SRS Beam Selection Rules for Reliable Uplink Channel Estimation
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Solution Overview
Problem
Wireless communication systems face challenges in selecting optimal beams for signal transmission and reception due to insufficient signaling protocols providing necessary information for beam selection, leading to suboptimal decoding and channel estimation performance.
Innovation Solution
A wireless device determines and selects beams for signal transmission based on various considerations, aligning with a selection rule that improves decoding, uplink channel estimation, and scheduling, utilizing techniques such as sounding reference signals (SRS) and beam management procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If signaling protocols are used to provide beam selection information, then beam selection capability is improved, but signaling complexity and overhead increase
Solution Approach 1:
The patent extracts the essential beam selection information from complex signaling protocols and implements a simplified selection mechanism at the wireless device. The device autonomously selects beams based on local measurements and pre-configured parameters, removing the need for extensive signaling exchange while maintaining beam selection capability.
Solution Approach 2:
The wireless device performs self-service beam selection by autonomously determining optimal beams based on local channel measurements and pre-configured beam parameters. This self-directed beam selection eliminates dependency on complex network signaling while improving operational efficiency.
2Device complexity
If beam selection is performed without sufficient information, then signaling overhead is reduced, but decoding and channel estimation performance deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring beam parameters, reference signal resources, and selection criteria at the device before actual beam selection is needed. This advance preparation ensures that when beam selection occurs, the device has sufficient information to make accurate decisions without requiring additional signaling overhead.
Solution Approach 2:
The system changes parameters such as beam widths, reference signal configurations, and selection thresholds to optimize the balance between signaling overhead and decoding performance. By adjusting these parameters, the device can achieve reliable decoding with minimal signaling.
3Measurement precision
If multiple beams are evaluated for selection, then beam selection accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The patent segments the beam evaluation process into hierarchical stages: initial coarse evaluation of candidate beams followed by refined evaluation of selected candidates. This segmentation allows accurate beam selection while reducing overall processing time by avoiding exhaustive evaluation of all possible beams.
Solution Approach 2:
The device performs partial evaluation by focusing computational resources on evaluating only the most promising candidate beams rather than exhaustively evaluating all beams. This selective evaluation achieves sufficient accuracy while significantly reducing processing time and complexity.
Data Source
AI summary
Wireless communications are described. A wireless device and/or a base station may determine/select one or more beams for transmission of signals (e.g., sounding reference signals, SRSs) in one or more cells. The wireless device and/or the base station may determine/select a beam based on one or more of: cell indicators of a first cell and/or a second cell, antenna panel indicators associated with SRS transmissions, priorities of SRS transmissions, resource set indicators corresponding to the SRS transmissions, and/or other information.