CN101080077A - Maintenance method of device management tree and terminal device - Google Patents

Abstract

The invention discloses a method for maintaining a device management tree in the field of OMA DM, which includes a terminal device updating the authority control list of a corresponding node in the device management tree; When there is no maintenance authority in the authority control list of each node between nodes, the node is maintained. The present invention also discloses a method for maintaining a device management tree, which includes traversing the nodes in the device management tree by the terminal device; When there is no maintenance authority in the authority control list of each node among the nodes, the traversed node is maintained. The invention also discloses the corresponding terminal equipment. The invention can avoid the bad influence caused by garbage nodes or garbage subtrees on the processing performance of terminal equipment and network transmission resources.

Description

Maintenance method of equipment management tree and terminal equipment

technical field

The present invention relates to the technical field of Open Mobile Alliance (OMA, Open Mobile Alliance) device management (DM, Device Management), in particular to a method for maintaining a device management tree and a terminal device thereof.

Background technique

The Open Mobile Alliance Device Management (OMA DM, Open Mobile Alliance Device Management) specification is a technology for managing, diagnosing and maintaining mobile terminal equipment. It manages terminal equipment through OTA (Over The Air). Device management operations include: parameter setting of terminal devices, firmware update, software installation and upgrade, and fault diagnosis. Among them, the mobile terminal devices managed by OMA DM specification include mobile phone terminals, handheld computers, notebook computers, embedded devices and vehicle systems, etc., while not excluding any other mobile terminal devices.

As shown in Figure 1, it is a model diagram of the overall management architecture of the existing DM specification. In the model diagram of the overall management architecture, the device management agent (DM Agent) on the terminal device is used to explain and execute various Management commands; the DM management tree stored on the terminal device can be considered as an interface for a device management server (DMS, DM Server) to manage the terminal device through the DM protocol. The DM management tree includes a set of basic management objects (MO , Management Object), DMServer controls terminal device resources through management operations on each management object in the DM management tree. Among them, the management commands for DM Server to operate each node of the DM management tree include Get (get command), Replace (replace command), Exec (execute command), Copy (copy command) and Delete (delete command).

As shown in Figure 2, it is a schematic diagram of the structural status of each management object in the management tree in the existing terminal equipment. The DM management tree of each terminal equipment must have a root node, and each child node on the tree is divided into internal nodes and leaf nodes. The connection parameter management objects and device information management objects in Figure 2 all belong to internal nodes, while the device ID, manufacturer, and terminal model all belong to leaf nodes. The nodes in the management tree include permanent nodes and dynamic nodes. The permanent nodes refer to the nodes that cannot be generated and deleted by the device management server during operation, such as the built-in nodes of the device manufacturer in the terminal device. A node is a permanent node; a dynamic node refers to a node that allows the device management server to be dynamically generated and deleted during operation.

The OMA DM specification defines a set of attribute values of device management tree nodes, which are used to describe each node. Each attribute value mainly includes: access control list (ACL, Access Control List), type (Type), format (Format), Name (Name), size (Size), title (Title), timestamp (TStamp), multipurpose Internet Mail Extensions (MIME, Multipurpose InternetMail Extensions) type of node value, etc. Among them, the authority control of the operation management tree node of the device management server is realized through the ACL of the node, and the operation authority of the device management server to this node is set by configuring the device management server ID in the ACL; if a certain item in the ACL description If the command does not use the device management server ID, but uses the "*" ID, it is considered that the command operation authority of this node is open to all authenticated device management servers. For example, the following ACL expression:

Add=ServerA&Delete=ServerA&Replace=ServerA+ServerB&Get=*

Indicates that the device management server A has Add, Delete and Replace permissions for the node identified by the ACL, and the device management server B has the Replace permission for the node identified by the ACL, and any authenticated device management server has the Get authority. The operation commands that the ACL can adapt to include: Add, Delete, Exec, Get and Replace operation commands.

If the ACL of a certain node in the device management tree is empty, that is, the ACL expression of the node is ACL=, it is considered that the operation authority of the node can inherit the operation authority of the parent node.

If an operation authority contained in the ACL of a node is configured with only one ServerID, the ServerID will be deleted when the device management server corresponding to the ServerID needs to cancel the operation permission, such as the ACL expression of a node as follows:

Replace=ServerA&Get=ServerA+ServerB;

Then when the operation authority of ServerA is cancelled, the ACL expression of this node will become: Get=ServerB;

If all operation rights of all device management servers on this node are cancelled, the ACL expression of this node will become: ACL=.

In order to make the entire device management tree controllable, an initial ACL will be assigned to the root node of the management tree, and this ACL will be configured as: Add=*&Get=*, which means that all authenticated device management servers can access the management tree The root node performs Add and Get operations. After deleting all permissions in the ACL of the root node, the ACL of the root node will return to the initial setting state or set all operation permissions of the root node to "*".

The current OMA DM specification stipulates that the root node of the device management tree in the terminal device cannot be set with the Replace permission, so that when the device management server manages the terminal device through the DM protocol, it may occur when the ACL value of the node changes. As a result, some nodes cannot be managed by any device management server, thus becoming garbage nodes. For example, the ACL value configuration of each node in a device management subtree is shown in Figure 3. If the operation authority of ServerA on each node is deleted, the ACL value configuration of the device management subtree shown in Figure 3 will become as shown in Figure 3. In the case shown in 4, after deleting the operation authority of ServerA to each node, the ACL value of NodeB will completely inherit the ACL value of the parent node, that is, the ACL value of NodeB becomes Add=*&Get=*, which results in no device The management server can perform operations such as Replace, Delete, Copy, or Exec on the node NodeB, so that it becomes a garbage subtree or a garbage node.

It can be seen that when the device management server manages the terminal device through the DM protocol, if the ACL value of the node changes, it may cause garbage nodes or garbage subtrees to appear in the terminal equipment, and too many garbage nodes or garbage subtrees The tree often wastes a large amount of storage resources and system processing resources of the terminal device, thereby reducing the overall processing performance of the terminal device; at the same time, because the device management server obtains the entire management tree structure in the terminal device Afterwards, and identify them, in order to carry out follow-up management on the terminal equipment, if there are a large number of garbage nodes or garbage subtrees in the equipment management tree of the terminal equipment, it is bound to cause the equipment management server to obtain the management tree structure of the terminal equipment. The amount of data increases, which wastes the transmission resources of the network, especially for wireless networks, wireless transmission resources are very precious.

Contents of the invention

The present invention proposes a method for maintaining a device management tree to solve the adverse effects caused by garbage nodes or garbage subtrees on terminal equipment processing performance and network transmission resources in the prior art.

