WO2023035953A1

WO2023035953A1 - Method and apparatus for handling device roaming in mesh networking

Info

Publication number: WO2023035953A1
Application number: PCT/CN2022/114619
Authority: WO
Inventors: 许大伟; 魏煜; 武云飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-09-13
Filing date: 2022-08-24
Publication date: 2023-03-16
Also published as: CN115842771A

Abstract

Embodiments of the present disclosure provide a method and an apparatus for handling device roaming in MESH networking. The method comprises: if it is detected that a second routing device or a first terminal device is roaming, sending to other routing devices and a home gateway a notification message indicating that a change occurs in a networking topology, so as to cause the other routing devices and the home gateway to update the locally stored networking topology; obtaining multicast group information of a second terminal device or the first terminal device, the second terminal device being a device that accesses the second routing device; and providing a multicast data stream for the second terminal device or the first terminal device according to the multicast group information, such that the problem in the related art of playback interruption of a set-top box because multicast group information on devices is lost or erroneous due to the roaming of the set-top box or an upper-layer routing device, thereby preventing playback interruption of the set-top box.

Description

Method and device for processing device roaming under MESH networking

Cross References to Related Applications

This disclosure is based on the Chinese patent application CN202111071170.5 filed on September 13, 2021, with the title of "A MESH Networking Device Roaming Processing Method and Device", and claims the priority of this patent application, and the patent application is incorporated by reference. The disclosed content is incorporated in this disclosure in its entirety.

technical field

Embodiments of the present disclosure relate to the communication field, and in particular, relate to a method and device for processing device roaming in a MESH networking.

Background technique

With the maturity of the mesh technology, it has gradually become a common usage scenario for the set-top box STA (Starcom) to conduct services through the wireless access of the home gateway to the mesh network. Roaming of STAs and access points (APs for short) in Mesh networking is a common scenario. However, when the STA or AP roams, the multicast group information on each device will be lost or incorrect, causing the STA to stop playing and affecting the use of users. If the upper-layer routing device AP is roaming, the downlink STA may not be aware of it, and will not actively send join messages, and re-update the multicast group information of each device in the link. It may be necessary for the STA to switch channels or restart to continue playing. In the case of STA roaming, even if the STA sends a join message immediately after roaming, when the upper-layer device relearns the multicast group information, the flow will be cut off for a period of time.

Aiming at the problem of roaming of set-top boxes or upper-layer routing devices in related technologies, the multicast group information on each device will be lost or wrong, causing the set-top box to stop playing, and no solution has been proposed.

Contents of the invention

The embodiment of the present disclosure provides a method and device for processing device roaming under MESH networking, so as to at least solve the problem of related technology set-top boxes or upper-layer routing devices roaming, and the multicast group information on each device will be lost or wrong, causing the set-top box to stop playing. The problem.

According to an embodiment of the present disclosure, a method for processing device roaming in a MESH networking is provided, which is applied to a first routing device, including:

If it is detected that the second routing device or the first terminal device is roaming, send a notification message indicating that the networking topology has changed to other routing devices and the home gateway, so that the other routing devices and the home gateway update the locally stored The networking topology, wherein the other routing devices are routing devices other than the first routing device;

Acquiring the multicast group information of the second terminal device or the first terminal device, where the second terminal device is a device that accesses the second routing device;

providing a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.

According to another embodiment of the present disclosure, there is also provided a device roaming processing device under MESH networking, which is applied to the first routing device, including:

The first sending module is configured to send a notification message indicating a change in the networking topology to other routing devices and home gateways if it is detected that the second routing device or the first terminal device is roaming, so that the other routing devices and the home gateway The home gateway updates the locally stored networking topology, wherein the other routing devices are routing devices other than the first routing device;

An acquisition module configured to acquire multicast group information of a second terminal device or the first terminal device, wherein the second terminal device is a device that accesses the second routing device;

A providing module configured to provide a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.

