CN111885630B

CN111885630B - Data transmission method and communication device

Info

Publication number: CN111885630B
Application number: CN202010622056.6A
Authority: CN
Inventors: 赵良; 王光全; 张贺; 满祥锟; 刘欣
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2023-06-30
Anticipated expiration: 2040-07-01
Also published as: CN111885630A

Abstract

The application discloses a data transmission method and a communication device. The method comprises the following steps: the method comprises the steps that a first network device receives a first data packet from a second network device, wherein the first data packet comprises first data and a first identifier, the first identifier is used for indicating that a link connected with the second network device in the second network is broken/interrupted, the first network device is a device in the first network, the second network device is a device on a first transmission path of the first data packet, the second network device is a device in the second network, and the first network and the second network are networks using different network protocols; the first network device sends the first data to devices in a second network through a second transmission path, and the devices on the second transmission path do not include the second network device. The embodiment of the application is applied to the process of intercommunication of the PeOTN network and the IPRAN network.

Description

Data transmission method and communication device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a data transmission method and apparatus.

Background

With the development of the fifth generation (5th genertation 5G) technology, the 5G bearer starts to implement data transmission by adopting a mixed networking mode of an internet protocol radio access network (internet protocol radio access network, ip ran) network and a packet enhanced optical transport network (packet enhanced optical transport network, peOTN) network. For example, devices of the access layer can be communicated with each other through a PeOTN network; devices of the core layer can be communicated with each other through an IPRAN network. Wherein the PeOTN network and the IPRAN network may be connected through a user network interface (user network interface, UNI) to implement interworking of the PeOTN network and the IPRAN network.

The network protection is particularly important when the mixed networking of the IPRAN network and the PeOTN network fails. The normal transmission of data between the IPRAN network and the PeOTN network can be ensured through network protection. Most existing network protection methods are directed to single point failure. For protection against multiple point failures, for example, if links on both sides of the convergence layer device fail simultaneously, there is no network protection method. Therefore, when a multipoint fault occurs in the hybrid networking of the IPRAN network and the PeOTN network, how to ensure normal transmission of data becomes a problem to be solved.

Disclosure of Invention

The application provides a data transmission method and a communication device, which are used for ensuring normal transmission of data when multipoint faults occur in a hybrid networking of an IPRAN network and a PeOTN network.

In order to achieve the above purpose, the present application uses the following technical scheme:

in a first aspect, a data transmission method is provided, the method including:

a first network device in a first network receives a first data packet which comprises first data and a first identifier and is used for indicating that a link connected with the first network device in a second network fails/breaks, from a second network device connected with the first network device in a second network, wherein the second network device is a device on a first transmission path of the first data packet, and the first network and the second network are networks using different network protocols; the first network device transmits second data to devices in the second network via a second transmission path, the devices on the second transmission path not including the second network device.

Based on the method of the first aspect, when the first network device receives a first identifier of the second network device, the first identifier being used by the first network device to indicate that a link connected to the second network device in the second network is faulty/broken, the first network device may transmit the first data through the second transmission path. Since the devices on the second transmission path do not include the second network device, that is, the second transmission path can normally transmit the first data. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

In a second aspect, a communication device is provided, the communication device comprising a communication unit. A communication unit, configured to receive a first data packet from a second network device, where the first data packet includes first data and a first identifier that indicates that a link connected to the second network device in the second network fails/breaks, the first network device is a device in a first network, the second network device is a device on a first transmission path of the first data packet, the second network device is a device in the second network, and the first network and the second network are different networks; and the communication unit is further used for sending the first data to the equipment in the second network through the second transmission path, and the equipment on the second transmission path does not comprise the second network equipment.

In a third aspect, there is provided a computer readable storage medium having instructions stored therein which, when executed, implement the method of the first aspect.

In a fourth aspect, a chip is provided, the chip comprising at least one processor and a communication interface, the communication interface being coupled to the at least one processor, the at least one processor being configured to execute a computer program or instructions to implement the method of the first aspect.

In a fifth aspect, a data transmission method is provided, the method including: a second network device in the second network receives the second data from a first network device in the first network, the first network device is in communication connection with the second network device, and the first network and the second network are networks using different network protocols; if the second network device detects that the link connected with the second network device in the second network fails/breaks down, the second network device sends a first data packet including first data and a first identifier for indicating that the link connected with the second network device in the second network fails/breaks down to the first network device.

According to the method of the fifth aspect, if the second network device detects that a link connected to the second network device in the second network fails/breaks down, the second network device sends an identifier or information for indicating that the link connected to the second network device in the second network fails/breaks down to the first network device, so that when the first network device receives the identifier or information, the first network device sends first data to devices in the second network through other normal transmission paths. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

In a sixth aspect, a communication apparatus is provided, the apparatus comprising a communication unit;

a communication unit, configured to receive a second data packet including first data and first address information from a first network device in a first network, where the first network device is communicatively connected to a second network device, the first address information is address information of a device that receives the first data, and the first network and the second network are networks that use different network protocols;

and the communication unit is further used for sending a first data packet comprising first data and a first identifier for indicating that the link connected with the second network in the second network is failed/interrupted to the first network device if the second network device detects that the link connected with the second network device in the second network is failed/interrupted.

In a seventh aspect, there is provided a computer readable storage medium having instructions stored therein which, when executed, implement the method of the fifth aspect.

In an eighth aspect, there is provided a chip comprising at least one processor and a communication interface coupled to the at least one processor, the at least one processor being configured to execute a computer program or instructions to implement the method of the fifth aspect.

The apparatus, the computer readable storage medium, the computer program product, or the chip are configured to perform the corresponding method provided above, and therefore, the advantages achieved by the apparatus, the computer readable storage medium, the computer program product, or the chip are referred to as the advantages of the corresponding scheme in the corresponding method provided above, and are not described herein.