Correspondingly, the present invention also provides a terminal device.

In order to solve the above problems, the technical scheme proposed by the present invention is as follows:

A method for maintaining a device management tree, comprising the steps of:

The terminal device updates the permission control list of the corresponding node in the device management tree; and

When it is determined that there is no maintenance authority in the updated authority control lists of the node, the root node, and nodes between the node and the root node, the node is maintained.

Preferably, the method further includes the step of receiving an update instruction by the terminal device, and the update instruction is used to trigger the terminal device to update the permission control list of the corresponding node;

The terminal device updates the permission control list of the corresponding node according to the received update instruction.

Preferably, the update of the authority control list of the corresponding node refers to: in the process of deleting the management authority of the device management server, if the terminal device traverses the device management tree and finds that the authority control list contains the identifier of the device management server to be deleted When the node is located, delete the server ID included in the access control list of the traversed node.

Preferably, the terminal device receives a deletion instruction issued by the user to delete the management authority of the device management server; and executes the process of deleting the management authority of the device management server according to the identification of the device management server to be deleted contained in the deletion instruction.

Preferably, the terminal device receives a deletion instruction issued by the corresponding equipment management server to delete the management authority of the equipment management server; deal with.

Preferably, maintaining the node means that the terminal device judges whether the node is a dynamic node, and if so, deletes the subtree rooted at the node in the device management tree.

Preferably, maintaining the node refers to:

The terminal device judges whether the node is a dynamic node, and if so, prompts the user whether to confirm deletion of the subtree rooted at the node; and

After receiving the confirmation instruction from the user, delete the subtree rooted at the node in the device management tree.

Preferably, maintaining the node refers to opening the maintenance authority of the node to all authenticated device management servers.

Preferably, maintaining the node means that a specified device management server takes over the maintenance authority of the node.

Preferably, the maintenance right is a replacement right for the device management server to perform update processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is the replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device; and the deletion authority to perform delete processing on the device management tree nodes in the terminal device.

A terminal device comprising:

An authority control list updating unit, configured to update the authority control list of the corresponding node in the device management tree;

A judging unit, configured to judge whether there is maintenance authority in the authority control list of the node updated by the authority control list updating unit, the root node, and each node between the updated node and the root node;

A node maintenance unit, configured to maintain the node updated by the authority control list updating unit when the judgment result of the judging unit is negative.

Preferably, the terminal device further includes an update instruction receiving unit for receiving an update instruction, and the update instruction is used to trigger the terminal device to update the permission control list of the corresponding node;

The authority control list updating unit updates the authority control list of the corresponding node according to the update instruction received by the update instruction receiving unit.

Preferably, the authority control list updating unit specifically includes:

The traversal subunit is used for the terminal device to traverse the node in the device management tree that contains the identifier of the server to be deleted in the device management tree according to the identifier of the device management server to be deleted during the process of deleting the management authority of the device management server;

The identifier deletion subunit is used to delete the identifier of the server to be deleted contained in the permission control list of the node traversed by the traversal subunit.

Preferably, the terminal device further includes a maintenance policy storage unit, which is used to pre-store a set maintenance policy;

The node maintenance unit maintains the updated node according to the maintenance policy stored in the maintenance policy storage unit.

Preferably, the node maintenance unit specifically includes:

The first judging subunit is used to judge whether the node updated by the authority control list updating unit is a dynamic node when the judging result of the judging unit is no;

The first subtree deletion subunit is configured to delete the subtree rooted at the node updated by the authority control list update unit when the determination result of the first determination subunit is yes.

Preferably, the node maintenance unit specifically includes:

The second judging subunit is used to judge whether the node updated by the authority control list updating unit is a dynamic node when the judging result of the judging unit is No;

The deletion prompt subunit is used to prompt the user whether to confirm the deletion of the subtree rooted at the node updated by the authority control list update unit when the judgment result of the second judging subunit is Yes;

The second subtree deletion subunit is configured to delete the subtree rooted at the node updated by the authority control list update unit after receiving the confirmation instruction from the user.

Preferably, the node maintenance unit maintains the updated node by opening the maintenance authority of the node updated by the authority control list updating unit to all authenticated device management servers.

Preferably, the node maintenance unit maintains the updated node by designating a specified device management server to take over the maintenance authority of the node updated by the authority control list updating unit.

Preferably, the maintenance right is a replacement right for the device management server to perform update processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is the replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device and the deletion authority to perform delete processing on the device management tree nodes in the terminal device.

A method for maintaining a device management tree, comprising the steps of:

the end device traverses the nodes in the device management tree; and

Execute when each node is traversed: when it is determined that there is no maintenance authority in the authority control list of the traversed node, the root node, and nodes between the traversed node and the root node, maintain the traversed node.

Preferably, maintaining the traversed node means that the terminal device judges whether the node is a dynamic node, and if so, deletes the subtree rooted at the node in the device management tree.

Preferably, maintaining the traversed node refers to:

The terminal device judges whether the node is a dynamic node, and if so, prompts the user whether to confirm deletion of the subtree rooted at the node; and

After receiving the confirmation instruction from the user, delete the subtree rooted at the node in the device management tree.

Preferably, maintaining the traversed node refers to opening the maintenance authority of the node to all authenticated device management servers.

Preferably, maintaining the traversed node means that a specified device management server takes over the maintenance authority of the node.

Preferably, the maintenance right is a replacement right for the device management server to perform update processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is the replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device; and the deletion authority to perform delete processing on the device management tree nodes in the terminal device.

A terminal device comprising:

The node traversal unit is used to traverse the nodes in the device management tree;

A judging unit, configured to judge whether the node traversed by the node traversing unit, the root node, and the authority control list of each node between the traversed node and the root node exist when the node traversing unit traverses each node. maintenance authority;

The node maintenance unit is configured to maintain the traversed node when the determination result of the determination unit is negative.

Preferably, the terminal device further includes a maintenance policy storage unit, which is used to pre-store a set maintenance policy;

The node maintenance unit maintains the nodes according to the maintenance policy stored in the maintenance policy storage unit.

Preferably, the node maintenance unit specifically includes:

The first judging subunit is used to judge whether the node traversed by the node traversing unit is a dynamic node when the judging result of the judging unit is no;

The first subtree deletion subunit is configured to delete the subtree rooted at the node traversed by the node traversal unit when the determination result of the first determination subunit is yes.