Description of drawings

FIG. 1 is a block diagram of a hardware structure of a mobile terminal in a method for processing device roaming under MESH networking according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of a method for processing device roaming under MESH networking according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a common networking of mesh according to this embodiment;

FIG. 4 is a flow chart 1 of AP roaming without interrupting the multicast stream according to this embodiment;

FIG. 5 is a schematic diagram of AP roaming according to this embodiment;

FIG. 6 is a first schematic diagram of the 1905 self-defined extended message format according to this embodiment;

FIG. 7 is a second schematic diagram of the 1905 self-defined extended message format according to this embodiment;

Fig. 8 is a schematic diagram of the STA mac tlv message format according to the present embodiment;

FIG. 9 is a schematic diagram of the format of a group address tlv message according to this embodiment;

FIG. 10 is a second flow chart of AP roaming without interrupting the multicast stream according to this embodiment;

FIG. 11 is a flow chart 1 of STA roaming without interrupting the multicast stream according to this embodiment;

FIG. 12 is a schematic diagram of STA roaming according to this embodiment;

FIG. 13 is a second flow chart of STA roaming without interrupting the multicast stream according to this embodiment;

Fig. 14 is a block diagram of an apparatus for processing device roaming in a MESH networking according to this embodiment.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings and in combination with the embodiments.

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence.

The method embodiments provided in the embodiments of the present disclosure may be executed in mobile terminals, computer terminals or similar computing devices. Taking the example of running on a mobile terminal, Fig. 1 is a block diagram of the hardware structure of the mobile terminal according to the method for processing device roaming under MESH networking according to the embodiment of the present disclosure. As shown in Fig. 1, the mobile terminal may include one or more (Fig. 1 Only one is shown in the figure) processor 102 (processor 102 may include but not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned mobile terminal may also include A transmission device 106 and an input and output device 108 for communication functions. Those skilled in the art can understand that the structure shown in FIG. 1 is only for illustration, and it does not limit the structure of the above mobile terminal. For example, the mobile terminal may also include more or fewer components than those shown in FIG. 1 , or have a different configuration from that shown in FIG. 1 .

The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for processing device roaming under the MESH networking in the embodiment of the present disclosure, and the processor 102 runs the computer stored in the memory 104. program, so as to execute various functional applications and service chain address pool slicing processing, that is, to realize the above-mentioned method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory that is remotely located relative to the processor 102, and these remote memories may be connected to the mobile terminal through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 106 is used to receive or transmit data via a network. The specific example of the above network may include a wireless network provided by the communication provider of the mobile terminal. In one example, the transmission device 106 includes a network interface controller (NIC for short), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet in a wireless manner.

In this embodiment, a method for processing device roaming under MESH networking running on the above-mentioned mobile terminal or network architecture is provided, which is applied to a terminal, and the terminal accesses the source area through a dual connection (Dual Connection, referred to as DC). The current master node MN cell and the current secondary node SN cell, Fig. 2 is a flow chart of a device roaming processing method under MESH networking according to an embodiment of the present disclosure, as shown in Fig. 2, applied to the first routing device, the process includes the following step:

Step S202, if it is detected that the second routing device or the first terminal device is roaming, send a notification message indicating that the networking topology has changed to other routing devices and the home gateway, so that the other routing devices and the home gateway update The networking topology structure stored locally, wherein the other routing device is a routing device other than the first routing device;

Step S204, acquiring multicast group information of the second terminal device or the first terminal device, wherein the second terminal device is a device that accesses the second routing device;

Step S206, providing a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.

Through the above steps S202 to S206, if it is detected that the second routing device or the first terminal device is roaming, a notification message indicating that the networking topology has changed is sent to other routing devices and the home gateway, so that the other routing devices and the The home gateway updates the locally stored networking topology, wherein the other routing devices are routing devices other than the first routing device; acquiring the multicast of the second terminal device or the first terminal device group information, wherein the second terminal device is a device that accesses the second routing device; providing multicast data streams for the second terminal device or the first terminal device according to the multicast group information, It can solve the problem that related technology set-top boxes or upper-layer routing devices roam, and the multicast group information on each device will be lost or wrong, causing the set-top box to play out of stream. After the routing device or terminal device roams, each device updates the network according to the notification message. Topological structure, according to the obtained multicast group information, it provides multicast data flow for the set-top box, avoiding the interruption of the set-top box playback.

