Full Duplex Beam Pairing via Self-Interference Thresholds
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Solution Overview
Problem
Existing full duplex communication systems face excessive latency and resource consumption due to exhaustive beam searching for suitable bi-directional beam pairs, and there is a lack of effective solutions for multi-user transmission considering cross-UE interference in full duplex scenarios.
Innovation Solution
The method involves selecting and reporting suitable transmit and receive beam pairs based on self-interference and isolation levels, with information sharing via sidelink to coordinate beam selection across multiple UEs, and using pre-defined associations between self-interference and cross-UE interference measurements to improve interference measurement assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exhaustive beam searching is performed to find suitable bi-directional beam pairs, then beam pairing accuracy is improved, but latency and resource consumption increase significantly
Solution Approach 1:
The system performs preliminary beam sweeping and reference signal transmission to pre-establish beam pairing information before full duplex communication begins. The base station and UE exchange beam pairing indicators and self-interference measurements in advance, so that when FD transmission starts, the beam pairs are already identified and ready for use, eliminating the need for exhaustive searching during actual communication.
Solution Approach 2:
The patent extracts only the necessary beam pairing information from the complete beam search process. Instead of evaluating all possible beam combinations, the system identifies and uses only those beam pairs that meet the self-interference threshold requirements, discarding unnecessary beam combinations to reduce searching complexity and time.
2Measurement precision
If exhaustive beam searching is performed to find suitable bi-directional beam pairs, then beam pairing accuracy is improved, but resource consumption increases significantly
Solution Approach 1:
Beam pairing information is established in advance through preliminary reference signal transmissions and self-interference measurements. The base station configures and indicates beam pairing information to UEs before FD communication begins, so that resource-intensive beam searching is performed only once during setup rather than continuously during operation.
Solution Approach 2:
The system performs beam searching and self-interference measurement only for the necessary subset of beam pairs that are likely to be used for FD communication, rather than exhaustively searching all possible beam combinations. This partial action approach achieves sufficient beam pairing accuracy without the excessive resource consumption of complete enumeration.
3Ease of operation
If beam pairs are selected without considering cross-UE interference, then beam selection simplicity is improved, but multi-user transmission success rate deteriorates
Solution Approach 1:
The system implements feedback mechanisms where UEs report self-interference measurements and beam pairing information to the base station. The base station uses this feedback to coordinate beam selection across multiple UEs, adjusting beam pairs to avoid cross-UE interference while maintaining relatively simple selection procedures through centralized control.
Solution Approach 2:
The base station acts as an intermediary that coordinates beam selection among multiple UEs. It receives beam capability information from UEs, performs centralized beam pairing optimization considering cross-UE interference, and indicates the final beam pairs to each UE. This intermediary approach maintains simplicity at the UE side while achieving reliable multi-user transmission through network coordination.
Data Source
AI summary
Aspects of the present disclosure provide a manner of avoiding excessive latency and resource consumption due to exhaustive beam searching and pairing for finding an appropriate bi-directional beam pair combination with manageable mutual interference to enable point-to-point FD transmission. Aspects of the present disclosure also provide a solution for enabling multi-user transmission where one or all UEs are with FD capability and the cross-UE interference raised from FD transmission are measured and taken into account during multi-user pairing.