Drawings

Fig. 1 is a simplified schematic structural diagram of a communication network according to an embodiment of the present application;

fig. 2 is a simplified schematic structural diagram of another communication network according to an embodiment of the present application;

fig. 3 is a simplified schematic structural diagram of still another communication network according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 5 is a flow chart of a data transmission method according to an embodiment of the present application;

fig. 6 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device 70 according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a communication device 80 according to an embodiment of the present application;

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

Detailed Description

Before introducing embodiments of the present application, some terms involved in the embodiments of the present application are explained:

PeOTN network: it is a network that combines the conventional optical transport network (optical transport network, OTN) and packet transport network (packet transport network, PTN) technologies, and has not only packet processing capability of the PTN, but also super-large capacity bandwidth of the OTN technology and capability of long-distance data transmission. The equipment at the network side can utilize the PeOTN network to complete the task of collecting and sending the data, thereby improving the utilization rate of the network. The devices in the PeOTN network may use a multiprotocol label switching transport application (multi-protocol label switch transport profile, MPLS-TP) protocol to implement interworking.

Ip ran network: based on interconnection protocol (internet protocol, IP)/MPLS and key technology, the network is mainly oriented to mobile service bearing and provides two-three channel service bearing, and depends on the backbone layer of the next generation of Chinese telecommunication bearing network (China Net Next Carrying Network, CN 2) to form an end-to-end service bearing network. Wherein devices in the IPRAN network can use MPLS protocol to realize intercommunication.

Fig. 1 is a simplified schematic diagram of a communication network according to an embodiment of the present application. The communication network may include a service network element, a core layer, a convergence layer, and an access layer. The service network element may include a plurality of network element devices, and the core layer may include a plurality of core devices, which may also be referred to as core nodes. The aggregation layer may comprise a plurality of aggregation devices, which may also be referred to as aggregation nodes. The device type of the convergence device connected with the core device in the convergence devices is different from the device type of the convergence device connected with the access layer in the convergence devices. The access layer may include a plurality of access devices. The plurality of access devices may include a primary access point and a terminal access point. The functions, device types, levels, and infrastructure of the network element device, the core device, the aggregation device, and the access device may be as shown in table 1.

TABLE 1

It should be noted that the device functions, device types, levels, and infrastructures of the devices in table 1 are merely exemplary, and with the development of network technology, the device functions, device types, levels, and infrastructures of the devices may be configured as needed, and are not limited. Of course, other devices, such as an active antenna processing unit (active antenna unit, AAU), may also be included in fig. 1 and table 1. The AAU may refer to the prior art for its function, and will not be described in detail.

Hybrid networking of IPRAN network and PeOTN network: the hybrid networking mode of the IPRAN network and the PeOTN network is that, for example, as shown in a network architecture in FIG. 1, communication connection between access layer devices and between aggregation devices connected with the access layer devices in an aggregation layer can be realized through the PeOTN network; the core layer devices and the convergence devices connected with the core layer devices in the convergence layer can be connected through IPRAN network communication.

Fig. 2 is a simplified schematic diagram of another communication network according to an embodiment of the present application. As shown in fig. 2, the communication network may include a network device 210, an access device (e.g., access device 221, access device 222, access device 223 in fig. 2), a convergence device 230, a convergence device 240, and a bearer device 250. The bearer 250 may include a 5G bearer and an IP bearer.

Wherein the network device 210 may be connected to the access device 220 by means of an ethernet virtual private line (ethernet virtual private line, EVPL).

The access device 220 and the aggregation device 230 may be connected through a PeOTN network. Static PW and tunnel setup traffic may be used between access device 220 and convergence device 230. Such as EVPL traffic.

It should be noted that, between access device 221 and access devices 222 and 223, there are primary and backup PWs, and each PW is configured with LSP1:1.

the sink device 230 and the sink device 240 may be connected through a UNI interface. The aggregation device 240 may be connected through an IPRAN network.

The core convergence layer is configured with three layers of virtual private networks (layer virtual private network, L3 VPN) in the present application. The access layer is configured with an L2 VPN. The device of the core convergence layer can send the service from the access layer to the L3 VPN by means of L2 to L3. I.e. to achieve interworking of the PeOTN network with the IPRAN network. The manner of converting L2 to L3 may refer to the prior art, and will not be described herein.

It should be noted that in the embodiment of the present application, each service may be configured with a corresponding service virtual local area network (virtual local area network, vlan) according to a service type. When the network device sends service to the core convergence layer through the access network, the IP address of the network device corresponds to the downlink logic sub-interface of the IPRAN network in the core convergence layer one by one.

The following describes the procedure of traffic transmission between the IPRAN network and the PeOTN network:

1. when the PeOTN network sends a service to the IPRAN network, the device of the access layer may encapsulate the service from the network device into a PW according to the port (port) +vlan, and tunnel the PW to the device of the convergence layer (PeOTN network), where the device of the convergence layer forwards the service to the IPRAN network;

2. when the IPRAN network sends the service to the PeOTN network, the equipment of the convergence layer (PeOTN network) identifies the downlink logic subinterface of the IPRAN network and encapsulates the service to PW. And then, the equipment of the convergence layer sends the service to an access layer (PeOTN network) according to the downlink logic subinterface and the tunnel corresponding to the service. And the equipment of the access layer sends the port+vlan identification of the client side corresponding to the PW to the client side (or the terminal or the network equipment).

It should be noted that, the three-layer gateway between the device of the access layer and the device of the convergence layer may be as follows: 1 model configuration. I.e. one sub-interface of the N VLANs of the access layer to the IPRAN. The sub-interface may be a Dot1q VLAN sub-interface or a super (super) VLAN sub-interface, without limitation.

Network protection: network protection refers to protecting a network through various network protection modes in order to ensure normal transmission of service data when the network fails. For example, the plurality of network protection modes may include tunnel protection, traffic protection, and the like. The tunnel protection and the traffic protection are described below.

