KR20120049430A - Apparatus and method for domain master assignment - Google Patents

Abstract

PURPOSE: A domain master allocation method and an apparatus thereof are provided to perform a communication function of a secondary domain master. CONSTITUTION: In case a node 1 accesses a domain master, the domain master allocates a secondary domain master resource to a node 1(610,615). In case the domain master is in an off state, a global master transmits domain master change information to a node 2 by using a DMB field. The node 1 performs a domain master operation.

Description

APPARATUS AND METHOD FOR DOMAIN MASTER ASSIGNMENT {APPARATUS AND METHOD FOR DOMAIN MASTER ASSIGNMENT}

The present invention relates to a grid network communication environment, and more particularly, to an apparatus and method for domain master assignment for controlling nodes in a grid network communication environment.

In general, a grid is an Internet network structure that behaves like a neural tissue, unlike a web that can be connected to only one place at a time. Grid networks serve to communicate geographically dispersed device resources across networks. Thus, in a grid network, it is possible to integrate heterogeneous grid resources as if using one high performance resource. Such a grid network typically includes a number of geographically dispersed electronic devices, often referred to as nodes, which are connected to each other by one or more links. Nodes can communicate through a wired communication environment such as power line communication, coaxial cable communication, and telephone line communication, which are grid network communication environments, and a wireless communication environment.

In such a grid network, information on distributed nodes is managed and serviced by a device in a master role. Such a grid network is also called a domain, and there may be a plurality of such domains.

In the grid network communication environment as described above, when attempting to use a node belonging to a specific domain, if the communication function cannot be performed due to an error in the device acting as a domain master, the node information of the domain becomes unavailable. . Therefore, in the grid network communication environment, the domain master role is very important in that it can control nodes belonging to a specific domain at the same time. Allocation is also very important.

Accordingly, the present invention provides a master assignment apparatus and method to replace the domain master role when a situation in which a communication function does not occur in a device of a domain master role controlling nodes belonging to a domain.

In addition, the present invention provides an apparatus and method for setting a secondary domain master in place of the domain master role among the nodes belonging to the domain.

According to an aspect of the present invention, there is provided a method for assigning a domain master in a domain consisting of a plurality of nodes, wherein any one of the nodes connecting to the domain master controlling nodes belonging to the domain is connected to the domain. And setting the second domain master to take the role of the master, and delegating the role of the domain master to the set second domain master when the domain master is turned off.

The present invention also provides an apparatus for assigning a domain master in a domain consisting of a plurality of nodes, wherein any one of the nodes connecting to the domain master controlling nodes belonging to the domain replaces the role of the domain master. A controller configured to set the secondary domain master to be the second domain master, and report the secondary domain master configuration to a global master controlling the domain master to delegate the role of the domain master to the set secondary domain master in an off state; And a transceiver configured to communicate with nodes belonging to the domain.

The present invention has the advantage that the secondary domain master set when the domain master that controls the nodes belonging to the domain in the grid network communication environment can not perform the communication function by performing the continuous communication function.

1 is a configuration diagram of a grid network system including nodes belonging to a domain and a domain master used in the present invention;
2 is an internal block diagram of a domain master controlling nodes belonging to a specific domain according to an embodiment of the present invention;
3 is a diagram illustrating a domain in a state in which the domain master is turned off according to an embodiment of the present invention;
4 is a domain diagram illustrating a method of setting a secondary domain master according to an embodiment of the present invention;
5 is a view showing an example of a transmission frame according to an embodiment of the present invention,
6 is a flowchart illustrating a second domain master configuration process according to an embodiment of the present invention;
7 is a flowchart illustrating a second domain master configuration process according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and an operation method of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific matters such as specific elements are shown, which are provided to help a more general understanding of the present invention. It is self-evident to those of ordinary knowledge in Esau. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention proposes a method of delegating a master role when a communication function cannot be performed due to an error in a device serving as a domain master that controls nodes belonging to a specific domain in a grid network communication environment. To this end, the present invention sets any one of the nodes that access the domain master as a secondary domain master in the preset domain master, reports the configured secondary domain master information to the global master, and then the domain master If it is determined to be off, the process includes delegating a domain master role to the secondary domain master. By doing so, even if there is a situation in which the domain master is absent, the continuous domain communication service is possible because the secondary domain master plays the role of the domain master instead.

