CN100547978C - A method for energy saving of media access control layer of wireless mesh network - Google Patents

A method for energy saving of media access control layer of wireless mesh network Download PDF

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CN100547978C
CN100547978C CN 200610134451 CN200610134451A CN100547978C CN 100547978 C CN100547978 C CN 100547978C CN 200610134451 CN200610134451 CN 200610134451 CN 200610134451 A CN200610134451 A CN 200610134451A CN 100547978 C CN100547978 C CN 100547978C
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wake
up
handshake
node
time
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CN101193016A (en
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于海斌
徐皑冬
鹏 曾
杨志家
军 王
邢志浩
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中国科学院沈阳自动化研究所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D70/00Techniques for reducing energy consumption in wireless communication networks
    • Y02D70/20Techniques for reducing energy consumption in wireless communication networks independent of Radio Access Technologies

Abstract

一种无线网状网络介质访问控制层节能方法,网络中的所有节点在时间同步的前提下,进行周期性同步的唤醒握手操作;对于有数据发送需求的节点,在唤醒握手时刻首先发送短时间的唤醒音通知目的节点其发送意图,然后使用基于竞争机制的信道访问方法发送数据帧;对于无数据发送需求的节点,则在唤醒握手时刻首先进行短时间的信道监听以检测信道活动,若感知到邻近节点的发送意图,保持接收状态以接收随后到达的数据帧,否则立即转入休眠模式;通过适应性唤醒握手机制适应负载的动态变化和突发性流量,并降低网络性能对“唤醒握手”周期设定的敏感性。 A wireless mesh network medium access control layer of energy-saving method, all nodes in the network under the premise of time synchronization, wake-up periodically synchronized handshake operations; for data transmission requirements of the node, first transmits a short time at the wake-up handshake wake-up tone informs the destination node sends intent, then send the data frame channel access method competitive mechanism based; for node sends demand no data, then wake handshake time first channel for a short time listening to detect channel activity, if perception is intended to transmit neighboring node, maintains a reception state to receive the data frames are then arrived, or immediately transferred to a sleep mode; adapt to the dynamic changes in load and bursty traffic adaptive wakeup handshake mechanism, and reduce network performance on the "wake-up handshake "cycle set sensitivity. 本发明使得网络中的所有节点能以很小的代价在很大程度上实现按需唤醒,因而具有良好的节能效果。 The present invention is such that all nodes in the network can be implemented with little cost in large wake-demand, which has a good energy saving effect.

Description

一种无线网状网络介质访问控制层节能方法 A wireless mesh network medium access control layer of energy-saving method

技术领域 FIELD

本发明属于无线网络通信领域,具体是用于无线网状(Mesh)网络中介质访问(MAC)层通信过程相邻节点间通信过程中的节能方法,属于一种MAC层节能机制。 The present invention belongs to the field of wireless communications network, particularly for wireless mesh (the Mesh) network media access (MAC) layer method for saving a communication procedure during communication between nodes adjacent to the MAC layer belongs to a power saving mechanism.

背景技术 Background technique

面向工业监测应用的无线Mesh网络的一个重要特点是:网络中用于数据采集和通信转发的节点是各类现场设备,它们的通信、存储能力非常有限,而且由于应用环境和成本的限制,大部分的节点依靠电池供电,因此如何实现节点以及整个网络的节能操作,从而延长其工作寿命是工业监测用无线Mesh网络急需解决的一个重要问题。 An important feature of wireless Mesh networks for industrial monitoring applications are: the network for data collection and communication nodes are forwarding all types of field devices, their communication, storage capacity is very limited, but due to the limitations and cost of application environments, large part of the node running on battery power, how to achieve energy-saving operation node and the entire network, thereby extending its working life is an important issue to address industrial monitoring using wireless Mesh network urgently needed.

