SRS Antenna Selection for LTE Uplink Subframes
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Solution Overview
Problem
In LTE systems, determining the appropriate antenna for sending a SRS across multiple symbols in an uplink subframe is challenging, especially with the introduction of more symbols for SRS transmission in LTE release 16, which complicates antenna selection and frequency hopping.
Innovation Solution
A method where a terminal device determines the first index of a time unit to send the SRS based on the quantity of time units used in a subframe and consecutively used antennas, minimizing antenna switching by enabling continuous sending with the same antenna, and optionally performing frequency hopping to optimize antenna selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more symbols are used to transmit the SRS in one uplink subframe, then the SRS transmission coverage and reliability are improved, but the antenna selection complexity and switching frequency increase
Solution Approach 1:
The patent segments the uplink subframe into multiple time units (symbols) and assigns different antenna ports to different time units in a sequential manner. This segmentation allows the system to use multiple antennas for SRS transmission across multiple symbols while maintaining a systematic and manageable antenna selection process, thereby improving transmission reliability without excessive complexity.
Solution Approach 2:
The patent establishes predetermined rules for antenna port selection based on the time unit index and other parameters before actual SRS transmission. By pre-defining the antenna selection pattern (e.g., using formulas to determine which antenna port to use in which time unit), the system avoids complex real-time antenna selection decisions, thus improving reliability through consistent antenna usage while keeping the selection process simple.
2Productivity
If antenna switching is performed frequently to optimize SRS transmission, then the transmission efficiency is improved, but the power consumption and processing overhead increase
Solution Approach 1:
The patent implements periodic antenna port usage patterns where the same antenna port is used for multiple consecutive time units before switching to the next antenna port. This periodic action reduces the frequency of antenna switching compared to changing antennas every symbol, thereby maintaining SRS transmission efficiency while significantly reducing power consumption and processing overhead associated with frequent antenna switching.
Solution Approach 2:
The patent ensures continuous SRS transmission across multiple symbols by maintaining active antenna ports throughout the transmission period. By using formulas to determine appropriate antenna ports that remain active across multiple time units, the system achieves continuous useful action (SRS transmission) without requiring frequent antenna switching, thus improving efficiency while reducing energy consumption.
Data Source
AI summary
Embodiments of this application provide an SRS sending method, an SRS receiving method, and a device. A manner of determining an antenna used to send an SRS is provided. In addition, a case in which one subframe includes a plurality of symbols is considered by using a quantity of first time units that are used by a terminal device to send an SRS in one uplink subframe and a case in which one antenna is enabled to implement continuous sending as much as possible is also considered by using a quantity of first time units that are consecutively used to send the SRS in one subframe by using a same antenna.