Downlink Waveform Switching for Adaptive Base Station Transmission
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Solution Overview
Problem
Existing wireless communication systems lack the ability to dynamically switch between different waveforms for downlink transmissions, limiting flexibility and efficiency in resource allocation and communication quality.
Innovation Solution
A network entity can send an indication to user equipment to switch between waveforms, specifying parameters such as transform precoding, DFT-S-OFDM, CP-OFDM, or OTFS for downlink transmissions, allowing dynamic adjustment based on network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single waveform type is used for downlink transmissions, then system complexity is reduced, but adaptability to different network scenarios and communication quality deteriorate
Solution Approach 1:
The patent implements dynamic waveform switching by enabling the base station to select between different waveform types (CP-OFDM and DFT-S-OFDM) based on real-time network conditions and UE characteristics. The waveform type is determined dynamically through RRC configuration and DCI indication, allowing the system to adapt to varying channel conditions, traffic types, and UE capabilities rather than using a fixed waveform approach
Solution Approach 2:
The patent changes the waveform parameter (transform precoding enablement) to switch between different transmission modes. By controlling the transform precoding parameter in the DFT-S-OFDM waveform, the system can adapt to different network scenarios such as varying channel conditions, interference levels, and traffic requirements, thereby improving communication quality through parameter optimization
2Productivity
If waveform switching is implemented, then communication efficiency is improved, but processing overhead and system complexity increase
Solution Approach 1:
The patent performs preliminary configuration of waveform switching parameters through RRC signaling before actual data transmission. The base station configures the UE with waveform switching parameters including transform precoding enablement, reference signal configurations, and antenna port information in advance, so that when waveform switching is needed, the UE is already prepared and can switch quickly without excessive processing overhead during data transmission
Solution Approach 2:
The patent introduces DCI (Downlink Control Information) as an intermediary mechanism to trigger waveform switching. The DCI format includes a transform precoding indication field that signals the UE to switch between waveform types. This intermediary approach allows efficient waveform switching by embedding the switching command in existing control signaling structures rather than requiring separate complex switching protocols
Data Source
AI summary
Aspects relate to transmission of a downlink signal. A network entity such as a base station may use different waveforms for downlink transmissions in different scenarios. In some examples, the network entity may send an indication of a waveform switch to a user equipment. In some examples, the indication may specify that a particular waveform is to be used for a downlink transmission and/or a particular waveform parameter is to be used for a downlink transmission.