US 12,713,363 B2Granted

Enhanced transmission power limit and joint input power limit for transmissions from multiple antenna ports for radio frequency exposure compliance

AssigneeQUALCOMM Incorporated

InventorsTienyow Liu, Farhad Meshkati, Yahia Ramadan, Huang Lou, Anant Gupta

Life of this patent

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Abstract

Techniques and apparatus for enhancing transmission power limits and joint input power limits for transmissions from multiple antenna ports in compliance with radio frequency (RF) exposure limits are described. A method that may be performed by a wireless communication device includes receiving, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas. The uplink grant indicates a transmission mode for the uplink transmission. A respective transmission power limit is determined for each antenna in the set of antennas, based at least in part on the transmission mode and in compliance with an RF exposure limit. The uplink transmission is sent via the set of antennas according to the respective transmission power limits.

Claims25

Dependent claims

A method for wireless communication by a wireless device, comprising:

receiving, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas, wherein the uplink grant indicates a transmission mode for the uplink transmission;
determining, for each antenna in the set of antennas, a respective transmission power limit in compliance with a radio frequency (RF) exposure limit, based at least in part on (i) the transmission mode and (ii) an RF exposure input power limit measurement that is associated with simultaneous transmission from a plurality of antennas in the set of antennas when the transmission mode is multiple-input, multiple-output (MIMO) transmission and the antenna is in a same antenna group as one or more other antennas in the set of antennas, wherein:
the RF exposure input power limit measurement comprises a joint RF exposure input power limit measurement associated with the simultaneous transmission from the plurality of antennas;
and
the joint RF exposure input power limit measurement is greater than a minimum single-antenna RF exposure input power limit measurement divided by a number of the plurality of antennas;
and
sending, via the set of antennas, the uplink transmission according to the respective transmission power limits.

4 more elements

An apparatus for wireless communication, comprising:

a receiver configured to receive, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas, wherein the uplink grant indicates a transmission mode for the uplink transmission;
a memory;
a processor coupled to the memory and being configured to determine, for each antenna in the set of antennas, a respective transmission power limit in compliance with a radio frequency (RF) exposure limit, based at least in part on (i) the transmission mode and (ii) an RF exposure input power limit measurement that is associated with simultaneous transmission from a plurality of antennas in the set of antennas when the transmission mode is multiple-input, multiple-output (MIMO) transmission and the antenna is in a same antenna group as one or more other antennas in the set of antennas, wherein:
the RF exposure input power limit measurement comprises a joint RF exposure input power limit measurement associated with the simultaneous transmission from the plurality of antennas;
and
the joint RF exposure input power limit measurement is greater than a minimum single-antenna RF exposure input power limit measurement divided by a number of the plurality of antennas;
and
a transmitter configured to send, via the set of antennas, the uplink transmission according to the respective transmission power limits.

5 more elements

An apparatus for wireless communication, comprising:

means for receiving, from a network entity, an uplink grant scheduling an uplink transmission from a set of antennas, wherein the uplink grant indicates a transmission mode for the uplink transmission;
means for determining, for each antenna in the set of antennas, a respective transmission power limit in compliance with a radio frequency (RF) exposure limit, based at least in part on (i) the transmission mode and (ii) an RF exposure input power limit measurement that is associated with simultaneous transmission from a plurality of antennas in the set of antennas when the transmission mode is multiple-input, multiple-output (MIMO) transmission and the antenna is in a same antenna group as one or more other antennas in the set of antennas, wherein:
the RF exposure input power limit measurement comprises a joint RF exposure input power limit measurement associated with the simultaneous transmission from the plurality of antennas;
and
the joint RF exposure input power limit measurement is greater than a minimum single-antenna RF exposure input power limit measurement divided by a number of the plurality of antennas;
and
means for sending, via the set of antennas, the uplink transmission according to the respective transmission power limits.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/362,615Filed 31 Jul 2023
Published: US 2025/0048280 A16 Feb 2025
Granted: 18 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04W 52/367
With a discrete range or set of values, e.g. step size, ramping or offsets: power values between minimum and maximum limits, e.g. dynamic range
H04B 1/3838
Hand-held transceivers: arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
H04B 7/0404
Using two or more spaced independent antennas: the mobile station comprising multiple antennas, e.g. to provide uplink diversity
H04B 7/0691
Hybrid systems, i.e. switching and simultaneous transmission: using subgroups of transmit antennas