CN111432439B - UPF data plane extension and system thereof - Google Patents

UPF data plane extension and system thereof Download PDF

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CN111432439B
CN111432439B CN202010226733.2A CN202010226733A CN111432439B CN 111432439 B CN111432439 B CN 111432439B CN 202010226733 A CN202010226733 A CN 202010226733A CN 111432439 B CN111432439 B CN 111432439B
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CN111432439A (en
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苏子威
秦海
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Guangzhou Aipu Road Network Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract

The invention discloses a UPF data surface expanding method and a system thereof, wherein the system comprises a control processing entity CPE and at least one data processing entity DPE, and also comprises a storage device and a routing device; the control processing entity CPE and the data processing entity DPE adopt a communication protocol to transmit messages; the data processing entity DPE is provided with an independent N3/N6/N9 interface; the control processing entity CPE performs signaling interaction with the SMF on one hand, and selects a target data processing entity as an attachment point for establishing a user session on the other hand; the storage device stores node information and capability information of the data processing entity DPE, and the node information and the capability information are read to the control processing entity CPE; and the routing device decides to select the DPE for subsequently processing the downlink data according to the mapping relation between the IP address of the user terminal distributed in the establishing process of the CPE synchronous session and the IP of the N6 interface of the target DPE attached to the session.

Description

UPF data plane extension and system thereof
Technical Field
The invention relates to the technical field of communication, in particular to a UPF data plane extension and a system thereof.
Background
In a 5G network, if a UPF network element control plane and a user plane adopt a centralized deployment mode, the system throughput rate required under a specific application scene cannot be achieved when the hardware and the system performance of a single server are limited; in addition, there is also high coupling between the control plane and the user plane, especially in the scenario where the openness of the current N4 interface is not very standard, so that the network link is complex, not easy to maintain, and unable to flexibly expand capacity and have poor scalability.
The patent solutions currently disclosed in connection with UPF management are: the method, the device and the system for managing the UPF by the CN108307402A describe a UPF selection method in UPF concentration, and solve the problem of UPF dynamic adjustment; the CN110022580A establishment bearing method and device describe that in a 4G scene, a proper one of establishment bearing information is selected according to the load information of each service processing unit in the UPF, and the problem of UPF expansibility is not mentioned.
Disclosure of Invention
The invention provides a UPF data plane extension and a system thereof, which aim to solve the problems in the background technology.
In a first aspect, a method for extending a UPF data plane is provided, in which a UPF is divided into a control processing entity CPE and at least one data processing entity DPE; the CPE is responsible for interacting signaling messages with a session management function SMF and managing DPE through a storage device, the DPE is responsible for main service processing and data forwarding and is provided with an independent N3/N6/N9 interface; the control processing entity CPE and the data processing entity DPE adopt a communication protocol to transmit messages; the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment. The node information and the capability information of the data processing entity DPE are registered in a storage device; and the control processing entity CPE reads the node information and the capability information from the storage device and uploads the node information and the capability information to the SMF entity.
Specifically, the CPE selects a target data processing entity DPE as an attachment point for session establishment in two ways:
the first method comprises the following steps: SMF-based DPE selection, comprising SMF acquisition of a target DPE:
the SMF entity receives the node information and the capability information of the DPE reported by the CPE;
the SMF entity calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing;
and the SMF entity compares whether the DPE has the capability support according to the user IP attribute and the accessed APN in the session establishment, if so, the DPE corresponding to the first priority of the DPE priority set is the target DPE, and if not, the SMF entity judges according to the DPE corresponding to the second priority until the target DPE is obtained.
After the SMF entity acquires the target DPE, the SMF entity informs the CPE of relevant information about the target DPE, the SMF entity searches TEID resources and UEIP resources corresponding to the target DPE, and sends the TEID resources and the UEIP resources to the CPE through a session establishment request message; and the control processing entity CPE locks a target data processing entity DPE as an attachment point for session establishment through the TEID resource.
And the second method comprises the following steps: CPE-based DPE selection
The method comprises the steps that CPE acquires and locks a target DPE, and comprises the following steps: the CPF calculates the load of the DPE currently in a normal state, and the DPE is sequenced to obtain a DPE priority set; and the DPE entity corresponding to the first priority of the DPE priority set is a target DPE serving as an attachment point for session establishment.
