Method and Interface for Information Interaction in O-RAN
There is provided a method of operating an Open Radio Access Network (O-RAN) 5G Functional Application Platform Interface (FAPI) between an O-RAN distributed unit (O-DU) PHY (Layer-1 entity, L1), i.e., O-DU L1, and an O-DU MAC (Layer-2 entity, L2), i.e., O-DU L2. The method includes (a) sending, from the O-DU L2 to the O-DU L1, a message informing the O-DU L1 to perform a User Equipment (UE) correlation calculation, and on which Sounding Reference Signal (SRS) resources the correlation calculation needs to be conducted, (b) sending, from the O-DU L1 to the O-DU L2, a message containing correlation information of UEs served in a cell, and (c) sending, from the O-DU L1 to the O-DU L2, a message containing information of the SRS power, noise and interference of each UE served in the cell.
1 . A method of operating an Open Radio Access Network (O-RAN) 5G Functional Application Platform Interface (FAPI) between an O-RAN distributed unit (O-DU) PHY Layer-1 entity, L1 (O-DU L1) and an O-DU MAC Layer-2 entity, L2 (O-DU L2), comprising:
sending, from said O-DU L2 to said O-DU L1, a message informing said O-DU L1 to perform a User Equipment (UE) correlation calculation, and on which Sounding Reference Signal (SRS) resources said correlation calculation needs to be conducted;
sending, from said O-DU L1 to said O-DU L2, a message containing correlation information of UEs served in a cell; and
sending, from said O-DU L1 to said O-DU L2, a message containing information of said SRS power, noise and interference of each UE served in said cell.
2 . The method of claim 1 , further comprising:
sending, from said O-DU L1 to said O-DU L2, via a 5G FAPI, a message that includes an outcome of said correlation calculation.
3 . The method of claim 2 , further comprising:
determining, by said O-DU L2, which UEs are suitable for multiple user multiple input multiple output (MU-MIMO) and which UEs are for single user multiple input multiple output (SU-MIMO); and
selecting, by said O-DU L2, UEs to form MU groups.
4 . The method of claim 1 , further comprising:
calculating, by said O-DU L1, SRS power, noise and interference based on SRS raw data of each UE received from said O-RU, thus yielding an SRS power, noise and interference calculation; and
sending, from said O-DU L1 to said O-DU L2, via a 5G FAPI, an SRS.indication message that includes said SRS power, noise and interference calculation.
5 . The method of claim 4 , further comprising:
performing, by said O-DU L2, unified power control on said SRS and a Physical Uplink Shared Channel (PUSCH), based on said SRS power, noise and interference calculation and a signal-to-noise ratio (SNR) contained in said SRS.indication message.
6 . A method of operating an Open Radio Access Network (O-RAN) 5G Functional Application Platform Interface (FAPI) between an O-DU L1 and an O-DU L2, wherein said O-DU L1 performs operations comprising:
performing a channel estimation based on Sounding Reference Signal (SRS) raw data of each served User Equipment (UE) received from an O-RAN Radio Unit (O-RU); and
calculating a correlation of said SRS resources configured corresponding to UEs in a cell based on a result of said channel estimation.
7 . The method of claim 6 , wherein said O-DU L1 sends a message to said O-DU L2 via a 5G FAPI, that includes an outcome of said correlation calculation.
8 . The method of claim 7 , wherein said O-DU L2 determines which UEs are suitable for multiple user multiple input multiple output (MU-MIMO), and which UEs are for single user multiple input multiple output (SU-MIMO), and then selects UEs to form MU groups.
9 . The method of claim 8 , wherein said O-DU L1 calculates SRS power, noise and interference based on SRS raw data of each UE received from said O-RU, and includes these results in an SRS.indication message delivered to said O-DU L2 via a 5G FAPI.