RC UE Random Access Repetition for Reliable NR Uplink
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Solution Overview
Problem
The 3GPP NR system lacks a specific method for random access of reduced capability (RC) user equipment (UE), which includes industrial wireless sensors, video surveillance, and wearable devices, requiring a new approach for random access and uplink data channel repetition transmission.
Innovation Solution
A method and apparatus for RC UE that involves receiving random access-related configuration information, determining PRACH and PUSCH repetition transmissions, and performing PRACH and PUSCH repetition transmissions based on configured resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional random access method is used for RC UE, then device complexity is reduced, but communication reliability deteriorates due to lack of specific optimization
Solution Approach 1:
The random access procedure is segmented into distinct phases: preamble transmission phase and uplink data channel transmission phase. The preamble transmission is further divided into multiple repetition transmissions, allowing RC UE to perform simpler initial access while maintaining reliability through systematic segmentation of the access process.
Solution Approach 2:
The base station performs preliminary actions by providing dedicated random access configuration information to RC UE before the actual random access process. This includes pre-configuring repetition numbers, time resources, and frequency resources, which simplifies the UE's processing requirements while ensuring reliable communication.
2Reliability
If repetition transmission is implemented, then communication reliability is improved, but transmission time increases
Solution Approach 1:
The patent implements periodic repetition transmission where the preamble is transmitted multiple times at predetermined time intervals. The base station receives these periodic transmissions and provides feedback, allowing the system to achieve higher reliability through repeated attempts while managing time consumption through controlled periodicity rather than continuous transmission.
Solution Approach 2:
The base station provides feedback information after receiving the preamble transmission, indicating whether the transmission was successful or if retransmission is needed. This feedback mechanism allows the system to optimize the repetition process by stopping unnecessary transmissions after successful communication, thereby reducing overall time loss while maintaining reliability.
3Adaptability or versatility
If dedicated random access configuration is provided for RC UE, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing dedicated random access configuration information specifically tailored for RC UE, distinguishing these configurations from those for full-capability UEs. The configuration includes specific parameters such as dedicated preamble sequences, repetition numbers, and resource allocation that are optimized for RC UE capabilities, thereby improving adaptability without requiring complete system redesign.
Solution Approach 2:
The random access configuration framework maintains universality by serving multiple purposes: it enables RC UE to perform random access, provides repetition transmission for reliability enhancement, and allows the base station to identify and manage RC UE specifically. The same configuration mechanism serves both RC UE and full-capability UEs, with RC UE utilizing the enhanced repetition features.
Data Source
AI summary
A method for wireless communication between a plurality of devices includes determining the number of PUSCH repetition transmissions, determining a PUSCH transmission resource, based on random access-related configuration information and the number of PUSCH repetition transmissions, and performing the PUSCH repetition transmission based on the PUSCH transmission resource.