WO2012065418A1

WO2012065418A1 - Method and system for accessing wireless sensor network

Info

Publication number: WO2012065418A1
Application number: PCT/CN2011/074446
Authority: WO
Inventors: 马景旺
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-19
Filing date: 2011-05-20
Publication date: 2012-05-24
Also published as: CN102469553B; CN102469553A

Abstract

Disclosed in the present invention are a method and system for accessing a Wireless Sensor Network (WSN). The system includes: a WSN and a telecommunication network, wherein a plurality of gateways are configured in the WSN, and the telecommunication network comprises a management platform for the WSN and a network unit; the management platform, which is used for saving the correspondence relationship between WSN terminals in the WSN and the gateways allocated to them; the WSN terminals in the WSN, which are used for accessing the telecommunication network via the allocated gateways; the network unit, which is used for acquiring the information of the gateways allocated to the WSN terminals from the management platform and establishing communication with the WSN terminals by the acquired information of the gateways. The present invention enables the communication between the network unit in the telecommunication network and the WSN terminals in the WSN under the case that multiple gateways are configured in the WSN.

Description

Method and system for accessing wireless sensor network

The present invention relates to the field of communication technologies for wireless sensor networks (WSNs) and telecommunication networks, and more particularly to a method and system for accessing wireless sensor networks. Background technique

As a combination of computing, communication and sensor technologies, WSN is a new information acquisition and processing technology. Improvements in recent microfabrication technologies, communication technologies, and battery technologies have enabled tiny WSN terminals to have the ability to sense, wirelessly communicate and process information. Such WSN terminals can not only sense and detect the objects and changes of the environment, but also process the collected data, and send the processed data to the data collection center by wireless transmission. These WSN terminals typically consist of power supplies, sensing components, embedded processors, memory, communication components, and software. The power supply provides the sensor node with the energy necessary for normal operation; the sensing component is used to sense and acquire external information and convert it into a digital signal; the embedded processor is responsible for coordinating the work of various parts of the node, such as acquiring the sensing component. The information is processed, stored, controlled, and the operating mode of the power supply; the communication component is responsible for communicating with other sensors or observers; the software provides the necessary software support for the sensor node, such as embedded operating system, embedded Database system, etc. With the help of a variety of sensing components built into the WSN terminal, the thermal, infrared, sonar, radar and seismic signals in the surrounding environment are measured to detect temperature, humidity, noise, light intensity, pressure, soil composition, and movement. Many material phenomena such as the size, speed and direction of the object. WSN terminals generally form a network through self-organization or pre-configuration. In terms of communication methods, although various forms such as wired, wireless, infrared, and optical can be used, it is generally considered that short-range wireless low-power communication technology is most suitable for sensor network use. Often referred to as WSN. The current widely used wireless low-power communication technologies include: IEEE, Institute of Electrical and Electronics Engineers 802.15.4 and Zigbee technologies. Among them, Zigbee is similar to Bluetooth and is an emerging short-range wireless technology.

IEEE 802.15.4 is a low-speed wireless personal area network standard developed by IEEE. IEEE 802.15.4 specifies the physical layer and media access control layer standards. The IEEE 802.15.4 compliant communication module features low cost, low power consumption, and small size.

The Zigbee Alliance is an organization dedicated to developing reliable, low-cost, low-power, wireless network connectivity monitoring and control products based on open global standards. The Zigbee standard physical layer and media access control layer use IEEE 802.15.4 technology, and the network layer, security management, application layer specifications, and interoperability are developed by the Zigbee Alliance. The Zigbee smart energy public applications profile and the Zigbee home automation public applications profile in the Zigbee standard are for business environment applications and home applications.

The WSN terminal's micro-processing capabilities and wireless communication capabilities make WSN a promising application, including military applications, biological and environmental monitoring, health applications, home applications, industrial control and monitoring.

The combination of WSN and telecommunication networks, such as 2G mobile communication, 3G mobile communication, digital subscriber loop communication technology (xDSL), optical fiber communication (FTTx), broadband wireless access, satellite/microwave, etc., can make WSN an extension of existing networks. , expanding the ability of the communication network to extend the communication object from person to the physical world, and has a good development prospect. When WSN is combined with the existing telecommunication network, the data sensed by the sensor network can be effectively transmitted to the data center. By sorting and analyzing the data, the way for humans to obtain data in the natural world can be greatly changed. It is able to centrally manage the WSN and solve the problem that the WSNs that are currently scattered everywhere are difficult to manage.

The combination of WSN and telecommunication network refers to connecting WSN with telecommunication network and utilizing telecommunication network. The network monitors, manages and completes the service bearer and cooperation implementation of the WSN and the services it provides, and extends the services provided by the WSN through the telecommunication network. The combination of the WSN and the telecommunications network is generally that the WSN is connected to the telecommunications network platform through the gateway device.

The WSN terminal is a sensor node constituting the WSN and is connected to the gateway by one or more hops. The WSN terminal is responsible for collecting and uploading data, as well as receiving and executing commands. The WSN terminals that make up the WSN are as few as a few hundreds, and WSN terminals can be networked in a star, tree or mesh manner, some of which have strong groups. Network and data forwarding capabilities. In the WSN, the gateway is responsible for transmitting the data reported by the WSN terminal to the relevant network unit in the telecommunication network, and the relevant network unit in the telecommunication network sends the relevant command to the WSN terminal through the gateway. Moreover, when the WSN uses the commonly used IEEE 802.15.4 and Zigbee technologies, the gateway is generally responsible for creating the WSN, which is responsible for the management of the WSN terminal when joining and leaving the sensor network, and the configuration information of the WSN terminal and the sensor network are stored in the gateway. Important data such as business configuration information.

