Patent ID: 11916623
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. An Access Point, AP, configured to transmit data intended for a terminal in a cell-free massive Multiple-Input and Multiple-Output, MIMO, communications system, the AP being grouped into a cluster together with other APs and the cluster operates autonomously and the cluster being connected to, and managed by, one Central Processing Unit, CPU, the AP comprises:
a processing circuitry; and
a memory circuitry storing computer program code which, when run in the processing circuitry, causes the AP to:
receive, from the CPU, a message that the AP is selected to serve the terminal and data intended for said terminal;
independently conduct power control, exclusively considering terminals that are served by the AP itself, the power control being conducted by calculating a power control coefficient (η) for use with the terminal, the power control coefficient (η) is calculated by a normalized function ƒ(⋅) of at least one parameter of the communications system, the function ƒ(⋅) is normalized to ensure that a power constraint of the AP is fulfilled and the function ƒ(⋅) is a function ƒ(⋅) of variance of an estimated channel (γ) between the AP and the terminal; and
transmit said intended data to the terminal.