CN111405638A - Node N4-U tunnel selection method and device - Google Patents
Node N4-U tunnel selection method and device Download PDFInfo
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Abstract
The invention discloses a method and a device for selecting a node N4-U tunnel, wherein the method comprises the following steps: the CP network element establishes PFCP association with the UP network element and acquires DN server resource information carried by the UP network element; the CP network element constructs and maintains a DN server resource access control table based on DN server resource information carried by the UP network element, and establishes a node N4-U tunnel from the CP network element to the UP network element; and the CP network element executes an algorithm according to the DN server resource access control table and selects a certain node N4-U tunnel to provide data forwarding service. The node N4-U tunnel selection method of the invention is independent of the selection of the UP network element, can execute the selection algorithm through the dynamic real-time monitoring result, quickly and efficiently select the node N4-U tunnel, and realize the signaling message forwarding between the CP network element and the DN through the UP network element.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for selecting a node N4-U tunnel.
Background
One of the major changes in the network architecture of the fifth generation mobile communication system (5G) is represented by: CP (Control Plane) and UP (User Plane) are separated, a User Plane function entity upf (User Plane function) is an UP network element, and a session management function entity smf (session management function) is a CP network element.
In a network architecture of a 5G core network (hereinafter referred to as 5GC), an N4-U tunnel needs to be established between a CP network element and a UP network element for forwarding a data packet between the CP network element and the UP network element. The N4-U tunnels are divided into two categories, one is session related and one is node related (hereinafter referred to as node N4-U tunnel). The node N4-U tunnel is mainly used for forwarding signaling messages such as Radius, Diameter, DHCP and the like between a CP network element and a data network DN (data network) through an UP network element. The 3GPP specification TS29.244 does not specify the selection policy of this type of N4-U tunnel, and it is common practice to keep the same with the selection of UP network elements.
At present, there are many methods for selecting a UP network element (UPF), which are chinese patent application with publication number CN110149675A entitled "a method and apparatus for UPF selection", and a method for UPF selection according to a service ID list supported by UPF is proposed. Chinese patent application with publication number 110740149a, entitled "communication method and apparatus", proposes a communication method for implementing a forwarding path between AN network element and a DN on a UPF network element, but it only relates to a method for indicating a forwarding rule of a UPF to transmit a user stream on the DN side through AN SMF.
However, the selection of the N4-U tunnel is consistent with the selection of the UP network element, and has certain disadvantages. If all UP network elements which need signaling message forwarding establish data link and security management with a Radius server or a DHCP server on the DN side, it is a very big challenge for the UP network elements on the edge side, and if the UP network elements on the edge side can also access the Radius server or the DHCP server on the core side, there are problems of complex network link, high deployment cost, uncontrollable network security, and the like.
Disclosure of Invention
Therefore, the inventor proposes a more flexible method for selecting the node N4-U tunnel; the method is independent of the selection of the UP network element, when PDN conversation is established on the edge side UP network element, the CP network element selects the node N4-U tunnel to the core side UP network element to complete the forwarding of the data packet of the CP network element and the core side DN server. Therefore, the requirement of the capability of deploying and accessing the DN side server on the UP network element at the edge side is avoided, the deployment cost is reduced, the network security is improved, and the complexity of network deployment is simplified.
The embodiment of the application provides a scheme for selecting the N4-U tunnel, which is independent of UP network element selection, safer, more reliable, more flexible and more convenient, and is used for realizing data forwarding service of a CP (provider edge) and a DN (directory name) server. In particular, the amount of the solvent to be used,
in a first aspect, a node N4-U tunnel selection method includes:
the CP network element establishes PFCP association with the UP network element and acquires DN server resource information carried by the UP network element;
the CP network element constructs and maintains a DN server resource access control table based on DN server resource information carried by the UP network element, and establishes a node N4-U tunnel from the CP network element to the UP network element;
and the CP network element executes an algorithm according to the DN server resource access control table and selects a certain node N4-U tunnel to provide data forwarding service.
Further, DN server resource information carried by the UP network element is supported by expanding cells of the PFCP protocol, and the specific contents include but are not limited to: DN server address information and DN server resource type information.
