Full Duplex Beam Pair Selection via Self-Interference Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently selecting optimal beam pairs for full-duplex transmission, leading to increased latency and reduced spectral efficiency due to self-interference and cross-link interference, especially in dynamic time division duplex configurations.
Innovation Solution
A method and apparatus for wireless communication that involve a base station and user equipment (UE) to perform self-interference and cross-link interference measurements, allowing for the identification and selection of candidate beam pairs based on these measurements, thereby reducing unnecessary computations and improving beam pair selection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex transmission is implemented without beam pair selection optimization, then spectral efficiency and latency reduction are achieved, but self-interference and cross-link interference increase
Solution Approach 1:
The base station performs preliminary self-interference measurements and cross-link interference measurements before finalizing beam pair selection. The base station measures self-interference for candidate beam pairs and obtains cross-link interference measurements from UEs, then uses these pre-acquired measurements to select optimal beam pairs that minimize interference while maintaining full-duplex operation.
Solution Approach 2:
The system implements feedback mechanisms where UEs report cross-link interference measurements to the base station, and the base station uses these feedback measurements to adjust beam pair selections. The beam measurement reports from UEs provide feedback that enables iterative optimization of beam pairs to reduce interference.
2Reliability
If comprehensive beam pair selection is performed without measurement triggers, then optimal beam pairs are identified, but computational complexity and measurement overhead increase
Solution Approach 1:
The base station performs preliminary self-interference measurements and identifies candidate beam pairs in advance. These pre-processed candidate beam pairs are then used when receiving measurement triggers from UEs, allowing the system to focus measurements only on relevant beam pairs rather than exhaustively measuring all possible combinations.
Solution Approach 2:
The beam pair selection process is segmented into multiple stages: the base station first identifies candidate beam pairs based on preliminary self-interference measurements, then uses UE measurement triggers to refine the selection. This segmentation divides the complex task of evaluating all beam pairs into manageable phases, reducing overall computational complexity.
3Measurement precision
If beam measurements are performed for all candidate beam pairs, then accurate beam pair selection is achieved, but measurement time and processing resources increase
Solution Approach 1:
The base station performs preliminary self-interference measurements and identifies candidate beam pairs before UE measurement triggers are received. This preliminary action filters out obviously suboptimal beam pairs, so when UEs send measurement triggers, the system only needs to perform measurements on a reduced set of candidate beam pairs, significantly reducing total measurement time while maintaining accuracy.
Solution Approach 2:
Instead of measuring all possible beam pairs, the system performs partial measurements on only the candidate beam pairs identified through preliminary self-interference measurements. This partial action approach achieves sufficient measurement precision for reliable beam pair selection without the time cost of exhaustive measurement.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in a full duplex transmission mode, a measurement trigger indicating a set of candidate base station beam pairs, wherein a candidate base station beam pair comprises a base station uplink (UL) beam and a base station downlink (DL) beam, wherein the corresponding identified UE beam pair comprises a UE UL beam and a UE DL beam, wherein the set of candidate base station beam pairs are identified based at least in part on a base station self-interference measurement; and transmit, to the base station, a beam measurement report based at least in part on a plurality of beam measurements obtained based at least in part on the measurement trigger. Numerous other aspects are provided.