Preferably, the node maintenance unit specifically includes:

The second judging subunit is used to judge whether the node traversed by the node traversing unit is a dynamic node when the judging result of the judging unit is No;

The deletion prompt subunit is used to prompt the user whether to confirm the deletion of the subtree rooted at the node traversed by the node traversal unit when the judgment result of the second judging subunit is Yes;

The second subtree deletion subunit is configured to delete the subtree whose root is the node traversed by the node traversal unit after receiving the confirmation instruction from the user.

Preferably, the node maintenance unit maintains the node by opening the maintenance authority of the traversed node to all authenticated device management servers.

Preferably, the node maintenance unit maintains the node by designating a specified device management server to take over the maintenance authority of the traversed node.

Preferably, the maintenance right is a replacement right for the device management server to perform update processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device.

Preferably, the maintenance authority is the replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device and the deletion authority to perform delete processing on the device management tree nodes in the terminal device.

The beneficial effect that the present invention can reach is as follows:

In the first technical solution of the present invention, when updating the ACL of a certain node of the DM tree in the terminal device, the updated node, the root node, and each node between the updated node and the root node are timely correlated and detected. Judging, under the situation that there is no maintenance authority (such as Replace authority and/or Delete authority) respectively in the ACL of each node between the node that draws this update, root node and this update node and root node, to this update The nodes in the DM tree perform relevant maintenance processing, so that after the terminal device updates the ACL of a certain node in the DM tree, it can better prevent the garbage subtree or garbage caused by the change of the ACL information of the node. node phenomenon, thereby better preventing the impact of garbage subtrees or garbage nodes on the overall processing performance of the terminal device, and also better preventing the device management server from obtaining When the terminal device manages the tree structure information, it needs to obtain too much information, thus saving network transmission resources.

In the second technical solution of the present invention, the terminal device traverses each node in the DM under the corresponding external trigger mechanism or in a regular manner, and judges the traversed node, the root node and the When there is no maintenance authority (such as Replace authority and/or Delete authority) in the ACL of each node between the traversed node and the root node, the maintenance process is performed on the traversed node, thereby also preventing There are too many garbage nodes or garbage subtrees in the terminal equipment, so it is better to prevent the influence of garbage subtrees or garbage nodes on the overall processing performance of the terminal equipment, and it is also better to prevent the existence of more garbage in the terminal equipment When the device management server obtains the terminal device management tree structure information when subtrees or garbage nodes need to obtain too much information, it saves network transmission resources.

Description of drawings

Figure 1 is a model diagram of the overall management structure of the existing DM specification;

Fig. 2 is a schematic diagram of the structural state of each management object in the management tree in the existing terminal equipment;

Fig. 3 is a schematic diagram of the ACL value configuration of each node in a device management subtree;

Fig. 4 is a schematic diagram of the ACL value configuration of each node in the device management subtree after deleting the operation authority of ServerA to each node in Fig. 3;

Fig. 5 is the main realization principle flowchart of the maintenance method of the first device management tree proposed by the present invention;

Fig. 6 is according to first kind of method principle of the present invention, deletes the main realization flow chart that DM tree is maintained under the management authority situation of certain DM Server to terminal equipment;

FIG. 7 is a schematic diagram of a subtree and its permissions added by a certain device management server to a DM tree in a certain terminal device in an embodiment of the present invention;

FIG. 8 is a schematic diagram of node permissions after deleting the ServerA identification according to the prior art on the basis of FIG. 7;

Figure 9 is a schematic diagram of the state after deleting the entire subtree with the node NodeB as the root after deleting the ServerA identifier on the basis of Figure 7;

Figure 10 is a schematic diagram of the state after deleting the ServerA identifier and opening the Replace authority of NodeB to all authenticated device management servers on the basis of Figure 7;

Figure 11 is a schematic diagram of the status after deleting the ServerA identifier and taking over the Replace authority of NodeB by a specific device management server on the basis of Figure 7;

Fig. 12 is according to the principle of the first method of the present invention, in the case of deleting the management authority of a certain DM Server to the terminal equipment, the second embodiment processing flowchart of maintaining the DM tree;

FIG. 13 is a structural block diagram of the main components of the first type of terminal device proposed by the present invention;

FIG. 14 is a structural block diagram of the first embodiment of the first terminal device proposed by the present invention;

FIG. 15 is a structural block diagram of a second embodiment of the first terminal device proposed by the present invention;

FIG. 16 is a structural block diagram of an embodiment of a node maintenance unit in the first terminal device of the present invention;

Fig. 17 is the main realization principle flowchart of the second DM tree maintenance method proposed by the present invention;

FIG. 18 is a structural block diagram of the main components of the second type of terminal equipment proposed by the present invention;

FIG. 19 is a structural block diagram of an embodiment of a node maintenance unit in a second type of terminal device according to the present invention.

Detailed ways

In the OMA DM specification, each certified device management server manages the terminal device by operating each node of the device management tree stored in the terminal device. In order to control the corresponding management of the terminal device DM tree by different device management servers Authority, the terminal device maintains the corresponding ACL value in each node of its own device management tree, and sets the device management server ID and the corresponding management authority relationship expression for the ACL value maintained by the node to identify the corresponding device management server. Nodes have corresponding administrative rights.

The first technical solution of the present invention is aimed at updating the ACL of the corresponding node in the DM tree, which may cause garbage nodes or garbage subtrees to appear in the terminal device due to the update of the ACL of the relevant node, thereby reducing the overall processing performance and performance of the terminal device. In view of the problem of wasting transmission resources, a processing scheme is proposed that can better prevent garbage nodes or garbage subtrees from appearing in the terminal equipment when updating the ACL of the corresponding node in the DM tree of the terminal equipment.

The main realization principles, specific implementation methods and corresponding beneficial effects of the technical solution of the present invention will be described in detail below in conjunction with each accompanying drawing.

As shown in Figure 5, it is a flow chart of the main realization principle of the maintenance method of the first device management tree proposed by the present invention, and its main realization process is as follows:

Step S10, the terminal device updates the ACL information of the corresponding node in the DM tree;

A better way is that after the terminal device receives an update command issued by the outside world (such as issued by the user) to trigger the terminal device to update the ACL information of the corresponding node, it can update the DM according to the received update command. The ACL information of the corresponding node in the tree is updated;

Another better way is that in the process of deleting the management authority of a certain DM Server, if the terminal device traverses the node in the DM tree that contains the DM Server ID to be deleted in the ACL information, it will traverse the ID of the node. The DM Server ID included in the ACL information is deleted, thereby also achieving the purpose of updating the ACL information of the node.

Step S20, when the terminal device determines that the updated ACL information of the node, the root node, and the nodes between the node and the root node does not have maintenance rights, it performs maintenance processing on the node.

