RIS Timing Advance Offset for Uplink Alignment Shifts
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, the use of reconfigurable intelligent surfaces (RIS) can cause significant changes in propagation delay that exceed the maximum autonomous timing advance adjustment, leading to inefficiencies and potential intra-cell interference due to improper timing alignment of uplink communications.
Innovation Solution
A base station transmits timing offset configurations associated with different RIS states to user equipment, allowing for dynamic adjustments in timing advance to maintain proper alignment, even during state transitions, thereby reducing interference and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reconfigurable intelligent surface (RIS) is used to overcome signal obstruction, then signal coverage and connectivity are improved, but propagation delay changes significantly causing timing misalignment and intra-cell interference
Solution Approach 1:
The base station pre-configures multiple timing offset values corresponding to different RIS states before actual communication. When RIS state changes occur, the UE can directly apply the pre-configured timing offset without waiting for new configurations, thereby maintaining timing alignment while utilizing RIS for signal coverage enhancement
Solution Approach 2:
The patent implements dynamic timing offset adjustment where the timing offset configuration is adapted based on RIS state transitions. The system dynamically selects appropriate timing offsets from multiple pre-configured values according to the current RIS state, enabling the timing alignment to adapt to changing propagation conditions while maintaining signal coverage through RIS
2Manufacturing precision
If autonomous timing advance adjustment is used, then timing alignment is maintained under normal conditions, but adjustment range is limited and cannot handle significant delay changes from RIS state transitions
Solution Approach 1:
The timing offset configuration is segmented into multiple discrete values, each corresponding to a specific RIS state. This segmentation allows the system to provide targeted timing adjustments for different RIS configurations, overcoming the limited range of autonomous adjustment by offering pre-calculated offset values for various propagation scenarios
Solution Approach 2:
The system changes the timing offset parameter based on RIS state transitions. By configuring multiple timing offset values and selecting the appropriate one according to the current RIS state, the system expands the effective adjustment range beyond what autonomous timing advance can achieve alone, while maintaining precise timing alignment
3Manufacturing precision
If multiple timing offset configurations are transmitted, then timing alignment accuracy is improved during RIS state transitions, but signaling overhead and system complexity increase
Solution Approach 1:
Multiple timing offset configurations are pre-configured and stored in the UE before RIS state transitions occur. This preliminary configuration eliminates the need for real-time signaling during state transitions, reducing signaling overhead while maintaining high timing alignment accuracy through selective application of pre-configured offsets
Solution Approach 2:
The system dynamically selects from multiple pre-configured timing offset values based on current RIS state, rather than transmitting all configurations continuously. This dynamic selection approach maintains high timing alignment accuracy while reducing signaling overhead compared to continuous transmission of multiple configurations
Data Source
AI summary
Schemes and mechanisms for timing advance adjustment are provided. In a method for wireless communication, a BS transmits, to a user equipment (UE), a first timing offset configuration associated with a first reconfigurable intelligent surface (RIS) state and a second timing offset configuration associated with a second RIS state. The BS transmits, to the UE, a timing offset indication indicating one of the first timing offset configuration or the second timing offset configuration. The BS receives, from the UE based on the timing offset indication, an uplink (UL) communication.