Dynamic Waveform Determination for Uplink PUSCH Transmissions
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmissions due to the increasing demand for wireless data traffic, particularly in 5G communication systems, where existing methods for waveform determination are not optimized for varying channel conditions and coverage areas.
Innovation Solution
The implementation of a user equipment (UE) and base station (BS) system that determines the waveform for physical uplink shared channels (PUSCH) based on an indication in the downlink control information (DCI) format, allowing for dynamic switching between CP-OFDM and DFT-S-OFDM waveforms, enabling adaptive precoding and resource allocation to enhance connectivity and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transform precoding is enabled for PUSCH transmissions, then coverage and link reliability are improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The system dynamically switches between transform precoding enabled and disabled modes based on DCI indications and higher layer configurations. The UE adjusts its processing mode according to real-time scheduling decisions, enabling transform precoding when coverage is critical and disabling it when simplicity is preferred, thus resolving the contradiction between reliability improvement and processing complexity
Solution Approach 2:
The patent changes the operational parameter of transform precoding from a fixed state to a dynamic state that can be enabled or disabled based on scheduling information. By modifying this parameter according to DCI format indications and TPI fields, the system optimizes the balance between link reliability and processing complexity for different transmission scenarios
2Adaptability or versatility
If dynamic waveform switching between CP-OFDM and DFT-S-OFDM is implemented, then adaptability to varying channel conditions is improved, but device complexity increases due to multiple waveform handling requirements
Solution Approach 1:
The system implements dynamic waveform selection where the UE switches between CP-OFDM and DFT-S-OFDM waveforms based on real-time DCI indications. The waveform mode is dynamically adjusted according to channel conditions and scheduling decisions, enabling the system to adapt to varying coverage scenarios while managing complexity through structured switching logic
Solution Approach 2:
The UE is designed to handle multiple waveform types (CP-OFDM and DFT-S-OFDM) within a unified processing framework. The device maintains the capability to process both waveform types using common processing resources, reducing the actual complexity increase while achieving multi-waveform support for different channel conditions
3Measurement precision
If TPI field is added to DCI format for waveform indication, then waveform determination accuracy is improved, but message size and processing overhead increase
Solution Approach 1:
The TPI field is selectively added to DCI format only when waveform indication is required, rather than being present in all DCI formats. The field is conditionally included based on the specific scheduling scenario and waveform configuration, providing precise waveform determination when needed while minimizing overhead in cases where the waveform can be determined from existing DCI fields
Data Source
AI summary
Apparatuses and methods for waveform determination for uplink (UL) transmissions. A method includes receiving first information indicating whether transform precoding is enabled or disabled, second information indicating a presence of a transform precoder indication (TPI) field in a downlink control information (DCI) format, third information for a configuration related to a resource allocation associated with transmissions of physical uplink shared channels (PUSCHs) with transform precoding disabled, and a channel providing the DCI format that schedules a transmission of a PUSCH. The method further includes determining whether the transform precoding is enabled based on the TPI field, that the configuration is used when transform precoding is disabled, and that the configuration is not used when transform precoding is enabled. The method further includes transmitting the PUSCH with transform precoding and without the configuration, when transform precoding is enabled, or without transform precoding and with the configuration, when transform precoding is disabled.