The data reported by the WSN terminal needs to be sent to the relevant network unit in the telecommunication network through the gateway, and the existing WSN usually only configures one gateway for forwarding the data reported by the WSN terminal to the relevant network unit in the telecommunication network, so that When the number of WSN terminals in the WSN is relatively large, or when the WSN terminal frequently reports data, the gateway in the WSN is heavily loaded, causing the data of the WSN terminal not to be sent in time, and the communication between the WSN terminal and the gateway is congested. problem. This will seriously affect the normal operation of the WSN. In addition, when the network unit on the telecommunication network side performs management of the WSN terminal in the wireless sensor network, it is required to establish communication with the WSN terminal through the gateway of the wireless sensor network; if the gateway unit on the telecommunication network side only passes through one gateway and the wireless sensor network The establishment of the communication by the WSN terminal in the network also causes a relatively large bearer pressure on the gateway, which causes the gateway unit on the telecommunication network side to fail to establish communication with the WSN terminal in the wireless sensor network in time, which affects the normal operation of the related service. Therefore, it is necessary to consider how the relevant network element on the telecommunication network side communicates with the WSN terminal in the wireless sensor network. At present, in the scenario of combining WSN and telecommunication network, this problem is addressed. There is no valid solution yet. Summary of the invention

In view of this, the main object of the present invention is to provide a method and system for accessing a wireless sensor network, so as to implement a network unit in a telecommunication network and a WSN terminal in a wireless sensor network in the case where the WSN is configured with multiple gateways. Communication.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The present invention provides an access system for a wireless sensor network (WSN), the system comprising:

a WSN and a telecommunication network, wherein a plurality of gateways are configured in the WSN, and the telecommunication network includes a management platform and a network unit of the WSN,

The management platform is configured to save a correspondence between a WSN terminal in the WSN and a gateway to which it is assigned;

The WSN terminal in the WSN is configured to access the telecommunication network by using the allocated gateway; the network unit is configured to acquire, by the management platform, information about the gateway to which the WSN terminal is allocated, and establish the gateway information obtained by using the acquired gateway information. Communication with the WSN terminal.

Multiple gateways in the WSN use a master-slave mode of operation.

a primary gateway, configured to perform scheduling and allocation of the gateway in the multiple gateways, and allocate, by the WSN terminal, a gateway used when accessing the telecommunication network; the allocated gateway is the primary gateway itself, or any one of the secondary gateways;

The slave gateway is configured to provide telecommunication network access to the WSN terminal according to the scheduling of the primary gateway.

The main gateway is further configured to: when the WSN terminal applies to join the WSN, allocate, to the WSN terminal, a gateway used when accessing the telecommunication network, and send information about the WSN terminal and communication connection configuration information to The assigned gateway sends the information of the assigned gateway and the communication connection configuration information to the WSN terminal; and is further configured to send the correspondence between the WSN terminal and the assigned gateway to the management platform for storage. The management platform is further configured to: when receiving the registration request of the slave gateway, record related information of the slave gateway, and notify the master gateway that a new slave gateway joins the WSN; wherein, the slave gateway The related information includes at least: an identifier of the slave gateway and an address of the slave gateway in the telecommunications network;

Correspondingly, the primary gateway is further configured to: send, to the slave gateway, network configuration parameters required to join the WSN;

The slave gateway is further configured to join the WSN using the obtained network configuration parameters. Multiple gateways in the WSN use a peer-to-peer mode of operation.

The management platform is further configured to allocate a gateway used by the WSN terminal in the WSN to access the telecommunication network.

The network unit is further configured to send, to the management platform, a request for acquiring a gateway to which the WSN terminal is allocated, where at least the identifier of the WSN terminal is included;

Correspondingly, the management platform is further configured to: determine information about the gateway to which the WSN terminal is allocated, and provide the information to the network unit;

The network unit is further configured to establish a communication connection with the gateway according to the obtained information of the gateway, and provide an identifier of the WSN terminal to the allocated gateway, and establish communication with the WSN terminal by the allocated gateway. .

The present invention also provides a method for accessing a wireless sensor network, which is applied to a network architecture combining a WSN and a telecommunication network, and the method includes:

Configuring a plurality of gateways in the WSN, where the management platform in the telecommunication network stores a correspondence between the WSN terminals in the WSN and the gateways to which they are assigned;

The WSN terminal in the WSN accesses the telecommunication network through the allocated gateway, and the network unit acquires information about the gateway allocated by the WSN terminal from the management platform, and establishes with the WSN terminal by using the acquired gateway information. Communication between.

The plurality of gateways in the WSN adopt a master-slave working mode, and the method further includes: The master gateway performs scheduling and allocation of the gateway in the plurality of gateways, and allocates, to the WSN terminal, a gateway used when accessing the telecommunication network; the allocated gateway is the master gateway itself, or any one of the slave gateways;

The slave gateway provides telecommunications network access to the WSN terminal according to the scheduling of the primary gateway. The method further includes: when the WSN terminal applies to join the WSN, the primary gateway allocates a gateway used by the WSN terminal to access the telecommunication network, and sends information about the WSN terminal and communication connection configuration information. And the information about the assigned gateway and the communication connection configuration information are sent to the WSN terminal; and the corresponding relationship between the WSN terminal and the assigned gateway is sent to the management platform for storage.

The method further includes:

The management platform records the related information of the slave gateway when receiving the registration request of the slave gateway, and notifies the master gateway that a new slave gateway joins the WSN; wherein, the related information of the slave gateway includes at least The identifier of the slave gateway and the address of the slave gateway in the telecommunication network; the network configuration parameter that the master gateway needs to join the WSN is sent to the slave gateway;

The network configuration parameters obtained from the gateway usage are added to the WSN.

The plurality of gateways in the WSN adopt a peer-to-peer mode of operation, and the method further includes: the management platform is configured to allocate a gateway used by the WSN terminal in the WSN to access the telecommunication network.

The network unit obtains information about the gateway to which the WSN terminal is allocated from the management platform, and establishes communication with the WSN terminal by using the acquired gateway information, specifically:

Sending, by the network unit, a request for obtaining a gateway to which the WSN terminal is allocated, where the at least the identifier of the WSN terminal is included;

The management platform determines information of the gateway to which the WSN terminal is allocated and provides the information to the network unit; The network unit establishes a communication connection with the gateway according to the obtained information of the gateway, and provides the identifier of the WSN terminal to the assigned gateway, and establishes communication with the WSN terminal through the allocated gateway.

