Cell Change Timing in Multi-Cell Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in minimizing handover interruption time during transitions from E-UTRA to UTRA, leading to potential service integrity issues and reduced throughput due to limited bandwidth after handover.
Innovation Solution
A method and device for performing cell change by prioritizing synchronization with a primary cell within a specified period, followed by synchronization with secondary cells, ensuring minimal interruption time and maintaining at least 5MHz bandwidth for QoS-sensitive services by optimizing handover timing and carrier configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If handover from E-UTRA to multicarrier UTRA is enabled to maintain high bandwidth, then throughput is improved, but handover interruption time increases endangering service integrity
Solution Approach 1:
The patent segments the handover process into distinct phases: a first handover to a first UTRA cell within the first time period, and subsequent handovers to additional UTRA cells within a second time period. This segmentation allows the system to prioritize completing the critical first handover quickly to restore service, while subsequently adding additional carriers to restore bandwidth, thus resolving the contradiction between minimizing interruption time and maintaining throughput.
2Loss of time
If handover from E-UTRA to single carrier UTRA is performed to minimize interruption time, then service integrity is maintained, but bandwidth is reduced leading to lower throughput
Solution Approach 1:
The patent performs the critical handover to the first UTRA cell as a preliminary action within the first specified time period, ensuring service continuity is established quickly. Subsequently, within the second time period, additional carriers are added to restore bandwidth. This preliminary action approach ensures service integrity is maintained first, then throughput is restored, resolving the contradiction between minimizing interruption time and maintaining bandwidth.
3Productivity
If multicarrier operation is configured after handover to restore bandwidth, then throughput is improved, but additional delays occur before quality of service is restored
Solution Approach 1:
The patent performs the preliminary handover to the first UTRA cell within the first time period to establish service continuity, then immediately proceeds to configure additional carriers within the second time period. This preliminary action sequence ensures that service is restored quickly, and bandwidth is subsequently increased without significant additional delays, resolving the contradiction between restoring throughput and minimizing service restoration time.
Data Source
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AI summary
A method and system for performing cell change by a wireless device are disclosed. According to one aspect, the cell change is from a first group of cells of a first radio access technology, RAT, to a second group of cells of a second RAT. Performance of a cell change includes receiving a cell change command. In response to the cell change command, the wireless device synchronizes to interoperate with a first cell of the second group of cells of the second RAT within a first specified period of time. The wireless device synchronizes to interoperate with at least one remaining cell of the second group of cells of the second RAT within a second specified period of time ending after an end of the first specified period of time.