现有针对无线Mesh网络节点的能耗分析表明,射频能耗是节点运行过程中的主要能耗,而要有效地降低射频能耗,目前存在两种可能的技术手段, 一是改进物理射频芯片的设计,在保证通信性能的前提下,降低射频芯片在各种操作状态下的功耗;二是通过设计新型的通信协议提高节点和网络的能量效率。 For existing wireless Mesh network node energy consumption analysis shows that radio frequency energy is the process node running major energy consumption, and to effectively reduce RF energy consumption, currently there are two possible technical means, first, to improve the physical RF chip design, to ensure that communication performance under the premise of reducing the power consumption of the RF chip under various operating states; second is to improve the energy efficiency of the network nodes and through the design of new communication protocols. 具体解决办法如下。 Specific solutions are as follows.

在无线Mesh网络中,"空闲监听"是导致能量浪费的一个主要因素,是通过协议优化设计实现节能所需解决的主要问题。 In wireless Mesh network, "idle listening" is one of the main factors leading to a waste of energy, energy-saving design of the main problems need to be addressed by protocol optimization. 所谓"空闲监听",是指网络中的节点由于无法预知其它节点何时会向自己发送数据帧,为了避免错过发给自己的数据帧,节点必须在自身无数据发送时,始终将射频保持在接收状态。 When the so-called "idle listening" refers to when the network node sends a data frame to their own inability to predict the other nodes, in order to avoid missing data frame addressed to itself, the node must not send data in itself, will always remain in RF receiving state. 而对于现有大部分商用射频芯片而言,其处于接收状态时的能耗基本上与处于发送状态的能耗处于同一数量级,因而"空闲监听"无疑会造成能量的极大浪费。 Energy consumption of existing and for most commercial radio chip, which is in the receiving state is basically the energy consumption in the sending state is in the same order of magnitude, thus "idle listening" will undoubtedly cause great waste of energy.

对"空闲监听"问题的解决需要对射频芯片进行休眠/唤醒控制,因而主要在MAC层实现,即通过设计有效融合休眠/唤醒控制策略的MAC协议, 尽可能地让节点在无数据收发需求时休眠。 Solution to the "idle listening" problem of the need for RF chip sleep / wake control, which are implemented at the MAC layer, namely the effective integration of the sleep / wake MAC protocol control strategy through design, so that node as much as possible when there is no demand for data transmission and reception sleep. 现有的方法基本上可以分为两类:第一类是采用基于调度的方法,比如S-MAC,T-MAC,TRAMA协议等。 Conventional methods can be substantially divided into two categories: The first category is based scheduling method, such as S-MAC, T-MAC, TRAMA protocol. 这类方法要求相邻节点间同步或全网络同步。 Such method requires synchronization between neighboring nodes or a whole network synchronization. 通过在相邻节点或全网络范围内实现相同的休眠/唤醒调度表, 一方面允许节点周期性的进入休眠状态以节能,另一方面也能确保相邻节点或所有节点同步唤醒进行数据通信。 By implementing the same in the adjacent node or dormant network wide / wake schedule, on the one hand allows the node periodically enter a sleep state to save power, it also ensures that all the nodes or the neighboring node wakeup synchronization in data communication. 但是由于休眠/唤醒调度表是预先设定的,这类协议无法很好地适应动态网络流量变化。 However, due to the sleep / wake schedule is set in advance, such agreements can not be well adapted to the dynamic changes in network traffic. 比如,假定节点A的休眠/唤醒调度表为x/y,其中x为在一个休眠/唤醒周期中的休眠时间,y为唤醒时间,则节点A必须在每个周期唤醒时间y,即使在这段时间内A实际上并无数据需要收发,这样就会影响节能效果。 For example, assume that node A sleep / wake schedule for the x / y, wherein x is in a sleep / wake-sleep cycle time, y is the wake-up time, the node A y must awake time in each cycle, even in this A period of time within virtually no data needs to be received, this will affect the energy-saving effect.

