Cross-Carrier Aperiodic SRS Triggering Without Data Scheduling
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Solution Overview
Problem
Existing wireless communication systems, particularly in NR and LTE, lack the flexibility to trigger aperiodic sounding reference signal (A-SRS) transmissions across different uplink carriers without scheduling downlink or uplink data, limiting the efficiency of resource allocation and communication performance.
Innovation Solution
Repurpose bits in downlink control information (DCI) traditionally used for scheduling to trigger aperiodic SRS (A-SRS) on multiple uplink carriers, allowing A-SRS transmission without concurrent data scheduling, by configuring SRS resource sets and using specific DCI formats to enable cross-carrier A-SRS triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A-SRS triggering is restricted to carriers with scheduled data, then data transmission reliability is maintained, but A-SRS transmission flexibility and resource utilization efficiency deteriorate
Solution Approach 1:
The DCI format is designed to serve multiple functions: it can trigger A-SRS on PUCCH carriers, PUSCH carriers, or both simultaneously, depending on the configuration. This multi-functional DCI structure allows the system to adapt to different transmission scenarios without requiring separate triggering mechanisms, thereby improving both flexibility and resource utilization efficiency.
2Measurement precision
If separate triggering mechanisms are implemented for PUCCH and PUSCH carriers, then triggering precision is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent merges the triggering mechanisms for PUCCH and PUSCH carriers into a single unified DCI format. This DCI can simultaneously trigger A-SRS on both carrier types by setting appropriate bits, eliminating the need for separate triggering procedures while maintaining precise control over each carrier type through configured parameters.
3Productivity
If A-SRS transmission is enabled on carriers without data scheduling, then resource allocation efficiency is improved, but signal interference and system reliability may deteriorate
Solution Approach 1:
The system performs preliminary configuration of A-SRS resources and triggering parameters through higher-layer signaling before actual transmission. This pre-configuration establishes valid transmission conditions and parameters, ensuring that when A-SRS is triggered on PUCCH carriers without concurrent data scheduling, the transmission follows pre-defined reliable procedures with appropriate power control and resource allocation.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for triggering aperiodic sounding reference signal (A-SRS) transmission across multiple uplink component carriers.