Cross-SSB Multi-PRACH Configuration for Uplink Coverage
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Solution Overview
Problem
Poor uplink coverage in communication systems is exacerbated by limitations in Physical Random Access Channel (PRACH) channel performance, particularly due to the inability of terminal devices to perform multiple PRACH transmissions, which affects communication quality between terminal devices and network side devices.
Innovation Solution
A method and apparatus for supporting a multi-PRACH transmission configuration across Synchronization Signal Blocks (SSBs), enabling terminal devices to transmit multiple PRACHs through specified SSB usage modes, including configurations for both Contention-Free Random Access (CFRA) and Contention-Based Random Access (CBRA), with options for same or different SSBs and with or without gaps between transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices are limited to single PRACH transmission, then device complexity is reduced, but uplink coverage and reliability deteriorate
Solution Approach 1:
The patent segments the PRACH transmission process by introducing distinct SSB usage modes (first mode for same SSB, second mode for different SSBs) and separating configuration parameters (time domain, frequency domain, beam domain). This allows the system to achieve multi-PRACH transmission capability while managing complexity through structured segmentation of transmission opportunities and configuration elements.
Solution Approach 2:
The patent implements dynamic adaptability by allowing terminal devices to flexibly select between different SSB usage modes based on network configuration and channel conditions. The network can dynamically configure time domain, frequency domain, and beam domain parameters, enabling the system to adapt transmission strategies to varying uplink coverage requirements without fixing the terminal device architecture.
2Reliability
If multiple PRACH transmissions are enabled, then random access success probability improves, but transmission configuration complexity increases
Solution Approach 1:
The patent divides the multi-PRACH transmission configuration into manageable segments: SSB usage modes (first and second modes), time domain parameters, frequency domain parameters, and beam domain parameters. Each segment can be independently configured and managed, reducing overall configuration complexity while enabling multiple transmission opportunities for improved random access success.
Solution Approach 2:
The patent achieves multiple PRACH transmissions by changing and configuring multiple parameters including time domain parameters (transmission timing, periodicity), frequency domain parameters (resource allocation), and beam domain parameters (SSB associations). These parameter changes enable flexible multi-PRACH transmission strategies without requiring fundamental changes to terminal device architecture.
3Reliability
If cross-SSB PRACH transmission is supported, then uplink coverage is enhanced, but system complexity increases
Solution Approach 1:
The patent introduces a second SSB usage mode that specifically enables cross-SSB PRACH transmissions, segmenting the functionality from same-SSB transmissions (first mode). This segmentation allows the system to support cross-SSB operations for enhanced uplink coverage while maintaining simpler same-SSB operations, and managing complexity through mode-based separation of transmission scenarios.
Solution Approach 2:
The patent creates a universal PRACH transmission framework that can handle both same-SSB and cross-SSB scenarios through a unified configuration approach. The network can configure time domain, frequency domain, and beam domain parameters that apply universally across different SSB usage modes, allowing the same configuration mechanism to support both enhanced coverage (cross-SSB) and simpler operations (same-SSB).
Data Source
AI summary
The present disclosure belongs to the technical field of communications, Provided are cross-SSB-supporting multi-PRACH transmission configuration methods and apparatuses, and a device and a storage medium. A cross-SSB-supporting multi-PRACH transmission configuration method includes: sending a multi-PRACH transmission configuration to a terminal device, wherein the multi-PRACH transmission configuration is used for indicating an SSB usage mode corresponding to PRACH resources, which are used by the terminal device to send a plurality of PRACH transmissions according to the multi-PRACH transmission configuration; and receiving a plurality of PRACHs, which are transmitted on the PRACH resources by the terminal device by means of the SSB usage mode.