CN113766433B

CN113766433B - Topology service sensing method of wireless channel equipment

Info

Publication number: CN113766433B
Application number: CN202111056095.5A
Authority: CN
Inventors: 程明; 何硙卓; 卢建福
Original assignee: CETC 34 Research Institute
Current assignee: CETC 34 Research Institute
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2022-10-14
Anticipated expiration: 2041-09-09
Also published as: CN113766433A

Abstract

The invention discloses a topology service perception method of wireless channel equipment, which is based on the management information interaction between any service port of packet transmission equipment and the wireless channel equipment, realizes the automatic discovery of the topology information of the wireless channel equipment under the wired and wireless mixed networking environment, intelligently perceives the topology information and the topology change of the wireless channel equipment by the packet transmission equipment, and realizes the adjustment of service parameters of planning services and the intelligent scheduling of service quality after reporting the changed topology information to a packet transmission equipment controller based on a service perception model; and mapping different service flows into different logic management channels to realize priority guarantee sending of high-priority services.

Description

Topology service sensing method of wireless channel equipment

Technical Field

The invention relates to the technical field of service perception, in particular to a topology service perception method of wireless channel equipment.

Background

In a new generation of packet transport network with software control capability, the devices that make up the packet transport network are called packet transport devices, which provide various applications and services in the access network, metropolitan area and backbone transport networks for integrated services such as mobile backhaul, private lines for government and enterprise, etc.

In a packet transport network, a service awareness technology is one of basic conditions for providing differentiated services by a network, an access network is a primary link for transmitting user information, and in a high-reliability network environment, a wireless communication channel can effectively supplement the multi-channel characteristics of a link under a severe environment or an environment intentionally damaged by people, so that the reachability of service forwarding is improved to the maximum extent, a more stable and reliable physical transmission channel is provided for upper-layer application, and a good basis is provided for providing end-to-end quality of service (Qos).

The wireless channel service perception technology is a technology for automatically identifying and distinguishing different devices in a network, and the dynamic perception of the service is a basis for realizing a difference quality service strategy and a safety public strategy. The business perception contains three different objects, namely: perception object, perception mode and perception result. The perception object can be a wired device type or a wireless device type; the sensing mode can be message analysis of a communication protocol, can be extraction of a characteristic value of specific flow, or a combination of the two; the sensing result is the result of service sensing, and is generally processed to meet the classification requirement of the transmission network on the high-priority object of Qos service.

The wireless device service perception technology comprises classification and identification of different wireless devices, extraction of wireless service characteristic values and application of specific means corresponding to confirmation and perception of a service perception technology body respectively. The basic process of wireless device traffic awareness is as follows: adopting packet transmission equipment to discover prospective interconnected wireless neighbor equipment, and distinguishing wireless channels according to different types of discovery equipment; different wireless channel types (such as microwave, ultrashort wave, satellite and the like) are adopted to evaluate the channel bandwidth and predict the dynamic parameters of the channel; the feature extraction of the service flow of the network service node is adopted, the characteristics of the service flow are marked, the service flow which accords with the corresponding communication channel is distributed to different wireless nodes, and the wireless channel information is utilized intelligently to the maximum extent. The classification of the wireless device types by adopting the grouping transmission device node can realize the selection of the service channel by manual intervention, and also can realize the automatic selection of the service channel according to the automatic classification result, thereby providing a safer and more reliable strategy for the whole deployment.

The existing Service awareness technology mainly performs Service awareness in a single manner, and generally analyzes a Type of Service (ToS) field of a TCP/IP packet to determine a priority of a Service Type carried by the IP packet, or distinguishes the Service types through a specific port number in a TCP/IP protocol.

Disclosure of Invention

The present invention is directed to provide a topology service awareness method for a wireless channel device. The method can realize the automatic perception of the packet transmission equipment to the wireless channel, can utilize the limited bandwidth resource to the maximum extent, realize the automatic selection of the service channel of different services according to the flow size required, and realize the pipelining bearing of the services and different data in the services.

