MsgA PUSCH Resource Allocation for NTN Uplink Coverage
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Solution Overview
Problem
Current wireless communication systems face challenges in implementing effective uplink coverage enhancement during the 2-step random access procedure in wireless communication systems, particularly in non-terrestrial network (NTN) communication systems, where terminal devices struggle to maintain reliable connections due to limited resource allocation and interference.
Innovation Solution
The proposed solution involves determining a first random access request message (MsgA) physical uplink shared channel (PUSCH) resource set and repetition number, as well as a physical uplink control channel (PUCCH) repetition number for hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback information, to optimize resource utilization and enhance coverage in the 2-step random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink coverage enhancement is implemented in 2-step random access procedure, then transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The PUSCH resource set is segmented into multiple PUSCH occasions (POs) in the time domain, where each PO corresponds to one DMRS resource or one DMRS resource set. This segmentation allows the terminal to select specific POs for transmission based on coverage enhancement requirements, thereby improving transmission reliability while maintaining manageable resource allocation through structured division of resources.
2Reliability
If MsgA PUSCH repetition number is increased, then uplink coverage is enhanced, but time resource consumption increases
Solution Approach 1:
The solution employs periodic repetition of MsgA PUSCH transmissions across multiple POs, where the repetition number is determined based on coverage requirements. The periodic structure allows the system to achieve coverage enhancement through repeated transmissions while efficiently utilizing time resources by spacing repetitions across different POs rather than continuous transmission.
Solution Approach 2:
The MsgA PUSCH repetition number is dynamically determined based on the first MsgA PUSCH resource set configuration and coverage requirements. The terminal can adaptively select the appropriate number of repetitions and corresponding POs, allowing flexible adjustment between coverage enhancement and time resource consumption based on actual channel conditions.
3Reliability
If PUCCH repetition number for HARQ-ACK feedback is increased, then feedback reliability is improved, but control channel resource consumption increases
Solution Approach 1:
The PUCCH resources are segmented into multiple repetitions, where the terminal determines the first repetition number of PUCCH based on HARQ-ACK feedback requirements. This segmentation allows reliable feedback transmission through repetition while efficiently managing control channel resources by using only the necessary number of repetitions rather than continuous occupation.
4Productivity
If resource allocation is optimized for coverage enhancement, then transmission efficiency is improved, but system adaptability decreases
Solution Approach 1:
The MsgA PUSCH resource set configuration with multiple POs and DMRS resources serves multiple functions: it supports both coverage enhancement through repetition and efficient transmission when coverage is not an issue. The same resource set structure adapts to different channel conditions by allowing the terminal to select appropriate POs and repetition numbers, thereby maintaining both transmission efficiency and system adaptability.
Data Source
AI summary
A communication method and apparatus, and a terminal device are provided. The method includes the following. Determine a first random access request message (message A, MsgA) physical uplink shared channel (PUSCH) resource set and a first repetition number of MsgA PUSCH, where the first MsgA PUSCH resource set corresponds to R PUSCH occasions (PO) in time domain and one demodulation reference signal (DMRS) resource or one DMRS resource set. Determine a PO from the first MsgA PUSCH resource set according to the first repetition number of MsgA PUSCH to perform MsgA PUSCH transmission.