Method, apparatus and system of antenna array dynamic configuration

Patent metadata

Field	Value
Publication number	US-9270022-B2
Application number	US-201113383009-A
Country	US
Kind code	B2
Filing date	Nov 11, 2011
Priority date	Nov 11, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A method ( 40 ) of antenna array dynamic configuration for 3-Dimension beamforming in wireless network is provided, comprising: determining ( 41 ) dynamically a mapping pattern for transforming a physical antenna array into a virtual antenna array based on time-varying downlink or uplink baseband channel statistics, from a set of candidate mapping patterns; and configuring ( 42 ) the physical antenna array as different virtual antenna arrays according to the dynamically determined mapping pattern. The corresponding apparatus, antenna array and wireless base station system are also provided. These are used to improve radio transmission bandwidth communication efficiency.

First claim

The invention claimed is:

1. A method of dynamically configuring an antenna array in a wireless network, comprising:
dynamically determining a mapping pattern for transforming a physical antenna array into a virtual antenna array based on time-varying downlink or uplink baseband channel statistics, from a set of candidate mapping patterns, wherein the virtual antenna array is a cluster of elements of the physical antenna array formed to achieve a dynamic three dimensional beamforming from the set of candidate mapping patterns, wherein the determining further comprises:
estimating channel status information from received signal samples of any uplink signals transmitted from user equipment;
calculating downlink beamforming matrices from the channel status information, and estimating system performance for each candidate mapping pattern;
selecting the mapping pattern having a highest metric according to the estimated system performance;

configuring the physical antenna array to form different virtual antenna arrays according to the dynamically determined mapping pattern.

2. The method of claim 1 further comprising:
making spatial or angular resolution of the virtual antenna array responsive to time-varying azimuth and elevation spreads of Degree of Departure (DoD) or Degree of Arrival (DoA) of signals to or from involved user equipment.

3. The method of claim 2 further comprising:
carrying out tradeoff between resolutions of azimuth and elevation to adapt to time-varying angle spreads of signal propagation.

4. The method of claim 1 wherein the determining is performed periodically or on demand to dynamically configure the virtual antenna array.

5. The method of claim 1 :
wherein each candidate mapping pattern is represented by a mapping matrix reflecting a mapping relationship between the physical antenna elements and the virtual antennas;
wherein each element of the mapping matrix comprises gain and phase information of the contribution of a physical antenna element to a respective virtual antenna;
wherein an element of the mapping matrix having a value of zero indicates that no contribution is made by the physical antenna element to the respective virtual antenna;
wherein an element of the mapping matrix having a non-zero value indicates that a contribution is made by the physical antenna element to the respective virtual antenna.

6. The method of claim 5 wherein the estimated system performance is reflected by statistics of signal-to-leakage power ratios (SLRs), and the mapping pattern (î) maximizing the statistics of SLRs is selected according to the following formula:

i
^

=

arg
⁢

⁢
max

i

⁢

⁢

E
t

(

∑

{

f
,
k

}

⁢

log
2

⁡

(

γ

[
i
]

⁡

(

f
,
k
,

)

)

)

where γ [i](f,k) is defined as a signal to leakage power ratio at sub-carrier f, a given user equipment k is assumed to employ sub-carrier f;

∑

{

f
,
k

}

denotes a summation over a full bandwidth; and

E
t

denotes the statistical mean of samples during a period of t.

7. The method of claim 1 wherein antenna configuration and the baseband signal statistics are both associated with 3-Dimensional beamforming.

8. The method of claim 1 wherein the physical antenna array comprises a number of fixed physical antenna elements, and wherein the virtual antenna array is configured to correspond to the candidate mapping patterns.

9. The method of claim 8 further comprising:
mapping the physical antenna elements into a number of virtual antenna arrays by weighted combining, or switching by a RF circuit or a baseband dimension-reduction circuitry network.

10. The method of claim 1 wherein the set of candidate mapping patterns is limited to a defined range of patterns.

11. The method of claim 1 wherein the baseband channel statistics reflects user equipment distribution variations which are embodied in variations of Degree of Arrival (DoA) or Degree of Departure (DoD) spreads of elevations and azimuths.

12. The method of claim 1 ,
wherein the set of candidate mapping patterns comprises mapping patterns of 2-Dimensional beamforming virtual antenna arrays and mapping patterns of 3-Dimensional beamforming virtual antenna arrays; and
wherein configuring the physical antenna array comprises configuring to form different 3-Dimensional beamforming virtual antenna arrays according to the dynamically determined mapping pattern.

13. An apparatus operative to reconfigure antenna arrays in a wireless network, comprising:
a mapping pattern control circuit configured to dynamically determine a mapping pattern for transforming a physical antenna array into a virtual antenna array based on time-varying downlink or uplink baseband channel statistics, from a set of candidate mapping patterns, wherein the virtual antenna array is a cluster of elements of the physical antenna array formed to achieve a dynamic three dimensional beamforming from the set of candidate mapping patterns, wherein the mapping pattern control circuit further comprises:
an estimator circuit configured to estimate channel status information from received signal samples of any uplink signals transmitted from user equipment;
a calculator circuit configured to calculate downlink beamforming matrices from the channel status information, and estimating system performance for each candidate mapping pattern;
a selector circuit

Assignees

• Zhang Zhan
• Qian Yu
• Song Xinghua
• Petersson Sven
• Ericsson Telefon Ab L M

Inventors

• Zhang Zhan
• Qian Yu
• Song Xinghua
• Petersson Sven

Classifications

• H04B7/0452

  Multi-user MIMO systems · CPC title

• H04B7/0465

  taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account · 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

• H04B7/0408

  using two or more beams, i.e. beam diversity · CPC title

• H04B7/0469

  taking special antenna structures, e.g. cross polarized antennas into account · CPC title