第二类方法是采用低功耗监听技术。 The second type is to use low-power monitoring approach. 在这类方法中,网络中的节点只需遵循统一的休眠/唤醒周期,无需保持同步的休眠/唤醒。 In such processes, nodes in the network just follow the unity of the sleep / wake cycle, without the need to synchronize the sleep / wake. 在一个周期内, 无数搌收发需求的节点通过延续极短时间的低功耗信道探测技术监听信道上的发送活动,若发现信道忙,则保持唤醒以接收可能发给自己的数据帧, 否则长时间保持在休眠状态;有数据发送需求的节点,必须发送一个长度不小于休眠/唤醒周期的前导序列以确保唤醒休眠节点,然后再发送数据。 In a cycle, many wipe node transceiver needs an extremely short time by the continuation of the low power channel detection technology transmission activity monitor channel, if the channel is found busy, the holder may be sent to wake up to receive their data frames or a long time remains in the sleep state; nodes with data transmission requirements, must send a length not less than the sleep / wake cycle to ensure that the leader sequence wake up sleeping nodes, and then send the data.

与第一类方法不同的是: The method of the first type is different:

1) 该技术不需要统一调度,各节点异步独立地进行周期性的休眠/唤醒 1) The technique does not require unified, independently of each node asynchronously periodic sleep / wake

#氛 #atmosphere

2) 在一个休眠/唤醒周期内,节点保持唤醒的时间由通信需求而定,在无通信需求时可全部保持休眠。 2) in a sleep / wake cycle, the node remain awake time determined by the communication requirements, can remain dormant in the absence of all communication needs.

这类方法的优点是实现了一定程度上的按需休眠与唤醒,无数据收发需求节点的休眠效率很高,其代价是:由于节点间异步的休眠与唤醒,发送数据的节点需要付出额外通知的代价(每次发送数据前,都需发送很长的前导序列来唤醒接收节点),并且这种代价会随着网络流量的增加而上升。 Advantage of these methods is to achieve a sleep and wake on demand to a certain extent, high sleep efficiency needs no data transceiver node, at the expense: Due to sleep and wake up between asynchronous nodes, the nodes transmit data need to pay extra notice price (before each transmission data are to be transmitted long preamble sequence to wake up the receiving node), and this will increase the cost of network traffic increases.

发明内容 SUMMARY

本发明的目的在于提出了一种能很好地适应动态网络流量变化、且不会出现随着网络流量的增加而需要付出额外通知的代价的适用于无线Mesh 网络的低功耗MAC层通信过程节能方法。 Object of the present invention to provide a well adapt to the dynamic changes in network traffic, and a low-power does not occur during communication with the MAC layer increases network traffic required to pay additional notifications are suitable for Wireless Mesh Networks energy-saving methods.

为了实现上述目的本发明的技术解决方案如下:网络中的所有节点在时间同步的前提下,进行周期性的、同步的"唤醒握手"操作;对于有数据发送需求的节点而言,在"唤醒握手"时刻首先发送短时间的"唤醒音"通知目的节点其发送意图,然后使用基于竟争机制的信道访问方法发送数据帧;对于无数据发送需求的节点而言,则在"唤醒握手"时刻首先进行短时间的信道监听以检测信道活动,若感知到邻近节点的发送意图,则保持接收状态以接收随后到达的数据帧,否则立即转入休眠模式; Technical Solution To achieve the above object of the present invention is as follows: all the nodes in the network under the premise of time synchronization, periodically "wake-up handshake" synchronous operation; for node has the data transmission requirements, the "Wake Up handshake "first sends a short time of" wake-up tone "is intended to send a notification destination node, and transmits a data frame using the channel access mechanism based on competition methods; no data for transmission in terms of the needs of the node, in the" wake-up handshake "time a first channel for a short time in order to detect channel activity monitor, if a neighboring node transmits intended perceived, is maintained reception state to receive the data frames are then arrived, or immediately transferred to a sleep mode;

通过适应性"唤醒握手"机制适应负载的动态变化和突发性流量,并降低网络性能对"唤醒握手"周期设定的敏感性;其中所述适应性唤醒握手为:是在周期性"唤醒握手"基础上的一种流量自适应方案;通过在相邻两个周期性"唤醒握手"之间增加适应性"唤醒握手",在一个周期性"唤醒握手"的周期内,可以根据当前流量情况进行多次报文传输,从而获得更好的带宽利用效果; By adaptively "wake-up handshake" dynamic change mechanism adapted to load and bursty traffic, and reduce network performance on the "wake-up handshake" sensitivity set period; wherein the adaptive wakeup handshake: is periodically "wake-up handshake "an adaptive scheme based on traffic; by adjacent two periodic" wake up the handshake "to increase the adaptability between" wake-up handshake ", a periodic" wake-up handshake "period, according to current traffic where multiple packet transmission, leading to better bandwidth utilization effect;