In an embodiment, before the above step S202, the hierarchical relationship between the second routing device and the home gateway is deleted from the locally stored network topology structure, and the second routing device is updated to the Under the level of the first routing device, to update the networking topology; or delete the hierarchical relationship between the first terminal device and the third routing device accessed before roaming from the networking topology, and update the first The terminal device is updated to the level of the first routing device, so as to update the networking topology.

In another embodiment, after the above step S202, the query message for querying the networking topology structure sent by the second routing device and the home gateway after receiving the notification message is received; The second routing device and the home gateway send a response message, where the response message is used to instruct the second routing device and the home gateway to delete the second routing device from the networking topology For the hierarchical relationship with the home gateway, the second routing device is updated to be under the hierarchical level of the first routing device, so as to update the networking topology.

In the embodiment of the present disclosure, in the above step S204, obtaining the multicast group information of the first terminal device may specifically include:

Obtain the multicast group information of the terminal device from the home gateway, and further, send a query request for querying the multicast group message to the home gateway by extending the 1905 protocol; receive a query response returned by the home gateway, Wherein, the query response carries the multicast group message; the multicast group message is obtained from the query response; or

receiving a multicast message for the terminal device to join the network, wherein the multicast message carries the multicast group information, and acquiring the multicast group information from the multicast message.

In an exemplary embodiment, before receiving the multicast packet for the terminal device to join the network, receive a general query sent by the home gateway to query the multicast group message of the terminal device; and send the general query to the terminal device.

The embodiment of the present disclosure can be applied to a mesh network. FIG. 3 is a schematic diagram of a common networking of a mesh according to this embodiment. As shown in FIG. 3 , it includes a home gateway (controller), 2 APs, and 1 set-top box (STA) .

After the Mesh network is stable, when the set-top box (STA) is connected to the network, the newly joined set-top box (STA) will actively send a multicast message to join the network. The multicast message carries the multicast group information. The set-top box (STA) in the network All uplink devices will learn the corresponding multicast information and send join messages to the upper layer device. After the set-top box (STA) joins the multicast group corresponding to the multicast information, the video can be played normally after the multicast stream comes down. However, in mesh networking, the controller will monitor the network situation in real time, and will actively notify the AP or STA to roam according to the signal strength or the quality of a certain link.

After roaming, the connected device will actively notify its own topo (topology) change and send a notification message. Other mesh devices in the topo will actively query the topo change. After obtaining the topo change, it will update to a new network. After Topo is updated, there are two ways to update the multicast group information of each device: Method 1: Mesh's 1905 protocol supports manufacturer expansion. The controller queries the multicast group information and configures it to its own multicast module. After the Controller network is updated, it updates the interface information of the stream delivery, and retransmits the multicast data stream in the cache after each reply to the query message of the multicast group. By querying the multicast group information for adding new devices accurately, 1905 needs to be extended, and the connected AP and home gateway need to negotiate the same standard. Method 2: After the Controller updates the topo, it can send a query message. After receiving the query message, the set-top box replies with a multicast message to join the network, and updates the multicast group information of the uplink device. All standard specifications are used, and it only needs to be used on the home gateway without involving multiple devices; the general query sent will be flooded on the AP.

Fig. 4 is a flow chart 1 of AP roaming without interrupting the multicast flow according to the present embodiment, as shown in Fig. 4 , including the following steps:

In step S401, a set-top box (STA) accesses a mesh network that has been networked.