The way to maintain the nodes that meet the above judgment conditions and perform ACL update can be, but not limited to, the following processing ways:

1. The terminal device judges whether the updated node is a dynamic node, and if so, deletes the subtree rooted at the node in the DM tree, or deletes the subtree rooted at the node upon confirmation by the user;

2. Open the maintenance authority of the node to all certified DM Servers;

3. Designate the specified DM Server to take over the maintenance authority of the node.

Wherein the maintenance authority specifically can refer to the replacement authority (Replace authority) that the DM Server performs update processing on the DM tree node in the terminal device; it can also refer to the deletion authority (Delete authority) that the DM Server performs the deletion process on the DM tree node in the terminal device; It can refer to the Replace permission and the Delete permission.

The main implementation principle of the above-mentioned method of the present invention is described in more detail below by taking the deletion of the management authority of a certain DM Server to the terminal device as an example. As shown in Figure 6, for according to the first kind of method principle of the present invention, under the situation of deleting certain DM Server to the management authority of terminal equipment, the main realization flow diagram that DM tree is maintained, its specific implementation process is as follows:

S50. During the process of deleting the management authority of the device management server, the terminal device traverses the DM tree according to the identification (ID) of the device management server to be deleted, that is, scans the ACL values of each node in the entire DM tree to search for the ACL values contained in the ACL respectively. The node of the DM Server ID;

A preferred embodiment is that the terminal device receives the deletion instruction issued by the user to delete the management authority of the device management server, and executes the process of deleting the management authority of the device management server according to the DM Server ID to be deleted contained in the deletion instruction .

Another preferred embodiment is that the terminal device receives a deletion command issued by the corresponding device management server to delete the management authority of the device management server, and executes the deletion of the device management server according to the corresponding DM Server ID to be deleted contained in the deletion command. The processing of administrative rights.

Step S60, when the terminal device finds each node satisfying the above conditions, delete the DM Server ID included in the node's ACL; and

Step S70, judge to delete the node of this DM Server ID, the root node and the ACL of each node between this node and the root node do not respectively have maintenance authority (as Replace authority and/or Delete authority) after deleting this DM Server ID , the node is maintained.

A maintenance strategy can be stored in the terminal device in advance. When the terminal device judges that the node that meets the above conditions needs to be maintained, it can maintain the node according to the pre-stored maintenance strategy; When the node is being maintained, the user is prompted to input a corresponding maintenance strategy, and the terminal device can perform corresponding maintenance processing on the node according to the maintenance strategy input by the user.

Among them, one of the following three maintenance strategies can be used, but not limited to, to maintain the nodes that meet the conditions and need to be maintained. The maintenance strategy can be preset by the user or by the terminal device (DM Client) itself. It can also be pre-set by the device management server whose management rights are about to be removed:

(1) Delete the entire subtree rooted at the searched dynamic node satisfying the conditions in step S70, so that the terminal device executes in the above step S70 on the searched nodes satisfying the conditions in step S70: the terminal device Determine whether the node is a dynamic node, and if so, delete the entire subtree rooted at the node in the DM tree; or

The terminal device judges whether the node is a dynamic node, and if so, prompts the user to confirm whether to delete the entire subtree rooted at the node, and deletes the entire subtree rooted at the node in the DM tree after receiving the confirmation instruction from the user. subtree.

(2) Open the maintenance authority (such as Replace authority and/or Delete authority) of the nodes found to meet the conditions in the above step S70 to all authenticated device management servers, so that the terminal device can search for the nodes in the above step S70 The node that satisfies the condition in step S70 executes: in the ACL maintained for the node, the DMServer ID corresponding to the maintenance authority (such as Replace authority and/or Delete authority) is set to *.

(3) The specified device management server takes over the maintenance authority (such as Replace authority and/or Delete authority) of the nodes found to meet the conditions in the above step S70, so that the terminal device in the above step S70 satisfies the conditions found in the step S70 The node execution of the middle condition: In the ACL maintained for this node, set the DM Server ID corresponding to the maintenance authority (such as Replace authority and/or Delete authority) to the specified DM Server ID. Specifically specify which device management server will take over the Replace authority and/or Delete authority of the searched nodes that meet the conditions, which can be preset by the user, or by the DM Client itself, and can also be managed by the node that is about to be deleted. Permissions are pre-set on the device management server.

The principle of the above embodiment is that when the terminal device cancels the management authority of a certain device management server to it, it traverses the entire DM tree (the depth traversal method or the breadth traversal method can be used), that is, each node in the entire DM tree Scan the ACL information of a node, if it is found that the ACL of a node contains the ID of the device management server, delete the ID of the device management server in the ACL of the node; and make a judgment after deleting the ID of the device management server for the node , if there are maintenance rights (such as Replace rights and/or Delete rights) in the ACL information of the node, the root node, and the nodes between the node and the root node, then the maintenance process of the node ends and proceeds normally Scanning of other nodes; if there is no maintenance authority (such as Replace authority and/or Delete authority) in the ACL information of the node, the root node, and the nodes between the node and the root node, the terminal device is in the following three maintenance Select one of the processing methods in the policy to perform subsequent maintenance on the node. The maintenance policy can be a policy set by the user, or the default processing policy of DM Client, or the device management whose management authority will be deleted. Policy set by the server:

① The terminal device judges whether the node is a dynamic node, and if so, deletes the entire subtree rooted at the node in the DM tree, or deletes the entire subtree rooted at the node in the DM tree after requesting user confirmation;

②In the ACL maintained for the node, set the Replace permission and/or Delete permission of the node to all authenticated device management servers, that is, based on the existing permission assignment of the node ACL that deletes the device management server identifier Add: Set the device management server ID corresponding to the Replace permission and/or Delete permission to "*";

③ Set the Replace permission and/or Delete permission of the node to be taken over by a specified device management server, that is, increase the existing permission assignment of the node ACL after deleting the device management server ID: replace its Replace permission and/or Or change the ID of the device management server corresponding to the Delete permission to the ID of the takeover device management server. Which device management server to take over can be set by the user, can also be set by the DM Client, and can also be set by the device management server whose management authority is about to be deleted.

A specific embodiment will be enumerated below to set forth more specifically the main realization principle of the above-mentioned method of the present invention:

Assume that an authorized device management server adds a subtree to the DM tree of a certain terminal device, the added subtree and its permissions are shown in Figure 7, where in the DM tree of the terminal device, NodeB's The permissions are:

Get=*&Add=*&Replace=ServerA&Delete=ServerA

The ACLs of NodeC and NodeD inherit the ACL information of NodeB.

Namely: ServerA has the Replace authority and the Delete authority respectively for the three nodes; and the Get authority and the Add authority of the three nodes are respectively open to all device management servers that can pass the authentication.

