Aperiodic SRS Power Offset Parameter Segmentation
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Solution Overview
Problem
In wireless communication systems, there is a need for determining the transmission power of aperiodic sounding reference signals (SRS) to ensure accurate channel estimation and uplink scheduling, as existing methods do not effectively differentiate power settings for periodic and aperiodic SRS transmissions.
Innovation Solution
A method and apparatus for transmitting an aperiodic SRS, where the user equipment (UE) receives a power offset parameter from the base station (BS) through a higher layer, sets the transmission power based on this parameter, and transmits the aperiodic SRS accordingly, using the equation PSRS,c(i)=min{PCMAX,c(i), PSRS_OFFSET,c(m)+10 log10(MSRS,c)+PO_PUSCH,c(j)+αc(j)·PLc+fc(i)} to determine the power, with PSRS_OFFSET,c(m) being a 4-bit parameter that can vary within specific dB ranges depending on UE-specific parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single power setting is used for both periodic and aperiodic SRS transmissions, then device complexity is reduced, but channel estimation accuracy deteriorates because aperiodic SRS requires different power optimization
Solution Approach 1:
The patent segments the power control parameters by separating periodic SRS and aperiodic SRS configurations. The base station transmits different power offset parameters (e.g., deltaPreambleMsg3 and deltaPUSCH) specifically for aperiodic SRS, distinct from periodic SRS parameters. This segmentation allows independent optimization of power settings for each SRS type, improving channel estimation accuracy for aperiodic transmissions without affecting periodic operations.
Solution Approach 2:
The patent applies local quality by providing targeted power control adjustments for specific uplink channels and signals. Different power offset parameters are assigned to different uplink transmissions (Preamble Msg3, PUSCH, periodic SRS, aperiodic SRS) based on their specific requirements. For example, aperiodic SRS receives dedicated power offsets to ensure sufficient power for accurate channel estimation, while other signals maintain their own optimized power levels.
2Measurement precision
If power offset parameters are transmitted through higher layer signaling, then power control accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial action by providing detailed power control parameters only when needed. The base station configures power offset parameters for aperiodic SRS through higher layer signaling (RRC configuration) but only activates them when aperiodic SRS transmissions are required. This partial configuration approach provides accurate power control when necessary while minimizing continuous signaling overhead during periods when aperiodic SRS is not used.
Solution Approach 2:
The patent utilizes parameter changes by allowing dynamic adjustment of power offset values based on channel conditions and traffic requirements. The power offset parameters (deltaPreambleMsg3, deltaPUSCH, etc.) can be modified through RRC reconfiguration to adapt to changing system conditions, providing accurate power control while maintaining flexibility to reduce signaling when parameters remain unchanged.
Data Source
AI summary
A method and a user equipment (UE) for transmitting an aperiodic sounding reference signal (SRS) in a wireless communication system are discussed. The method according to an embodiment includes receiving an aperiodic SRS power offset parameter for the aperiodic SRS from a base station (BS) through a radio resource control (RRC) signaling; receiving common parameters for SRSs, including the aperiodic SRS, from the BS through the RRC signaling; setting a transmission power of the aperiodic SRS based on the aperiodic SRS power offset parameter and the common parameters; and transmitting the aperiodic SRS to the BS based on the transmission power of the aperiodic SRS. The aperiodic SRS power offset parameter is a non-common parameter used for transmitting the aperiodic SRS but not a periodic SRS which is included in the SRSs.