1. Tunnel protection, which may also be referred to as label forwarding path (label switching path, LSP) 1:1 protection, is a basic protection scheme for an IPRAN network. Tunnel protection refers to establishing an LSP backup tunnel while establishing an LSP main tunnel, and simultaneously issuing the LSP backup tunnel to a forwarding device. When the main tunnel fails, the service can be quickly switched to the backup tunnel bearer.

2. The service protection refers to a protection mode that equipment of an access layer adopts Pseudo Wire (PW) redundancy, and a virtual private network fast reroute (virtual private network fast reroute, VPN FRR) adopted by a convergence core layer. The PW redundancy refers to establishing a backup PW and a bypass PW (BypassPW) while establishing a primary PW. When the main PW fails, the service may be switched to a backup PW, and then sent from the BypassPW to a network device that receives the service.

Currently, when a single point failure occurs to the hybrid network of the IPRAN network and the PeOTN network, protection may be performed by multiple protection modes, for example, protection convergence IPRAN equipment failure, IPRAN and PeOTN butt-joint link failure, peOTN convergence point equipment failure, IPRAN intra-network link or node failure, peOTN intra-network link or node failure, and the like. The various protection modes can refer to the prior art and are not repeated.

For example, the core convergence layer may configure label distribution protocol (label distribution protocol, LDP) FRR/traffic engineering hot-standby (traffic engineering hot standby, TE HSB) to provide link protection and VPN FRR to provide node protection according to deployment of tunnel layer LDP/RSVP-TE protocol.

For another example, if the core convergence layer link fails, the normal transmission of the service can be ensured by switching to the backup LSP through LDP FRR/TE hotspot.

For another example, if the convergence layer fails, the next hop protection can be switched to through VPN FRR. If the core node fails, the uplink flow VPN FRR is switched to the next protection, and the downlink flow of the core network is protected through the main and standby routes.

For another example, if the access stratum interconnect link fails, the ip ran network and the PeOTN network may be protected by an address resolution protocol (address resolution protocol, ARP) bi-cast or virtual routing redundancy protocol (virtual router redundancy protocol, VRRP).

For another example, if the access layer link fails, the PeOTN network may employ PW redundancy or LSP 1:1 protection.

It should be noted that the single point fault and the single point fault protection method are only exemplary, and other single point faults and single point fault protection methods may also be included, which are not limited.

If the hybrid network of the IPRAN network and the PeOTN network has a multipoint fault, the IPRAN network and the PeOTN network use different network protocols, so that the protection of the multipoint fault is difficult.

The following describes a multipoint failure of the communication network and a protection method when the multipoint failure occurs in the communication network with reference to the communication network shown in fig. 3.

In the communication network shown in fig. 3, the communication network may include a first network 310 and a second network 320. The first network 310 may include, among other things, a first network device 311, a first network device 312, a first network device 313, a first network device 314, a first network device 315, and a first network device 316. The second network 320 may include a second network device 321, a second network device 322, a second network device 323, a second network device 324, and a second network device 325. The first network 310 may be communicatively coupled to the second network 320. For example, the first network device 314 is connected to the second network device 323, and the first network device 313 is connected to the second network device 325. Wherein the first network device 314 and the second network device 323 may be connected via a UNI1 interface, and the first network device 313 and the second network device 325 may be connected via a UNI2 interface. Of course, the first network device 314 and the second network device 323, and the first network device 313 and the second network device 325 may also be connected through other interfaces, without limitation.

The first network device 311 is connected to the first network device 316 through the link 1, and is connected to the first network device 312 through the link 6. The first network device 316 is connected to the first network device 315 via link 2. The first network device 315 is connected to the first network device 314 via link 3. The first network device 314 is connected to the first network device 313 via a link 4. The first network device 313 is connected to the first network device 312 via link 5.

The second network device 321 is connected to the second network device 322 via the link 11, and is connected to the second network device 324 via the link 12. The second network device 322 is connected to the second network device 323 via the link 10, and is connected to the second network device 324 via the link 12. The second network device 323 is connected to the second network device 325 via link 7. The second network device 325 is connected to the second network device 324 via link 8.

In this embodiment, the multipoint failure may refer to the failure/interruption of the link 3 and the link 4 connected to the first network device 314, or may refer to the failure/interruption of the link 3 and the link 4 connected to the first network device 313, or may refer to the failure/interruption of the link 7 and the link 10 connected to the second network device 323, or may refer to the failure/interruption of the link 7 and the link 8 connected to the second network device 325.

Wherein, the first network 310 may be an IPRAN network, and the second network 320 may be a PeOTN network. Alternatively, the second network 320 may be an IPRAN network, and the first network 310 may be a PeOTN network, without limitation. In the following, the first network 310 is taken as an IPRAN network, and the second network 320 is taken as a PeOTN network as an example.

In one possible implementation, the detection protocols may be mutually bound through ports between the IPRAN network and the PeOTN network or links in the network. When a link connected to a device in network 1 (e.g., an IPRAN network) fails at the same time, for example, link 7 and link 10 fail/break, network 2 (e.g., a PeOTN network) may trigger the switching off of an interconnection port laser between the two networks, or trigger a detection protocol down (down) of the link between network 1 and network 2, and send an alarm message to a device in network 1 (e.g., first network device 314) indicating a link failure between network 1 and network 2. Devices in network 1 receive the alarm information and can determine a link failure between network 1 and network 2. Thus, a device of the network 1 may change the transmission path, or a device that may be described as the network 1 may trigger protection switching to change the transmission path.

Based on the technical scheme, when the link in the network 1 fails, the protocol down of the link between the network 1 and the network 2 can be triggered, so that the device in the network 2 perceives that the link between the network 1 and the network 2 fails, that is, the device in the network 2 can determine that the original transmission path cannot transmit data. Therefore, the equipment in the network 2 can replace the transmission path, and the normal transmission of the data is ensured.

