Beam Pair Prediction for Low-Latency Wireless Beam Measurement
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Solution Overview
Problem
Traditional beam measurement and reporting methods are inefficient for higher frequencies, leading to high reference signal measurement overheads and latency, as wireless transmit/receive units (WTRUs) need to measure whole combinations of gNode B transmission and reception beams, and gNBs cannot simultaneously transmit multiple analog beams in different frequency resources with the same time resource.
Innovation Solution
A method involving a wireless transmit/receive unit (WTRU) that transmits Rx beam capability information, determines Rx beam IDs, receives RS resource sets, determines beam associations, and transmits preferred beam pair IDs, with the option of using a machine learning model for estimation beams, allowing for efficient beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional beam measurement and reporting methods are used, then beam identification can be achieved, but reference signal measurement overheads and latency increase significantly
Solution Approach 1:
The patent applies partial action by having the WTRU measure only a subset of available beams (e.g., 2 out of 8 TX beams) rather than all combinations. The WTRU reports measurements for fewer beam pairs, reducing measurement overhead and latency while still identifying suitable beams for communication.
Solution Approach 2:
The patent segments the beam measurement process into multiple phases: initial full beam sweep, followed by selective measurement of specific beam pairs. The WTRU divides the comprehensive measurement task into manageable portions, measuring all beams initially then focusing subsequent measurements on promising candidates only.
2Measurement precision
If whole combinations of gNode B transmission beams and WTRU reception beams are measured, then optimized beam identification is achieved, but measurement overheads increase
Solution Approach 1:
The WTRU performs partial beam measurement by selecting and measuring only a subset of TX-RX beam pairs. Instead of measuring all 8 TX beams × 4 RX beams = 32 combinations, the WTRU measures fewer combinations (e.g., 2 TX beams × 4 RX beams = 8 combinations), reducing reference signal overhead while identifying sufficient beam pairs.
Solution Approach 2:
The WTRU performs preliminary full beam sweeps to identify candidate beams, then uses these preliminary results to guide subsequent selective measurements. The initial comprehensive measurement phase provides information that reduces the need for exhaustive measurement in later phases.
3Adaptability or versatility
If gNB transmits multiple analog beams in different frequency resources, then beam diversity is improved, but simultaneous transmission capability decreases
Solution Approach 1:
The gNB transmits analog beams periodically across different frequency resources rather than simultaneously. Each TX beam is transmitted in sequence during beam sweeping, with periodic repetition. This periodic transmission enables beam diversity while managing the constraint that only one analog beam can be transmitted at a time.
Solution Approach 2:
The patent moves beam transmission from the time domain to the frequency domain. Instead of transmitting multiple beams simultaneously in time, the gNB transmits different TX beams across different frequency resources (frequency-division multiplexing of beams), achieving beam diversity without time-domain conflicts.
Data Source
AI summary
A method performed by a wireless transmit/receive unit (WTRU) may compromise: transmitting, to a base station, Rx beam capability information; determining a Rx beam ID for each of one or more Rx beams of the WTRU; receiving, from the base station, information indicating a first reference signal (RS) resource set and a second RS resource set; determining an association between the first RS resource set and second RS resource set and one or more Tx beam IDs; determining a preferred beam pair, including a preferred Rx beam and preferred Tx beam; and transmitting, to the base station, information indicating a beam pair ID of the preferred beam pair.