WO2011157087A1 - Procédé et système de commutation rapide dans un réseau de capteurs sans fil - Google Patents

Procédé et système de commutation rapide dans un réseau de capteurs sans fil Download PDF

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WO2011157087A1
WO2011157087A1 PCT/CN2011/073823 CN2011073823W WO2011157087A1 WO 2011157087 A1 WO2011157087 A1 WO 2011157087A1 CN 2011073823 W CN2011073823 W CN 2011073823W WO 2011157087 A1 WO2011157087 A1 WO 2011157087A1
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subnet
mobile user
cluster head
head node
value
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PCT/CN2011/073823
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English (en)
Chinese (zh)
Inventor
裴庆祺
沈玉龙
李京英
姜晓鸿
尹浩
徐启建
马建峰
唐宏
吴作顺
Original Assignee
西安电子科技大学
中国电子设备系统工程公司研究所
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Application filed by 西安电子科技大学, 中国电子设备系统工程公司研究所 filed Critical 西安电子科技大学
Publication of WO2011157087A1 publication Critical patent/WO2011157087A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements

Definitions

  • the invention relates to the field of short-range wireless communication, in particular to a handover scheme of a mobile user in a clustering model of a wireless sensor network, which is specifically a signal strength indicator (RSI) and a link quality indicator index (LQI) in a wireless sensor network.
  • RSI signal strength indicator
  • LQI link quality indicator index
  • Wireless sensor network is a brand-new information acquisition platform. It has the advantage of being incomparable with other networks in information acquisition. It can monitor and collect information of various monitoring objects in the network distribution area in real time to achieve complex target within specified range. Detection and tracking can greatly compensate for the shortcomings of wireless network information collection. It has the characteristics of rapid deployment and strong resistance to destruction, and has broad application prospects.
  • Wireless sensor networks are made up of a large number of low-cost micronodes, which are typically battery-powered and work long-term in an unattended environment, often without replacing the battery. This requires efficient management and use of resources during wireless sensor network operation, reducing energy consumption, maximizing network lifetime and ensuring network connectivity for maximum long working hours.
  • a wireless sensor network consists of a sensor node, a subnet cluster head node, and a user.
  • a large number of sensor nodes are deployed in the monitoring area and set up a network.
  • the use of mobile-capable nodes to actively collect information can reduce the number of hops from the sensor nodes to the cluster head nodes, thereby saving energy, and can actively collect information in each subnet. Ensure network connectivity. Therefore, research on the mobility management of nodes and the manner of handover are introduced.
  • the traditional wireless sensor network mobile switching method has the following steps: First, the signal strength indicator RSSI is used as the handover criterion, and compared with the system preset parameters. If the system threshold is reached, the inter-subnet is started. Switching; the second step, scanning all subnets in the sensor network, selecting the subnet with the best performance as the switcher The third step is to complete the switch between subnets. If the switch fails, the connection is directly disconnected.
  • RSSI signal strength indicator
  • the decision criterion for handover can result in false switching or frequent switching. Since the RSSI is greatly affected by the environment, and sometimes the RSSI change is not caused by the mobile user moving away from the cluster head node, or because multiple mobile users compete for channels or signal interference between multiple nodes, so only rely on RSSI as a reference method for decision criteria often results in false switching or frequent switching, which not only wastes a lot of network resources, but also increases the packet loss rate and network throughput. In extreme cases, service may also occur for a long time. The situation of the interruption.
  • the mobile user When it is determined that a handover is required, the mobile user needs to scan all the subnets during the scanning phase, obtain the information therein, and decide which subnet to switch to, which causes a waste of time.
  • the reality is that the subnet to be accessed by the mobile user only needs to be selected among several adjacent subnets. Scanning all subnets not only causes waste of time, but also the delay caused by the scanning phase is the longest, which reaches The entire switching delay is about 90%.
