PRS Configuration for Full Duplex Interference Management
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Solution Overview
Problem
Full duplex operations in wireless communication systems diminish the efficiency of terrestrial positioning processes by overlapping downlink and uplink channels, making it challenging to accurately utilize positioning reference signals (PRS) for location determination.
Innovation Solution
The method involves configuring a positioning frequency layer for full duplex operation and another for half duplex operation, allowing user equipment to receive and process PRS signals in downlink regions while ignoring overlapping uplink regions, and transmitting signals in a manner that excludes certain frequency bands to maintain accurate positioning reference signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex operations are implemented to improve communication efficiency, then spectral efficiency and data transmission rate are improved, but positioning reference signal processing accuracy deteriorates due to overlapping downlink and uplink channels
Solution Approach 1:
The frequency bandwidth is segmented into multiple sub-bands, with designated sub-bands for downlink PRS transmission and others for uplink transmission. This segmentation allows full duplex operation while preserving PRS measurement accuracy by preventing interference between downlink and uplink signals in the PRS frequency region.
Solution Approach 2:
Different quality characteristics are applied to different frequency regions: the PRS frequency region maintains half-duplex characteristics (no simultaneous uplink/downlink transmission) to ensure measurement accuracy, while other frequency regions operate in full-duplex mode to maximize communication efficiency.
2Loss of time
If downlink and uplink channels overlap in frequency to enable full duplex operation, then time efficiency is improved, but signal interference increases making positioning measurements inaccurate
Solution Approach 1:
The available frequency bandwidth is divided into multiple sub-bands, with specific sub-bands allocated for downlink PRS transmission and others for uplink transmission. This spatial-frequency segmentation enables time efficiency through full duplex operation in non-overlapping regions while preventing signal interference in the PRS measurement region.
Solution Approach 2:
Frequency division acts as an intermediary mechanism that separates downlink and uplink signals in the time domain while allowing simultaneous operation. By using frequency as a separating dimension, the system achieves time efficiency without direct signal interference between opposing transmission directions.
3Quantity of substance
If positioning reference signals are transmitted across the entire frequency bandwidth, then measurement coverage is improved, but interference from overlapping uplink signals increases
Solution Approach 1:
The frequency bandwidth is segmented into PRS sub-bands and non-PRS sub-bands. PRS sub-bands are configured for downlink transmission only with no overlapping uplink signals, while non-PRS sub-bands can support full duplex operation. This segmentation maintains measurement coverage through multiple PRS sub-bands while eliminating interference in the measurement frequency region.
Solution Approach 2:
The PRS transmission function is extracted from the entire frequency bandwidth and confined to specific designated sub-bands. This extraction allows the PRS to be transmitted with guaranteed quality free from uplink interference, while other frequency resources can be utilized for general communication purposes.
Data Source
AI summary
Techniques are provided for utilizing positioning reference signals (PRS) in full duplex scenarios. An example method for wireless communication by a user equipment (UE) includes receiving a positioning reference signal in a time slot, wherein the positioning reference signal spans a first frequency bandwidth, transmitting a signal in a second frequency bandwidth during the time slot, wherein the second frequency bandwidth includes frequencies within the first frequency bandwidth, and processing the positioning reference signal received in the first frequency bandwidth excluding the frequencies in the second frequency bandwidth.