CN116527127A

CN116527127A - Communication recovery method, communication device and communication system

Info

Publication number: CN116527127A
Application number: CN202210081576.XA
Authority: CN
Inventors: 谌金豆; 李苗; 吴徐明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2023-08-01
Also published as: WO2023138328A1

Abstract

The application discloses a communication recovery method, a communication device and a communication system, relates to the field of optical fiber communication, and is used for realizing quick recovery of communication between terminal equipment and a communication network. The communication recovery method comprises the following steps: the control equipment receives fault indication information from the first access equipment, wherein the fault indication information is used for indicating the fault of the first access equipment; the control device determines a target candidate device from the plurality of candidate devices according to network performance information of the plurality of candidate devices, wherein the target candidate device has optimal network performance and is used for establishing communication with the first terminal device according to link information between the first access device and the first terminal device, the plurality of candidate devices comprise the control device and at least one access device outside the first access device controlled by the control device, and the first terminal device is a terminal device accessed to the first access device before the first access device fails.

Description

Communication recovery method, communication device and communication system

Technical Field

The present disclosure relates to the field of optical fiber communications, and in particular, to a communication recovery method, a communication device, and a communication system.

Background

With the popularization of home intelligent home appliances, remote education, video live broadcasting and Virtual Reality (VR), users have put forward higher demands on bandwidth, time delay and coverage performance of home wireless fidelity (wireless fidelity, wi-Fi), and on the basis that optical fiber to the home (fiber to the home, FTTH) has been widely popularized, the industry has recently put forward solutions for optical fiber to the room (fiber to the room, FTTR).

In an FTTR-based optical fiber communication system, an in-home optical fiber may be connected to a passive optical network (passive optical network, PON) gateway in a home, the PON gateway being responsible for managing optical network terminals (optical network terminal, ONTs) located in respective rooms, and terminal devices may access the communication network through the ONTs in the respective rooms, thereby implementing the FTTR.

When an ONT to which a terminal device is connected fails, the terminal device needs to reestablish a connection with other ONTs to continue to access the communication network, during which communication between the terminal device and the communication network is interrupted, and this process varies from hundreds of milliseconds to tens of seconds, and the time is long, thereby affecting the user experience.

Disclosure of Invention

The embodiment of the application provides a communication recovery method, a communication device and a communication system, which are used for realizing quick recovery of communication between terminal equipment and a communication network.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

in a first aspect, a communication recovery method is provided, including: the control equipment receives fault indication information from the first access equipment, wherein the fault indication information is used for indicating the fault of the first access equipment; the control device determines a target candidate device from the plurality of candidate devices according to network performance information of the plurality of candidate devices, wherein the target candidate device has optimal network performance and is used for establishing communication with the first terminal device according to link information between the first access device and the first terminal device, the plurality of candidate devices comprise the control device and at least one access device outside the first access device controlled by the control device, and the first terminal device is a terminal device accessed to the first access device before the first access device fails. The control device may be a PON gateway connected to an in-home fiber, and the access device may be an ONT located in each room managed by the PON gateway. Both the PON gateway and the ONT may be used for the terminal device to access (e.g., via Wi-Fi access) the fiber optic network in the home, thereby implementing FTTR.

According to the communication recovery method provided by the embodiment of the application, the target candidate device is used for backing up the link information between the first access device and the first terminal device accessed to the first access device, the target candidate device is the candidate device with the optimal network performance determined by the control device, and the target candidate device can be the control device or the second access device. When the first access equipment fails and the first terminal equipment cannot access the communication network, the target candidate equipment establishes communication with the first terminal equipment according to the backup link information, and the first terminal equipment does not need to pass the steps of authentication, connection establishment, interaction key and the like again in the process of establishing communication, so that the communication establishment time is shortened, the first terminal equipment can access the communication network through the target candidate equipment quickly, and the communication between the terminal equipment and the communication network is restored quickly.

In one possible embodiment, the network performance information includes signal strength and auxiliary network performance information of candidate devices, and the control device determines a target candidate device from the plurality of candidate devices according to the network performance information of the plurality of candidate devices, including: the control device determines at least one neighbor candidate device of the first access device from the plurality of candidate devices according to the signal strengths of the plurality of candidate devices; the control device determines a target candidate device from at least one neighbor candidate device based on the auxiliary network performance information of the neighbor candidate devices. The neighbor candidate device of the first access device refers to a neighbor candidate device which is closer to the first access device, and the reason for determining the neighbor candidate device of the first access device is as follows: the candidate device which is closer to the first access device is not far away from the first terminal device which has been previously accessed to the first access device, and the first terminal device can easily access the candidate device.

In one possible implementation, the auxiliary network performance information includes at least one of the following information: network parameters of candidate devices, loads of candidate devices, channel utilization of candidate devices, signal strength of interference signals detected by candidate devices, and signal strength of terminal devices accessed to candidate devices detected by candidate devices. The control device may set weights for each of the auxiliary network performance information of the one neighbor candidate device, and perform weight calculation on each of the auxiliary network performance information of the one neighbor candidate device to obtain a weight value of the candidate device, for example, multiply each of the auxiliary network performance information by the weight value, and then sum to obtain the weight value of the neighbor candidate device. The control device then determines a target candidate device from the at least one candidate device according to the weight value of the at least one neighbor candidate device, for example, takes the neighbor candidate device with the largest weight value as the target candidate device.

In one possible implementation, when the target candidate device is at least one access device, the method further comprises: the control device sends access indication information to the target candidate device, wherein the access indication information is used for indicating the target candidate device to establish communication with the first terminal device according to the link information, and the access indication information comprises the identification of the first terminal device. And after receiving the access indication information, the target candidate equipment acquires the identification of the first terminal equipment, rapidly reestablishes a link with the first terminal equipment according to the link information, and resumes communication between the first terminal equipment and the communication network.

In a possible implementation manner, the access indication information is carried in an access indication message, the access indication message includes an access indication message type field, a target candidate device identification field and a first terminal device identification field, the access indication message type field is used for indicating that the access indication message carries the access indication information, the target candidate device identification field is used for indicating the identification of the target candidate device, and the first terminal device identification field is used for indicating the identification of the first terminal device. This embodiment provides a structure of a message carrying access indication information.

In one possible implementation, when the target candidate device is at least one access device, before the control device sends the access indication information to the target candidate device, the method further comprises: the control device transmits link information to the target candidate device. And after receiving the access indication information, the target candidate equipment acquires the identification of the first terminal equipment, rapidly reestablishes a link with the first terminal equipment according to the link information, and resumes communication between the first terminal equipment and the communication network.

