Msg3 PUSCH Repeated Transmission Control in NR Random Access
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Solution Overview
Problem
In new radio (NR) systems, the four-step random access procedure faces challenges in improving coverage performance for message 3 (Msg3) physical uplink shared channel (PUSCH) and physical random access channel (PRACH) due to limited repeated transmission mechanisms.
Innovation Solution
A wireless communication method is introduced, where a terminal device determines the interpretation mode for the modulation and coding scheme (MCS) information field and decides on repeated transmissions of Msg3 PUSCH based on information related to repeated transmissions of PRACH, and a network device determines information carried in the MCS field and applies the random access procedure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repeated transmissions of Msg3 PUSCH and PRACH are introduced to improve coverage performance, then coverage performance is improved, but device complexity and protocol complexity increase
Solution Approach 1:
The patent combines the determination of repeated transmission applicability for both Msg3 PUSCH and PRACH into a unified decision process. The terminal device determines whether repeated transmissions are applicable based on common criteria (downlink signal quality, network configuration), and the network device applies consistent control mechanisms for both channels, reducing overall protocol complexity while maintaining improved coverage performance.
Solution Approach 2:
The patent utilizes dynamic parameter adjustment where the network device configures different repetition numbers for Msg3 PUSCH and PRACH based on channel conditions and requirements. The terminal device adjusts transmission parameters such as power, timing, and resource allocation according to the determined repetition mode, enabling flexible adaptation to various coverage scenarios without fixed complex procedures.
2Reliability
If repeated transmissions are implemented to enhance coverage, then transmission reliability improves, but time consumption increases
Solution Approach 1:
The patent implements dynamic determination of repeated transmission modes where the terminal device and network device continuously assess channel conditions and transmission requirements. The repetition number and transmission timing are adjusted dynamically based on real-time feedback, allowing the system to optimize between reliability improvement and time consumption rather than using fixed repeated transmission patterns.
Solution Approach 2:
The network device performs preliminary configuration and indication before the actual transmission, specifying whether repeated transmissions are needed and under what conditions. This advance preparation allows the terminal device to prepare transmission resources and timing accordingly, reducing overall time consumption compared to reactive repeated transmission approaches.
3Reliability
If the MCS information field interpretation mode is optimized based on PRACH repeated transmission information, then coverage performance improves, but information processing complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the terminal device reports information about PRACH repeated transmission status and channel conditions to the network device. This feedback enables the network device to optimize the MCS information field interpretation mode dynamically, adjusting modulation and coding parameters based on actual transmission conditions rather than using fixed interpretation rules, thereby improving coverage while managing processing complexity through targeted adjustments.
Solution Approach 2:
The patent segments the information processing into distinct determination steps: first determining whether repeated transmissions are applicable based on channel conditions, then determining the specific interpretation mode for MCS information field based on the repetition status. This segmentation of processing tasks reduces overall complexity by handling information processing in manageable stages rather than as a single complex operation.
Data Source
AI summary
A wireless communication method includes: determining, by a terminal device according to first information, an interpretation mode of a target modulation and coding scheme (MCS) information field and/or whether a random access procedure is applicable to repeated transmissions of a first physical uplink shared channel (PUSCH), where the first PUSCH is used to carry message 3 in the random access procedure, and the first information is related to repeated transmissions of a physical random access channel (PRACH) in the random access procedure.