Aperiodic SRS Triggering via DCI Reinterpretation
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Solution Overview
Problem
Current LTE technologies face challenges in efficiently configuring and triggering aperiodic SRS transmission, particularly in enhancing SRS capacity and coverage, and in simultaneously supporting legacy and additional SRS transmissions.
Innovation Solution
The proposed solution involves reinterpreting the SRS request field in existing DCI formats to enable flexible SRS triggering. This includes configuring the bit width of the SRS request field through higher layer signaling, allowing multiple SRS parameter sets to be configured and activated using MAC CE commands, and introducing mechanisms to apply configured scrambling identities for SRS transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aperiodic SRS transmission is configured for additional SRS symbols, then SRS capacity and coverage are enhanced, but the complexity of configuration and triggering increases
Solution Approach 1:
The patent segments SRS transmission into two distinct types: legacy SRS (transmitted at the last symbol) and additional SRS (transmitted at non-last symbols). Each type has its own parameter sets and triggering mechanisms, allowing independent configuration and management, thereby enhancing overall SRS capacity while maintaining manageable complexity through structured segmentation.
Solution Approach 2:
The patent implements dynamic triggering mechanisms where the SRS request field in DCI can dynamically select between different SRS parameter sets and transmission types. This dynamic configuration allows the system to adapt SRS transmission to varying channel conditions and requirements, enhancing capacity while using standardized DCI structures to control complexity.
2Adaptability or versatility
If multiple SRS parameter sets are configured for different SRS types, then flexibility in SRS transmission is improved, but the complexity of managing and triggering different SRS types increases
Solution Approach 1:
The patent makes the existing DCI format and SRS request field multi-functional by enabling them to trigger both legacy and additional SRS transmissions. The same DCI structure can selectively activate different SRS parameter sets based on the configured SRS type, providing universal triggering capability that enhances flexibility without requiring separate triggering mechanisms for each SRS type.
Solution Approach 2:
The patent adds a new dimension to SRS configuration by introducing SRS parameter sets with specific higher-layer parameters that distinguish additional SRS from legacy SRS. This dimensional differentiation in the parameter space allows flexible configuration of multiple SRS types while maintaining a unified triggering framework, managing complexity through structured parameter organization.
3Quantity of substance
If legacy SRS and additional SRS are transmitted in the same subframe, then SRS coverage is enhanced, but the difficulty of detecting and managing transmissions increases
Solution Approach 1:
The patent applies local quality differentiation by assigning distinct properties to legacy and additional SRS transmissions within the same subframe. Legacy SRS uses traditional parameter sets associated with the last symbol, while additional SRS uses parameter sets with higher-layer configurations for non-last symbols. This local differentiation in transmission properties enables simultaneous operation while simplifying detection and management through clear distinction of transmission characteristics.
Data Source
AI summary
Methods, a base unit and a remote unit are disclosed. According to one embodiment, a method at a base unit, comprise: transmitting to a remote unit a higher layer signal for configuring one or more sounding reference signal (SRS) parameter sets for the transmission of SRS, wherein the SRS which includes a first type of SRS and a second type of SRS, the first type of SRS is transmitted at the last symbol in a normal subframe, and the second type of SRS is transmitted at any symbols other than the last symbol in the normal subframe, and transmitting to the remote unit a downlink control information (DCI) containing a SRS request field to trigger at least one SRS transmission.