Step S402, the set-top box (STA) sends a multicast message to join the network, the multicast message carries the multicast group information, the uplink AP and the home gateway learn the multicast group information, and correctly forward the multicast stream according to the multicast group information, the set-top box (STA) play the video stream normally;

Step S403, AP1 roams. Figure 5 is a schematic diagram of AP roaming according to this embodiment. As shown in Figure 5, AP2 at the online site deletes the hierarchical relationship between AP1 and the home gateway from the network topo, and updates it to its own level , and send a notification message to notify that there is a change in the networking;

Step S404, after receiving the notification message, AP1 and the home gateway send qury to AP2 to query the topo change of AP2;

Step S405, AP2 replies Response messages to AP1 and the home gateway respectively, and after receiving the Response messages, AP1 and the home gateway delete the hierarchical relationship between AP1 and the home gateway from the networking topo, and update their own networking topo;

Step S406, after AP2 has updated the networking topo, it finds that it is the uplink device of the STA, and sends a 1905 extended message to the home gateway to query the multicast group joined by the set-top box (STA);

Step S407, the home gateway replies to AP2 with a 1905 extended message, and replies to AP2 the multicast group joined by the set-top box (STA). The message format is shown in Figure 6-9, and AP2 configures the corresponding multicast group to the group broadcast module;

In step S408, the home gateway retransmits the multicast stream in the cache after replying to the 1905 extended message.

FIG. 10 is a second flow chart of AP roaming without interrupting the multicast flow according to this embodiment. As shown in FIG. 10 , it includes the following steps:

In step S1001, a set-top box (STA) accesses a mesh network that has been networked.

Step S1002, the set-top box (STA) sends a multicast join message, the uplink AP and the home gateway learn the multicast group, correctly forward the multicast stream, and the set-top box (STA) plays the video stream normally;

Step S1003, when AP1 roams, as shown in Figure 5, AP2 at the online site deletes the hierarchical relationship between AP1 and the home gateway from the networking topo, updates it to its own layer, and sends a notification message to notify that the networking has changed;

Step S1004, after receiving the notification message, AP1 and the home gateway send qury to AP2 to query the topo change of AP2;

Step S1005, AP2 replies Response messages to AP1 and the home gateway respectively, and after receiving the Response messages, AP1 and the home gateway delete the hierarchical relationship between AP1 and the home gateway from the networking topo, and update their own networking topos;

Step S1006, after the gateway updates the topo, it actively sends a general query message to the downlink port where the STA is located;

Step S1007, after receiving the general query, the STA replies to the home gateway to join the multicast group;

In step S1008, the home gateway retransmits the multicast stream in the cache after receiving the joining message.

FIG. 11 is a flow chart 1 of STA roaming without interrupting the multicast stream according to this embodiment. As shown in FIG. 11 , it includes the following steps:

In step S1101, the set-top box (STA) accesses the mesh network that has been networked.

Step S1102, the set-top box (STA) sends a multicast join message, the uplink AP and the home gateway learn the multicast group, correctly forward the multicast stream, and the set-top box (STA) plays the video stream normally;

Step S1103, STA roams. Figure 12 is a schematic diagram of STA roaming according to this embodiment. As shown in Figure 12, AP2 at the online site deletes the hierarchical relationship between the set-top box (STA) and AP1 from the networking topo, and updates to its own At the lower level, and send a notification message to notify that there is a change in the networking;

Step S1104, after receiving the notification message, AP1 and the home gateway send qury to AP2 to query the topo change of AP2;

Step S1105, AP2 replies the Response message to AP1 and the home gateway respectively, after receiving the Response message, AP1 and the home gateway delete the hierarchical relationship between the set-top box (STA) and AP1 from the networking topo, and update their own networking topo;

Step S1106, after AP2 has updated the networking topo, it finds that it is the uplink device of the STA, and sends a 1905 extended message to the home gateway to query the multicast group joined by the set-top box (STA);

Step S1107, the home gateway replies to AP2 with a 1905 extended message, and replies to AP2 the multicast group joined by the set-top box (STA). The message format is shown in Figure 6-9, and AP2 configures the corresponding multicast group to the group broadcast module;

In step S1108, the home gateway retransmits the multicast stream in the cache after replying to the 1905 extended message.

FIG. 13 is a second flow chart of STA roaming without interrupting the multicast stream according to this embodiment. As shown in FIG. 13 , it includes the following steps:

In step S1301, the set-top box (STA) accesses the mesh network that has been networked.