其中所述唤醒音是指节点在唤醒射频时刻其发送缓冲中有数据等待发送,则该节点在这段唤醒时间里发送一段预定义的前导序列;其中所述唤醒握手操作是一种节点唤醒射频由发送节点通知或由接收节点感知传输意图的行为;其中所述在唤醒握手时刻进行信道监听的短时间的长度:由时间同步的精度和射频硬件检测信道活动所需最小时间决定,即:2s + e:其中s为时间同步误差,e为射频硬件检测信道活动所需最小时间;在节点在 Wherein said wake-up tones are the node has data waiting for transmission at radio frequency wake-up time of its transmission buffer, then the node sends a predefined preamble sequence period in a wake-up time period; wherein said operation is a wake-up handshake RF wakeup node wherein in the wake-up handshake channel-sounding time length of a short time; notified by the sending node or the receiving node transmissions perceived by the intended behavior: the minimum time required to determine the accuracy of the detection and RF hardware channel activity by the time synchronization, namely: 2S + e: wherein s is a time synchronization error, e is the minimum time required for hardware detection RF channel activity; in node

周期性唤醒握手时检测到信道活动时,适应性唤醒握手之间的时间间隔为一次基于竟争机制的完整传输所需最长时间,包括最大退避时间,数据帧 Periodically wake channel activity is detected, the handshake between the adaptive wakeup time interval required for a handshake to complete transmission mechanism based on the most competitive time, including a maximum backoff time, the data frame

传输时间,等待ACK时间;若节点在适应性唤醒握手时仍然检测到了信道 Transmission time, ACK waiting time; if the node is still detected when the adaptive wakeup channel handshake

活动,则再增加1个适应性唤醒握手,直到在适应性唤醒握手时检测到信 Activity, then add an adaptive wakeup handshaking until the handshake is detected when the wake-up channel adaptive

道空闲;对于发送节点而言,只需保证在前一个适应性唤醒握手时刻发送 Idle channel; for the sending node, only to ensure a previous adaptive wakeup time to transmit handshake

唤醒音,即可保证预约到下一个适应性唤醒握手。 Wake-up sound, you can make an appointment to ensure adaptability wake up the next handshake.

本发明通过让网络中的所有节点进行周期性的,同步的"唤醒握手"搡作,使得网络中的所有节点能够以很小的代价在很大程度上实现了按需唤醒,因而具有良好的节能效果。 The present invention allows all nodes in the network periodically "wake-up handshake" for shoving, such that all nodes in the network can be largely small price to pay for on-demand wake-up, which has a good synchronization energy saving effect. 同时,本发明给出了一种流量自适应增强方案,可以很好地适应网络流量的动态变化以及突发性流量。 Meanwhile, the present invention presents a flow scheme adaptive enhancement can be well adapted to the dynamic changes in network traffic and bursty traffic.

本发明的优点: The advantages of the present invention:

1) 本发明通过周期性"唤醒握手"操作,在很大程度上实现了按需唤醒, 使得网络中的节点只在确实需要进行数据传输的时刻醒来进行数据收发。 1) of the present invention periodically "wake-up handshake" operation, wake-on-demand to a large extent realized, so that only network nodes transmit and receive data at a time to wake up does need for data transmission.

2) 由于"唤醒握手,,操作是同步进行的,所以发送节点只需在事先调度好的"唤醒握手"时刻醒来,发送很短的"唤醒音"即可确保唤醒接收节点。 2) As the "wake ,, handshaking operations are carried out simultaneously, the sending node simply schedule in advance a good" wake-up handshake "wake up time, a very short transmission" wake-up tone "to ensure that the receiving node wakeup.