Hereinafter, a configuration of a grid network system including nodes belonging to a domain used in the present invention and a domain master will be described with reference to FIG. 1.

Referring to FIG. 1, the grid network system includes the domain masters 105, 115, and 123 and the domain masters 105 and 115, which control various nodes belonging to each domain 100, 110, and 120, and the nodes. , A global master 130 for controlling 123. Specifically, as shown in FIG. 1, the plurality of nodes 101, 102, 103, and 104 constitute one domain 100, and a domain master for controlling the nodes 101, 102, 103, and 104. 105 is set. The plurality of nodes 101, 102, 103, and 104 may transmit and receive data via the domain master 105. Examples of the plurality of nodes and domain masters include electronic devices such as TVs, refrigerators, and computers. In this way, the domain masters 105, 115, and 123 are configured in each of the domains 100, 110, and 120 so that nodes belonging to the respective domains 100, 110, and 120 communicate with each other. 115 and 123 control each node.

Hereinafter, the operation of the domain master will be described in detail with reference to FIG. 2. 2 is an internal block diagram of a domain master controlling nodes belonging to a specific domain according to an embodiment of the present invention.

Referring to FIG. 2, the domain master 105 includes a controller 200 for controlling the nodes 101, 102, and 103, and a transmitter / receiver 205, 210 for transmitting and receiving data. The control unit 200 is a domain master function, bandwidth allocation and QoS support for nodes, permission for new nodes, number of nodes in a domain, transmission power and frequency band restrictions, periodic communication with nodes in a domain, domain status monitoring, It controls the communication with the global master and performs communication with the nodes 101, 102, 103, 104 through the domain master function.

In detail, the control unit 200 sets any one of the nodes connected to the domain master controlling the nodes belonging to the domain as the second domain master to take the role of the domain master. In addition, the controller 200 determines whether the off state of the domain master occurs, and when it is determined that such off state is to occur, the domain master to inform the nodes and the global master 130 belonging to the off schedule of the off state. Transmit change information.

Therefore, as shown in FIG. 3, the nodes 101, 102, 103, 104, 111, 112, 113, and 114 belonging to each domain 100, 110 communicate with each other in the domain 100, 110. Masters 105 and 115 are present. If the domain master 105 in the domain 100 is turned off due to a lack of operable power or a situation in which communication is impossible during communication, nodes 101, 102, 103, and 104 belonging to the domain 100 are in an off state. ) Will cause communication to be broken.

In this case, since the nodes 101, 102, 103, and 104 belonging to the domain 100 are not in communication with the domain master 105 in a sleep mode to reduce power consumption, the domain master 105 is turned off. Not known. In addition, even if the nodes 101, 102, 103, 104 are switched from the sleep mode to the wake-up mode, they cannot communicate with the domain master 105, thereby preventing communication between the nodes. In addition, the global master 130 may not be able to communicate periodically or aperiodically with the domain master 105 to obtain information about the nodes 101, 102, 103, and 104. Therefore, before the domain master 105 is turned off, the domain 100 requires setting of a secondary domain master to replace the domain master role.

To this end, according to an exemplary embodiment of the present invention, when the preset domain master 105 in the domain 100 is turned off, any one of the nodes 101, 102, 103, and 104 belonging to the domain 100 is second. We propose a method to configure as a domain master. In FIG. 4, the node 101 is configured as the secondary domain master instead of the domain master 105. In particular, according to an embodiment of the present invention, it is determined whether each node accessing the domain master 105 is a node capable of a domain master role, and according to the order of accessing the domain master 105 among the nodes capable of acting as the domain master 105. Grant the qualification as a domain master.