Step S1302, the set-top box (STA) sends a multicast join message, the uplink AP and the home gateway learn the multicast group, correctly forward the multicast stream, and the set-top box (STA) plays the video stream normally;

Step S1303, STA roams, as shown in Figure 12, AP2 at the online site deletes the hierarchical relationship between the set-top box (STA) and AP1 from the networking topo, updates the set-top box (STA) to its own level, and sends a notification message, Notify that there is a change in the networking;

Step S1304, after receiving the notification message, AP1 and the home gateway send qury to AP2 to query the topo change of AP2;

Step S1305, AP2 replies Response messages to AP1 and the home gateway respectively, and AP1 and the home gateway delete the hierarchical relationship between the set-top box (STA) and AP1 from the network topo after receiving the Response message, and update their own network topo;

Step S1306, after the gateway updates the topo, it actively sends a general query message to the downlink port where the STA is located;

Step S1307, after receiving the general query, the STA replies to the home gateway to join the multicast group;

In step S1308, the home gateway retransmits the multicast stream in the cache after receiving the joining message.

In the embodiment of the present disclosure, in the mesh networking, each device uses the 1905 standard specification to sense whether any device in the networking has roamed, so as to actively update the multicast group of the STA connected to it.

According to another embodiment of the present disclosure, there is also provided a device roaming processing device under the MESH network, which is applied to the first routing device. FIG. 14 is a block diagram of the device roaming processing device under the MESH network according to this embodiment, as shown in As shown in Figure 14, including:

The first sending module 142 is configured to, if it is detected that the second routing device or the first terminal device roams, send a notification message indicating a change in the networking topology to other routing devices and home gateways, so that the other routing devices and the home gateway The home gateway updates the locally stored networking topology, wherein the other routing device is a routing device other than the first routing device;

The obtaining module 144 is configured to obtain the multicast group information of the second terminal device or the first terminal device, wherein the second terminal device is a device that accesses the second routing device;

The providing module 146 is configured to provide a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.

In an exemplary embodiment, the device also includes:

The first update module is configured to delete the hierarchical relationship between the second routing device and the home gateway from the locally stored network topology, and update the second routing device to the first routing device. level, to update the networking topology; or

The second update module is configured to delete the hierarchical relationship between the first terminal device and the third routing device accessed before roaming from the networking topology, and update the first terminal device to the first routing device level to update the networking topology.

In an exemplary embodiment, the device also includes:

The first receiving module is configured to receive a query message for querying the networking topology sent by the second routing device and the home gateway after receiving the notification message;

The second sending module is configured to send a response message to the second routing device and the home gateway respectively, wherein the response message is used to instruct the second routing device and the home gateway Delete the hierarchical relationship between the second routing device and the home gateway in the network topology, and update the second routing device to be under the layer of the first routing device, so as to update the networking topology.

In an exemplary embodiment, the acquisition module 144 includes:

The obtaining submodule is configured to obtain the multicast group information of the terminal device from the home gateway; or

The receiving submodule is configured to receive the multicast message that the terminal device joins the network, wherein the multicast message carries the multicast group information, and obtains the multicast group information from the multicast message.

In an exemplary embodiment, the acquisition submodule is also set to

Sending a query request for querying the multicast group message to the home gateway by extending the 1905 protocol;

receiving a query response returned by the home gateway, wherein the query response carries the multicast group message;

Obtain the multicast group message from the query response.

In an exemplary embodiment, the device also includes:

The second receiving module is configured to receive a general query sent by the home gateway to query the multicast group message of the terminal device;

A third sending module, configured to send the general query to the terminal device.

According to yet another embodiment of the present disclosure, there is also provided a computer-readable storage medium, where a computer program is stored in the storage medium, wherein the computer program is configured to execute any one of the above method embodiments when running in the steps.

Embodiments of the present disclosure also provide a computer-readable storage medium, in which a computer program is stored, wherein the computer program is set to execute the steps in any one of the above method embodiments when running.

In an exemplary embodiment, the above-mentioned computer-readable storage medium may include but not limited to: U disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM) , mobile hard disk, magnetic disk or optical disk and other media that can store computer programs.

