Random Access Preamble Transmission via SSB-Linked RACH Resources
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Solution Overview
Problem
The increasing number of user equipment (UEs) and data/control information to be transmitted by base stations (BSs) in wireless communication systems poses challenges in efficiently using limited radio resources, particularly in reducing latency and supporting new radio access technologies.
Innovation Solution
A method and apparatus for transmitting and receiving random access signals, where a user equipment (UE) transmits a random access preamble on a random access channel resource associated with a synchronization signal block, and the BS responds with a random access response, including aperiodic CSI-RS transmission to enable efficient beam reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of user equipments and data/control information increases, then communication capacity requirements increase, but radio resources become more limited and latency increases
Solution Approach 1:
The patent segments the random access procedure into distinct phases with specific beam management operations. The RACH procedure is divided into preamble transmission, RAR reception, and beam reporting phases, allowing parallel processing of beam management and random access functions. This segmentation enables the system to handle multiple UEs simultaneously without increasing overall latency.
Solution Approach 2:
The patent performs preliminary beam management actions during the random access procedure. The base station transmits SSBs and associated RACH resources are prepared in advance, and beam reporting configurations are pre-established. This preliminary preparation allows the system to quickly respond to RACH preambles without additional beam management delays.
2Productivity
If new radio access technology is introduced to improve communication efficiency, then system performance improves, but device complexity and implementation cost increase
Solution Approach 1:
The patent implements a universal beam management approach that works across different radio access technologies. The same SSB-based beam management mechanism is used for both legacy and new radio systems. The base station can serve multiple types of UEs using the same beamforming and RACH resources, reducing the need for separate implementation paths and lowering overall system complexity.
Solution Approach 2:
The system enables UEs to self-determine the appropriate SSB and corresponding RACH resources based on downlink beam quality measurements. The UE autonomously selects beams and configures its uplink transmission parameters without requiring complex network coordination. This self-service capability reduces network control overhead and simplifies base station implementation.
3Productivity
If beam reporting is enhanced during random access procedure, then uplink/downlink signal transmission efficiency improves, but processing requirements and system overhead increase
Solution Approach 1:
The patent merges beam reporting with the existing random access response procedure. The UE includes beam quality information in the RAR message, combining two functions (random access confirmation and beam reporting) into a single message exchange. This merging eliminates the need for separate beam reporting messages and reduces processing overhead compared to independent beam management procedures.
Data Source
AI summary
Disclosed herein are a method and apparatus for transmitting/receiving random access signals. A user equipment (UE) transmits a random access preamble of a random access procedure through a random access channel (RACH) resource associated with a synchronization signal (SS) block. A base station (BS) receiving the random access preamble from a UE can transmit CSI-RSs to the UE. The BS may inform the UE that there will be CSI-RS transmission to the UE, during the random access procedure.