When deleting the management authority of the terminal device from the device management server A, the terminal device will traverse and scan its own DM tree to delete the ServerA identifier in the ACL information of each node in the DM tree, and delete the ServerA identifier in the ACL information of each node in the DM tree. After deleting the ServerA identifier in the ACL, the subtree and its permissions in the terminal device are shown in Figure 8. It can be seen that the node NodeB is directly connected to the root node Root, and the ACL of this node is deleted after the ServerA identifier There is no Replace permission and Delete permission anymore, and there is no Replace permission and Delete permission in the ACL information of the root node, so the terminal device can maintain the NodeB in the following way:

One way is to delete or ask the user to confirm and delete the entire subtree rooted at the node NodeB. The state diagram of the deleted subtree is shown in Figure 9;

Another way is to open the Replace authority of the node NodeB to all device management servers that can pass the authentication, and the processed subtree state schematic diagram is shown in Figure 10;

Another way is that a specific device management server (such as ServerB) continues to take over the Replace authority of the node NodeB, and its processed subtree state schematic diagram is shown in FIG. 11 .

With respect to the implementation of the first DM tree maintenance of the above-mentioned deletion of the management authority of the terminal device by the DM Server in the present invention, the terminal device can also traverse and scan the DM stored in itself during the process of deleting the management authority of a certain device management server to itself. The ACL information of each node in the tree, and delete the identification of the device management server contained in the ACL of each node in the entire DM tree, and subsequently (you can delete the server identification in the ACL of each node in the DM tree Execute immediately, or after a specified period of time) respectively determine whether there is maintenance authority (such as Replace authority and Delete Permissions), for nodes without maintenance permissions (such as neither Replace permission nor Delete permission), perform maintenance processing.

According to the above-mentioned thought, please refer to Fig. 12, this figure is according to the principle of the first method of the present invention, in the case of deleting the management authority of a certain DM Server to the terminal equipment, the second embodiment of the process flow diagram of maintaining the DM tree, its The main implementation process is as follows:

Step S100, in the process of deleting the management authority of the device management server, the terminal device traverses the entire DM tree stored by itself according to the identification (ID) of the device management server to be deleted, that is, scans the ACL information of each node of the entire DM tree to obtain Search for the nodes containing the DM Server ID in the ACL respectively;

Step S200, the terminal device deletes the DM Server ID contained in the ACL of the node for each node found in the above processing, and finally completes the DM Server ID recorded in the ACL of the corresponding node in the entire DM tree stored by itself. The DM Server ID is all deleted, so that the DM Server ID is not included in the ACL information of the entire DM tree, and the purpose of deleting the management authority of the device management server to itself is completed;

Step S300, after finishing deleting the management authority of this DM Server through above-mentioned process (can carry out immediately after above-mentioned step S100 and step S200 process are finished, also can certain specified time after above-mentioned step S100 and step S200 process finish Execute after the section), the terminal device executes for each node that deletes the server ID:

When it is judged that there is no maintenance authority (such as Replace authority and/or Delete authority) in the ACL of the node, the root node and the nodes between the node and the root node, the node is maintained.

A maintenance strategy can be pre-stored in the terminal device. When the terminal device determines that a node that meets the above conditions needs to be maintained, it can maintain the node that meets the condition according to the pre-stored maintenance strategy. Of course, it can also When the node needs to be maintained, the user is prompted to input a corresponding maintenance policy, and the terminal device can perform corresponding maintenance processing on the node according to the maintenance policy input by the user.

One of the following three maintenance strategies can be used, but not limited to, as a way to maintain the nodes. The maintenance strategy can be preset by the user, or by the terminal device (DM Client) itself. Can be pre-set by the device management server whose management rights are about to be removed:

A. Delete the entire subtree rooted at the dynamic node that meets the conditions in step S300, so that the terminal device executes on the node that meets the conditions in step S300 in the above step S300: the terminal device judges whether the node is a dynamic node, and if so Then delete the entire subtree rooted at the node in the DM tree;

Or the terminal device judges whether the node is a dynamic node, and if so, prompts the user to confirm whether to delete the entire subtree rooted at the node, and deletes the subtree rooted at the node in the DM tree after receiving the confirmation instruction from the user. the entire subtree.

B. Open the maintenance authority (such as Replace authority and/or Delete authority) of the nodes meeting the conditions in the above step S300 to all authenticated device management servers, so that the terminal device will satisfy the nodes in the conditions in the step S300 in the above step S300 Execution: In the ACL maintained for this node, set the DM Server ID corresponding to the maintenance permission (such as Replace permission and/or Delete permission) to *.

C. The specified device management server takes over the maintenance authority (such as Replace authority and/or Delete authority) of the node meeting the conditions in the above step S300, so that the terminal device executes on the node meeting the conditions in the step S300 in the above step S300: In the ACL maintained for this node, the DM Server ID corresponding to the maintenance authority (such as Replace authority and/or Delete authority) is set to the specified DM ServerID. Specifically specify which device management server will take over the Replace authority and/or Delete authority of the child nodes that meet the conditions, which can be preset by the user, or by the DM Client itself, or by the user whose management authority is about to be deleted. The device management server is preset.

The main implementation process of the above-mentioned second embodiment is to perform traversal processing on the entire DM tree when the terminal device cancels the management authority of a certain device management server (the depth traversal method or the breadth traversal method can be adopted), that is, the entire DM tree is traversed. Scan the ACL information of each node in the DM tree. If the ACL of a node contains the ID of the device management server, delete the ID of the device management server in the ACL of the node without performing any detection and verification on the node. Judgment processing, such that at a certain point in time after the above-mentioned operation processing of the entire DM tree is completed, the following maintenance operations are performed on each node that deletes the server identifier:

Judge whether there is maintenance authority (such as Replace authority and/or Delete authority) in the ACL of each node between this node, root node (Root) and this node and root node respectively, for not having maintenance authority (as neither having Replace authority , and there is no Delete permission), then perform subsequent maintenance processing on the node.

Corresponding to the first DM tree maintenance method proposed above in the present invention, the present invention also proposes a terminal device correspondingly here, as shown in FIG. 13 , which is a main structural block diagram of the first terminal device proposed in the present invention. It mainly includes three components: an authority control list update unit 10, a judgment unit 20 and a node maintenance unit 30. The main functions of each component are as follows:

An authority control list update unit 10, configured to update the ACL information of the corresponding node in the DM tree;

A judging unit 20, configured to judge whether there is maintenance authority in the ACL of the node updated by the authority control list updating unit 10, the root node, and the nodes between the updated node and the root node;

The node maintenance unit 30 is configured to perform maintenance processing on the node updated by the authority control list updating unit 10 when the determination result of the determination unit 20 is negative.