The technical scheme for realizing the purpose of the invention is as follows:

a topology service perception method of wireless channel equipment comprises the following steps:

1) The packet transmission equipment completes discovery of the wireless channel equipment by adopting a two-layer multicast message, establishes a neighbor relation between the packet transmission equipment and the wireless channel equipment, and cannot know MAC information of expected interconnected wireless channel equipment when the packet transmission equipment starts to work, so that data interaction is carried out by adopting a two-layer multicast MAC mode, and wireless channel information interaction is carried out by two-layer multicast agreed by a channel sensing protocol;

2) The packet transmission equipment adopts a wireless channel sensing protocol to send wireless channel equipment information, wireless topology information and a wireless link information request to the wireless channel equipment, waits for information reply of the wireless channel equipment, summarizes the wireless information equipment information after receiving a reply data frame of the wireless channel equipment, generates corresponding wireless topology information and reports the wireless topology information to a packet transmission equipment controller, and the controller performs channel service sensing and processing according to the reported wireless channel information, and finally completes service channel requirement calculation and parameter adjustment of the packet transmission equipment, wherein the packet transmission equipment comprises:

2-1) the packet transmission equipment senses the existence of the wireless channel equipment by sending a two-layer multicast message, and after neighbor information of an Up state is established between the packet transmission equipment and the wireless channel equipment, the packet transmission equipment and the wireless channel equipment directly switch to use an equipment MAC address to carry out unicast data interaction;

2-2) the wireless channel equipment responds to the wireless neighbor discovery message of the packet transmission equipment, informs the packet transmission equipment of the existence of the wireless channel equipment, extracts the MAC address of the wireless channel equipment from a port neighbor database of the packet transmission equipment, and requests the equipment information, the wireless link information and the wireless topology information of the current wireless channel equipment from the wireless channel equipment information in a unicast request mode; the packet transmission equipment records the wireless equipment information, the wireless link information and the wireless topology information returned by the wireless information equipment, and summarizes and stores the information into a wireless information database; when the extracted information meets the requirement of the grouping transmission equipment controller, the information is summarized and packaged and is sent to a grouping transmission equipment controller module; meanwhile, the packet transmission equipment periodically maintains information interaction with the wireless channel equipment, and when the information of the wireless channel equipment is changed, the packet transmission equipment refreshes a local wireless information database in time and summarizes the latest wireless information and sends the latest wireless information to the packet transmission equipment controller equipment; the packet transmission equipment completes the establishment of the service and the issuing control of the service priority according to the transmitted wireless channel information;

2-3) after the grouping transmission equipment senses the wireless channel equipment with the Up state, the grouping transmission equipment sequentially sends a wireless equipment information request message, a wireless link information request message and a wireless topology information request message; the wireless channel equipment passively receives the request message of the packet transmission equipment, and replies wireless channel equipment information, wireless link information and wireless topology information after receiving the corresponding request message; after receiving a response message returned by the wireless channel equipment, the packet transmission equipment builds a wired and wireless mixed network topological graph by extracting the wireless equipment information and the wireless topological information, reports the topological information to a packet transmission equipment controller module, and builds the service of the packet transmission equipment according to the current wired and wireless mixed topological graph by the packet transmission equipment controller module;

3) The method comprises the steps that an upper layer master control network manager or a packet transmission device controller considers that a service bearing path between packet transmission devices is planned, in a wired and wireless mixed networking, user business requirements are converted into access control rules and service quality grades corresponding to the packet transmission devices, corresponding services are downloaded into the packet transmission devices in the network through a packet transmission device controller, in a receiving packet transmission device, service transmission on a wired port and a wireless port is achieved according to a service path model issued by the packet transmission device controller, the upper layer network manager or the controller artificially plans the service bearing path between two terminal nodes of the network, the user business requirements are interpreted into the access control rules and Qos differential service rules corresponding to the packet transmission devices, a series of rules are issued into all levels of packet transmission devices of the whole network, the service access control rules and the Qos differential service rules issued by all levels of the packet transmission device controller carry out differentiated processing on business messages, and a corresponding service bearing channel path is established, so that end-to-end service transmission between the two terminal devices is achieved.