In this decision manner, the CPE is required to inform the SMF of its support for locally allocating F-TEID resources through a corresponding information element in an association setup request message or an association setup response message. Each time of user session establishment, the SMF initiates two PFCP session establishment processes to the CPE, the first session establishment process is that the SMF acquires the node information which is reported by the CPE and is decided by the CPE locally and used as the DPE attached in the second user session establishment process, the SMF goes to the PCF to acquire the user subscription and strategy related information in the second session establishment process, the strategy and the DPE node information reported by the CPE in the first session establishment are carried in the establishment request message, and the user session is correctly established on the target DPE after the CPE receives and confirms the message.
Further, the SMF and the CPE carry user plane data unit cells through an extended PFCP protocol, and the capability information used for extending the interactive DPE set between the SMF and the CPE is used, such as IP of each DPE, TEID range used, maximum number of supported sessions, supported DNN, and supported processing static or dynamic user IP.
Furthermore, the CPE receives the DPE status exception information reported by the storage device, locally updates the status information of the DPE and encodes the user plane data unit cell, and sends an association update message to notify the SMF of the DPE status exception.
Further, the present invention also provides a routing device for implementing routing of downstream data, so as to implement N6 interface selection of DPE, and CPE and the routing device synchronously update network link information of DPE to CPE by establishing neighbor relation. When the user session is successfully established, the CPE establishes a mapping relation between the IP address of the user terminal distributed in the session establishing process and the IP address of the N6 interface of the target DPE attached to the session, and the CPE synchronizes the mapping relation to the routing device; and the routing device selects the DPE for subsequently processing the downlink data according to the mapping relation decision.
Furthermore, session related messages are interacted between the CPE and the DPE in a mode of self-defining RPC. The CPE and the DPE set interact the conversation related information in a self-defined RPC mode, the realization of the mode adopts the combination of UDP communication and data serialization, the CPE side decodes the conversation related information and stores the conversation related information in a general conversation data structure, when sending the conversation information of different types, only different parts of data need to be stored on the specific data structure of the conversation, such as the conversation establishing information, and the general conversation data structure and the conversation establishing data structure are adopted. And then constructing a session message data structure to be sent, constructing a general message structure head and adding a serial number identifier, then carrying out data serialization, transmitting to a corresponding DPE (distributed processing element) or DPE through UDP (user datagram protocol), and sending to CPE (customer premises equipment).
In a second aspect, a UPF data plane extension system is provided, including: the system comprises a control processing entity CPE and at least one data processing entity DPE, and further comprises a storage device and a routing device; the control processing entity CPE and the data processing entity DPE adopt a communication protocol to transmit messages; the data processing entity DPE is provided with an independent N3/N6/N9 interface; the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment and carries out signaling interaction with the SMF entity; the storage device stores node information and capability information of the data processing entity DPE, and the node information and the capability information are read to the control processing entity CPE; and the routing device decides to select the DPE for subsequently processing the downlink data according to the mapping relation between the IP address of the user terminal distributed in the establishing process of the CPE synchronous session and the IP address of the N6 interface of the target DPE attached to the session.
In a third aspect, an SMF entity is provided, where the SMF entity obtains a target DPE, and includes the SMF entity receiving node information and capability information of the DPE reported by a control processing entity CPE; the SMF entity calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing; and the SMF entity compares whether the DPE has the capability support according to the user IP attribute and the accessed APN in the session establishment, if so, the DPE corresponding to the first priority of the DPE priority set is the target DPE, and if not, the SMF entity judges according to the DPE corresponding to the second priority until the target DPE is obtained.
After the SMF entity acquires the target DPE, the SMF entity informs the CPE of relevant information about the target DPE, the SMF entity searches TEID resources and UEIP resources corresponding to the target DPE, and sends the TEID resources and the UEIP resources to the CPE through a session establishment request message; and the control processing entity CPE locks a target data processing entity DPE as an attachment point for session establishment through the TEID resource.
In a fourth aspect, a CPE entity is provided, where the CPE entity is responsible for performing interaction of signaling messages with a session management function SMF and managing a DPE through a storage device, where a control processing entity CPE and the data processing entity DPE use a communication protocol to transmit messages, the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment, and node information and capability information of the data processing entity DPE are registered in the storage device; and the control processing entity CPE reads the node information and the capability information from the storage device and uploads the node information and the capability information to the SMF entity.
