SRS Transmission Across Multiple Serving Cells
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Solution Overview
Problem
Current radio communication systems face challenges in efficiently managing sounding reference signals (SRS) across multiple serving cells, particularly in configuring and activating uplink and downlink bandwidth parts (BWP) to optimize SRS transmission and reception.
Innovation Solution
The system includes a terminal apparatus and a base station apparatus with a receiver and transmitter configured to handle physical downlink control channels carrying information about SRS resource sets and BWP indices, allowing for the activation and triggering of SRS transmissions based on specific states and configurations for each serving cell, ensuring synchronized SRS transmission and reception across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SRS resource sets are configured across multiple serving cells with separate BWP management, then the system can support diverse service requirements (eMBB, URLLC, mMTC), but the device complexity and configuration management burden increase significantly
Solution Approach 1:
The patent applies universality by enabling a single SRS resource set configuration to serve multiple serving cells simultaneously. The network device configures SRS resource sets with parameters that can be applied across multiple cells, allowing the same configuration structure to handle diverse service requirements (eMBB, URLLC, mMTC) without requiring separate configurations for each cell, thus reducing device complexity while maintaining service adaptability
Solution Approach 2:
The patent merges BWP management across multiple serving cells by allowing a single BWP configuration to be associated with multiple cells. The network device configures BWPs that can be activated simultaneously across multiple serving cells, combining what would traditionally be separate management functions into a unified configuration approach, reducing the overall configuration management burden
2Reliability
If separate BWP configurations are maintained for each serving cell to optimize SRS transmission, then service-specific optimization is achieved, but the signaling overhead and configuration time increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring SRS resource sets and BWP parameters at the network device before actual SRS transmission is needed. The network device prepares configuration information including SRS resource set parameters and BWP associations in advance, so that when SRS transmission is required, the terminal device can quickly activate pre-configured parameters without undergoing time-consuming configuration procedures, thus reducing configuration time while maintaining transmission optimization
Solution Approach 2:
The patent segments the configuration into hierarchical levels: global SRS resource set configurations that apply across multiple cells, and cell-specific activation parameters. This segmentation allows the majority of configuration parameters to be set once at a higher level and reused across multiple cells, reducing the amount of configuration work needed for each individual cell while maintaining service-specific optimization capabilities
3Speed
If the terminal device independently manages BWP activation across multiple serving cells, then response speed improves, but coordination accuracy and synchronization between cells deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device reports BWP activation status and SRS transmission results back to the network device. The network device uses this feedback to adjust and coordinate BWP configurations across multiple serving cells, ensuring that while the terminal can activate BWPs quickly independently, the overall system maintains synchronization accuracy through continuous feedback loops that allow the network to correct any coordination deviations
Data Source
Figure 1A~1B
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AI summary
To efficiently transmit a sounding reference signal. One or more downlink BWPs are configured in a serving cell, one or more uplink BWPs are configured in a serving cell, each BWP of the one or more downlink BWPs is identified by a downlink BWP index, each BWP of the one or more uplink BWPs is identified by the uplink BWP index, and in a case that one of the one or more downlink BWPs configured is activated in a serving cell, one of the one or more uplink BWPs configured is activated in a serving cell, and an SRS transmission in one or more serving cells of a plurality of the serving cells is triggered, the SRS for the BWP indicated by the uplink BWP index activated in the serving cell activated is transmitted.