Aperiodic SRS Transmission via Component Carrier Triggering
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Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting aperiodic sounding reference signals (SRS) in carrier aggregation systems face challenges in accurately indicating the component carriers used for SRS transmission, leading to potential performance deterioration due to low reference signal density and overlapping signals.
Innovation Solution
A method and apparatus for transmitting an aperiodic SRS in a wireless communication system, where a terminal receives a triggering bit from a base station to transmit the SRS through at least one uplink component carrier, using techniques such as PDCCH grants, system information blocks, and carrier indication fields to indicate the specific component carriers, ensuring non-overlapping transmission in the time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference signal is assigned to all subcarriers, then channel estimation performance is improved, but the amount of transmitted data is reduced
Solution Approach 1:
The patent segments the reference signal transmission by assigning it to specific subcarriers rather than all subcarriers. This is achieved through selective subcarrier allocation where reference signals are placed on a subset of available subcarriers, allowing data to be transmitted on remaining subcarriers while maintaining adequate channel estimation capability.
Solution Approach 2:
The patent applies local quality by varying the reference signal density across different subcarrier regions. Instead of uniform assignment, reference signals are strategically positioned on specific subcarriers based on channel conditions and data requirements, optimizing both estimation accuracy and data throughput in different frequency regions.
2Quantity of substance
If the reference signal is assigned between data subcarriers, then the amount of transmitted data is increased, but channel estimation performance is deteriorated
Solution Approach 1:
The patent applies preliminary action by pre-configuring the positions and patterns of reference signals on specific subcarriers before data transmission. The reference signal locations are determined in advance based on system parameters and channel characteristics, allowing the receiver to know exactly where to expect reference signals for accurate channel estimation while maximizing data subcarrier utilization.
3Measurement precision
If aperiodic SRS is transmitted through multiple component carriers simultaneously, then channel estimation coverage is improved, but signal overlap and ambiguity occur
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing for aperiodic SRS transmission across multiple component carriers. Instead of simultaneous transmission, SRS signals are transmitted sequentially on different component carriers in different time slots, eliminating overlap and ambiguity while maintaining comprehensive channel estimation coverage across all carriers.
Solution Approach 2:
The patent resolves the contradiction by introducing a time dimension to separate simultaneous multi-carrier SRS transmissions. By allocating different time resources to SRS transmissions on different component carriers, the system achieves full carrier coverage without signal overlap, effectively transforming the problem from a frequency-domain conflict to a time-frequency resource allocation solution.
Data Source
AI summary
The present invention relates to a method and apparatus in which a terminal transmits aperiodic sounding reference signals (SRSs) in a wireless communication system. The terminal receives a triggering bit for triggering the transmission of the aperiodic SRSs from a base station, and transmits the aperiodic SRSs through at least one uplink (UL) component carrier (CC) from among a plurality of uplink component carriers.