52 lines
1.7 KiB
Markdown
52 lines
1.7 KiB
Markdown
# Procedure to add dedicated Bandwidth part (BWP)
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## Contributed by 5G Testbed IISc
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### Developers: Abhijith A, Shruthi S
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# Terminology #
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## Bandwidth part (BWP) ##
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Bandwidth Part (BWP) is a set of contiguous Resource Blocks in the resource grid.
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Parameters of a BWP are communicated to UE using RRC parameters: BWP-Downlink and BWP-Uplink.
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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.
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# Procedure to run multiple dedicated BWPs #
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A maximum of 4 dedicated BWPs can be configured for a UE.
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To configure multiple BWPs, add the following parameters to the gNB configuration file under "servingCellConfigDedicated":
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## Setup of the Configuration files ##
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```
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firstActiveDownlinkBWP-Id = 1; #BWP-Id
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defaultDownlinkBWP-Id = 1; #BWP-Id
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firstActiveUplinkBWP-Id = 1; #BWP-Id
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```
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Each dedicated BWP must have:
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```
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# BWP 1 Configuration
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dl_bwp-Id_1 = 1;
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dl_bwp1_locationAndBandwidth = 28875; // RBstart=0, L=106 (40 MHz BW)
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# subcarrierSpacing
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# 0=kHz15, 1=kHz30, 2=kHz60, 3=kHz120
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dl_bwp1_subcarrierSpacing = 1;
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```
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Find these parameters in this configuration file: "targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf"
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# Testing gNB and UE in RF simulator
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## gNB command:
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```
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sudo ./nr-softmodem -O ../../../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf --gNBs.[0].min_rxtxtime 6 --rfsim --sa
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```
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## UE command:
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```
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sudo ./nr-uesoftmodem -r 106 --numerology 1 --band 78 -C 3619200000 --rfsim --sa --uicc0.imsi 208990000000001 --rfsimulator.serveraddr 127.0.0.1
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```
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