SSB-Linked Beam Determination for Reliable SDT Downlink
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in beam determination during small data transmission (SDT) processes, leading to potential downlink reception failures and resource wastage, particularly in inactive states where beam alignment is not accurately maintained.
Innovation Solution
A method for determining the latest uplink transmission relative to downlink channel transmission using synchronization signal blocks (SSBs) to align beams, ensuring accurate beam selection for both network side and terminal devices, thereby improving downlink channel transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam determination is not accurately maintained during inactive state, then device complexity is reduced, but downlink reception reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by performing beam determination and alignment before the inactive state begins. The network side device determines the beam for downlink transmission in advance based on the terminal's uplink transmission beam, ensuring that beam alignment is established prior to the terminal entering inactive state. This prevents reception failures without requiring complex continuous beam tracking during the inactive period.
Solution Approach 2:
The patent implements self-service by having the terminal device autonomously determine its own beam for downlink transmission based on its uplink transmission beam. The terminal uses its own transmission characteristics to infer the appropriate downlink beam, eliminating the need for complex network-side beam determination while maintaining reliable downlink reception during inactive state.
2Reliability
If beam alignment is not accurately maintained, then energy consumption is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing beam alignment before the terminal enters inactive state. The network side device pre-determines the downlink beam based on uplink transmission information, ensuring that when the terminal becomes inactive, the beam is already aligned and ready for transmission. This eliminates the need for energy-intensive continuous beam tracking during the inactive period while maintaining transmission reliability.
3Productivity
If existing beam determination methods are used, then device complexity is maintained at current level, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously determine its own beam for downlink transmission based on its uplink transmission beam characteristics. This self-determination mechanism eliminates the need for complex network-side beam calculation and selection processes, thereby improving resource utilization efficiency without increasing device complexity.
Solution Approach 2:
The patent applies parameter changes by transforming the beam determination approach from network-side calculation based on multiple parameters to terminal-side self-determination based on its own transmission beam characteristics. This parameter simplification improves resource utilization efficiency while maintaining or reducing the complexity required for beam determination.
Data Source
AI summary
A beam determination method includes: in a transmission process of small data transmission (SDT), determining latest uplink transmission of a terminal device relative to downlink channel transmission; and determining a beam used for the downlink channel transmission of the terminal device according to a synchronization signal block (SSB) associated with the latest uplink transmission.