Dynamic Waveform Switching for Msg3 PUSCH in 5G NR
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing the waveform for the third random access message (Msg3) physical uplink shared channel (PUSCH) transmission during the initial access procedure, which affects coverage and efficiency.
Innovation Solution
The method involves dynamic waveform switching for the Msg3 PUSCH transmission, where the base station transmits a second random access message (Msg2) with an indication of the waveform for the Msg3 PUSCH, and the user equipment (UE) performs the switching accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed waveform is used for Msg3 PUSCH transmission, then the system complexity is reduced, but the coverage and communication efficiency are limited
Solution Approach 1:
The patent implements dynamic waveform switching for Msg3 PUSCH transmission, where the waveform type (CP-OFDM or DFT-s-OFDM) is selected based on real-time channel conditions and UE capabilities. The base station configures multiple waveform options and dynamically indicates which waveform to use through DCI formatting, allowing the system to adapt to varying coverage requirements while maintaining manageable complexity through standardized procedures.
Solution Approach 2:
The patent changes the waveform parameter (cyclic prefix OFDM vs. DFT spread OFDM) based on transmission requirements. By modifying this fundamental signal characteristic dynamically, the system can optimize coverage for cell-edge users using DFT-s-OFDM while maintaining efficiency for other users with CP-OFDM, thereby improving overall reliability without requiring a complete system redesign.
2Productivity
If dynamic waveform switching is implemented for Msg3 PUSCH, then the coverage and efficiency are improved, but the signaling overhead increases
Solution Approach 1:
The patent makes the existing DCI format 1_0 multi-functional by extending it to carry waveform indication information in addition to its traditional scheduling functions. This allows the same downlink control message to simultaneously provide resource allocation and waveform selection instructions, eliminating the need for separate signaling messages and reducing overall overhead while enabling dynamic waveform switching for improved productivity.
Solution Approach 2:
The patent merges the waveform indication function with the existing random access response and scheduling DCI messages. By combining multiple control functions into a single signaling structure, the patent reduces the total amount of signaling overhead required to implement dynamic waveform switching, as the waveform selection information is integrated into messages that are already being transmitted for other purposes.
Data Source
AI summary
A base station and a user equipment (UE) may be configured to perform a dynamic waveform switching for a third random access message (Msg3) physical uplink shared channel (PUSCH) transmission during an initial access procedure. The base station may transmit a second random access message (Msg2) including an indication of a waveform for the Msg3 PUSCH transmission. The UE may receive the Msg2 including indication of the waveform for the Msg3 PUSCH transmission, and the UE may perform a dynamic waveform switching in response to the received indication of the waveform for the Msg3 PUSCH transmission by transmitting the Msg3 PUSCH based on the indication of the waveform received from the base station.