Uplink Beam Repetition for Robust Random Access Transmission
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Solution Overview
Problem
The robustness of uplink transmission in communication systems, particularly during random access and small data transmission procedures, is a technical challenge that needs to be addressed.
Innovation Solution
A method and apparatus for determining a target uplink transmission beam and performing repetition transmission of signals such as Msg1, Msg3, MsgA, CG-PUSCH, or SRS, based on beam refinement and mode selection, using indication information from a network side device to improve transmission robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam refinement and mode selection are implemented for uplink transmission, then transmission robustness is improved, but device complexity increases
Solution Approach 1:
The patent segments the beam management process into distinct components: beam refinement procedures and mode selection mechanisms. The network side device sends indication information that separates beam direction parameters from transmission mode parameters, allowing independent optimization of each component while managing overall system complexity.
Solution Approach 2:
The network side device performs preliminary actions by sending indication information before uplink transmission occurs. This indication information pre-configures the terminal with beam refinement parameters and mode selection criteria, enabling the terminal to execute complex beam management operations without real-time computational burden.
2Adaptability or versatility
If multiple transmission modes are supported for uplink beam repetition, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic transmission modes where the network side device can adaptively select between different uplink beam repetition modes based on channel conditions. The indication information dynamically configures parameters such as beam direction, repetition count, and spatial relationships, allowing the system to transition between modes without hardware changes.
Solution Approach 2:
The patent utilizes parameter changes to achieve mode versatility. The indication information contains configurable parameters including beam refinement parameters, transmission mode identifiers, and spatial relationship parameters. By changing these parameters, the system supports multiple transmission modes (e.g., same beam repetition, different beam repetition) without adding structural complexity.
3Measurement precision
If beam refinement parameters are configured for repetition transmission, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The network side device performs beam refinement parameter configuration in advance through indication information. This preliminary configuration provides the terminal with pre-calculated optimal beam directions and spatial relationships, eliminating the need for time-consuming real-time beam searches during actual transmission.
Solution Approach 2:
The patent uses spatial relationship copying where the terminal reuses downlink beam spatial characteristics for uplink transmission. Instead of performing independent uplink beam training, the terminal copies the spatial parameters from downlink measurements, significantly reducing beam management time while maintaining measurement precision.
Data Source
AI summary
A repetition transmission method includes a terminal determining a target uplink transmission beam. The terminal performs repetition transmission of a target signal based on the target uplink transmission beam, where the target signal includes at least one of a Msg1, an Msg3, an MsgA, a CG-PUSCH, or a SRS.