However, in the above scheme, when a plurality of links of the network 1 fail, the link failure between the network 1 and the network 2 is triggered, and the devices in the network 2 may perform protection switching. However, when troubleshooting is performed, the operator needs to check a plurality of links of the network 1 and links between the network 1 and the network 2, thereby increasing the workload of the operator.

Based on this, the embodiment of the application provides a data transmission method, which includes: a first network device in a first network receives a first data packet which comprises first data and a first identifier and is used for indicating that a link connected with the first network device in a second network fails/breaks, from a second network device connected with the first network device in a second network, wherein the second network device is a device on a first transmission path of the first data packet, and the first network and the second network are networks using different network protocols; the first network device sends a second data packet to devices in the second network via a second transmission path, the devices on the second transmission path not including the second network device.

According to the method provided by the embodiment of the application, when the first network device receives the first identifier of the second network device, which is used for indicating that the link connected with the second network device in the second network is faulty/interrupted, the first network device can transmit the first data through the second transmission path. Since the devices on the second transmission path do not include the second network device, that is, the second transmission path can normally transmit the first data. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

The method provided in the embodiments of the present application will be described below with reference to the accompanying drawings.

Furthermore, fig. 3 is only an exemplary drawing, the number of devices included in fig. 3 is not controlled, and the communication network may include other devices, such as an SDN controller, in addition to the devices shown in fig. 3. Wherein a software defined network (software defined network, SDN) controller may be used to collect topology information, link state information for the whole network. It may also be used to assign a label or identifier to each network device in the network.

Wherein the topology information may include routing information between the plurality of network devices. The link state information may include bandwidth, data transfer rate, latency, etc. of routes between the plurality of network devices.

For example, the routing information before the first network device 311 and the second network device 321 may include: first network device 311→first network device 316→first network device 315→first network device 314→second network device 323→second network device 322→second network device 321, first network device 311→first network device 312→first network device 313→second network device 325→second network device 324→second network device 321, and the like.

In addition, the names of the respective network devices in fig. 3 are not limited, and the respective network devices may be named other names than those shown in fig. 3 without limitation.

In a specific implementation, each device shown in fig. 3 may adopt the constituent structure shown in fig. 4, or include the components shown in fig. 4. Fig. 4 is a possible structural diagram of a communication device according to an embodiment of the present application. The communication device is, for example, the first network device and the second network device. The communication apparatus 400 may be a chip or a system on chip in a first network device or a second network device, as shown in fig. 4, the communication apparatus 400 comprises a processor 401, a transmitter 402, a receiver 403, and a physical interface 404. Further, the communication device 400 may also include a memory 405. The processor 401, the transmitter 402, the receiver 403, and the physical interface 404 may be connected by communication lines.

The processor 401 is a central processing unit (central processing unit, CPU), a general purpose processor network processor (network processor, NP), a digital signal processor (digital signal processing, DSP), a microprocessor, a microcontroller, a programmable logic device (programmable logic device, PLD), or any combination thereof. The processor 401 may also be other means having a processing function such as a circuit, a device or a software module without limitation.

A transmitter 402, a receiver 403 for communicating with other devices or other communication networks. The other communication network may be an ethernet, a radio access network (radio access network, RAN), a wireless local area network (wireless local area networks, WLAN), etc. The transmitter 402, the receiver 403 may be a module, a circuit, a transceiver, or any device capable of enabling communications. The transmitter 402 and the receiver 403 may be physically independent of each other or may be integrated together.

The transmitter 402 may transmit the data packet to a neighboring device through the physical interface 404. The receiver 403 may receive data packets sent by neighboring devices through the physical interface 404.

A memory 405 for storing instructions. Wherein the instructions may be computer programs.

The memory 405 may be, but not limited to, a read-only memory (ROM) or other type of static storage device capable of storing static information and/or instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device capable of storing information and/or instructions, an EEPROM, a CD-ROM (compact disc read-only memory) or other optical disk storage, an optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, etc.

It should be noted that the memory 405 may exist separately from the processor 401 or may be integrated with the processor 401. Memory 405 may be used to store routing tables, instructions or program code or some data, etc. The memory 405 may be located inside the communication device 400 or may be located outside the communication device 400, without limitation. The processor 401 is configured to execute instructions stored in the memory 405 to implement data transmission and sending provided in the embodiments described below.

In one example, processor 401 may include one or more CPUs, such as CPU0 and CPU1 in fig. 4.

As an alternative implementation, communication device 400 includes multiple processors, e.g., processor 406 may be included in addition to processor 401 in fig. 4.

It is noted that the communication apparatus 400 may be a router, a switch, an embedded device, a chip system, or a device having a similar structure as in fig. 4. Further, the constituent structure shown in fig. 4 does not constitute a limitation of the communication apparatus, and the communication apparatus may include more or less components than those shown in fig. 4, or may combine some components, or may be arranged in different components, in addition to those shown in fig. 4.

In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.

Further, actions, terms, etc. referred to between embodiments of the present application may be referred to each other without limitation. In the embodiment of the present application, the name of the message or the name of the parameter in the message, etc. interacted between the devices are only an example, and other names may also be adopted in the specific implementation, and are not limited.

The terms first, second, third and the like in the description and in the claims and in the above drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. 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.

The following describes a data transmission method provided in the embodiment of the present application, taking the communication network architecture shown in fig. 3 as an example. Each device in the following embodiments may be provided with the components shown in fig. 4, and will not be described in detail.

