点的发射功率以节省能量， 延长节点的工作寿命， 进而延长网络的生 存时间。 因此， 本发明实施例提出媒体接入控制 （MAC ) /物理（PHY )层 的联合功率控制策略。 It should be noted that the basic idea of the open loop joint power control in the embodiment of the present invention is: when the channel condition is deteriorated, the transmit power of the node is improved within the safe range to ensure that the radiated power is satisfied, so as to ensure that the data packet is correctly received; When the channel condition satisfies the transmission reliability, the transmit power of the node can be appropriately reduced to save energy, extend the working life of the node, and prolong the survival time of the network. Therefore, embodiments of the present invention propose a joint power control strategy for a medium access control (MAC) / physical (PHY) layer.
开环联合功率控制是根据测量结果对路径损耗和干扰水平进行估计，
从而计算发射功率。 开环联合功率控制是下行链路损耗和上行链路损耗相 近的假设， 根据这个假设， 本地节点根据接收到的总功率估计从对端节点 发来的信号的路径损耗， 然后再估计本地节点后续进行发射时的发射功率。 开环功控方法简单， 对系统开销要求小， 适合于无线体域网这种节能要求 高的短距离通信系统。 Open loop joint power control is based on the measurement results to estimate the path loss and interference level. Thereby the transmission power is calculated. Open-loop joint power control is a hypothesis that downlink loss and uplink loss are similar. According to this assumption, the local node estimates the path loss of the signal sent from the opposite node according to the total received power, and then estimates the local node to follow. The transmit power at the time of transmission. The open loop power control method is simple and requires little system overhead, and is suitable for a short-range communication system with high energy-saving requirements such as a wireless body area network.
在采用功率控制技术时，当节点 1知道节点 的发送功率 Pt以及自身能 够正确检测并解码信号的功率门限/ , 并且能够测出接收信号的功率 pr时， 节点 1就能够根据下式计算出发送节点所需的最小发射功率电平：
When the power control technique is adopted, when the node 1 knows the transmission power P t of the node and the power threshold / which can detect and decode the signal correctly, and can measure the power p r of the received signal, the node 1 can calculate according to the following formula. The minimum transmit power level required to send out the node:
其中， c表示预调整系数， c可通过实验方式确定。 Where c is the pre-adjustment factor and c can be determined experimentally.
发送功率电平的选择会影响到网络的很多方面， 需要物理层的支持。 节点 1收到节点 2的帧数据后， 通过物理层的测量可以得到接收功率的大 小， 而在节点 2发送的帧数据中携带有节点 2的发射功率的电平等级， 这 样节点 1便能确定所需的最小发射功率电平。 在接收到信号后， 可以知道 接收信号强度， 并能得到功率电平级别。 在确定好发送帧数据所需的最小 功率电平后， 物理层要能够以该离散的功率电平级别发送帧数据， 同时， 物理层要能够告知 MAC层接收到的帧数据的功率。节点 1计算所需的最小 发射功率的过程在 MAC层进行， 通过物理层和 MAC层的配合达到对节点 进行功率控制的目的。 The choice of transmit power level affects many aspects of the network and requires physical layer support. After receiving the frame data of the node 2, the node 1 can obtain the received power by the measurement of the physical layer, and the frame data sent by the node 2 carries the level level of the transmit power of the node 2, so that the node 1 can determine The minimum transmit power level required. After receiving the signal, the received signal strength can be known and the power level level can be obtained. After determining the minimum power level required to transmit the frame data, the physical layer is capable of transmitting frame data at the discrete power level level, while the physical layer is capable of informing the MAC layer of the received frame data power. The process of calculating the minimum transmit power required by node 1 is performed at the MAC layer, and the power control of the node is achieved through the cooperation of the physical layer and the MAC layer.
具体实施步驟如图 2所示， 主要包括： The specific implementation steps are shown in Figure 2, including:
步驟 201 ,节点 2在向节点 1发送的帧数据中携带其发射功率的电平等 级信息。 电平等级可以直接换算出实际的发射功率。 Step 201: The node 2 carries level information of its transmit power in the frame data sent to the node 1. The level level can directly convert the actual transmit power.