In one possible implementation, before the control device receives the fault indication information from the first access device, the method further comprises: the control device acquires link information. The control device may use the link information itself or may send it to other candidate devices.

In one possible implementation, the link information includes at least one of the following information: a communication key between the first access device and the first terminal device, a communication capability of the first terminal device, a message to establish a link between the first access device and the first terminal device. The communication key between the access device and the terminal device accessing the access device is obtained by the access device and the terminal device through the interactive key process, the communication capability of the terminal device accessing the access device is obtained by the access device and the terminal device through the authentication process, and the message of establishing the link between the access device and the terminal device accessing the access device is obtained by the access device and the terminal device through the connection establishment process.

In one possible implementation, the fault indication information is carried in a fault indication message, the fault indication message comprising a fault indication message type field for indicating that the fault indication message carries the fault indication information and a first access device identification field for indicating an identification of the first access device. This embodiment provides a structure of a message carrying fault indication information.

In one possible embodiment, the fault indication message further comprises a fault reason field for indicating a cause of the fault of the first access device. The field may represent different reasons by different values or the field may comprise a plurality of fields, each field representing a reason.

In one possible implementation, the cause includes a power loss or virtual access point anomaly. The embodiment of the application is not limited to the fault reasons.

In one possible embodiment, before the control device receives the fault indication information from the first access device, the method further includes: the control device obtains the identification of the first terminal device and the signal strengths of the plurality of candidate devices. The identity of the first terminal device is used to learn which terminal devices accessing the first access device will not be able to access the communication network through the first access device. The signal strengths of the candidate devices are used to determine which candidate devices are neighbor candidate devices to the first access device.

In one possible embodiment, the method further comprises: the control device changes the information of the first access device in the forwarding table into the information of the target candidate device. The message may be sent to the target candidate device according to the forwarding table when a message from the communication network is received, or the message may be sent to the communication network according to the forwarding table when a message from the target candidate device is received.

In one possible implementation, the indication information transmitted between the first access device or the target candidate device and the control device is carried in a custom message, or in a payload of an ethernet message, or in a payload of an optical network unit management control interface message. The embodiment of the application does not limit the message carrying the indication information.

In a second aspect, a communication recovery method is provided, including: the first access device sends link information between the first access device and first terminal device to the control device or the second access device, wherein the first terminal device is the terminal device accessed to the first access device; the first access device sends fault indication information to the control device, wherein the fault indication information is used for indicating the first access device to fail.

In one possible implementation, the link information includes at least one of the following information: a communication key between the first access device and the first terminal device, a communication capability of the first terminal device, a message to establish a link between the first access device and the first terminal device.

In one possible implementation, the fault indication information is carried in a fault indication message, the fault indication message comprising a fault indication message type field for indicating that the fault indication message carries the fault indication information and a first access device identification field for indicating an identification of the first access device.

In one possible embodiment, the fault indication message further comprises a fault reason field for indicating a cause of the fault of the first access device.

In one possible implementation, the cause includes a power loss or virtual access point anomaly.

In one possible implementation, before the first access device sends the fault indication information to the control device, the method further includes: the first access device sends the identity of the first terminal device and the signal strength of the other devices detected by the first access device to the control device.

In one possible implementation, before the first access device sends the fault indication information to the control device, the method further includes: the first access device sends at least one of the following information to the control device: network parameters of the first access device, load of the first access device, channel utilization of the first access device, signal strength of interference signals detected by the first access device, and signal strength of first terminal devices detected by the first access device.

In a possible implementation manner, the indication information transmitted between the first access device and the control device is carried in a custom message, or carried in a payload of an ethernet message, or carried in a payload of an optical network unit management control interface message.

In a third aspect, a communication recovery method is provided, including: the second access equipment acquires link information between the first access equipment and first terminal equipment, wherein the first terminal equipment is the terminal equipment accessed to the first access equipment; the second access device receives access indication information from the control device, wherein the access indication information is used for indicating the second access device to establish communication with the first terminal device according to the link information, and the access indication information comprises the identification of the first terminal device; the second access device establishes communication with the first terminal device indicated by the identification according to the link information.

In a possible implementation manner, the access indication information is carried in an access indication message, the access indication message includes an access indication message type field, a target candidate device identification field and a first terminal device identification field, the access indication message type field is used for indicating that the access indication message carries the access indication information, the target candidate device identification field is used for indicating the identification of the second access device, and the first terminal device identification field is used for indicating the identification of the first terminal device.

In one possible implementation manner, the second access device obtains link information between the first access device and the first terminal device, including: the second access device receives link information from the control device or the first access device.

In one possible implementation, before the second access device receives the access indication information from the control device, the method further comprises: the second access device sends the control device an identification of the terminal device accessing the second access device and the signal strength of the other devices detected by the second access device.

In one possible implementation, before the second access device receives the access indication information from the control device, the method further comprises: the second access device sends at least one of the following information to the control device: network parameters of the second access device, load of the second access device, channel utilization of the second access device, signal strength of interference signals detected by the second access device, and signal strength of terminal devices accessed to the second access device detected by the second access device.

In a possible implementation, the access indication information is carried in a custom message, or in a payload of an ethernet message, or in a payload of an optical network unit management control interface message.

In a fourth aspect, there is provided a communications device comprising a processor and a transceiver for communicating with other communications devices, the method of the first aspect and any of its embodiments being performed when the processor executes instructions.

In a fifth aspect, there is provided a communications device comprising a processor and a transceiver for communicating with other communications devices, the method of the second aspect and any of its embodiments being performed when the processor executes instructions.

In a sixth aspect, there is provided a communications device comprising a processor and a transceiver for communicating with other communications devices, the method of the third aspect and any of its embodiments being performed when the processor executes instructions.

In a seventh aspect, a communication device is provided that includes a processing module and a transceiver module. The receiving and transmitting module is used for receiving fault indication information from the first access equipment, and the fault indication information is used for indicating the fault of the first access equipment; the processing module is used for determining target candidate equipment from the plurality of candidate equipment according to network performance information of the plurality of candidate equipment, the network performance of the target candidate equipment is optimal, the target candidate equipment is used for establishing communication with the first terminal equipment according to link information between the first access equipment and the first terminal equipment, the plurality of candidate equipment comprises a control equipment and at least one access equipment outside the first access equipment controlled by the control equipment, and the first terminal equipment is the terminal equipment accessed to the first access equipment before the first access equipment fails.