For example, in FIG. 4, when the node 101 has a domain master function, when the node 101 first contacts the domain master 105, the domain master 105 contacts the node 101. Set as Secondary Domain Master. After the node 101 is set as the second domain master, when the domain master 105 is actually turned off, the node 101 is delegated the domain master role to operate as the second domain master. When the domain master 105 configures the secondary domain master as described above, information about the secondary domain master is provided to the nodes 102, 103, 104 and the global master 130 that are connected in the future.

A transmission frame as shown in FIG. 5 may be used to provide information about this secondary domain master. FIG. 5 illustrates a structure of a transport frame of a physical layer according to an embodiment of the present invention, wherein the transport frame includes a preamble 500, a header 510, and an additional channel estimation symbol. 520 and a payload 530. First, the preamble 500 is used to synchronize the domain master 105, the nodes 101, 102, 103, 104, and the global master 130.

In particular, the embodiment of the present invention will be described taking the case of providing the information on the secondary domain master through the header 510 of the transmission frame structure as an example. The header 510 has a structure as shown in Table 1 below, and the structure of the header 510 is not limited thereto.

The 'DID' field in Table 1 indicates a device ID. Each node may be distinguished using the 'DID' field. If the nodes in the domain have domain master functions to access the domain master, the domain master allocates the second domain master according to the connection order among the nodes having the domain master function. For example, since device ID numbers are assigned according to the connection order, the node to which device ID 1 is assigned is set as the secondary domain master. In this way, the domain master can set the secondary domain master to replace the domain master role in advance so that the secondary domain master can perform the domain master function in the future.

Also, for a node to be connected after initially setting the node to be initially connected to the domain master as the second domain master, the domain master assigns the order from the device ID 2 and informs which node is the configured second domain master. Then, the domain master reports the information on the secondary domain master to the global master 130 upon coordination between the global master 130 and the domain master.

On the other hand, there are two main criteria for determining when a node configured as a second domain master operates as a domain master, depending on whether an off state is announced in the domain master. One embodiment of the present invention relates to a process of assigning a secondary domain master when the off-state domain master is not known, and another embodiment of the present invention relates to a secondary domain master when the off-state domain master is notified in advance. It is about the assignment process.

First, a second domain master assignment process will be described with reference to FIG. 6.

Referring to FIG. 6, the global master 130 assigns a node initially connected in steps 600 and 605 as a domain master to manage nodes belonging to the domain. The domain master 105 then controls the nodes when the nodes belonging to the domain connect to the domain master 105. Accordingly, when node 1 101 initially accesses the domain master 105 in step 610, the domain master 105 allocates a device ID and a second domain master resource to node 1 101. At this time, the domain master 105 determines whether the connected node 1 101 is an electronic device capable of serving as a domain master. Secondary domain masters can be assigned only to nodes capable of acting as domain masters, that is, nodes with domain master functions. Therefore, when the domain master 105 determines that the domain master role is possible, the domain master 105 assigns the device ID and also grants the qualification of the second domain master. For example, the domain master 105 sets the secondary domain master by assigning device ID # 1.

Thereafter, in step 625, the node ID 102 that accesses the domain master 105 announces the device ID assignment and the secondary domain master information. In other words, it notifies that the node 1 101 is set as the second domain master while assigning the next device ID. The notification of the secondary domain master information is achieved by informing the device ID of the node 1 101 or by transmitting information indicating that the secondary domain master is assigned to another node.

In addition, the domain master 105 periodically exchanges information with the global master 130 as in step 630. The domain master 105 exchanges setting information of the secondary domain master as in step 635 during such periodic information exchange. To the global master 130. Thereafter, the domain master 105 and the global master 130 exchange information through periodic exchanges as in step 640, and the coordination and resources are allocated in step 645 between the domain master 105 and the nodes, in step 650. In the idle mode request and confirmation process is performed. Through this process, resource allocation and data exchange between the global master 130, the domain master 105, and the nodes 101 and 102 can be performed.