In the step 2-2), in the process of the wireless channel sensing protocol frame interaction between the packet transmission equipment and the wireless channel equipment, the service sensing protocol contains different TLV information according to different requests, and the packet transmission equipment collects and reports the link state information of the equipment and the neighbor equipment of the equipment to the controller after receiving the different TLV information of the wireless channel equipment.

In step 3), in a network environment of wired and wireless hybrid networking, a service system is configured statically to designate a service flow label, a priority of a service flow and a corresponding service flow bandwidth, an upper layer network pipe or a controller creates a plurality of end-to-end pipelines according to the service priority, and places service information into different pipelines to realize an end-to-end pipeline scheduling mechanism and a pipeline protection mechanism, when an unconfigured pipeline is used as a reserved configuration pipeline, a service switching bearing function of a backup pipeline is provided when a working pipeline is damaged, wireless channel information sent by a packet transmission device enables a packet transmission device controller not to support corresponding wireless link service channel calculation, a service flow identifier, a guarantee level and corresponding bandwidth guarantee parameters are designated by the static configuration service system, an end-to-end pipeline channel is created by the upper layer network manager or the controller according to a Qos requirement of the service, and the service flow is mapped into the corresponding pipeline channel to realize end-to-end pipeline scheduler bandwidth guarantee processing, the unconfigured service information flow is designated by the device with a default priority and does not perform flow supervision.

In step 3), the dynamic bandwidth information between the packet transfer device and the wireless channel device is obtained, and a backup path of service bearing between the packet transfer devices is selected and a protection path is dynamically adjusted and calculated, and a packet transfer device controller can sense device information according to a wireless channel between different packet transfer devices and establishes a working path and a protection path under a wired environment in a wired mode; when the resources of the wireless environment are insufficient or the resources are lower than a threshold value specified by a user, starting to establish a working path and a protection path of a wireless channel; finally, the smooth service of the network user is ensured to the maximum extent.

Compared with the prior art, the technical scheme has the following characteristics:

1. the technical scheme realizes the automatic perception of the packet transmission equipment to the wireless channel based on the wireless channel interaction between any service port of the packet transmission equipment and a management port of the wireless channel equipment;

2. the packet transmission equipment intelligently senses wireless channel information, summarizes a wireless information sensing result, automatically plans a service priority and sets a service forwarding level; the service flows with different channel capacities are mapped into different logic pipelines according to the wireless channel bandwidth, so that the service flow is forwarded as required, and limited bandwidth resources are utilized to the maximum extent; according to the state of the whole network communication link, realizing the pipeline monitoring of the service, completing the calculation of a working path and a protection path, and realizing the service switching of the protection path when the working path is realized;

3. based on the pipelined bearing requirements of services with different flows, the technical scheme realizes automatic flow control of a forwarding plane and port flow speed limitation, customizes and realizes the mapping relation between service flow and a pipeline and the mapping of message types in the services according to the requirements of users, realizes the automatic selection of service channels of different services according to the flow size required, and realizes the pipelined bearing of the services and different data in the services.

The method can realize the automatic perception of the grouping transmission equipment to the wireless channel, can utilize the limited bandwidth resource to the maximum extent, realize the automatic selection of the service channel of different services according to the flow size required, and realize the pipelining bearing of the services and different data in the services.

Drawings

Fig. 1 is a schematic diagram of an embodiment in which a packet transfer device automatically discovers wireless channel devices;

FIG. 2 is a schematic diagram illustrating the information interaction sensing of a wireless channel in an embodiment;

FIG. 3 is a more schematic diagram of the wireless channel information in an embodiment;

fig. 4 is a schematic diagram illustrating adjustment of priority of channel traffic in an embodiment.

Detailed Description

The invention will be further described, but not limited, by the following examples and figures:

example (b):

the embodiment realizes the automatic perception of the packet transmission equipment to the wireless channel based on the wireless channel information interaction between any service port of the packet transmission equipment and the wireless channel equipment management interface. The packet transmission equipment collects the sensing result of the wireless information, automatically plans the service priority of the service and sets the forwarding level of the service by intelligently sensing the information of the wireless channel; the service flows with different channel capacities are mapped into different logic pipelines according to the wireless channel bandwidth, so that the service flow is forwarded as required, and limited bandwidth resources are utilized to the maximum extent; according to the state of the whole network communication link, the pipeline monitoring of the service is realized, the calculation of the working path and the protection path is completed, and the service switching of the protection path is realized when the working path is realized.