Further, constructing and maintaining a DN server resource access control table specifically includes:
initializing DN server resource access control list record item according to local static configuration information;
and
and constructing a DN server resource access control dynamic record item according to DN server resource information carried by the UP network element.
Further, the constructing and maintaining of the DN server resource access control table specifically includes:
when a new PFCP association is established, if the UP network element carries DN server resource information, a new record item is added in the access control table, or
When PFCP association update occurs, if DN server resource information carried by UP network element changes, deleting old record item and adding new record item in access control list, or
When the PFCP association release occurs, all old entries related to the UP network element are deleted in the access control table.
Preferably, the local static configuration information is preset DN server resource information related to the capability of some UP network elements to access some DN servers.
Further, selecting a certain node N4-U tunnel to provide data forwarding service specifically includes:
determining the number Nup of the currently selectable N4-U tunnels meeting the forwarding condition;
if Nup is equal to 0, stopping the current data forwarding service;
if Nup is 1, selecting the N4-U tunnel to provide data forwarding service;
if Nup > 1, a preferred algorithm is executed, and a certain node N4-U tunnel is preferably used for providing data forwarding service.
Further, executing a preferred algorithm, preferably providing a data forwarding service for a certain node N4-U tunnel, specifically including:
selecting attribute values of N record items TiR1, TiR2,. TiRn of an N4-U tunnel meeting conditions in a DN server resource access control table as key factors, wherein i is 1, 2,. Nup;
a certain weight Q1, Q2,. Qn is defined for each entry, wherein Q1+ Q2+. + Qn equals 100%;
the priority attribute of each eligible N4-U tunnel is calculated according to the following formula:
Vsumi＝TiR1*Q1+TiR2*Q1+...+TiRn*Qn；
the N4-U tunnel with the smallest Vsumi value is selected as the optimal choice for providing data forwarding services.
In a second aspect, an embodiment of the present application further provides a node N4-U tunnel selection apparatus, including:
a node establishing unit, configured to establish a PFCP association with a UP network element, and initiate establishment of a node N4-U tunnel to the UP network element;
the information acquisition unit is used for acquiring DN server resource information carried by the UP network element;
the list management unit is used for constructing and maintaining a DN server resource access control list based on DN server resource information carried by the UP network element;
and the selection algorithm unit is used for executing an algorithm according to the DN server resource access control table and selecting a certain node N4-U tunnel to provide data forwarding service.
In a third aspect, embodiments of the present application further provide a storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the node N4-U tunnel selection method according to various possible implementations described in the foregoing first aspect.
The invention has the following beneficial effects:
compared with the prior art, the node N4-U tunnel selection method is independent of the selection of the UP network element, can quickly and efficiently select the node N4-U tunnel by executing a selection algorithm through a dynamic real-time monitoring result, and realizes the purpose of forwarding a signaling message between a CP network element and a DN through the UP network element.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of the positioning and function of an N4-U tunnel in a 5 GC.
Fig. 2 is a flowchart of a node N4-U tunnel selection method provided in the present application.
Fig. 3 is a flow chart of a manner in which a CP network element obtains DN server resource information carried by an UP network element in the method for selecting a node N4-U tunnel according to the present application.
Fig. 4 is a flowchart of another method for a CP network element to acquire DN server resource information carried by an UP network element in the method for selecting a node N4-U tunnel according to the present application.
Fig. 5 is a flowchart of another method for a CP network element to obtain DN server resource information carried by an UP network element in the method for selecting a node N4-U tunnel according to the present application.
Fig. 6 is a flowchart of another method for a CP network element to obtain DN server resource information carried by an UP network element in the method for selecting a node N4-U tunnel according to the present application.
Fig. 7 is a schematic diagram of a message format of a DN server Resource cell (DNServer Resource IE) defined in the node N4-U tunnel selection method provided in the present application.
Fig. 8 is a flowchart of PDU session secondary authentication and authentication performed in 3GPP specification TS 23.502.
Fig. 9 is a flowchart of a method for selecting a node N4-U tunnel according to the present invention, which is performed in conjunction with a PDU session secondary authentication and authentication process.
Fig. 10 is a schematic structural diagram of a node N4-U tunnel selection device provided in the present application.