Meanwhile, a PHY frame may be used to share information about the secondary domain master with the nodes and the global master 130. The frame configuration may be represented as in Table 2 below, and the structure thereof is not limited thereto. Do not.

In Table 2, the 'DID' field is a field used for allocating a device ID. The 'SDM' field represents second domain master selection information. The 'DID' field and the 'SDM' field are used to provide information that the domain master 105 sets up as the second domain master while allocating a device ID to the node 1 101 that is initially connected.

Subsequently, the device ID allocation and the information on the secondary domain master are announced to the node 2 102 accessing the domain master 105. For this purpose, the 'DID' field and the 'SNID' field in Table 2 are used. do. Here, the 'SNID' field includes device ID information of a node configured as the second domain master. The node 2 102 may use the 'SNID' field to know the device ID information of the node 1 101. For example, when the device ID information is the device ID 1, the node 1 101 is the secondary domain. You can see that you are a master. By using the fields in Table 2 as described above, it can be known that the node 1 101 is the secondary domain master.

In Table 2, the 'DMC' field is used to notify the change of the domain master. If it is determined that the domain master 105 is off in the global master 130, the global master 130 uses the 'DMC' field to node 2 102 belonging to the domain and node 1 101 set as the second domain master. Send the domain master change information.

When the bit of the 'DMC' field in Table 2 is set to '11110000', the global master 130 plays a role of notifying the domain master change to the nodes 1, 2 (101, 102) belonging to the domain. do. This bit allocation can be used in various settings. The time point for setting the 'DMC' field to '11110000' may be transmitted even when the domain master 105 is off or before it is turned off.

When receiving the frame having the above bits assigned to the 'DMC' field, the second domain master Node 1 (101) acts as a domain master instead of the domain master 105, the node 2 (102) An operation such as accessing the node 1 101 is performed. In other words, the node 1 (101) and the node 2 (102) performs the same operation as the above-described second domain master setup procedure. Accordingly, an operation such as setting a third domain master among the nodes connected to the node 1 101 is performed.

If the nodes 101 and 102 belonging to the domain are not in communication after the second domain master setup, the domain master 105 may be turned off as in step 655. In addition to the sleep mode, a situation may occur in which the domain master 105 is turned off without notice during communication, and in this case, the present invention is also applicable.

When the domain master 105 is turned off due to lack of communication or power depletion, the nodes 101 and 120 belonging to the domain wake up as in the steps 660 and 665 and the domain master 105 wakes up. Notifying 105 does not receive any response. As such, the nodes 101 and 102 cannot communicate with the domain master 105 that controls the nodes 101 and 120, and thus communication with each other becomes impossible. Similarly, since the domain master 105 is in an off state, information exchange is not performed as in step 670, so that periodic or aperiodic communication with the global master 130 is not possible.

Accordingly, when the nodes 101 and 120 wake up, the global master 130 has no response from the domain master 105 for a predetermined time in step 675, the node 1 101 and the node that are the secondary domain masters in step 680. 2 (102) is notified of the change of the domain master. As such, when the global master 130 does not communicate with the domain master 105 for a predetermined time, the global master 130 transmits the domain master change information using the 'DMC' field of Table 2. In FIG. 6, the global master 130 simultaneously transmits the domain master change information to the node 1 101 and the node 2 102, which are the second domain masters, as in step 680. It is of course possible to implement different transmission times, such as transmitting to node 1 (101) first and then to node 2 (102).