Further, in the DPE selection process based on the CPE, the CPE informs the SMF that the SMF supports local distribution of F-TEID resources through corresponding information elements in an association setting request message or an association setting response message; the CPE calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing; and the DPE entity corresponding to the first priority of the DPE priority set is a target DPE serving as an attachment point for session establishment, and the CPE reports the node information of the target DPE to the SMF.
When SMF sends a session establishment message of a designated DPE to CPE, the CPE decodes the session establishment message to obtain the node position information of the DPE, and then sends the message to the DPE for processing by a user-defined Remote Procedure Call (RPC) mode. Conversely, the DPE-responsive session setup message is also sent back to the CPE via RPC and reported by the CPE to the SMF.
In a fifth aspect, a DPE entity is provided, where the DPE entity is responsible for main service processing and data forwarding, and has an independent N3/N6/N9 interface, and each DPE synchronously registers node and capability related information into a storage device when being powered on, where the information includes IP, port, maximum number of sessions supported, and DNN supported. The DPE processes the message from the SMF through the CPE, and then the DPE sends the response session establishment message back to the CPE through the RPC and reports the message to the SMF through the CPE.
The UPF is separated into the CPE and the DPE, the CPE plays two roles of main signaling processing and forwarding, DPE cluster coordination and the like, one role is interaction with the SMF, and the other role is overall management of the DPE set. The DPE set is used as a main entity for processing and forwarding the service data, and flexible expansion and contraction are realized by expanding and deploying a plurality of DPE sets according to needs, so that the purpose of UPF data plane expansion is achieved.
Specifically, the problem that the throughput rate required by a specific application scenario cannot be met in a high-concurrency complex service mode due to the limitation of hardware and system conditions when the UPF is deployed on a single server is solved by realizing distributed deployment of the UPF in a CPE and DPE set; by supporting DPE sets with different capabilities, UPF can process different types of user data or services in a more detailed granularity, and meanwhile, the availability of the system is enhanced; and the UPF is separated into a CPE and a DPE set, so that the modular deployment is realized, the system can be more flexibly expanded according to the requirement, and the expandability and the throughput rate of the system are improved.
Drawings
FIG. 1 is a network topology diagram of a UPF expansion system and SMF of the present invention;
FIG. 2 is a UPF network topology of the present invention;
fig. 3 is a communication flow chart of reporting DPE cluster node information and capability information by CPE according to the present invention;
FIG. 4 is a flow chart of SMF decision-based DPE selection according to the present invention;
FIG. 5 is a flow chart of session establishment between an SMF and a CPE according to the present invention;
fig. 6 is a flow chart of DPE selection based on CPE decision in accordance with the present invention.
Fig. 7 is a flow chart of downlink data routing according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 shows a network topology diagram of a UPF extension system and SMF of the present invention, and fig. 2 shows a network topology diagram of a UPF of the present invention, which internally separates a UPF into a Control Processing Entity (CPE) and a Data Processing Entity (DPE) on a UPF design level. The CPE is internally used as a global manager of the DPE and is responsible for reporting the information related to the DPE node and the capability, and simultaneously forwards the information of the session level to the DPE for processing; the external N4 interface is responsible for the interaction of signaling messages with the network element of Session Management Function (SMF). Generally, in the scheme of the present invention, the data plane DPE implementation modes, including the raw socket, the DPDK, the FPGA, and the special ASIC, may adopt different DPE deployment forms according to the actual needs of the user.
The DPE is responsible for processing session related messages sent by the CPE and processing and forwarding different types of data on the N3/N6/N9 interface. In UPF, a CPE controls one or more DPEs (hereinafter referred to as DPE sets), which may support different service types or have different capabilities. The CPE and the DPE are distributed and deployed and can respectively run on a plurality of physical devices.
Specifically, the CPE selects a target data processing entity DPE as an attachment point for session establishment in two ways:
the first method comprises the following steps: based on SMF DPE selection, fig. 4 presents a flow chart, specifically comprising the following steps:
step 101: and the SMF searches the UPF data processing entity table to obtain the node and capability related information of all the DPEs.
Specifically, as shown in fig. 3, when the SMF receives an association establishment response message carrying the DPE set node and capability related information, a UPF data processing entity table UPFi _ DPE _ TBL (i ═ 1,2,3, …, n) is established locally on the SMF to record the node and capability related information of the DPE set, where i indicates that the SMF may establish the table to record the information as with a plurality of UPFs provided in the present invention.
