gNB fixed downlink allocation

Hello Experts.

There is UL configured grants that allows UE to Skip sending SR and BSR and would have a fixed allocation.

Anyone aware if there is a similar mechanism in DL where gNB allocated fixed downlink allocation?

During VOLTE (SPS).

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May i know, In what scenario fixed allocations will be used in UL ?

Is it same as Volte call scenario like SPS scheduling ? as we have to send UL RTP packets same as DL ?