步驟 202, 在物理层， 节点 1根据传输模型通过测量得到接收功率。 步驟 203 , 在 MAC层， 节点 1根据上述公式计算得到满足正常工作条 件情况下， 节点 1所需的最小发射功率电平。
步驟 204, 根据预设的 M个功率电平等级， 节点 1判断最小发射功率 电平对应的功率电平等级。 Step 202: At the physical layer, the node 1 obtains the received power by measurement according to the transmission model. Step 203: At the MAC layer, the node 1 calculates the minimum transmit power level required by the node 1 under the condition that the normal working condition is satisfied according to the above formula. Step 204: Determine, according to the preset M power level levels, the power level level corresponding to the minimum transmit power level.
步驟 205 , 节点 1向节点 2发送的帧数据中携带有功率电平等级。 Step 205: The frame data sent by the node 1 to the node 2 carries a power level level.
步驟 206, 节点 1以此等级的功率继续发送数据， 直至功率电平等级改 变。 In step 206, node 1 continues to transmit data at this level of power until the power level level changes.
在节点 2和节点 1进行业务交互的过程中， 不管是在竟争期还是非竟 争期， 当需要进行功率控制 （信道通信质量变好或者变差） 时， 节点 2或 节点 1都可以通过正在进行交互的帧携带的功率电平等级信息进行功率控 制， 从而提高或降低当前使用的功率电平。 In the process of service interaction between node 2 and node 1, whether in the competition period or non-contest period, when power control is required (the channel communication quality becomes better or worse), node 2 or node 1 can pass. The power level level information carried by the interacting frame is power controlled to increase or decrease the currently used power level.
本发明实施例还提供一种无线体域网的开环联合功率控制装置，如图 3 所示， 包括： An embodiment of the present invention further provides an open-loop joint power control apparatus for a wireless body area network, as shown in FIG. 3, including:
交互模块 10, 配置为在进行节点之间交互时， 在进行交互的帧数据中 携带所述节点自身发射功率的电平等级； The interaction module 10 is configured to carry a level level of the node's own transmit power in the interacting frame data when performing interaction between the nodes;
功率控制模块 20, 配置为根据接收的帧数据中携带的对端节点发射功 率的电平等级， 进行本地节点发射功率的控制。 The power control module 20 is configured to perform local node transmit power control according to a level level of the transmit power of the opposite node carried in the received frame data.
优选的， 功率控制模块 20包括： Preferably, the power control module 20 includes:
对端发射功率确定子模块 210,配置为根据来自对端节点的帧数据中携 带的对端节点发射功率的电平等级， 确定所述对端节点的发射功率； The peer transmit power determining sub-module 210 is configured to determine a transmit power of the correspondent node according to a level level of transmit power of the correspondent node carried in the frame data from the correspondent node;
接收功率测量子模块 220,配置为通过物理层的测量得到所述本地节点 的接收功率； The receiving power measurement sub-module 220 is configured to obtain the received power of the local node by using physical layer measurement;
最小发射功率计算子模块 230, 配置为根据所述对端节点的发射功率、 以及所述本地节点的接收功率， 计算得到满足正常工作条件情况下， 所述 本地节点所需的最小发射功率电平； The minimum transmit power calculation sub-module 230 is configured to calculate, according to the transmit power of the correspondent node and the received power of the local node, a minimum transmit power level required by the local node when the normal working condition is met. ;
电平等级确定子模块 240, 配置为根据预设的功率电平等级， 确定所述 最小发射功率电平对应的功率电平等级；
功率控制子模块 250, 配置为通知所述交互模块 10在向所述对端节点 发送的帧数据中携带所确定的功率电平等级， 并以所述功率电平等级继续 向所述对端节点发送数据， 直至所述功率电平等级改变。 The level level determining sub-module 240 is configured to determine a power level level corresponding to the minimum transmit power level according to a preset power level level; The power control sub-module 250 is configured to notify the interaction module 10 to carry the determined power level level in the frame data sent to the correspondent node, and continue to the peer node at the power level level. Data is sent until the power level level changes.
优选的， 最小发射功率计算子模块 230通过以下方式计算得到满足正 常工作条件情况下， 所述本地节点所需的最小发射功率电平： ρ^ , 其中， / 表示所述最小发射功率电平， Pf表示所述对端节点的发射功 率， 表示所述本地节点能正确检测并解码信号的功率门限， /^表示所述 本地节点的接收功率， c表示预调整系数。 Preferably, the minimum transmit power calculation sub-module 230 calculates the minimum transmit power level required by the local node in the case of satisfying normal operating conditions by: ρ^ , where / represents the minimum transmit power level, P f denotes the transmit power of the opposite end node, indicating that the local node can correctly detect and decode the power threshold of the signal, /^ denotes the received power of the local node, and c denotes a pre-adjustment coefficient.
