Asymmetric Antenna Panel Switching via Dynamic SRS Uplink Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in dynamically switching between asymmetric antenna panels at user equipment (UE) due to the lack of dynamic transmission of sounding reference signals (SRSs) when active antenna panels change, leading to inefficiencies in non-codebook based uplink communications.
Innovation Solution
The UE autonomously or in response to network signaling, transmits a set of SRSs using a subset of configured resources based on a beam report, allowing dynamic switching between asymmetric antenna panels by indicating the maximum quantity of SRS resources supported, enabling the network entity to schedule PUSCH transmissions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE statically configures SRS resources for uplink transmission, then the setup is simple, but the system cannot dynamically adapt when antenna panels change
Solution Approach 1:
The patent implements dynamic SRS resource transmission by enabling the UE to autonomously determine and transmit SRS resources based on current active antenna panel configuration. The UE dynamically selects which SRS resources to transmit according to the currently active asymmetric antenna panel, allowing the system to adapt to panel changes without requiring complex network-controlled reconfiguration. This dynamic approach resolves the contradiction by making the SRS transmission flexible and panel-aware while maintaining relative simplicity through autonomous UE decision-making.
Solution Approach 2:
The UE performs self-configuration and self-selection of SRS resources based on its own antenna panel status. The UE autonomously determines which SRS resources should be transmitted corresponding to the active asymmetric antenna panel without requiring explicit network instructions for each configuration change. This self-service mechanism enables dynamic adaptation to antenna panel changes while avoiding the complexity of continuous network-controlled reconfiguration, effectively resolving the technical contradiction.
2Productivity
If the UE transmits all configured SRS resources, then resource utilization is maximized, but transmission time and overhead increase
Solution Approach 1:
The patent extracts and transmits only the necessary SRS resources corresponding to the active asymmetric antenna panel rather than transmitting all configured SRS resources. By identifying and selecting only the relevant SRS resources for the currently active panel, the system reduces transmission time and overhead while maintaining adequate resource utilization for effective uplink communication. This selective extraction approach resolves the contradiction between maximizing resource utilization and minimizing transmission time.
Solution Approach 2:
The system transmits only the partial set of SRS resources needed for the active asymmetric antenna panel rather than all available resources. This partial action approach ensures that sufficient SRS resources are transmitted for effective communication while avoiding the excessive transmission of unnecessary resources, thereby optimizing both productivity and time efficiency.
3Reliability
If the network controls all SRS resource selection, then coordination is improved, but system responsiveness to panel changes is reduced
Solution Approach 1:
The UE autonomously determines and transmits SRS resources based on its own antenna panel configuration without waiting for network instructions. This self-service capability enables immediate response to antenna panel changes while maintaining coordination with the network through standard uplink procedures. The UE independently adapts to panel changes at the speed of its own configuration updates, resolving the contradiction between coordinated control and responsive adaptation.
Solution Approach 2:
The UE proactively configures and transmits SRS resources in advance based on detected antenna panel changes, rather than waiting for network direction. This preliminary action allows the UE to prepare and transmit appropriate SRS resources immediately upon panel changes, enhancing system responsiveness while maintaining network coordination through subsequent scheduling processes.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The techniques described herein relate to dynamic transmission of sounding reference signals (SRSs) by a user equipment (UE) to support dynamic switching between asymmetric antenna panels at the UE. The UE may transmit a beam report to a network entity that indicates a maximum quantity of SRS resources supported by the UE for a physical uplink shared channel (PUSCH) for a given beam. The UE may transmit a quantity of SRSs to the network entity equal to the maximum quantity. The network entity may indicate a subset of the SRS resources for the UE to use for a PUSCH, and the UE may transmit a PUSCH using a quantity of ports equal to the quantity of indicated SRS resources. The UE may indicate multiple maximum quantities of SRS resources supported by the UE for multiple overlapping PUSCH.