Flexible Waveform Configuration for Autonomous Uplink Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reducing the number of handshake messages during random access procedures, leading to potential delays in channel access, especially in contention-based scenarios.
Innovation Solution
The implementation of flexible waveform configuration for autonomous uplink transmissions, where user equipment (UE) can autonomously transmit initial random access messages based on a waveform configuration indicated by broadcast signaling from the base station, allowing for dynamic selection of waveform types such as CP-OFDM and DFT-s-OFDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional multi-step random access procedure is used, then connection establishment reliability is improved, but channel access delay increases
Solution Approach 1:
The patent combines multiple random access messages into a single uplink transmission. Specifically, Message A (MsgA) integrates the random access preamble and uplink data transmission into one autonomous uplink message, eliminating the need for separate message exchanges and reducing overall access delay while maintaining connection reliability
Solution Approach 2:
The patent enables preliminary autonomous uplink transmission by allowing the UE to send MsgA without waiting for explicit uplink grants. This preliminary action bypasses traditional scheduling delays and enables faster channel access while the base station processes the autonomous transmission for reliable connection establishment
2Productivity
If autonomous uplink transmission is implemented, then message exchange overhead is reduced, but waveform configuration complexity increases
Solution Approach 1:
The patent manages waveform configuration complexity by dynamically changing waveform parameters based on transmission conditions. The system selects between DFT-s-OFDM and CP-OFDM waveforms depending on autonomous uplink configuration, adapting parameters like cyclic prefix length and modulation schemes to balance message exchange efficiency with configuration manageability
3Adaptability or versatility
If flexible waveform selection is enabled, then communication scenario adaptability is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic waveform selection where the UE can adapt between different waveform types (DFT-s-OFDM, CP-OFDM) based on autonomous uplink configuration and transmission scenarios. This dynamic approach improves communication adaptability across different conditions while the base station manages the complexity through centralized waveform configuration and indication
Data Source
AI summary
Wireless communications systems may support flexible waveform configuration for autonomous uplink transmissions. A base station may transmit broadcast signaling (e.g., a system information block (SIB)) indicating waveform configuration information for an autonomous uplink transmission by a user equipment (UE). In some cases, the broadcast signaling may include a waveform configuration field (WCF) that may indicate whether flexible waveforms for autonomous uplink are supported, may configure a waveform type, may indicate waveform configuration mapping rules, etc. As such, a UE may identify whether flexible waveform configuration for autonomous uplink is supported, and may determine waveform types for autonomous uplink transmissions based on waveform type configuration information from a base station (e.g., which may include an indication of whether flexible waveform configuration is supported, an indication of waveform type/scenario mapping rules, etc.), one or more LUTs, identified autonomous uplink scenarios, autonomous uplink transmission parameters, or some combination thereof.