In which, the terms and the like related to the embodiments of the present application may refer to each other without limitation. In the embodiment of the present application, the name of the message or the name of the parameter in the message, etc. interacted between the devices are only an example, and other names may also be adopted in the specific implementation, and are not limited. The actions involved in the embodiments of the present application are just an example, and other names may be used in specific implementations, for example: the "included" in the embodiments of the present application may also be replaced by "carried on" or the like.

Fig. 5 provides a data transmission method according to an embodiment of the present application, as shown in fig. 5, where the method includes:

step 501, a first network device receives a first data packet from a second network device.

The first network device may be a network device connected to the second network 320 in fig. 3, for example, the first network device may be the first network device 314 or the first network device 313 in fig. 3.

The second network device may be a network device connected to the first network device in fig. 3, and the second network device may be a network device on the first transmission path of the first data packet. The first transmission path is used for transmitting first data. For example, when the first transmission path is the first network device 311→the first network device 316→the first network device 315→the first network device 314→the second network device 323→the second network device 322→the second network device 321, the second network device may be the second network device 323. When the first transmission path is the first network device 311→the first network device 312→the first network device 313→the second network device 325→the second network device 324→the second network device 321, the second network device may be the second network device 325.

The first data packet comprises first data and a first identifier. The first identifier is used to indicate that a link in the second network connected to the second network device is down/broken. The link in the second network to the second network device refers to a link between the second network device and an adjacent network device in the second network. That is, the second network device cannot send data to other network devices in the second network. For example, the links to the second network device 323 may include link 10 and link 7. Links connected to the second network device 325 may include link 7 and link 8. The first data includes destination address information that may also include other information, such as the first data packet. The destination address information may be, without limitation, an identification of a network device receiving the first data, an IP address, or the like. The identity of the network device and the IP address are used to uniquely identify one network device.

The first data may be data that is sent by a device in the first network to the second network when the device in the first network receives a request from the device in the second network.

For example, when the second network is a PeOTN network and the first network is an IPRAN network, the second network may be a network in an access layer and the first network may be a network in a core convergence layer. If the access layer receives a first service request from the terminal for requesting the first data, the access layer may forward the first service request to the core convergence layer. Accordingly, when the core convergence layer receives the first service request from the access layer, the core convergence layer may acquire the first data (e.g., acquire the first data from a network or a server corresponding to the first service), and send the first data to the access layer.

In an example, taking the second network device 321 as a sink network device, and taking the first network device 311 as a source network device as an example, after the first network device 311 receives the first service request, the first network device 311 may acquire first data, and send a data packet including the first data to the second network device 321 through the first transmission path.

The source network device refers to a network device for acquiring the first data, and the sink network device refers to a network device for receiving the first data. The source network device and the sink network device are devices in different networks.

If the device in the access layer detects that the multipoint fault occurs, the device in the access layer may send a first data packet to the core layer. For example, when the second network device 323 on the first transmission path receives the first data from the first network device 314, if the second network device 323 detects all the failures/interruptions of the link 7 and the link 10, the first data packet may be sent to the first network device.

Wherein the first identification may be used to indicate that a link in the second network to the second network device is down/broken.

In one example, the first identification may include a plurality of bits. Each bit of the plurality of bits corresponds to a link, and different states of a link correspond to different bit values. For example, when the bit value is 0, it indicates a link failure/interruption corresponding to the bit; when the bit value is 1, it indicates that the link corresponding to the bit is normal. For example, the bits corresponding to link 3 are 0011-X, the bits corresponding to link 4 are 0100-X, the bits corresponding to link 5 are 0101-X, the bits corresponding to link 7 are 0111-X, the bits corresponding to link 8 are 1000-X, and the bits corresponding to link 10 are 1011-X. X is used to indicate the state of the link, for example, when the value of X is 1, it indicates that the link is normal; when the value of X is 0, a link failure/disruption is identified.

For example, when link 7 and link 10 connected to the second network device 323 fail/break, the first identification may be 0111-0 to 1011-0; the first identification may be 0111-0 to 1000-0 when link 7 and link 8 connected to the second network device 325 fail/break.

In yet another example, the first identifier may be a preset symbol, for example, the first identifier may be a VLAN number, such as VLAN4000. Of course, the first identifier may be other symbols, which is not limited.

Step 502, the first network device sends first data to a device in the second network through the second transmission path.

Wherein the devices on the second transmission path do not include the second network device. For example, when the first transmission path is the first network device 311→the first network device 316→the first network device 315→the first network device 314→the second network device 323→the second network device 322→the second network device 321, and the second network device is 323, the second transmission path may be the first network device 313→the second network device 325→the second network device 324→the second network device 321. The device in the second network may be a second network device 325.

When the first network device receives the first data packet including the first identifier, the first data and the first address information may be sent to a network device connected to the second network in the first network. The first address information may be address information of a network device that receives the first data. After the network device connected with the second network in the first network receives the first data, the first data can be continuously sent to the second network until the first data is sent to the network device corresponding to the first address information, so that normal transmission of the data can be ensured.

For example, when the first network device 314 receives the first data packet from the second network device 323, the first network device 314 may send a data packet including the first data to the first network device 313. After the first network device 313 receives the data packet including the first data from the first network device 314, the data packet may be sent to the second network device 325. Since the link with the second network device 325 is normal, normal transmission of data can be ensured.

For another example, when the first network is an IPRAN network and the second network is a PeOTN network, the first network device may forward the first data to a network device connected to the second network in the first network by using a PW forwarding manner when the first network device receives the first data packet. The PW forwarding manner may refer to the prior art, and will not be described herein.

Based on the method of fig. 5, when the first network device receives a first identification of the second network device indicating that a link connected to the second network device in the second network is failed/broken, the first network device may transmit the first data through the second transmission path. Since the devices on the second transmission path do not include the second network device, that is, the second transmission path can normally transmit the first data. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

In a possible implementation manner of the method shown in fig. 5, the data transmission method provided in the implementation of the present application may further include:

the first network device may also send first indication information to the source network device if the first network device receives a first data packet from the second network device.