The whole wireless channel information perception realization process comprises the following steps:

1. a service port of a packet transport device sends a two-layer multicast data message by starting a wireless channel sensing protocol function, performs an enumeration discovery process of wireless channel devices, and establishes a neighbor relation with the wireless channel devices when the wireless channel devices exist, as shown in fig. 1;

2. the packet transfer device finds the radio channel device in the state Up from its internal neighbor database, extracts its device MAC information to perform data interaction of the unicast radio channel information interaction protocol, as shown in fig. 2. After the packet transmission device aggregates the wireless information acquired from the wireless channel device, it constructs wireless link information and sends it to the packet transmission device controller, which establishes a corresponding service working path and service protection path for the obtained network topology connection relationship and service requirement, as shown in fig. 3; finally, the packet transfer device controller issues configuration to the relevant packet transfer device in the network according to the upper layer logic and the relevant service priority policy and rule, and the packet transfer device acquires the configuration information from the packet transfer device controller, thereby implementing the construction of the specific working path and protection path, and dynamically adjusting the priority of the message channel in the path, as shown in fig. 4.

Specifically, the method comprises the following steps:

the wireless channel information interaction between any service port of the packet transmission equipment and the wireless channel equipment management interface realizes the automatic perception of the packet transmission equipment to the wireless channel, and comprises the following steps:

1) The packet transmitting device actively searches for a discovery wireless channel device:

the method comprises the steps that a service port of a packet transmission device is configured to start a wireless channel device sensing protocol function, after a port Up of the packet transmission device is configured, the packet transmission device immediately sends a two-layer multicast message to try to perform data interaction with a direct connection device, meanwhile, a timer is started by the current packet transmission device to periodically (default for 10 seconds) send the two-layer multicast message to the direct connection device, once an opposite end device of the packet transmission device is a wireless channel device, the packet transmission device establishes a neighbor relation with the wireless channel device, and after the neighbor relation is successfully established, the two-layer multicast is used as a keepalive keep-alive function.

Referring to fig. 1, in this example, taking a packet forwarding device and a neighbor relationship established on a link of 1 wireless device as an example, a specific process for establishing a communication relationship is as follows:

1-1) the packet transmission equipment sends a two-layer multicast message, and the message has no neighbor identification;

1-2) after receiving the message, the wireless channel equipment marks the neighbor states of the wireless channel equipment and the grouping transmission equipment as an initialization (Init) state, then the wireless channel equipment replies to the grouping transmission equipment by using a multicast message, wherein the message marks the MAC address of the wireless channel equipment and the MAC address of the grouping transmission equipment, the neighbor information of the wireless channel equipment is the grouping transmission equipment, and the states of the grouping transmission equipment and the wireless channel equipment are the initialization state Init;

1-3) after receiving the message of the wireless channel equipment, the packet transmission equipment analyzes the content of the message, if the message is found to have the MAC address of the packet transmission equipment and the neighbor of the wireless channel equipment is identified as the state of Up, the packet transmission equipment identifies the neighbor state of the packet transmission equipment and the wireless channel equipment as the state of Up, and then sends a two-layer multicast message to the wireless information equipment in multicast, wherein the message identifies the MAC address of the wireless channel equipment and the MAC address of the packet transmission equipment, and the neighbor information of the packet transmission equipment is the state of Up of the wireless channel equipment, the packet transmission equipment and the wireless channel equipment;

1-4) after receiving the message of the packet transmission equipment, the wireless channel equipment analyzes the message content, and if the MAC address of the wireless channel equipment exists in the message and the neighbor of the packet transmission equipment is identified as the wireless channel equipment, the neighbor states of the wireless channel equipment and the packet transmission equipment are identified as an Up state; then replying a two-layer multicast message in an Up state to the packet transmission equipment, and identifying the neighbor information of the Up state also established by the wireless channel equipment;

thus, the packet transfer device and the wireless channel device successfully establish a neighbor relationship with each other;

here, format definitions of the radio channel sensing protocol messages are listed, and the frame format of the radio channel protocol is as follows in table 1:

