Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology

Patent metadata

Field	Value
Publication number	US-10194346-B2
Application number	US-201314086700-A
Country	US
Kind code	B2
Filing date	Nov 21, 2013
Priority date	Nov 26, 2012
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

Systems and methods are described for exploiting inter-cell interference to achieve multiplexing gain in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a MU-MAS of one embodiment comprises a wireless cellular network with multiple distributed antennas operating cooperatively to eliminate inter-cell interference and increase network capacity exploiting inter-cell multiplexing gain.

First claim

We claim:

1. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein power transmitted from the distributed antennas is not constrained to any particular power level, resulting in the intentional creation of inter-cell interference throughout the cell, the inter-cell interference exploited to increase capacity of the wireless communications network.

2. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein closed-loop precoding methods are employed to send simultaneous non-interfering data streams from the BTSs to the UEs over the downlink (DL) channel; and
wherein every UE uses the cell-specific reference signal (CRS) to estimate the channel state information (CSI) from all BTSs or from only the BTSs within its own user-cluster, wherein the user-cluster is defined as the set of BTSs that are reachable from the UE location.

3. The system as in claim 2 wherein the CP estimates the time and frequency selectivity of the channel and dynamically re-allocates the CRS for different BTSs to different resource elements.

4. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein closed-loop precoding methods are employed to send simultaneous non-interfering data streams from the BTSs to the UEs over the downlink (DL) channel; and
wherein every UE uses the CSI reference signal (CSI-RS) or the demodulation reference signal (DM-RS) or combination of both to estimate the CSI from all BTSs or from only the BTSs within its own user-cluster.

5. The system as in claim 4 wherein the transmit power from the BTSs is decreased to reduce the number of BTSs in the user-cluster below the maximum number of antennas supported by the CSI-RS scheme in the LTE standard.

6. The system as in claim 4 wherein the BTSs within the user-cluster are divided into subsets and the CSI-RS is sent from one subset of BTSs at a time with given periodicity.

7. The system as in claim 6 wherein the periodicity of the CSI-RS for different subsets is determined based on the channel coherence time of the UE as well as the periodicity values supported by the LTE standard.

8. The system as in claim 4 wherein different patterns and periodicities than in the LTE standard are allowed for the CSI-RS to enable higher number of BTSs in the system.

9. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein closed-loop precoding methods are employed to send simultaneous non-interfering data streams from the BTSs to the UEs over the downlink (DL) channel; and
wherein the UE reports the RI, PMI and CQI to the CP via the PUCCH.

10. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein closed-loop precoding methods are employed to send simultaneous non-interfering data streams from the BTSs to the UEs over the downlink (DL) channel;
wherein the UE reports the RI, PMI and CQI to the CP via the PUSCH.

11. The system as in claim 10 wherein the system estimates the channel frequency-selectivity and dynamically adjusts the PMI to support larger number of BTSs for the same available uplink (UL) resource.

12. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein open-loop precoding methods are employed to send simultaneous non-interfering data streams from the BTSs to the UEs over the DL channel.

13. A system comprising:
a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) comprising:
a plurality of wireless user devices;
a plurality of cooperative distributed antennas or wireless transceiver devices communicatively coupled to the wireless user devices and with overlapping coverage at locations of the wireless user devices;
a spatial processing logic employing spatial processing to exploit inter-cell interference for creating a plurality of concurrent non-interfering downlink or uplink data links with the user devices within the same frequency band;
wherein the wireless communications network is a cellular network such as the LTE network;
wherein open-loop-methods are employed to receive simultaneous non-interfering data streams f

Assignees

• Rearden Llc

Inventors

• Forenza Antonio
• Perlman Stephen G

Classifications

• H04B7/0452

  Multi-user MIMO systems · 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

• H04B7/0417

  Feedback systems · CPC title

• H04J11/0053

  using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022) · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title