The source network device refers to a network device that obtains the first data, for example, the source network device may be any one of the network devices in fig. 3, for example, may be the first network device 311.

The first indication information may be used to indicate a second transmission path, where the second transmission path is used to transmit data. Alternatively, the first indication information may be used to indicate updating the transmission path. Wherein the network devices on the second transmission path and the updated transmission path do not include the second network device having the link failure.

For example, when the first indication information is used to indicate the second transmission path, the first indication information may include identification information of a plurality of network devices, which are network devices of the second transmission path. When the first indication information is used to indicate updating the transmission path, the first indication information may include one or more flag bits, and when the one or more flag bits are a first value, the transmission path for transmitting the first data is updated. For example, the first value may be T1, indicating an updated transmission path.

Based on the possible implementation manner, when the source network device receives the first indication information, the source network device can update the current transmission path when sending data to the device in the second network subsequently, so as to ensure the normal transmission of the subsequent data.

In another possible implementation manner of the method shown in fig. 3, if the second network device detects that the link connected to the second network device in the second network is restored to be normal, the second network device sends the second indication information to the first network device. The first network device may send the third indication information to the source network device when the first network device receives the second indication information from the second network device.

Wherein, the second indication information and the second indication information can be used for indicating that the link connected with the second network device in the second network is recovered to be normal. For example, the second indication information may include a second identification. The description of the second identifier may refer to the first identifier, and will not be described in detail.

After receiving the third indication information, the source network device may send data according to the current transmission path, or may update the current transmission path to the first transmission path, without limitation.

Based on the possible implementation manner, when the source network device receives that the link in the second network is recovered to be normal, the source network device increases the selectivity of the transmission path when sending data to the second network.

The method shown in fig. 5 is described in detail below in connection with the communication network of fig. 3.

As shown in fig. 6, a further data transmission method according to an embodiment of the present application includes:

step 601, the first network device sends a second data packet to the second network device. Accordingly, the second network device receives the second data packet from the first network device.

Wherein the second data packet includes the first data. Of course, the second data packet may include other information, for example, the first address information. The first address information may be a network device in the second network that receives the first data. For example, the first address information may be address information of the second network device 321. For example, the first address information may be an IP address, or may be an identifier of the second network device, which is not limited.

Step 602, the second network device detects whether a link connected to the second network device in the second network is failed/broken.

In one possible implementation, the second network device may actively send a request over a link connected to the second network device, where the request is used to detect whether the link connected to the second network device in the second network is normal. For example, the second network device may periodically send a request through all links connected to the second network device in the second network, or the second network device may send a data packet according to a transmission path if the data packet includes the transmission path after receiving the data packet sent by the first network device; if the second network device does not receive a response from the neighboring network device to the received data packet, the second network device may determine that the link with the neighboring network device is down/broken.

In yet another possible implementation, the network device connected to the second network device may periodically send heartbeat information to the second network device via the corresponding link. If the second network device does not receive the heartbeat information of the network devices corresponding to all the links within the preset time, the second network device may determine that the link connected to the second network device fails, or that the network device corresponding to the link connected to the second network device fails. That is, the second network device cannot continue forwarding the first data.

The second network device may generate the first identity in case the second network device detects that a link in the second network connected to the second network device is down/broken. To prevent the first data from being lost, the second network device may encapsulate the first identification and the first data into a first data packet.

If the second network device detects that the link in the second network connected to the second network device is failed/broken, step 603 is performed.

Step 603, the second network device sends a first data packet to the first network device. Accordingly, the first network device receives the first data packet from the second network device.

Step 604, the first network device sends the first data to a device in the second network via the second transmission path. Accordingly, a device in the second network receives the first data.

Step 603 and step 604 may refer to step 501 and step 502 in fig. 3, and are not described herein.

Step 605, the first network device sends first indication information to the source network device. Accordingly, the source network device receives first indication information from the first network device.

Step 606, the source network device updates the transmission path.

Wherein the updated transmission path does not include the second network device.

The descriptions of step 605 and step 606 may refer to the first possible implementation manner shown in fig. 3, which is not described herein.

Step 607 (optional), the second network device detects whether a link in the second network connected to the second network device is restored to normal.

If the second network device returns to normal, the second network device performs step 608 and step 609.

Step 608 (optional), the second network device sends second indication information to the first network device. Accordingly, the first network device receives second indication information from the second network device.

Step 609 (optional), the first network device sends third indication information to the source network device. Accordingly, the source network device receives third indication information from the first network device.

The descriptions of step 607, step 608 and step 609 may refer to the second possible implementation manner shown in fig. 3, which is not described in detail.

In the embodiment of the present application, the case where the second network has a multipoint fault and the device in the first network sends data to the second network is taken as an example for explanation, and when the second network has a multipoint fault and the device in the second network sends data to the first network, each device in the second network may actively change the transmission path when detecting that the second network has a multipoint fault due to a communication relationship between the devices in the second network. Alternatively, the device in the second network may change the transmission path or change the next hop device after receiving the instruction of the other device. Thereby ensuring the normal transmission of data.

When the first network sends the multipoint fault, the device in the second network may refer to the method shown in the foregoing embodiment and will not be described herein.

Based on the method of fig. 6, when the first network device receives a first identification of the second network device indicating that a link adjacent to the second network device in the second network is failed/broken, the first network device may transmit the first data through the second transmission path. Since the devices on the second transmission path do not include the second network device, that is, the second transmission path can normally transmit the first data. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

The various schemes in the embodiments of the present application may be combined on the premise of no contradiction.

The embodiment of the present application may divide the functional modules or functional units of the communication device according to the above method example, for example, each functional module or functional unit 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 or functional units. The division of the modules or units in the embodiments of the present application is merely a logic function division, and other division manners may be implemented in practice.