The design of the UPFi _ DPE _ TBL table for recording the DPE cluster node and capability related information is shown in the following table 1:
Figure BDA0002427922910000071
TABLE 1 UPFi _ DPE _ TBL Table
The three fields of N3IP/N6IP/N9IP are responsible for recording the IP address of N3/N6/N9 of each DPE; the Version field indicates the Version of IP used on the DPE; the Status field is responsible for recording the operation state of the DPE, 0 represents abnormal, and 1 represents normal operation; two fields of TEIDRI and TEIDRange record the TEID range reported by DPE, which is used for SMF to divide TEID resources corresponding to each DPE; the MaxSession field stores the maximum number of supported sessions reported by the DPE, the CurSession field records the number of sessions currently established on the DPE, when the SMF confirms that the user session of the DPE is established successfully each time, the CurSession adds one, and when the session is deleted reversely, the CurSession reduces one; the DNN field records the APN that can be supported on the DPE, the ipittr field identifies whether the DPE supports processing static or dynamic user IP, 0 indicates that static user IP is supported, and 1 indicates that dynamic user IP is processed.
Specifically, for step 101, further comprising,
step 1011: n3IP classifying different IP versions are respectively represented as N3IP SET UPFi _ IP4_ N3_ SET classified by IPv4 version, N3IP SET UPFi _ IP6_ N3_ SET classified by IPv6 version, and each classified N3IP is represented as c4_ N3IP of IPv4 address or c6_ N3IP of IPv6 address, as follows:
UPFi_IP4_N3_SET＝{c4_N3IP1,c4_N3IP2,c4_N3IP3,…,c4_N3IPn}
UPFi_IP6_N3_SET＝{c6_N3IP1,c6_N3IP2,c6_N3IP3,…,c6_N3IPn}
step 1012: the SMF entity counts the total number of DPEs according to the UPFi _ DPE _ TBL of the UPF data processing entity table, and the record is SumdpeC4_ N3IP or c6_ N3IP and DPE of the corresponding IP versionjThe mapping relationship is established as a SET UPFi _ IP4_ N3_ TO _ DPE _ SET or UPFi _ IP6_ N3_ TO _ DPE _ SET of N3IP mapping DPEs,
UPFi_IP4_N3_TO_DPE_SET＝{<c4_N3IP1,DPE1>,<c4_N3IP2,DPE2>,…,<c4_N3IPnDPEn>}
UPFi_IP6_N3_TO_DPE_SET＝{<c6_N3IP1,DPE1>,<c6_N3IP2,DPE2>,…,<c6_N3IPn,DPEn>}
step 1013: if the SMF knows that the user uses the dynamic IP from the UDM, the SMF performs local allocation, establishes a mapping relation TO divide the dynamic user IP resources, which are marked as UEIP, on the basis of the SET UPFi _ IP4_ N3_ SET and UPFi _ IP6_ N3_ SET of the N3IP classified according TO IP versions, and each c4_ N3IP or c6_ N3IP corresponds TO a type of UEIP, which is expressed as a mapping UEIP SET UPFi _ IP4_ N3_ TO _ UEIP _ SET or UPFi _ IP6_ N3_ TO _ UEIP _ SET of N3IP, and is as follows:
UPFi_IP4_N3_TO_UEIP_SET＝{<c4_N3IP1,UEIP1>,<c4_N3IP2,UEIP2>,…,<c4_N3IPn,UEIPn>}
UPFi_IP6_N3_TO_UEIP_SET＝{<c6_N3IP1,UEIP1>,<c6_N3IP2,UEIP2>,…,<c6_N3IPn,UEIPn>}
step 1014: for the selected DPE, the SMF needs TO support dividing TEIDs, according TO TEIDRI and teidrrange supported by each DPE in the UPF data processing entity table UPFi _ DPE _ TBL, on the basis of the SET UPFi _ IP4_ N3_ SET and UPFi _ IP6_ N3_ SET of N3IP classified by IP version, a mapping relation is established TO divide TEID resource pool, which is denoted as TEID, each c4_ N3IP or c6_ N3IP corresponds TO a TEID SET, which is denoted as N3IP mapping TEID SET UPFi _ IP4_ N3_ TO _ TEID _ SET or UPFi _ IP6_ N3_ TO _ TEID _ SET, as shown below:
UPFi_IP4_N3_TO_TEID_SET＝{<c4_N3IP1,TEID1>,<c4_N3IP2,TEID2>,…,<c4_N3IPn,TEIDn>}
UPFi_IP6_N3_TO_TEID_SET＝{<c6_N3IP1,TEID1>,<c6_N3IP2,TEID2>,…,<c6_N3IPn,TEIDn>}
specifically, the N3IP mapping UEIP set and the N3IP mapping TEID set in step 101 are both established and maintained at the SMF entity.