3) 本发明同时给出了基于适应性"唤醒握手"机制的增强方案,可以较好地适应网络流量的动态变化以及突发性流量,并降低本发明的性能对"唤醒握手"周期设定的敏感性。 3) The present invention is also given based on adaptive "wake-up handshake" Enhancement Program mechanism, can better adapt to the dynamic changes in network traffic and bursty traffic, and reduce the performance of the invention on the "wake-up handshake" period setting sensitivity.

附困说明 Description attached trapped

图1是本发明的一个基础方法的工作原理示意图。 Figure 1 is a schematic view of the working principle of a basic method of the present invention.

图2是本发明的流量自适应增强方案的工作原理示意图。 FIG 2 is a flow schematic of the present invention works to enhance an adaptive scheme.

具体实施方式 Detailed ways

下面结合附图对本发明做进一步详细说明。 The following figures further detailed description of the present invention in combination.

本发明一种面向工业监测应用的无线Mesh网络MAC层节能方法:基于网络中所有节点通过网络同步协议进行同步,包括一个基础方法和一个流量自适应的增强方案。 Wireless Mesh Networks MAC layer present invention provides a power saving method for industrial monitoring applications: all nodes on the network synchronization, the method comprising a base and a traffic adaptive enhancement programs through a network synchronization protocol.

在本发明的基础方法中,网络中所有的节点将射频芯片置于休眠状态, 并周期性地、同步地、在所有节点在同一时刻醒来的时刻将射频唤醒很短的一段时间。 In the method of the present invention, all network nodes RF chip put to sleep, and periodically, in synchronism, all the nodes at the time of waking up at the same time radio frequency wake for a short period of time. 若节点在唤醒射频时刻其发送缓冲中有数据等待发送,则该节点在这段唤醒时间里发送一段预定义的前导序列,称之为"唤醒音";否则, 该节点在这段唤醒时间里将射频置于接收状态。 If the node wakeup time radio transmission buffer which has data waiting to be sent, then the node sends a predefined preamble sequence period in a wake-up time period, called the "wake-up tone"; otherwise, the wake-up time in the node in this placed in a radio frequency reception state. 由于节点唤醒射频的目的是通知(对于发送节点而言)或感知(对接收节点而言)传输意图,本发明将这种行为称为"唤醒握手"。 Since the object of the RF node wakeup notification (for purposes of the sending node) or sensor (receiving node terms) the transmission is intended, according to the present invention, this behavior as a "wake-up handshake."

当节点N需要发送数据时,必须暂时缓存数据并等待"唤醒握手"时刻到达,才可以发送"唤醒音"以通知目的节点其传输意图,然后采用基于竟争机制的信道访问控制方法(如CSMA/CA)竞争信道并进行数据发送。 When the node N needs to send data, must temporarily cache data and wait for the "wake-up handshake" time arrives, it may send a "wake-up tone" to inform the destination node that the transmission is intended, then use the channel access control based on competitive mechanisms (e.g., CSMA / CA) contention channel and data transmission. 若节点N在"唤醒握手"时刻到达时无数据需要发送,则将射频置于接收状态并信道状态来感知邻近节点的发送意图。 If the node N needs to be sent when no data in the "wake-up handshake" time arrives, the reception state will be placed in a radio frequency and transmits the channel status is intended to sense the neighboring nodes. 若节点N检测到信道忙,则表明其邻近节点中至少存在一个节点想要发送数据,节点N保持接收状态以接收随后到达的数据帧,并在接收 If the node detects the channel is busy N, it indicates the presence of adjacent nodes at least one node wants to transmit data, the node N maintains a reception state to receive the subsequent data frames arriving and receiving

充成后重新进入休眠状态;否则,节点N立即转入休眠状态以节能。 Re-enter into the sleep state after charging; otherwise, the node N immediately go to sleep to save power.

由于在"唤醒握手"时刻可能会有多个节点想要发送数据,因此可能会有多个节点同时发送"唤醒音",但由于发送"唤醒音"的目的只是为了使其目的节点检测到信道变忙,因而即使多个节点发送的"唤醒音"发生碰撞也不会影响机制的正确性。 Since there may be in the "wake-up handshake" time plurality of node wants to send data, so there may be a plurality of nodes simultaneously send a "wake-up tone", but the transmission destination "wake-up tone," it is only for the destination node detects the channel It gets busy, so even if multiple nodes send "wake-up tone" collision will not affect the correctness of the mechanism.

