SCG Dormancy Beam Updates Using CSI Feedback
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, leading to degraded performance on downlink and uplink transmissions.
Innovation Solution
A method for a user equipment (UE) to enter a dormancy period for a secondary cell group (SCG) during which no downlink data or control transmissions are received, perform channel state information (CSI) measurements, determine an uplink beam, and transmit a measurement report to a base station (BS) to adjust downlink beams based on measurement reports, without explicit signaling from the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the UE enters a dormancy period for the SCG to reduce power consumption and network load, then energy efficiency is improved, but beam management and synchronization may be degraded due to lack of downlink transmissions
Solution Approach 1:
The UE performs CSI measurements and determines uplink beams during the dormancy period before actual data transmission resumes. This preliminary action ensures that beam management is maintained and updated even when the SCG is dormant, preventing degradation of synchronization and beam alignment.
Solution Approach 2:
The UE autonomously determines downlink beams using predefined rules and measurement reports without requiring explicit downlink transmissions from the base station during dormancy. This self-service approach allows the UE to maintain beam management independently, resolving the contradiction between power saving and beam management reliability.
2Productivity
If the UE performs CSI measurements and beam determination during dormancy period, then communication efficiency is improved upon exiting dormancy, but device complexity increases
Solution Approach 1:
The UE changes operational parameters by switching from active downlink reception to autonomous measurement and beam determination modes during dormancy. This parameter change enables efficient resumption of communication while managing processing complexity through structured measurement procedures and predefined rules.
Solution Approach 2:
The UE performs partial beam management functions (CSI measurements and uplink beam determination) during dormancy rather than complete beam management. This partial action is sufficient to maintain communication efficiency upon exiting dormancy while avoiding the full processing complexity of complete beam management.
3Loss of information
If the UE autonomously determines downlink beams without base station signaling, then signaling overhead is reduced, but the risk of beam mismatch between UE and base station increases
Solution Approach 1:
The UE transmits measurement reports containing CSI information to the base station, providing feedback that enables the base station to verify and coordinate beam selection. This feedback mechanism reduces the risk of beam mismatch while maintaining reduced signaling overhead compared to traditional explicit beam management.
Solution Approach 2:
The patent establishes common knowledge and predefined rules at both the UE and base station regarding beam determination procedures. This equipotentiality ensures that both ends operate with the same beam selection criteria, reducing beam mismatch risk while allowing autonomous operation during dormancy.
Data Source
AI summary
A method of wireless communication for a user equipment (UE) includes entering a dormancy period for a secondary cell group (SCG) of a base station (BS) during which no downlink (DL) data or control transmissions are received from the SCG; performing a channel state information (CSI) measurement on the SCG during the dormancy period to generate a measurement report; determining an uplink (UL) beam of a primary secondary cell (PSCELL) of the SCG; transmitting the measurement report to the BS on the UL beam of the SCG; and determining, during the dormancy period and after transmitting the measurement report, one or more downlink (DL) beams for communicating on the SCG based on one or more rules and based on the measurement report, wherein the one or more rules result in the BS determining the same one or more DL beams based on the measurement report.