需要说明的是， 实际应用中本发明实施例的交互模块可以由交互功能 芯片来实现， 功率控制模块及其子模块可以由中央处理器 （CPU )或数字 信号处理（DSP ) 芯片来实现。 It should be noted that the interaction module of the embodiment of the present invention may be implemented by an interactive function chip, and the power control module and its submodules may be implemented by a central processing unit (CPU) or a digital signal processing (DSP) chip.
综上所述， 本发明实施例实现了无线体域网的动态的功率控制， 填补 了无线体域网标准中的动态功率控制策略的空白； 开环联合功率控制方法 简单， 对系统开销要求小， 适合于无线体域网这种节能要求高的短距离通 信系统。 In summary, the embodiment of the present invention implements dynamic power control of the wireless body area network, and fills in the blank of the dynamic power control strategy in the wireless body area network standard; the open loop joint power control method is simple, and the system overhead requirement is small. Suitable for wireless body area networks, such as short-distance communication systems with high energy-saving requirements.
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。 工业实用性 The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Industrial applicability
本发明实施例提供的一种无线体域网的开环联合功率控制方法和装 置， 在节点之间交互时， 在进行交互的帧数据中携带所述节点自身发射 功率的电平等级； 本地节点根据接收的帧数据中携带的对端节点发射功 率的电平等级， 进行自身发射功率的控制。 如此， 实现了无线体域网的 动态的功率控制， 填补了无线体域网标准中的动态功率控制策略的空白； 开环联合功率控制方法简单， 对系统开销要求小， 适合于无线体域网这
种节能要求高的短距离通信系统 (
An open-loop joint power control method and apparatus for a wireless body area network according to an embodiment of the present invention, when interacting between nodes, carrying the level level of the node's own transmit power in the interacting frame data; The control of the self-transmitted power is performed according to the level level of the transmit power of the opposite node carried in the received frame data. In this way, the dynamic power control of the wireless body area network is realized, and the blank of the dynamic power control strategy in the wireless body area network standard is filled; the open loop joint power control method is simple, and the system overhead requirement is small, and is suitable for the wireless body area network. This Short-distance communication system with high energy saving requirements (
Claims
1、 一种无线体域网的开环联合功率控制方法， 该方法包括： 节点之间交互时， 在进行交互的帧数据中携带所述节点自身发射功 率的电平等级； 1. An open-loop joint power control method for a wireless body area network, the method includes: when interacting between nodes, carrying the level of the node's own transmit power in the frame data for interaction;
本地节点根据接收的帧数据中携带的对端节点发射功率的电平等 级， 进行自身发射功率的控制。 The local node controls its own transmit power based on the transmit power level of the peer node carried in the received frame data.
2、根据权利要求 1所述无线体域网的开环联合功率控制方法，其中， 所述本地节点根据接收的帧数据中携带的对端节点发射功率的电平等 级， 进行自身发射功率的控制， 包括： 2. The open-loop joint power control method of the wireless body area network according to claim 1, wherein the local node controls its own transmission power according to the level of the transmission power of the counterpart node carried in the received frame data. , include:
所述本地节点根据来自对端节点的帧数据中携带的对端节点发射功 率的电平等级， 确定所述对端节点的发射功率； The local node determines the transmit power of the counterpart node based on the level of the transmit power of the counterpart node carried in the frame data from the counterpart node;
所述本地节点通过物理层的测量得到所述本地节点的接收功率； 所述本地节点根据所述对端节点的发射功率、 以及所述本地节点的 接收功率， 计算得到满足正常工作条件情况下， 所述本地节点所需的最 小发射功率电平； The local node obtains the received power of the local node through physical layer measurement; the local node calculates based on the transmit power of the counterpart node and the received power of the local node that satisfies normal working conditions, the minimum transmit power level required by the local node;
所述本地节点根据预设的功率电平等级， 确定所述最小发射功率电 平对应的功率电平等级； The local node determines the power level corresponding to the minimum transmit power level according to the preset power level;
所述本地节点在向所述对端节点发送的帧数据中携带所确定的功率 电平等级， 并以所述功率电平等级继续向所述对端节点发送数据， 直至 所述功率电平等级改变。 The local node carries the determined power level in the frame data sent to the opposite node, and continues to send data to the opposite node at the power level until the power level is reached. Change.
