Terminal SRS Power Control via MAC CE Parameter Selection
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Solution Overview
Problem
In next-generation mobile communication systems, the number of candidates for transmission power control parameters for uplink transmissions such as PUCCH, PUSCH, and SRS is restricted, leading to potential deterioration of system performance if not appropriately determined.
Innovation Solution
A terminal with a control section that determines power control parameters for SRS based on MAC CE and uses these parameters to transmit SRS, allowing for more flexible and accurate power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of candidates for transmission power control parameters is restricted, then the device complexity is reduced, but the system performance deteriorates
Solution Approach 1:
The patent makes the power control parameter selection dynamic by allowing the terminal to adaptively choose from multiple candidates based on current channel conditions, SRS resource configurations, and network requirements. This dynamic adaptation resolves the contradiction by enabling flexible parameter selection that optimizes system performance without requiring a permanently large fixed set of parameters.
Solution Approach 2:
The patent changes the power control parameters (such as pathloss reference RS, P0, alpha, and power control adjustment state) based on different SRS resource configurations and channel conditions. By allowing these parameters to change adaptively rather than being fixed, the system can achieve better performance with a manageable number of parameter candidates.
2Ease of operation
If the parameters for transmission power control are not appropriately determined, then the ease of operation is improved, but the system performance deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the network configures power control parameters based on terminal reports and channel conditions, and the terminal adjusts its SRS transmission power accordingly. This feedback loop ensures that parameters are appropriately determined through iterative optimization, resolving the contradiction between operational flexibility and performance requirements.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple power control parameter candidates through RRC signaling before actual SRS transmission. The terminal then selects from these pre-configured candidates based on current conditions, combining the benefits of advance preparation with adaptive selection to achieve both ease of operation and system performance.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a control section that determines a power control parameter for a sounding reference signal (SRS) based on a medium access control—control element (MAC CE), and a transmitting section that uses a transmission power based on the power control parameters to transmit the SRS. According to an aspect of the present disclosure, the parameter for the transmission power control can be appropriately controlled.