The method and system for accessing a wireless sensor network provided by the present invention, when a WSN and a telecommunication network are combined, a plurality of gateways are configured in one WSN, and a plurality of gateways respectively provide a telecommunication network for the WSN terminals in the WSN. Therefore, the WSN's telecommunication network access capability is improved, and the problem that the data cannot be transmitted in time and the WSN is congested due to the WSN terminal accessing the telecommunication network through a gateway can be effectively solved in the prior art. In addition, the management platform maintains a correspondence between the WSN terminal and its assigned gateway, and the network element in the telecommunication network can establish communication with the WSN terminal through the assigned gateway, such that network element establishment in the telecommunication network and in the wireless sensor network The communication of the WSN terminal can also enable multiple network gateways in the wireless sensor network to enable the network element in the telecommunication network to establish communication with the WSN terminal in time. DRAWINGS

1 is a schematic diagram of a network architecture when multiple gateways exist in a WSN according to an embodiment of the present invention; FIG. 2 is a flowchart of configuring a multi-gateway for a WSN according to an embodiment of the present invention;

3 is a flow chart of allocating a gateway to a WSN terminal when the WSN terminal joins the WSN and uses the working mode of the master and slave gateways according to an embodiment of the present invention;

4 is a flow chart of allocating a gateway for the WSN terminal when the WSN terminal joins the WSN and the WSN multi-gateway uses the peer-to-peer working mode according to the embodiment of the present invention;

FIG. 5 is a flow chart of establishing communication between a service platform and a WSN terminal in a WSN according to an embodiment of the present invention. detailed description

The technical solutions of the present invention are described in detail below with reference to the accompanying drawings and specific embodiments.

The basic idea of the invention is: to configure multiple gateways in one WSN; WSN in WSN The terminal accesses the telecommunication network through the assigned gateway; the management platform in the telecommunication network saves the correspondence between the WSN terminal in the WSN and its assigned gateway, and the network element in the telecommunication network can obtain the WSN node from the management platform. The gateway information is used to establish communication with the WSN terminal through the gateway.

In the multiple gateways of the WSN, the master-slave mode or the peer-to-peer mode can be used. In the master-slave mode, one of the multiple gateways configured by the WSN is one of the gateways and the other gateways are slaves. The primary gateway is used to specify the gateway used by the WSN terminal to access the telecommunication network, and the WSN terminal accesses the telecommunication network through the gateway specified by the primary gateway. It should be noted that the designated gateway may be the primary gateway itself or one of the secondary gateways. The telecommunications network access is provided from the WSN terminal designated by the gateway for the primary gateway.

The primary gateway is responsible for the creation of the WSN, and the gateway is added to the WSN as a routing node in the WSN. When the gateway joins the WSN, it needs to be registered on the management platform. The management platform records related information of the slave gateway, including at least the identifier of the gateway, the address of the slave gateway in the telecommunication network, and the like, and the management platform notifies the WSN. The primary gateway has a new slave to join the WSN. After the gateway joins the WSN, the primary gateway records the information of the slave gateway. The information of the slave gateway may include: an address from the gateway in the WSN, an address of the slave gateway in the telecommunication network, and a telecommunication network access that the slave gateway can provide. Ability and so on. If the address from the gateway in the WSN and the address in the telecommunications network use the same address, then the primary gateway only needs to record the address. Communication between the primary and secondary gateways can be through the WSN or through the telecommunications network.

When the WSN terminal joins the WSN, the primary gateway allocates the gateway used by the access telecommunication network to the WSN terminal according to the relevant rules assigned by the gateway, and the allocated gateway may be the primary gateway or the secondary gateway. The primary gateway can determine the gateway used by the WSN node to access the telecommunication network according to the topology of the network, the load balancing between the gateways, and the length of the route from the WSN node to the gateway. When the gateway is allocated, the primary gateway provides the information of the assigned gateway (such as the address of the gateway in the WSN) to the WSN terminal, and the WSN terminal saves the information of the assigned gateway and creates a gateway to the gateway. Routing information; The primary gateway provides the information of the WSN terminal (including the identifier of the WSN terminal, the address of the WSN terminal in the WSN) to the assigned gateway, and the assigned gateway records the information of the WSN terminal.

The primary gateway saves the correspondence between the WSN terminal in the WSN and its assigned gateway, and sends the information of the corresponding relationship to the management platform, and the management platform saves the information of the corresponding relationship. The correspondence may be implemented in the form of a correspondence table in which the identity of the WSN terminal and the identity of the gateway to which it is assigned are recorded. The corresponding relationship can be used to query the gateway used by a WSN terminal to access the telecommunication network, and a gateway in the WSN provides telecommunication network access for which WSN terminals in the WSN.

In addition, after the WSN terminal joins the WSN, the primary gateway can change the gateway used by the WSN terminal to access the telecommunication network. The newly designated gateway of the primary gateway provides the TSN terminal with telecommunication network access, and the original gateway no longer provides telecommunication network access for the WSN terminal.

When the WSN terminal leaves the WSN, the gateway used by the primary gateway and the WSN terminal to access the telecommunication network can clear the information of the WSN terminal saved by the WSN terminal. After the WSN terminal leaves the WSN, the gateway corresponding to the WSN terminal is no longer The WSN terminal provides telecommunications network access.

In the peer-to-peer mode of operation, the WSN terminal in the WSN is assigned by the management platform to the gateway used to access the telecommunications network. Among the multiple gateways configured by the WSN, a WSN can be created by one gateway, and the remaining gateways are added to the WSN as routing nodes in the WSN. The management platform saves the information of the gateway in the WSN, including the identifier of the gateway, the address of the gateway in the telecommunication network, the address of the gateway in the WSN, and the access capability of the gateway's telecommunication network.

Before the WSN terminal joins the WSN, the management platform may write the network configuration parameters required for joining the WSN in the WSN terminal through the client or other manner, and the network configuration parameter may be created by the management platform from the WSN to which the WSN terminal applies for joining. Obtained at the gateway of the WSN. When the WSN terminal joins the WSN, it proposes to join the WSN to the gateway that creates the WSN. The request includes information such as the identifier of the WSN terminal, and the gateway that creates the WSN can send the information of the WSN terminal to the management platform. After receiving the information of the WSN terminal sent by the gateway that creates the WSN, the management platform allocates a gateway to the WSN terminal according to the relevant rules allocated by the gateway. The management platform may send the information of the assigned gateway to the gateway that creates the WSN, and the gateway information that creates the WSN sends the allocated gateway information (such as the address of the gateway in the WSN) to the WSN terminal; the WSN terminal saves the information of the allocated gateway. And create routing information to the gateway. The management platform sends the information of the WSN terminal (including the identifier of the WSN terminal and the address of the WSN terminal in the WSN) to the allocated gateway through the communication connection of the telecommunication network, and the allocated gateway records the information of the WSN terminal; The management platform may also instruct the gateway that creates the WSN to transmit the information of the WSN terminal (including the identifier of the WSN terminal, the address of the WSN terminal in the WSN) to the assigned gateway through the communication connection in the WSN.

