Two-Step RACH PUCCH Parameter Determination
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Solution Overview
Problem
Current wireless communication technologies, such as 5G NR and LTE, face challenges in improving the reliability of message decoding and reducing complexity in the two-step random access channel (RACH) procedure, particularly in transmitting a physical uplink control channel (PUCCH) for acknowledging a second message transmission.
Innovation Solution
The method involves transmitting a preamble sequence and a physical uplink shared channel (PUSCH) in a first transmission of a two-step RACH procedure, detecting a physical downlink control channel (PDCCH) in a second transmission to determine spatial domain transmission filter parameters, numerology, bandwidth part (BWP), or waveform for the PUCCH, and using these determined parameters for acknowledgment feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors for PDCCH transmission in the second transmission of two-step RACH procedure, then the reliability of message decoding is improved, but the complexity of blind decoding increases
Solution Approach 1:
The patent applies preliminary action by determining PUCCH transmission parameters (spatial domain filter, numerology, BWP, waveform) based on parameters from the first transmission (preamble sequence and PUSCH) before the actual PUCCH transmission occurs. This pre-determination reduces the complexity of blind decoding during the second transmission while maintaining reliable message decoding, as the UE already has the necessary parameters configured from the initial transmission phase.
2Adaptability or versatility
If the UE determines multiple PUCCH transmission parameters (spatial domain filter, numerology, BWP, waveform), then the adaptability of the communication system is improved, but the device complexity increases
Solution Approach 1:
The patent determines multiple PUCCH transmission parameters (spatial domain filter, numerology, BWP, waveform) in advance during the first transmission phase, before the second transmission occurs. This preliminary determination allows the system to adapt to different channel conditions and requirements while reducing the complexity during actual operation, as the parameters are already configured and ready for use.
Solution Approach 2:
The patent utilizes parameter changes by allowing the PUCCH transmission parameters to be determined based on the first transmission parameters and then applied in the second transmission. This enables the system to adapt to varying channel conditions, interference levels, and quality requirements by selecting appropriate parameter combinations (different spatial filters, numerologies, BWPs, or waveforms) without requiring complex real-time decision-making during the critical second transmission phase.
Data Source
AI summary
Certain aspects of the present disclosure relate to wireless communications, and more particularly, to transmission of a physical uplink control channel (PUCCH) transmission to acknowledge a second message of a two-step random access channel (RACH) procedure.