Step 102: searching a UPF data processing entity table, and when the Status field of the DPE is not 0, calculating the current load DPE of the SMF according to the MaxSession and CurSession values of the DPE by the SMFloadRecording in the DPE load set, and sequencing the set to obtain the DPE priority set.
In particular, a single DPEloadCalculating the MaxSession and CurSession values in the UPFi _ DPE _ TBL table of the UPF data processing entity table to obtain: DPEload＝CurSession/MaxSession
For maximum SumdpeA DPEloadDenoted as the SET of DPE LOAD states UPFi _ N3_ LOAD _ SET, SumdpeIs the total number of DPEs, DPEsloadTo store the DPE of load status information, the following is shown:
UPFi_N3_LOAD_SET＝{DPEload1,DPEload2,…,DPEloadn}
the LOAD SET UPFi _ N3_ LOAD _ SET of the DPE is sorted according to LOAD size to obtain a PRIORITY SET UPFi _ N3_ PRIORITY _ SET of the DPE, wherein PRIORITY and N3IP of the DPE determine a mapping relationship, which is denoted as < PRIORITY, N3IP >, as shown below:
UPFi_N3_PRIORITY_SET＝{<Priority1,N3IP1>,<Priority2,N3IP2>,…,<Priorityn,N3IPn>}
step 103: obtaining a corresponding DPE according to a first priority of a DPE priority set, comparing whether the DPE has the capability support or not by the SMF according to the attribute of the user IP in the session establishment and the APN accessed, if so, ending the selection, otherwise, obtaining the corresponding DPE according to a second priority and continuing the step until obtaining a target DPE: DPEts。
Specifically, assume Priority1 has the highest Priority, denoted as the first Priority, when Priority1 and N3IP are passed1Obtaining the mapping relation of N3IP1Then N3IP1And the searching N3IP maps the DPE SET UPFi _ IP4_ N3_ TO _ DPE _ SET or UPFi _ IP6_ N3_ TO _ DPE _ SET TO obtain the corresponding DPE. After obtaining the DPE, the SMF still needs to search an UPFi _ DPE _ TBL comparison IPAttr field of the DPE according to the user IP attribute in the session, such as static configuration or dynamic allocation, if the UPF data processing entity table UPFi _ DPE _ TBL is matched with the IPAttr field of the DPE, the comparison of the APN of the next attribute parameter is carried out, and if the APN accessed by the user in the session is matched with the APN stored in the DNN field of the DPE, the appropriate DPE in the session is formally obtainedts. Otherwise, comparing the DPE of the next priority, and so on until obtaining the DPEts。
Acquisition of DPE by SMF entitytsAnd then, informing the CPE about the information of the target DPE, and sending a session establishment request message to the CPE. Before sending down, SMF will be according to DPEtsMapping a TEID set at N3IP to search a corresponding TEID resource, if the user IP sent by the session is dynamically allocated, mapping a UEIP set at N3IP to search a corresponding UEIP resource, constructing a corresponding cell to send a session establishment message to CPE, selecting a DPE corresponding to the TEID resource as an attachment point for establishing the session, and making the DPE know the IP used by the user terminal, and then carrying out a session establishment process between the SMF and the CPE as shown in FIG. 5.
Specifically, in step 101, the SMF receives the information about the node and capability of the DPE set from the CPE, and the CPE initially obtains the information about the node and capability synchronously registered in the DPE set during power-on from a storage device during power-on, and processes the information and records the information in the local. When the receiving of the association setting request message initiated by the SMF is confirmed, the CPE will respond to the association setting response message to the SMF, where the response message carries one or more User Plane IP Resource Information elements (User Plane IP Resource Information IE, whose IE description is TS 29244-g 208.2.82) and a User Plane Data element (UP Data Unit IE), so as to report the Information related to the locally sorted DPE cluster nodes and capabilities, such as the IP of each DPE, the TEID range used, the maximum number of sessions supported, the DNN (Data Network Name, hereinafter abbreviated as DNN) and the supporting of processing static or dynamic User IP.
