Handover Cell Selection in Multi-Component Carrier Systems
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Solution Overview
Problem
In multiple component carrier systems, existing technologies face challenges in performing seamless handover due to the difficulty in accurately determining the necessary component carriers for maintaining Quality of Service (QoS) during handover, leading to potential call disconnections and inefficient resource allocation.
Innovation Solution
A method where a source Base Station sends service state information to a target Base Station, allowing the target Base Station to calculate a final determination value and select the optimal cell for handover, ensuring QoS is maintained by considering the service state information and candidate cell information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If handover is performed in a multiple component carrier system without accurate service state information, then the handover procedure can be simplified, but the Quality of Service (QoS) cannot be maintained and call disconnections occur
Solution Approach 1:
The source base station performs preliminary actions by calculating the service state information (including aggregate throughput, GBR, and AMBR) before handover and transmitting it to the target base station in advance. This allows the target base station to prepare appropriate component carrier configurations without performing complex real-time calculations during the handover execution phase, thus maintaining both simplicity and reliability.
2Adaptability or versatility
If the target BS configures multiple component carriers without accurate service state information, then component carrier configuration flexibility increases, but the ability to maintain QoS decreases
Solution Approach 1:
The source base station provides feedback information (service state information) about the UE's current communication status to the target base station. This feedback includes aggregate throughput, GBR, and AMBR values that enable the target base station to make informed decisions about component carrier configuration, ensuring both flexibility and QoS guarantee.
3Reliability
If service state information is transmitted from source BS to target BS, then QoS can be maintained during handover, but signaling overhead increases
Solution Approach 1:
The service state information (aggregate throughput, GBR, AMBR) is merged into the existing handover request message that is already being transmitted between base stations. By combining multiple pieces of information into a single signaling message rather than using separate dedicated signaling channels, the solution maintains QoS while minimizing additional signaling overhead.
Data Source
AI summary
An apparatus and method for performing handover in a multiple component carrier system. In an aspect, a method of a target Base Station (BS) performing handover in a multiple component carrier system includes receiving service state information, including information about at least one candidate cell, from a source BS through a handover request message, calculating a final determination value for determining a final cell for a User Equipment (UE) which is a subject of the handover based on the service state information, selecting the final cell by comparing the final determination value and the information about the candidate cell, and sending a handover request Acknowledgement (ACK) message, including information about the selected final cell, to the source BS.