In a possible implementation manner, the processing module is specifically configured to: determining at least one neighbor candidate device of the first access device from the plurality of candidate devices according to the signal strengths of the plurality of candidate devices; and determining the target candidate device from at least one neighbor candidate device according to the auxiliary network performance information of the neighbor candidate device.

In a possible implementation manner, when the target candidate device is at least one access device, the transceiver module is further configured to send access indication information to the target candidate device, where the access indication information is used to instruct the target candidate device to establish communication with the first terminal device according to the link information, and the access indication information includes an identifier of the first terminal device.

In a possible implementation, when the target candidate device is at least one access device, the transceiver module is further configured to send the link information to the target candidate device before sending the access indication information to the target candidate device.

In a possible implementation manner, the transceiver module is further configured to obtain the link information before the control device receives the fault indication information from the first access device.

In a possible implementation manner, the transceiver module is further configured to obtain, before receiving the fault indication information from the first access device, an identification of the first terminal device and signal strengths of the plurality of candidate devices.

In one possible implementation, the processing module changes the information of the first access device in the forwarding table to the information of the target candidate device.

In an eighth aspect, a communication device is provided that includes a processing module and a transceiver module. The receiving and transmitting module is used for transmitting link information between the first access equipment and the first terminal equipment to the control equipment or the second access equipment, wherein the first terminal equipment is the terminal equipment accessed to the first access equipment; and sending fault indication information to the control equipment, wherein the fault indication information is used for indicating the fault of the first access equipment.

In a possible implementation manner, the transceiver module is further configured to send, to the control device, the identity of the first terminal device and the signal strength of the other device detected by the first access device, before the first access device sends the fault indication information to the control device.

In a possible implementation manner, the transceiver module is further configured to, before the first access device sends the failure indication information to the control device, send at least one of the following information to the control device: network parameters of the first access device, load of the first access device, channel utilization of the first access device, signal strength of interference signals detected by the first access device, and signal strength of first terminal devices detected by the first access device.

In a ninth aspect, a communication device is provided that includes a processing module and a transceiver module. The receiving and transmitting module is used for acquiring link information between first access equipment and first terminal equipment, wherein the first terminal equipment is terminal equipment accessed to the first access equipment; receiving access indication information from the control device, wherein the access indication information is used for indicating the second access device to establish communication with the first terminal device according to the link information, and the access indication information comprises the identification of the first terminal device; and the processing module is used for establishing communication with the first terminal equipment indicated by the identification according to the link information.

In a possible embodiment, the transceiver module is specifically configured to receive the link information from the control device or the first access device.

In a possible implementation manner, the transceiver module is further configured to send, to the control device, before the second access device receives the access indication information from the control device, an identification of a terminal device accessing the second access device and a signal strength of other devices detected by the second access device.

In a possible implementation manner, the transceiver module is further configured to, before the second access device receives the access indication information from the control device, send at least one of the following information to the control device: network parameters of the second access device, load of the second access device, channel utilization of the second access device, signal strength of interference signals detected by the second access device, and signal strength of terminal devices accessed to the second access device detected by the second access device.

A tenth aspect provides a communication system comprising a communication device according to the third aspect, a communication device according to the fourth aspect, and a communication device according to the fifth aspect; or comprises a communication device according to the sixth aspect and any of the embodiments thereof, a communication device according to the seventh aspect and any of the embodiments thereof, and a communication device according to the eighth aspect and any of the embodiments thereof.

In an eleventh aspect, a computer readable storage medium is provided, the computer readable storage medium comprising instructions which, when run on a communication device as described above, cause the communication device to perform the method according to the first aspect and any of its embodiments, or to perform the method according to the second aspect and any of its embodiments, or to perform the method according to the third aspect and any of its embodiments.

In a twelfth aspect, there is provided a computer program product comprising instructions which, when run on a communication device as described above, cause the communication device to perform a method as described in the first aspect and any of its embodiments, or to perform a method as described in the second aspect and any of its embodiments, or to perform a method as described in the third aspect and any of its embodiments.

The technical effects of the second to twelfth aspects are referred to the technical effects of the first aspect and any of its embodiments and are not repeated here.

Drawings

FIG. 1 is a schematic diagram of an optical fiber communication system;

fig. 2 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 3 is a schematic flow chart of a communication recovery method according to an embodiment of the present application;

Fig. 4 is a schematic diagram of a message structure carrying fault indication information and fault cause information according to an embodiment of the present application;

fig. 5 is a flow chart of another communication recovery method according to an embodiment of the present application;

fig. 6 is a schematic diagram of a message structure for carrying access indication information according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a chip system according to an embodiment of the present application.

Detailed Description

It should be noted that the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between the same type of feature, and not to be construed as indicating a relative importance, quantity, order, or the like.

The terms "exemplary" or "such as" and the like, as used in connection with embodiments of the present application, are intended to be exemplary, or descriptive. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

A virtual access point (virtual access point, VAP) refers to a plurality of APs virtualized on a physical Access Point (AP), each virtual AP being a VAP, each VAP providing the same functionality as a physical AP. Different VAPs may provide wireless access services for different groups of users (e.g., family members or guests).

Fig. 1 shows a fiber optic communication system applicable to a gigabit passive optical network (gigabit passive optical network, GPON) comprising an optical line terminal (optical line terminal, OLT) 11, a PON gateway 12, at least one ONT13 and a terminal device 14. The OLT 11 is connected to the PON gateway 12 through an in-home optical fiber, the OLT 11 is configured to connect an optical fiber network in a home to a backbone optical fiber network (i.e., a communication network related to the present application) through the PON gateway 12, the PON gateway 12 is configured to manage an ONT13 in the home, the ONT13 and the PON gateway 12 are connected through optical fibers, and the ONT13 may be located in each room. Both PON gateway 12 and ONT13 may provide for terminal device 14 to access (e.g., via Wi-Fi access) a fiber optic network in the home, thereby implementing FTTR.

The optical fiber communication system can adopt various backup technologies to avoid network interruption:

Type a (type a) performs backup protection only on network devices in the backbone optical fiber network, and does not perform backup on the OLT11, PON gateway 12, ONT 13. The backup mode has backup effect on breakpoints of the backbone optical fiber network, but has no backup effect on network interruption caused by faults of the OLT11, the PON gateway 12 and the ONT 13.