Embodiments of the present disclosure also provide an electronic device, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

In an exemplary embodiment, the electronic device may further include a transmission device and an input and output device, wherein the transmission device is connected to the processor, and the input and output device is connected to the processor.

For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and exemplary implementation manners, and details will not be repeated here in this embodiment.

Obviously, those skilled in the art should understand that each module or each step of the above-mentioned disclosure can be realized by a general-purpose computing device, and they can be concentrated on a single computing device, or distributed in a network composed of multiple computing devices In fact, they can be implemented in program code executable by a computing device, and thus, they can be stored in a storage device to be executed by a computing device, and in some cases, can be performed in an order different from that shown here. Or described steps, or they are made into individual integrated circuit modules, or multiple modules or steps among them are made into a single integrated circuit module to realize. As such, the present disclosure is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

A device roaming processing method under MESH networking, applied to a first routing device, comprising:

If it is detected that the second routing device or the first terminal device is roaming, send a notification message indicating that the networking topology has changed to other routing devices and the home gateway, so that the other routing devices and the home gateway update the locally stored The networking topology, wherein the other routing devices are routing devices other than the first routing device;

Acquiring the multicast group information of the second terminal device or the first terminal device, where the second terminal device is a device that accesses the second routing device;

providing a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.
The method according to claim 1, wherein, before sending a notification message indicating a change in the networking topology to other routing devices and home gateways, the method further comprises:

Delete the hierarchical relationship between the second routing device and the home gateway from the locally stored networking topology, and update the second routing device to the level of the first routing device, so as to update the Network topology; or

Delete the hierarchical relationship between the first terminal device and the third routing device accessed before roaming from the networking topology, and update the first terminal device to the level of the first routing device, so as to update the Network topology.
The method according to claim 1, wherein, after sending a notification message indicating a change in the networking topology to other routing devices and home gateways, the method further comprises:

receiving a query message for querying the networking topology sent by the second routing device and the home gateway after receiving the notification message;

sending a response message to the second routing device and the home gateway respectively, where the response message is used to instruct the second routing device and the home gateway to delete the For the hierarchical relationship between the second routing device and the home gateway, update the second routing device to the level of the first routing device, so as to update the networking topology.
The method according to claim 1, wherein obtaining the multicast group information of the first terminal device comprises:

Obtaining the multicast group information of the terminal device from the home gateway; or

receiving a multicast message for the terminal device to join the network, wherein the multicast message carries the multicast group information, and obtaining the multicast group information from the multicast message.
The method according to claim 4, wherein obtaining the multicast group information of the terminal device from the home gateway comprises:

Sending a query request for querying the multicast group message to the home gateway by extending the 1905 protocol;

receiving a query response returned by the home gateway, wherein the query response carries the multicast group message;

Obtain the multicast group message from the query response.
The method according to claim 4, wherein, before receiving the multicast message that the terminal device joins the network, the method further comprises:

receiving a general query sent by the home gateway to query the multicast group message of the terminal device;

Sending the general query to the terminal device.
A device roaming processing device under MESH networking, applied to the first routing device, including:

The first sending module is configured to send a notification message indicating a change in the networking topology to other routing devices and home gateways if it is detected that the second routing device or the first terminal device is roaming, so that the other routing devices and the home gateway The home gateway updates the locally stored networking topology, wherein the other routing devices are routing devices other than the first routing device;

An acquisition module configured to acquire multicast group information of a second terminal device or the first terminal device, wherein the second terminal device is a device that accesses the second routing device;

A providing module configured to provide a multicast data stream for the second terminal device or the first terminal device according to the multicast group information.
The device according to claim 7, wherein the device further comprises:

The first update module is configured to delete the hierarchical relationship between the second routing device and the home gateway from the locally stored network topology, and update the second routing device to the first routing device. level, to update the networking topology; or

The second update module is configured to delete the hierarchical relationship between the first terminal device and the third routing device accessed before roaming from the networking topology, and update the first terminal device to the first routing device level to update the networking topology.
A computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to perform the method described in any one of claims 1 to 6 when running.
An electronic device, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to perform the method described in any one of claims 1 to 6.