  • the object of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a fast switching method and system based on a signal strength indicator index RSSI and a link strength indicator index LQI in a wireless sensor network, so as to reduce scan delay, handover delay and Data packet loss rate, increase network throughput and extend network lifetime.
  • the present invention provides a fast switching method based on RSSI and LQI in a wireless sensor network, including:
  • the signal strength indicator index RSSI and the link quality indicator index LQI information of the cluster head nodes of each subnet are obtained, and the signal strength indicator index RSSI and the link quality indicator index LQI information of each subnet are obtained.
  • Calculate the R value of each subnet select the first subnet to be joined according to the R value of each subnet, and send an association request;
  • the cluster head node of the first subnet determines, according to the association request, that the mobile user is allowed to join the subnet, and the mobile user accesses the first subnet;
  • the cluster head node of the first subnet acquires a signal strength indicator
  • the RSSI and the link quality indicator metric LQI value are generated, the location information of the mobile user is obtained according to the ⁇ , and the mobile user's next time position is predicted, and whether the handover process is triggered is determined; if yes, according to the prediction information
  • the location information of the mobile subscriber is acquired at the next moment, and the signal strength and link quality information of the cluster head nodes of each new subnet covering the area are obtained, and the values of the subnets are calculated, and the second subnet to be joined is selected according to the value. And send an association request;
  • the cluster head node of the second subnet decides to allow the mobile user to access according to the association request, the mobile user accesses the second subnet, and disconnects from the first subnet.
  • the implementation steps of the method include the following:
  • the mobile user enters the wireless sensor network to send a scan request, and then obtains the signal strength and link quality information of the cluster head nodes of each subnet through the active scan response, and the signal strength and link quality information of each subnet, Calculate the R value of each subnet, store these R values in the register, and then select the subnet with the largest R value from the register as the subnet to be joined, and send the association request;
  • the subnet cluster head node decides whether to allow the user to join the subnet according to the user mobility status, the requested service type, and the current subnet resource information in the user association request; if the user is allowed to join the subnet, go to the step (3), otherwise, the R value is searched from the register second only to the subnet of the subnet used as the available subnet, and the association request is sent;
  • the subnet cluster head node sends an association response to the user requiring access to the subnet
  • the user submits a bandwidth usage request to the sub-cluster head node according to the specific conditions of the current service, including the number of used time slots and the usage time;
  • the sub-cluster head node After receiving the bandwidth request from the user, the sub-cluster head node determines whether to approve the application according to the current status of the subnet; if the subnet provides the resource within the capability, the application is approved and the application is successfully sent to the user. In response, go to step (6); if the ability of the subnet to provide resources is exceeded, send the maximum bandwidth information that the current subnet can provide to the user, and go to step (8);
  • the user determines whether to join the subnet according to the current traffic volume. If the maximum bandwidth provided can meet the requirements of the service, then choose to join the subnet, start using the resources of the subnet, and go to the step. (8), otherwise find the R value from the register next to the subnet of the subnet used as the available subnet, go to step (3);
  • the cluster head node After the mobile user accesses the subnet, at every T time, if there is data transmission between the mobile user and the cluster head node, the cluster head node directly reads the signal strength indicator RSSI from the transmitted data frame. And the link quality indicator index LQI value, if no data transmission occurs, the mobile user sends an empty data frame to the sub-cluster cluster head node, and the signal strength indicator index RSSI and the link quality indicator index LQI value are read out from the frame.