Type B (type B) simultaneously backs up the OLT11 and network equipment of the backbone fiber, but does not back up the PON gateway 12, ONT 13. The most commonly employed solution is to integrate cost and performance.

Type C (type C) backs up the OLT11, the PON gateway 12, the ONT 13 and network equipment in the backbone optical fiber network, any fault in the network can be avoided by switching to the backup network equipment, and the reliability is high; but networking is very complex and very costly due to the large number of network devices.

Type D (type D) backs up the entire network, further improving reliability, but networking complexity is higher and cold backup is needed to prevent primary and backup signal collision.

These backup techniques can ensure link recovery of the downlink data, but cannot achieve rapid recovery of the communication failure between the terminal device 14 and the ONT 13. If communication between the terminal device 14 and the ONT 13 is to be restored, the following steps are also required: the terminal device 14 finds out that the connected ONT 13 is faulty. The terminal device 14 detects a new ONT 13. The terminal device 14 can normally communicate with the ONT 13 after acquiring an internet protocol (internet protocol, IP) address, etc. of the new ONT 13 through a series of procedures such as authentication, connection establishment, and interaction key. This process varies from hundreds of milliseconds to tens of seconds, and is long, thereby affecting the user experience.

Therefore, the embodiments of the present application provide a communication restoration method, a communication apparatus, and a communication system, where a control device (for example, the PON gateway 12 described above) or a second access device (for example, the ONT 13 described above) backs up link information between a first access device (for example, another ONT 13) and a terminal device accessing the first access device, and when the first access device fails and causes the terminal device accessing the first access device to fail to access the communication network, the second access device or the control device establishes communication with the terminal device according to the backed-up link information, and in the process of establishing communication, the terminal device does not need to go through authentication, connection establishment, and an interaction key again, so that the communication establishment time is shortened, and the terminal device can access the communication network through the second access device or the control device quickly, thereby implementing quick restoration of communication between the terminal device and the communication network.

As shown in fig. 2, the embodiment of the present application provides a communication system including a control device 21, at least one access device (e.g., a first access device 22 and a second access device 23), and at least one terminal device 24. The terminal device 24 may access the communication network through the control device 21 or the access device. In the FTTR communication system, the control device 21 may be a PON gateway as described above, and the access device may be an ONT as described above; alternatively, in a cascaded wired communication system or a wireless communication (e.g., wi-Fi) communication system, the control device 21 may be a communication device of a previous stage, and the access device may be a communication device of a next stage; alternatively, in a communication system including a master communication device and a slave communication device, the control device 21 may be the master communication device and the access device may be the slave communication device.

As shown in fig. 3, an embodiment of the present application provides a communication recovery method, including steps S101 to S105:

s101, the control device acquires network performance information of a plurality of candidate devices.

The plurality of candidate devices comprises the control device itself and at least one access device (e.g. the first access device and the second access device as described above), that is, both the control device and the at least one access device may establish communication with the terminal device such that the terminal device can access the communication network through the control device or the access device. In FTTR communication systems, candidate devices in the same home network may communicate with the terminal device using the same broadcast service set identification (broadcast service set identifier, BSSID) (e.g., media access control (media access control, MAC) address), capability set information, and information derived from the MAC address, such as a communication key.

When the candidate device is not the control device itself, i.e. the candidate device is at least one access device, the at least one access device may send network performance information of the present access device to the control device. When the candidate device is the control device itself, the control device may be configured with network performance information or obtain the network performance information by monitoring the network environment.

The network performance information of the candidate device (e.g., the control device, the first access device, or the second access device) includes a signal strength (e.g., a received signal strength indication (received signal strength indication, RSSI)) of the candidate device, an identification of a terminal device accessing the candidate device, and auxiliary network performance information.

The signal strength of the candidate device may be the signal strength of another candidate device detected by one candidate device, for example, the signal strength of a second access device detected by a first access device, the signal strength of a control device detected by a first access device, the signal strength of a first access device detected by a second access device, the signal strength of a control device detected by a second access device, the signal strength of a first access device detected by a control device, the signal strength of a second access device detected by a control device.

The identity of the terminal device of the access candidate device may be an allocation identity (allocation ID).

The auxiliary network performance information includes at least one of the following: network parameters of the candidate device (e.g., channel, bandwidth, etc.), load of the candidate device (e.g., number of terminal devices accessing the candidate device, average data traffic, etc.), channel utilization of the candidate device, signal strength (e.g., RSSI) of an interference signal detected by the candidate device (e.g., an interference signal generated by a device such as a microwave oven, a hair dryer, etc.), and signal strength (e.g., RSSI) of a terminal device accessed by the candidate device.

S102, the access device (e.g., the first access device and the second access device described above) sends the link information of the access device to other candidate devices.

The link information of the access device refers to link information between the access device and a terminal device accessing the access device. The link information includes at least one of the following information: a communication key between an access device and a terminal device accessing the access device, a communication capability of the terminal device accessing the access device (e.g., supported maximum rate, supported communication protocol), a message to establish a link between the access device and the terminal device accessing the access device (e.g., probe request message, authentication request (authentication request) message, association request (association request) message, re-association request (reassociation request) message, etc.). The communication key between the access equipment and the terminal equipment accessed to the access equipment is obtained by the access equipment and the terminal equipment through an interactive key process, the communication capability of the terminal equipment accessed to the access equipment is obtained by the access equipment and the terminal equipment through an authentication process, and the message for establishing a link between the access equipment and the terminal equipment accessed to the access equipment is obtained by the access equipment and the terminal equipment through a connection establishment process.

The timing of the access device transmitting the link information may include: after the access equipment starts working; or when the terminal device accessing the access device changes, for example, a new terminal device accesses the terminal device, and the terminal device that has accessed the access device disconnects from the access device, etc.

In one possible implementation, the link information may be sent directly to other candidate devices. For example, the first access device may send the link information of the present access device (the first access device) to other candidate devices (the second access device and the control device) by means of mass-sending, or the first access device may send the link information of the present access device (the first access device) to the other candidate devices (the second access device and the control device) alone. For another example, the second access device may send the link information of the present access device (the second access device) to other candidate devices (the first access device and the control device) by means of mass-sending, or the second access device may send the link information of the present access device (the second access device) to the other candidate devices (the first access device and the control device) alone.

In another possible implementation, the link information may be indirectly sent to other candidate devices through forwarding by the control device. For example, the first access device may send the link information of the present access device (first access device) to the control device, and the control device sends the link information of the first access device to the second access device. For another example, the second access device may send the link information of the present access device (second access device) to the control device, and the control device sends the link information of the second access device to the first access device.

