CSI-RS Allocation for 8-Antenna Port Interference Reduction
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and LTE-A, face challenges in allocating Channel State Information-Reference Signals (CSI-RS) effectively for eight antenna ports, leading to insufficient channel information detection and interference between neighbor cells due to lack of specific allocation schemes for CSI-RS patterns across antenna ports and subframes.
Innovation Solution
The proposed solution involves allocating CSI-RSs to 8th and 9th symbols, with each pair of antenna ports sharing the same Resource Elements (REs) and being distinguished by an orthogonal code, and spacing neighbor CSI-RS allocated REs by three intervals in the frequency axis, under conditions of extended Cyclic Prefix (CP) and Time Division Duplex (TDD) schemes, to ensure orthogonality and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS is allocated to support eight antenna ports using existing CRS schemes, then channel information detection capability is improved, but interference between neighbor cells increases due to lack of specific allocation patterns
Solution Approach 1:
The patent segments the time-frequency resource grid into specific patterns for CSI-RS allocation. Different antenna ports are assigned to different resource elements according to defined patterns, allowing eight antenna ports to be supported while maintaining orthogonality and reducing inter-cell interference through structured resource division.
Solution Approach 2:
The patent applies local quality by assigning different allocation patterns to different antenna ports and cells. Each cell can select from multiple predefined patterns, allowing local optimization of resource allocation to minimize interference while maintaining detection precision for each specific antenna port.
2Device complexity
If CSI-RS allocation patterns are standardized for all cells, then implementation complexity is reduced, but adaptability to different deployment scenarios is limited
Solution Approach 1:
The patent provides universal allocation patterns that can be applied across all cells and deployment scenarios. Multiple predefined patterns offer multi-functionality, allowing the same standardized framework to adapt to different numbers of antenna ports, frequency bandwidths, and deployment configurations without requiring complex custom allocation schemes for each scenario.
3Measurement precision
If more resource elements are allocated to CSI-RS for eight antenna ports, then channel state information accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent implements partial action by allocating resource elements selectively rather than uniformly across all possible positions. The defined patterns allocate CSI-RS to specific resource elements based on antenna port requirements, providing sufficient accuracy for channel state information while avoiding excessive resource consumption through targeted rather than comprehensive allocation.
Data Source
AI summary
Embodiments of the present invention relate to a wireless communication system, and more particularly, to a technology for allocating a Channel State Information-Reference Signal (CSI-RS) in a wireless communication system. Embodiments of the present invention provides an apparatus and method for allocating CSI-RSs to resource areas, in which, under the condition of a subframe in which the CP is an extended CP, and the duplex scheme is TDD, if CSI-RSs for maximum 8 antenna ports are allocated, the CSI-RSs are allocated to the 8th and 9th symbols (symbol No. l=7 and 8), wherein each CSI-RS for every two antenna ports is allocated to the same RE while being discriminated from each other by an orthogonal code and neighbor CSI-RS allocated REs in the frequency axis are spaced by an interval of three REs.