Apparatus, system and method of transmit power control for wireless communication

Patent metadata

Field	Value
Publication number	US-9362991-B2
Application number	US-201514835919-A
Country	US
Kind code	B2
Filing date	Aug 26, 2015
Priority date	Feb 15, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Some demonstrative embodiments include apparatuses, systems and/or methods of transmit power control for wireless communication. For example, an apparatus may include a controller to control a plurality of transmit powers of a plurality of directional beams formed by an antenna array to transmit a wireless communication. The controller may control the plurality of transmit powers based on at least first and second power limits, the first power limit including a power density limit corresponding to a power density of a directional beam of the plurality of directional beams, and the second power limit including a total transmit power limit corresponding to a total of the transmit powers.

First claim

What is claimed is:

1. An apparatus comprising:
a beamforming processor configured to perform beamforming processing of a wireless transmission via a plurality of directional beams to be formed by an antenna array; and
a transmit power controller configured to control a plurality of transmit powers of the plurality of directional beams based at least on the following criteria:

P
i

⁢

G
i

4
⁢

⁢
π
⁢

⁢

R
2

≤

S
max

∑

i
=
1

N

⁢

P
i

≤

P
0

≤

P
⁢

⁢
max

wherein P i denotes a transmit power of an i-th directional beam of said plurality of directional beams, G i denotes an antenna gain of the antenna array in a direction of the i-th directional beam, R denotes a predefined distance from said antenna array, S max denotes a power density limit, N denotes a number of said plurality of directional beams, P 0 denotes a maximal total transmit power of said antenna array, and P max denotes a total transmit power limit.

2. The apparatus of claim 1 , wherein S max is 18 microwatt to square centimeter (μW/cm 2 ).

3. The apparatus of claim 1 , wherein P max is 500 miliwatt (mW).

4. The apparatus of claim 1 , wherein R is 3 meter.

5. The apparatus of claim 1 , wherein said wireless transmission comprises a beamformed diversity transmission.

6. The apparatus of claim 1 , wherein said wireless transmission comprises a Multi-Input-Multi-Output (MIMO) transmission.

7. The apparatus of claim 6 , wherein said wireless transmission comprises a Multi-User (MU) MIMO transmission, said plurality of directional beams to be directed to a plurality of users.

8. The apparatus of claim 7 , wherein said transmit power controller is configured to select said plurality of users based on at least one predefined parameter.

9. The apparatus of claim 7 , wherein said transmit power controller is configured to select said plurality of users based at least on channel propagation losses of a plurality of channels corresponding to said plurality of users.

10. The apparatus of claim 1 comprising said antenna array.

11. The apparatus of claim 10 , wherein the antenna array comprises a plurality of antenna modules, an antenna module of said plurality of antenna modules comprising a plurality of antenna elements coupled to a Radio-Frequency (RF) chain.

12. The apparatus of claim 1 comprising a baseband processor, the baseband processor comprising the beamforming processor and the transmit power controller.

13. The apparatus of claim 1 , wherein said wireless transmission comprises a transmission over a millimeter-wave (mmWave) frequency band.

14. The apparatus of claim 1 being an access point.

15. The apparatus of claim 1 comprising a memory, and a network interface.

16. A product comprising a non-transitory storage medium having stored thereon instructions that, when executed by a machine, result in:
determining a plurality of transmit powers of a plurality of directional beams to be formed by an antenna array based at least on the following criteria:

P
i

⁢

G
i

4
⁢

⁢
π
⁢

⁢

R
2

≤

S
max

∑

i
=
1

N

⁢

P
i

≤

P
0

≤

P
⁢

⁢
max

wherein P i denotes a transmit power of an i-th directional beam of said plurality of directional beams, G i denotes an antenna gain of the antenna array in a direction of the i-th directional beam, R denotes a predefined distance from said antenna array, S max denotes a power density limit, N denotes a number of said plurality of directional beams, P 0 denotes a maximal total transmit power of said antenna array, and P max denotes a total transmit power limit; and
providing to a beamforming processor a plurality of values based on the plurality of transmit powers.

17. The product of claim 16 , wherein said plurality of values comprises a plurality of beamforming power weights.

18. The product of claim 16 , wherein S max is 18 microwatt to square centimeter (μW/cm 2 ).

19. The product of claim 16 , wherein P max is 500 miliwatt (mW).

20. The product of claim 16 , wherein R is 3 meter.

21. The product of claim 16 , wherein said plurality of directional beams comprises beams of a beamformed diversity transmission.

22. The product of claim 16 , wherein said plurality of directional beams comprises beams of a Multi-Input-Multi-Output (MIMO) transmission.

23. The product of claim 22 , wherein said MIMO transmission comprises a Multi-User (MU) MIMO transmission, said plurality of directional beams to be directed to a plurality of users.

24. The product of claim 16 , wherein said plurality of directional beams comprises beams of a wireless transmission over a millimeter-wave (mmWave) frequency band.

Assignees

• Intel Corp

Inventors

• Maltsev Alexander
• Sadri Ali S
• Pudeyev Andrey
• Nicholls Richard B

Classifications

• H04B7/0413 Primary

  MIMO systems · CPC title

• H04W52/26

  using transmission rate or quality of service QoS [Quality of Service] · CPC title

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W52/14

  Separate analysis of uplink or downlink · CPC title

• H04W52/143

  Downlink power control · CPC title