In the peer-to-peer mode, the management platform saves the correspondence between the WSN terminal in the WSN and the assigned gateway, and the correspondence may be implemented in the form of a correspondence table in which the identifier of the WSN terminal and its assigned The identity of the gateway. Through the corresponding relationship, the management platform can query the gateway used by a WSN terminal to access the telecommunication network, and a gateway in the WSN provides telecommunication network access for which WSN terminals in the WSN.

After the WSN terminal in the WSN is allocated to access the gateway used by the telecommunication network in the above two manners, the management platform stores the corresponding relationship between the WSN terminal in the WSN and the assigned gateway. If a network element (such as a service platform) in the telecommunication network is ready to establish communication with the WSN terminal in the WSN, the network element in the telecommunication network can obtain information (such as a gateway) of the gateway used by the WSN terminal to access the telecommunication network from the management platform. The address, identity), and then establish communication with the WSN terminal through the gateway.

Based on the above idea, the present invention also provides a network architecture combining a WSN and a telecommunication network, wherein the WSN is composed of a WSN terminal and a gateway (multiple), and the WSN terminal is connected to the telecommunication network through the respective assigned gateway, and the telecommunication Management platforms and other network elements in the network (eg Business platform), etc. establish communication. The management platform is configured to save a correspondence between the WSN terminal in the WSN and the gateway to which it is assigned. The WSN terminal in the WSN is used to access the telecommunication network through the allocated gateway. a network unit, configured to obtain information about a gateway to which the WSN terminal is allocated from the management platform, and establish communication with the WSN terminal by using the acquired gateway information; specifically: the network unit sends, to the management platform, the gateway that is allocated by the WSN terminal. a request, where at least the identifier of the WSN terminal is included; the management platform determines information of the gateway to which the WSN terminal is allocated and provides the information to the network unit; the network unit establishes a communication connection with the gateway according to the obtained information of the gateway, and provides the identifier of the WSN terminal to the The assigned gateway establishes communication with the WSN terminal through the assigned gateway.

Further, multiple gateways in the WSN can use the master-slave working mode, and the primary gateway performs scheduling and allocation of gateways in multiple gateways, and allocates gateways for accessing the telecommunication network to the WSN terminals; The gateway itself, or any one of the slave gateways; the slave gateway provides telecommunications network access for the WSN terminal according to the scheduling of the master gateway.

Further, multiple gateways in the WSN can also use the peer-to-peer mode of operation, and the management platform allocates a gateway for accessing the telecommunication network to the WSN terminal in the WSN.

In summary, the method and system provided by the present invention can configure multiple gateways in one WSN, and multiple gateways provide telecommunication network access for WSN terminals in the WSN, thereby improving the access capability of the WSN to the telecommunication network. The problem that the wireless sensor network congestion exists when the WSN terminal accesses the telecommunication network can be effectively solved. In addition, the management platform saves the correspondence between the WSN terminal and its assigned gateway, and the network unit in the telecommunication network can establish communication with the WSN terminal through the assigned gateway, such that network element establishment in the telecommunication network and in the wireless sensor network The communication of the WSN terminal can also enable multiple network gateways in the wireless sensor network to enable the network element in the telecommunication network to establish communication with the WSN terminal in time.

The access method and system of the foregoing WSN are further described in detail below in conjunction with specific embodiments.

System embodiment: The WSN is a wireless network composed of a group of wireless sensor node devices, such as WSN terminals, in a self-organizing manner; WSN terminals communicate with short-range wireless communication technologies. WSNs are typically deployed in areas ranging from a few meters to a few hundred meters, where WSN terminals are typically battery powered, with lower power consumption and cost. Near field communication technology generally uses Zigbee and IEEE 802.15.4 technology.

The combination of WSN and telecommunication network refers to connecting the WSN with the telecommunication network, using the telecommunication network to monitor, manage and complete the service bearer and cooperation implementation of the WSN and the services it provides, and extend the services provided by the WSN through the telecommunication network. The telecommunication network includes various communication networks such as mobile communication networks, xDSL, FTTx, and satellite communications.

In this embodiment, when the WSN is combined with the telecommunication network, the system architecture diagram of multiple WSN terminals in the WSN accessing the telecommunication network through multiple gateways is shown in FIG. 1 , and the shaded portion filled with cross lines in FIG. 1 indicates For multiple WSN terminals, the shaded portion of the dot padding indicates the area in which multiple WSN terminals are located. The system architecture of Figure 1 is described in detail below.

In Figure 1, the WSN is composed of multiple WSN terminals and multiple gateways. Multiple WSN terminals and multiple gateways can form a wireless sensor network according to the relevant technical standards of the WSN. The short-range communication technologies that can be used to form the WSN include Zigbee technology and IEEE. 802.15.4 standard, etc. The WSN is connected to the telecommunication network through a plurality of gateways, and establishes communication with the management platform of the WSN in the telecommunication network. Among them, the working mode and the peer working mode of the master-slave gateway can be used between multiple gateways.

In order to realize the connection between the WSN and the telecommunication network, the WSN accesses the telecommunication network through multiple gateways, and is connected to the access network, the core network, the service platform, and the management platform of the WSN via the telecommunication network. The WSN terminal is connected to the telecommunications network through a plurality of gateways. The WSN terminal is a sensor node constituting the WSN and is connected to the gateway by one or more hops. The WSN terminal is responsible for collecting and uploading data, as well as receiving and executing commands. The number of WSN terminals that make up the WSN is as few as a few hundreds. WSN terminals can be networked in a star, tree or mesh manner according to their needs. Some WSN terminals have strong networking and Data forwarding capability.

