MIMO Sounding Reference Signal Transmission via Time-Domain Segmentation
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Solution Overview
Problem
In MIMO wireless communication systems, user equipment with multiple antennas faces challenges in effectively transmitting sounding reference signals due to limited transmission power, which can lead to incorrect channel measurement and reduced diversity gain, especially when the number of antennas increases.
Innovation Solution
A method for transmitting sounding reference signals in a MIMO wireless communication system involves receiving parameters from a base station and generating multiple sounding reference signals using these parameters, with specific modifications such as changing transmissionComb values or cyclic shift values for each antenna, allowing effective transmission across multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas are used for transmitting sounding reference signals, then channel measurement accuracy and diversity gain are improved, but transmission power is insufficient leading to incorrect channel measurement
Solution Approach 1:
The patent divides the transmission of sounding reference signals across multiple antennas into sequential time slots rather than simultaneous transmission. Each antenna transmits its sounding reference signal in a dedicated time slot, allowing the limited transmission power to be fully utilized for each individual antenna without being diluted across multiple simultaneous transmissions. This segmentation in time domain resolves the contradiction by maintaining measurement accuracy through multiple antennas while preserving sufficient power per antenna.
Solution Approach 2:
The patent implements periodic transmission of sounding reference signals across different antennas in a structured time sequence. Each antenna transmits its signal periodically in assigned time slots, ensuring that the limited transmission power is concentrated and effectively used during each transmission instance. This periodic action pattern allows accurate channel measurement for each antenna while managing the overall power constraint of the system.
2Productivity
If multiple antennas transmit sounding reference signals simultaneously, then transmission efficiency is improved, but transmission power per antenna is reduced leading to reduced diversity gain
Solution Approach 1:
The patent segments the sounding reference signal transmission into distinct time slots for different antennas, preventing simultaneous transmission. This segmentation ensures that each antenna receives adequate transmission power to maintain diversity gain, while the overall system achieves efficient channel measurement through the structured sequential approach. The segmentation resolves the contradiction by prioritizing reliability through sufficient power per antenna while maintaining productivity through organized multi-antenna measurement.
Solution Approach 2:
The patent employs preliminary allocation of time slots to different antennas before transmission begins. This preliminary action organizes the transmission schedule to ensure each antenna has a dedicated time slot with sufficient power allocation, preventing power dilution and maintaining diversity gain. The preliminary structuring of transmission timing achieves both transmission efficiency and reliability by avoiding simultaneous low-power transmissions.
Data Source
AI summary
A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant.