Multi-Antenna Terminal Switching Between Correlation Groups
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Solution Overview
Problem
Current LTE UE systems face a trade-off between MIMO and Beam forming technologies, where low antenna correlation for optimal MIMO performance compromises the gain of Beam forming, affecting cell coverage and system capacity.
Innovation Solution
Implementing a method and terminal that utilize both low-correlation and high-correlation antenna groups, switching between them based on transfer mode instructions from the eNB to ensure optimal MIMO performance without impacting Beam forming gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal polarization is adopted to reduce antenna correlation for optimal MIMO performance, then diversity gain and multiplexing capacity are improved, but Beam forming gain is reduced affecting cell coverage scope and system capacity
Solution Approach 1:
The patent applies dynamics by making the antenna correlation characteristic changeable through mode switching. The terminal dynamically switches between high-correlation antenna groups (for Beam forming) and low-correlation antenna groups (for MIMO) based on the transfer mode indication from the network, allowing the system to adapt its antenna correlation property to the required operation mode rather than being fixed.
Solution Approach 2:
The patent segments the antenna groups into different correlation characteristics. Specifically, it divides antennas into groups with high correlation (suitable for Beam forming) and groups with low correlation (suitable for MIMO), allowing selective use of appropriate antenna groups based on the transfer mode, thus resolving the contradiction between the two technologies' requirements.
2Power
If single transmit antenna is used in TDD mode for Beam forming, then Beam forming can be implemented, but MIMO performance is compromised due to inability to utilize multiple antennas simultaneously
Solution Approach 1:
The system dynamically switches between single-antenna mode (for Beam forming) and multi-antenna mode (for MIMO) based on network indication. When Beam forming is required, the terminal uses single transmit antenna; when MIMO is required, the terminal switches to use multiple antennas from the appropriate antenna group, thus achieving both Beam forming capability and MIMO performance at different times.
Solution Approach 2:
The terminal is designed with multi-functionality to support both Beam forming and MIMO operations. By equipping the terminal with multiple antenna groups having different correlation characteristics and the capability to switch between them, the terminal can perform both Beam forming (single antenna) and MIMO (multiple antennas) operations, making the system universal for both technologies.
Data Source
AI summary
Embodiments of the present invention disclose a method and a terminal for implementing multi-antenna transmission. The method includes: setting a group of low-correlation antennas and a group of high-correlation antennas, where the correlation between antennas in the group of low-correlation antennas is lower than the correlation between antennas in the group of high-correlation antennas; receiving a response message carrying a transfer mode switching instruction fed back by an evolved NodeB; and extracting the transfer mode switching instruction from the response message fed back by the evolved NodeB; if the transfer mode switching instruction is corresponding to a first transfer mode, switching to the group of low-correlation antennas to transmit signals; and if the transfer mode switching instruction is corresponding to a second transfer mode, switching to the group of high-correlation antennas to transmit signals.