UE SRS Antenna Switching Power Saving
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Solution Overview
Problem
In 5G wireless communication systems, user equipment (UE) faces challenges in efficiently switching sounding reference signals (SRS) when turning off downlink or uplink antenna ports, leading to suboptimal channel estimation and resource allocation due to mismatched numbers of transmit and receive antenna ports.
Innovation Solution
The UE reconfigures SRS resources by adjusting the number of SRS resources transmitted based on the changed antenna port configuration, either by transmitting a subset of resources, re-mapping resources to active ports, or waiting for new configuration from the base station, to maintain effective channel estimation and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE turns off downlink or uplink antenna ports to save power, then power consumption is reduced, but the number of transmit and receive antenna ports become mismatched, leading to suboptimal channel estimation
Solution Approach 1:
The patent applies dynamics by making the SRS resource configuration adaptive to the active antenna port configuration. The UE dynamically determines which SRS resources to transmit based on which antenna ports are active, allowing the system to adapt to changing power saving states while maintaining accurate channel estimation through selective resource transmission.
Solution Approach 2:
The patent changes the parameter of SRS resource configuration based on antenna port status. When antenna ports are turned off, the UE modifies the SRS transmission parameters to exclude resources associated with inactive ports, thereby maintaining channel estimation accuracy despite reduced power consumption.
2Reliability
If the UE transmits all configured SRS resources to ensure complete channel estimation, then channel estimation accuracy is maintained, but power consumption increases due to unnecessary transmissions on inactive antenna ports
Solution Approach 1:
The patent extracts and removes SRS resources associated with inactive antenna ports from the transmission set. By taking out unnecessary transmissions, the UE reduces power consumption while maintaining channel estimation accuracy through the remaining active resources.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary SRS resources corresponding to active antenna ports rather than all configured resources. This partial transmission approach reduces energy consumption while providing sufficient information for accurate channel estimation.
3Use of energy by moving object
If the UE reconfigures SRS resources dynamically based on antenna port changes, then power saving efficiency is improved, but the complexity of SRS resource management increases
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously determine and reconfigure SRS resources based on its own antenna port configuration state. The UE independently identifies which resources to transmit without requiring continuous network coordination, simplifying the overall management complexity while maintaining power saving efficiency.
Solution Approach 2:
The patent applies preliminary action by having the UE pre-configure and identify SRS resources associated with each antenna port configuration. This preparation allows the UE to quickly adapt to power saving states without complex real-time calculations, reducing management complexity while maintaining efficiency.
4Measurement precision
If the base station provides detailed SRS configuration information for each antenna port combination, then SRS transmission accuracy is improved, but signaling overhead and processing time increase
Solution Approach 1:
The patent segments the SRS configuration into port-specific resource associations, allowing the UE to independently determine transmissions based on individual port status. This segmentation enables accurate SRS transmission without requiring the base station to provide complete configuration information for all possible port combinations, reducing processing time.
Solution Approach 2:
The patent uses copying by having the UE maintain a copy of the SRS resource configuration mapping in its local memory. The UE uses this stored information to determine which resources to transmit based on current antenna port status, eliminating the need for real-time base station signaling while maintaining transmission accuracy.
Data Source
AI summary
A user equipment (UE) may perform sounding reference signal (SRS) switching by transmitting one or more SRS using a plurality of SRS resources of an SRS resource set configured for SRS switching according to a first combination of downlink (DL) and uplink (UL) antenna ports. For UE power saving, the UE may turn off one or more of the DL and UL antenna ports. The UE may then reconfigure the plurality of SRS resources of the SRS resource set for SRS switching according to a second combination of the DL and UL antenna ports. In response to a power saving message from a UE, a base station may generate SRS configuration information to configure an SRS resource set for SRS antenna switching based on a combination of active DL and UL antenna ports at the UE, and send the SRS configuration information to the UE.