Dynamic user grouping in non-orthogonal multiple access (NOMA)—networks

Patent metadata

Field	Value
Publication number	US-11411689-B2
Application number	US-201816094741-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	May 15, 2018
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

A dynamic UE grouping method for dense NOMA systems. One objective is to improve the performance gain by adding virtual diversity into the network. An embodiment allows a network node to consider different groups of UEs for data transmission using NOMA based on the UEs' message decoding status without CSI updates.

First claim

The invention claimed is:

1. A dynamic user equipment (UE) grouping method performed by a network node (NN), the method comprising:
determining a first group of UEs for downlink (DL) data transmission, the first group of UEs comprising a first UE and a second UE;
the transmitting to both the first UE and the second UE information informing the first and second UE that the network node has included the first and second UE in the first group of UEs;
transmitting to both the first and second UE a first superimposed signal comprising a first message for the first UE and a second message for the second UE;
receiving a first negative acknowledgement (NACK) transmitted by the first UE, the first NACK indicating that the first UE was unable to decode the first message;
as a result of receiving the first NACK, determining a second group of UEs for DL data transmission, the second group comprising the first UE and a third UE;
the transmitting to both the first and third UE information informing the first and third UE that the NN has included the first and third UE in the second group of UEs; and
transmitting to both the first and third UE a second superimposed signal comprising the first message and a third message for the third UE.

2. The method of claim 1 , wherein transmitting the first superimposed signal comprises:
using a first set of beam forming weights to transmit the first superimposed signal.

3. The method of claim 2 , wherein transmitting the second superimposed signal comprises using a second set of beam forming weights to transmit the second superimposed signal.

4. A network node (NN) configured to:
determine a first group of user equipments (UEs) for downlink (DL) data transmission, the first group comprising a first UE and a second UE;
transmit to both the first UE and the second UE information informing the first and second UE that the NN has included the first and second UE in the first group of UEs;
transmit to both the first and second UE a first superimposed signal comprising a first message for the first UE and a second message for the second UE;
receive a first negative acknowledgement (NACK) transmitted by the first UE, the first NACK indicating that the first UE was unable to decode the first message;
as a result of receiving the first NACK, determine a second group of UEs for DL data transmission, the second group comprising the first UE and a third UE;
transmit to both the first and third UE information informing the first and third UE that the NN has included the first and third UE in the second group of UEs; and
transmit to both the first and a third UE a second superimposed signal comprising the first message and a third message for the third UE.

5. The NN of claim 4 , wherein transmitting the first superimposed signal comprises:
using a first set of beam forming weights to transmit the first superimposed signal.

6. The NN of claim 5 , wherein transmitting the second superimposed signal comprises using a second set of beam forming weights to transmit the second superimposed signal.

7. A computer program product comprising a non-transitory computer readable medium storing a computer program comprising instructions which, when executed by processing circuitry, causes the processing circuitry to carry out the method of claim 1 .

Assignees

• Ericsson Telefon Ab L M
• Telefonaktiebolaget Lm Ericsso Pubi

Inventors

• Makki Behrooz
• Behravan Ali
• Hashemi Mona

Classifications

• H04B7/0617

  for beam forming · CPC title

• H04W72/121

  for groups of terminals or users · CPC title

• H04L1/1887 Primary

  Scheduling and prioritising arrangements · CPC title