Uplink Shared Channel DMRS Multiplexing Across UCI and Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently multiplexing demodulation reference signals (DMRS) with uplink control information (UCI) and uplink shared channel data (UL-SCH) on uplink shared channels, leading to suboptimal resource utilization and waveform properties.
Innovation Solution
The UE determines a mapping that time division multiplexes (TDM) DMRS with UCI and/or UL-SCH data in different symbol periods and can frequency division multiplex (FDM) them based on the waveform type, using downlink control information (DCI) or radio resource control (RRC) signaling to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMRS is frequency division multiplexed with UCI and UL-SCH data in the same symbol period, then resource utilization is improved, but waveform properties deteriorate
Solution Approach 1:
The patent implements dynamic multiplexing mode selection where the UE can switch between FDM and TDM modes based on waveform type. For DFT-S-OFDM waveforms, TDM mode is used to maintain single-carrier properties, while for CP-OFDM waveforms, FDM mode can be used to improve resource utilization. This dynamic adaptation resolves the contradiction by allowing the system to optimize for either resource efficiency or waveform integrity depending on requirements.
Solution Approach 2:
The patent changes the multiplexing parameter (FDM vs TDM) based on the waveform type parameter. When the waveform type is DFT-S-OFDM, the multiplexing parameter is set to TDM to preserve single-carrier properties. When the waveform type is CP-OFDM, the multiplexing parameter can be set to FDM to maximize resource utilization. This parameter-based control resolves the technical contradiction.
2Reliability
If DMRS is time division multiplexed with UCI and UL-SCH data in different symbol periods, then waveform properties are maintained, but resource utilization deteriorates
Solution Approach 1:
The system dynamically selects between TDM and FDM modes based on the waveform type. For DFT-S-OFDM where waveform integrity is critical, TDM is applied to maintain single-carrier properties. For CP-OFDM where resource efficiency is prioritized, FDM is applied to improve utilization. This dynamic selection resolves the contradiction contextually.
Solution Approach 2:
The multiplexing mode parameter is changed according to the waveform type parameter. When waveform type indicates DFT-S-OFDM, the multiplexing parameter is set to TDM to preserve waveform properties. When waveform type indicates CP-OFDM, the multiplexing parameter is set to FDM to improve resource utilization. This parameter coupling resolves the technical contradiction.
3Adaptability or versatility
If flexible multiplexing options are provided for different waveform types, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent uses parameter-based control where the waveform type parameter directly determines the multiplexing mode parameter. This simple parameter coupling provides flexible adaptability across different waveform types without requiring complex decision logic, thereby resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent creates a universal multiplexing framework that works across different waveform types (DFT-S-OFDM and CP-OFDM) by providing standardized TDM and FDM modes. This multi-functional approach allows the same multiplexing mechanism to serve different waveform requirements, improving adaptability while maintaining manageable complexity through a unified design.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for controlling multiplexing of a reference signal on an uplink shared channel (UL-SCH). In an implementation, a user equipment (UE) may time division multiplex (TDM) a demodulation reference signal (DMRS) with other signaling across symbol periods of one or more allocated resource blocks. The UE may map the DMRS to resource elements of one or more symbol periods within the allocated resource blocks. The UE may then map uplink control information (UCI) to one or more symbol periods different than the symbol periods of the DMRS mapping. In some cases, the DMRS, UCI, or both may be frequency interleaved with UL-SCH data for the allocated resource blocks. The UE may generate and transmit an uplink waveform for transmission within the allocated resources of the uplink shared channel.