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For NSI selection, for the above proposal of coverageArea specification, OOF can check if the coverageArea is a subset of the coverageArea of an existing NSI (when sharing is allowed) en when determining feasibility of reuse. It would be better to do this check in a separate method, so that it can be easily replaced by another one, when a different approach of specifying coverageArea is adopted. This check can be taken up even beyond H-release.
2. Decomposition of RAN NF Slice Profile for each Near-RT RIC
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For Honolulu, we can start with a very simple approach of doing this decomposition based on the number of cells controlled by each Near-RT RIC for a given S-NSSAI.
Alternatively, we can do the split based on the PM data collected for each S-NSSAI at cell level, and taking capacity into consideration. For example:
- Based on PDU sessions setup successfully overall in that cell (PM data) and consider the maximum number of UEs that can be supported by the cell (pre-configured limit) (and what is already allocated) to determine maxNumberofUEs for each Near-RT RIC scope for that S-NSSAI.
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If Slice Profile has maxNumberofUEs = 120:
maxNumberofUEs for Near-RT RIC 1 = 120*(25+40)/(50+25+40), subject to constraint of supporting only a maximum of 90% of (75+100).
maxNumberofUEs for Near-RT RIC 2 = 120*(50)/(50+25+40), subject to constraint of supporting only a maximum of 90% of (90).
- Based on DL/UL PRBs used (PM data) and consider the areaTrafficCapDL/areaTrafficCapUL that can be supported by the cell/TA (and what is already allocated) to determine for each areaTrafficCapDL/areaTrafficCapUL for each Near-RT RIC scope for that S-NSSAI.
Beyond Honolulu, we can further enhance it to generate the optimal decomposition using more sophisticated mechanism, and additional inputs.
maxNumberofUEs
coverageAreaTAList
latency
uEMobilityLevel
resourceSharingLevel
The resource type of interest for an RRM Policy.
allowedValues:
PRB (for NRCellDU, GNBDUFunction)
RRC connected users (for NRCellCU, GNBCUCPFunction)
DRB (for GNBCUUPFunction)
See NOTE 2and NOTE 4
| Slice Profile Attribute that needs decomposition | Decomposed Value sent to Near-RT RIC | RRM policy value to be sent to CU/DU | Remarks |
|---|---|---|---|
| maxNumberofUEs | Based on RRC (RRM Policy) distribution across cells (NRCellCUs), maxNumberofUEs split to be determined (using activityFactor). | Total RRC (across NRCellCUs, GNBCUCPFunctions for the S-NSSAI) to be determined based on activityFactor and maxNumberofUEs. Then RRC to be distributed across the NRCellCUs in the coverageAreaTAList based on current RRC occupancy levels (i.e., % already consumed by other slice instances). |
|
| Total DRBs (across GNBCUUPFunctions) to be determined to be determined based on activityFactor and maxNumberofUEs (and average number of radio bearers per UE???). Then DRB to be distributed across the GNBCUUPFunctions in the coverageAreaTAList based on current DRB occupancy levels (i.e., % already consumed by other slice instances). |
| ||
| areaTrafficCapDL, areaTrafficCapUL | Based on expDataRateDL (currently copied from dLThptPerSlice) and expDataRateUL (currently copied from uLThptPerSlice) and the ratio of coverage area of the Near-RT RIC over the total coverage area (determined by number of cells mapped under it). | ||
| expDataRateDL, expDataRateUL | (At present, this has to be determined from the value in the Slice Profile divided by (number of UEs * activity factor. Later when this carries the data rate per UE correctly, no decomposition is required)) |
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3. Enhancements in NSI/NSSI selection
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Refer NST Selection for relevant info.
7. Slice Modification recommendations
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