Cross-Carrier Scheduling Offset Timing for Mixed Numerologies
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Solution Overview
Problem
In wireless communication systems with carrier aggregation using different numerologies, there is a need to clarify the application delay value for minimum scheduling offset changes to prevent misunderstandings and impossible UE operations, particularly in cross-carrier scheduling scenarios.
Innovation Solution
A method is proposed to determine the application delay value for minimum scheduling offset restrictions by considering the position of DCI in the slot, ensuring clear communication between the network and the UE, thereby preventing misunderstandings and difficult UE operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling with different numerologies is used, then carrier aggregation capability is improved, but ambiguity in application delay value determination occurs
Solution Approach 1:
The patent applies parameter changes by introducing a scaling factor based on subcarrier spacing ratios. When the scheduling cell and scheduled cell have different numerologies, the application delay value is scaled according to the ratio of their subcarrier spacings. This transforms the ambiguous delay value into a precise, numerology-adjusted value that accounts for different time granularities across carriers.
2Use of energy by moving object
If minimum scheduling offset is reduced, then power consumption is reduced through cross-slot scheduling, but scheduling flexibility is constrained
Solution Approach 1:
The patent implements dynamics by making the minimum scheduling offset configurable and adjustable rather than fixed. The network can dynamically set the minimum applicable K0/K2 value based on current system conditions, traffic patterns, and UE capabilities. This allows the system to adapt the scheduling offset in real-time, balancing power saving opportunities with scheduling flexibility requirements.
3Device complexity
If application delay value is not clearly defined, then implementation complexity increases, but communication efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-defining the application delay value determination rules in the specification. Instead of requiring complex real-time calculations or negotiations between network and UE, the standard provides clear, predetermined formulas and procedures for determining application delay values. This eliminates implementation ambiguity and ensures both sides follow the same rules, improving communication efficiency.
Data Source
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AI summary
Provided are a method and device for determining an application delay value of a minimum scheduling offset limit in a wireless communication system. In the method, when DCI including information notifying a change in a minimum scheduling offset limit value in slot n of a scheduling cell is received, the changed minimum scheduling offset limit value is applied in slot n+X of the scheduling cell. Here, the X value may be determined on the basis of two parameters such as Y and Z, wherein the Y value is a minimum scheduling offset limit value applied to a scheduled cell scheduled by the DCI, and the Z value is a value determined in advance according to a subcarrier interval of the scheduling cell. In addition, the Z value may be increased by 1 according to the temporal position at which the DCI is received in the slot n.