Backhaul Link Timing Advance for 5G Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in providing efficient backhaul links for next-generation 5G networks, particularly in mmWave spectrum, where short-term blocking and interference management are significant due to the need for dense deployment and high-frequency operation, limiting the number of concurrent high-gain beams and affecting signal coverage and reliability.
Innovation Solution
The implementation of a method where a first network node adjusts its transmission timing advance relative to a second network node based on the transmission delay between them, allowing for flexible and efficient operation of access and backhaul links, even when transmission directions differ, thereby mitigating interference and enhancing coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If strict timing alignment is enforced between access and backhaul links, then interference management becomes simpler, but resource efficiency and adaptability deteriorate due to inability to handle different transmission directions
Solution Approach 1:
The patent applies dynamics by making the timing advance flexible rather than fixed. The first network node determines timing advance dynamically based on whether it is performing transmission or reception in the backhaul link, allowing the system to adapt to different transmission directions and states, thereby resolving the contradiction between interference management and resource efficiency
Solution Approach 2:
The patent changes the timing advance parameter based on the operational state of the first network node. When the first node is receiving in the backhaul link, a first timing advance is applied; when transmitting, a second timing advance is applied. This parameter adjustment enables the system to maintain interference management while improving adaptability to different transmission scenarios
2Productivity
If dense deployment of 5G cells is implemented, then network capacity increases, but short-term blocking and interference become more significant due to high-frequency operation
Solution Approach 1:
The patent segments the timing advance into different values for different operational states (first timing advance for reception, second timing advance for transmission). This segmentation allows the system to handle interference and blocking effects differently depending on the current state, thereby maintaining signal coverage reliability while supporting dense deployment for increased network capacity
Solution Approach 2:
The patent implements feedback by having the first network node determine its timing advance based on its current operational state (transmission or reception in backhaul link). This state-aware feedback mechanism enables the system to adapt to dense deployment conditions, maintaining reliability while supporting high network capacity through dense cell placement
3Measurement precision
If timing advance is set to exact transmission delay, then synchronization precision is maximized, but flexibility in handling different transmission directions deteriorates
Solution Approach 1:
The patent makes the timing advance dynamic by setting it to a first value when the first network node is receiving in the backhaul link and a second value when transmitting. This dynamic adjustment maintains synchronization precision for each specific operation while providing the flexibility needed to handle different transmission directions and states
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a first network node served by a second network node. In one embodiment, the method includes the first network node performs a transmission to the second network node with a timing advance, wherein the timing advance is set to transmission delay between the first network node and the second network node or is set to the transmission delay with a timing reduction.