Similarly, the maintenance authority mentioned in the above terminal device may specifically refer to the Replace authority, or the Delete authority, or both the Replace authority and the Delete authority.

As shown in Figure 14, it is a block diagram of the composition structure of the first embodiment of the first terminal device proposed by the present invention. On the basis of the main composition structure of the above-mentioned Figure 13, it further includes an update instruction receiving module for receiving update instructions. Unit 40, wherein the update instruction is used to trigger the terminal device to update the ACL information of the corresponding node; in this way, the authority control list update unit 10 can update the ACL information of the corresponding node according to the update instruction received by the update instruction receiving unit 40.

As shown in FIG. 15 , it is a structural block diagram of the second embodiment of the first type of terminal device proposed by the present invention, wherein the authority control list update unit 10 in FIG. 13 specifically includes a traversal subunit 110 and an identification deletion subunit 120, in:

The traversal subunit 110 is used for the terminal device to traverse the node in the DM tree that contains the identifier of the server to be deleted in the ACL information according to the identification (ID) of the device management server to be deleted during the process of deleting the management authority of the device management server;

The identification deletion subunit 120 is configured to delete the identification of the server to be deleted contained in the ACL of the node traversed by the traversal subunit 110, so as to update the ACL information of the corresponding node.

Wherein the terminal device may further include a maintenance strategy storage unit for pre-storing a set maintenance strategy; in this way, when the judgment result of the judging unit 20 is negative, the above-mentioned node maintenance unit 30, based on the maintenance strategy storage unit The stored maintenance policy performs maintenance processing on the node updated by the authority control list updating unit 10 . Of course, the terminal device can also prompt the user to input a corresponding maintenance policy when it needs to perform maintenance processing on the node updated by the authority control list updating unit 10, and the terminal device can perform corresponding maintenance policies on the updated node according to the maintenance policy input by the user. Maintenance is done.

Wherein, the node maintenance unit 30 may perform maintenance processing on the corresponding node in the following situations:

A better manner is: the node maintenance unit 30 is composed of a first judgment subunit and a first subtree deletion subunit, wherein the first judgment subunit is used to, when the judgment result of the above judgment unit 20 is negative, Judging whether the node updated by the authority control list update unit 10 is a dynamic node, the first subtree deletion subunit is used to delete the dynamic node updated by the above-mentioned authority control list update unit 10 when the judgment result of the first judgment subunit is yes. The node is the root of the subtree.

Another preferred mode is that the node maintenance unit 30 uses the dynamic node updated by the above-mentioned authority control list update unit 10 as the root when the judgment result of the above-mentioned judging unit 20 is negative, and the terminal device is confirmed by the user. Subtree deletion. As shown in FIG. 16 , it is a structural block diagram of an embodiment of the node maintenance unit in the first terminal device of the present invention, which mainly includes a second judgment subunit 310, a deletion prompt subunit 320 and a second subtree deletion subunit 330, in:

The second judging subunit 310 is configured to judge whether the node updated by the authority control list updating unit 10 is a dynamic node when the judging result of the judging unit 20 is no;

The deletion prompt subunit 320 is used to prompt the user whether to confirm the deletion of the subtree rooted at the node updated by the authority control list update unit 10 when the determination result of the above-mentioned determination unit 20 is No;

The second subtree deletion subunit 330 is configured to delete the subtree whose root is the node updated by the authority control list update unit 10 in the DM tree after receiving the confirmation instruction from the user.

Another preferred manner is that the node maintenance unit 30 opens the maintenance authority of the node updated by the authority control list update unit 10 to all authenticated device management servers when the determination result of the determination unit 20 is No; The node maintenance unit 30 sets the device management server ID corresponding to the node's maintenance authority (such as Replace authority and/or Delete authority) to * in the ACL maintained by the node updated by the authority control list update unit 10 .

Another preferred mode is that the node maintenance unit 30 specifies a specified device management server to take over the maintenance authority of the node updated by the above-mentioned authority control list update unit 10 when the determination result of the above-mentioned determination unit 20 is No; In the ACL maintained by the node updated by the authority control list update unit 10, the maintenance unit 30 sets the equipment management server identification corresponding to the maintenance authority (such as Replace authority and/or Delete authority) of the node as the specified equipment management server logo.

In addition, for other specific related technical implementation details of the first type of terminal device proposed in the present invention, please refer to the detailed description of related technical implementation in the above-mentioned method of the present invention, and no more details are given here.

The technical solution of the present invention also proposes that the terminal device can traverse the nodes in its own DM tree in accordance with a preset periodic rule when it is triggered by the outside world, such as when it receives a trigger command from the user, and each node traversed Execution: when it is determined that there is no maintenance authority in the ACL information of the traversed node, the root node, and nodes between the traversed node and the root node, perform maintenance processing on the traversed node.

As shown in Figure 17, it is a flow chart of the main realization principle of the second DM tree maintenance method proposed by the present invention, and its main realization process is as follows:

Step S500, the terminal device traverses each node in its own DM tree, wherein the terminal device can traverse each node in its own DM tree when receiving a trigger message from the user, or store a set periodic rule in advance, When each cycle time point is reached, it automatically executes the traversal of each node in its own DM tree;

Step S600, the terminal device executes when traversing each node: when it is judged that there is no maintenance authority in the ACL information of the traversed node, the root node, and the nodes between the node and the root node, the traversed node Perform maintenance processing.

The manner in which the terminal device maintains the traversed nodes meeting the above judgment conditions may, but is not limited to, refer to the following processing methods:

1. The terminal device judges whether the node is a dynamic node, and if so, deletes the subtree rooted at the node in the DM tree, or deletes the subtree rooted at the node upon confirmation by the user;

2. Open the maintenance authority of the node to all certified DM Servers;

3. Designate the specified DM Server to take over the maintenance authority of the node.

Wherein the maintenance authority specifically can refer to the replacement authority (Replace authority) that the DM Server performs update processing on the DM tree node in the terminal device; it can also refer to the deletion authority (Delete authority) that the DM Server performs the deletion process on the DM tree node in the terminal device; It can refer to the Replace permission and the Delete permission.

Obviously, this DM tree maintenance method can also prevent garbage subtrees or garbage nodes from appearing in the terminal equipment, thereby avoiding the impact of too many garbage subtrees or garbage nodes on the overall processing performance of the terminal equipment, and reducing the The amount of information that the DM Server needs to obtain when obtaining the overall structure information of the DM tree in the terminal device achieves the purpose of saving air interface transmission resources.

