Rx Beam Subset Scheduling for Low-Latency CMR Measurements
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing channel measurement resource (CMR) measurements due to the complexity and overhead associated with using a large number of receive (Rx) beams, which can lead to increased latency and resource utilization.
Innovation Solution
Implementing a restricted Rx beam subset during a time domain (TD) restriction window for performing CMR measurements, allowing UEs and network nodes to utilize a subset of Rx beams associated with the TD restriction window to report channel state information (CSI) more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of Rx beams are used for CMR measurements, then measurement coverage and accuracy are improved, but system complexity and overhead increase
Solution Approach 1:
The patent segments the full set of Rx beams into multiple subsets, where each subset is associated with a specific time domain window. Instead of using all Rx beams simultaneously for measurements, the system divides the measurement task across different time windows, each using a restricted subset of beams. This segmentation reduces the number of beams active at any given time, thereby reducing complexity while maintaining comprehensive measurement coverage over time.
Solution Approach 2:
The patent introduces dynamic time domain windows that move through different subsets of Rx beams. The measurement configuration changes dynamically based on the current time domain window, switching between different beam subsets. This dynamic approach allows the system to adaptively manage beam usage, reducing instantaneous complexity while maintaining measurement accuracy through temporal diversity.
2Measurement precision
If all Rx beams are used for measurements simultaneously, then measurement completeness is improved, but latency increases
Solution Approach 1:
The patent segments the measurement process into multiple time domain windows, each handling a specific subset of Rx beams. By dividing the complete measurement task across sequential time windows rather than attempting to process all beams simultaneously, the system reduces latency for individual beam measurements while maintaining completeness through the aggregation of results from all time windows.
Solution Approach 2:
The patent implements periodic measurement cycles where different subsets of Rx beams are measured in alternating time domain windows. This periodic action allows the system to complete measurements for all beams through repeated cycles, reducing the time required compared to sequential beam-by-beam measurement while maintaining measurement completeness.
3Productivity
If a restricted Rx beam subset is used during TD restriction window, then resource overhead and latency are reduced, but measurement coverage is limited
Solution Approach 1:
The patent segments the entire set of Rx beams into multiple disjoint subsets, with each subset assigned to a specific time domain window. This segmentation ensures that while each individual window uses only a restricted subset of beams (improving efficiency), the union of all time windows covers the complete set of beams (maintaining coverage). The segmentation is designed such that every beam is measured in at least one time window.
Solution Approach 2:
The patent adds a time dimension to the beam measurement process. Instead of measuring all beams simultaneously in a single time window, the system distributes measurements across multiple time windows. This dimensional transition from spatial-only beam selection to spatio-temporal beam selection allows restricted beam subsets to achieve comprehensive coverage through temporal expansion.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, a request to report measurements associated with channel measurement resources (CMRs). The UE may perform, during a time domain (TD) restriction window and based at least in part on the request, the measurements associated with the CMRs using receive (Rx) beams that are associated with a restricted Rx beam subset, wherein the restricted Rx beam subset is associated with the TD restriction window, and wherein the restricted Rx beam subset is a subset of a plurality of Rx beams associated with the UE. The UE may transmit, to the network node, a channel state information (CSI) report that indicates the measurements associated with the CMRs. Numerous other aspects are described.