# US 11,451,281 B2 · Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology

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- Number: US 11,451,281 B2
- Document ID: US11451281B2
- Status: Granted
- Kind: B2
- Application number: 17/100,875
- Filed: 2020-11-21
- Published: 2021-04-08
- Granted: 2022-09-20
- Earliest claimed: 2013-03-12
- Assignees: Rearden, LLC
- Applicants: Rearden, LLC
- Inventors: Antonio Forenza; Stephen G. Perlman
- Web page: https://patentgrep.com/patent/US11451281B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0452: Multi-user MIMO systems
- H04B: TRANSMISSION

## Abstract

A multiple antenna system (MAS) with multiuser (MU) transmissions (“MU-MAS”) exploiting inter-cell multiplexing gain via spatial processing to increase capacity in wireless communications networks.

## Claims

### Claim 1

A multiple antenna system (MAS) with multiuser (MU) transmissions (MU-MAS) comprising:
a plurality of antennas or wireless transceiver devices (BTSs) distributed throughout a coverage area without cells, all sharing the same cell identifier (cell ID);
a plurality of wireless user devices (UEs) communicatively coupled to the BTSs;
the MU-MAS chooses a first subset of BTSs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs; and
a spatial processing unit exploits interference among the BTSs to create a plurality of concurrent non-interfering downlink (DL) or uplink (UL) data links, including control channel links, between the first subset of BTSs and the UEs within the same frequency band.

### Claim 2 (depends on 1)

The system as in claim 1 wherein the MU-MAS chooses the first subset of BTSs to schedule data communications.

### Claim 3 (depends on 1)

The system as in claim 1 wherein the data communications capacity of the MU-MAS is shared among the plurality of UEs.

### Claim 4 (depends on 2)

The system as in claim 2 wherein the data communications capacity of the MU-MAS is shared among the plurality of UEs.

### Claim 5 (depends on 1)

The system as in any one of claim 1, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 6 (depends on 2)

The system as in any one of claim 2, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 7 (depends on 3)

The system as in any one of claim 3, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 8 (depends on 4)

The system as in any one of claim 4, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 9 (depends on 5)

The system as in claim 5 wherein the first and second subsets of BTSs are disjoint.

### Claim 10 (depends on 6)

The system as in claim 6 wherein the first and second subsets of BTSs are disjoint.

### Claim 11 (depends on 7)

The system as in claim 7 wherein the first and second subsets of BTSs are disjoint.

### Claim 12 (depends on 8)

The system as in claim 8 wherein the first and second subsets of BTSs are disjoint.

### Claim 13

A method implemented within a multiple antenna system (MAS) with multiuser (MU) transmissions (MU-MAS) comprising:
distributing a plurality of antennas or wireless transceiver devices (BTSs) throughout a coverage area without cells, all sharing the same cell ID;
communicatively coupling a plurality of wireless user devices (UEs) to the BTSs;
the MU-MAS choosing a first subset of BTSs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs; and
exploiting interference among the BTSs to create a plurality of concurrent non-interfering DL or UL data links, including control channel links, between the first subset of BTSs and the UEs within the same frequency band.

### Claim 14 (depends on 13)

The method as in claim 13 wherein the MU-MAS chooses the first subset of BTSs to schedule data communications.

### Claim 15 (depends on 13)

The method as in claim 13 wherein the MU-MAS shares the data communications capacity of the MU-MAS among the plurality of UEs.

### Claim 16 (depends on 14)

The method as in claim 14 wherein the MU-MAS shares the data communications capacity of the MU-MAS among the plurality of UEs.

### Claim 17 (depends on 13)

The method as in any one of claim 13, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 18 (depends on 14)

The method as in any one of claim 14, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 19 (depends on 15)

The method as in any one of claim 15, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 20 (depends on 16)

The method as in any one of claim 16, wherein the MU-MAS chooses a second subset of BTSs at a different time interval than when the MU-MAS chooses the first subset of BTSs.

### Claim 21 (depends on 17)

The method as in claim 17 wherein the first and second subsets of BTSs are disjoint.

### Claim 22

A multiple antenna system (MAS) with multiuser (MU) transmissions (MU-MAS) comprising:
a plurality of antennas or wireless transceiver devices (BTSs) distributed throughout a coverage area without cells, all sharing the same cell identifier (cell ID);
a plurality of wireless user devices (UEs) communicatively coupled to the BTSs;
the MU-MAS chooses a first subset of BTSs and a first subset of UEs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs; and
a spatial processing unit exploits interference among the BTSs to create a plurality of concurrent non-interfering downlink (DL) or uplink (UL) data links, including control channel links, between the first subset BTSs and the first subset of UEs within the same frequency band.

### Claim 23 (depends on 22)

The system as in claim 22 wherein the MU-MAS chooses the first subset of BTSs and first subset of UEs to schedule data communications.

### Claim 24 (depends on 22)

The system as in claim 22 wherein the data communications capacity of the MU-MAS is shared among the plurality of UEs.

### Claim 25 (depends on 23)

The system as in claim 23 wherein the data communications capacity of the MU-MAS is shared among the plurality of UEs.

### Claim 26 (depends on 22)

The system as in any one of claim 22, wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 27 (depends on 23)

The system as in any one of claim 23, wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 28 (depends on 24)

The system as in any one of claim 24, wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 29 (depends on 25)

The system as in any one of claim 25, wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 30 (depends on 29)

The system as in claim 29 wherein the first and second subsets of BTSs and/or the first and second subsets of UEs are disjoint.

### Claim 31

A method implemented within a multiple antenna system (MAS) with multiuser (MU) transmissions (MU-MAS) comprising:
distributing a plurality of antennas or wireless transceiver devices (BTSs) throughout a coverage area without cells, all sharing the same cell ID;
communicatively coupling a plurality of wireless user devices (UEs) to the BTSs;
the MU-MAS choosing a first subset of BTSs and a first subset of UEs for downlink and uplink data communications based on the spatial diversity between the UEs and BTSs; and
exploiting interference among the BTSs to create a plurality of concurrent non-interfering DL or UL data links, including control channel links, between the first subset of BTSs and the first subset of UEs within the same frequency band.

### Claim 32 (depends on 31)

The method as in claim 31 wherein the MU-MAS chooses the first subset of BTSs and first subset of UEs to schedule data communications.

### Claim 33 (depends on 31)

The method as in claim 31 wherein the MU-MAS shares the data communications capacity of the MU-MAS among the plurality of UEs.

### Claim 34 (depends on 32)

The method as in claim 32 wherein the MU-MAS shares the data communications capacity of the MU-MAS among the plurality of UEs.

### Claim 35 (depends on 31)

The method as in any one of claim 31 wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 36 (depends on 32)

The method as in any one of claim 32 wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 37 (depends on 33)

The method as in any one of claim 33 wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 38 (depends on 34)

The method as in any one of claim 34 wherein the MU-MAS chooses a second subset of BTSs and a second subset of UEs at a different time interval than when the MU-MAS chooses the first subset of BTSs and first subset of UEs.

### Claim 39 (depends on 19)

The method as in claim 19 wherein the first and second subsets of BTSs and/or the first and second subsets of UEs are disjoint.