Detailed Description
The technical solution of the present application will be described clearly and completely with reference to the following embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application focuses on the selection problem of a node N4-U tunnel, and the node N4-U tunnel is mainly used for forwarding signaling messages such as Radius, Diameter and DHCP between a CP network element (SMF) and a DN through a UP network element (UPF). The tunnel is located between a 5GC network element, an smf (cp) network element, and a upf (up) network element.
In the prior art, for a UP network element that needs to forward a signaling message, a data link and security management need to be established with a Radius server or a DHCP server on a DN side, which is a very big challenge for the UP network element on an edge side.
The method comprises the following steps that when a PDN session is established on an edge side UP network element, a CP network element selects a node N4-U tunnel to a core side UP network element to complete data forwarding of the CP network element and a DN side server. Therefore, the requirement of the capability of deploying and accessing the DN side server on the UP network element at the edge side is avoided, the deployment cost is reduced, the network security is improved, and the complexity of network deployment is simplified. Based on this, the CP network element should grasp the DN server resource condition of the UP network element associated with the CP network element in real time, and can quickly select a proper path from the DN server resource condition to complete data forwarding.
Referring to fig. 1, the UPF1 is located at the core side of the 5GC network, and may directly transmit signaling messages with the Radius server, DHCP server, etc. at the DN side, and the UPF2 is located at the edge side of the 5GC network element, and does not directly transmit signaling messages with the Radius server, DHCP server, etc. at the DN side. At this time, the N4-U tunnel can be selected for data forwarding by the selection method of the node N4-U tunnel. The specific implementation method comprises the following steps:
referring to fig. 2, the method for selecting a node N4-U tunnel according to the present application includes:
step S1: the CP network element establishes PFCP association with the UP network element and acquires DN server resource information carried by the UP network element;
acquiring DN server resource information carried by the UP network element, wherein the acquisition mode comprises any one of the following acquisition modes:
referring to fig. 3, when a CP network element initiates a PFCP association establishment procedure, the CP network element receives an association establishment response message sent by an UP network element, where the response message includes a DN server resource cell;
referring to fig. 4, when the UP network element initiates a PFCP association update procedure, the CP network element receives a PFCP association update request sent by the UP network element, where the request message includes a DN server resource cell;
referring to fig. 5, when the UP network element initiates a PFCP association establishment procedure, the CP network element receives a PFCP association establishment request sent by the UP network element, where the request message includes a DN server resource cell;
referring to fig. 6, when the CP network element initiates a PFCP association update procedure, the CP network element receives a PFCP association update response sent by the UP network element, and the response message includes a DN server resource cell.
Further, DN server resource information carried by the UP network element is supported by expanding cells of the PFCP protocol, and the specific contents include but are not limited to: DN server address information and DN server resource type information.
Specifically, in one embodiment of the present invention, an enhanced UP Resource type DN server Resource element (DNServer Resource IE) is defined by extending the information element of the PFCP protocol. The DN server resource cell is used for representing DN server resource information carried by an UP network element, and specifically includes:
DN server address field identification bit: the device comprises an IPv4address field identification bit V4 and/or an IPv6address field identification bit V6, and is used for identifying whether the IPv4address field and/or the IPv6address field exist or not;
port field identification bit Port: for identifying whether a Port field exists;
DN server resource type identification bit SVRT: for identifying the DN server resource type;
an IPv4address field and/or an IPv6address field: used for recording DN server IPv4address and/or IPv6address associated with UP network element;
port field: a DN server Port for recording UP network element association;
wherein, the IPv4address field and the IPv6address field cannot be simultaneously absent.
Referring to fig. 7, the specific format of DN server Resource element (DNServer Resource IE) is defined as follows:
v4: if the Bit is set to be 1, the IPv4address item should exist, otherwise, the IPv4address item is not included;
v6: if the Bit is set to be 1, the IPv6address item should exist, otherwise, the IPv6address item is not included;
PORT: if the Bit is set to 1, a Port entry should exist, otherwise, no Port entry is included;
SVRT: bit4-7 represents DN server resource type, 0 represents unknown type, 1 represents Radius, 2 represents DHCP, and other values are not defined temporarily;
wherein, the V4 mark and the V6 mark can not be 0 at the same time;
port field: 2 bytes for recording DN server Port associated with UP network element
IPv4address field: 4 bytes for recording DN server IPv4address associated with UP network element;
IPv6address field: 16 bytes for recording DN server IPv6address associated with UP network element.
