Wireless Timing Advance Offsets for IAB Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Efficient deployment and operation of wireless access nodes with wireless backhaul connections in wireless communications systems, particularly in integrated access and backhaul (IAB) networks, is challenging due to the need for synchronized communications across devices with varying distances and propagation delays, which existing technologies often fail to address effectively.
Innovation Solution
Implementing multiple timing advance offsets, including a fixed offset based on frequency range and duplexing configuration, and an adjustable offset to account for propagation delays and large distances, ensuring synchronized communications in IAB networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single fixed timing advance offset is used for all wireless devices, then device complexity is reduced and ease of operation is improved, but communication synchronization deteriorates for devices at varying distances
Solution Approach 1:
The timing advance offset is segmented into two independent components: a fixed offset (first timing advance offset) that provides baseline timing adjustment, and an adjustable offset (second timing advance offset) that compensates for propagation delays. This segmentation allows each component to serve its specific function while maintaining overall synchronization reliability.
Solution Approach 2:
The system transitions from a static single fixed offset to a dynamic two-component offset structure where the adjustable offset can be modified based on device distance and propagation delay conditions, enabling the timing advance mechanism to adapt to varying network conditions while maintaining synchronization.
2Reliability
If multiple timing advance offsets are implemented to account for varying distances, then communication synchronization is improved, but device complexity and computational overhead increase
Solution Approach 1:
The fixed timing advance offset is predetermined and pre-configured based on frequency range and duplexing mode, providing a baseline timing adjustment before devices are deployed. This preliminary configuration reduces the computational burden during operation, as devices only need to adjust the second offset based on measured propagation delays rather than calculating timing advances from scratch.
Solution Approach 2:
The system changes the timing advance parameters by introducing a second adjustable offset that is added to the fixed first offset. This parameter change allows the total timing advance to be dynamically adjusted for devices at different distances while maintaining a structured approach that reduces overall system complexity.
3Area of stationary object
If timing advance offsets are adjusted for large distances, then coverage area is extended, but signal timing precision deteriorates without proper offset compensation
Solution Approach 1:
The adjustable second timing advance offset acts as a counterweight that compensates for the timing errors introduced by large propagation delays in extended coverage scenarios. By adding this compensatory offset, the system maintains signal timing precision even when covering large geographical areas with devices at varying distances from the access node.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for multiple timing advance offsets that may be used in communications between wireless devices on a wireless communications system. A first timing advance offset may be a fixed offset that has a predetermined value or is selected from a set of available predetermined values, and a second timing advance offset may be adjustable by a wireless device. The second timing advance offset may be used in cases where relatively large distances between wireless devices are present in a system, where certain fixed timing advances are used in addition to or irrespective of a receiving devices propagation delay, where one or more parent nodes have an associated timing reference, or combinations thereof.