CN117580190A - N19 interface multipath transmission system and method based on 5G LAN architecture - Google Patents
N19 interface multipath transmission system and method based on 5G LAN architecture Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
Abstract
The invention belongs to the field of 5G communication, and particularly relates to an N19 interface multipath transmission system and method based on a 5G LAN architecture. After receiving the session request message, the SMF issues a session establishment request message to the UPF, and issues N19 path transmission rules related to the session; after the N19 tunnel is established, the SMF receives tunnel link conditions detected by the UPF, dynamically updates N19 path allocations of different service types, and informs the UPF to modify forwarding rules. The UPF establishes a plurality of N19 tunnel links with all other UPFs in the 5GLAN networking respectively according to the pre-configuration information, and carries out link detection on each N19 link, and the link quality condition is reported to the SMF; meanwhile, under the condition that the N19 interface has multiple paths, different links are selected for sending the data messages which need to be communicated across 5G through the N19 interface according to SMF issuing rules or local predefined rules. The invention improves the reliability and fault tolerance of transmission by adding the N19 transmission channel, so that the communication service is more stable and reliable under emergency and extreme scenes.
Description
Technical Field
The invention belongs to the field of 5G communication, and particularly relates to an N19 interface multipath transmission system and method based on a 5G LAN architecture.
Background
With the development of mobile communication, satellite communication and microwave communication technologies are also coming into new development opportunities, and the combined networking of 5G, satellite communication and microwave communication is a trend in certain vertical fields. Ground mobile communication has limitations in some areas with severe environments, and mobile satellite communication and microwave communication can make up for the shortages of the ground mobile communication system. Both the satellite mobile communication system and the ground mobile communication system need to build a customizable, manageable and highly reliable local private network for clients, and a satellite and microwave converged communication architecture based on a 5G LAN is an important solution idea. And each PSA establishes an N19 tunnel link according to the configuration to form a local area network. The UPF can establish a plurality of N19 tunnel links based on a plurality of channel carriers, and select a proper path for transmission according to the message type, so that different link characteristics are utilized efficiently, and the communication advantage of each link is exerted; for the service with extremely high reliability requirement, redundant transmission can be performed on a plurality of paths, so that the success rate of data transmission is greatly improved.
Disclosure of Invention
In order to solve the problem of N19 interface transmission of a 5G LAN in a 5G, satellite communication and microwave communication fusion transmission system, the invention provides an N19 interface multipath transmission system and method based on a 5G LAN architecture, wherein an N19 interface respectively establishes an N19 link on three links of a 5G IAB, satellite communication and microwave communication, and a 5GC selects different links for transmission by identifying the service type of a message.
The invention is realized by adopting the following technical scheme:
an N19 interface multipath transmission system based on a 5G LAN architecture, comprising:
user Equipment (UE) is various terminals in 5G, and belongs to a certain 5G VN;
the access and mobile management module AMF is used for network access of the user equipment UE;
the session management module SMF is used for managing the session of the UE and transmitting an N19 path forwarding rule to the user plane module UPF according to the related information of the UE; the method is also used for receiving tunnel link conditions detected by the UPF after the N19 link is established, dynamically updating N19 path allocations of different service types, and sending session modification information to the UPF to inform the UPF of modifying forwarding rules;
the user plane module UPF is used for respectively establishing three N19 link bearers with other multi-path transmission systems through the NG-RAN, the first communication module and the second communication module according to the pre-configuration information; after the link is established, the UPF performs link detection on each N19 link and reports the link quality condition to the SMF; the method is also used for providing multipath forwarding service of an N19 link for UE service according to a local configuration logic judgment rule or a path forwarding rule issued by SMF, so that the UE selects different N19 links for transmission according to service characteristics in data flows of different service scenes;
a radio base station NG-RAN for providing an N19 link bearer for the user plane module UPF by means of an IAB function;
the first communication module and the second communication module are respectively used for providing an N19 link bearer for the user plane module UPF.
Further, the first communication module is a satellite communication module, and the second communication module is a microwave communication module.
