Uplink CLI Measurements for RSSI-Based UE Ranging
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the range between user equipment (UEs) due to cross-link interference (CLI), which affects the precision of positioning methods, particularly for low-tier UEs with limited power and processing capabilities.
Innovation Solution
The method involves performing CLI measurements based on received signal strength indicator (RSSI) to determine pathloss, allowing UEs or base stations to calculate the range between locations using uplink transmission power and RSSI measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional positioning methods are used, then positioning can be performed, but positioning accuracy deteriorates due to cross-link interference affecting RSSI measurements
Solution Approach 1:
The patent converts the harmful cross-link interference into a useful measurement resource. By having the victim UE measure the CLI from the aggressor UE's uplink transmission, the interference that would normally degrade positioning accuracy is transformed into a direct measurement of the aggressor UE's signal characteristics. This enables the victim UE to determine pathloss and calculate range to the aggressor UE, improving positioning accuracy while the aggressor UE continues its normal uplink transmission without additional overhead.
2Loss of information
If low-tier UEs perform positioning measurements, then positioning information can be obtained, but power consumption increases beyond the limited capabilities of low-tier UEs
Solution Approach 1:
The patent enables low-tier UEs to obtain positioning information by utilizing existing uplink transmissions from aggressor UEs. The victim UE (low-tier UE) performs CLI measurements on already-present uplink signals without requiring additional dedicated measurement signals or transmissions. This self-service approach allows the low-tier UE to determine pathloss and calculate range to neighboring UEs using resources that already exist in the system, avoiding the power consumption associated with generating or requesting additional positioning signals.
Solution Approach 2:
The patent allows low-tier UEs to perform positioning measurements partially by utilizing only the uplink transmissions that are already present in the system. Rather than requiring complete dedicated positioning procedures, the low-tier UE leverages existing CLI measurements and uplink power measurements to obtain sufficient positioning information, reducing the overall measurement and processing burden on power-constrained devices.
3Measurement precision
If dedicated positioning signals are transmitted, then positioning accuracy improves, but system overhead and complexity increase
Solution Approach 1:
The patent makes the uplink transmission serve multiple functions simultaneously. The aggressor UE's uplink transmission functions both as a regular uplink signal for communication purposes and as a measurement signal for CLI measurements by victim UEs. This multi-functionality eliminates the need for separate dedicated positioning signals, reducing system overhead and complexity while still providing the necessary information for accurate positioning calculations.
Solution Approach 2:
The patent merges the positioning measurement function with the existing uplink transmission function. By combining these functions, the system avoids the complexity of implementing separate positioning signal generation, transmission, and measurement procedures. The victim UE measures CLI on the same resources where uplink transmissions occur, and the base station utilizes both CLI measurements and uplink power measurements together to determine pathloss and enable positioning, streamlining the overall system architecture.
Data Source
AI summary
In a wireless communication system, cross-link interference (CLI) measurements are used for received signal strength indicator (RSSI) based positioning. A first user equipment (UE) receives from a base station, a first message comprising a cross-link interference (CLI) configuration; performs one or more CLI measurements associated with an uplink transmission of a second UE based on the CLI configuration; receives a second message comprising an uplink transmission power measurement of the second UE; determines a pathloss associated with the second UE based on the one or more CLI measurements and the uplink transmission power measurement; and determines a range between a location of the first UE and a location of the second UE based on the pathloss.