Planar Antenna Reference Signal Orthogonal Allocation
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, the efficient transmission and reception of reference signals using planar antennas are hindered by interference between vertical sectors due to overlapping resources, which affects channel estimation and data channel demodulation.
Innovation Solution
The method involves generating user equipment-specific reference signals and determining orthogonal transmission resources for each vertical sector, using a second-dimensional planar antenna to allocate distinct physical antenna ports and zero-power antenna ports, ensuring orthogonality and reducing interference between sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are transmitted using planar antennas in overlapping vertical sectors, then channel estimation and data channel demodulation can be performed, but interference between sectors occurs due to non-orthogonal resources
Solution Approach 1:
The patent applies dimensionality change by transitioning from traditional two-dimensional antenna arrays to three-dimensional planar antenna arrays. This additional spatial dimension enables orthogonal resource allocation across overlapping vertical sectors through precise beamforming control, allowing reference signals to be transmitted in multiple dimensions simultaneously without interference. The 3D planar antenna structure provides enhanced spatial separation capabilities that resolve the interference problem while maintaining reliable channel estimation.
2Object-affected harmful factors
If orthogonal resources are allocated to each vertical sector, then interference is minimized, but resource utilization efficiency decreases due to dedicated resources per sector
Solution Approach 1:
The patent implements universality by designing a resource allocation mechanism where the same time-frequency resources can serve multiple vertical sectors simultaneously through spatial multiplexing. The base station dynamically assigns reference signal resources based on UE location and sector overlap conditions, allowing resources to be shared across sectors when orthogonality can be maintained via 3D beamforming. This multi-functional resource allocation optimizes both interference mitigation and resource utilization efficiency.
3Measurement precision
If user equipment-specific reference signals are transmitted, then channel estimation accuracy is improved, but system complexity increases due to UE-specific resource management
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting reference signal transmission parameters including spatial direction, frequency position, and time allocation based on UE-specific conditions such as location, mobility state, and sector overlap. The base station modifies these parameters in real-time to optimize channel estimation accuracy while managing system complexity through standardized algorithms that automatically adapt to different UE scenarios without requiring complex manual configuration.
Data Source
AI summary
A method for transmitting signals to a user equipment at a base station in a wireless communication system is disclosed. The method includes generating a user equipment specific reference signal sequence for the user equipment, determining transmission resources for mapping the user equipment specific reference signal sequence, based on a vertical sector in which the user equipment is located, mapping the user equipment specific reference signal sequence to the determined transmission resources, and transmitting the user equipment specific reference signal sequence to the user equipment using a second-dimensional planar antenna.