The N19 interface multipath transmission method based on the 5G LAN architecture is realized based on the system and comprises the following steps:
step one: after the UPF is started, the corresponding multi-path pre-configuration information is read, wherein the configuration information comprises local N19 multi-path node information and all opposite-end multi-path node information; the UPF establishes three N19 links with UPFs of other multi-path transmission systems respectively through the NG-RAN, the first communication module and the second communication module according to the configuration information;
step two: the UPF initiates an N19 interface path detection flow to all opposite ends one by one according to a configured opposite end UPF linked list, path detection is carried out by receiving and transmitting path detection messages, link quality information of three N19 links is obtained according to the path detection messages, the link quality information comprises on-off conditions, link delay and packet loss rate, and the links are sequenced according to the obtained link quality information and link characteristics; when a path detection message on a certain N19 link does not respond for a designated number of times, the corresponding N19 link is considered to enter a broken link state, and a UPF marks the broken link; if the SMF transmits a forwarding rule, the UPF periodically reports the link condition to the SMF;
step three: when a UE to which the 5G LAN belongs initiates a session request, the SMF processes the session request, and under the non-predefined condition, the SMF dynamically updates an N19 path forwarding rule to the UPF in a session modification request mode according to the link quality condition reported by the UPF, and the UPF selects an N19 link to send a data message according to the path forwarding rule; under the condition of a predefined rule, the UPF dynamically selects an N19 link to send a data message according to the link condition and the predefined logic judgment rule.
Further, in the third step, under the condition of the predefined rule, the UPF dynamically selects the N19 link to send the data packet according to the link condition and the predefined logic judgment rule, and the specific process is as follows:
the UPF processes the data message, and when the data message needs to be transmitted across 5G, the UPF judges the priority of the data packet according to the link condition and the predefined logic judgment rule:
when the message priority is 0 level, the message is sent on all N19 links which are not broken;
when the message priority is 1 level, if the satellite communication link is not broken, selecting the satellite communication link and the optimal link outside the satellite communication for transmission; if the satellite communication link is broken, transmitting the satellite communication link on the N19 links which are not broken;
and when the message priority is 2 levels, selecting an optimal link outside the satellite communication link for transmission.
The invention has the following beneficial technical effects:
according to the N19 interface multipath transmission method based on the 5G LAN architecture, on the basis of the original 5G LAN, the reliability and fault tolerance of transmission are improved by adding the N19 transmission channel, so that the communication service is more stable and reliable under emergency conditions and extreme scenes. On the basis, by combining a packet detection technology and a link detection technology, the 5GC can provide different links for different services, and the advantages of each link can be better exerted; for high priority service, the invention can provide redundant transmission on multiple links, and greatly improves the success rate of data transmission.
The N19 interface multipath transmission method based on the 5G LAN architecture has the characteristics of easy expansion and customization, and in the scheme, the N19 interface and the transmission medium are decoupled, so that the system can be flexibly expanded according to the networking mode, no additional change is needed, and the system expansion cost is reduced. On the basis, the rule of service link selection can be configured according to the actual use requirement of a user, and the application and development of the 5G LAN service in the vertical industry can be effectively ensured and promoted.
Drawings
Fig. 1 is a diagram of a 5g LAN n19 interface multipath transmission system architecture according to the present invention.
Fig. 2 is a schematic diagram of a network of the multipath transmission system of the 5g LAN n19 interface of the present invention.
Fig. 3 is a flow chart of UPF initialization and path detection of the present invention.
Detailed Description
The present invention will be described in further detail below.