Corresponding to the second DM tree maintenance method proposed above in the present invention, the present invention also proposes a terminal device correspondingly here, as shown in FIG. 18 , which is a main structural block diagram of the second terminal device proposed in the present invention. It mainly includes three components: a node traversal unit 100, a judgment unit 200 and a node maintenance unit 300. The specific functions of each component unit are as follows:

The node traversal unit 100 is configured to traverse each node in the DM tree; wherein the node traversal unit 100 may traverse each node of the DM tree in the terminal device when receiving a trigger message from the user, or may pass Store a set cycle rule, and automatically execute the traversal of each node of the DM tree in the terminal device when each cycle time point is reached;

The judging unit 200 is configured to judge whether the node traversed by the node traversing unit 100, the root node, and the ACL information of each node between the traversed node and the root node are maintained when the node traversing unit 100 traverses each node. authority;

The node maintenance unit 300 is configured to maintain the node traversed by the node traversing unit 100 when the determination result of the determination unit 200 is negative.

Similarly, the maintenance authority mentioned in the above terminal device may specifically refer to the Replace authority, or the Delete authority, or both the Replace authority and the Delete authority.

Wherein the terminal device may further include a maintenance strategy storage unit for pre-storing a set maintenance strategy; in this way, when the judgment result of the judgment unit 200 is negative, the above-mentioned node maintenance unit 300, based on the maintenance strategy storage unit The stored maintenance policy performs maintenance processing on the node traversed by the node traversing unit 100 . Of course, the terminal device can also prompt the user to input a corresponding maintenance strategy when it is necessary to perform maintenance processing on the node traversed by the node traversal unit 100, and the terminal device can perform corresponding maintenance on the traversed node according to the maintenance strategy input by the user. Maintenance is done.

Wherein, the node maintenance unit 300 may perform maintenance processing on the traversed nodes satisfying the judgment conditions, which may have the following situations:

A better manner is: the node maintenance unit 300 is composed of a first judgment subunit and a first subtree deletion subunit, wherein the first judgment subunit is used to, when the judgment result of the judgment unit 200 is no, Judging whether the node traversed by the node traversal unit 100 is a dynamic node, the first subtree deletion subunit is used to delete the dynamic node traversed by the above-mentioned node traversal unit 100 when the judgment result of the above-mentioned first judgment subunit is yes rooted subtree.

Another better way is that when the judgment result of the above judgment unit 200 is negative, the terminal device will take the dynamic node traversed by the above node traversal unit 100 as the child of the root under the condition of the user's confirmation. Tree deletion. As shown in FIG. 19 , it is a structural block diagram of an embodiment of the node maintenance unit in the second terminal device of the present invention, which mainly includes a second judgment subunit 3010, a deletion prompt subunit 3020 and a subtree deletion subunit 3030, wherein:

The second judging subunit 3010 is configured to judge whether the node traversed by the node traversing unit 100 is a dynamic node when the judging result of the judging unit 200 is negative;

The deletion prompt subunit 3010 is used to prompt the user whether to confirm the deletion of the subtree rooted at the dynamic node traversed by the node traversal unit 100 when the judgment result of the second judgment subunit 3010 is yes;

The second subtree deletion subunit 3030 is configured to delete the subtree whose root is the dynamic node traversed by the node traversal unit 100 in the DM tree after receiving the confirmation instruction from the user.

Another preferred mode is that the node maintenance unit 300 opens the maintenance authority of the node traversed by the above-mentioned node traversal unit 100 to all authenticated device management servers when the judgment result of the above-mentioned judgment unit 200 is No; The maintenance unit 300 sets the device management server identifier corresponding to the maintenance authority (such as the Replace authority and/or the Delete authority) of the node to * in the ACL maintained for the node traversed by the node traversal unit 100 .

Another preferred mode is that the node maintenance unit 30 specifies a specified device management server to take over the maintenance authority of the node updated by the above-mentioned authority control list update unit 10 when the determination result of the above-mentioned determination unit 20 is No; In the ACL maintained by the node traversed by the node traversing unit 100, the maintenance unit 300 sets the device management server identifier corresponding to the node's maintenance authority (such as Replace authority and/or Delete authority) as the specified device management server identifier .

In addition, for other specific related technical implementation details of the second type of terminal device proposed in the present invention, please refer to the related technical implementation details in the above-mentioned method of the present invention, and no more details are given here.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (40)

