Distributed coordinated downlink precoding for multi-cell MIMO wireless network virtualization

Patent metadata

Field	Value
Publication number	US-12531597-B2
Application number	US-202117928024-A
Country	US
Kind code	B2
Filing date	May 28, 2021
Priority date	May 29, 2020
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A method and network node for distributed coordinated downlink precoding for multi-cell multiple input multiple output (MIMO) wireless network virtualization are disclosed. According to one aspect, a network node is configured to, in each of a plurality of successive transmission time periods: transmit to each of a plurality of SPs a corresponding set of channel information; receive from each of the plurality of SPs a service demand and a normalized precoding matrix, the normalized precoding matrix being determined by the corresponding SP based on the corresponding set of channel information; allocate a virtual transmit power to each of the plurality of SPs based at least in part on the received service demands and normalized precoding matrices; and determine a downlink precoding matrix to transmit messages to WDs, the downlink precoder matrix being based at least in part on the received service demands and normalized precoding matrices.

First claim

What is claimed is:

1 . A network node configured to communicate with a plurality of service providers (SPs) and wireless devices, the network node comprising:
a radio interface configured to:
in each of a plurality of successive transmission time periods:
transmit to each of a plurality of SPs m a corresponding set of channel information, H m ; and
receive from each of the plurality of SPs a service demand and a normalized precoding matrix, W m , the normalized precoding matrix W m being determined by the corresponding SP based at least in part on the corresponding set of channel information H m ; and

processing circuitry in communication with the network node, the processing circuitry configured to:
allocate a virtual transmit power α m p w to each of the plurality of SPs based at least in part on the received service demands and normalized precoding matrices, W m ; and
determine a downlink precoding matrix, V, to transmit messages to WDs, the downlink precoder matrix V being based at least in part on the received service demands and normalized precoding matrices, W m .

2 . The network node of claim 1 , wherein the virtual transmit power allocations are determined that provide a specified balance between interference suppression/virtualization demand attainment and achieving a specified performance.

3 . The network node of claim 2 , wherein, providing the specified balance is based at least in part on allocation of a virtual transmit power α c m P c w to SP min cell c, where P c w ≤P c max is the virtual transmit power allocated to cell c, and α c m is a virtual transmit power allocation factor such that =1, and P c max a maximum transmit power limit on the BS in cell c.

4 . The network node of claim 1 , wherein the processing circuitry is further configured to coordinate C cells at a beamforming level to determine the downlink precoding matrix V to meet a virtualization demand D based at least in part on the received service demands from the SPs.

5 . The network node of claim 1 , wherein the determination of a downlink precoding matrix, V is based at least in part on a leakage function and a precoding deviation function.

6 . The network node of claim 5 , wherein the downlink precoding matrix, V is based at least in part on minimization of a weighted sum of leakage and precoding deviation subject to per-cell maximum transmit power constraints.

7 . The network node of claim 1 , wherein the downlink precoding matrix, V is based at least in part on minimization of a leakage subject to per cell precoding deviation and maximum transmit power constraints.

8 . The network node of claim 1 , wherein the downlink precoding matrix V is based at least in part on minimization of a precoding deviation subject to per-cell leakage and maximum transmit power constraints.

9 . The network node of claim 1 , wherein the processing circuitry is further configured to base the allocation of virtual transmit power α m P w on the received normalized precoding matrices, W m , without exchange of channel state information (CSI) or transmit coordination across cells served by the network node.

10 . A method implemented in a network node in communication with a plurality of service providers (SPs) and wireless devices, the method comprising:
in each of a plurality of successive transmission time periods:
transmitting to each of a plurality of SPs m a corresponding set of channel information, H m ;
receiving from each of the plurality of SPs a service demand and a normalized precoding matrix, W m , the normalized precoding matrix W m being determined by the corresponding SP based at least in part on the corresponding set of channel information H m ;
allocating a virtual transmit power α m P w to each of the plurality of SPs based at least in part on the received service demands and normalized precoding matrices, W m ; and
determining a downlink precoding matrix, V, to transmit messages to WDs, the precoder matrix V being based at least in part on the received service demands and normalized precoding matrices, W m .

11 . The method of claim 10 , wherein the allocating of virtual transmit powers is based at least in part on attaining a specified balance between interference suppression/virtualization demand and achieving a specified performance.

12 . The method of claim 11 , wherein providing the specified balance is based at least in part on allocating a virtual transmit power α c m P c w to SP m in cell c, where P c W ≤P c max is the virtual transmit power allocated to cell c, and α c m is a virtual transmit power allocation factor such that α c m =1, and P c max a maximum transmit power limit on the BS in cell c.

13 . The method of claim 10 , further comprising coordinating C cells at a beamforming level to determine the downlink precoding matrix V to meet a virtualization demand D based at least in part on the received service demands from the SPs.

14 . The method of claim 10 , wherein the determination of a downlink precoding matrix, V is based at least in part on a leakage function and a precoding deviation function.

15 . The method of claim 10 , wherein the downlink precoding matrix, V is based at least in part on minimization of a weighted sum of leakage and precoding deviation subject to per-cell maximum transmit power constraints.

16 . The method of claim 10 , wherein the downlink precoding matrix, V is based at least in part on minimization of a leakage subject to per cell precoding deviation and maximum transmit power constraints.

17 . The method of claim 10 , wherein the downlink precoding matrix V is based at least in part on minimization of a precoding deviation subject to per-cell leakage and maximum transmit power constraints.

18 . The method of claim 10 , further comprising basing the allocation of virtual transmit power α m P w on the received normalized precoding matrices, W m , without exchange of channel state information (CSI) or transmit coordination across cells served by the network node.

19 . A network node, the network node comprising:
a radio interface configured to:
receive channel information, H m , from an infrastructure provider, InP;
transmit a service demand and a normalized precoding matrix, W m , to the InP; and
receive a downlink precoding matrix, V, from the InP to transmit messages to WDs, the downlink precoder matrix V being based at least in part on service demands and normalized precoding matrices, W, of a plurality of service providers; and
processing circuitry in communication with the radio interface, the processing circuitry configured to:
determine the normalized precoding matrix, W m , based at least in part on the received channel information H m ; and
apply the downlink precoder matrix V, to downlink transmissions of the network node to a plurality of wireless devices, WDs.

20 . A method in a network node, the method comprising:
receiving channel information, H m , from an infrastructure provider, InP; determining a normalized precoding matrix, W m , based at least in part on the received channel information H m ; transmitting a service demand and a normalized precoding matrix, W m , to the InP; receiving a downlink precoding matrix, V, from the InP to transmit messages to WDs, the downlink precoder matrix V being based at least in part on service demands and normalized precoding matrices, W, of a plurality of service providers; and applying the downlink precoder matrix V, to downlink transm

Assignees

• Ericsson Telefon Ab L M

Inventors

• Boudreau Gary
• Wang Juncheng
• Liang Ben
• Dong Min
• Abou-Zeid Hatem

Classifications

• H04B7/0452

  Multi-user MIMO systems · CPC title

• H04B7/024 Primary

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/063

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title

• H04B7/0634 Primary

  Antenna weights or vector/matrix coefficients · CPC title