The user plane Data Unit cell (UP Data Unit IE) is a Packet Forwarding Control Protocol (PFCP) Protocol cell extended by the present invention, and is used for extending the capability information of the interactive DPE set between the SMF and the CPE, as shown in table 2 below:
Figure BDA0002427922910000111
TABLE 2 user plane data unit cell design
Status: position 1 indicates that the DPE state is normal; a set 0 indicates an exception.
SC: this position 1, Max Sessions field will exist, indicating the maximum number of Sessions supported by DPE; setting 0 indicates that the Max Sessions field does not exist.
V4: position 1 indicates that the IPv4 address field exists; set 0 is not present.
V6: position 1 indicates that the IPv6 address field exists; set 0 is not present.
S/A: the bit identifier DPE supports static or dynamic user IP processing, and setting 0 indicates that the static user IP processing is supported; setting 1 is to support dynamic user IP processing.
Spare: idle, can be set to 0 by the sender and ignored by the receiver.
V4 and V6 cannot be set to 1 at the same time, but one is set to 1 between the two.
Optionally, as an embodiment of the present application, the storage device provided in the present invention supports storing relevant information registered when the DPE set is powered on, and also provides a heartbeat mechanism, so as to maintain a heartbeat relationship with each registered DPE. When a DPE does not respond to the heartbeat response in time for more than a set number of times, the storage device changes the state of the DPE to be abnormal and informs the CPE that the DPE state changes. When the CPE receives the notification, the CPE locally updates the state information of the DPE and encodes the user plane data unit cell, and sends a Status position 0 and then sends an association update message to notify the SMF.
And the second method comprises the following steps: CPE-based DPE selection
The method comprises the steps that CPE acquires and locks a target DPE, and comprises the following steps: the CPF calculates the load of the DPE currently in a normal state, and the DPE is sequenced to obtain a DPE priority set; and the DPE entity corresponding to the first priority of the DPE priority set is a target DPE serving as an attachment point for session establishment.
In this decision manner, the CPE is required to inform the SMF of its support for locally allocating F-TEID resources through a corresponding information element in an association setup request message or an association setup response message. Each time of user session establishment, the SMF initiates two PFCP session establishment processes to the CPE, the first session establishment process is that the SMF acquires the node information which is reported by the CPE and is decided by the CPE locally and used as the DPE attached in the second user session establishment process, the SMF goes to the PCF to acquire the user subscription and strategy related information in the second session establishment process, the strategy and the DPE node information reported by the CPE in the first session establishment are carried in the establishment request message, and the user session is correctly established on the target DPE after the CPE receives and confirms the message.
DPE selection flow based on CPE decision as shown in fig. 6, the CPE is required to inform the SMF that it supports local allocation of F-TEID resources through a corresponding information element in an association setup request message or an association setup response message. Each time a user session is established, the SMF initiates two PFCP session establishment procedures to the CPE.
The first session establishment process is that the SMF acquires node information which is reported by the CPE through related cells in the session establishment response message and is locally decided by the CPE and used as the DPE attached in the second user session establishment process.
In the second session establishment process, the SMF goes to PCF to acquire the information related to the user subscription and policy, carries these policies and the DPE node information reported by CPE in the first session establishment in the second session establishment request message, and establishes the user session correctly in DPEts after CPE receives and confirms this message.
The algorithm and process of the DPE attached to the CPE in the local decision process of each user session establishment process are substantially the same as the SMF, but only selection is performed based on the load information of the DPE, and details are not repeated.
The network devices SMF, CPE and DPE related to the present application and the network system related to the above method are described below with reference to the above flow method, and the specific method flow is not described again.
Optionally, an SMF entity is provided, where the SMF entity obtains the target DPE, and includes the SMF entity receiving node information and capability information of the DPE reported by a control processing entity CPE; the SMF entity calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing; and the SMF entity compares whether the DPE has the capability support according to the user IP attribute and the accessed APN in the session establishment, if so, the DPE corresponding to the first priority of the DPE priority set is the target DPE, and if not, the SMF entity judges according to the DPE corresponding to the second priority until the target DPE is obtained.
After the SMF entity acquires the target DPE, the SMF entity informs the CPE of relevant information about the target DPE, the SMF entity searches TEID resources and UEIP resources corresponding to the target DPE, and sends the TEID resources and the UEIP resources to the CPE through a session establishment request message; and the control processing entity CPE locks a target data processing entity DPE as an attachment point for session establishment through the TEID resource.
