Beam Pair Selection for Full Duplex Timing Constraints
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Solution Overview
Problem
Full-duplex (FD) communication in wireless systems faces challenges with self-interference due to the leakage of uplink signals at user equipment (UE), which affects the decoding of downlink signals, and existing technologies lack effective methods to align timing constraints for beam pair selection to mitigate this issue.
Innovation Solution
The proposed solution involves determining and reporting beam pairs for FD communication based on a timing constraint that ensures a time difference between downlink (DL) and uplink (UL) signal receptions is less than the cyclic prefix duration, facilitating orthogonal frequency division multiplexed symbol orthogonality and reducing self-interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communication is implemented without timing constraint alignment, then communication efficiency is improved by allowing simultaneous DL and UL transmissions, but self-interference occurs due to UL signal leakage affecting DL signal decoding
Solution Approach 1:
The patent changes the timing parameter of beam pair selection by introducing a timing constraint that aligns DL and UL signal receptions within a specific time window (less than cyclic prefix duration). This parameter change transforms the beam pair selection process from a static quality-based selection to a dynamic timing-aware selection, enabling simultaneous DL/UL transmissions while maintaining signal orthogonality and reducing self-interference.
Solution Approach 2:
The patent performs preliminary timing alignment of DL and UL beam pairs before actual full-duplex communication begins. By pre-selecting beam pairs that satisfy the timing constraint (where the time difference between DL and UL signal receptions is less than the cyclic prefix duration), the system prepares the communication channels in advance to prevent self-interference, rather than attempting to mitigate it during active transmission.
2Device complexity
If beam pair selection is performed without considering timing constraints, then device complexity is reduced by simplifying the selection process, but signal decoding accuracy deteriorates due to self-interference from misaligned DL and UL receptions
Solution Approach 1:
The patent modifies the beam pair selection parameters by adding a timing constraint condition. Instead of selecting beam pairs based solely on signal quality metrics, the system now evaluates both timing alignment (time difference between DL and UL receptions) and signal quality. This dual-parameter approach maintains manageable device complexity while significantly improving signal decoding accuracy by ensuring orthogonality between simultaneous DL and UL transmissions.
3Object-generated harmful factors
If timing constraint is enforced for beam pair selection, then self-interference is reduced through orthogonal DL and UL receptions, but device complexity increases due to the need for timing-based beam pair evaluation and reporting
Solution Approach 1:
The patent performs preliminary timing-based beam pair evaluation and filtering before the reporting stage. By pre-identifying and filtering beam pairs that satisfy the timing constraint, the system reduces the number of candidate beam pairs that need to be reported and processed. This preliminary action shifts computational complexity from the reporting phase to the evaluation phase, thereby reducing overall device complexity while still achieving self-interference reduction through timing alignment.
Solution Approach 2:
The patent extracts and separates the timing constraint evaluation from the overall beam pair selection process. By independently evaluating the timing condition (time difference between DL and UL receptions) as a separate filter criterion, the system simplifies the complexity management. Devices only need to report beam pairs that satisfy both the timing constraint and signal quality requirements, rather than processing all possible beam pairs, thus reducing reporting complexity while maintaining self-interference mitigation.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for beam pair selection. A method that may be performed by a user equipment (UE) includes receiving, from a base station (BS), an indication to report one or more beam pairs to be used for full-duplex (FD) communication based on a timing constraint, wherein the timing constraint comprises a constraint on a time difference between receptions, at the UE, of a downlink (DL) signal and an uplink (UL) signal for each of the one or more beam pairs and transmitting a report specifying the one or more beam pairs in accordance with the indication, in accordance with aspects of the present disclosure.