Precoding Resource Block Group Bundling for FD-MIMO Channel Estimation
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Solution Overview
Problem
In 3GPP LTE systems, the existing methods for downlink and uplink transmissions in wireless communication networks face challenges in efficiently managing resource allocation and channel estimation due to increasing network complexity, particularly in multi-user and multi-antenna configurations, which affects the performance of demodulation reference signals (DM-RS) and user equipment (UE) specific reference signals (UE-RS).
Innovation Solution
The implementation of Precoding Resource Block Group (PRG) bundling and dynamic indication of precoding granularity via DCI signaling, allowing for flexible precoding configurations that improve channel estimation and resource allocation efficiency, particularly in Full Dimension Multi-Input-Multi-Output (FD-MIMO) and Multi-User MIMO scenarios, by adjusting the size of resource blocks and precoding granularities based on system bandwidth and transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing resource allocation methods are used in multi-user and multi-antenna configurations, then network complexity increases, but channel estimation performance and resource allocation efficiency deteriorate
Solution Approach 1:
The patent segments the downlink and uplink transmissions into distinct transmission types, allowing separate handling and optimization of each direction. This segmentation enables more efficient resource allocation and channel estimation by treating downlink and uplink resources independently rather than as a unified complex system, directly addressing the network complexity issue while maintaining reliability.
Solution Approach 2:
The patent introduces dynamic indication of precoding granularity through DCI signaling, allowing the system to adaptively adjust precoding configurations based on real-time channel conditions and traffic requirements. This dynamic approach enables the network to optimize channel estimation performance without being constrained by fixed, complex resource allocation structures, thereby improving reliability while managing network complexity.
2Productivity
If existing resource allocation methods are used in multi-user and multi-antenna configurations, then network complexity increases, but resource allocation efficiency deteriorates
Solution Approach 1:
By segmenting resource allocation into downlink-specific and uplink-specific configurations, the patent enables more efficient resource utilization in each direction. The separate handling of downlink and uplink resources allows for optimized allocation strategies tailored to each transmission type, improving overall resource allocation efficiency while avoiding the complexity of unified management.
Solution Approach 2:
The patent changes the precoding granularity parameter dynamically through DCI signaling, allowing the system to adjust resource allocation efficiency based on channel conditions and traffic demands. This parameter change mechanism enables flexible optimization of resource allocation without requiring complex reconfiguration of the entire network structure, thereby improving productivity while managing complexity.
3Adaptability or versatility
If flexible precoding configurations are not implemented, then system adaptability is limited, but implementation complexity increases
Solution Approach 1:
The patent implements dynamic precoding configuration indication through DCI signaling, allowing the system to adapt precoding parameters based on real-time channel conditions without requiring complex pre-planning or static configurations. This dynamic approach provides flexibility in precoding configurations while keeping implementation complexity manageable by using existing signaling mechanisms rather than introducing entirely new complex control structures.
Data Source
AI summary
A method comprises configuring a transmission mode for a user equipment (UE) based on user equipment specific reference signals (UE-RS) and configuring one or more precoding resource groups; and providing a dynamic indication to indicate which precoding resource group is valid for a physical downlink shared channel.