Sounding Reference Signal Transmission via Uplink Control Channel
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting sounding reference signals from user equipment to base stations, particularly in non-periodical transmissions and managing bandwidth effectively for wideband communication systems like LTE-Advanced.
Innovation Solution
A method and apparatus for transmitting sounding reference signals that involve receiving setting information from the base station and transmitting these signals through an uplink control channel without frequency hopping, using allocated frequency resources that may include uplink data and control channels, and allowing for transmission periods similar to periodical signals with additional signals sent in subsequent subframes, potentially applying orthogonal cover codes or masking sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is performed for uplink control channel, then frequency diversity gain is improved, but transmission reliability deteriorates when frequency hopping is not allowed for sounding reference signals
Solution Approach 1:
The patent segments the uplink transmission by distinguishing between control channel transmissions (which may use frequency hopping) and sounding reference signal transmissions (which do not use frequency hopping). This segmentation allows each type of signal to be optimized independently, resolving the contradiction between maintaining frequency hopping capability for control channels while ensuring reliable sounding reference signal transmission.
2Productivity
If bandwidth is increased for wideband communication, then data rate is improved, but system complexity increases
Solution Approach 1:
The patent introduces dynamic bandwidth configuration where the bandwidth for sounding reference signals can be flexibly adjusted based on system conditions and requirements. This dynamic approach allows the system to achieve high data rates when needed while reducing complexity during normal operation, resolving the contradiction between bandwidth and system complexity.
3Measurement precision
If sounding reference signals are transmitted periodically, then channel estimation accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent changes the transmission parameters of sounding reference signals by making them non-periodic and triggered by specific events or conditions. This parameter change allows the system to maintain accurate channel estimation when needed while significantly reducing the overall transmission overhead compared to continuous periodic transmission, resolving the contradiction between measurement precision and quantity of transmission.
Data Source
AI summary
The present invention relates to a method in which a terminal transmits a sounding reference signal in a wireless communication system. Specifically, the method includes: receiving sounding reference signal setting information from a base station; and transmitting the sound reference signal to the base station on the basis of the sounding reference signal setting information, wherein an upstream link signal based on the sounding reference signal is transmitted over an upstream link control channel, and a frequency band corresponding to an upstream link data channel and a frequency band corresponding to an upstream link control channel are allocated as frequency resources for the sounding reference signal.