PUSCH Antenna Panel Switching via Dynamic SRS Port Updates
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Solution Overview
Problem
Existing wireless communications systems face challenges in efficiently switching between antenna panels for uplink transmissions due to delays associated with RRC-reconfiguration, which can result in suboptimal performance as the best antenna panel for reception or transmission may have changed by the time the configuration is updated.
Innovation Solution
A signaling mechanism that allows a user equipment (UE) to dynamically indicate a reduced or increased number of SRS ports for PUSCH scheduling, enabling quicker updates without the delays typically associated with RRC-reconfiguration, thereby optimizing uplink transmission on the antenna beam panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If RRC-reconfiguration is used to update antenna panel configuration, then configuration accuracy is improved, but switching speed deteriorates due to delays
Solution Approach 1:
The patent segments the antenna panel configuration update process into two parts: (1) RRC-reconfiguration for initial configuration setup, and (2) MAC-CE or DCI signaling for dynamic switching between configured panels. This segmentation allows the system to benefit from both the accuracy of RRC-reconfiguration and the speed of faster signaling mechanisms.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple antenna panels using RRC-reconfiguration before actual switching is needed. The UE and network entity prepare multiple panel configurations in advance, so when switching is required, the UE can quickly activate a pre-configured panel using faster MAC-CE or DCI signaling without waiting for lengthy RRC-reconfiguration procedures.
2Reliability
If RRC-reconfiguration is used for panel switching, then reliability of configuration is improved, but transmission efficiency deteriorates due to delays
Solution Approach 1:
The patent introduces dynamics by enabling flexible switching between different signaling methods (RRC-reconfiguration, MAC-CE, DCI) depending on the operational context. The system dynamically selects the appropriate signaling mechanism: RRC-reconfiguration for initial setup and major changes, and faster MAC-CE or DCI signaling for routine panel switching, thus optimizing both reliability and transmission efficiency.
Solution Approach 2:
The patent changes the parameter of signaling message type based on the switching scenario. By transitioning from static reliance on RRC-reconfiguration to dynamic selection among multiple signaling types with different characteristics, the system can adjust the balance between reliability and transmission efficiency according to specific operational requirements.
3Adaptability or versatility
If frequent RRC-reconfiguration is performed to adapt to changing antenna panels, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent reduces system complexity by performing preliminary configuration of multiple antenna panels through RRC-reconfiguration before switching is needed. This preparation eliminates the need for frequent RRC-reconfiguration messages during operation, as the UE can quickly switch between pre-configured panels using simpler MAC-CE or DCI signaling.
Solution Approach 2:
The patent creates multiple copies of antenna panel configurations during the initial RRC-reconfiguration phase. Instead of repeatedly transmitting full configuration messages, the system stores multiple panel configuration copies at the UE, enabling fast switching without repeated complex signaling exchanges.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for method for wireless communications by a user equipment (UE), generally including receiving, from a network entity, a configuration of one or more sounding reference signals (SRS) resources for codebook-based physical uplink shared channel (PUSCH) transmissions, transmitting a report indicating a capability index associated with at least one downlink reference signal, transmitting the one or more of the SRS resources with an updated number of SRS ports associated with the capability index, if spatial relation information of the one or more of the SRS resources is associated with the downlink reference signal, receiving, from the network entity, signaling scheduling the UE to transmit a PUSCH based on one of the SRS resources, and transmitting the PUSCH with a number of PUSCH ports according to the updated number of SRS ports.