Sounding Reference Signal Antenna Grouping for Adjacent Cell Interference
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Solution Overview
Problem
In multi-antenna systems, the transmission of Sounding Reference Signals (SRS) by User Equipment (UE) can cause strong interference to adjacent base stations, affecting the accuracy of SRS detection due to simultaneous transmission in the same frequency band, especially when UE is close to an adjacent cell, and existing orthogonal code configurations only ensure orthogonality within the same cell.
Innovation Solution
The method involves grouping antennas into different groups, allowing each group to transmit SRS in distinct frequency bands at the same moment, with specific frequency hopping rules determined for each group to minimize interference with adjacent cells, using antenna grouping information and parameter determination for optimal SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all antennas transmit SRS in the same frequency band at the same moment to obtain channel states of all antennas simultaneously, then the base station can acquire channel states of all antennas in one measurement, but the interference with adjacent base stations increases significantly
Solution Approach 1:
The patent divides the antennas into multiple antenna groups (e.g., first antenna group and second antenna group). Each antenna group transmits SRS in different frequency bands at the same moment. This segmentation reduces the number of transmitting antennas in each frequency band, thereby reducing interference to adjacent base stations while still enabling channel state acquisition for all antennas through coordinated transmission.
Solution Approach 2:
The patent introduces frequency band differentiation as an additional dimension for SRS transmission. Instead of all antennas transmitting in the same frequency band, different antenna groups transmit in different frequency bands (e.g., first frequency band and second frequency band). This dimensional separation in frequency space reduces interference while maintaining the capability to acquire channel states of all antennas.
2Productivity
If different UEs transmit SRS in the same frequency band at the same moment, then resource utilization is improved, but interference between UEs occurs requiring orthogonal code configurations
Solution Approach 1:
The patent segments the antenna groups of different UEs to transmit SRS in different frequency bands. For example, a first UE's first antenna group transmits in a first frequency band while a second UE's first antenna group transmits in a second frequency band. This segmentation allows simultaneous transmission without interference, improving resource utilization without requiring orthogonal code configurations between UEs.
3Adaptability or versatility
If the number of antenna ports for SRS transmission is increased to improve MIMO performance, then uplink MIMO capability is enhanced, but the interference with adjacent cells increases proportionally
Solution Approach 1:
The patent segments the multiple antennas into multiple antenna groups that transmit SRS in different frequency bands. This allows the system to support a larger total number of antenna ports for enhanced MIMO capability while limiting the number of simultaneously transmitting antennas in each frequency band, thereby controlling interference to adjacent cells.
Solution Approach 2:
The patent uses frequency band differentiation to accommodate multiple antenna ports. By assigning different frequency bands to different antenna groups, the system can support more antennas (enhancing MIMO capability) without having all antennas transmit simultaneously in the same frequency band (controlling interference).
Data Source
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AI summary
The present invention discloses a method and a device for transmitting sounding reference signal in a multi-antenna system, wherein the method includes acquiring antenna grouping information, and grouping antennas according to the antenna grouping information; and transmitting SRS on the respective antennas, wherein different antenna groups transmit the SRS in different frequency bands at a same moment. With the present invention, the interference with a base station of an adjacent cell in a certain frequency band is enabled to be reduced.