Cellular wireless communication systems enhanced by intelligent self-organizing wireless distributed active antennas

• US 10,419,080 B2
• Filed: 01/28/2017
• Issued: 09/17/2019
• Est. Priority Date: 01/27/2016
• Status: Active Grant

• Current Assignee: RF DSP, Inc.
• Original Assignee: RF DSP, Inc.
• Inventors: Liang, Ping, Zhu, Dengkui
• Primary Examiner(s): Blanton, John D
• Application Number:
  US16/073,330
• Publication Number:
  US 20180351605A1
• Time in Patent Office: 962 Days
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming

Abstract

This invention presents Capacity Projectors (CaPs) for intelligent control and management that collect information on channel conditions, actual and/or predicted demand for connectivity, data throughput and its distribution for a first time period in the future using signaling and control messages, analyze the collected information to identify the configurations of the BSs and CaPs that are needed to produce desired MU-MIMO communication channels in the first time period to meet the connectivity and data throughput demand and its distribution in the first time period, and adaptively control and configure the CaPs to actively shape the MU-MIMO communication channels to meet the predicted demand and its distribution, wherein controlling and configuring the CaP comprises implementing which of the CaPs to switch to sleeping mode or work mode and adjusting one or more of transmitting power gain, antenna tilt, beam direction and/or pattern of the transmitter and/or receiver, filtering of the receiving and/or transmitting signal.

Claims

1. A controllable Capacity Projector (CaP) supporting an intelligent wireless communication system comprising one or more receiving paths and antennas;

one or more transmitting paths and antennas;

a work mode, a sleep mode; and

a control module, wherein the control module controls the switching between the sleep mode and the work mode and adjusts one or more of transmitting power gain, antenna tilt, beam direction and/or pattern of the transmitter and/or receiver, filtering of the receiving and/or transmitting signal, and provides functions to support one or more modules for intelligent control and management implemented in one or more processors, wherein the one or more modules for intelligent control and management collect information on channel conditions, actual and/or predicted demand for connectivity, data throughput and its distribution for a first time period in the future using signaling and control messages, analyze the collected information to identify the configurations of one or more Base Stations (BSs) and a plural of CaPs that are needed to produce desired communication channels with a plural of User Equipment (UEs) in the first time period to meet the connectivity and data throughput demand and distribution of the connectivity and data throughout demand in the first time period;

generate and send corresponding control messages to the plural of CaPs, and adaptively control and configure the plural of CaPs based on the control messages to actively shape the communication channels with a plural of UEs to improve the performance of the spatial multiplexing beamforming between the one or more BSs and the plural UEs to meet the predicted demand and distribution of the connectivity and data throughput, wherein said controlling and configuring the CaP comprises implementing which of the CaPs to switch to the sleep mode or the work mode and adjusting one or more of the transmitting power gain, the antenna tilt, the beam direction and/or the pattern of the transmitter and/or receiver, filtering of the receiving and/or the transmitting signal.

2. The controllable Capacity Projector in claim 1 wherein the control module of the CaP newly introduced into the intelligent wireless communication system carries out a process to register the CaP with a BS, reports the CaPs location or an index of its coverage area to the BS for it to be recorded into the BS'"'"'s memory, and receives and records a special Connection Identity (CID) sent to it by the BS, wherein the CID for a CaP is distinct from that of a UE.

3. The controllable Capacity Projector in claim 1 wherein the CaP after registering with a BS transmits probe signals at one or more power levels and directions in the uplink, whereas CaPs that are pre-existing in the intelligent wireless communication system and receive the probe signals of the newly registered CaP at sufficient Signal to Noise Ratios (SNRs) or signal strength feed back their CIDs to the BS, the said pre-existing CaPs further transmit uplink or downlink probe signals at one or more directions and power levels using resources allocated by the BS, and the newly registered CaP calculates the SNR or signal strength of the received probe signals of the said pre-existing CaPs, identifies the CIDs of the said pre-existing CaPs whose probe signals are received with sufficient SNR or signal strength and feeds them back to the BS for the BS to identify, record or update multiple-hop paths and the associated hop nodes that avoid loop conditions.

4. The controllable Capacity Projector in claim 1 wherein the CaP measures the signal strength of received uplink signals periodically while in sleep mode and switches into work mode when the measurement is within a specified range and switches into sleep mode when the measurement is outside the specified range, or sends a request to one or more BSs to switch into work mode when the measurement is within a specified range and makes the switch after receiving a control message from a BS consenting to the request.

