PUSCH Default Beam Behavior for Reliable FeMIMO Uplink
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Solution Overview
Problem
The enhancement of multi-transmit receive point (mTRP) based physical downlink control channel (PDCCH) in 5G communication systems requires improved reliability, particularly in scenarios involving the default beam behavior of the physical uplink shared channel (PUSCH).
Innovation Solution
A terminal and base station system is configured to identify and utilize the spatial relation for PUSCH based on the dedicated physical uplink control channel (PUCCH) resource with the lowest identity within the active uplink bandwidth part, ensuring consistent and reliable PUSCH transmission even when multiple spatial relations are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dedicated PUCCH resources are configured on the UL BWP, then the adaptability and beam diversity for PUSCH transmission are improved, but the complexity of determining the default spatial relation increases
Solution Approach 1:
The system enables self-service by allowing the terminal to autonomously determine the default spatial relation for PUSCH transmission based on pre-configured rules. When multiple dedicated PUCCH resources are configured, the terminal automatically selects the spatial relation corresponding to the PUCCH resource with the lowest ID, eliminating the need for additional network signaling or complex decision-making algorithms.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple dedicated PUCCH resources with associated spatial relations before PUSCH transmission occurs. The network configures these resources in advance, and the terminal prepares the default spatial relation selection based on the lowest ID rule, so that when PUSCH transmission is needed, the appropriate spatial relation is already determined without real-time computation.
2Speed
If the terminal selects spatial relation based on lowest ID rule, then the determination speed and transmission response time are improved, but the flexibility in optimizing beam selection is reduced
Solution Approach 1:
The patent utilizes parameter changes by allowing the network to control the terminal's beam selection behavior through configuration parameters. By setting whether multiple dedicated PUCCH resources are configured and defining the lowest ID rule, the network dynamically adjusts the behavior mode. This enables the system to switch between different operational states (multiple PUCCH resources vs. single PUCCH resource) based on service requirements, balancing speed and flexibility through parameter-driven adaptation.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure related generally to wireless communication system and, more specifically, the present disclosure relates to default beam behaviour of PUSCH.