LTE-A Handover Control via Straight Scheduling Priority
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Solution Overview
Problem
In LTE-A networks with carrier aggregation, existing handover procedures fail to manage data loss due to mismatching or loss of scheduling information when the cross scheduling method is employed, as component carriers have different channel qualities.
Innovation Solution
A method for controlling handovers between base stations that involves transmitting scheduling information using either the straight or cross scheduling method, ensuring seamless handovers by prioritizing handovers on component carriers operating with the straight scheduling method before those using the cross scheduling method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cross scheduling method is used to transmit scheduling information on component carriers, then the ratio of overhead occupied by communication resources is reduced and throughput is improved, but data loss occurs during handover due to mismatching or loss of scheduling information
Solution Approach 1:
The patent applies preliminary action by performing handover on component carriers operating with the straight scheduling method before those using the cross scheduling method. This ensures that scheduling information is accurately transferred and managed during handover, preventing data loss while maintaining the throughput benefits of cross scheduling.
2Adaptability or versatility
If handover is executed on component carriers with cross scheduling method, then carrier aggregation functionality is maintained, but scheduling information mismatching causes data loss
Solution Approach 1:
The patent segments the handover process by separating component carriers into two groups: those operating with the straight scheduling method and those with the cross scheduling method. Handover is executed sequentially, first on straight scheduling carriers then on cross scheduling carriers, ensuring scheduling information integrity while maintaining carrier aggregation functionality.
3Speed
If handover procedure is simplified without considering scheduling method differences, then handover execution is faster, but data loss occurs due to scheduling information issues
Solution Approach 1:
The patent implements preliminary action by pre-establishing a handover sequence that prioritizes straight scheduling component carriers. This preliminary arrangement enables faster handover execution compared to handling all carriers uniformly, while simultaneously preventing data loss through proper scheduling information management.
Data Source
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AI summary
Provided is a method for controlling a handover from a first base station to a second base station by a user equipment that performs radio communication over a communication channel formed by aggregating a plurality of component carriers, wherein scheduling information on each component carrier is transmitted to the user equipment according to either of a straight scheduling method and a cross scheduling method, and the method includes at the first base station, commanding first the user equipment to perform a handover from the first base station to the second base station on a second component carrier to be operated according to the straight scheduling method in the second base station, when it is determined that a handover on a first component carrier following the cross scheduling method is to be executed.