The gateway is responsible for connecting the WSN and the telecommunications network, mainly to complete protocol conversion, address mapping and data. For functions such as forwarding, it is also possible to integrate functions such as security and billing. The functions supported by the gateway may include: Supporting data collaboration and aggregation within the sensor network; Supporting one or more of long-distance communication access methods such as 2G mobile communication, 3G mobile communication, xDSL, FTTx, broadband wireless access, satellite/microwave, etc. , the aggregated data is transmitted to the communication peer; the service platform and the remote management server support the device authentication and user authentication of the gateway; the service platform and the remote management server support the parameters and software configuration of the gateway; support user authentication and service security, Device management security mechanism.

The service platform is a functional entity that operates and manages the services combined with the WSN in the telecommunication network. It is responsible for integrating the services provided by the various service providers and providing them to the end users, and managing the use of the services by the terminal users. The service platform cooperates with other functional entities in the telecommunication network to complete the entire business process according to the needs of different services, such as AAA, Authentication Authorization and Accounting (AAA). The business platform can also be connected to a remote server to update the business directly.

The management platform of the WSN is an entity that implements a management function for the WSN. The management platform may be composed of a management server, and the management server implements a management function for the WSN through the telecommunication network.

Method embodiment:

The first embodiment of the method of the present invention describes the process of configuring a multi-gateway by the WSN. Specifically, the WSN is first created by a gateway. After the WSN is created, the WSN information (such as the network identifier of the WSN) is sent to the WSN. The management platform, the management platform saves the WSN and the information of the gateway.

The other gateways can be added to the WSN as routing nodes in the WSN. The specific process is as shown in Figure 2, including the following steps:

Step 201: The other gateway (that is, the gateway other than the gateway that creates the WSN, also called the new gateway) registers with the management platform through the communication connection provided by the telecommunication network.

Here, after the new gateway is installed in the WSN area to be joined, the new gateway can establish a communication connection with the management platform through the telecommunication network, and send a registration request to the management platform. Management platform can pass The identity of the new gateway is authenticated to determine the authenticity of the identity of the new gateway. The information of the new gateway is pre-stored in the management platform, and the information includes the network access capability parameter of the new gateway, the location of the installation, and the like.

Step 202: The management platform notifies the WSN of the gateway responsible for the WSN to be created, and a new gateway applies to join the WSN.

Here, the management platform determines the WSN that the new gateway is ready to join according to the location where the new gateway is to be installed, and then notifies the gateway that created the WSN that a new gateway applies to join the WSN. The management platform can simultaneously send the information of the new gateway to the gateway that creates the WSN. The information of the new gateway may include: an address of the new gateway in the telecommunication network, a network access capability parameter, and the like.

Step 203: The gateway that creates the WSN sends the network configuration parameters required to join the WSN to the registered new gateway.

Here, the gateway that creates the WSN sends the new network gateway to the management platform for the network configuration parameters required by the WSN, and then the management platform sends the network configuration parameter and the address of the gateway that creates the WSN in the telecommunication network to the new gateway. . The network configuration parameters here include the address of the WSN's gateway in the WSN, the initial master key, and so on.

Step 204: The new gateway joins the WSN by using the obtained network configuration parameters.

Here, after obtaining the network configuration parameter of the WSN, the new gateway performs channel scanning in the coverage area of the WSN, and then sends an association request (Association Request) frame to the gateway that creates the WSN, requesting to join the WSN. The new gateway and the gateway that creates the WSN negotiate according to the initial master key to determine a network key, a link key, an address, and the like. The new gateway records the address and associated routing information in the WSN, and the gateway that creates the WSN records the address of the new gateway in the WSN and the information of the new gateway.

After the gateway joins the WSN, the gateway can communicate and exchange related data through the WSN. The address of the gateway in the telecommunication network can use the IP address. Since the IP address of the other party in the telecommunication network is stored between the gateways, the two parties can also communicate through the telecommunication network. Through the foregoing embodiment 1, multiple gateways can be configured in the WSN.

In the Zigbee network, in order to enable the WSN terminal to join the WSN, the WSN terminal needs to obtain the network configuration parameters required to join the WSN from the management platform of the WSN. The network configuration parameters include: the initial master key of the WSN to be joined and the creation of the WSN. The address of the gateway. When the WSN terminal joins the WSN, the authenticity of the initial master key of the WSN terminal of the WSN is established, thereby verifying the identity of the WSN terminal. If the initial master key of the WSN terminal is correct, the WSN terminal is allowed to join the WSN, and the WSN terminal and the gateway that creates the WSN can negotiate based on the initial master key to determine the link key required to join the WSN. The network key and address, etc., thereby enabling the WSN terminal to successfully join the WSN. When a WSN terminal that does not have the network configuration parameter applies to join the WSN, because the initial master key cannot be provided or the initial master key is not the correct key, the gateway that creates the WSN rejects the WSN terminal to join the WSN.

Here, when the WSN terminal manufacturer produces the WSN terminal, the network configuration parameter of the WSN is not written in the WSN terminal, and the WSN terminal can write the WSN terminal through the client or other means before the WSN terminal is put into use. The network configuration parameters of the WSN to be joined. The management platform can obtain the network configuration parameters required to join the WSN from the gateway that creates the WSN.

It should be noted that the WSN management platform can obtain the WSN network configuration parameters in two ways. The first mode is: the management platform sends a request for acquiring the WSN network configuration parameter to the gateway that creates the WSN, and the gateway that creates the WSN provides the network configuration parameters required by the WSN terminal to join the WSN. The second mode is as follows: After the WSN is created, the gateway that creates the WSN will join the network configuration parameters required by the WSN and provide it to the WSN management platform and save it on the WSN management platform.

Embodiment 2 of the method of the present invention describes a process of assigning a gateway to a WSN terminal when the WSN terminal joins the WSN and uses the working mode of the master and slave gateways in the WSN formed by the Zigbee technology. In this process, the primary gateway is the gateway that creates the WSN. As shown in Figure 3, specific The process includes the following steps:

Step 301: Write, in the WSN terminal, a network configuration parameter of the WSN to which the WSN terminal applies for joining.