  • step (9) Using ⁇ to compare with a preset system threshold, if ⁇ is in the threshold area, the cluster head node sends a location information request to the mobile user, and after receiving the request, the mobile user sends the location information to the cluster head node. Go to step (10); Otherwise, go to step (8);
  • the cluster head node After receiving the location information of the mobile user, the cluster head node predicts the location of the next moment of the user, and determines whether the handover process is triggered by the location information of the time of the mobile node; if the handover is triggered, the process proceeds to step (11). Otherwise go to step (8);
  • the cluster head node of the atomic network sends an active scan to the cluster head nodes of each new subnet covering the area according to the location information of the user at the next moment in the prediction information; and acquires the cluster head nodes of each new subnet through the active scan response Signal strength and link quality information, and calculate the value of each subnet, store it in the register, and then select the subnet with the largest value from the register as the subnet to be joined, and send the association request;
  • the atomic network cluster head node sends an association request to the new subnet cluster head node according to the mobile user type, the motion state and the service type, and proposes a bandwidth request;
  • the new subnet cluster head node decides whether to allow the user to join its subnet according to the bandwidth request in the association request; if the user is allowed to join the subnet, go to step (14); otherwise, look up the value from the register. After the subnet that uses the subnet is the available subnet, send the association request and repeat step (11);
  • the new subnet cluster head node decides whether to allow the mobile node to access according to the maximum bandwidth that can be provided by itself; if access is allowed, the atomic network cluster head node notifies the user to switch to the new subnet, and proceeds to the step ( 15); Otherwise, the value of the ⁇ value from the register is second only to the subnet of the subnet used as the available subnet, go to step (12);
  • the atomic network cluster head node After the user accesses the new subnet, if the atomic network cluster head node still stores the user's data, the atomic network cluster head node sends the data to the new subnet cluster head node, which is handed over to the user;
  • the invention also provides a fast switching system based on RSSI and LQI in a wireless sensor network, comprising: a mobile user, after entering the wireless sensor network, acquiring a signal strength indication index RSSI and a link of a cluster head node of each surrounding subnet.
  • the quality indicator index LQI information, and the signal strength indicator index RSSI and the link quality indicator index LQI information of each subnet are used to calculate the R value of each subnet, and the first sub-join to be added is selected according to the R value of each subnet.
  • a cluster head node of the first subnet configured to receive the association request sent by the mobile user, determine, according to the association request, that the mobile user is allowed to join the subnet, and the mobile user accesses the first After the subnet, obtaining the signal strength indicator index RSSI and the link quality indicator index LQI value, generating ⁇ , obtaining the location information of the mobile user according to ⁇ , and Predicting the location of the next moment of the mobile user, determining whether the handover process is triggered; if yes, obtaining the signal strength of the cluster head nodes of each new subnet covering the area according to the location information of the mobile subscriber at the next moment in the prediction information Link quality information, and calculating the value of each subnet, selecting a second subnet to be joined according to the value, and sending an association request;
  • the cluster head node of the second subnet is configured to allow the mobile user to access the second subnet according to the association request sent by the cluster head node of the first subnet.
  • the present invention uses the R value weighted by the signal strength indicator index RSSI and the link quality indicator index LQI as the system preset parameter, instead of using the RSSI as the system preset parameter in the conventional sense, the accuracy is
  • the aspect LQI is slightly higher than the RSSI, and the two are indicators indicating different categories. Therefore, using this method can greatly improve the accuracy and avoid mis-switching.
  • the present invention calculates the R values of each subnet and sorts them into registers according to the order from largest to smallest. Then, subnet selection by each R value can effectively balance the network energy and prolong the network life; especially when the selection of the pre-join subnet and the pre-switch subnet fails, the entire pre-join or pre-handover can be quickly restored.
  • the process without having to disconnect the network and then rescan, can greatly reduce scan latency, reduce signaling interactions, and reduce overall system overhead.
  • the present invention adopts the prediction of the geographical position in the pre-handover, and can accurately determine the subnet covering the position of the mobile node at the next moment, thereby greatly reducing the number of scanning subnets;
  • the total handover delay is 90%, so the handover delay can be greatly reduced, and the service with higher real-time requirements can provide better service.
  • the present invention uses a progressive decision criterion for handover decision.
  • the first condition is to determine whether ⁇ is within the system preset threshold area, and after the first condition is reached, the second condition is triggered, and the second condition is judgment. Whether the moving position of the mobile node at the next moment exceeds the coverage of the atomic network, and once the coverage of the atomic network is exceeded, the handover is triggered.