3、根据权利要求 2所述无线体域网的开环联合功率控制方法，其中， 所述本地节点通过以下方式计算得到满足正常工作条件情况下， 所述本 地节点所需的最小发射功率电平：
其中， /^表示所述最小发射功率电平， 表示所述对端节点的发射 功率， 表示所述本地节点能正确检测并解码信号的功率门限， 表示 所述本地节点的接收功率， C表示预调整系数。 3. The open-loop joint power control method of the wireless body area network according to claim 2, wherein the local node calculates in the following manner the minimum transmit power level required by the local node when normal operating conditions are met. : Where, /^ represents the minimum transmit power level, represents the transmit power of the opposite node, represents the power threshold at which the local node can correctly detect and decode signals, represents the received power of the local node, and C represents the predetermined Adjustment coefficient.
4、 一种无线体域网的开环联合功率控制装置， 包括： 4. An open-loop joint power control device for wireless body area network, including:
交互模块， 配置为在进行节点之间交互时， 在进行交互的帧数据中 携带所述节点自身发射功率的电平等级； The interaction module is configured to carry the level of the node's own transmission power in the frame data for interaction when interacting between nodes;
功率控制模块， 配置为根据接收的帧数据中携带的对端节点发射功 率的电平等级， 进行本地节点发射功率的控制。 The power control module is configured to control the transmission power of the local node according to the level of the transmission power of the opposite end node carried in the received frame data.
5、根据权利要求 4所述无线体域网的开环联合功率控制装置，其中， 所述功率控制模块包括： 5. The open-loop joint power control device of the wireless body area network according to claim 4, wherein the power control module includes:
对端发射功率确定子模块， 配置为根据来自对端节点的帧数据中携 带的对端节点发射功率的电平等级， 确定所述对端节点的发射功率； 接收功率测量子模块， 配置为通过物理层的测量得到所述本地节点 的接收功率； The peer transmit power determination submodule is configured to determine the transmit power of the peer node based on the level of the peer node transmit power carried in the frame data from the peer node; the receive power measurement submodule is configured to pass Physical layer measurement obtains the received power of the local node;
最小发射功率计算子模块， 配置为根据所述对端节点的发射功率、 以及所述本地节点的接收功率， 计算得到满足正常工作条件情况下， 所 述本地节点所需的最小发射功率电平； The minimum transmit power calculation submodule is configured to calculate the minimum transmit power level required by the local node when normal working conditions are met based on the transmit power of the counterpart node and the receive power of the local node;
电平等级确定子模块， 配置为根据预设的功率电平等级， 确定所述 最小发射功率电平对应的功率电平等级； The level determination sub-module is configured to determine the power level corresponding to the minimum transmit power level according to the preset power level;
功率控制子模块， 配置为通知所述交互模块在向所述对端节点发送 的帧数据中携带所确定的功率电平等级， 并以所述功率电平等级继续向 所述对端节点发送数据， 直至所述功率电平等级改变。 The power control submodule is configured to notify the interaction module to carry the determined power level in the frame data sent to the opposite node, and continue to send data to the opposite node at the power level. , until the power level changes.
6、根据权利要求 5所述无线体域网的开环联合功率控制装置，其中， 所述最小发射功率计算子模块通过以下方式计算得到满足正常工作条件 情况下， 所述本地节点所需的最小发射功率电平：
其中， / 表示所述最小发射功率电平， Pf表示所述对端节点的发射 功率， 表示所述本地节点能正确检测并解码信号的功率门限， 表示 所述本地节点的接收功率， C表示预调整系数。
6. The open-loop joint power control device of the wireless body area network according to claim 5, wherein the minimum transmit power calculation sub-module calculates in the following manner the minimum required by the local node when normal operating conditions are met. Transmit power level: Where, / represents the minimum transmit power level, P f represents the transmit power of the opposite node, represents the power threshold at which the local node can correctly detect and decode the signal, represents the received power of the local node, and C represents Pre-adjustment coefficient.
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| US20110195740A1 (en) * | 2010-02-05 | 2011-08-11 | Futurewei Technologies, Inc. | System and Method for Power Control in Distributed Networks |
| CN102340838A (en) * | 2011-07-18 | 2012-02-01 | 西安电子科技大学 | Medium access control method for prolonging network lifetime in wireless body area network |
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| US20110195740A1 (en) * | 2010-02-05 | 2011-08-11 | Futurewei Technologies, Inc. | System and Method for Power Control in Distributed Networks |
| CN102340838A (en) * | 2011-07-18 | 2012-02-01 | 西安电子科技大学 | Medium access control method for prolonging network lifetime in wireless body area network |
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