Step 302: The WSN terminal applies to the WSN by using the network configuration parameter of the WSN, and the primary gateway verifies the WSN terminal. If the verification succeeds, step 303 is performed; if the verification fails, step 304 is performed.

In this step, the WSN terminal is placed in the area covered by the WSN to be joined. After the WSN terminal is powered on, the WSN terminal can perform network scanning on the set channel to determine the WSN to be added. The network scan can send a Beacon Request frame on the channel. After the device in the WSN on the channel receives the Beacon Request, if a new WSN terminal is allowed to join the WSN, it will respond to the Beacon frame. The Beacon frame contains the address information of the WSN terminal that sent the frame, and whether other WSN terminals are allowed to join in the manner of their child nodes. The WSN terminal saves the information of the received Beacon frame in its own neighbor table.

Here, the WSN terminal selects an appropriate parent node in the association table, and sends an Association Request frame request to the parent node to join the WSN. After receiving the request to join the WSN, the WSN terminal at the parent node of the WSN notifies the WSN of the primary gateway that a new WSN terminal requests to join the WSN.

The WSN's primary gateway authenticates the WSN terminal. The authentication method can be based on the method in which the node device joins the network in the Zigbee specification. The primary gateway determines the authenticity of the initial master key in the WSN terminal. If the WSN terminal passes the verification, the operation of step 303 is performed; if the WSN terminal fails to verify, the operation of step 304 is performed.

Step 303: After the WSN terminal passes the verification, the communication protocol negotiates with the primary gateway to determine the link key and the network key, and the primary gateway adds the information of the WSN terminal in the node management table, and the parent node device of the WSN terminal is in its neighbor table. Saving the information of the WSN terminal, the WSN terminal is The information of the parent node and the master gateway is saved in its own neighbor table. At this point, the WSN terminal successfully joined the WSN.

Step 304: The WSN terminal fails to pass the authentication, and the primary gateway rejects the WSN terminal to join the WSN. Step 305: The primary gateway specifies the gateway used by the WSN terminal to access the telecommunication network. Here, the primary gateway determines the WSN according to the relevant principle of the gateway allocation. The terminal accesses the gateway used by the telecommunication network. The main gateway may send the information and communication connection configuration information of the WSN terminal to the allocated gateway, and the main gateway sends the information of the allocated gateway and the communication connection configuration information to the WSN terminal.

The communication connection configuration information is a link key required for establishing a communication connection between the designated gateway and the WSN terminal, and the designated gateway and the WSN terminal establish a secure communication connection through the link key.

Step 306: The WSN master gateway notifies the WSN management platform that the WSN terminal has joined the WSN, and sends the correspondence between the WSN terminal and its assigned gateway to the management platform.

In this step, the management platform saves related information of the WSN terminal, including the identifier of the WSN terminal, the correspondence between the WSN terminal and the WSN to which the WSN terminal belongs, and the correspondence between the WSN terminal and the gateway to which it is assigned. The management platform also associates the WSN terminal. The information is sent to the service platform, and the service platform configures related data of the WSN terminal, and enables the services supported by the WSN terminal.

It can be seen that, through the above process, the WSN terminal writes the network configuration parameter and joins the designated WSN, and the WSN's main gateway specifies the gateway used by the WSN terminal to access the telecommunication network, so that the WSN terminal can report to the service platform through the gateway. data.

It should be noted that, in order to record information such as a gateway used by the WSN terminal in the WSN to access the telecommunication network, the main gateway stores the corresponding relationship between the WSN terminal in the WSN and the assigned gateway.

After the WSN terminal joins the WSN, there may be a situation in which the gateway used by the WSN terminal to access the telecommunication network needs to be changed. For example: The primary gateway may select another WSN terminal for one WSN terminal. The slave gateway closer to the WSN terminal reduces the routing path between the WSN terminal and the slave gateway, thereby reducing the communication complexity and energy saving effect in the WSN. At this time, the main gateway may specify a new gateway for the WSN terminal to provide the telecommunication network access, and the main gateway may send the information and communication connection configuration information of the WSN terminal to the newly designated gateway, and notify the gateway change message that the The WSN terminal provides a gateway for telecommunications network access. The newly designated gateway adds the configuration information of the WSN terminal to the gateway, and the original gateway deletes the telecommunication network access configuration information of the WSN terminal stored in the gateway. The newly designated gateway provides telecommunication network access for the WSN terminal, and the original gateway no longer provides telecommunication network access for the WSN terminal.

When the terminal that joins the WSN leaves the WSN, the gateway used by the primary gateway and the WSN terminal to access the telecommunication network can clear the telecommunication network access configuration information of the WSN terminal that is saved, the gateway corresponding to the main gateway and the WSN terminal, The WSN terminal is no longer provided with telecommunication network access after leaving the WSN.

The third embodiment of the method of the present invention describes the process of allocating a gateway to the WSN terminal when the WSN terminal joins the WSN and the WSN multi-gateway uses the peer-to-peer mode in the WSN formed by the Zigbee technology. In this process, the management platform assigns the WSN terminal the gateway used to access the telecommunications network. As shown in Figure 4, the specific process includes the following steps:

Step 401: Write, in the WSN terminal, a network configuration parameter of the WSN to which the WSN terminal applies for joining.

Step 402: The WSN terminal uses the network configuration parameter of the WSN to apply to join the WSN, and the gateway that creates the WSN authenticates the WSN terminal. If the verification succeeds, step 403 is performed; if the verification fails, step 404 is performed.

In this step, the WSN terminal is placed in the area covered by the WSN to be joined. After the WSN terminal is powered on, the WSN terminal can perform network scanning on the set channel to determine the WSN to join. The network scan can send a Beacon Request frame on the channel. After the device in the WSN on the channel receives the Beacon Request, if a new one is allowed. The WSN terminal joins the WSN and will respond to the Beacon frame. The Beacon frame contains the address information of the WSN terminal that sent the frame, and whether other WSN terminals are allowed to join in the manner of its child nodes. The WSN terminal saves the information of the received Beacon frame in its own association table.

Here, the WSN terminal selects an appropriate parent node in the association table, and sends an Association Request frame request to the parent node to join the WSN. After receiving the request to join the WSN, the WSN terminal at the parent node of the WSN notifies the gateway that creates the WSN that a new WSN terminal requests to join the WSN.