  • FIG. 1 is a schematic structural diagram of a wireless sensor network used in the present invention
  • FIG. 3 is a sub-flow diagram of the present invention for pre-joining using R values in the process of implementing fast handover;
  • FIG. 4 is a sub-flow diagram of the present invention for performing handover using a progressive decision criterion in implementing a fast handover procedure
  • FIG. 5 is a schematic diagram of a conventional mobile handover procedure
  • FIG. 6 is a schematic structural diagram of a fast switching system provided by the present invention. detailed description
  • the network structure used by the present invention is composed of a wireless sensor common node, a subnet cluster head node, and a mobile user.
  • the wireless sensor common node collects the information of the physical environment and transmits the information to the sub-cluster head node through the wireless link; the sub-cluster head node is responsible for merging the received information and rationally allocating the internal resources of the subnet; Inject queries and gather information into the network.
  • the subnet cluster head nodes are connected together by a wired network or a wireless network, and the subnets are combined to form a flexible and scalable wireless sensor network.
  • This network structure provides a variety of data services and applications, and supports multiple mobile users to use network resources at the same time.
  • the mobile user in the embodiment of the present invention refers to a mobile node, which may be a mobile terminal, and is referred to as a mobile user for ease of understanding.
  • the present invention provides a fast switching method based on RSSI and LQI in a wireless sensor network, including: S1: After a mobile user enters a wireless sensor network, acquires a signal strength indicator of a cluster head node of each surrounding subnet.
  • the RSSI and the link quality indicator index LQI information are calculated by the signal strength indicator index RSSI and the link quality indicator index LQI information of each subnet, and the R value of each subnet is calculated, and the R value of each subnet is selected to be added.
  • the first subnet and send an association request;
  • S2 the cluster head node of the first subnet decides to allow the mobile user to join the subnet according to the association request, and the mobile user accesses the first subnet;
  • the cluster head node of the first subnet After the mobile user accesses the first subnet, the cluster head node of the first subnet obtains the signal strength indicator index RSSI and the link quality indicator index LQI value, generates ⁇ , obtains the location information of the mobile user according to the ⁇ , and predicts the movement. The next time position of the user determines whether the handover process is triggered; if yes, the signal strength and link quality information of the cluster head nodes of each new subnet covering the area are obtained according to the location information of the mobile subscriber at the next moment in the prediction information. And calculating the R" value of each subnet, selecting the second subnet to be joined according to the value, and sending an association request;
  • S4 The cluster head node of the second subnet decides to allow the mobile user to access according to the association request, and the mobile user accesses the second subnet and disconnects from the first subnet.
  • the present invention provides a fast switching method based on RSSI and LQI in a wireless sensor network, and the specific implementation steps are as follows:
  • Step 1 The mobile user enters the wireless sensor network and obtains network information through an active scan request.
  • Step 2 Each sub-cluster head node sends an active scan response to the mobile user.
  • Step 3 The mobile user compares the received active scan response to determine the subnet to join, and sends an association request to the cluster head node of the subnet.
  • the mobile user obtains the signal strength indicator index RSSI and the link quality indicator indicator LQI of each subnet from the received active scan response;
  • RSSI is the measured signal strength indicator of each subnet
  • RSSI_L is the same as RSSI derived from the measured link quality indicator LQI value of each subnet. value, is the weight of RSSI
  • RSSI _ L ⁇ is the weight
  • Step 4 The subnet cluster head node determines whether to allow the mobile user to join the subnet according to the user mobility status, the requested service type, and the current subnet resource information in the mobile user association request.
  • the mobile user's mobile state is divided into a high-speed motion state, a medium-speed mobile state, and a low-speed mobile state; the mobile user's service type is divided into real-time service and non-real-time service. If the mobile user is allowed to join the subnet, go to step 5; otherwise, look for the available subnet from the register and go to the send association request in step 3.
