Beam Indication During Random Access Procedures
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Solution Overview
Problem
In wireless communications, during random access procedures, base stations often face challenges in scheduling downlink communications due to resource unavailability, leading to increased system latency, communication delays, and decreased user experience, especially when preferred beams are not available or overloaded.
Innovation Solution
User equipment (UE) transmits indications of multiple candidate beams that satisfy a channel quality threshold, allowing the base station to flexibly select a suitable beam for communication, thereby reducing system latency and congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE transmits random access messages on multiple PRACH resources associated with different candidate beams, then the base station has more flexible beam selection options, but the device complexity and processing overhead increase
Solution Approach 1:
The patent segments the beam indication process by allowing the UE to transmit multiple random access messages on different PRACH resources, each associated with a specific candidate beam. This segmentation enables the base station to receive and process beam indications separately for each beam, facilitating flexible beam selection while maintaining manageable processing complexity through structured message transmission.
Solution Approach 2:
The patent introduces a spatial dimension to beam selection by enabling the UE to indicate multiple candidate beams simultaneously through transmissions on different PRACH resources. This dimensional approach allows the base station to consider multiple spatial directions (beams) when selecting the optimal beam for communication, enhancing adaptability without requiring complex processing of a single overloaded beam.
2Reliability
If the base station schedules downlink communications on a preferred beam, then communication quality is optimized, but system latency increases when the preferred beam is unavailable or overloaded
Solution Approach 1:
The patent applies preliminary action by having the UE indicate multiple candidate beams in advance during the random access procedure. This allows the base station to prepare and schedule downlink communications on alternative beams before the preferred beam becomes unavailable or overloaded, reducing system latency by avoiding last-minute beam switching delays.
Solution Approach 2:
The patent implements feedback mechanisms where the UE provides beam quality information and availability status to the base station during random access. This feedback enables the base station to make informed scheduling decisions, selecting beams that are both high-quality and currently available, thereby optimizing communication quality while minimizing latency through proactive beam selection.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may monitor multiple synchronization signal resources, each synchronization signal resource associated with a beam of a set of beams and may determine that multiple candidate beams of the set of beams satisfy a channel quality threshold. The UE may transmit an indication that the multiple candidate beams satisfy the channel quality threshold. For example, the UE may transmit a single random access message on a physical random access channel (PRACH) resource associated with multiple candidate beams, or may transmit multiple random access messages, each one on a different PRACH resource associated with a different candidate beam. The UE may receive an indication of one of the candidate beams from the base station and may establish a connection with the base station using the indicated candidate beam.