Downlink data stream session bandwidth limiting method, network element, equipment and medium

Abstract

The invention provides a downlink data stream session bandwidth limiting method, an intermediate user plane function network element, a session management function network element, terminal equipment and a computer readable storage medium. An intermediate user plane function network element is arranged between a session anchor point user plane function network element and a branch point user plane function network element of each protocol data unit. The method comprises the following steps that: an intermediate user plane function network element acquires a data stream which is sent by each protocol data unit session anchor point user plane function network element and exceeds the own downlink bandwidth limit of the intermediate user plane function network element; and the intermediate user plane function network element judges whether a first instruction of the session management function network element is received or not: if yes, forwarding the data stream exceeding the own downlink bandwidth limit to the branch point user plane function network element. According to the embodiment of the invention, on the basis that signaling interaction between PSA UPF and BP or UL CL UPF is not needed, packet loss of downlink flow is not generated on a classifier or a branch point, and meanwhile, limited bandwidth resources are limited by fully utilizing session bandwidth.

Description

technical field [0001] The present disclosure relates to the field of communication technologies, and in particular to a method for limiting session bandwidth of downlink data streams, an intermediate user plane functional network element, a session management functional network element, a terminal device, and a computer-readable storage medium. Background technique [0002] In the fifth-generation communication technology (5th-Generation, referred to as 5G) specification TS23.501, it is defined that a single protocol data unit (Protocol Data Unit, referred to as PDU) session has multiple protocol data unit session anchors (PDUSession Anchors, referred to as PSA) ) scene. It is pointed out that the user plane function (User Plane Function, UPF for short) that performs the function of the branching point (Branching Point, BP for short) or the uplink classifier (Uplink Classifier, UL CL for short) should be in the session management function (Session Management Function, SMF f...

AI Technical Summary

Problems solved by technology

And the downlink (that is, the data flow from the data network to the user terminal) session AMBR is limited by each UPF (PSA) that terminates the N6 interface (that is, the interface between the UPF and the DN), and does not require the communication between the UPFs. The purpose is to reduce the UPF that performs the function of the upstream classifier / branch point to discard the downstream traffic from each PSA because the downstream traffic of the PDU session exceeds the AMBR of the downstream session, because this may cause errors in the counting of downstream data packets and affect charging. accuracy

[0003] However, for the downstream traffic, due to the influence of the routing environment on the DN side, it is not always possible to ensure a one-to-one correspondence with the path of the upstream traffic, and it is impossible to ensure that the downstream traffic on each branch always matches the pre-allocated bandwidth (AMBR). Therefore, no matter how to allocate the session-AMBR among the branches, such as: average distribution, downlink distribution according to the proportion of uplink traffic, fixed value distribution, etc., there is the same problem, that is, the sum of the downlink traffic of each branch is difficult to be exactly Equal to the downstream session-AMBR value defined on the upstream classifier or branch point

Therefore, on the upstream classifier or the branch point, the packet loss of the downstream traffic may occur, or the session-AMBR value cannot be reached, thereby wasting bandwidth resources.

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