Support of load balancing for supplementary uplink in CU-DU architecture
A method and apparatus for support of load balancing for supplementary uplink (SUL) in central unit (CU)-distributed unit (DU) architecture in a new radio access technology (NR) is provided. A gNB central unit (gNB-CU) receives, from at least one gNB distributed unit (gNB-DU), information related to a load status of supplementary uplink (SUL) for the at least one gNB-DU, and determines to adjust at least one parameter related to the SUL for a gNB-DU, among the at least one gNB-DU, based on the information related to the load status of the SUL for the gNB-DU. Upon receiving information related to the at least one parameter related to the SUL from the gNB-CU, the gNB-DU may adjust the at least one parameter related to the SUL based on the information related to the at least one parameter related to the SUL.
1. A method for a gNB central unit (gNB-CU) in a wireless communication system, the method comprising:
receiving, from at least one gNB distributed unit (gNB-DU), information related to a load status of supplementary uplink (SUL) for the at least one gNB-DU;
determining to adjust at least one parameter related to the SUL for a gNB-DU, among the at least one gNB-DU, based on the information related to the load status of the SUL for the gNB-DU; and
transmitting, to the gNB-DU, information related to the at least one parameter related to the SUL for the gNB-DU,
wherein the at least one parameter related to the SUL for the gNB-DU includes q-RxLevMinSUL, which is a minimum required reception level in a cell.
2. The method of claim 1 , wherein the information related to the load status of the SUL for the at least one gNB-DU is received per cell of the at least one gNB-DU.
3. The method of claim 1 , wherein the information related to the load status of the SUL for the at least one gNB-DU includes a load percentage value of the SUL for the at least one gNB-DU.
4. The method of claim 1 , wherein the information related to the load status of the SUL for the at least one gNB-DU includes a load level of the SUL for the at least one gNB-DU.
5. The method of claim 1 , further comprising initiating a handover towards a neighbor cell of a second gNB-DU among the at least one gNB-DU.
6. The method of claim 1 , wherein the information related to the at least one parameter related to the SUL for the gNB-DU is transmitted per cell of the gNB-DU.
7. The method of claim 1 , wherein the information related to the at least one parameter related to the SUL for the gNB-DU includes an exact value of the at least one parameter to be adjusted.
8. The method of claim 1 , wherein the information related to the at least one parameter related to the SUL for the gNB-DU includes a difference between the at least one parameter to be adjusted from a pre-defined value.
9. The method of claim 1 , wherein a wireless device is configured with one downlink (DL) and two ULs including the SUL in a cell.
10. The method of claim 9 , wherein the wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device.
11. The method of claim 1 , wherein the gNB-CU is a logical node constituting a gNB that hosts a radio resource control (RRC) layer and a packet data convergence protocol (PDCP) layer.