Aperiodic SRS Configuration and Power Control for Uplink Channel Estimation
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Solution Overview
Problem
The 3GPP-LTE Advanced system lacks detailed methods for aperiodic SRS configuration and uplink transmission power control for aperiodic SRS transmission, which are essential for accurate uplink channel estimation and efficient resource utilization.
Innovation Solution
A method for a User Equipment (UE) to receive aperiodic SRS configuration information and power offset values from an eNodeB, selecting appropriate configuration based on subframe index, time relationship, and uplink channel state, and controlling uplink transmission power for aperiodic SRS transmission, allowing adaptive switching between partial and full band transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aperiodic SRS transmission is supported in LTE-A system, then uplink channel estimation accuracy is improved, but device complexity increases due to lack of detailed configuration methods and power control mechanisms
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting SRS transmission parameters including bandwidth (partial vs. full band), power offset values, and transmission timing based on uplink channel conditions and network requirements. The eNodeB configures multiple SRS bandwidth parts and power offset parameters that the UE selectively applies according to current channel state, enabling adaptive optimization without fixed complex configurations
Solution Approach 2:
The patent implements dynamics through aperiodic SRS transmission triggered by eNodeB requests rather than fixed periodic schedules. The transmission timing, bandwidth, and power level are dynamically adjusted based on real-time channel conditions and network scheduling decisions, allowing the system to adapt to varying uplink estimation needs without permanent configuration overhead
2Adaptability or versatility
If multiple aperiodic SRS configuration information are received, then adaptability is improved, but device complexity increases due to selection and management overhead
Solution Approach 1:
The patent manages multiple configurations by parameterizing SRS bandwidth parts with distinct identifiers and associated power offset values. The eNodeB provides a set of configured parameters, and the UE selects appropriate parameters based on simple criteria such as current channel quality or eNodeB indications, avoiding complex configuration management while maintaining high adaptability
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple SRS bandwidth parts and associated power offset values through higher layer signaling before aperiodic transmission is needed. This allows the UE to have ready-to-use configuration sets without performing complex real-time configuration management during actual SRS transmission moments
3Object-affected harmful factors
If uplink transmission power is controlled for aperiodic SRS, then interference is reduced, but device complexity increases due to power control mechanism requirements
Solution Approach 1:
The patent controls interference through parameter-based power adjustment where the eNodeB configures power offset values associated with each SRS bandwidth part. The UE applies these pre-configured power offsets based on simple selection criteria rather than implementing complex real-time power control algorithms, reducing both interference and device complexity
Solution Approach 2:
The patent implements feedback-based power control where the eNodeB receives uplink channel state information from aperiodic SRS transmissions and provides power offset adjustments in subsequent downlink control messages. This closed-loop feedback mechanism enables interference management through simple UE actions triggered by network instructions rather than complex autonomous power control
Data Source
AI summary
The method of the terminal transmitting the SRS on the basis of the aperiodic SRS triggering according to the present invention comprises the steps of: receiving a plurality of aperiodic SRS configuration information from the base station; receiving an aperiodic SRS transmission triggering indicator from the base station; selecting the specific aperiodic SRS configuration information among the plurality of aperiodic SRS configuration information on the basis of at least one among a sub-frame index for receiving the aperiodic SRS transmission triggering indicator, a time relation between the aperiodic SRS transmission sub-frames, and an uplink channel state; and transmitting an aperiodic SRS for the aperiodic SRS transmission triggering indicator on the basis of the selected aperiodic SRS configuration information, the plurality of aperiodic SRS configuration information including the information about a resource for transmitting the aperiodic SRS corresponding to the aperiodic SRS transmission triggering indicator. In addition, according to the present invention, the terminal can be used for receiving a power offset value for transmitting the aperiodic SRS from the base station and determining a transmission power value for transmitting the aperiodic SRS.