Systems and methods for controlling the power at which a communication device transmits an uplink signal
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsGeorge Jöngren, Per Burström, Arne Simonsson, Stefano Sorrentino
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Abstract
According to some embodiments, there is provided a base station system configured to, among other things, (a) detect whether a particular UE is using too much power to transmit uplink data and (b) in response, transmit a message to the UE instructing the UE to detect a power control RS (PCRS) that is intended only for the particular UE. In some embodiments, the PCRS is transmitted such that the power (actual or nominal) of the PCRS as received by the UE is higher than the power of the previous CRS detected by the UE, thereby leading the UE to calculate a lower PL value, which can lead to the UE lowering its output power.
Claims31
A method for controlling dynamically the power at which a communication device transmits an uplink signal, comprising:
- transmitting data to the communication device from a first radio base station (RBS);
- determining, based on the power of a first uplink signal received at a second RBS and transmitted by the communication device, whether the transmission power of the communication device should be altered;
- in response to a determination that the transmission power of the communication device should be altered, transmitting from the first RBS and/or the second RBS, a communication device specific reference signal (CDS-RS), wherein
- the communication device is configured such that the communication device receives the CDS-RS, determines a measure of uplink transmission power level based on the received CDS-RS, and transmits a second uplink signal at the determined power level.
A base station system for controlling dynamically the power at which a communication device transmits an uplink signal, wherein the base station system comprises:
- one or more radio base stations (RBSs), the one or more RBSs collectively comprising electronic circuitry configured to:
- detect a first uplink signal transmitted by the communication device;
- determine the power of the detected signal;
- use the determined power of the detected signal to determine whether the communication device should transmit a second uplink signal at a power different than the power at which the communication device transmitted the first uplink signal;
- and
- in response to determining that the communication device should transmit the second uplink signal at a different power:
- (i) transmit to the communication device reference signal information (RSI) identifying a set of one or more downlink transmission resources, and (ii) transmit a communication device specific reference signal (RS) using the identified downlink transmission resources, wherein
- the communication device specific RS is a predefined signal known to the communication device prior to the base station system transmitting said device specific RS to the communication device.
A method for dynamically controlling the power at which a communication device transmits an uplink signal, wherein the method comprises:
- detecting a first uplink signal transmitted by the communication device;
- determining the power of the detected signal;
- using the determined power of the detected signal to determine whether the communication device should transmit a second uplink signal at a power different from the power at which the communication device transmitted the first uplink signal;
- and
- in response to determining that the communication device should transmit the second uplink signal at a different power:
- (i) transmitting to the communication device reference signal information (RSI) identifying a set of one or more downlink transmission resources, and
- (ii) transmitting a communication device specific reference signal (RS) using the identified downlink transmission resources, wherein
- the communication device specific RS is a predefined signal known to the communication device prior to the base station system transmitting said device specific RS to the communication device.
Dependencies are inferred from the claim text.