【单选题】
A 可能是UPF的N6口地址池到公网存在丢包或者N3接口存在丢包或路由问题
Possibly, packet loss occurs from the N6 interface address pool of the UPF to the public network, packet loss occurs at the N3 interface, or routing is faulty.
B 可能是做了策略限速，可以通过N4会话建立信令，检查FER中是否带了限速策略
Policy-based rate limiting may be performed. You can check whether the FER carries the rate-limiting policy through the N4 session establishment signaling.
C 可以在UPF上检查SMF下发的userprofile匹配到的rule中，是否带了限速策略
On the UPF, you can check whether the rate-limiting policy is carried in the rule matched with userprofile delivered by the SMF.
D 可能是CHF/OCS下发的配额过小，导致频繁申请配额影响速率
Possibly, the quota delivered by the CHF/OCS is too small, causing frequent requests for the quota. Therefore, the rate is affected.
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