Sounding Reference Signal Resource Configuration in Uplink TTI
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Solution Overview
Problem
Existing wireless communication systems face challenges in configuring sounding reference signal (SRS) resources within an uplink transmission time interval (TTI) due to phase discontinuity issues, limiting flexibility and potentially disrupting scheduled uplink transmissions.
Innovation Solution
The system configures SRS resources to occupy specific symbol periods within the TTI, ensuring they are separated from scheduled uplink transmissions by at least one intervening symbol period, allowing for flexible placement and avoiding phase discontinuity impacts, using control signaling to indicate the location for SRS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS transmission is placed near the end of a subframe to avoid phase discontinuity interruption, then phase discontinuity impact on other uplink transmissions is reduced, but flexibility for location of SRS transmission is limited
Solution Approach 1:
The patent implements dynamic SRS resource configuration where the location of SRS transmissions can be flexibly adjusted within the TTI based on scheduling needs. The base station can indicate different SRS resource locations through control signaling, allowing the system to adapt SRS placement dynamically rather than being fixed at the end of subframe, thus resolving the contradiction between reliability and adaptability
Solution Approach 2:
The patent changes the parameter of SRS resource location from a fixed position to a configurable parameter that can be indicated through control signaling. By allowing the SRS resource location parameter to vary based on scheduling requirements while maintaining the constraint of avoiding phase discontinuity interference, the system achieves both flexibility and reliability
2Measurement precision
If SRS resources are configured to span multiple symbols with multiple ports, then channel quality estimation accuracy is improved, but resource overhead and complexity increase
Solution Approach 1:
The patent allows flexible configuration of SRS resources spanning multiple symbols and ports, enabling the system to use partial or full SRS resources based on channel conditions and scheduling requirements. This partial action approach improves measurement precision when needed while avoiding excessive resource usage when channel conditions are good, thus balancing measurement accuracy with system complexity
Solution Approach 2:
The patent creates a universal SRS resource configuration framework that can support multiple functions including channel quality estimation, beam management, and positioning. By designing SRS resources that can be configured with different numbers of symbols and ports based on specific needs, the system achieves multi-functionality that improves measurement precision without permanently increasing complexity
3Adaptability or versatility
If SRS transmission location is made flexible through control signaling, then adaptability to different scheduling scenarios is improved, but control signaling overhead increases
Solution Approach 1:
The patent implements local quality control where control signaling is used to indicate SRS resource locations only when flexibility is needed, rather than always transmitting full configuration information. This allows the system to achieve adaptability to different scheduling scenarios while minimizing control signaling overhead by providing information locally and selectively
Data Source
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AI summary
Methods, systems, and devices for wireless communication are described. A method may include receiving control signaling indicating a location for a sounding reference signal (SRS) resource in a transmission time interval (TTI), and transmitting an SRS in the indicated location in the TTI based on the received control signaling. Another method may include transmitting control signaling indicating a location for a SRS resource in a TTI, and receiving an SRS at the indicated location in the TTI based on the transmitted control signaling.