"唤醒音"的长度由时间同步的精度和射频硬件检测信道活动所需最小 And accuracy required minimum frequency hardware length detecting channel activity "wake up sound" by the time synchronization

时间决定。 Time to decide. 假定时间同步误差为s,射频硬件检测信道活动所需最小时间为 It is assumed that time synchronization error s, the minimum time required for the RF hardware to detect channel activity

e,贝'J"唤醒音"的最小长度为2s + e。 e, Tony 'J "wake-up tone" minimum length of 2s + e.

图1给出了本发明的上述基础方法的一个实施例。 Figure 1 shows the basic method of the present invention, the above-described one embodiment. 图中第一发送节点A 和第二发送节点B在休眠时产生了目的节点C的数据发送需求,它们暂时 FIG first transmission node A and node B generates a second transmit data transmission requirements destination node C is in sleep, they are temporarily

将数据缓存并等待"唤醒握手"时刻到达。 The data cache and wait for the "wake-up handshake" moment arrives. 在"唤醒握手"时刻,节点第一发送 In the "wake-up handshake" time, first sending node

节点A,第二发送节点B和目的节点C同时唤醒射频。 Node A, Node B and a second transmission destination node C's wakeup radio. 第一发送节点A和第二发送节点B因为有数据发送需求而同时发送"唤醒音",目的节点C因无数据发送需求而将射频置于接收状态,因而检测到"唤醒音"并保持接收状态。 A first transmitting node A and the second transmission node B because the data transmission requirements simultaneously send a "wake-up tone", the destination node C due to no data transmission requirements placed on the radio reception state, and thus detection of a "wake-up tone" receiving and holding status. 随后第一发送节点A和第二发送节点B采用基于竞争机制的信道访问控制方法(如CSMA/CA)竟争信道。 Then transmitting a first node A and the node B transmitting the second channel access control method using contention-based mechanism (e.g. CSMA / CA) competition channel. 第一发送节点A首先完成随机退避, 竟争到信道,开始数据传输过程,而第二发送节点B则只能等到下一个"唤醒握手"时刻来临继续发送"唤醒音"。 A first node transmits a first random backoff complete, competitive channel to start data transmission, the second transmission node B can only wait for the next "wake-up handshake" continues to send the time comes to "wake up sound."

由于在进行周期性"唤醒握手"时,可能会有多个节点想要发送数据,但最终在一个冲突域内只有一个发送节点能够成功竟争到信道,也就是说, 在一个周期性"唤醒握手"的周期内,最多只能进行一次成功的报文传输。 Because during periodic "wake-up handshake", there may be multiple node wants to send data, but in the end in a collision domain is only one node can send successfully to channel competition, that is to say, in a periodic "wake-up handshake in the "cycle can only be a successful packet transmission. 这样,周期性"唤醒握手"的周期设定与网络负载紧密相关。 In this way, periodically "wake-up handshake" The period setting is closely related to network load. 若该值设定过小, 网络节点频繁地唤醒,但通常检测不到传输请求,从而造成能量浪费;反之,若该值设定过大,虽然可以获得较好的节能效果,但在网络负载较大时,会造成网络带宽利用不充分,大量报文堆积在各节点的发送缓冲,甚至由于缓冲溢出而被丢弃。 If the value is set too low, the network node wake up frequently, but usually not detected transmission request, resulting in waste of energy; the other hand, if the value is set too high, although the energy saving effect can be obtained good, but the network load large, will cause insufficient network bandwidth utilization, a large number of packets accumulated in the transmission buffer of each node, due to the buffer overflow even be discarded. 由于在实际应用中,要想事先确切地获得一个准确的网络负载值并不容易,并且事件触发的网络流量具有极强的随机性和突发性,因而本发明在上述基本同步信道监听机制的基础上,提出了一种流量自适应增强方案,如附图2所示。 Since in the practical application, in order to obtain an accurate advance exactly network load value is not easy, and the event-triggered network traffic with strong randomness and unexpected, and the present invention, in the basic synchronization channel-sounding mechanism proposed based on an adaptive flow enhancement scheme 2 as shown in the accompanying drawings.