In the case of dividing the respective functional modules by the respective functions, fig. 7 shows a schematic configuration of a communication apparatus 70, and the communication apparatus 70 may be a first network device or a chip applied to the first network device, and the communication apparatus 70 may be used to perform the functions of the communication apparatus according to the above-described embodiments. The communication device 70 shown in fig. 7 may include: the communication unit 702 and the processing unit 701 may further include a storage unit 703. The schematic structural diagram shown in fig. 7 may be used to illustrate the structure of the first network device involved in the above-described embodiment.

When the schematic structural diagram shown in fig. 7 is used to illustrate the structure of the first network device according to the foregoing embodiment, the processing unit 701 is configured to control and manage the actions of the first network device, for example, the communication unit 702 is configured to receive, from the second network device, a first data packet including first data and a first identifier for indicating that a link connected to the second network device in the second network is failed/broken, where the first network device is a device in the first network, the second network device is a device on a first transmission path of the first data packet, and the second network device is a device in the second network, where the first network and the second network are different networks.

The communication unit 702 is further configured to send the first data to a device in the second network via the second transmission path, where the device on the second transmission path does not include the second network device.

In a possible design, the communication unit 702 is further configured to send first indication information to a source network device corresponding to the first data packet, where the first indication information is used to indicate that a transmission path of the first data is updated, or the first indication information is used to indicate that a link connected to the second network device in the second network is faulty/broken.

In a possible design, the communication unit 702 is further configured to send a second data packet to the second network device, where the second data packet includes first data and first address information, and the first address information is address information of a device that receives the first data.

The specific implementation of the communication apparatus 70 may refer to the behavioral function of the first network device in the data transmission method shown in fig. 5 or fig. 6.

As yet another implementation, the processing unit 701 in fig. 7 may be replaced by a processor, which may integrate the functions of the processing unit 701. The communication unit 702 in fig. 7 may be replaced by a transceiver or a transceiving unit, which may integrate the functions of the communication unit 702.

Further, when the processing unit 701 is replaced by a processor and the communication unit 702 is replaced by a transceiver or a transceiver unit, the communication device 70 according to the embodiment of the present application may be the communication device shown in fig. 4.

In the case of dividing the respective functional modules by the respective functions, fig. 8 shows a schematic structural diagram of a communication apparatus 80, and the communication apparatus 80 may be a second network device or a chip applied to the second network device, and the communication apparatus 80 may be used to perform the functions related to the above embodiment through the second network device. The communication device 80 shown in fig. 8 may include: communication unit 802 and processing unit 801 may also include a storage unit 803. The schematic diagram shown in fig. 7 may be used to illustrate the structure of the second network device involved in the above embodiment.

When the schematic structural diagram shown in fig. 8 is used to illustrate the structure of the first network device according to the above embodiment, the processing unit 801 is configured to control and manage the actions of the second network device, for example, the communication unit 802 is configured to receive a second data packet including first data and first address information from the first network device in the first network, where the first network device is communicatively connected to the second network device, the first address information is address information of a device that receives the first data, and the first network and the second network are networks using different network protocols.

The communication unit 802 is further configured to send, to the first network device, a first data packet including first data and a first identifier for indicating that the link in the second network connected to the second network is faulty/broken, if the second network device detects that the link in the second network connected to the second network device is faulty/broken.

The specific implementation of the communication apparatus 80 may refer to the behavioral function of the second network device in the data transmission method shown in fig. 6.

As yet another implementation, processing unit 801 in fig. 8 may be replaced by a processor, which may integrate the functionality of processing unit 801. The communication unit 802 in fig. 8 may be replaced by a transceiver or a transceiving unit, which may integrate the functions of the communication unit 802.

Further, when the processing unit 801 is replaced by a processor and the communication unit 802 is replaced by a transceiver or a transceiver unit, the communication device 80 according to the embodiment of the present application may be a communication device shown in fig. 4.

Fig. 9 is a block diagram of a communication system according to an embodiment of the present application, and as shown in fig. 9, the system may include: a first network device 901, a second network device 902, etc.

Wherein the first network device 901 may be used to perform the steps of the first network device in fig. 5 and 6. The second network device 902 may perform the steps of the second network device of fig. 6. The first network device 901 has the functions of the first network device shown in fig. 5 and 6. The second network device 902 has the functionality of the second network device shown in fig. 6.

In particular, in this possible design, the implementation procedure of the first network device 901 may refer to the implementation procedure of the first network device related to the method embodiment shown in fig. 5 and fig. 6, and the implementation procedure of the second network device 902 may refer to the implementation procedure of the second network device related to the method embodiment shown in fig. 6.

Based on the system shown in fig. 9, when the first network device receives the first identification of the second network device for indicating that the link connected to the second network device in the second network is failed/broken, the first network device may transmit the first data through the second transmission path. Since the devices on the second transmission path do not include the second network device, that is, the second transmission path can normally transmit the first data. Therefore, when the second network has multipoint faults, the first network device can normally send the data required by the second network device to the device in the second network, and normal transmission of the data between the first network and the second network is ensured.

Embodiments of the present application also provide a computer-readable storage medium. All or part of the flow in the above method embodiments may be implemented by a computer program to instruct related hardware, where the program may be stored in the above computer readable storage medium, and when the program is executed, the program may include the flow in the above method embodiments. The computer readable storage medium may be an internal storage unit of the first network device or the second network device (including the data transmitting end and/or the data receiving end) of any of the foregoing embodiments, for example, a hard disk or a memory of the first network device or the second network device. The computer readable storage medium may be an external storage device of the first network device or the second network device, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (flash card) or the like provided in the first network device or the second network device. Further, the computer readable storage medium may further include both an internal storage unit and an external storage device of the first network device or the second network device. The computer-readable storage medium is used to store the computer program and other programs and data required by the first network device or the second network device. The above-described computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.

