Transmit power dependent reduced emissions from a wireless transceiver
First Claim
1. A method of reducing out of band emissions, performed by a base station, the method comprising:
- transmitting a downlink transmission;
receiving from a subscriber station a request for uplink transmission resources;
receiving, from the subscriber station, a feedback message including a power control metric based on the downlink transmission;
determining an expected power level at which the subscriber station is expected to transmit in an uplink transmission responsive to the power control metric received from the subscriber station;
determining a position of a portion of an available bandwidth for uplink transmissions based on the determined expected power level and based on a probability that the subscriber station transmitting at the expected power level will result in distortion products exceeding an emissions constraint associated with an emissions band; and
allocating to the subscriber station the portion of the available bandwidth for uplink transmissions, responsive to the request for uplink transmission resources and the determined expected power level.
3 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus for reducing out of band emissions through selective resource allocation, transmit power control, or a combination thereof. A resource controller, such as a base station, can allocate uplink resources to a requesting subscriber station based in part on an expected transmit power. The base station can allocate uplink bandwidth to the subscriber station based on an expected subscriber station uplink transmit power and a frequency of a restricted emissions band. Those subscriber stations having higher expected transmit powers are allocated bandwidth further from the restricted emissions band. The subscriber station can perform complementary transmit power control based on allocated uplink resources. The subscriber station can limit a transmit power based in part on a bandwidth allocation, modulation type allocation, or some combination thereof.
42 Citations
19 Claims
-
1. A method of reducing out of band emissions, performed by a base station, the method comprising:
-
transmitting a downlink transmission; receiving from a subscriber station a request for uplink transmission resources; receiving, from the subscriber station, a feedback message including a power control metric based on the downlink transmission; determining an expected power level at which the subscriber station is expected to transmit in an uplink transmission responsive to the power control metric received from the subscriber station; determining a position of a portion of an available bandwidth for uplink transmissions based on the determined expected power level and based on a probability that the subscriber station transmitting at the expected power level will result in distortion products exceeding an emissions constraint associated with an emissions band; and allocating to the subscriber station the portion of the available bandwidth for uplink transmissions, responsive to the request for uplink transmission resources and the determined expected power level. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of reducing out of band emissions performed by a subscriber station, the method comprising:
-
receiving a downlink transmission from a base station; determining a power control metric responsive to the downlink transmission received from the base station; transmitting a request for uplink transmission resources from the base station; transmitting a feedback message including the determined power control metric to the base station, the power control metric being useable by the base station to determine an expected power level at which the subscriber station is expected to transmit; receiving an allocation of a portion of an available bandwidth for the uplink transmission resources from the base station, the portion of the available bandwidth allocated for uplink transmissions received from the base station being responsive to the request for uplink transmission resources and the determined expected power level, the allocated portion of the available bandwidth for uplink transmission being positioned away from at least one band of interest to reduce out-of-band emissions therein; and determining a transmit power constraint responsive to the allocation of the portion of the available bandwidth for the uplink transmission resources received from the base station, the transmit power constraint being based on a position of the allocated portion of the available bandwidth. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A base station comprising:
-
a transmitter configured to transmit a downlink transmission; a receiver configured to receive a request for uplink transmission resources from a subscriber station, and to receive a feedback message comprising a power control metric from the subscriber station based on the downlink transmission; and an uplink resource controller configured to; determine an expected power level responsive to the power control metric received from the subscriber station at which the subscriber station is expected to transmit to the base station; determine a position of a portion of an available bandwidth for uplink transmissions based on the determined expected power level and on a probability that the subscriber station transmitting at the expected power level will result in distortion products exceeding an emissions constraint associated with an emissions band; allocate the portion of the available bandwidth for uplink transmissions to the subscriber station responsive to the request for uplink transmission resources and the determined expected power level; and generate an uplink resource message including an indication of uplink transmission resources that have been allocated to the subscriber station; the transmitter further configured to transmit the uplink resource message to the subscriber station. - View Dependent Claims (15, 16, 17)
-
-
18. A subscriber station comprising:
-
a receiver configured to receive a downlink transmission and an allocation of a portion of an available bandwidth for uplink transmission resources from a base station; a power detector configured to determine a power control metric based on the received downlink transmission; and a transmitter configured to transmit to the base station a request for the uplink transmission resources and a feedback message containing the power metric, wherein; the power control metric is usable by the base station to determine a power level at which the subscriber station is expected to transmit in the uplink; the portion of the available bandwidth allocated for uplink transmissions received from the base station is responsive to the request for uplink transmission resources and the determined expected power level, and is positioned away from at least one band of interest to reduce out-of-band emissions therein; and the transmitter is constrained to a maximum transmit power responsive to the allocation of the portion of the available bandwidth, the maximum transmit power being based on a position of the portion of the available bandwidth allocated for uplink transmissions. - View Dependent Claims (19)
-
Specification