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Content for  TS 38.401  Word version:  16.3.0

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7  NG-RAN functions descriptionWord‑p. 19

7.0  General

For the list of functions refer to TS 38.300.

7.1  NG-RAN sharing

NG-RAN supports radio access network sharing as specified in TS 23.501 and TS 38.300 and TS 36.300.

7.2  Remote Interference Management |R16|

The Remote Interference Management function in non-split gNB case is specified in TS 38.300.
In case of split gNB architecture, in the victim set, a gNB-DU detects the remote interference. If remote interference is detected, the gNB-DU can send out the RIM-RS. In the aggressor set, if a gNB-DU detects the RIM-RS sent by the victim gNB(s), it sends to the gNB-CU the RIM-RS detection status and the victim Set ID. The gNB-CU acts as a coordinator on behalf of its affiliated gNB-DUs, where the gNB-CU merges the outgoing RIM information received from its gNB-DUs in the aggressor set and forwards the merged information to all the gNBs in the victim set.
Similarly, in the victim set, the gNB-CU distributes the incoming RIM information to all the gNB-DUs in the set, as indicated in the RIM information received from the aggressor set.
In addition, to facilitate consolidation of RIM information, the gNB-DU provides the associated aggressor set ID and the victim set ID of each serving cell to the gNB-CU.
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7.3  Cross-Link Interference Management |R16|Word‑p. 20
The Cross-Link Interference Management function in non-split gNB case is specified in TS 38.300.
In case of split gNB architecture, the gNB-CU forwards the TDD DL/UL patterns received from neighboring nodes to each concerned gNB-DU. The gNB-DU reports the TDD DL/UL patterns of its serving cells to the gNB-CU if Cross-Link Interference is detected.

7.4  Support for Non-Public Networks |R16|

NG-RAN supports NPN as specified in TS 23.501 and TS 38.300.

7.5  RACH Optimisation Function |R16|

The RACH Optimization Function in non-split gNB case is specified in TS 38.300.
In case of split gNB architecture, RACH configuration conflict detection and resolution function is located at the gNB-DU. To perform RACH optimisation at gNB-DU, gNB-CU sends the RACH report reported by the UE to gNB-DU via F1AP signalling. The gNB-DU signals the PRACH configuration per-cell to gNB-CU. The gNB-CU may forward a limited set of neighbour cell's PRACH configurations received from neighbour gNB-CU to the gNB-DU to resolve the configuration conflict.
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7.6  Positioning |R16|

The NG-RAN supports the positioning functionality as specified in TS 38.305.

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