As shown in fig. 1, the 5g LAN n19 interface multipath transmission system includes:
user Equipment (UE) is various terminals in 5G, and belongs to a certain 5G VN;
the access and mobile management module AMF is used for network access of the user equipment UE;
the session management module SMF is used for managing the session of the UE and transmitting an N19 path forwarding rule to the user plane module UPF according to the related information of the UE; the method is also used for receiving tunnel link conditions detected by the UPF after the N19 link is established, dynamically updating N19 path allocations of different service types, and sending session modification information to the UPF to inform the UPF of modifying forwarding rules;
the user plane module UPF is used for respectively establishing three N19 link bearers with other multi-path transmission systems through the NG-RAN, the satellite communication module and the microwave communication module according to the pre-configuration information; after the link is established, the UPF performs link detection on each N19 link and reports the link quality condition to the SMF; the multi-path forwarding service of the N19 link is provided for the UE service according to a local configuration rule or a forwarding rule issued by the SMF, so that the UE selects different N19 links for transmission according to service characteristics in data flows of different service scenes;
a radio base station NG-RAN for providing an N19 link bearer for the user plane module UPF by means of an IAB function;
a first communication module (in this embodiment, a satellite communication module) for providing an N19 link bearer for the user plane module UPF through satellite communication;
the second communication module (in this embodiment, a microwave communication module) is configured to provide an N19 link bearer for the user plane module UPF through microwave communication.
Ext> asext> shownext> inext> fig.ext> 2ext>,ext> theext> networkext> isext> composedext> ofext> threeext> systemsext> 5ext> Gext> -ext> aext>,ext> 5ext> Gext> -ext> bext> andext> 5ext> Gext> -ext> cext>,ext> eachext> ofext> whichext> establishesext> anext> next> 19ext> linkext> throughext> ngext> -ext> ranext>,ext> microwaveext> communicationext> andext> satelliteext> communicationext> andext> theext> remainingext> twoext> systemsext>.ext> On each path, the UPF collects link quality information such as link delay, link on-off and the like through a detection message, and sends data according to the link quality information and forwarding rules.
The specific working steps are as follows:
the system comprises the following specific working steps:
step one: as shown in the initialization part of fig. 3, the UPF reads the corresponding multi-path preconfiguration information after startup, where the multi-path preconfiguration information includes local N19 multi-path node information and all the multi-path node information of the opposite ends. The UPF establishes three N19 links according to the multipath information and other UPFs in the 5G LAN respectively, and prepares for subsequent N19 link path detection and data transmission.
Step two: as shown in the N19 link path detection in fig. 3, after the UPF completes the initialization procedure, the UPF initiates an N19 interface path detection procedure to all the opposite ends one by one according to the configured opposite end UPF linked list. The path detection is carried out by receiving and transmitting path detection messages, according to the path detection messages, the UPF can obtain link quality information such as the on-off condition, the link delay, the packet loss rate and the like of three N19 links, and the links are ordered according to the obtained link quality information and the link characteristics. When a path detection message on a certain N19 link does not respond for a designated number of times, the N19 link is considered to enter a broken link state, the UPF marks the broken link, the link is not selected to send the message, and then the link detection is carried out in a lower period until the link is recovered. If the SMF transmits the forwarding rule, the UPF periodically reports the link status to the SMF.
Step three: when a UE to which the 5G LAN belongs initiates a session request, the SMF processes the session request, and under the non-predefined condition, the SMF dynamically updates an N19 path forwarding rule to the UPF in a session modification request mode according to the link quality condition reported by the UPF, and the UPF selects an N19 link to send a data message according to the path forwarding rule; under the condition of a predefined rule, the UPF dynamically selects an N19 link to send a data message according to the link condition and the predefined logic judgment rule.
In the case of predefined rules, the specific flow is as follows:
and 1, processing the data message by UPF, and judging whether the UE belongs to a certain 5G VN or not, and whether the data packet needs to be transmitted across 5G or not. If the cross-5G transmission is not needed, processing is performed according to the original flow.
2. If the data message needs to be transmitted by crossing 5G, further processing the data message, judging the priority of the data message according to the link condition and the predefined logic judgment rule, and carrying out different sending processes according to different priorities. A simple example of message priority and processing scheme is given here:
1) Message priority 0 level: transmitted over all N19 links of the existing unbroken link.
2) Message priority 1 level: if the satellite communication link is not broken, selecting the satellite communication link and the optimal link outside the satellite communication for transmission; if the satellite communication link is broken, it is sent on the remaining unbroken N19 links.
3) Message priority 2 level: and selecting an optimal link outside the satellite communication link for transmission.
