PDCCH Beam Selection Across Multiple CORESETs for Lower Latency
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam selection and activation to reduce latency, particularly in high-speed vehicular scenarios and multi-TRP/panel operations, leading to issues like increased latency, overhead, and UL coverage loss.
Innovation Solution
Implementing methods for UE to monitor and report on multiple Control Resource Sets (CORESETs) and beams, using unified TCI frameworks for dynamic signaling to enhance beam management, including common beams for data and control transmission, and optimizing UL beam selection to mitigate MPE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional beam selection methods are used, then system complexity is reduced, but latency increases and beam management efficiency decreases
Solution Approach 1:
The system performs preliminary beam measurements and evaluations before actual data transmission is needed. The UE measures multiple candidate beams and prepares beam selection information in advance, so that when beam selection is required, the process can be completed quickly using pre-evaluated options rather than performing measurements from scratch.
Solution Approach 2:
The beam management process is segmented into distinct phases: measurement phase where the UE evaluates multiple candidate beams, reporting phase where beam selection information is transmitted to the network, and activation phase where the selected beam is applied. This segmentation allows each phase to be optimized independently and reduces overall latency by enabling parallel processing of measurements across multiple beams.
2Productivity
If multiple CORESETs and beams are monitored, then beam management efficiency improves, but signaling overhead increases
Solution Approach 1:
The beam selection reporting mechanism is designed to be universal and can be applied across multiple CORESETs and different beam types (DL and UL beams). The same reporting framework handles various beam scenarios, reducing the need for separate signaling procedures for different cases and thereby reducing overall overhead while maintaining high beam management efficiency.
Solution Approach 2:
The system dynamically changes reporting parameters based on the current beam configuration and network conditions. When multiple beams are being monitored, the UE adjusts the granularity and frequency of reports to match the actual need, transmitting detailed information only when beam changes are detected or when quality thresholds are crossed, thus reducing unnecessary overhead while maintaining efficient beam management.
3Loss of time
If fast beam activation is implemented, then latency is reduced, but reliability of beam selection may worsen
Solution Approach 1:
The system performs preliminary validation of candidate beams during the measurement and reporting phases. The UE evaluates multiple candidate beams against quality thresholds and selects only those that meet reliability criteria before reporting. This preliminary filtering ensures that fast activation does not compromise reliability, as only pre-validated beams are activated quickly.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports beam selection information including quality metrics to the network. The network can provide feedback on the selected beams and adjust configurations to maintain reliability. This feedback loop ensures that fast beam activation is accompanied by continuous quality monitoring and adjustment, preventing reliability degradation.
Data Source
AI summary
Methods, systems, and apparatuses are provided for beam selection and reporting in a wireless communication system to enhance latency reduction for Downlink (DL)/Uplink (UL) beam selection and activation. A User Equipment (UE) can monitor Physical Downlink Control Channel (PDCCH) on multiple Control Resource Sets (CORESETs) in a first cell, transmit a signaling to a network, wherein the signaling indicates information of a first beam, and monitor PDCCH on the multiple CORESETs via the first beam based on the signaling.