Radio Map Uplink Power Control for Low-Signaling Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems rely heavily on resource-intensive and often inaccurate reference signal-based channel quality estimation, which is inefficient and interferes with wireless communications, particularly due to UE mobility and noisy channels.
Innovation Solution
Implement radio map-based channel quality determination, where a network entity provides a UE with radio maps indicating channel quality for different areas, allowing the UE to determine channel quality using geographical location, reducing the need for extensive reference signal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signal-based channel quality estimation is used, then channel quality can be determined, but resource utilization increases and timing efficiency decreases
Solution Approach 1:
Radio maps are pre-computed and stored before actual channel quality determination is needed. The network entity pre-calculates channel quality metrics for multiple possible UE locations and stores these in radio maps, so when a UE needs channel quality estimation, it can directly query the pre-computed values instead of performing real-time reference signal measurements and calculations
Solution Approach 2:
Instead of performing actual reference signal measurements and channel quality calculations in real-time, the system uses pre-computed radio maps that are copies of channel quality data for various locations. The UE queries the radio map to obtain channel quality information that replicates what would be obtained from actual reference signal measurements, but without the resource overhead
2Measurement precision
If reference signal-based channel quality estimation is used, then channel quality can be determined, but signaling requirements increase
Solution Approach 1:
The patent extracts only the essential channel quality information from the complex reference signal measurement process and stores it in radio maps. Instead of transmitting full reference signal sequences and requiring the UE to process them, the system extracts and stores pre-computed channel quality metrics (such as path loss, RSRP, RSRQ) that can be directly queried by the UE through lightweight signaling
Solution Approach 2:
The radio maps serve as copies of channel quality data that replace the need for extensive reference signal signaling. The UE obtains channel quality information by querying the radio map with its location coordinates rather than receiving and processing reference signal transmissions, dramatically reducing signaling overhead
3Measurement precision
If reference signal-based channel quality estimation is used, then channel quality can be determined, but resource utilization increases
Solution Approach 1:
All computationally intensive channel quality calculations are performed in advance by the network entity and stored in radio maps. When a UE needs channel quality information, it simply queries the pre-computed values based on its location, avoiding the need for the UE to perform energy-consuming reference signal measurements and calculations in real-time
Solution Approach 2:
The system uses pre-computed radio maps as copies of channel quality data, replacing energy-intensive real-time reference signal processing with lightweight queries of stored data. This significantly reduces the energy consumption of both the network entity and the UE while maintaining measurement accuracy
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a network entity, an activation signal that transitions the UE from a first mode where the UE is capable of determining a channel quality using reference signals from the network entity to a second mode where the UE is capable of determining the channel quality using radio maps associated with the network entity. The UE may receive, based at least in part on the activation signal, an indication of a set of radio maps associated with the network entity. The UE may perform a channel performance procedure to determine the channel quality associated with the network entity using the set of radio maps and a geographic location of the UE, the geographic location of the UE being mapped within the set of radio maps associated with the network entity.