It should be noted that, when the control device receives the link information from one access device, the control device does not send the link information to other access devices, but uses the link information itself, or the control device may send the link information to other access devices later, or the control device may wait for a certain condition to be met and send the link information to other access devices, so as to save network transmission resources. For example, when the access device transmitting the link information fails, the control device may transmit the link information to other access devices; or when the network is not busy, the control device can send link information to other access devices; alternatively, after the target candidate device is determined in the following step S104, the control device may transmit link information to the target candidate device.

And S103, when the first access device fails, the first access device sends failure indication information to the control device.

Accordingly, the control device receives the failure indication information from the first access device. The fault indication information is used for indicating that the first access device fails, that is, the first terminal device that has been accessed to the first access device before the failure can not access the communication network through the first access device any more, the first terminal device may be one terminal device or a plurality of terminal devices, or may be all terminal devices or part of terminal devices that have been accessed to the first access device, where for convenience of description, the first terminal device refers to one terminal device unless otherwise specified.

The chip of the first access device may generate a power failure warning (power failure warning) signal (for example, about 100ms before stopping working) after detecting that power failure occurs (for example, detecting that power supply voltage is insufficient), or a module is in the chip to determine whether the current VAP is in an abnormal state (i.e., the VAP cannot provide access service). Therefore, the first access device may also send failure cause information to the control device, and accordingly, the control device receives the failure cause information from the first access device. The failure cause information is used to indicate the cause of the failure of the first access device, and specific causes include, but are not limited to, power failure or VAP abnormality.

The fault indication information and the fault cause information may be transmitted in the same message or in different messages, and the present application uses the transmission in the same message as an example, but is not limited thereto. The fault indication information and the fault cause information may be carried in custom messages as shown in fig. 4 a, or in the header of an ethernet message as shown in fig. 4B, or in an optical network unit management control interface (ONU management and control interface, OMCI) message as shown in fig. 4C.

The messages carrying the fault indication information and the fault cause information may be collectively referred to as fault indication messages. The fault indication message may include a fault indication message type field and a first access device identification field. The fault indication message type field is used for indicating that the fault indication message is used for bearing fault indication information, and optionally, is also used for indicating that the fault indication message is used for bearing fault reason information; the first access device identification field is used for the identification of the first access device (i.e. indicating which access device failed), which may be, for example, an index of the ONT; these two fields combine to represent fault indication information. Optionally, the fault indication message may further include a fault cause field for indicating the cause of the fault of the first access device, i.e. the field may be used to represent fault cause information, the field may represent different causes by different values, or the field may include a plurality of fields, each field representing one cause, e.g. one field representing the cause of a power loss and another field representing the cause of a VAP anomaly. Optionally, the fault indication message may also include a reserved field, which may be used for future extensions (e.g., an extended fault cause field).

S104, the control equipment determines target candidate equipment from the plurality of candidate equipment according to the network performance information from the plurality of candidate equipment.

The target candidate device may be a candidate device with optimal network performance, the target candidate device may be the control device itself, or may be another access device (e.g., a second access device) than the first access device. The purpose of determining the target candidate device is to enable the first terminal device to access the communication network through the candidate device. As shown in fig. 5, step S104 includes S1041-S1042.

S1041, the control device determines at least one neighbor candidate device of the first access device from the plurality of candidate devices according to signal strengths of the plurality of candidate devices (network performance information from the plurality of candidate devices described above).

I.e. the neighbor candidate device of the first access device may be more than one. The more distant a contralateral device (e.g., one candidate device) is from a home lateral device (e.g., another candidate device), the weaker the signal strength of the contralateral device detected by the home lateral device is, and the stronger the signal strength of the contralateral device detected by the home lateral device is when the contralateral device is closer to the home lateral device, so the signal strength of the contralateral device detected by the home lateral device can characterize the distance between the contralateral device and the home lateral device. The neighbor candidate device of the first access device refers to a neighbor candidate device which is closer to the first access device, and the reason for determining the neighbor candidate device of the first access device is as follows: the candidate device which is closer to the first access device is not far away from the first terminal device which has been previously accessed to the first access device, and the first terminal device can easily access the candidate device.

In one possible implementation, as described above, the signal strength of the candidate device may be the signal strength of another candidate device detected by one candidate device, so that the first access device may detect the signal strengths of multiple candidate devices (e.g., the control device and the second access device), and the control device may regard the candidate device whose signal strength detected by the first access device exceeds the first threshold as the neighbor candidate device of the first access device. That is, the control device may select "a candidate device whose signal detected by the first access device is good" as a neighbor candidate device of the first access device.

In another possible implementation manner, since the first access device may detect the signal strength of the other candidate device, the other candidate device may also detect the signal strength of the first access device, that is, the two candidate devices may detect the signal strength of each other, so the control device may also select, when detecting the signal strength of the first access device, a candidate device that detects that the signal strength of the first access device exceeds the second threshold as a neighbor candidate device of the first access device. That is, the control device may select "a candidate device that detects the signal of the first access device better" as a neighbor candidate device of the first access device. Wherein the first threshold and the second threshold may be the same or different.

In yet another possible embodiment, the two embodiments may be combined, for example, the control device may further screen candidate devices with signal strength detected by the first access device exceeding the first threshold, and select a candidate device with signal strength detected by the first access device exceeding the second threshold as a neighboring candidate device of the first access device. That is, the control device may select "candidate devices that have good signal strengths for mutually detecting each other with the first access device" as neighbor candidate devices of the first access device.

S1042, the control device determines a target candidate device from at least one neighbor candidate device according to the auxiliary network performance information of the neighbor candidate device.

The control device may set weights for each of the auxiliary network performance information of the one neighbor candidate device, and perform weight calculation on each of the auxiliary network performance information of the one neighbor candidate device to obtain a weight value of the candidate device, for example, multiply each of the auxiliary network performance information by the weight value, and then sum to obtain the weight value of the neighbor candidate device. The control device then determines a target candidate device from the at least one candidate device according to the weight value of the at least one neighbor candidate device, for example, takes the neighbor candidate device with the largest weight value as the target candidate device.

It should be noted that the target candidate device is unique to one first terminal device, but the target candidate device may not be unique to a plurality of first terminal devices, i.e. different first terminal devices may establish communication with different target candidate devices, thereby accessing the communication network through different target candidate devices.