TABLE 1

The meaning of each part in the data frame is as follows:

DMAC (6 bytes): here, the two-layer multicast MAC address of the wireless channel sensing protocol has the value of 01-80-C2-00-00-4D;

SMAC (6 bytes): the MAC address of the sending equipment is pointed;

type: the type is a self-defined wireless channel equipment sensing protocol type 0x8673;

PDU: the specific data segment contents of the wireless channel sensing protocol, the definition of the data field thereof is shown in the following table 2:

table 2:

LocalMAC: the device MAC address of the sender, 6 bytes long;

LocalPort: the port number of a sender, 2 bytes, a packet transfer device filling port number, and a wireless device default filling 0;

NeighborMAC: MAC address of neighbor device, 6 byte length;

NeighborPort: port number of the neighbor device, 2 bytes length;

status: the state of the neighbor; the state consists of a Down state, an Init state and an Up state;

holdtime: keeping time, informing the keeping time of the opposite terminal, and when the devices exceed the keeping time and do not receive the message of the opposite terminal, considering that the opposite terminal is disconnected, and aging the neighbor information by the device;

2) Wireless channel traffic awareness:

after the packet transmission device goes through step 1), the information of the wireless channel device is stored in the packet transmission device according to the port number in the neighbor database, after the packet transmission device starts the wireless channel service awareness protocol, the packet transmission device extracts the MAC information of the wireless channel device from the neighbor database in the packet transmission device, and sends the request of the wireless device information, the wireless link information and the wireless topology information to the wireless channel device in a unicast manner, wherein the format definition of the wireless channel information protocol message is listed, and the frame format of the wireless channel information protocol is as the following table 3:

table 3:

the wireless channel information adopts TLV structure to complete information interaction, and the meaning of each field is as follows:

type: type, 2 bytes, 0: indicating a wireless channel device type; 1: representing radio link information; 2: representing wireless topology information;

length: length, 2 bytes, length field contains the Length of the entire TLV, with Type and Length fixed Length values of 2. The Length Value N of the Value field is the Length Value minus 4;

value: the Value, N bytes, the Length of N can be calculated by subtracting 4 from the Value of the Length field, and the actual content of Value is determined by different Type;

the radio channel device type values are shown in table 4 below:

table 4:

in the TLV of the wireless channel information, the length value of the data packet is fixed and cannot be changed along with the change of the wireless node in the wireless ad hoc network;

the radio link information values are shown in table 5 below:

table 5:

in the TLV, the length of the packet is dynamically changed, when only 1 device of the self exists and no other wireless device exists in the wireless ad hoc network environment, the value of the Link _ Num field in the wireless Link information is 0, all the values of the subsequent Link fields do not exist, and the padding is not performed, when a plurality of wireless devices exist in the wireless ad hoc network environment, assuming that the current wireless device is 5, the value of the Link _ Num field in the wireless Link information is 5, the value of the subsequent Link fields is composed of 5 repeated Link fields, and each Link field contains all the contents of the Link field 1.

The wireless topology information values are shown in table 6 below:

table 6:

in the TLV, the length of the message is dynamically changed, when only 1 device of the self exists and no other wireless device exists in the wireless ad hoc network environment, the value of the Neighbor field Neighbor _ Num in the wireless topology information is 0, the values of the Neighbor fields of the subsequent wireless channels do not exist, and the filling is not carried out, when a plurality of wireless devices exist in the wireless ad hoc network environment, the value of the Neighbor field Neighbor _ Num in the wireless topology information is 7 if the current wireless device is 7, the value of the Neighbor field of the subsequent link fields consists of 7 repeated Neighbor fields of the wireless channels, and each Neighbor field of the wireless channels contains all the contents of the Neighbor field 1 of the wireless channel;