The gateway that creates the WSN authenticates the WSN terminal. The authentication method can be used to determine the authenticity of the initial master key in the WSN terminal according to the method in which the node device joins the network in the Zigbee specification. If the WSN terminal passes the verification, the operation of step 403 is performed; if the WSN terminal verification fails, the operation of step 404 is performed.

Step 403: After the WSN terminal passes the verification, perform communication negotiation with the gateway that creates the WSN to determine the link key and the network key, and the gateway that creates the WSN adds the information of the WSN terminal in the node management table, and the parent node device of the WSN terminal is in itself. The neighboring table holds the information of the WSN terminal, and the WSN terminal stores the information of the parent node and the gateway that creates the WSN in its own neighbor table. At this point, the WSN terminal successfully joins the WSN.

Step 404: The WSN terminal fails to pass the authentication, and the gateway that creates the WSN rejects the WSN terminal to join the WSN.

Step 405: After the WSN terminal joins the WSN, the gateway that creates the WSN sends the information of the WSN terminal to the management platform.

Step 406: The management platform specifies, for the WSN terminal, a gateway used to access the telecommunication network. In this step, the management platform saves the information of the WSN terminal, and determines the gateway used by the WSN terminal to access the telecommunication network according to the relevant principle of the gateway allocation. The management platform may send the information of the assigned gateway to the gateway that creates the WSN, and the gateway sends the allocated gateway information (such as the address of the gateway in the WSN) to the WSN terminal; the WSN terminal saves the allocated gateway. Information, and create routing information to the gateway. The management platform sends the information of the WSN terminal (the identifier of the WSN terminal, the address of the WSN terminal in the WSN) to the assigned gateway through the communication connection of the telecommunication network, and the allocated gateway records the information of the WSN terminal.

The management platform saves the correspondence between the WSN terminal and its assigned gateway.

Step 407: Create a gateway of the WSN to notify the management platform of the WSN that the WSN terminal has joined the WSN.

Step 408: The management platform sends the information of the WSN terminal to the service platform, and the service platform configures related data of the WSN terminal, and enables the service supported by the WSN terminal.

After the WSN terminal joins the WSN, the management platform saves the correspondence between the WSN terminal in the WSN and its assigned gateway. The network element in the telecommunication network can obtain the WSN terminal access telecommunications from the management platform. Information about the gateway used by the network.

The fourth embodiment of the method of the present invention describes a process of establishing communication between a service platform in a telecommunication network and a WSN terminal in the WSN. As shown in FIG. 5, the method includes the following steps:

Step 501: The service platform sends a request to the management platform to obtain a gateway to which the WSN terminal is allocated.

The request information sent by the service platform to the management platform includes at least the identifier of the WSN terminal. Step 502: The management platform determines information of the gateway to which the WSN terminal is allocated and provides the information to the service platform.

The management platform searches for the corresponding relationship between the WSN terminal and the gateway to which it is assigned according to the identifier of the WSN terminal, obtains the identifier of the gateway to which the WSN terminal is assigned, and then performs the information of the gateway saved by the management platform according to the identifier of the gateway. Query, obtain information such as the address of the gateway in the telecommunication network. The management platform sends the information of the obtained gateway to the service platform.

Step 503: The service platform establishes a communication connection with the gateway according to the obtained information of the gateway. In this step, the service platform establishes communication with the corresponding gateway according to the address of the gateway in the telecommunication network. Step 504: The service platform provides the identifier of the WSN terminal to the gateway, and establishes communication with the WSN terminal through the gateway.

In this step, the service platform provides the identifier of the WSN terminal that is ready to establish communication to the gateway, and the gateway queries the information of the WSN terminal that it saves, obtains the address of the WSN terminal, and establishes communication with the WSN terminal; The communication terminal establishes communication with the service terminal, and the gateway forwards the data communicated between the WSN terminal and the service platform.

Through the above process, the service platform can actively initiate and establish communication with the WSN terminal, and other network elements in the telecommunication network (except the service platform and the management platform) can also use the above process to establish communication with the WSN terminal.

When the management platform actively establishes communication with the WSN terminal, the management platform may query the correspondence between the WSN terminal and the assigned gateway of the WSN terminal by using the identifier of the WSN terminal, and obtain information of the corresponding gateway; and then establish with the gateway. Communication, and providing the identifier of the WSN terminal to the gateway; the gateway finds the corresponding WSN terminal and establishes communication with the WSN terminal; the management platform and the WSN terminal communicate through the gateway.

The following is the following related content related to the establishment of WSN and management of WSN through Zigbee technology.

ZigBee is an emerging short-range, low-rate, low-cost, low-power wireless network technology. It uses Direct Sequence Spread Spectrum (DSSS) technology and operates at 868MHz, 915MHz or 2.4GHz. There are three types of nodes in the ZigBee network: ZigBee coordination point, ZigBee routing node and ZigBee terminal node.

Among them, the ZigBee coordination point is also called a personal area network (PAN) coordination point (ZC, ZigBee Coordinator) in IEEE 802.15.4, and can be used as a sink node in the WSN. The ZigBee coordination point must be a Full-Function Device (FFD). A ZigBee network has only one ZigBee coordination point. It is often more powerful than other nodes in the network and is the master node of the entire network. It is responsible for initiating the establishment of a new network, setting up network parameters. The number, the nodes in the management network, and the node information in the storage network can also perform the functions of the router after the network is formed.

The ZigBee Routing Node (ZR, ZigBee Router) must also be a fully functional device. ZigBee routing nodes can participate in route discovery, message forwarding, and extend the coverage of the network by connecting other nodes. In addition, the ZigBee routing node can also act as a common coordination point in its Personal Operating Space (POS), and IEEE 802.15.4 is called a coordination point. The normal coordination point is different from the ZigBee coordination point, which is still controlled by the ZigBee coordination point.

The ZigBee EndNode (ZE, ZigBee EndDevice) can be a full-featured device or a Reduced-Function Device (RFD), which connects to the network through ZigBee co-nodes or ZigBee routing nodes, but does not allow any other node to join through it. Network, ZigBee endpoints can operate at very low power.