Optionally, the control device may further change the information of the first access device in the forwarding table to the information of the target candidate device, for example, change the identifier of the interface (interface) in the forwarding table from the identifier of the first access device to the identifier of the target candidate device, so as to change the data forwarding path from the first access device to the target candidate device. The message may be sent to the target candidate device according to the forwarding table when a message from the communication network is received, or the message may be sent to the communication network according to the forwarding table when a message from the target candidate device is received.

S105, the target candidate device establishes communication with the first terminal device according to the link information between the first access device and the first terminal device.

As shown in fig. 5, when the target candidate device is a control device, step S105 includes step S1051, and when the target candidate device is not a control device, i.e., when the target candidate device is at least one access device (e.g., a second access device) other than the first access device, step S105 includes steps S1052 to S1053.

S1051, the control device establishes communication with the first terminal device according to the link information between the first access device and the first terminal device.

As described above, the communication key between the access device and the terminal device accessing the access device in the link information is obtained by the access device and the terminal device through the interactive key process, the communication capability of the terminal device accessing the access device is obtained by the access device and the terminal device through the authentication process, and the message for establishing the link between the access device and the terminal device accessing the access device is obtained by the access device and the terminal device through the connection establishment process. Therefore, the control device can save the process of the interaction key between the control device and the first terminal device by acquiring the communication key between the first access device and the first terminal device, the process of authentication between the control device and the first terminal device by acquiring the communication capability of the first terminal device, and the process of connection between the control device and the first terminal device by acquiring the message of establishing the link between the first access device and the first terminal device.

Therefore, the control device can quickly reestablish the link with the first terminal device according to the link information, and resume the communication between the first terminal device and the communication network.

S1052, the control device transmits access instruction information to the target candidate device (e.g., the second access device).

The access indication information comprises an identifier of the first terminal device, and is used for indicating the target candidate device to establish communication with the first terminal device according to the link information between the first access device and the first terminal device.

The access indication information may be carried in a custom message as shown in fig. 6 a, or in a header of an ethernet message as shown in fig. 6B, or in an OMCI message as shown in fig. 6C, or in a PLOAM message.

The messages carrying access indication information may be collectively referred to as access indication messages. The access indication message may include an access indication message type field, a target candidate device identification field, and a first terminal device identification field. The access indication message type field is used for indicating that the access indication message bears access indication information; the target candidate device identification field is used to indicate the identification of the target candidate device, i.e. to indicate to which candidate device (actually the access device) the third message is sent, and for example, the identification of the target candidate device may be an index of the ONT; the first terminal device identification field is used for indicating the identification of the first terminal device, i.e. for indicating with which terminal devices the target candidate device is to establish communication; optionally, the access indication message further comprises a reserved field for future expansion (e.g. expanding the first terminal device identification field to increase the number of indicated first terminal device identifications).

S1053, the second access device establishes communication with the first terminal device indicated by the identification of the first terminal device according to the link information from the first access device.

After receiving the access indication information, the second access device obtains the identifier of the first terminal device from the access indication information, and similar to the control device in step S1051, the second access device may quickly reestablish a link with the first terminal device according to the link information, and resume communication between the first terminal device and the communication network.

After the first terminal device successfully accesses the second access device, the second access device may send indication information to the control device to indicate that the first terminal device successfully accesses the second access device.

According to the communication recovery method, the communication device and the communication system provided by the embodiment of the application, the target candidate device is used for backing up the link information between the first access device and the first terminal device accessed to the first access device, the target candidate device is the candidate device with the optimal network performance determined by the control device, and the target candidate device can be the control device or the second access device. When the first access equipment fails and the first terminal equipment cannot access the communication network, the target candidate equipment establishes communication with the first terminal equipment according to the backup link information, and the first terminal equipment does not need to pass the steps of authentication, connection establishment, interaction key and the like again in the process of establishing communication, so that the communication establishment time is shortened, the first terminal equipment can access the communication network through the target candidate equipment quickly, and the communication between the terminal equipment and the communication network is restored quickly.

It will be appreciated that in the various embodiments above, the methods and/or steps implemented by the control device may also be implemented by a component (e.g., a chip or circuit) of the control device. The methods and/or steps implemented by the first access device may also be implemented by a component (e.g., a chip or circuit) of the first access device. The methods and/or steps implemented by the second access device may also be implemented by a component (e.g., a chip or circuit) of the second access device.

The embodiment of the application also provides a communication device. The communication device may be the control device in the above method embodiment, or a device including the control device, or a chip or a functional module in the control device. Alternatively, the communication apparatus may be the first access device in the above method embodiment, or an apparatus including the first access device, or a chip or a functional module in the first access device. Alternatively, the communication apparatus may be the second access device in the foregoing method embodiment, or an apparatus including the second access device, or a chip or a functional module in the second access device. Thereby realizing the various methods.

It will be appreciated that the communication device, in order to achieve the above-described functions, comprises corresponding hardware structures and/or software modules performing the respective functions. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application may divide the functional modules of the communication device according to the embodiment of the method, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

Fig. 7 shows a schematic structural diagram of a communication device 20. The communication device 20 comprises a processing module 201 and a transceiver module 202. The communication means 20 may be a control device, a first access device or a second access device as described above. The processing module 201 may also be referred to as a processing unit, and is configured to implement the processing functions of the control device, the first access device, or the second access device in the foregoing method embodiments. For example, steps S104 and S105 in fig. 3 are executed, and steps S1041, S1042, S1051, and S1053 in fig. 5 are executed. The transceiver module 202, which may also be referred to as a transceiver unit, is configured to implement the transceiver function of the control device, the first access device, or the second access device in the above-described method embodiment. For example, steps S101 to S103 in fig. 3 are performed, and steps S101 to S103 and S1052 in fig. 5 are performed. Transceiver module 202 may be referred to as a transceiver circuit, transceiver, or communication interface.

Taking the communication device 20 as an example of the control apparatus in the above-described method embodiment.

In one possible implementation, the transceiver module 202 is configured to receive fault indication information from the first access device, where the fault indication information is configured to indicate that the first access device is faulty; the processing module 201 is configured to determine a target candidate device from a plurality of candidate devices according to network performance information of the plurality of candidate devices, where the network performance of the target candidate device is optimal, and the target candidate device is configured to establish communication with a first terminal device according to link information between the first access device and the first terminal device, where the plurality of candidate devices include a control device and at least one access device other than the first access device controlled by the control device, and the first terminal device is a terminal device that accesses the first access device before the first access device fails.