3) After wireless information interaction between the packet transmission equipment and the wireless channel equipment, the packet transmission equipment stores the wireless channel equipment information in a local wireless information database, summarizes and reports data information in the database to a packet transmission equipment controller, and the packet transmission equipment controller module customizes and realizes the relation mapping between services and pipelines and message transmission in the services according to user requirements, realizes the creation of different service data streams and the isolation of channel software between different services, and finally carries out pipelined bearing operation on the realized services. When the service enters the pipeline, the service message is bound by a pipeline label for the first time, and a pipeline identifier is added in the header of the service message; when the service leaves the pipeline, the service message is stripped once to recover the original service data flow, in the process of creating the service, the controller system provides a CLI (command line interface) and a GRPC (remote procedure call) interactive interface for the user, supports the user to directly input commands on the local grouping transmission equipment to carry out static pipelining configuration, and simultaneously, the user can realize dynamic pipelining configuration in a mode of remote interface call;

4) The service channel after the change of the wireless channel information changes: after the step 3), a service bearing path (including a normal working path and a redundant protection path) between nodes is manually planned by an upper layer network management center or automatically planned by a packet transport equipment controller, wherein the path includes LSP (label switching value), TUNNEL (TUNNEL) and PW (pseudo wire ID) of all nodes, subsequent services can distribute different priority rules according to services such as character commands, audio, video, pipeline control commands, network management control commands and the like, the rules ensure that an important service data packet is processed in a limited way when the link bandwidth can not meet index requirements, the packet transport equipment receives a corresponding access control authority table and Qos differential service rules to complete end-to-end service transmission, the packet transport equipment acquires information and information in a wireless channel database of the local packet transport equipment by comparing a channel sensing protocol, and updates the information in the wireless channel database after the wireless channel information is changed; the packet transmission equipment triggers a wireless information updating event and transmits the updated wireless channel information to the packet transmission equipment controller, the controller controls the plane to trigger a service updating event according to the latest wireless channel information, the controller plane recalculates a route forwarding path according to the original service plan and issues the latest plan configuration to the related packet transmission equipment in the whole network. And receiving the configured packet transmission equipment, and actively updating the service distribution rule, the bandwidth parameter and the bandwidth flow limit of the equipment according to the configuration result issued by the service, thereby finally realizing the forwarding of the high-priority service.

Claims

1. A topology service sensing method of wireless channel equipment is characterized by comprising the following steps:

1) The packet transmission equipment adopts a two-layer multicast message to complete the discovery of the wireless channel equipment and establish the neighbor relation between the packet transmission equipment and the wireless channel equipment;

2-1) the packet transmission equipment senses the existence of the wireless channel equipment by sending a two-layer multicast message;

2-2) the wireless channel equipment responds to the wireless neighbor discovery message of the packet transmission equipment and informs the packet transmission equipment of the existence of the wireless channel equipment;

3) The upper layer master control network management or the grouping transmission device controller considers to plan the service bearing path between the grouping transmission devices, in the wired and wireless mixed networking, the user business requirement is converted into the access control rule and the service quality grade corresponding to the grouping transmission device, the corresponding service is downloaded to the grouping transmission device in the network through the grouping transmission device controller, and in the receiving grouping transmission device, the service transmission on the wired port and the wireless port is realized according to the service path model sent by the grouping transmission device controller.

2. The topology traffic awareness method of radio channel device according to claim 1, wherein in step 2-2), during the radio channel awareness protocol frame interaction between the packet forwarding device and the radio channel device, the traffic awareness protocol contains different TLV information according to different requests, and the packet forwarding device receives the different TLV information of the radio channel device and then collects and reports the link status information of the device and the neighbor devices of the device to the controller.

3. The topology service sensing method of wireless channel device according to claim 1, wherein in step 3), in a network environment of a wired and wireless hybrid networking, a service system is configured statically to specify a service flow label, a priority of a service flow and a corresponding service flow bandwidth, an upper layer network pipe or a controller creates a plurality of end-to-end pipes according to a service priority, and places service information into different pipes, so as to implement an end-to-end pipe scheduling mechanism and a pipe protection mechanism, and when an unconfigured pipe is used as a reserved configuration pipe, a service switching bearer function of a backup pipe is provided when a working pipe is damaged.

4. The topology service awareness method of wireless channel device according to claim 1, wherein in step 3), the obtaining of dynamic bandwidth information between the packet transfer device and the wireless channel device selects the backup path of the service bearer between the packet transfer device and dynamically adjusts the calculation of the protection path.