Configured grants

[Supriya Kumari]

We are trying to implement the configured grant for uplink traffic in ns3. For that we need to do changes in the current ns3, nr module code, which uses dynamic scheduling.

In dynamic scheduling, UE sends scheduling requests to gNb. With PDCCH, gnb sends the DCI/C-RNTI to UE. Then UE sends PUSCH. This is done on a per slot basis.

But in the configured grant Type 2 (according to 3GPP standards), gNB sends DCI/CS-RNTI, then UE sends PUSCH for the time period mentioned in periodicity(RRC parameter). So that means, data is being sent in slots, without multiple DCIs. We need to implement this on slot level so that for a particular periodicity, gnb can allocate resources for multiple slots and can avoid sending DCI for each request.

How can we do this in the current ns3 nr module?

[Sandra Lagén]

Hi Supriya,

You are asking us about a design issue, for which there is not a trivial/quick response... :)

You can have a look at the NR V2X module; in there we implemented the Semi-Persistent Scheduling (SPS), in which the UE saves a grant and transmits periodically based on it. A similar thing should be implemented for configured grant in UL; the UE gets the grant from the DCI, and then saves this grant to know where/when to transmit, according to its periodicity and allocated RBs/symbols. The most tricky part is at the gNB-scheduler part, since you also need to save the grants there, and combine with the future dynamic scheduling. If you implement something, let us know, since this is an important feature.

BR,

Sandra

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