3. Because there may be a case of redundant transmission, when the receiving end UPF receives the N19 interface packet, it needs to record the sequence number in the tunnel header, and if the packet represented by the sequence number has already been received, the packet that is received repeatedly is discarded.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be covered by the present invention, and the scope of the present invention shall be defined by the appended claims.
Claims (5)
1. An N19 interface multipath transmission system based on a 5G LAN architecture, comprising:
user Equipment (UE) is various terminals in 5G, and belongs to a certain 5G VN;
the access and mobile management module AMF is used for network access of the user equipment UE;
the session management module SMF is used for managing the session of the UE and transmitting an N19 path forwarding rule to the user plane module UPF according to the related information of the UE; the method is also used for receiving tunnel link conditions detected by the UPF after the N19 link is established, dynamically updating N19 path allocations of different service types, and sending session modification information to the UPF to inform the UPF of modifying forwarding rules;
the user plane module UPF is used for respectively establishing three N19 link bearers with other multi-path transmission systems through the NG-RAN, the first communication module and the second communication module according to the pre-configuration information; after the link is established, the UPF performs link detection on each N19 link and reports the link quality condition to the SMF; the method is also used for providing multipath forwarding service of an N19 link for UE service according to a local configuration logic judgment rule or a path forwarding rule issued by SMF, so that the UE selects different N19 links for transmission according to service characteristics in data flows of different service scenes;
a radio base station NG-RAN for providing an N19 link bearer for the user plane module UPF by means of an IAB function;
the first communication module and the second communication module are respectively used for providing an N19 link bearer for the user plane module UPF.
2. The N19 interface multipath transmission system based on 5G LAN architecture according to claim 1, wherein the first communication module is a satellite communication module and the second communication module is a microwave communication module.
3. An N19 interface multipath transmission method based on a 5G LAN architecture, which is characterized by being implemented based on the system of claim 1 or 2, and specifically comprising the following steps:
step one: after the UPF is started, the corresponding multi-path pre-configuration information is read, wherein the configuration information comprises local N19 multi-path node information and all opposite-end multi-path node information; the UPF establishes three N19 links with UPFs of other multi-path transmission systems respectively through the NG-RAN, the first communication module and the second communication module according to the configuration information;
step two: the UPF initiates an N19 interface path detection flow to all opposite ends one by one according to a configured opposite end UPF linked list, path detection is carried out by receiving and transmitting path detection messages, link quality information of three N19 links is obtained according to the path detection messages, the link quality information comprises on-off conditions, link delay and packet loss rate, and the links are sequenced according to the obtained link quality information and link characteristics; when a path detection message on a certain N19 link does not respond for a designated number of times, the corresponding N19 link is considered to enter a broken link state, and a UPF marks the broken link; if the SMF transmits a forwarding rule, the UPF periodically reports the link condition to the SMF;
step three: when a UE to which the 5G LAN belongs initiates a session request, the SMF processes the session request, and under the non-predefined condition, the SMF dynamically updates an N19 path forwarding rule to the UPF in a session modification request mode according to the link quality condition reported by the UPF, and the UPF selects an N19 link to send a data message according to the path forwarding rule; under the condition of a predefined rule, the UPF dynamically selects an N19 link to send a data message according to the link condition and the predefined logic judgment rule.
4. The method for multipath transmission over an N19 interface based on a 5G LAN architecture according to claim 3, wherein the first communication module is a satellite communication module, and the second communication module is a microwave communication module.
5. The multi-path transmission method of an N19 interface based on a 5G LAN architecture according to claim 3, wherein in the third step, under the condition of a predefined rule, the UPF dynamically selects the N19 link to send the data packet according to the link condition and the predefined logic judgment rule, and the specific process is as follows:
the UPF processes the data message, and when the data message needs to be transmitted across 5G, the UPF judges the priority of the data packet according to the link condition and the predefined logic judgment rule:
when the message priority is 0 level, the message is sent on all N19 links which are not broken;
when the message priority is 1 level, if the satellite communication link is not broken, selecting the satellite communication link and the optimal link outside the satellite communication for transmission; if the satellite communication link is broken, transmitting the satellite communication link on the N19 links which are not broken;
and when the message priority is 2 levels, selecting an optimal link outside the satellite communication link for transmission.
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