SRS Transmission Control in Unlicensed Band Cells
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Solution Overview
Problem
Wireless communication systems face inefficiencies in signal transmission, particularly in CA-based systems, due to the lack of effective methods for managing SRS transmission timing in unlicensed bands, leading to suboptimal CSI measurement and scheduling efficiency.
Innovation Solution
A method for controlling signal transmission in wireless communication systems by configuring licensed and unlicensed band cells, where SRS transmission is performed based on received configuration information, with the option to skip or delay SRS transmission if the subframe does not belong to the UE-reserved time duration, and utilizing a channel reservation signal before SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is performed according to periodic configuration in unlicensed band cell, then CSI measurement can be obtained, but transmission may occur during non-UE-reserved time duration causing interference and resource waste
Solution Approach 1:
The patent applies dynamics by making the SRS transmission timing flexible rather than fixed. The UE dynamically determines whether to transmit SRS based on whether the configured subframe falls within a UE-reserved time duration. This dynamic adaptation allows the system to maintain CSI measurement capability while avoiding transmissions during periods when the UE is not reserved, thereby preventing interference and resolving the technical contradiction.
2Measurement precision
If SRS transmission is performed in every configured subframe, then measurement precision is maintained, but resource efficiency decreases due to transmissions during non-reserved periods
Solution Approach 1:
The patent applies the extraction principle by removing SRS transmissions from subframes that do not fall within UE-reserved time durations. Instead of transmitting SRS in every periodically configured subframe, the system extracts and eliminates transmissions during non-reserved periods. This selective removal maintains necessary CSI measurements during reserved periods while improving resource efficiency by avoiding wasteful transmissions during non-reserved periods.
3Reliability
If SRS transmission timing is fixed according to configuration, then transmission reliability is ensured, but adaptability to UE-reserved time duration decreases
Solution Approach 1:
The patent resolves this contradiction by introducing dynamic adaptability into the SRS transmission timing mechanism. While the basic periodic configuration provides a reliable baseline, the system dynamically adjusts transmission timing based on whether the configured subframe coincides with UE-reserved time durations. This dynamic approach maintains reliability through consistent periodic scheduling while simultaneously adapting to the variable UE-reserved time duration, allowing the system to flexibly align transmissions with available resources.
Data Source
AI summary
The present invention relates to a wireless communication system and, particularly, to a method and an apparatus therefor, said method comprising the steps of: configuring a plurality of cells including a licensed band cell and an unlicensed band cell; receiving SRS configuration information for the unlicensed band cell, wherein the SRS configuration information comprises subframe period and offset information for SRS transmission; and performing a procedure for transmitting SRS from a first subframe periodically configured on the unlicensed band cell on the basis of the SRS configuration information, wherein if the first subframe belongs to a UE-reserved time duration on the unlicensed band cell, then the SRS is transmitted in the first subframe, and wherein if the first subframe does not belong to the UE-reserved time duration on the unlicensed band cell, then the transmission of the SRS is skipped in the first subframe.