Multi-Component Carrier Handover Signaling for Wireless Systems
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Solution Overview
Problem
Current wireless communication systems using multiple component carriers (CCs) face challenges in handover signaling, as existing technologies lack detailed schemes for managing and transferring information associated with CCs during handovers, leading to potential service quality deterioration and increased latency.
Innovation Solution
A method and apparatus for performing handover signaling in a wireless communication system that involves transmitting a handover request message from the source eNB to the target eNB, receiving and processing handover request and command messages to determine and allocate CCs, and activating the necessary CCs for seamless handover, utilizing radio resource configuration information and activation indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If handover signaling is performed in a multi-CC system without detailed CC information transfer, then the handover process is simpler, but service quality deteriorates and latency increases
Solution Approach 1:
The patent applies preliminary action by transferring CC configuration information and activation indicators from the source eNB to the target eNB before the actual handover execution. This allows the target eNB to prepare the necessary radio resources and configuration in advance, so that when handover is needed, the UE can be quickly configured with the target CCs without service interruption or quality deterioration.
2Reliability
If CC information is transferred during handover, then service quality is maintained, but handover latency increases
Solution Approach 1:
The target eNB receives and stores CC configuration information and activation indicators from the source eNB in advance. When handover is triggered, the UE can be quickly configured with pre-prepared target CC configurations, significantly reducing the time required for handover execution while maintaining service quality.
Solution Approach 2:
The patent extracts only the essential CC information needed for handover (configuration information and activation indicators) rather than transferring all possible CC parameters. This selective information transfer maintains service quality while minimizing the data transfer overhead and time required during handover.
3Productivity
If all CCs are activated during handover, then resource utilization is maximized, but connection establishment time increases
Solution Approach 1:
The patent applies partial action by transferring only the activation indicators for specific CCs that need to be activated during handover, rather than activating all available CCs. The target eNB uses these indicators to selectively activate only the necessary CCs for the UE's handover, maximizing resource utilization for active connections while avoiding unnecessary connection establishment time for unneeded CCs.
Data Source
AI summary
A source base station (SeNB) composes a handover request message including information of which at least one or more CC formed for a user terminal (UE) and information about the performance of the UE associated with at least one or more CC and transmits the handover message to a target base station (TeNB) and the TeNB transmits to the SeNB a handover request response message including at least one CC allocation information as information for the CC which the UE uses thereby or CC allocation information and a CC activation indicator associated with the CC allocation information, and an activation composition indicator having a bit length with respect to the allocated CCs. Packet loss due to the handover is minimized by enabling the UE to rapidly use the CC(s) to be used in the TeNB as the moved cell and transmission efficiency of a system can be enhanced thereby.