Aperiodic SRS Transmission in Multi-Format DCI Subframes
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Solution Overview
Problem
Conventional mobile communication systems lack a clear method for a mobile station apparatus to transmit an aperiodic Sounding Reference Signal (A-SRS) to a base station apparatus when multiple downlink control information formats are notified in the same subframe or for a specific time period, leading to uncertain transmission and inefficient scheduling.
Innovation Solution
The system notifies the mobile station apparatus of multiple downlink control information formats, including instructions for A-SRS transmission and a parameter, allowing the apparatus to transmit the A-SRS based on the parameter when a specific format includes instructions, ensuring efficient scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station apparatus notifies multiple downlink control information formats in the same subframe, then the scheduling flexibility and resource allocation efficiency are improved, but the mobile station apparatus becomes uncertain about which format to follow for A-SRS transmission
Solution Approach 1:
The patent applies local quality by differentiating the characteristics of different DCI formats. Specifically, it identifies which DCI format contains A-SRS transmission instructions through format-specific characteristics (such as format type indicators or field configurations). This allows the mobile station to reliably determine the correct transmission parameters based on the specific format identified, resolving the uncertainty while maintaining scheduling flexibility.
Solution Approach 2:
Instead of having the mobile station guess or select from multiple formats, the patent inverts the approach by having the base station explicitly indicate which DCI format contains A-SRS instructions. The format identification mechanism is designed so that the mobile station can directly determine the correct format through the notification content itself, eliminating ambiguity.
2Reliability
If the base station apparatus provides clear instructions for A-SRS transmission in multiple DCI formats, then the mobile station apparatus can reliably transmit A-SRS, but the control information complexity increases
Solution Approach 1:
The patent applies universality by designing DCI formats that serve multiple functions. The same DCI format structure used for general downlink control also incorporates A-SRS transmission instructions when needed. This is achieved through optional fields or format variants that can indicate A-SRS requirements without requiring entirely separate control mechanisms, thus maintaining reliability while limiting complexity increase.
Solution Approach 2:
The patent utilizes parameter changes within the DCI formats to indicate A-SRS transmission requirements. By modifying specific parameters (such as adding flags, changing field values, or adjusting format identifiers) within the existing DCI structure, the system can reliably convey A-SRS instructions without fundamentally redesigning the control information framework.
Data Source
AI summary
To provide a mobile communication system and communication method for efficient scheduling to be performed when a base station apparatus notifies a mobile station apparatus of a plurality of downlink control information formats in the same subframe and/or for some particular time period, in a mobile communication system comprised of a base station apparatus and a mobile station apparatus, the base station apparatus notifies the mobile station apparatus of a plurality of downlink control information formats including at least one downlink control information format including instructions for transmission of a sounding reference signal and a parameter in the same subframe, and the mobile station apparatus transmits a sounding reference signal set based on the parameter to the base station apparatus when among the plurality of downlink control information formats, a predetermined downlink control information format includes instructions for transmission of a sounding reference signal and the parameter.