SRS Transmit Antenna Pattern for Full Band Coverage
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Solution Overview
Problem
In wireless telecommunications systems, particularly in LTE uplink environments, existing technologies limit each antenna to transmit SRS only to a specific band, restricting the base station's ability to obtain channel information for the entire uplink data transmission band, leading to inefficient channel state determination and scheduling.
Innovation Solution
An SRS transmit antenna pattern is developed, allowing each antenna to transmit SRS to the entire uplink data transmission band using multiple antennas and SRS hopping, with a predefined antenna pattern that alternates antenna usage to ensure comprehensive band coverage without additional signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If each antenna transmits SRS only to a specific band, then the transmission structure is simple and easy to implement, but the base station cannot obtain channel information for the entire uplink data transmission band
Solution Approach 1:
The patent applies dynamics by making the antenna-to-band mapping relationship changeable over time through predefined antenna patterns. Each antenna transmits SRS to different bands at different time instances according to the pattern, enabling full band coverage while maintaining implementation simplicity.
Solution Approach 2:
The patent implements periodic action by using repeating antenna patterns where each antenna cyclically transmits SRS to different bands. The pattern repeats over time, ensuring that each antenna eventually covers the entire uplink data transmission band while maintaining a simple periodic structure.
2Loss of information
If antenna patterns are dynamically configured, then comprehensive band coverage is achieved, but additional signaling overhead is required
Solution Approach 1:
The patent applies self-service by using predefined antenna patterns that are automatically known to both the base station and terminal without requiring explicit signaling. The patterns are determined based on configurable parameters, enabling the system to self-configure the antenna-to-band mapping without additional overhead.
Solution Approach 2:
The patent implements parameter changes by configuring antenna patterns through adjustable parameters such as pattern period, number of antennas, and band divisions. By changing these parameters, the system adapts to different deployment scenarios without requiring dynamic signaling for pattern configuration.
3Measurement precision
If SRS hopping is enabled with multiple antennas, then channel information for the entire band is obtained, but the transmission protocol complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the uplink data transmission band into multiple bands and assigning different antennas to different bands according to the predefined pattern. This segmentation enables comprehensive channel measurement while keeping each antenna's transmission task manageable and simple.
Solution Approach 2:
The patent implements universality by designing a single predefined antenna pattern mechanism that serves multiple functions: it enables SRS hopping, achieves full band coverage, supports multiple antennas, and maintains protocol simplicity. This multi-functional approach avoids the need for separate mechanisms for each requirement.
Data Source
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AI summary
A method of SRS transmission in a terminal in a mobile communications system using multiple antennas and a Sounding Reference Signal (SRS) hopping is disclosed. The method comprises generating an SRS to be transmitted to a base station. A transmission band is set for transmitting the SRS. An antenna index is determined for transmitting the SRS so that antennas which transmit the SRS are not overlapped in the same transmission band of a first transmission section and a second transmission section. Each transmission section comprises at least one transmission time point. The SRS is transmitted to the base station according to the antenna index and the transmission band. The number of the transmission time point within the transmission section corresponds to the number of the transmission bands.