Step S2: the CP network element constructs and maintains a DN server resource access control table based on DN server resource information carried by the UP network element, and establishes a node N4-U tunnel from the CP network element to the UP network element;
first, referring to the DN server resource access control table format defined in table 1, entries of the DN server resource access control table include, but are not limited to: DNN (data network name), DN server address, DN server type, DN server load, UP network element name, average response delay, UP network element load, status.
Table 1 DN server resource access control table format
Specifically, constructing and maintaining a DN server resource access control table includes:
step S201: initializing DN server resource access control list record item according to local static configuration information; the local static configuration information is DN server resource information which is related to the capability of some preset UP network elements for accessing some DN servers. According to the needs and the operation characteristics of network deployment, the ability of some UP network elements to access some DN servers is preset and the UP network elements are configured in a DN server resource access control table, so that some key services can be guaranteed to be processed preferentially, and the network flexibility is further enhanced.
Step S202: and constructing a DN server resource access control dynamic record item according to DN server resource information carried by the UP network element. The specific process is as follows:
the CP network element compares the DNN and the associated DN server address and DN server type of the DNN with the DN server address and DN server type contained in the DN server resource information carried by the UP network element, if the matching is successful, the UP network element name is filled into the DN server resource access control list record item, and the state is marked; wherein ok is available state, error is unavailable state;
the CP net element real-timely checks the health state between the UP net element and the UP net element, and real-timely updates the state to the state record item of the DN server resource access control list. When the health state check between the CP network element and the UP network element fails, the CP network element updates the state record item related to the UP network element to be error, and when the health state between the CP network element and the UP network element is recovered to be normal, the CP network element updates the state record item related to the UP network element to be ok;
the CP network element regularly inquires the DN server or counts the DN server load condition according to the local use condition, and updates the data of the CP network element to a DN server load record item in a DN server resource access control table in real time;
when the PFCP messages are interacted, the CP network element receives the load condition reported by the UP and updates the data thereof to a UP network element load record item of a DN server resource access control table in real time;
the CP net element regularly counts the average time delay of communication response between a certain time period and the DN server, and updates the data of the average time delay to the average response time delay record item of the DN server resource access control list in real time.
Further, the step S2 includes: the CP network element maintains a DN server resource access control list entry according to the obtained DN server resource information carried by the UP network element, and specifically includes:
when a new PFCP association is established, if the UP network element carries DN server resource information, a new record item is added in the access control table, or
When PFCP association update occurs, if DN server resource information carried by UP network element changes, deleting old record item and adding new record item in access control list, or
When the PFCP association release occurs, all old entries related to the UP network element are deleted in the access control table.
It should be noted that, in particular, the 3GPP specification does not define the creation time of the node N4-U tunnel, and in the specific implementation process, the node N4-U tunnel may be created in advance after the CP network element establishes the PFCP association with the UP network element, or the node N4-U tunnel to the UP may be created before a certain UP network element needs to be selected to provide the data forwarding service.
Step S3: the CP net element executes an algorithm according to the DN server resource access control table, and selects a certain node N4-U tunnel to provide data forwarding service; the method specifically comprises the following steps:
step S301: determining the number Nup of the currently selectable N4-U tunnels meeting the forwarding condition;
specifically, record items meeting the forwarding condition in the DN server resource access control table are traversed, and the number Nup of the record items is counted.
Step S302: if Nup is equal to 0, stopping the current data forwarding service;
step S303: if Nup is 1, selecting the N4-U tunnel to provide data forwarding service;
referring to table 1, when a CP network element needs a RADIUS server associated with dnn1 to perform data forwarding service, if only an N4-U tunnel between the UP1 network element is available in a current DN server resource access control table entry, the N4-U tunnel is selected to provide data forwarding service;
step S304: if Nup > 1, a preferred algorithm is executed, and a certain node N4-U tunnel is preferably used for providing data forwarding service. The method specifically comprises the following steps:
step S3041: selecting attribute values of N record items TiR1, TiR2,. TiRn of an N4-U tunnel meeting conditions in a DN server resource access control table as key factors, wherein i is 1, 2,. Nup;
the selection of the related entries as the key factors can be determined according to the requirements of the operator for network communication, see table 1, and the embodiment selects three attributes of UP network element load UP L oad, DN Server load Server L oad and average corresponding time delay AVEDelay as the key factors.
