Massive MIMO CSI-RS Resource Allocation via Segmentation
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Solution Overview
Problem
Current mobile communication systems face challenges in effectively transmitting and receiving Channel State Information-Reference Signals (CSI-RS) in massive MIMO systems, particularly in measuring interference and optimizing resource allocation between CSI-RS and traffic channels, which affects system throughput and performance.
Innovation Solution
The method involves dividing transmission antennas into groups to transmit CSI-RS using limited resources, allocating individual time and frequency resources to each antenna group, and employing a link adaptation method that includes transmitting coarse and fine CSI-RSs to accurately measure channel states and interference, while maintaining backward compatibility with non-massive MIMO UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more resources are allocated to CSI-RS for channel measurement, then measurement precision is improved, but system throughput decreases due to reduced traffic channel resources
Solution Approach 1:
The patent segments the channel measurement process into two distinct phases: coarse channel measurement using first CSI-RS resources with relaxed precision requirements, and fine channel measurement using second CSI-RS resources with higher precision requirements. This segmentation allows each measurement phase to use appropriately sized resource allocations, preventing unnecessary resource consumption while achieving the required measurement accuracy for each stage.
Solution Approach 2:
The patent applies partial action by allocating different quantities of CSI-RS resources according to the specific measurement requirements of each channel measurement phase. Instead of uniformly allocating excessive resources to all measurements, the system allocates sufficient resources only where needed - more resources for fine measurement when high precision is required, and fewer resources for coarse measurement where basic accuracy suffices.
2Measurement precision
If CSI-RS resources are increased to support massive MIMO with many antennas, then channel state information accuracy is improved, but resource availability for traffic channels is reduced
Solution Approach 1:
The patent segments CSI-RS resource allocation into two distinct sets: first CSI-RS resources for coarse channel measurement and second CSI-RS resources for fine channel measurement. This segmentation enables the system to support massive MIMO antenna configurations by providing targeted resource allocation - sufficient resources for accurate fine measurement of individual antenna channels while avoiding unnecessary resource consumption during the initial coarse measurement phase.
Solution Approach 2:
The patent implements partial action by allocating CSI-RS resources selectively based on measurement phase requirements. During coarse measurement, fewer resources are consumed, preserving more resources for traffic channels. During fine measurement, additional resources are allocated only to the extent necessary for achieving accurate channel state information for massive MIMO operation.
3Device complexity
If a single CSI-RS resource is used for all antenna ports, then device complexity is reduced, but measurement precision degrades for massive MIMO systems
Solution Approach 1:
The patent segments the channel measurement process into two distinct phases with different resource allocations: coarse measurement using first CSI-RS resources and fine measurement using second CSI-RS resources. This segmentation enables precise measurement of individual antenna ports in massive MIMO systems by dedicating appropriate resources to each measurement phase, while keeping the overall system manageable through clear phase separation.
Solution Approach 2:
The patent applies partial action by allocating different quantities of CSI-RS resources to different measurement phases and antenna port groups. Instead of uniformly simplifying resource allocation across all antennas, the system provides enhanced resource allocation specifically where needed for fine measurement of individual antenna ports, while using reduced resources for coarse measurement phases.
Data Source
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AI summary
An apparatus and a method for generation of channel state information in a wireless communication system are provided. The method includes transmitting, by an evolved Node B (eNB),a first reference signal to a plurality of User Equipments (UEs), receiving channel state information generated based on the first reference signal from the plurality of UEs, selecting candidate UEs to which wireless resources are to be allocated and transmitting second reference signals to the selected candidate UEs, receiving channel state information generated based on the second reference signals from the candidate UEs, and selecting final UEs, to which wireless resources are to be allocated, from the candidate UEs based on the channel state information generated based on the second reference signals, and transmitting control information for data reception to the selected final UEs.