Transmission Beam Indication for Wireless Initial Access
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Solution Overview
Problem
In wireless communication networks, especially at higher frequencies, the lack of TX/RX reciprocity leads to increased latency and suboptimal performance during initial access, as base stations and user equipment (UEs) struggle to determine the best transmission and reception beams, resulting in inefficient PRACH preamble transmission and reception.
Innovation Solution
The system employs multiple transmission beams and a feedback mechanism where a base unit detects and indicates the strongest transmission beam to the UE, allowing for optimized beam selection and reduced latency through resource pooling and bundling of PRACH transmission occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission beams are used for PRACH preamble transmission in higher frequency networks, then network coverage is improved, but latency increases due to beam sweeping requirements
Solution Approach 1:
The base station performs RX beam sweeping in advance during the random access procedure to identify the optimal receive beam for each UE. This preliminary beam identification allows the system to establish the best beam pair before actual data transmission begins, resolving the contradiction by preparing beam configurations proactively rather than reactively during transmission.
Solution Approach 2:
The system implements feedback mechanisms where the base station provides beam indication information to UEs based on detected PRACH preambles. This feedback enables UEs to adjust their TX beams in subsequent transmissions, creating a closed-loop system that continuously optimizes beam selection and reduces latency through iterative improvement rather than exhaustive sweeping.
2Device complexity
If TX/RX reciprocity is assumed in multiple beam systems, then device complexity is reduced, but measurement precision deteriorates due to lack of actual beam association
Solution Approach 1:
The system allows UEs to autonomously determine their optimal TX beams by monitoring feedback from the base station's RX beam sweeping process. Instead of requiring complex base station-side beam management for each UE, the UEs self-configure their transmission beams based on the base station's receive beam characteristics, distributing the complexity management and achieving accurate beam association through distributed intelligence.
3Measurement precision
If beam sweeping is performed for each PRACH transmission occasion, then beam selection accuracy is improved, but resource utilization efficiency deteriorates
Solution Approach 1:
The base station combines multiple PRACH reception opportunities into a single bundled reception process, where RX beam sweeping is performed once across multiple time instances. This merging allows the system to accumulate signal energy from multiple transmissions and identify the optimal beam pair more accurately without repeating the expensive beam sweeping process for each individual PRACH occasion, thereby improving both accuracy and efficiency.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for transmission beam indicating. One apparatus includes a transmitter that transmits information using multiple transmission beams. The apparatus also includes a receiver that receives a feedback message indicating a transmission beam of the multiple transmission beams. The feedback message is received in response to transmitting the information. The transmitter transmits a message using the transmission beam in response to receiving the feedback message.