Optionally, a CPE entity is further provided, where the CPE entity is responsible for performing signaling message interaction with a session management function SMF and managing a DPE through a storage device, and the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment, and may make a decision according to a DPE cluster node and capability related information locally by the CPE to select a suitable DPE, and report the DPE to the SMF for use as the attachment point for session establishment of this time, or after the SMF entity acquires the target DPE, notify the CPE of related information about the target DPE, and the CPE locks the target data processing entity DPE as the attachment point for session establishment through a TEID resource. And the node information and the capability information of the DPE are registered in the storage device, and the CPE reads the node information and the capability information from the storage device and uploads the node information and the capability information to the SMF entity.
Further, in the DPE selection process based on the CPE, the CPE informs the SMF that the SMF supports local distribution of F-TEID resources through corresponding information elements in an association setting request message or an association setting response message; the CPE calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing; and the DPE entity corresponding to the first priority of the DPE priority set is a target DPE serving as an attachment point for session establishment, and the CPE reports the node information of the target DPE to the SMF.
When SMF sends a session establishment message of a designated DPE to CPE, the CPE decodes the session establishment message to obtain the node position information of the DPE, and then sends the message to the DPE for processing by a user-defined Remote Procedure Call (RPC) mode. Conversely, the DPE-responsive session setup message is also sent back to the CPE via RPC and reported by the CPE to the SMF.
Further, the CPE will log locally for each successful session establishment. DPEtsAfter the user session information is successfully established, a session establishment response message is sent to the CPE, and the CPE passes through the DPE in the messagetsThe allocated SESSION ID records which DPE the SESSION belongs to on the SESSION data plane processing entity SESSION _ DPE _ TBL table, as shown in table 3 below.
Figure BDA0002427922910000141
TABLE 3 SESSION _ DPE _ TBL TABLE
Optionally, a DPE entity is provided, where the DPE entity is responsible for main service processing and data forwarding, and has an independent N3/N6/N9 interface, and each DPE, when being powered on, synchronously registers the node and the capability related information into the storage device, where the information includes an IP, a port, a maximum number of supported sessions, a supported DNN, and the like.
The DPE processes the message from the SMF through the CPE, and then the DPE sends the response session establishment message back to the CPE through the RPC and reports the message to the SMF through the CPE.
Optionally, a UPF data plane extension system is provided, including: the system comprises a control processing entity CPE and at least one data processing entity DPE, and further comprises a storage device and a routing device; the control processing entity CPE and the data processing entity DPE adopt a user-defined Remote Procedure Call (RPC) mode to transmit messages; the data processing entity DPE is provided with an independent N3/N6/N9 interface and is used for processing messages from the CPE; the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment and carries out signaling interaction with the SMF entity; the storage device stores node information and capability information of the data processing entity DPE, and the node information and the capability information are read to the control processing entity CPE; and the routing device establishes a mapping relation between the IP address of the user terminal distributed in the CPE synchronous session establishing process and the IP address of the N6 interface of the target DPE attached to the session, and decides to select the DPE for subsequently processing the downlink data according to the existing mapping relation.
The CPE and the DPE set interact the conversation related information in a self-defined RPC mode, the realization of the mode adopts the combination of UDP communication and data serialization, the CPE side decodes the conversation related information and stores the conversation related information in a general conversation data structure, when sending the conversation information of different types, only different parts of data need to be stored on the specific data structure of the conversation, such as the conversation establishing information, and the general conversation data structure and the conversation establishing data structure are adopted. And then constructing a session message data structure to be sent, constructing a general message structure head and adding a serial number identifier, then carrying out data serialization, transmitting to a corresponding DPE (distributed processing element) or DPE through UDP (user datagram protocol), and sending to CPE (customer premises equipment).
Optionally, a routing device is further provided to implement routing of the downstream data, so as to implement N6 interface selection of the DPE, and the CPE and the routing device update network link information of the DPE to the CPE synchronously by establishing a neighbor relationship. When the user session is successfully established each time, the CPE enables the IP address of the user terminal allocated in the session to be bound with N6IP of the DPE attached to the session to establish a mapping relation < UEIP, N6IP > of a routing entry, and sends the mapping relation to the routing device in time to update the network link information of the DPE. After receiving the information, the routing device processes and records the information on the local routing table. In addition, if the IP address of the ue in the session changes, the CPE will notify the routing device in time, and the routing is performed as shown in fig. 7.