When receiving the frame including the domain master change information, Node 2 (102) belonging to the domain and Node 1 (101), the second domain master, continue to communicate by changing the domain master using the 'DMC' field information. You will proceed. Accordingly, Node 1 (101), which is the secondary domain master, performs the operation as the domain master instead of the domain master (105). In operation 690, the coordination and resource allocation operation is performed between the node 1 101 and the node 2 102, which are the second domain masters. In other words, the node 1 (101) and the node 2 (102) performs the same operation as the above-described second domain master setup procedure. Accordingly, an operation such as setting a third domain master among the nodes connected to the node 1 101 is performed. Even when the third domain master is configured, only nodes capable of performing the domain master role among the nodes set the third domain master role.

As described above, even after the domain master 105 is suddenly turned off after setting the secondary domain master, continuous communication can be performed through the above process. Also, in case the second domain master 101 and the domain master 105 are turned off at the same time, the second domain master is configured as in the third domain master configuration method among the nodes initially connected to the domain master 105 after the second master configuration. You can set the domain master in advance. Thereafter, when the second domain master 101 and the domain master 105 are turned off at the same time, information exchange between the global master 130 and the nodes is continuously performed by delegating a domain master role to a node configured as the third domain master. do.

On the other hand, in the foregoing description, when the node 1 (101) and the node 2 (102) sequentially connects to the domain master 105, the second domain master is set according to the connection order. If multiple nodes have access simultaneously, the Secondary Domain Master can be configured in the following way.

First, when setting the second domain master, the domain master 105 may select any one of the nodes connected at the same time or select a node that can serve as the domain master for a long time. For example, when a TV and a refrigerator are connected simultaneously with a domain master function, the TV is frequently turned on / off by a user, while the refrigerator is on second for a refrigerator rather than a TV because the refrigerator is kept on for a long time. It may be desirable to assign a logical domain master role.

Hereinafter, when the domain master has previously announced the off state according to another embodiment of the present invention, the allocation process of the secondary domain master will be described with reference to FIG. 7.

Steps 700 to 745 of FIG. 7 are the same as operations of steps 600 to 645 of FIG. 6, and thus a detailed description thereof will be omitted. According to another embodiment of the present invention, the domain master 105 determines whether a power off is to be generated in step 750. For example, when the remaining power amount is less than or equal to the predetermined power amount, it can be predicted that power off will occur. In this case, the domain master 105 provides change information of the domain master to the global master 130 and the nodes 1 and 2 (101, 102) in steps 755 and 760. As such, when the domain master change information, which is the status information on the power-off, is transmitted to the global master 130 and the nodes 1, 2 (101, 102), the global master 130 and the nodes 1, 2 (101, 102 knows that domain master 105 is to be powered off.

Here, the domain master change information may be transmitted to the global master 130 and the nodes 1 and 2 (101, 102) at the same time or at a time difference. For example, suppose that the domain master 105 is a TV. If the TV set as the second domain master is notified after the OFF state is announced in advance, the node set as the second domain master becomes a domain master. In general, since the off situation in the domain master 105 does not occur at a predetermined time, the domain master 105 may transmit domain master change information to notify the off situation through a contention slot or the like. have. In addition, since this off situation occurs randomly, it is also possible to transmit such domain master change information by allocating a slot other than the contention slot.

Thereafter, when the domain master 105 is powered off in step 765, information exchange is not performed between the global master 130 and the domain master 105 as in step 770. Accordingly, if it is determined in step 775 that there is no response from the domain master 105 for a predetermined time, in step 780, the node 1, 2 (101, 102) is notified of the change of the domain master. Steps 775 to 790 of FIG. 7 are the same as operations of steps 675 to 690 of FIG. 6.

On the other hand, the domain master change information in steps 755 and 760 and the 'DMC' field of Table 2 are used the same to notify the change of the domain master in step 780. However, bits allocated to the 'DMC' field may vary depending on who transmits the domain master 105 or the global master 130. For example, if the bit '00001111' is assigned to the 'DMC' field, then this bit allocation is assigned to node 1 101, node 2 102, and global master 130, where domain master 105 is a secondary domain master. Represents domain master change information sent to the server.

