Random Access Method for Multi-Beam Uplink Resource Optimization
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Solution Overview
Problem
In a multi-beam scenario of communication technologies, UEs without Transmission-Reception (Tx-Rx) correspondence ability face challenges in determining their uplink beam, leading to inefficient random access procedures and increased resource consumption.
Innovation Solution
A random access method that involves acquiring a Physical Random Access Channel (PRACH) resource for multi-preamble transmission from the associated downlink beam, allowing preamble transmission to start from any time-frequency resource position within the multi-preamble transmission opportunity, and monitoring the Random Access Response (RAR) receiving window only after all preambles are transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE without Tx-Rx correspondence ability sends multiple preambles to ensure base station receives a preamble, then random access reliability is improved, but resource consumption increases
Solution Approach 1:
The patent segments the random access process into two independent parts: preamble transmission (Msg1) and RAR window monitoring. By separating these functions and allowing the UE to stop monitoring after successful preamble transmission, the system maintains access reliability while reducing resource consumption during the monitoring phase.
Solution Approach 2:
The patent applies preliminary action by having the UE transmit multiple preambles before the RAR window monitoring phase. This ensures that at least one preamble is successfully received by the base station before the UE needs to monitor for Random Access Responses, thereby guaranteeing access reliability without requiring continuous monitoring throughout the entire process.
2Speed
If UE monitors RAR receiving window after each preamble transmission, then random access responsiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the RAR window monitoring function into a single phase that occurs after all preamble transmissions are completed. This consolidation reduces the number of times the UE needs to monitor and manage RAR windows, thereby reducing monitoring complexity while still ensuring responsive random access through proper timing of the single monitoring phase.
3Adaptability or versatility
If UE transmits preambles from any time-frequency resource position, then random access flexibility is improved, but synchronization requirements increase
Solution Approach 1:
The patent uses feedback mechanisms where the base station provides timing information about received preambles and corresponding RAR windows. This feedback allows UEs to adjust their transmission timing and synchronization requirements, maintaining flexibility in choosing time-frequency resource positions while managing synchronization precision through adaptive timing based on base station feedback.
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3~4
AI summary
Disclosed are a random access method and device, user equipment, a base station, and a computer readable storage medium. The random access method comprises: obtaining a PRACH resource transmitted by a multi-preamble sequence from a currently associated downlink beam when random access is initiated, the PRACH resource being used for indicating a multi-preamble transmission opportunity; starting to transmit the preamble from any time-frequency resource position at which the multi-preamble transmission opportunity is currently located, and starting to monitor an RAR receiving window at the end of all preamble transmissions; if an RAR is received in the RAR receiving window, determining a sending beam responded by the RAR, sending an MSG3 to the base station by means of the sending beam, and waiting to receive an MSG4 returned by the base station. According to embodiments of the present invention, starting to monitor the RAR receiving window at the end of all preamble transmissions can reduce resource consumption.