  • the specific implementation method is as shown in Figure 3:
  • Step 5 The subnet cluster head node returns an association response to the mobile user.
  • Step 6 The mobile user submits a bandwidth usage request to the sub-cluster head node according to the specific situation of the current service, including using the number of slots and the usage time;
  • Step 7 After receiving the bandwidth usage request of the mobile user, the sub-cluster head node determines whether to approve the bandwidth usage application according to the current status of the subnet. If the subnet provides the resource within the capability of the subnet, the bandwidth usage application is approved. And moving to The user sends a successful application response, go to step 8; if the ability to provide resources beyond the subnet is exceeded, send the maximum bandwidth information that the current subnet can provide to the mobile user, go to step 9;
  • Step 8 The mobile user starts to use the subnet resource according to the information that the bandwidth usage request is approved by the received cluster head node, and proceeds to step 10;
  • Step 9 After receiving the maximum bandwidth information, the mobile user determines whether to join the subnet according to the current traffic. If the maximum bandwidth provided can meet the requirements of the service, then choose to join the subnet, start using the resources of the subnet, and go to Step 10; Otherwise, look up the available subnets from the register, and go to the sending association request in step 3.
  • the specific implementation method is as shown in Figure 3:
  • Step 10 After the mobile user accesses the subnet, every time period T, if there is data transmission with the cluster head node of the subnet, the cluster head node directly reads the RSSI and LQI values from the transmitted data. If there is no data transmission in the subnet, after the mobile user sends an empty data frame, the cluster head node reads the RSSI and LQI values from the received null data frame, and generates the following formula:
  • R' w,' X RSSI' + w 2 ' X RSSI _ l!
  • RSS ⁇ is the measured signal strength indicator of the mobile user
  • W ⁇ - is the measured link quality indicator of the mobile user
  • the value of the index LQI value derived from the RSSI is the weight of the weight
  • w 2 ' is the weight of -
  • the value of ⁇ and 1 ⁇ is determined by the distance between the sub-cluster head node and the mobile user.
  • the period T can be preset according to needs, for example, the default is 0.5s, and then dynamically adjusted according to the motion state of the mobile user. If the moving speed of the mobile user is faster, the value of the period T can be shortened, if the moving speed of the mobile user Slower, you can extend the value of period T;
  • Step 11 Use ⁇ to compare with the preset system threshold area, if ⁇ is in the threshold area, go to step 12; if ⁇ is not in the threshold area, go to step 10;
  • Step 12 The cluster head node sends a request to the mobile user, requesting the mobile user to send its current location information.
  • Step 14 After receiving the location information of the mobile user, the original cluster head node starts a second-order AR prediction algorithm to predict the mobile user. Next moment position ( , And according to ( "_ ⁇ *)) 2 + « _ 3 ⁇ )) 2 ⁇ 2 , judge whether the switching process is triggered, where XW , W represents the plane position information of the cluster head node of the current subnet, and r represents the current subnet.
  • XW represents the plane position information of the cluster head node of the current subnet
  • r represents the current subnet
  • Step 15 The atomic network cluster head node sends an active scan request to each new sub-network cluster head node covering the area according to the location information of the mobile user at the next moment in the prediction information.
  • Step 16 Each sub-cluster head node sends an active scan response to the cluster head node of the atomic network.
  • Step 17 The atomic network cluster head node determines a new subnet to be joined by the mobile user according to the received active scan response, and sends an association request to the cluster head node of the new subnet.
  • the atomic network cluster head node obtains the signal strength indicator index RSSI and the link quality indicator index LQI of each new subnet from the received active scan response;
  • R" ⁇ X RSSI" + w 2 " X RSSI _ i!'
  • R ⁇ W ⁇ is the measured signal strength indicator for each new subnet
  • W ⁇ - is the actual new subnet
  • the value of the link quality indicator LQI value derived from the RSSI is the weight of ⁇ , which is the weight of RSSI- ⁇ , and the values of 1 and 1 ⁇ " are determined by the cluster head node of the atomic network. The distance between the cluster head nodes of each new subnet is determined.