In one possible implementation, the processing module 201 is specifically configured to: determining at least one neighbor candidate device of the first access device from the plurality of candidate devices according to the signal strengths of the plurality of candidate devices; and determining the target candidate device from at least one neighbor candidate device according to the auxiliary network performance information of the neighbor candidate device.

In a possible implementation manner, when the target candidate device is at least one access device, the transceiver module 202 is further configured to send access indication information to the target candidate device, where the access indication information is used to instruct the target candidate device to establish communication with the first terminal device according to the link information, and the access indication information includes an identifier of the first terminal device.

In a possible implementation, when the target candidate device is at least one access device, the transceiver module 202 is further configured to send the link information to the target candidate device before sending the access indication information to the target candidate device.

In a possible implementation, the transceiver module 202 is further configured to obtain the link information before the control device receives the failure indication information from the first access device.

In a possible implementation manner, the transceiver module 202 is further configured to obtain, before receiving the fault indication information from the first access device, the identity of the first terminal device and the signal strengths of the plurality of candidate devices.

In one possible implementation, the processing module 201 changes the information of the first access device in the forwarding table to the information of the target candidate device.

Taking the communication apparatus 20 as the first access device in the above-mentioned method embodiment as an example.

In a possible implementation manner, the transceiver module 202 is configured to send, to the control device or the second access device, link information between the first access device and the first terminal device, where the first terminal device is a terminal device accessing the first access device; and sending fault indication information to the control equipment, wherein the fault indication information is used for indicating the fault of the first access equipment.

In a possible implementation manner, the transceiver module 202 is further configured to send, to the control device, the identity of the first terminal device and the signal strength of the other devices detected by the first access device, before the first access device sends the fault indication information to the control device.

In a possible implementation manner, the transceiver module 202 is further configured to, before the first access device sends the failure indication information to the control device, send at least one of the following information to the control device: network parameters of the first access device, load of the first access device, channel utilization of the first access device, signal strength of interference signals detected by the first access device, and signal strength of first terminal devices detected by the first access device.

In a possible implementation manner, the transceiver module 202 is configured to obtain link information between a first access device and a first terminal device, where the first terminal device is a terminal device accessing the first access device; receiving access indication information from the control device, wherein the access indication information is used for indicating the second access device to establish communication with the first terminal device according to the link information, and the access indication information comprises the identification of the first terminal device; a processing module 202 is configured to establish communication with the first terminal device indicated by the identifier according to the link information.

In a possible implementation, the transceiver module 202 is specifically configured to receive the link information from the control device or the first access device.

In a possible implementation manner, the transceiver module 202 is further configured to send, to the control device, before the second access device receives the access indication information from the control device, an identification of a terminal device accessing the second access device and a signal strength of other devices detected by the second access device.

In a possible implementation manner, the transceiver module 202 is further configured to, before the second access device receives the access indication information from the control device, send at least one of the following information to the control device: network parameters of the second access device, load of the second access device, channel utilization of the second access device, signal strength of interference signals detected by the second access device, and signal strength of terminal devices accessed to the second access device detected by the second access device.

As shown in fig. 8, the embodiment of the application further provides a communication device. The communication device 30 comprises a processor 301, a memory 302 and a transceiver 303, the processor 301 being coupled to the memory 302 and the transceiver 303, the transceiver 303 being for supporting the communication device to communicate with other communication devices. When the processor 301 executes the computer programs or instructions in the memory 302, the corresponding method of the control device, the first access device or the second access device of fig. 3 or 5 is performed.

As shown in fig. 9, the embodiment of the application further provides a chip system. The chip system 40 includes at least one processor 401 and at least one interface circuit 402. The at least one processor 401 and the at least one interface circuit 402 may be interconnected by wires. For example, at least one interface circuit 402 may be used to receive signals from other devices (e.g., memory) or to transmit signals to other communication devices (e.g., communication interfaces).

Embodiments of the present application also provide a computer-readable storage medium including instructions that, when executed on the above-described communication apparatus, cause the communication apparatus to perform the functions or steps performed by the control device, the first access device, or the second access device in the above-described method embodiments, for example, performing the method shown in fig. 3 or fig. 5.

Embodiments of the present application also provide a computer program product comprising instructions which, when run on the above-described communication apparatus, cause the communication apparatus to perform the respective functions or steps performed by the control device, the first access device or the second access device in the above-described method embodiments, for example performing the method shown in fig. 3 or fig. 5.

Technical effects concerning the communication apparatus, the computer-readable storage medium, the computer program product refer to technical effects of the previous method embodiments.

The processor referred to in the embodiments of the present application may be a chip. For example, it may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

The memory to which embodiments of the present application relate may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system, apparatus and module may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, e.g., the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple modules or components may be combined or integrated into another device, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.

The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physically separate, i.e., may be located in one device, or may be distributed over multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present application may be integrated in one device, or each module may exist alone physically, or two or more modules may be integrated in one device.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., a floppy Disk, a hard Disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A communication restoration method, comprising:

the control equipment receives fault indication information from first access equipment, wherein the fault indication information is used for indicating the first access equipment to fail;

the control device determines a target candidate device from a plurality of candidate devices according to network performance information of the plurality of candidate devices, wherein the network performance of the target candidate device is optimal, and the target candidate device is used for establishing communication with the first terminal device according to link information between the first access device and the first terminal device, wherein the plurality of candidate devices comprise the control device and at least one access device which is controlled by the control device and is outside the first access device, and the first terminal device is a terminal device which is accessed to the first access device before the first access device fails.

2. The method of claim 1, wherein the network performance information includes signal strength and auxiliary network performance information for the candidate devices, and wherein the control device determines a target candidate device from the plurality of candidate devices based on the network performance information for the plurality of candidate devices, comprising:

the control device determines at least one neighbor candidate device of the first access device from the plurality of candidate devices according to the signal strengths of the plurality of candidate devices;

the control device determines the target candidate device from the at least one neighbor candidate device according to the auxiliary network performance information of the neighbor candidate device.

3. The method of claim 2, wherein the auxiliary network performance information comprises at least one of: the network parameters of the candidate equipment, the load of the candidate equipment, the channel utilization rate of the candidate equipment, the signal strength of the interference signals detected by the candidate equipment and the signal strength of the terminal equipment accessed to the candidate equipment.

