Aperiodic SRS Resource Triggering Across Valid Windows for Antenna Switching
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Solution Overview
Problem
Existing SRS resource set configurations lead to Physical Downlink Control Channel (PDCCH) resource congestion and antenna switching failures due to limitations in slot format changes and fixed valid slots, especially when multiple SRS resource sets are activated simultaneously.
Innovation Solution
A method and device for triggering aperiodic SRS resource sets by allowing activation in at least one valid window, enabling flexible activation of SRS units through downlink control information (DCI), ensuring that multiple SRS resources can be sent within valid slots without causing PDCCH congestion or antenna switching failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple SRS resource sets are activated simultaneously using the valid window-based aperiodic activation method, then the SRS resources can be transmitted, but only the last activated SRS resource is transmitted causing resource waste
Solution Approach 1:
The patent divides the transmission of multiple SRS resource sets into separate time slots by introducing a transmission counter and determining specific transmission slots for each SRS resource set. This segmentation ensures that each SRS resource set is transmitted in its designated slot, preventing resource conflicts and ensuring reliable antenna switching.
Solution Approach 2:
The patent introduces dynamic slot determination mechanisms including transmission counters, valid windows, and slot offset calculations. These dynamic parameters allow the system to adaptively assign transmission slots based on the specific configuration and timing requirements of each SRS resource set, ensuring optimal resource utilization and transmission reliability.
2Adaptability or versatility
If DCI signaling dynamically modifies slot format for uplink symbols, then slot format flexibility is improved, but triggering must be repeated causing PDCCH resource congestion
Solution Approach 1:
The patent configures valid slots and valid windows in advance through RRC signaling, establishing a predetermined transmission framework. This preliminary configuration eliminates the need for dynamic slot format modification via DCI, as the transmission timing is already determined by the pre-configured valid windows and slot offset parameters.
Solution Approach 2:
The patent introduces valid window parameters and transmission counters as intermediary mechanisms that mediate between the DCI trigger and the actual SRS transmission. These intermediaries carry the timing information and control parameters needed for transmission, replacing the need for dynamic slot format modification and reducing PDCCH overhead.
3Ease of manufacture
If valid slots are fixed after RRC configuration, then configuration simplicity is maintained, but valid slots cannot be changed causing resource allocation inflexibility
Solution Approach 1:
The patent transforms the fixed valid slot concept into a dynamic valid window mechanism. The valid window is defined by a start slot and a length parameter, allowing the transmission window to move and adapt based on the slot offset calculated from DCI timing. This dynamic approach maintains configuration simplicity while providing the flexibility to adapt to different transmission scenarios.
Solution Approach 2:
The patent changes the parameters used to define valid transmission slots from fixed RRC-configured values to dynamically calculated values based on DCI timing information. The slot offset parameter is calculated based on the DCI slot and SRS slot offset configuration, allowing the valid transmission window to shift in time while maintaining a simple RRC configuration structure.
Data Source
AI summary
A method for triggering an aperiodic SRS resource set and a device are provided. The method includes: receiving downlink control information (DCI), where the DCI is used to activate an aperiodic sounding reference signal (SRS) unit; and sending the SRS unit in at least one valid window corresponding to the activated SRS unit, where there is at least one valid slot in the valid window.