Full Duplex Timing Advance Compensation for Self-Interference
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Solution Overview
Problem
In wireless communication systems, timing advancements for full duplex communications often lead to interference due to propagation delays, which existing timing advance mechanisms fail to adequately address, resulting in inter-symbol interference and reduced system throughput.
Innovation Solution
A method where user equipment (UE) receives a timing advance value and a compensation factor from the base station, determining a timing compensation amount to adjust uplink transmissions, allowing for partial or full timing advance adjustments to mitigate interference, enabling improved timing alignment and reduced self-interference in full duplex scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If timing advance is applied to correct propagation delays, then timing alignment between uplink and downlink is improved, but self-interference and inter-symbol interference increase in full duplex communication
Solution Approach 1:
The patent segments the timing advance value into multiple components: a first timing advance value for correcting propagation delay and a second timing advance value for avoiding self-interference. This segmentation allows independent optimization of timing alignment and interference mitigation, resolving the contradiction between achieving precise timing alignment and reducing self-interference in full duplex communication
Solution Approach 2:
The patent changes the timing advance parameter by introducing a compensation factor that adjusts the total timing advance value based on propagation delay characteristics. When propagation delay exceeds a threshold, the compensation factor reduces the timing advance applied to uplink transmissions, thereby reducing self-interference while maintaining adequate timing alignment
2Productivity
If full duplex communication is implemented to increase system throughput, then communication efficiency is improved, but interference management becomes more complex
Solution Approach 1:
The patent performs preliminary action by calculating and signaling the compensation factor before uplink transmissions occur. The base station determines the compensation factor based on measured propagation delays and signals it to the UE in advance, allowing the UE to pre-adjust its timing advance value. This preliminary adjustment simplifies interference management during full duplex operation by eliminating the need for complex real-time interference coordination
Solution Approach 2:
The patent implements a feedback mechanism where the base station measures propagation delays from uplink transmissions and sends compensation factors back to the UE. This closed-loop feedback enables dynamic adaptation of timing advance values to changing channel conditions, maintaining optimal performance for full duplex communication without requiring complex interference management protocols
3Area of stationary object
If timing advance value is increased to extend cell coverage, then coverage area is improved, but uplink-downlink timing misalignment increases causing interference
Solution Approach 1:
The patent changes the timing advance parameter dynamically based on propagation delay thresholds. For UEs at cell edge with large propagation delays, the compensation factor reduces the effective timing advance applied, preventing excessive timing advance from causing uplink transmissions to overlap with downlink receptions. This parameter adjustment enables extended cell coverage while maintaining timing alignment precision
Data Source
AI summary
Techniques for compensating timing advance for full duplex communications are disclosed. In an example, a user equipment (UE) may receive, from a base station, a timing advance value and a compensation factor. The UE may also determine a timing compensation amount indicating an amount of time to adjust an uplink (UL) transmission based on the timing advance value and the compensation factor. The UE may also transmit, to the base station, the UL transmission according to the timing compensation amount. Other features are also described.