Dynamic PRB Bundling for Channel Estimation and Spatial Diversity
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Solution Overview
Problem
Current wireless communication technologies face challenges in performing channel estimation accurately when user equipment (UE) is scheduled across multiple slots using slot aggregation or multi-slot scheduling, while also achieving spatial diversity gain.
Innovation Solution
The implementation of dynamic bundling size mode, where a transmitting node provides bundling control information indicating the number of slots, allowing the UE to receive data using constant precoding settings across consecutive slots, enabling flexible switching between using the same precoder or changing it across slots based on channel state information freshness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE is scheduled across multiple slots using slot aggregation or multi-slot scheduling to improve transmission reliability, then channel estimation accuracy can be improved by using DMRS across multiple slots, but it becomes difficult to achieve spatial diversity gain when CSI feedback is outdated
Solution Approach 1:
The patent applies dynamics by enabling the gNB to dynamically switch between two pre-configured PRB bundling sizes (first and second bundling sizes) based on channel conditions and CSI freshness. This dynamic switching allows the system to adapt the bundling configuration in real-time, selecting larger bundling sizes when CSI is fresh for better channel estimation, and smaller bundling sizes when spatial diversity is needed, thus resolving the contradiction between channel estimation accuracy and spatial diversity gain across multiple slots.
Solution Approach 2:
The patent changes the parameter of PRB bundling size from static to dynamically switchable between two pre-configured values. By controlling the PRB bundling size parameter through DCI signaling, the system can adjust the trade-off between channel estimation accuracy (benefiting from larger bundles) and spatial diversity (benefiting from smaller bundles with more precoder variations), thereby resolving the technical contradiction.
2Measurement precision
If a larger PRB bundling size is used to improve channel estimation accuracy, then more DMRS can be utilized for estimation, but fewer different precoders can be used across the scheduling bandwidth reducing spatial diversity
Solution Approach 1:
The system dynamically switches between two pre-configured PRB bundling sizes based on whether spatial diversity or channel estimation accuracy is prioritized. When spatial diversity is needed, the system switches to the first (smaller) bundling size allowing more precoder variations. When channel estimation accuracy is prioritized, it switches to the second (larger) bundling size utilizing more DMRS, thus dynamically resolving the contradiction.
Solution Approach 2:
The patent segments the scheduling bandwidth into different PRB bundle groups with different bundling sizes. By dividing the bandwidth into multiple PRG (Precoder Resource Block Group) groups with different configurations, the system can apply different bundling strategies to different segments, allowing simultaneous optimization for both channel estimation and spatial diversity in different frequency segments.
3Adaptability or versatility
If dynamic switching between two pre-configured PRB bundling sizes is implemented to support different use cases, then flexibility is improved, but device complexity increases due to additional control signaling
Solution Approach 1:
The patent makes the existing DCI format universal by adding a new field that can indicate both PRB bundling size and other transmission parameters. This multi-functional DCI field allows the system to control multiple aspects of transmission through a single signaling mechanism, reducing overall control signaling complexity while maintaining the ability to dynamically switch between different PRB bundling configurations.
Solution Approach 2:
The system uses pre-configured PRB bundling sizes that are defined ahead of time through RRC signaling. By copying and reusing these pre-configured values rather than signaling all parameters dynamically, the system reduces control signaling overhead. The DCI only needs to indicate which pre-configured value to use, simplifying the control mechanism while maintaining flexibility.
Data Source
AI summary
According to certain embodiments, a transmitting node for transmitting data to a receiving node is provided. The transmitting node is operable at least in a dynamic bundling size mode and includes a communication interface and processing circuitry. The processing circuitry is configured, when operating in the dynamic bundling size mode, to provide the receiving node with an indication of bundling control information representing at least a number L of slots. The processing circuitry transmits data in L consecutive slots using a constant first precoding setting and transmit data in subsequent L consecutive slots using a constant second precoding setting. The first and second precoding settings are independently assignable.