5. The controllable Capacity Projector in claim 1 wherein the CaP switches into work mode or sleep mode based on downlink control signals it receives from a BS wherein the BS makes the switching decision using information of the locations of the CaP and the UEs that covered by the CaP, the Can M, and the information collected by the one or more modules for intelligent control and management.

6. The controllable Capacity Projector in claim 1 wherein the CaP with multiple transmitting or receiving paths and antennas performs MIMO beamforming using an analog beamforming circuit, or down-converts received signal to the baseband, performs Fast Fourier Transform (FFT) on the received signal and performs MIMO beamforming tuned to sub-carriers.

7. The controllable Capacity Projector in claim 1 wherein the CaP uses a first frequency band for receiving signals and a second frequency band for transmitting signals derived from the received signals.

8. The controllable Capacity Projector in claim 1 further comprises a first circuit path for broadcasting and/or control channel and second circuit path for data channel, wherein the second circuit path for data channel is turned off or put to sleep mode when the CaP has no UEs to serve in its coverage area while the first circuit for the broadcasting and/or control channel stays on.

9. The controllable Capacity Projector in claim 1 wherein the CaP inserts a CaP ID to the signal it transmits to the BS using designated resource elements.

10. The controllable Capacity Projector in claim 1 wherein the CaP broadcasts an identifier (CaP ID) in downlink and receives a feedback from UEs on the CaP ID they receive and optionally forward that information to one or more modules for intelligent control and management for identifying the association of UEs to one or more CaPs, and controlling and configuring the CaPs accordingly.

11. The controllable Capacity Projector in claim 10 wherein the CaP uses a distinct time and/or frequency resource from other CaPs in its neighborhood to broadcast its CaP ID to enable the detection of CaP IDs of multiple CaPs reaching the same UE.

12. The controllable Capacity Projector in claim 1 wherein the CaP communicates with one or more Wireless Positioning Devices (WPD) to detect, localize and identify the presence of UEs in its coverage area via a device-to-device (D2D) communication or machine type communication (MTC) channel, and provides the information to its control module and/or the one or more modules for intelligent control and management to control and configure the CaPs.

13. The controllable Capacity Projector in claim 1 further comprising a small cell mode and the control module switches the CaP to function as a CaP or a small cell based on messages it receives from the one or more modules for intelligent control and management, as a small cell using one frequency band or set of subcarriers and as a CaP using another frequency band or set of subcarriers at the same time.

14. The controllable Capacity Projector in claim 1 further comprising two or more downlink and uplink paths and functions as a CaP simultaneously for two neighboring BSs with a subset of downlink and uplink paths serving a first BS and another subset of downlink and uplink paths serving a second BS.

15. The controllable Capacity Projector in claim 1 wherein the control module lower or increase the gains of the CaP concurrently with one or more other CaPs so that the noise levels from one UE passing through one or more CaPs does not reduce the SNR of another UE, either with or without one or more CaPs in its channel.

16. The controllable Capacity Projector in claim 1 wherein the CaP with multiple transmitting paths obtains the channel estimates between the CaP and one or more UEs and uses the channel estimates to control the parameters of a filter embedded with each transmitting path to ensure when the signals from the multiple transmitting paths of the CaP reach one or more UEs, they add up coherently.

17. The controllable Capacity Projector in claim 1 wherein the CaP supports signaling for a BS to obtain estimates of the channels between the BS and one or more CaPs and the total channels between the BS and a plural of UEs.

18. The controllable Capacity Projector in claim 1 further comprising a positioning module and a mobility module that is capable of traveling under the command of a BS or a module for intelligent control and management, wherein the mobility module moves the CaP to a specified position and orientation in response to the control messages from the one or more modules for intelligent control and management.

19. The controllable Capacity Projector in claim 1 wherein the control module adjusts the antenna down tilts, beam pattern and/or transmission power gain of the CaP to reduce the interference caused by the CaP to one or more neighboring BS'"'"'s.

20. The controllable Capacity Projector in claim 1 further comprise an interference sensing module, and the CaP is configured in response to the detection of in-band interference near the CaP by the interference sensing module to prevent propagation of a local interferer.