In the present invention, the primary gateway (or the gateway responsible for the WSN) acts as a Zigbee coordination point in the Zigbee network and is responsible for the formation of the WSN. The WSN terminal can join the WSN as a Zigbee routing node or a Zigbee endpoint; the gateway (or other gateway except the one that creates the WSN) joins the WSN as a Zigbee routing node. Gateways and WSN terminals need to support Zigbee communication technology.

In addition, in order to realize the security of the Zigbee network, it is necessary to encrypt the communication in the WSN, and the encryption operation in the Zigbee network, using the Advanced Encryption Standard (AES) algorithm, and the symmetric key length used is 128 bits. The keys used in the Zigbee network mainly include: a master key, a link key, and a network key. The master key is a shared key used in the process of performing a symmetric key establishment protocol, and is a long-term security basis between two devices, and can be used to generate a link key; the link key is in a PAN network, A key shared between two devices for secure communication between two devices; a network key is a shared key in a PAN network for the security of broadcast communication. In order to realize the security and key management of the Zigbee network, there is a trust center in the Zigbee network. A trust center is a type of trusted device that distributes security keys across the network. It allows devices to join the network and assign keys, thus ensuring end-to-end security between devices. In a network that uses security mechanisms, the network coordinator can become a trust center. The Trust Center provides the following three features:

(1) Trust Management: The task is responsible for verifying the device joining the network.

(2) Network Management: The task is to obtain and assign network keys to the device.

(3) Configuration management: The task is to bind the application to the device it manages, and achieve end-to-end secure transmission between the two devices.

In order to implement trust management, the device needs to receive the initial master key from the trust center. For network management purposes, the device should receive the initial network key and can only obtain updates to the network key from the Trust Center. In order to implement network configuration, the device needs to receive a master key or a link key from the trust center to establish an end-to-end secure link between the two devices.

In addition to the initial master key, the additional link key, master key, and network key can only be obtained from the trust center in a secure manner. The trust center should periodically update the network key according to a policy and pass the new network key to each device.

In the present invention, the primary gateway acts as a trust center for network security management. The identity authentication and secure communication of the gateway can be implemented between the management platform and other network elements in the gateway and the telecommunication network through the identity of the gateway.

In the present invention, a WSN is identified by the network identifier of the WSN. After the gateway creates the WSN, the network identifier of the WSN may be determined by the gateway or by the management platform, and the information about the network identifier and the network location of the WSN is recorded in the management platform. Thus, the management platform can determine whether the location has a WSN managed by the management platform according to a given location, and if there is a WSN, the identity of the WSN at the location can be obtained, thereby determining the WSN at the location.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

An access system for a wireless sensor network (WSN), the system comprising: a WSN and a telecommunication network, wherein: a plurality of gateways are configured in the WSN, and the telecommunication network includes a WSN management platform and Network unit,

2. The access system of the wireless sensor network according to claim 1, wherein a plurality of gateways in the WSN use a master-slave working mode.

The access system of the wireless sensor network according to claim 2, wherein the primary gateway is further configured to: when the WSN terminal applies to join the WSN, allocate the access to the telecommunication network to the WSN terminal. The gateway used by the gateway transmits the information of the WSN terminal and the communication connection configuration information to the assigned gateway, and sends the information of the assigned gateway and the communication connection configuration information to the WSN terminal; The correspondence between the WSN terminal and its assigned gateway is sent to the management platform for storage.

The access system of the wireless sensor network according to claim 2 or 3, wherein the management platform is further configured to: when receiving the registration request of the slave gateway, record related information of the slave gateway And notifying the primary gateway that a new slave gateway joins the WSN; The related information of the slave gateway includes at least: an identifier of the slave gateway and an address of the slave gateway in the telecommunications network;

The slave gateway is further configured to join the WSN using the obtained network configuration parameters.

5. The access system of a wireless sensor network according to claim 1, wherein a plurality of gateways in the WSN use a peer-to-peer mode of operation.

The access system of the wireless sensor network according to claim 1, 2, 3 or 5, wherein the network unit is further configured to send, to the management platform, a request for acquiring a gateway to which the WSN terminal is allocated, Wherein at least the identifier of the WSN terminal is included;

7. A method for accessing a wireless sensor network, which is applied to a network architecture combining a WSN and a telecommunication network, wherein the method comprises:

8. The method for accessing a wireless sensor network according to claim 7, wherein: The plurality of gateways in the WSN adopt a master-slave working mode, and the method further includes: the master gateway performing scheduling and allocation of the gateway in the multiple gateways, and allocating a gateway used by the WSN terminal to access the telecommunication network; The assigned gateway is the master gateway itself, or any one of the slave gateways;

The slave gateway provides telecommunications network access to the WSN terminal according to the scheduling of the primary gateway.

The method for accessing a wireless sensor network according to claim 8, wherein the method further comprises: when the WSN terminal applies to join the WSN, the primary gateway allocates access to the telecommunications for the WSN terminal. a gateway used by the network, transmitting information and communication connection configuration information of the WSN terminal to the allocated gateway, and transmitting information of the allocated gateway and communication connection configuration information to the WSN terminal; The correspondence between the terminal and its assigned gateway is sent to the management platform for storage.

The method for accessing a wireless sensor network according to claim 8 or 9, wherein the method further comprises:

The method for accessing a wireless sensor network according to claim 7, wherein the plurality of gateways in the WSN use a peer-to-peer mode of operation, the method further comprising:

The management platform allocates a gateway for accessing the telecommunication network to the WSN terminal in the WSN.

The method for accessing a wireless sensor network according to claim 7, 8, 9 or 11, wherein the network unit acquires information of a gateway to which the WSN terminal is allocated from the management platform, And establishing, by the obtained gateway information, the communication with the WSN terminal, where: the network unit sends, to the management platform, a request for acquiring a gateway to which the WSN terminal is allocated, where at least the identifier of the WSN terminal is included;

The management platform determines information of the gateway to which the WSN terminal is allocated and provides the information to the network unit;

And the network unit establishes a communication connection with the gateway according to the obtained information of the gateway, and provides the identifier of the WSN terminal to the allocated gateway, and establishes communication with the WSN terminal by the allocated gateway.