Open-Loop Power Control Without Downlink Signals Using RSRP Signatures
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Solution Overview
Problem
Existing open-loop power control mechanisms are not applicable for devices that do not transmit downlink reference signals, as they rely on measuring the received power of such signals to estimate pathloss.
Innovation Solution
Enhanced open-loop power control schemes that allow user equipment to estimate pathloss based on a signature of reference signal received power from multiple pathloss reference signals or other positioning technologies, using configuration information to determine pathloss differences and adjust transmission power accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing open-loop power control mechanisms are used, then devices can estimate pathloss by measuring received power of downlink reference signals, but this approach is not applicable for devices that do not transmit downlink reference signals
Solution Approach 1:
The patent introduces an intermediary approach where the network entity provides reference signal received power (RSRP) measurements to the WTRU, which then uses these as a basis for pathloss estimation. This mediator (network-provided RSRP) enables devices without downlink reference signal transmission capability to still perform power control by receiving alternative measurement data from the network.
Solution Approach 2:
The patent creates a copy of the pathloss estimation mechanism by having the network entity perform RSRP measurements and provide this data to the WTRU. Instead of the WTRU directly measuring downlink reference signals (which it cannot do), it receives copied measurement data from the network, enabling the same power control function to work for devices without transmission capability.
2Measurement precision
If the WTRU determines pathloss using the difference between RSRP measured at the RP and RSRP measured at the WTRU, then accurate pathloss estimation is achieved, but additional measurement and calculation complexity is introduced
Solution Approach 1:
The patent implements partial action by having the WTRU monitor only a subset of reference signals rather than all available reference signals. The network configures the WTRU with specific reference signal resources to monitor, reducing the measurement burden while still providing sufficient data for accurate pathloss estimation through the described difference calculation method.
3Adaptability or versatility
If the WTRU monitors a subset of reference signals configured by the network, then power control flexibility is improved, but the complexity of managing multiple reference signal configurations increases
Solution Approach 1:
The patent segments the reference signal monitoring task by dividing all available reference signals into multiple groups or subsets. The network configures the WTRU to monitor only specific subsets relevant to its location and service requirements. This segmentation reduces the total number of signals the WTRU must track while maintaining power control flexibility through selective monitoring.
Solution Approach 2:
The patent implements dynamic reference signal configuration where the network can reconfigure which reference signal subsets the WTRU should monitor based on changing conditions such as WTRU mobility, location, or service requirements. This dynamic adaptation allows the system to optimize power control accuracy while managing complexity through flexible, condition-based configuration.
Data Source
AI summary
Open loop power control may be based on an estimated pathloss. A set of transmission and reception points (TRPs) may provide a set of reference signals (RSs) to a reference point (RP). The RP, and/or the RP in conjunction with a network with which the RP is associated, may determine a RSRP for each received RS (signature of RSRPs). A WTRU may be configured with the signature of RSRPs. The TRP may provide the set of RSs to the WTRU. The WTRU may determine a set of RSRPs for the received RSs (RSRPWTRU). The WTRU may determine a difference between the signature RSs and RSRPWTRU. The WTRU may determine an estimated uplink pathloss associated with the WTRU and the RP based on the determined difference. The determined pathloss may be utilized in open-loop power control.