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

Claim 0:
1. A method implemented in an Access Point, AP, for transmitting 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 method comprising:
receiving, from the CPU, a message that the AP is selected to serve the terminal and data intended for said terminal;
independently conducting power control, exclusively considering terminals that are served by the AP itself, conducting power control comprising 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
transmitting said intended data to the terminal.