When the routing device receives the data sent by the DN, it first checks whether the destination address of the data can be obtained from the local routing table to obtain the corresponding N6 IP. When the destination address is confirmed to be the IP address of the user terminal used in a session in the DPE set, the data can be routed to the specified DPE for processing through the found N6 IP.
Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The methods or steps described in connection with the embodiments disclosed herein may be embodied in hardware, a software program executed by a processor, or a combination of both. The software routines may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or alterations to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications or alterations are intended to be within the scope of the present invention.

Claims (9)

1. A method for UPF data plane expansion is characterized in that:
dividing the UPF into a control processing entity CPE and at least one data processing entity DPE;
the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment; the control processing entity CPE receives the message of the SMF entity at an N4 interface and forwards the message to a target data processing entity DPE;
the target data processing entity DPE processes the session message from the CPE and reports the response message to the SMF entity through the CPE;
and interacting session related messages between the CPE and the DPE in a user-defined RPC mode.
2. The method of UPF data plane expansion according to claim 1,
the control processing entity CPE selects a target data processing entity DPE,
the method comprises the following steps of obtaining a target DPE by the SMF, wherein the steps comprise:
the SMF entity receives the node information and the capability information of the DPE reported by the CPE;
the SMF entity calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing;
and the SMF entity compares whether the DPE has the capability support according to the user IP attribute and the accessed APN in the session establishment, if so, the DPE corresponding to the first priority of the DPE priority set is the target DPE, and if not, the SMF entity judges according to the DPE corresponding to the second priority until the target DPE is obtained.
3. The method of UPF data plane expansion according to claim 2,
the control processing entity CPE selects a target data processing entity DPE, and the method further comprises the following steps:
the SMF entity searches for a TEID resource corresponding to the target DPE;
sending the TEID resource to a control processing entity CPE through a session establishment request message;
and the control processing entity CPE locks a target data processing entity DPE as an attachment point for session establishment through the TEID resource.
4. The method of UPF data plane expansion according to claim 1,
the control processing entity CPE selects a target data processing entity DPE,
also included is a CPE acquire and lock target DPE, including:
the CPE informs the SMF that the SMF supports the local distribution of F-TEID resources through corresponding information elements in the association setting request message or the association setting response message;
the CPE calculates the load of the DPE currently in a normal state, and the DPE priority set is obtained by sequencing;
a DPE entity corresponding to a first priority of the DPE priority set is a target DPE serving as an attachment point for session establishment;
and the CPE reports the node information of the target DPE to the SMF.
5. The method of UPF data plane expansion according to claim 1, further comprising:
the node information and the capability information of the data processing entity DPE are registered in a storage device;
and the control processing entity CPE reads the node information and the capability information from the storage device and uploads the node information and the capability information to the SMF entity.
6. The method of UPF data plane extension of claim 1, further comprising updating a state of a DPE, comprising:
the CPE receives the DPE state abnormal information reported by the storage device, the CPE locally updates the DPE state information and encodes a user plane data unit cell, and sends an associated update message to inform the SMF to indicate that the DPE state is abnormal.
7. The method for UPF data plane expansion according to claim 1, further comprising selection of a downstream data route, comprising:
when the user session is successfully established, the CPE establishes a mapping relation between the IP address of the user terminal distributed in the session establishing process and the IP of the N6 interface of the target DPE attached to the session;
the CPE synchronizes the mapping relation to a routing device;
and the routing device decides to select the DPE for processing the downlink data according to the mapping relation.
8. The method of UPF data plane expansion according to claim 1,
and carrying user plane data unit cells between the SMF and the CPE through an extended PFCP protocol.
9. A UPF data plane expansion system, comprising:
the system comprises a control processing entity CPE and at least one data processing entity DPE, and further comprises a storage device and a routing device; the control processing entity CPE and the data processing entity DPE adopt a user-defined Remote Procedure Call (RPC) mode to transmit messages;
the control processing entity CPE selects a target data processing entity DPE as an attachment point for session establishment and carries out signaling interaction with the SMF entity;
the data processing entity DPE is provided with an independent N3/N6/N9 interface, processes the message from the CPE and reports the response message to the SMF entity through the CPE;
the storage device stores node information and capability information of the data processing entity DPE, and the node information and the capability information are read to the control processing entity CPE;
and the routing device decides to select the DPE for subsequently processing the downlink data according to the mapping relation between the IP address of the user terminal distributed in the establishing process of the CPE synchronous session and the IP address of the N6 interface of the target DPE attached to the session.
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