Ensuring NR UE Access When Configured Cell Bandwidth is Not Supported

5G NR
, , ,
1

Hi Experts,

If an NR UE does not support the configured NR cell bandwidth, which parameter needs to be adjusted to ensure the user can still access the cell?

Vendors: Huawei & Ericsson.

Ensuring NR UE Access When Configured Cell Bandwidth is Not Supported
Ensuring NR UE Access When Configured Cell Bandwidth is Not Supported1024×1024 156 KB

2

Huawei and Nokia have a feature that allows configuring multiple BWPs, whereas Ericsson has the feature but does not support different bandwidths.

3

Here’s an example:

I’m not sure if I fully understood your question, but in Huawei, when users are REDCAP, we need to configure NRDUCELLBWP as follows:

Command:

MOD NRDUCELLBWP:BWPCONFIGSWITCH=UE_BW_ADAPTIVE_SW-1,ULMINCARRIERBW=20M,DLMINCARRIERBW=20M;

This configuration ensures that REDCAP UEs can access the network.

Parameter Descriptions:

  • UE_BW_ADAPTIVE_SW: Enables UE bandwidth adaptation. When enabled, the gNodeB verifies whether UEs support the configured cell bandwidth. If not, it adjusts the UE bandwidth based on the UlMinCarrierBw and DlMinCarrierBw values, the existing BWPs in the cell, and UE capabilities. If disabled, the gNodeB assigns bandwidth based on the full cell bandwidth by default. This is applicable only to low-frequency cells.
  • UlMinCarrierBw: Defines the minimum uplink carrier bandwidth supported by the cell.
  • DlMinCarrierBw: Defines the minimum downlink carrier bandwidth supported by the cell.

This might be similar to what you need to configure in your case.

4

Yes, we have a cell with 80 MHz bandwidth, but the UE does not support the full 80 MHz.

There are multiple re-establishments due to reconfiguration failures, leading to ENDC failures.

What measures can be taken to prevent this issue?

5

Do you have the device model mapping available?