Dynamic Transform Precoding Indication for Uplink Coverage
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Solution Overview
Problem
The challenge in next-generation wireless communication systems, such as 5G NR, is to maintain adequate uplink coverage, especially in scenarios where higher carrier frequencies are used, leading to increased path-loss and reduced quality of service.
Innovation Solution
The implementation of dynamic transform precoding indication for physical uplink shared channel (PUSCH) transmission and msg3 transmission associated with the random access channel (RACH) procedure. This involves using downlink control information (DCI) to indicate whether transform precoding is enabled or disabled, allowing for dynamic waveform selection between CP-OFDM and DFT-s-OFDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher carrier frequencies are used in NR systems, then data rate and spectral efficiency are improved, but path-loss increases and uplink coverage deteriorates
Solution Approach 1:
The patent applies dynamics by enabling dynamic transform precoding indication through DCI signaling, allowing the system to switch between CP-OFDM and DFT-s-OFDM waveforms based on real-time channel conditions. This dynamic adaptation enables the system to maintain high data rates when conditions permit while switching to lower-PAPR waveforms when coverage is critical, thus resolving the contradiction between productivity and reliability.
Solution Approach 2:
The patent changes the waveform parameter (transform precoding enable/disable) to resolve the contradiction. By modifying the operational parameter of transform precoding based on channel conditions, the system can switch between waveforms with different PAPR characteristics, thereby adapting to varying coverage requirements while maintaining high spectral efficiency when possible.
2Reliability
If transform precoding is enabled for PUSCH transmission, then uplink coverage is improved through lower PAPR, but waveform flexibility is reduced
Solution Approach 1:
The patent resolves this contradiction through dynamic waveform selection. Instead of being fixed to one waveform, the system can dynamically switch between CP-OFDM and DFT-s-OFDM based on channel conditions. The transform precoding indication in DCI enables the UE to adapt its waveform choice, maintaining waveform flexibility while being able to leverage lower-PAPR benefits when needed.
Solution Approach 2:
The patent makes the waveform selection mechanism universal by allowing the same PUSCH transmission framework to support multiple waveform types (CP-OFDM and DFT-s-OFDM) through a single unified approach. The transform precoding indication mechanism serves multiple purposes: enabling coverage enhancement when needed while preserving the option to use standard CP-OFDM when flexibility is prioritized.
3Reliability
If dynamic transform precoding indication is implemented, then uplink coverage is enhanced, but DCI structure complexity increases
Solution Approach 1:
The patent merges the transform precoding indication with existing DCI fields rather than adding a completely separate structure. By integrating the indication into the existing DCI framework (using existing fields or combining with other control parameters), the patent achieves coverage enhancement while minimizing the increase in overall DCI structure complexity.
Solution Approach 2:
The patent changes existing DCI parameters or uses existing fields to carry the transform precoding indication, rather than creating entirely new structural elements. This parameter-based approach allows for coverage enhancement while keeping the DCI structure relatively simple and compatible with existing implementation frameworks.
Data Source
AI summary
Various embodiments herein provide techniques for dynamic transform precoding indication for a physical uplink shared channel (PUSCH) transmission and/or a msg3 transmission associated with a random access channel (RACH) procedure. For example, a downlink control information (DCI) that schedules a PUSCH may include a field to indicate whether transform precoding is enabled or disabled for the PUSCH. Additionally, or alternatively, the uplink grant received in the msg2 of the RACH procedure may include an indication of whether transform precoding is enabled or disabled for the msg3. Other embodiments may be described and claimed.