Procedure to add dedicated Bandwidth part (BWP)¶

Contributed by 5G Testbed IISc¶

Developers: Abhijith A, Shruthi S¶

Terminology¶

Bandwidth part (BWP)¶

Bandwidth Part (BWP) is a set of contiguous Resource Blocks in the resource grid.

Parameters of a BWP are communicated to UE using RRC parameters: BWP-Downlink and BWP-Uplink.

A UE can be configured with a set of 4 BWPs in uplink (UL) and downlink (DL) direction (3GPP TS 38.331 Annex B.2 Description of BWP configuration options). But only 1 BWP can be active in UL and DL direction at a given time.

Procedure to run multiple dedicated BWPs¶

A maximum of 4 dedicated BWPs can be configured for a UE.

To configure multiple BWPs, add the following parameters in the physical parameters section:

Setup of the Configuration files¶

In the configuration file you have the option to select the 1st active BWP, the RIV and SCS of each BWP in the following way (example with 3 additional BWPs):

    first_active_bwp = 1;
    bwp_list = ({ scs = 1; bwpStart = 0; bwpSize = 106;},
                { scs = 1; bwpStart = 0; bwpSize = 51;},
                { scs = 1; bwpStart = 0; bwpSize = 24;});

This example configures 3 additional BWPs, with IDs from 1 to 3. Find these parameters in this configuration file: “ci-scripts/conf_files/gnb.sa.band78.106prb.rfsim.neighbour.conf”

Testing gNB and UE in RF simulator¶

gNB command:¶

    sudo ./nr-softmodem -O ../../../ci-scripts/conf_files/gnb.sa.band78.106prb.rfsim.neighbour.conf --rfsim --rfsimulator.serveraddr server

UE command:¶

    sudo ./nr-uesoftmodem -C 3319680000 -r 106 --numerology 1 --ssb 516 --band 78  --rfsim --rfsimulator.serveraddr 127.0.0.1