Massive MIMO multi-user beamforming and single channel full duplex for wireless networks

• US 10,461,814 B2
• Filed: 09/27/2017
• Issued: 10/29/2019
• Est. Priority Date: 11/17/2013
• Status: Active Grant

• Current Assignee: RF DSP, Inc.
• Original Assignee: RF DSP, Inc.
• Inventors: Liang, Ping
• Primary Examiner(s): Nooristany, Sulaiman
• Application Number:
  US15/717,872
• Publication Number:
  US 20180309480A1
• Time in Patent Office: 762 Days
• CPC Class Codes: H04B 1/1018 noise filters connected between the power supply and the receiver suppression or limitation of noise from electric apparatus H04B15/00; demodulation H03D; ripple filters H02M1/14; filters in general 95G, H03H; power supplies H04B1/1607
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/32 Hierarchical cell structures
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

This invention presents a method and apparatuses for wireless networking comprising one or more BS with N_bs antennas; two or more SCs in the range of a BS where a SC has N_sc antennas, uses N_sc1≤N_sc antennas for communication with a BS and uses N_sc2≤N_sc antennas for communication with one or more UEs; at the same time a BS transmitting DL signals to K SCs using multi-user transmit BF in a frequency channel, a SC simultaneously transmitting DL signals to one or more UEs in its range using the same frequency channel; and, at the same time a BS receiving UL signals from K SCs using multi-user receive BF in a frequency channel, a SC simultaneously receiving UL signals from one or more UEs in its range using the same frequency channel. Furthermore, beamforming using antennas on the SCs is performed to reduce the inter-SC interferences.

Claims

1. A method for wireless networking comprising one or more Base Stations (BSs) with Nbs antennas;

two or more Small Cells (SCs) in a range of a BS of said one or more BSs where a SC has Nsc antennas, uses Nsc1≤

Nsc antennas for communication with the BS and uses Nsc2≤

Nsc antennas for communication with one or more User Equipment (UEs);

at the same time the BS transmitting Downlink (DL) signals to K SCs using a multi-user transmit beamforming (BE) in a frequency channel where K>

1 and Nbs≥

KNsc1, based on evaluation of the BS-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment, allocating frequency resources for the one or more SCs to simultaneously transmitting DL signals to one or more UEs in their ranges; and

, at the same time the BS receiving Uplink (UL) signals from K SCs using the multi-user receive BF in a frequency channel where K>

1 and Nbs≥

KNsc1, based on evaluation of the BS-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment, allocating frequency resources for the one or more SC to simultaneously receiving UL signals from one or more UEs in their ranges;

wherein the wireless networking further comprising choosing the number of antennas on the BS Nbs to be sufficiently larger than the total number of antennas for communicating with the BS on all the SCs served using the same frequency resource to match the throughput of the link between the BS and SCs with the sum throughput of the SCs.

2. The method in claim 1 further comprising transmitting DL signals to UEs using a first frequency channel at one time slot and receiving UL signals from UEs using the same first frequency channel at another time slot in a Time-Division Duplexing network.

3. The method in claim 1 further comprising the BS estimating the channel matrix Hb_s by having SCs transmits UL pilot signals, and using channel reciprocity to estimate the downlink channel from the BS to the SCs.

4. The method in claim 1 further comprising simultaneously, the one or more SCs transmitting DL signals to UEs using a first frequency channel and receiving UL signals from UEs using a second frequency channel in a Frequency-Division Duplexing network.

5. The method in claim 1 further comprising allocating a different frequency segment or set of subcarriers to each BS-SC-UE(s) path that is causing significant inter-SC interference.

6. The method in claim 1 further comprising using both wired backhaul to some SCs and wireless backhaul to other SCs in a wireless network.

7. An apparatus with a memory and processor for wireless networking comprising a baseband and radio frequency components supporting N_bs antennas;

communicating wirelessly with two or more SCs in the range of the apparatus where a SC has Nsc antennas and use Nsc1≤

Nsc antennas for communication with the apparatus and Nsc2≤

Nsc antennas for communication with one or more UEs;

at the same time the apparatus transmitting DL signals to K SCs using a multi-user transmit beamforming (BF) in a frequency channel where K>

1 and Nbs≥

KNsc1, based on evaluation of the BS-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment, allocating frequency resources for the one or more SC to simultaneously transmitting DL signals to one or more UEs in their ranges; and

, at the same time the apparatus receiving UL signals from K SCs using the multi-user receive BF in a frequency channel where K>

1 and Nbs≥

KNsc1, based on evaluation of the BS-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment, allocating frequency resources for the one or more SC to simultaneously receiving UL signals from one or more UEs in their ranges;

wherein the apparatus further comprising choosing the number of antennas on the BS Nbs to be sufficiently larger than the total number of antennas for communicating with the BS on all the SCs served using the same frequency resource to match the throughput of the link between the BS and SCs with the sum throughput of the SCs.

8. An apparatus with a memory and processor for wireless networking comprising a baseband and radio frequency components supporting Nsc antennas, using Nsc1≤

Nsc antennas for communication with a BS with Nbs antennas and using Nsc2≤

Nsc antennas for communication with one or more UEs;

two or more apparatus communicating wirelessly with a BS;

at the same time a BS transmitting DL signals to K apparatuses using a multi-user transmit beamforming (BF) in a frequency channel where K>

1 and Nbs≥

KNsc1, an apparatus using frequency resources allocated to it based on evaluation of the B S-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment to simultaneously transmit DL signals to one or more UEs in its range using the same frequency channel; and

, at the same time a BS receiving UL signals from K apparatuses using the multi-user receive BF in a frequency channel where K>

1 and Nbs≥

KNsc1, an apparatus using frequency resources allocated to it based on evaluation of the BS-UE interferences and the SC-SC interferences using analysis of the deployment and path loss assessment to simultaneously receive UL signals from one or more UEs in its range using the same frequency channel;

wherein the apparatus further comprising choosing the number of antennas on the BS Nbs to be sufficiently larger than the total number of antennas for communicating with the BS on all the SCs served using the same frequency resource to match the throughput of the link between the BS and SCs with the sum throughput of the SCs.