It should be noted that the terms "first" and "second" and the like in the description, claims and drawings of the present application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

It should be understood that, in the present application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two or three and three or more, "and/or" for describing an association relationship of an association object, three kinds of relationships may exist, for example, "a and/or B" may mean: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the apparatus is divided into different functional modules to implement all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another apparatus, 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 an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and the parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a device (may be a single-chip microcomputer, a chip or the like) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection 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 data transmission method, comprising:

a first network device receives a first data packet from a second network device, wherein the first data packet comprises first data and a first identifier, the first identifier is used for indicating that a plurality of links connected with the second network device in a second network are failed/interrupted, the first network device is a device in the first network, the second network device is a device in the second network, the first network and the second network are networks using different network protocols, and the second network device is a device on a first transmission path of the first data packet; the first network is an internet protocol radio access network IPRAN network, the second network is a packet enhanced optical transport network PeOTN network, and the first network equipment and the second network equipment are connected through a UNI interface;

The first network device acquires the first data from the first data packet, and forwards the first data to the network device connected with the second network in the first network through a PW forwarding mode, so that the network device sends the first data to the device in the second network through a second transmission path, and the device on the second transmission path does not include the second network device.

2. The data transmission method according to claim 1, characterized in that the method further comprises:

the first network device sends first indication information to the source network device corresponding to the first data packet, where the first indication information is used to indicate updating of a transmission path of the first data.

3. The data transmission method according to claim 1 or 2, characterized in that the method further comprises:

the first network device sends a second data packet to the second network device, wherein the second data packet comprises the first data and first address information, and the first address information is address information of a device receiving the first data.

4. The data transmission method according to claim 1 or 2, wherein the first network is a PeOTN network and the second network is an IPRAN network.

5. A method of data transmission, the method comprising:

the method comprises the steps that second network equipment receives a second data packet from first network equipment, wherein the second data packet comprises first data, the first network equipment is equipment in a first network, the second network equipment is equipment in a second network, the first network equipment is in communication connection with the second network equipment, and the first network and the second network are networks using different network protocols; the first network is an internet protocol radio access network IPRAN network, the second network is a packet enhanced optical transport network PeOTN network, and the first network equipment and the second network equipment are connected through a UNI interface;

if the second network device detects that a plurality of links connected with the second network device in the second network fail/break, the second network device sends a first data packet to the first network device, where the first data packet includes the first data and a first identifier, the first identifier is used to indicate that a plurality of links connected with the second network device in the second network fail/break, and the first network device is used to obtain the first data from the first data packet, and forward the first data to a network device connected with the second network in the first network by using a PW forwarding manner, so that the network device sends the first data to a device in the second network through a second transmission path, and a device on the second transmission path does not include the second network device.

6. The data transmission method according to claim 5, wherein the first network is a packet-enhanced optical transport network PeOTN network and the second network is an internet protocol radio access network IPRAN network.

7. A communication apparatus, characterized in that it is applied to a first network device, includes a communication unit,

the communication unit is configured to receive a first data packet from a second network device, where the first data packet includes first data and a first identifier, where the first identifier is used to indicate that multiple links connected to the second network device in a second network fail/break, the first network device is a device in the first network, the second network device is a device in the second network, and the first network and the second network are networks using different network protocols, and the second network device is a device on a first transmission path of the first data packet; the first network is an internet protocol radio access network IPRAN network, the second network is a packet enhanced optical transport network PeOTN network, and the first network equipment and the second network equipment are connected through a UNI interface;

The communication unit is further configured to obtain the first data from the first data packet, and forward the first network to a network device connected to the second network in the first network by using a PW forwarding manner, so that the network device sends the first data to a device in the second network through a second transmission path, where the device on the second transmission path does not include the second network device.

8. The communication device of claim 7, wherein the communication device is configured to,

the communication unit is further configured to send first indication information to a source network device corresponding to the first data packet, where the first indication information is used to indicate updating a transmission path of the first data.

9. The communication apparatus according to claim 7 or 8, wherein the communication unit is further configured to send a second data packet to the second network device, the second data packet including the first data and first address information, the first address information being address information of a device that receives the first data.

10. The communication apparatus according to claim 7 or 8, wherein the first network is a packet-enhanced optical transport network, peOTN, network and the second network is an internet protocol radio access network, IPRAN, network.

11. A communication apparatus, for use with a second network device, the communication apparatus comprising: a communication unit;

the communication unit is configured to receive a second data packet from a first network device, where the second data packet includes first data, the first network device is a device in a first network, the second network device is a device in a second network, the first network device is communicatively connected to the second network device, and the first network and the second network are networks that use different network protocols; the first network is an internet protocol radio access network IPRAN network, the second network is a packet enhanced optical transport network PeOTN network, and the first network equipment and the second network equipment are connected through a UNI interface;

the communication unit is configured to send a first data packet to the first network device if a failure/interruption of multiple links connected to the second network device in the second network is detected, where the first data packet includes the first data and a first identifier, the first identifier is used to indicate that a failure/interruption of multiple links connected to the second network device in the second network occurs, and the first network device is configured to obtain the first data from the first data packet and forward the first data to a network device connected to the second network in the first network by using a PW forwarding manner, so that the network device sends the first data to a device in the second network through a second transmission path, and a device on the second transmission path does not include the second network device.

12. The communication apparatus of claim 11, wherein the first network is a packet-enhanced optical transport network, peOTN, network and the second network is an internet protocol radio access network, IPRAN, network.

13. A computer readable storage medium having instructions stored therein which, when executed, implement the method of any one of claims 1 to 4, or claim 5 or 6.

14. A chip comprising at least one processor and a communication interface coupled to the at least one processor, the at least one processor for running a computer program or instructions to implement the method of any one of claims 1 to 4 or claim 5 or claim 6.