Wireless Scheduling Offset Timing for Carrier Aggregation Sleep Control
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Solution Overview
Problem
In wireless communication systems, particularly in carrier aggregation with different numerologies, there is a need to clarify the application delay value for changing the minimum scheduling offset to avoid misunderstandings between the network and the UE, ensuring accurate power saving operations and preventing impossible or difficult UE operations.
Innovation Solution
A method is provided to determine the application delay value for changing the minimum scheduling offset, considering the position of the DCI in the slot, thereby clarifying when the UE can perform power-saving operations, such as sleep mode, in carrier aggregation scenarios with different numerologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If cross-slot scheduling is applied to reduce power consumption, then power saving is improved, but scheduling flexibility and timing precision deteriorate due to unclear application delay definition
Solution Approach 1:
The patent changes the parameter definition of application delay from an ambiguous concept to a precisely defined value based on DCI reception timing. By establishing that the application delay is determined by the slot and symbol position where DCI is received, the patent resolves the contradiction by providing both power saving capability (through cross-slot scheduling) and scheduling precision (through clear application timing definition).
Solution Approach 2:
The patent segments the application delay determination into specific cases based on DCI reception position (e.g., received in first 3 symbols vs. other symbols). This segmentation allows precise control over when the minimum scheduling offset change is applied, enabling both power saving operations and accurate scheduling without ambiguity.
2Adaptability or versatility
If minimum scheduling offset is changed dynamically, then scheduling adaptability is improved, but system complexity increases due to undefined application timing
Solution Approach 1:
The patent simplifies the system by clearly defining the application delay parameter as a function of DCI reception timing. This eliminates the complexity of undefined application timing while maintaining scheduling adaptability, as the network can dynamically change minimum scheduling offset values and the UE can precisely determine when to apply them based on the defined rule.
Solution Approach 2:
The system enables self-service by allowing the UE to autonomously determine the application timing of minimum scheduling offset changes based on the defined rule (application delay = function of DCI reception position). This eliminates the need for additional signaling or complex coordination, reducing system complexity while maintaining adaptability.
3Ease of operation
If application delay is not clearly defined, then implementation flexibility is improved, but operational reliability deteriorates due to misunderstandings between network and UE
Solution Approach 1:
The patent transforms the ambiguous application delay into a clearly defined parameter based on DCI reception timing. This provides both implementation flexibility (through well-defined rules that can be implemented consistently) and operational reliability (by eliminating misunderstandings between network and UE about when changes should be applied).
Data Source
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AI summary
Provided are a method for determining a point in time for applying a changed minimal scheduling offset in a wireless communication system, and a device for applying the method. The method comprises the steps of: receiving, in slot n of a scheduling cell, first DCI comprising information for informing a change in a K2min value which is a minimal scheduling offset; receiving second DCI based on the changed K2min value after slot n+X of the scheduling cell; and transmitting a PUSCH scheduled by the second DCI. The value of X is determined on the basis of: K0min which is a minimal scheduling offset currently applied to a scheduled cell scheduled by the first DCI; a subcarrier interval setting of the scheduling cell; a subcarrier interval setting of the scheduled cell; a value predetermined dependently on a subcarrier interval of the scheduling cell; etc.