  • Step 18 The new subnet cluster head node determines whether to allow the mobile user to join the subnet according to the user mobility status, the requested service type, and the current subnet resource information in the association request, if the mobile user is allowed to join the subnet, then Go to step 19; otherwise, look up the available subnets from the register and send the association request.
  • the specific implementation method is as shown in Figure 3:
  • step 17 If the mobile user is not allowed to join the subnet, select the subnet with the R 11 value d from the register as the pre-joined new subnet; where ⁇ ⁇ is ⁇ ⁇ ⁇ "" is not currently selected The maximum value that has passed, that is, the largest value among the smaller unselected values. 3g) Then go to step 17 to send an association request to the pre-joined new subnet.
  • Step 19 The new subnet cluster head node sends an association response to the atomic network cluster head node.
  • Step 20 The cluster head node of the atomic network proposes a bandwidth usage application to the cluster head node of the new subnet according to the specific situation of the current service of the mobile subscriber, including using the number of slots and the usage time.
  • Step 21 After receiving the bandwidth usage request of the cluster head node of the atomic network, the cluster head node of the new subnet determines whether to approve the application according to the current status of the subnet, and if the capability of the subnet is provided, the bandwidth usage application Approved, and send a successful application response to the cluster head node of the atomic network, go to step 22; if the ability of the subnet to provide resources is exceeded, send the maximum bandwidth information that the current subnet can provide to the cluster head node of the atomic network, go to the step twenty three.
  • Step 22 The atomic network cluster head node proceeds to step 24 according to the bandwidth usage request approval information sent by the new subnet cluster head node.
  • Step 23 After receiving the maximum bandwidth information, the cluster head node of the atomic network determines whether to join the new subnet according to the current traffic volume. If the maximum bandwidth provided can meet the requirements of the service, then select to join the new subnet, and go to the step. 24; Otherwise, look up the available subnet from the register, and then go to the send association request in step 17, the specific implementation method is as shown in Figure 3: 3f) If the mobile user is not allowed to join the subnet, the value selected from the register The subnet of ⁇ is the pre-joined subnet; where, is the maximum value currently not selected in ⁇ , ⁇ ..., ⁇ ", that is, the largest value among the smaller unselected values.
  • step 17 Then go to step 17 to send an association request to the pre-joined subnet.
  • Step 24 The atomic network cluster head node notifies the mobile user to switch to the subnet covered by the new subnet cluster head node.
  • Step 25 After the mobile user accesses the new subnet, start using the subnet resources of the new subnet and disconnect from the atomic network.
  • Step 26 After the mobile user accesses the new subnet, if the atomic network cluster head node still has the data of the mobile user, the atomic network cluster head node sends the data to the new subnet cluster head node, and the data is forwarded to the mobile user. .
  • Step 27 Traverse all new subnets in the coverage area. If the mobile user's request is not met, the mobile user disconnects from the atomic network and switches using the traditional hard handover mode.
  • the traditional hard handover mode is shown in the handover process in FIG. 5, and the present invention is not described too much.
  • the present invention also provides a fast switching system based on RSSI and LQI in a wireless sensor network, including:
  • the mobile user 601 After entering the wireless sensor network, the mobile user 601 obtains the signal strength indicator index RSSI and the link quality indicator index LQI information of the cluster head nodes of each subnet, and the signal strength indicator index RSSI and link quality of each subnet Indicating the indicator LQI information, calculating the R value of each subnet, selecting the first subnet to be joined according to the R value of each subnet, and sending an association request, and accessing the first subnet after being allowed;
  • the cluster head node 602 of the first subnet is configured to receive an association request sent by the mobile user, determine, according to the association request, the mobile user to join the subnet, and obtain the signal strength indicator after the mobile user accesses the first subnet.