在增强方案中,网络节点在周期性"唤醒握手,,的基础上,增加了适应性"唤醒握手"。适应性"唤醒握手"是在周期性"唤醒握手"基础上的一种流量自适应方案。通过在相邻两个周期性"唤醒握手"之间增加适应性"唤醒握手", In enhanced embodiments, the network node periodically "wake-up handshake ,, based on an increase of adaptability" wake-up handshake. "Adaptive" wake-up handshake "is periodically" wake-up handshake "A flow based on adaptive program. by increasing the adaptability between two adjacent periodically "wake-up handshake" "wake-up handshake"

在一个周期性"唤醒握手"的周期内,可以根据当前流量情况进行多次报文传输,从而获得更好的带宽利用效果。 In a periodic "wake-up handshake" cycle may be performed repeatedly according to the current packet transmission traffic conditions, leading to better bandwidth utilization effect.

节点在周期性"唤醒握手"的基础上,增加适应性"唤醒握手"的规则为:1) 若节点在周期性"唤醒握手"时检测到了信道活动,则即时增加1个适应性"唤醒握手",适应性"唤醒握手"之间的时间间隔为一次基于竟争机制 Node on a periodic basis "wake handshake" on the increased adaptability "wake-up handshake" rules: 1) If the node periodically "wake-up handshake" channel activity is detected, then immediately increase the adaptability of a "wake-up handshake "adaptability" wake-up time between a handshake "interval is based on a competitive mechanism

的完整传输所需最长时间(包括最大退避时间,数据帧传输时间,等待ACK The maximum time required to complete transmission (including a maximum backoff time, the data frame transmission time, waiting for an ACK

时间); time);

2) 若节点在适应性"唤醒握手"时仍然检测到了信道活动,则再增加1 2) If the adaptation node is still detected channel activity to "wake-up handshake", then add 1

个适应性"唤醒握手",直到在适应性"唤醒握手"时检测到信道空闲。 Adaptability of a "wake-up handshake" is detected when the channel is idle until adaptation "wake-up handshake." 这样,对于发送节点而言,只需保证在前一个适应性"唤醒握手"时刻发 Thus, for purposes of the sending node, only to ensure a previous adaptive "wake-up handshake" time made

送"唤醒音",即可保证预约到下一个适应性"唤醒握手"。 To give a "wake-up tone", you can make an appointment to ensure that the next adaptation "wake up shaking hands."

流量自适应增强方案可以很好地适应网络负载的动态变化,以及突发 Traffic Adaptive boosting scheme can be well adapted to the dynamic changes in network load, and a burst

性流量,并且可以有效降低网络性能对"唤醒握手"周期设定的敏感性。 Of traffic, and can effectively reduce network performance on the "wake-up handshake" sensitive period set.

Claims (6)

