5G Random Access RBG and PRG Size Configuration
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Solution Overview
Problem
The 5G communication system faces challenges in efficiently supporting wide channel bandwidths and improving channel estimation performance due to limitations in resource block group (RBG) and precoding resource block group (PRG) sizing, particularly with the increased number of DCI bits required for resource allocation.
Innovation Solution
Configuring RBG and PRG sizes to minimize DCI bits and enhance channel estimation performance through PRB bundling, while supporting various numerologies and channel bandwidths up to 100 MHz, by determining RBG sizes based on system bandwidth and slot structures, and indirectly indicating PRG sizes using higher layer signaling or dynamic signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel bandwidth is increased to support wide bandwidth communication, then data rate is improved, but transmission coverage deteriorates due to propagation loss
Solution Approach 1:
The system segments the wide bandwidth channel into multiple resource block groups (RBGs) with configurable sizes. By dividing the broad bandwidth into manageable segments, the system can allocate resources efficiently across different bandwidth portions, maintaining high data rates while managing transmission reliability through selective RBG allocation in challenging propagation conditions
Solution Approach 2:
The RBG size is configured dynamically based on system bandwidth and slot structure requirements. This dynamic configuration allows the system to adapt RBG sizes to match current transmission conditions, optimizing the balance between data rate and coverage by adjusting resource allocation granularity in real-time
2Productivity
If resource allocation precision is increased through smaller RBG sizes, then resource allocation efficiency is improved, but DCI bit length increases
Solution Approach 1:
The system dynamically configures RBG sizes based on system bandwidth and slot structure, allowing flexible adjustment of resource allocation granularity. This dynamic approach enables efficient resource allocation without permanently committing to small RBG sizes that would always increase DCI overhead, as RBG size adapts to current transmission requirements
Solution Approach 2:
The system changes the RBG size parameter according to system bandwidth and slot structure configurations. By adjusting this key parameter, the system can optimize the trade-off between resource allocation precision and DCI signaling overhead, selecting appropriate RBG sizes that balance allocation efficiency with control message length
3Measurement precision
If precoding resource block group (PRG) size is increased for PRB bundling, then channel estimation performance is improved, but flexibility in precoding adaptation decreases
Solution Approach 1:
The PRG size is configured dynamically based on channel conditions and transmission requirements. By adjusting PRG size adaptively, the system can achieve improved channel estimation performance when using larger PRGs for bundling, while maintaining the ability to switch to smaller PRGs when rapid precoding adaptation is needed, thus balancing estimation accuracy with adaptation flexibility
Solution Approach 2:
The system changes the PRG size parameter according to channel estimation requirements and precoding adaptation needs. This parameter adjustment allows the system to optimize channel estimation performance through PRB bundling when conditions permit, while retaining flexibility to reduce PRG size for more granular precoding control when channel conditions require faster adaptation
Data Source
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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 invention provides a method and a device for a terminal transmitting/receiving a signal while executing random access in a communication system, and provides a method and a device for configuring the size of an RBG and a PRG.