4. A method according to any of claims 1-3, wherein when the target candidate device is the at least one access device, the method further comprises:

The control device sends access indication information to the target candidate device, wherein the access indication information is used for indicating the target candidate device to establish communication with the first terminal device according to the link information, and the access indication information comprises the identification of the first terminal device.

5. The method of claim 4, wherein the access indication information is carried in an access indication message, the access indication message comprising an access indication message type field, a target candidate device identification field, and a first terminal device identification field, the access indication message type field being used to indicate that the access indication message carries the access indication information, the target candidate device identification field being used to indicate an identification of the target candidate device, and the first terminal device identification field being used to indicate an identification of the first terminal device.

6. The method according to claim 4 or 5, wherein when the target candidate device is the at least one access device, before the control device sends access indication information to the target candidate device, the method further comprises:

the control device transmits the link information to the target candidate device.

7. The method according to any of claims 1-6, wherein before the control device receives the failure indication information from the first access device, the method further comprises:

and the control equipment acquires the link information.

8. The method according to any of claims 1-7, wherein the link information comprises at least one of the following information: a communication key between the first access device and the first terminal device, a communication capability of the first terminal device, and a message for establishing a link between the first access device and the first terminal device.

9. The method according to any of claims 1-8, wherein the fault indication information is carried in a fault indication message, the fault indication message comprising a fault indication message type field for indicating that the fault indication message carries the fault indication information and a first access device identification field for indicating an identification of the first access device.

10. The method of claim 9, wherein the fault indication message further comprises a fault reason field for indicating a cause of the first access device fault.

11. The method of claim 10, wherein the cause comprises a power loss or a virtual access point anomaly.

12. The method according to any of claims 1-11, further comprising, before the control device receives the failure indication information from the first access device:

the control device obtains the identification of the first terminal device and the signal strengths of the plurality of candidate devices.

13. The method according to any one of claims 1-12, further comprising:

and the control equipment changes the information of the first access equipment in the forwarding table into the information of the target candidate equipment.

14. The method according to any of claims 1-13, wherein the indication information transmitted between the first access device or the target candidate device and the control device is carried in a custom message, or in a payload of an ethernet message, or in a payload of an optical network unit management control interface message.

15. A communication restoration method, comprising:

the first access device sends link information between the first access device and first terminal device to control device or second access device, wherein the first terminal device is the terminal device accessed to the first access device;

The first access device sends fault indication information to the control device, wherein the fault indication information is used for indicating the first access device to fail.

16. The method of claim 15, wherein the link information comprises at least one of: a communication key between the first access device and the first terminal device, a communication capability of the first terminal device, and a message for establishing a link between the first access device and the first terminal device.

17. The method according to any of claims 15-16, wherein the fault indication information is carried in a fault indication message, the fault indication message comprising a fault indication message type field for indicating that the fault indication message carries the fault indication information and a first access device identification field for indicating an identification of the first access device.

18. The method of claim 17, wherein the fault indication message further comprises a fault reason field for indicating a cause of the first access device fault.

19. The method of claim 18, wherein the cause comprises a power loss or a virtual access point anomaly.

20. The method according to any of claims 15-19, wherein before the first access device sends the failure indication information to the control device, the method further comprises:

the first access device sends the identification of the first terminal device and the signal strength of other devices detected by the first access device to the control device.

21. The method according to any of claims 15-20, wherein before the first access device sends the failure indication information to the control device, the method further comprises:

the first access device sends at least one of the following information to the control device: the network parameters of the first access equipment, the load of the first access equipment, the channel utilization rate of the first access equipment, the signal strength of the interference signal detected by the first access equipment and the signal strength of the first terminal equipment detected by the first access equipment.

22. The method according to any of claims 15-21, wherein the indication information transmitted between the first access device and the control device is carried in a custom message, or in a payload of an ethernet message, or in a payload of an optical network unit management control interface message.

23. A communication restoration method, comprising:

the method comprises the steps that a second access device obtains link information between a first access device and a first terminal device, wherein the first terminal device is a terminal device accessed to the first access device;

the second access device receives access indication information from a control device, wherein the access indication information is used for indicating the second access device to establish communication with the first terminal device according to the link information, and the access indication information comprises an identifier of the first terminal device;

and the second access equipment establishes communication with the first terminal equipment indicated by the identification according to the link information.

24. The method of claim 23, wherein the access indication information is carried in an access indication message, the access indication message comprising an access indication message type field, a target candidate device identification field, and a first terminal device identification field, the access indication message type field being used to indicate that the access indication message carries the access indication information, the target candidate device identification field being used to indicate an identification of the second access device, and the first terminal device identification field being used to indicate an identification of the first terminal device.

25. The method according to any of claims 23-24, wherein the link information comprises at least one of the following information: a communication key between the first access device and the first terminal device, a communication capability of the first terminal device, and a message for establishing a link between the first access device and the first terminal device.

26. The method according to any of claims 23-25, wherein the second access device obtaining link information between the first access device and the first terminal device comprises:

the second access device receives the link information from the control device or the first access device.

27. The method according to any of claims 23-26, wherein before the second access device receives access indication information from a control device, the method further comprises:

and the second access device sends the identification of the terminal device accessed to the second access device and the signal intensity of other devices detected by the second access device to the control device.

28. The method according to any of claims 23-25, wherein before the second access device receives access indication information from a control device, the method further comprises:

The second access device sends at least one of the following information to the control device: the network parameters of the second access device, the load of the second access device, the channel utilization rate of the second access device, the signal strength of the interference signal detected by the second access device, and the signal strength of the terminal device accessed to the second access device detected by the second access device.

29. The method according to any of claims 23-28, wherein the access indication information is carried in a custom message, or in a payload of an ethernet message, or in a payload of an optical network unit management control interface message.

30. A communication device comprising a processor and a transceiver for communicating with other communication devices, the method of any of claims 1-14 being performed when the processor executes instructions.

31. A communication device comprising a processor and a transceiver for communicating with other communication devices, the method of any of claims 15-22 being performed when the processor executes instructions.

32. A communication device comprising a processor and a transceiver for communicating with other communication devices, the method of any of claims 23-29 being performed when the processor executes instructions.

33. A communication system comprising a communication device according to claim 30, a communication device according to claim 31 and a communication device according to claim 32.

34. A computer readable storage medium comprising instructions which, when executed on a communications device, cause the communications device to perform the method of any one of claims 1 to 14, or to perform the method of any one of claims 15 to 22, or to perform the method of any one of claims 23 to 29.