Uplink Waveform Indication for Dynamic SFN and TDM Switching
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Solution Overview
Problem
Existing uplink transmission methods in coordinated multi-point systems face challenges with high transmission delay and require simultaneous transmission capabilities across multiple TRPs, necessitating improved multiplexing modes and dynamic switching of uplink waveforms.
Innovation Solution
Enhancing the downlink control information (DCI) with a first indication field to support simultaneous transmission of uplink waveforms, allowing dynamic switching between CP-OFDM and DFT-S-OFDM in a multi-panel scenario, thereby enabling efficient and reliable uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If TDM transmission mode is used for uplink coordinated multi-point transmission, then transmission delay is reduced, but simultaneous transmission capability across multiple TRPs is lost
Solution Approach 1:
The patent implements dynamic switching between TDM transmission mode and SFN transmission mode based on real-time channel conditions and service requirements. The network can dynamically select the appropriate transmission mode for different uplink transmissions, allowing the system to adapt between low-latency scenarios (TDM) and simultaneous multi-TRP coverage scenarios (SFN), thereby resolving the contradiction between transmission delay and simultaneous transmission capability.
2Adaptability or versatility
If SFN transmission mode is used for uplink coordinated multi-point transmission, then simultaneous transmission across multiple TRPs is achieved, but transmission delay increases
Solution Approach 1:
The patent implements dynamic switching between TDM transmission mode and SFN transmission mode based on real-time channel conditions and service requirements. The network can dynamically select the appropriate transmission mode for different uplink transmissions, allowing the system to adapt between low-latency scenarios (TDM) and simultaneous multi-TRP coverage scenarios (SFN), thereby resolving the contradiction between transmission delay and simultaneous transmission capability.
3Device complexity
If fixed uplink waveform is used, then device complexity is reduced, but adaptability to different transmission scenarios is limited
Solution Approach 1:
The patent introduces dynamic waveform switching capability where the terminal can switch between CP-OFDM and DFT-S-OFDM waveforms based on DCI indications from the network. This dynamic approach allows the system to adapt to different transmission scenarios (single-TRP, multi-TRP, SFN, TDM) without permanently increasing device complexity, as the switching logic is triggered only when needed.
Solution Approach 2:
The patent changes the waveform parameter dynamically based on transmission requirements. By using DCI to indicate waveform type, the system can adjust the uplink waveform parameter (CP-OFDM or DFT-S-OFDM) according to channel conditions, service type, and transmission mode, thereby improving adaptability without requiring complex permanent configuration.
4Adaptability or versatility
If multi-panel transmission is implemented, then simultaneous transmission to multiple TRPs is achieved, but device complexity increases
Solution Approach 1:
The patent uses DCI as an intermediary to coordinate multi-panel transmission. Instead of requiring complex terminal-side coordination logic, the network device sends DCI indications that tell the terminal which panels to use and what waveform to apply for each TRP. This intermediary control mechanism simplifies terminal complexity while enabling sophisticated multi-panel transmission capabilities.
Data Source
AI summary
A method for indicating an uplink waveform, including: a terminal receives downlink control information (DCI) carrying a first indication domain, where all or a portion of codepoints in the first indication field is configured to indicate an uplink waveform of the terminal using single-frequency network (SFN) transmission.