Decoupled Uplink Downlink Timing Precompensation for Routing Switches
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Solution Overview
Problem
In communication networks, particularly in satellite-based systems like 5G and NTN, maintaining uplink continuity during routing point switching is challenging due to large propagation delays and differences in propagation paths between source and target routing points.
Innovation Solution
The implementation of a machine learning-dedicated bearer that creates a time and/or frequency pre-compensation 'transition window' to accommodate time differences and propagation path variations, ensuring continuous communication during routing point switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If routing point switching is performed in satellite-based communication networks, then network flexibility and satellite handover capability are improved, but uplink continuity is disrupted due to large propagation delays and path differences
Solution Approach 1:
The patent applies preliminary action by performing time and frequency pre-compensation before the routing point switch occurs. The UE calculates and applies compensation values based on predicted propagation delay differences between source and target routing points, ensuring that uplink transmissions arrive at the gNB synchronized with downlink receptions throughout the transition window, thereby maintaining uplink continuity during satellite handover.
2Reliability
If propagation delay differences between source and target routing points are accommodated, then uplink synchronization is maintained, but communication interruption time increases during the transition window
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting time advance and frequency compensation parameters during the routing point transition. The UE modifies these parameters based on the predicted propagation delay differences between source and target routing points, allowing continuous synchronized communication without traditional interruption gaps that would occur in conventional switching approaches.
3Device complexity
If traditional synchronous switching is used for routing point transitions, then implementation simplicity is maintained, but uplink-downlink timing alignment is lost during transition
Solution Approach 1:
The patent applies segmentation by separating the uplink and downlink timing compensation operations. The UE independently calculates time advance compensation for uplink transmissions and frequency compensation for downlink receptions, allowing each to be optimized separately while maintaining overall synchronization during the routing point transition, thus achieving precise timing alignment without overly complex coordinated switching.
Data Source
AI summary
In accordance with example embodiments of the invention there is at least a method an apparatus to perform based on determining an routing point switch in a communication network by a serving base station from a source routing point to a target routing point: creating a pre-compensation transition window for start and end of transition time between an availability of the source routing point and an availability of the target routing point, wherein the creating is starting at a point in time and using a duration of the pre-compensation transition window on at least an uplink transmission with the target routing point and at least a downlink reception from the source routing point; and based on the pre-compensation transition window, performing at least one of time or frequency pre-compensation to accommodate for time differences at the serving base station at least one of during or after the routing point switch and for differences in a propagation path between the source routing point and the target routing point to at least maintain continuity of communication by the apparatus during the start and end of transition time.