1.一种无线网状网络介质访问控制层节能方法,其特征在于:网络中的所有节点在时间同步的前提下,进行周期性的、同步的“唤醒握手”操作;对于有数据发送需求的节点而言,在“唤醒握手”时刻首先发送“唤醒音”通知目的节点其发送意图,然后使用基于竞争机制的信道访问方法发送数据帧;对于无数据发送需求的节点而言,则在“唤醒握手”时刻首先进行信道监听以检测信道活动,若感知到邻近节点的发送意图,则保持接收状态以接收随后到达的数据帧,否则立即转入休眠模式; 通过适应性“唤醒握手”机制适应负载的动态变化和突发性流量,并降低网络性能对“唤醒握手”周期设定的敏感性;其中所述适应性“唤醒握手”为:是在周期性“唤醒握手”基础上的一种流量自适应方案;通过在相邻两个周期性“唤醒握手”之间增加适应性“ Layer 1. A method of saving wireless mesh network medium access control, characterized in that: all the nodes in the network under the premise of time synchronization, periodically, the synchronization "wake-up handshake" operation; For data transmission requirements for node, the "wake-up handshake" first time to send a "wake tone" notification destination node sends its intentions, then send the data frame channel access method based on the mechanism of competition; in terms of demand for node sends no data, then wake up " handshake "time first channel snooping to detect channel activity, if the transmission is intended to neighboring nodes perceived, is maintained reception state to receive the data frames are then arrived, or immediately transferred to a sleep mode; by adaptively" wake-up handshake "mechanism adapted to load dynamic changes and bursty traffic, and reduce network performance on the "wake-up handshake" sensitivity set period; wherein said adaptive "wake-up handshake" is: a flow is periodically "wake-up handshake" on the basis of adaptive scheme; by adjacent two periodic "wake-up handshake" between the added flexibility " 醒握手”,在一个周期性“唤醒握手”的周期内,根据当前流量情况进行多次报文传输,从而获得更好的带宽利用效果。 Wake handshake ", a periodic" wake up the handshake "period, multiple packet transmission according to the current traffic situation, leading to better bandwidth utilization effect.
2. 按权利要求l所述无线网状网络介质访问控制层节能方法,其特征在于:其中所述"唤醒音"是指节点在唤醒射频时刻其发送缓冲中有数据等待发送,则该节点在这段唤醒时间里发送一段预定义的前导序列。 2. The power saving method as claimed in claim l wireless mesh network medium access control layer, characterized in that: wherein the "wake-up tone" means that a node has data waiting for transmission at radio frequency wake-up time of its transmission buffer in the node this wake-up time. send for a predefined preamble sequence.
3. 按权利要求l所述无线网状网络介质访问控制层节能方法,其特征在于:其中所述"唤醒握手"操作是一种节点唤醒射频由发送节点通知或由接收节点感知传输意图的行为。 3. The power saving method as claimed in claim l wireless mesh network medium access control layer, characterized in that: wherein the "wake-up handshake" operation is a wake-up radio node notified by the sending node or transmitted by the receiving node senses the intended behavior .
4. 按权利要求l所述无线网状网络介质访问控制层节能方法,其特征在于:其中所述在"唤醒握手"时刻进行信道监听的"唤醒音"长度:由时间同步的精度和射频硬件检测信道活动所需最小时间决定,即:2s + e:其中s为时间同步误差,e为射频硬件检测信道活动所需最小时间。 4. The power saving method as claimed in claim l wireless mesh network medium access control layer, characterized in that: wherein said channel listens "wake-up tone" length "wake-up handshake" moment: a time synchronization accuracy and RF hardware detecting channel activity required minimum time determined, i.e.: 2s + e: wherein s is a time synchronization error, e is a radio frequency channel activity detection hardware required minimum time.
5. 按权利要求l所述无线网状网络介质访问控制层节能方法,其特征在于:若节点在周期性"唤醒握手"时检测到信道活动时,适应性"唤醒握手"之间的时间间隔为一次基于竞争机制的完整传输所需最长时间,包括最大退避时间,数据帧传输时间,等待ACK时间。 5. The power saving method as claimed in claim l wireless mesh network medium access control layer, characterized in that: if the node detects channel activity when the periodic "wake-up handshake" adaptive "wake-up handshake" interval of time between the It is a complete transmission mechanism of competition based on the desired maximum time, including maximum backoff time, data transfer time frame, waiting for an ACK time.
6. 按权利要求1所述无线网状网络介质访问控制层节能方法,其特征在于:若节点在适应性"唤醒握手"时仍然检测到了信道活动,则再增加l 个适应性"唤醒握手",直到在适应性"唤醒握手"时检测到信道空闲;对于发送节点而言,只需保证在前一个适应性"唤醒握手"时刻发送"唤醒音",即可保证预约到下一个适应性"唤醒握手"。 6. The wireless mesh network according to claim media access control layer of energy-saving method of claim 1, wherein: if the node is still detected channel activity when adaptive "wake-up handshake", then add an adaptable l "wake-up handshake" until adaptability "wake-up handshake" idle channel is detected; for the sending node, only to ensure a previous adaptive "wake-up handshake" transmission time "wake-up tone", to ensure adaptability to the next appointment " wake handshake. "
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