In contrast, when the bit allocated to the 'DMC' field is '11110000', this indicates domain master change information transmitted by the global master 130 to the node 1 (101) and the node 2 (102), which are second domain masters. In addition, as shown in FIG. 6, the transmission of the domain master change information in step 780 may be performed simultaneously or with a time difference. In addition, the 'DMC' field having the bit allocation '00001111' is transmitted to the nodes 1, 2 (101, 120) and the global master 130 while the domain master 105 is in a communicable state, but the bit allocation is '11110000'. In the case of the 'DMC' field, the global master 130 may transmit the domain master 105 even if the domain master 105 is already turned off or before it is turned off.

As described above, according to the present invention, by setting a second domain master to replace the domain master role in advance, when the domain master is turned off, the second domain master is delegated the role of the domain master to manage nodes belonging to the domain. Done.

Claims (17)

In the method for domain master assignment in a domain consisting of a plurality of nodes,
Setting any one of the nodes connected to the domain master controlling the nodes belonging to the domain as the second domain master to take the role of the domain master;
And when the domain master is turned off, delegating a role of the domain master to the set second domain master.
The method of claim 1, wherein the setting of the second domain master to the second domain master comprises:
Determining whether a domain master function exists for nodes accessing the domain master;
And setting the second domain master according to the order of accessing the domain master among the nodes having the domain master function.
The method of claim 2, wherein the setting of the second domain master is performed by:
And setting a node, which has access to the domain master first among the nodes having the domain master function, as the second domain master.
4. The method of claim 3, further comprising: announcing information about the configured secondary domain master to nodes accessing the domain master after configuring the secondary domain master. 5. Way.
The method of claim 2,
And setting a node operable as a domain master as the second domain master when the nodes having the domain master function simultaneously access the second domain master.
The method of claim 1,
And after setting any one node as the second domain master, reporting information on the set second domain master to a global master controlling the domain master. Way.
The method of claim 6,
The domain master further comprises the step of notifying the change of the domain master to the configured secondary domain master and the nodes connected to the domain master when there is no response for a predetermined time from the domain master Method for assignment.
The method of claim 1,
Determining whether the domain master is to be off;
If it is determined that the off state is to occur, further comprising the step of transmitting change information of the domain master to the set secondary domain master, nodes accessing the domain master, and a global master controlling the domain master. For domain master assignment.
4. The method of claim 3, further comprising setting a node that next accesses the domain master as a third domain master to replace the second domain master.
In the apparatus for domain master assignment in a domain consisting of a plurality of nodes,
Set any one of the nodes connected to the domain master controlling the nodes belonging to the domain as the secondary domain master to take the role of the domain master, and in the off state to the configured secondary domain master to the domain master A control unit for reporting the second domain master setting to a global master that controls the domain master to delegate the role of;
And a transceiver configured to communicate with nodes belonging to the domain.
The method of claim 10, wherein the control unit,
Determining whether there is a domain master function for the nodes accessing the domain master, and setting the second domain master according to the order of accessing the domain master among the nodes having the domain master function; Device for master assignment.
The method of claim 11, wherein the control unit,
And a second node configured to access the domain master first among the nodes having the domain master function as the second domain master.
The method of claim 11, wherein the control unit,
And a device ID assigned to the node that first accesses the domain master and information indicating that the second domain master has been set in the order of accessing the domain master.
The method of claim 13, wherein the control unit,
And after the second domain master is set, nodes accessing the second domain master are informed of the set second domain master.
The method of claim 13, wherein the control unit,
And a node which next accesses the domain master as a third domain master to replace the second domain master.
The method of claim 10, wherein the control unit,
It is determined whether the off-occurrence is scheduled, and if it is determined that the off-occurrence is scheduled, domain master allocation, characterized in that the change information of the domain master to the set secondary domain master, the nodes connected to the domain master and the global master Device for.
13. The apparatus according to claim 12,
And a node capable of operating as a domain master for a long time as the second domain master when the nodes having the domain master function access at the same time.

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