SRS Antenna Port Switching Priority Mechanism
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Solution Overview
Problem
In wireless communication systems, particularly in NR and LTE, there is a challenge in determining the priority between SRS antenna port switching and CSI-RS measurements when they overlap, leading to potential interference and suboptimal system performance due to the limitations in scheduling types and resource availability.
Innovation Solution
The proposed solution involves prioritizing either the SRS antenna port switching or the CSI-RS measurement based on their scheduling types, with options considering periodic, semi-persistent, and aperiodic configurations, and potentially using network indications to dynamically adjust priorities, ensuring that either the SRS antenna port switching or the CSI-RS measurement is performed while disabling the non-prioritized procedure to avoid overlap and optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS antenna port switching and CSI-RS measurements are scheduled simultaneously, then resource utilization increases, but interference and system performance deteriorate due to overlapping procedures
Solution Approach 1:
The patent implements dynamic prioritization where the UE and network can adjust the priority between SRS antenna port switching and CSI-RS measurements based on scheduling type (periodic, semi-persistent, aperiodic) and network indications. This dynamic adjustment allows the system to adapt to different traffic conditions and avoid overlaps that would cause interference, thereby maintaining both high resource utilization and reliable system performance.
2Adaptability or versatility
If multiple scheduling types (periodic, semi-persistent, aperiodic) are supported, then system flexibility increases, but scheduling complexity increases making priority determination difficult
Solution Approach 1:
The patent resolves the complexity by establishing clear priority rules based on scheduling type parameters. The UE determines priority by comparing the scheduling type parameters of overlapping procedures: aperiodic procedures generally take priority over semi-persistent, which take priority over periodic. This parameter-based approach maintains scheduling flexibility while providing deterministic priority determination that reduces complexity.
Solution Approach 2:
The patent incorporates network indications that provide feedback to the UE about which procedure should be prioritized. The network can send explicit prioritization indications to resolve ambiguities when multiple procedures with different scheduling types overlap, allowing the system to maintain high flexibility while reducing the complexity burden on the UE through centralized decision-making.
3Measurement precision
If SRS antenna port switching is prioritized, then uplink channel sounding accuracy improves, but downlink measurement opportunities are reduced
Solution Approach 1:
The patent implements dynamic prioritization that can switch between prioritizing SRS antenna port switching and CSI-RS measurements based on current system conditions and network indications. When uplink channel sounding is critical, SRS gets priority; when downlink measurements are more important, CSI-RS gets priority. This dynamic approach ensures that neither measurement type is permanently disadvantaged, maintaining both channel sounding accuracy and measurement opportunities over time.
Data Source
AI summary
Systems and methods for networks having user equipment (UE) that can perform measurement/reporting of received signals and a sounding reference signal (SRS) transmission that is part of an SRS antenna port switching procedure are described herein. In some circumstances, the measurement and the SRS antenna port switching procedure overlap on one or more symbols. Across various embodiments, the UE prioritizes one of the measurement and the SRS antenna port switching procedure based on one or more of a scheduling type (periodic, semi-persistent, aperiodic) of the measurement, a scheduling type of a channel state information (CSI) report for a measurement result for the measurement, and/or a scheduling type of the SRS transmission of the SRS antenna port switching procedure. Networks that avoid overlaps by scheduling SRS transmissions away from UE signal measurements, or transmissions of signals to be measured away from UE SRS antenna port switching procedures, are also described.