Sounding Reference Signal Transmission in Multiple Antenna Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in transmitting sounding reference signals effectively through multiple antennas, which is essential for accurate uplink channel state measurement and scheduling in high-speed, multimedia data transmission over limited bandwidth channels.
Innovation Solution
The method involves transmitting sounding reference signals through multiple antennas with distinct resource allocations, such as different sequence resources, time resources, and frequency resources, and applying different cyclic shifts or transmission combs, allowing each antenna to be identified by specific parameters like cyclic shift values, transmission times, or frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple antennas transmit sounding reference signals using the same resources, then the system complexity is reduced, but the uplink channel state measurement precision deteriorates due to inability to distinguish signals from different antennas
Solution Approach 1:
The patent segments the sounding reference signal transmission by allocating different time resources (different slots or symbols) to different antennas. This segmentation allows the base station to distinguish signals from different antennas in the time domain, thereby maintaining measurement precision while managing system complexity.
Solution Approach 2:
The patent introduces a new dimension for signal differentiation by using cyclic shift values applied to the same base sequence. This dimensional transformation allows multiple antennas to transmit distinguishable signals without requiring additional time or frequency resources, resolving the contradiction between resource efficiency and measurement precision.
2Measurement precision
If different time resources are allocated to each antenna for sounding reference signal transmission, then the uplink channel state measurement precision is improved, but the radio resource utilization efficiency deteriorates
Solution Approach 1:
The patent merges multiple sounding reference signals from different antennas into the same time and frequency resources by applying different cyclic shifts to the base sequence. This combining approach allows simultaneous transmission from multiple antennas without requiring additional time resources, thereby maintaining measurement precision while improving radio resource utilization efficiency.
Solution Approach 2:
The patent changes the parameter of the sounding reference signal by applying different cyclic shift values to the base sequence for different antennas. This parameter transformation enables signal differentiation without altering the time or frequency resource allocation, thus resolving the contradiction between measurement precision and resource efficiency.
3Quantity of substance
If the same base sequence is used by multiple antennas with different cyclic shifts, then the sequence resource efficiency is improved, but the ability to identify individual antenna signals deteriorates
Solution Approach 1:
The patent applies different cyclic shift parameters to the same base sequence for different antennas. This parameter modification maintains sequence resource efficiency by reusing the same base sequence while enabling accurate antenna signal identification through the distinct cyclic shift characteristics of each transmitted signal.
Data Source
AI summary
A method and an apparatus of transmitting a sounding reference signal by a user equipment is provided. A user equipment transmits a first sounding reference signal through a first antenna, and transmits a second sounding reference signal through a second antenna. Resources for transmitting the first sounding reference signal and the second sounding reference signal are partially different.