Step S3042: a certain weight Q1, Q2,. Qn is defined for each entry, wherein Q1+ Q2+. + Qn equals 100%;
referring to table 1, in this embodiment, taking the total weight 100 as an example, the weight assigned to the Server L load attribute is Psload-30, the weight assigned to the UP L load attribute is Puload-30, and the rest is assigned to the AVEDelay attribute Padelay-40.
Step S3043: the priority attribute of each eligible N4-U tunnel is calculated according to the following formula:
Vsumi＝TiR1*Q1+TiR2*Q1+...+TiRn*Qn；
corresponding to the foregoing setting of this embodiment, referring to table 1, when the CP network element needs the DHCP server associated with dnn1 to perform data forwarding service, two N4-U tunnels between the UP3 and UP4 network elements are available in the current DN server resource access control table entry, and their priority attributes are calculated respectively:
regarding UP 3: vsum3 ═ 50% + 30% + 15% + 40%;
regarding UP 4: vsum4 ═ 50% + 30% + 60% + 30% +20 × 40%;
step S3044: the N4-U tunnel with the smallest Vsumi value is selected as the optimal choice for providing data forwarding services.
Corresponding to the foregoing arrangement of the present embodiment, see Table 1, Vsum3 < Vsum4 is calculated as described above. The N4-U tunnel with the UP3 is finally selected to provide data forwarding services.
The following further describes the process of node N4-U tunnel selection in the present application, taking as an example the PDU session establishment procedure initiated by UE as set forth in section 4.3.2.2.1 of 3GPP specification TS 23.502; referring to step 6 of the flow chart in section 4.3.2.2.1, if the DNN requirement corresponding to the current PDN session is met, performing secondary authentication and authentication of the PDU session; then the secondary authentication flow described in fig. 8 needs to be executed (see TS23.502, section 4.3.2.3):
referring to the flowchart of fig. 8, before performing step 2, cp (smf) needs to perform a node N4-U tunnel selection process, and then forward the authentication packet; the detailed selection process is shown in fig. 9:
the method comprises the following steps: and the CP receives a request for establishing a session of the PDN, and determines whether to initiate a secondary authentication request according to DNN configuration data:
if not, skipping the tunnel selection process of the node N4-U and continuing the subsequent flow processing;
if yes, entering the step two;
step two: acquiring the address of the server executing the secondary authentication, and executing the query operation of a DN server resource access control table:
if the number of UP nodes meeting the conditions is found to be 0, the establishing process is terminated;
if the number of UP nodes meeting the condition is found to be more than 1, executing a step three, and if the number of UP nodes meeting the condition is found to be equal to 1, executing a step four;
step three: executing the optimized algorithm provided by the patent to the record items meeting the forwarding condition, selecting an optimal record item, and continuously executing the step four;
step four: acquiring node N4-U tunnel information corresponding to the optimal selection record item; the subsequent flow processing is continued.
In summary, the present patent proposes a method, which implements a node N4-U tunnel selection function in a scenario that a node-related N4-U tunnel is required to be used for performing a packet forwarding capability between a CP network element (SMF) and a DN-side server, where the selection function is independent of a UP selection and does not interfere with each other, and the method has the beneficial effects that the forwarding function of non-session-related packets can be uniformly handed over to a plurality of UPs deployed on a core side to complete the forwarding; the deployment difficulty of the edge UP is liberated, the network complexity and the deployment cost are reduced, and meanwhile, the requirement that the edge UP accesses the core DN server is avoided physically, so that the access safety of the core DN server is effectively ensured. Meanwhile, the optimization algorithm is used, and the network operation efficiency is improved to the maximum extent.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
In the embodiment of the present application, the node N4-U tunnel selection device may be divided into functional modules according to the method embodiment, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The division of the modules in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
The present application further provides a node N4-U tunnel selection apparatus, as shown in fig. 10, including:
a node establishing unit 1001, configured to establish a PFCP association with a UP network element, and initiate establishment of a node N4-U tunnel to the UP network element;
an information obtaining unit 1002, configured to obtain DN server resource information carried by an UP network element;
a list management unit 1003, configured to construct and maintain a DN server resource access control table based on DN server resource information carried by the UP network element;
and the selection algorithm unit 1004 is used for executing an algorithm according to the DN server resource access control table, and preferably, a certain node N4-U tunnel provides data forwarding service.
The present application further provides a storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the node N4-U tunnel selection method according to the foregoing various possible embodiments.
It should be noted that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it is obvious for those skilled in the art to make other variations or modifications based on the above description, and not to exhaust all embodiments, and all obvious variations or modifications that belong to the technical solutions of the present invention are still within the protection scope of the present invention.
Claims (9)
1. A node N4-U tunnel selection method is characterized by comprising the following steps:
the CP network element establishes PFCP association with the UP network element and acquires DN server resource information carried by the UP network element;
the CP network element constructs and maintains a DN server resource access control table based on DN server resource information carried by the UP network element, and establishes a node N4-U tunnel from the CP network element to the UP network element;
and the CP network element executes an algorithm according to the DN server resource access control table and selects a certain node N4-U tunnel to provide data forwarding service.
2. The node N4-U tunnel selection method of claim 1, wherein DN server resource information carried by the UP network element is supported by expanding cells of a PFCP protocol, and the specific contents include but are not limited to: DN server address information and DN server resource type information.
3. The method for selecting a node N4-U tunnel according to claim 1, wherein the constructing and maintaining a DN server resource access control table specifically includes:
initializing DN server resource access control list record item according to local static configuration information; and
and constructing a DN server resource access control dynamic record item according to DN server resource information carried by the UP network element.
4. The node N4-U tunnel selection method of claim 3, wherein the constructing and maintaining DN server resource access control table specifically comprises:
when a new PFCP association is established, if the UP network element carries DN server resource information, a new record item is added in the access control table, or
When PFCP association update occurs, if DN server resource information carried by UP network element changes, deleting old record item and adding new record item in access control list, or
When the PFCP association release occurs, all old entries related to the UP network element are deleted in the access control table.
5. The node N4-U tunnel selection method of claim 4, wherein the local static configuration information is DN server resource information associated with the capability of accessing some DN servers by some preset UP network elements.
6. The method for selecting the N4-U tunnel according to claim 1, wherein selecting a certain N4-U tunnel to provide data forwarding service specifically comprises:
determining the number Nup of the currently selectable N4-U tunnels meeting the forwarding condition;
if Nup is equal to 0, stopping the current data forwarding service;
if Nup is 1, selecting the N4-U tunnel to provide data forwarding service;
if Nup > 1, a preferred algorithm is executed, and a certain node N4-U tunnel is preferably used for providing data forwarding service.
7. The node N4-U tunnel selection method according to claim 6, wherein an optimization algorithm is executed, preferably a node N4-U tunnel provides a data forwarding service, and specifically comprises:
selecting attribute values of N record items TiR1, TiR2,. TiRn of an N4-U tunnel meeting conditions in a DN server resource access control table as key factors, wherein i is 1, 2,. Nup;
a certain weight Q1, Q2,. Qn is defined for each entry, wherein Q1+ Q2+. + Qn equals 100%;
the priority attribute of each eligible N4-U tunnel is calculated according to the following formula:
Vsumi＝TiR1*Q1+TiR2*Q1+...+TiRn*Qn；
the N4-U tunnel with the smallest Vsumi value is selected as the optimal choice for providing data forwarding services.
8. A node N4-U tunnel selection apparatus, comprising:
a node establishing unit, configured to establish a PFCP association with a UP network element, and initiate establishment of a node N4-U tunnel to the UP network element;
the information acquisition unit is used for acquiring DN server resource information carried by the UP network element;
the list management unit is used for constructing and maintaining a DN server resource access control list based on DN server resource information carried by the UP network element;
and the optimization algorithm unit is used for executing an algorithm according to the DN server resource access control table, and preferably selecting a certain node N4-U tunnel to provide data forwarding service.
9. A storage medium having stored thereon a computer program, characterized in that the computer program, when being executed by a processor, implements the node N4-U tunnel selection method according to any one of claims 1-7.
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