Selective SRS Transmission for Multi-Component Carrier Wireless Systems
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Solution Overview
Problem
Current wireless communication systems using multiple component carriers lack a detailed scheme for transmitting channel estimation reference signals, leading to inefficient SRS transmission and increased power consumption and latency, especially when handling secondary serving cells.
Innovation Solution
The method involves determining periodic or aperiodic SRS transmission for secondary serving cells based on specific parameters, with the base station sending triggering messages to the user equipment to activate or deactivate SRS transmission, allowing for selective and efficient SRS transmission modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SRS transmission is performed for all component carriers, then channel estimation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts SRS transmission from being mandatory for all component carriers and makes it selective. Specifically, SRS transmission is configured only for certain component carriers (e.g., PCell or specific SCells) based on channel conditions and scheduling requirements, while other carriers omit SRS transmission, thereby reducing overall power consumption while maintaining necessary channel estimation accuracy.
Solution Approach 2:
Instead of performing SRS transmission on all component carriers (excessive action), the patent applies partial action by limiting SRS transmission to only those component carriers where it is most beneficial. The base station configures SRS transmission selectively based on channel quality indicators and scheduling needs, achieving sufficient channel estimation accuracy with reduced power expenditure.
2Loss of information
If SRS transmission is performed for all component carriers, then channel state information is improved, but transmission latency increases
Solution Approach 1:
The patent removes the requirement for SRS transmission on all component carriers and retains it only where necessary for accurate channel state information. By extracting SRS transmission from the universal mandate and applying it selectively based on channel conditions and scheduling requirements, the system reduces the time overhead associated with SRS transmissions while maintaining adequate channel state information for scheduling decisions.
3Device complexity
If SRS transmission configuration is simplified, then device complexity is reduced, but scheduling flexibility is worsened
Solution Approach 1:
The patent creates a universal SRS transmission configuration mechanism that serves multiple functions. The base station uses a unified configuration approach where a single parameter set (e.g., srs-TransmissionCombination) can control SRS transmission behavior across different component carriers and scenarios (periodic, aperiodic, or both), thereby maintaining scheduling flexibility without increasing device complexity.
4Productivity
If SRS transmission is activated for secondary serving cells, then uplink scheduling performance is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating SRS transmission requirements for different component carriers. For secondary serving cells (SCells), the base station evaluates channel conditions and scheduling needs locally for each cell, then configures SRS transmission only for those SCells where it provides significant scheduling performance improvement. This selective approach ensures that power is consumed only when SRS transmission on SCells yields substantial performance gains.
Data Source
AI summary
A method of receiving a sounding reference signal (SRS) in a wireless communication system supporting multiple component carriers by a base station is provided. The method includes determining periodic SRS (P-SRS) transmission or aperiodic SRS (A-SRS) transmission about at least one serving cell (SCell) to be configured for a user equipment (UE), transmitting a triggering message including an activation or deactivation of the at least one SCell and indicating information for the A-SRS transmission according to the determination, and receiving an A-SRS from the UE through an activated SCell from among the at least one SCell configured in the UE. Uplink scheduling for an additional secondary serving cell and data communication through the uplink scheduling can be performed rapidly, as compared with a scheme using only a periodic SRS.