1. A method for maintaining a device management tree, comprising the steps of: The terminal device updates the permission control list of the corresponding node in the device management tree; and When it is determined that there is no maintenance authority in the updated authority control lists of the node, the root node, and nodes between the node and the root node, the node is maintained. 2. The method according to claim 1, further comprising the step of the terminal device receiving an update instruction, the update instruction being used to trigger the terminal device to update the authority control list of the corresponding node; The terminal device updates the permission control list of the corresponding node according to the received update instruction. 3. The method according to claim 1, wherein updating the authority control list of the corresponding node refers to: when the terminal device deletes the management authority of the device management server, if the authority control list is traversed in the device management tree When the list contains the node with the ID of the device management server to be deleted, the server ID included in the authority control list of the traversed node is deleted. 4. The method according to claim 3, wherein the terminal device receives a deletion instruction issued by the user to delete the management authority of the device management server; and The process of deleting the management authority of the device management server is performed according to the identifier of the device management server to be deleted contained in the deletion instruction. 5. The method according to claim 3, wherein the terminal device receives a deletion instruction issued by the corresponding device management server to delete the management authority of the device management server; and The process of deleting the management authority of the device management server is performed according to the identifier corresponding to the device management server to be deleted included in the deletion instruction. 6. The method according to claim 1, wherein maintaining the node refers to: The terminal device judges whether the node is a dynamic node, and if so, deletes the subtree rooted at the node in the device management tree. 7. The method according to claim 1, wherein maintaining the node refers to: The terminal device judges whether the node is a dynamic node, and if so, prompts the user whether to confirm deletion of the subtree rooted at the node; and After receiving the confirmation instruction from the user, delete the subtree rooted at the node in the device management tree. 8. The method according to claim 1, wherein maintaining the node refers to opening the maintenance authority of the node to all authenticated device management servers. 9. The method according to claim 1, wherein maintaining the node means that a specified device management server takes over the maintenance authority of the node. 10. The method according to claim 1, 8 or 9, wherein the maintenance authority is a replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device. 11. The method according to claim 1, 8 or 9, wherein the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device. 12. The method according to claim 1, 8 or 9, wherein the maintenance authority is a replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device; and Deletion authority to perform deletion processing on the device management tree node in the terminal device. 13. A terminal device, characterized by comprising: An authority control list updating unit, configured to update the authority control list of the corresponding node in the device management tree; A judging unit, configured to judge whether there is maintenance authority in the authority control list of the node updated by the authority control list updating unit, the root node, and each node between the updated node and the root node; A node maintenance unit, configured to maintain the node updated by the authority control list updating unit when the judgment result of the judging unit is negative. 14. The terminal device according to claim 13, further comprising an update instruction receiving unit configured to receive an update instruction, the update instruction being used to trigger the terminal device to update the permission control list of the corresponding node; The authority control list updating unit updates the authority control list of the corresponding node according to the update instruction received by the update instruction receiving unit. 15. The terminal device according to claim 13, wherein the permission control list update unit specifically includes: The traversal subunit is used for the terminal device to traverse the node in the device management tree that contains the identifier of the server to be deleted in the device management tree according to the identifier of the device management server to be deleted during the process of deleting the management authority of the device management server; The identifier deletion subunit is used to delete the identifier of the server to be deleted contained in the permission control list of the node traversed by the traversal subunit. 16. The terminal device according to claim 13, further comprising a maintenance policy storage unit for pre-storing a set maintenance policy; The node maintenance unit maintains the updated node according to the maintenance policy stored in the maintenance policy storage unit. 17. The terminal device according to claim 13, wherein the node maintenance unit specifically includes: The first judging subunit is used to judge whether the node updated by the authority control list updating unit is a dynamic node when the judging result of the judging unit is no; The first subtree deletion subunit is configured to delete the subtree rooted at the node updated by the authority control list update unit when the determination result of the first determination subunit is yes. 18. The terminal device according to claim 13, wherein the node maintenance unit specifically includes: The second judging subunit is used to judge whether the node updated by the authority control list updating unit is a dynamic node when the judging result of the judging unit is No; The deletion prompt subunit is used to prompt the user whether to confirm the deletion of the subtree rooted at the node updated by the authority control list update unit when the judgment result of the second judging subunit is Yes; The second subtree deletion subunit is configured to delete the subtree rooted at the node updated by the authority control list update unit after receiving the confirmation instruction from the user. 19. The terminal device according to claim 13, characterized in that, the node maintenance unit performs maintenance on the updated node by opening the maintenance authority of the node updated by the authority control list updating unit to all authenticated device management servers. maintain. 20. The terminal device according to claim 19, wherein the node maintenance unit maintains the updated node by designating a specified device management server to take over the maintenance authority of the node updated by the authority control list updating unit . 21. The terminal device according to claim 13, 19 or 20, wherein the maintenance authority is a replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device. 22. The terminal device according to claim 13, 19 or 20, wherein the maintenance right is a deletion right for the device management server to perform deletion processing on the device management tree nodes in the terminal device. 23. The terminal device according to claim 13, 19 or 20, wherein the maintenance authority is the replacement authority of the device management server to perform update processing on the device management tree nodes in the terminal device and the device management tree node in the terminal device. Delete permission for the node to perform delete processing. 24. A method for maintaining a device management tree, comprising the steps of: the end device traverses the nodes in the device management tree; and Execute when each node is traversed: when it is determined that there is no maintenance authority in the authority control list of the traversed node, the root node, and nodes between the traversed node and the root node, maintain the traversed node. 25. The method according to claim 24, wherein maintaining the traversed node refers to: The terminal device judges whether the node is a dynamic node, and if so, deletes the subtree rooted at the node in the device management tree. 26. The method according to claim 24, wherein maintaining the traversed node refers to: The terminal device judges whether the node is a dynamic node, and if so, prompts the user whether to confirm deletion of the subtree rooted at the node; and After receiving the confirmation instruction from the user, delete the subtree rooted at the node in the device management tree. 27. The method according to claim 24, wherein maintaining the traversed node means opening the maintenance authority of the node to all authenticated device management servers. 28. The method according to claim 24, wherein maintaining the traversed node means that a specified device management server takes over the maintenance authority of the node. 29. The method according to claim 24, 27 or 28, wherein the maintenance authority is a replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device. 30. The method according to claim 24, 27 or 28, wherein the maintenance authority is a deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device. 31. The method according to claim 24, 27 or 28, wherein the maintenance authority is the replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device; and Deletion authority to perform deletion processing on the device management tree node in the terminal device. 32. A terminal device, characterized by comprising: The node traversal unit is used to traverse the nodes in the device management tree; A judging unit, configured to judge whether the node traversed by the node traversing unit, the root node, and the authority control list of each node between the traversed node and the root node exist when the node traversing unit traverses each node. maintenance authority; The node maintenance unit is configured to maintain the traversed node when the determination result of the determination unit is negative. 33. The terminal device according to claim 32, further comprising a maintenance policy storage unit for pre-storing a set maintenance policy; The node maintenance unit maintains the nodes according to the maintenance policy stored in the maintenance policy storage unit. 34. The terminal device according to claim 32, wherein the node maintenance unit specifically includes: The first judging subunit is used to judge whether the node traversed by the node traversing unit is a dynamic node when the judging result of the judging unit is no; The first subtree deletion subunit is configured to delete the subtree rooted at the node traversed by the node traversal unit when the determination result of the first determination subunit is yes. 35. The terminal device according to claim 32, wherein the node maintenance unit specifically includes: The second judging subunit is used to judge whether the node traversed by the node traversing unit is a dynamic node when the judging result of the judging unit is No; The deletion prompt subunit is used to prompt the user whether to confirm the deletion of the subtree rooted at the node traversed by the node traversal unit when the judgment result of the second judging subunit is Yes; The second subtree deletion subunit is configured to delete the subtree whose root is the node traversed by the node traversal unit after receiving the confirmation instruction from the user. 36. The terminal device according to claim 32, wherein the node maintenance unit maintains the node by opening the maintenance authority of the traversed node to all authenticated device management servers. 37. The terminal device according to claim 32, wherein the node maintenance unit maintains the node by designating a specified device management server to take over the maintenance authority of the traversed node. 38. The terminal device according to claim 32, 36 or 37, wherein the maintenance authority is a replacement authority for the device management server to perform update processing on the device management tree nodes in the terminal device. 39. The terminal device according to claim 32, 36 or 37, wherein the maintenance authority is the deletion authority for the device management server to perform deletion processing on the device management tree nodes in the terminal device. 40. The terminal device according to claim 32, 36 or 37, wherein the maintenance authority is the replacement authority of the device management server to perform update processing on the device management tree nodes in the terminal device and the device management tree node in the terminal device. Delete permission for the node to perform delete processing.

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