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

• US 9,362,991 B2
• Filed: 08/26/2015
• Issued: 06/07/2016
• Est. Priority Date: 02/15/2013
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Maltsev, Alexander, Sadri, Ali S., Pudeyev, Andrey, Nicholls, Richard B.
• Primary Examiner(s): REGO, DOMINIC E
• Application Number:
  US14/835,919
• Publication Number:
  US 20150365908A1
• Time in Patent Office: 286 Days
• Field of Search: 455/522, 455/67.11, 455 68- 70, 455/115.3, 455/126, 455/127.1, 455/127.2, 455/135, 455/226.3, 455/277.2, 455/296, 370/318
• US Class Current: 1/1
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0426 Power distribution
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04W 52/14 Separate analysis of uplink or downlink
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/26 using transmission rate or quality of service QoS [Quality of Service]
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

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.

Claims

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;

2. The apparatus of claim 1, wherein S_max is 18 microwatt to square centimeter (μ

W/cm²).

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;

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 (μ

W/cm²).

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.