  • the RSSI and the link quality indicator index LQI value generate ⁇ , obtain the location information of the mobile user according to ⁇ , and predict the mobile user next time position, determine whether the handover process is triggered; if yes, move according to the next time in the prediction information
  • the location information of the user obtains the signal strength and link quality information of the cluster head nodes of each new subnet covering the area, calculates the value of each subnet, selects the second subnet to be added according to the value, and sends an association request. ;
  • the cluster head node 603 of the second subnet is configured to allow the mobile user to access the second subnet according to the association request sent by the cluster head node of the first subnet.
  • the present invention uses the R value weighted by the signal strength indicator index RSSI and the link quality indicator index LQI as the system preset parameter, instead of using the RSSI as the system preset parameter in the conventional sense, the accuracy is
  • the aspect LQI is slightly higher than the RSSI, and the two are indicators indicating different categories. Therefore, using this method can greatly improve the accuracy and avoid mis-switching.
  • the present invention calculates the R values of each subnet and sorts them into registers according to the order from largest to smallest. Then, subnet selection by each R value can effectively balance the network energy and prolong the network life; especially when the selection of the pre-join subnet and the pre-switch subnet fails, the entire pre-join or pre-handover can be quickly restored.
  • the process without having to disconnect the network and then rescan, can greatly reduce scan latency, reduce signaling interactions, and reduce overall system overhead.
  • the present invention adopts the prediction of the geographical position in the pre-handover, and can accurately determine the subnet covering the position of the mobile node at the next moment, thereby greatly reducing the number of scanning subnets;
  • the total handover delay is 90%, so the handover delay can be greatly reduced, and the service with higher real-time requirements can provide better service.
  • the present invention uses a progressive decision criterion for handover decision.
  • the first condition is to determine whether ⁇ is within the system preset threshold area, and after the first condition is reached, the second condition is triggered, and the second condition is judgment. Whether the moving position of the mobile node at the next moment exceeds the coverage of the atomic network, and once the coverage of the atomic network is exceeded, the handover is triggered.
  • All or part of the above technical solutions provided by the embodiments of the present invention may be completed by hardware related to program instructions, and the program may be stored in a readable storage medium, and the storage medium includes: a ROM, a RAM, a magnetic disk or an optical disk. Wait A variety of media that can store program code.

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Abstract

La présente invention porte sur un procédé de commutation rapide basé sur un indicateur d'intensité de signal reçu (RSSI) et un indicateur de qualité de liaisons (LQI) dans un réseau de capteurs sans fil, qui résout principalement les problèmes de faible précision de détermination de commutation et de long retard dans le processus de commutation classique. Le procédé comprend les étapes de mise en œuvre suivantes : 1) adoption d'une valeur R, obtenue par pondération et combinaison du RSSI et du LQI, à titre de paramètre de préréglage de système ; 2) utilisation de la valeur R pour une sélection de sous-réseau, en particulier lorsqu'une pré-addition échoue, un flux de pré-addition est rapidement restauré, de sorte qu'un retard de balayage et des temps d'interaction de signalisation sont réduits ; 3) pré-estimation de positions géographiques lors d'une pré-commutation, et détermination d'un sous-réseau couvrant la position du moment suivant d'un utilisateur mobile, de sorte que des temps de balayage de sous-réseaux et un retard de commutation sont réduits ; et 4) utilisation d'une règle de détermination progressive de manière à éviter une erreur de commutation et un effet ping-pong dans une grande mesure. A l'aide du procédé, la capacité du réseau est efficacement équilibrée, et la durée de vie du réseau est prolongée. Le procédé est approprié pour le domaine des réseaux de capteurs qui a de fortes exigences sur les performances de commutation et est sensible au retard de commutation.
PCT/CN2011/073823 2010-06-18 2011-05-09 Procédé et système de commutation rapide dans un réseau de capteurs sans fil WO2011157087A1 (fr)

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