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

Claim 14:
15. A Central Processing Unit, CPU, configured to transmit data intended for a terminal in a cell-free massive Multiple-Input and Multiple-Output, MIMO, communications system, the CPU being connected to, and managing, a cluster of Access Points, APs, and the cluster operates autonomously, the CPU comprising:
a processing circuitry; and
a memory circuitry storing computer program code which, when run in the processing circuitry, causes the CPU to:
independently conduct power control, exclusively considering terminals that are served by each AP, each AP being caused to conduct power control 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 each AP is fulfilled, and the function ƒ(⋅) is a function ƒ(⋅) of variance of an estimated channel (γ) between each AP and the terminal; and
transmit, to all APs in the cluster, a message that the receiving APs are selected to serve the terminal and said data intended for the terminal.