Carrier Aggregation Handover via Joint Primary Component Carrier Selection
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Solution Overview
Problem
Current LTE-Advanced systems lack a technical solution for handover of user equipment between two eNBs in carrier aggregation scenarios, leading to inefficiencies in handover procedures and traffic load management.
Innovation Solution
A method and apparatus for determining a primary component carrier jointly between source and destination eNBs, which involves coordinating to select a primary component carrier and transmitting handover commands with indication information, allowing for seamless handover without the need for measurement information forwarding or traffic load notifications, thereby alleviating traffic load and improving handover success ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a handover procedure is performed in carrier aggregation scenario, then user equipment can be handed over between eNBs with multiple component carriers, but the system lacks a technical solution for selecting and managing the primary component carrier during handover
Solution Approach 1:
The handover procedure is segmented into distinct phases: primary component carrier selection between source and destination eNBs, handover command transmission with PCC indication, and execution at user equipment. This segmentation allows each phase to be managed independently, reducing overall procedural complexity while enabling carrier aggregation handover capability.
Solution Approach 2:
The source and destination eNBs perform preliminary coordination to determine the primary component carrier before the actual handover execution. This preliminary action of selecting and indicating the PCC in advance simplifies the subsequent handover execution at user equipment, as the UE receives clear guidance on which carrier to use for the handover process.
2Reliability
If measurement information is forwarded between eNBs during handover, then handover decisions can be made based on channel quality, but traffic load increases due to additional signaling
Solution Approach 1:
The patent extracts and removes the requirement for measurement information forwarding between eNBs from the handover procedure. Instead of forwarding detailed measurement reports, the system relies on the destination eNB's ability to autonomously determine the primary component carrier based on available information, thereby eliminating unnecessary signaling traffic while maintaining handover reliability.
Solution Approach 2:
The destination eNB performs self-service by autonomously determining the primary component carrier for handover without requiring detailed measurement information from the source eNB. This self-service capability reduces the signaling burden while enabling the destination eNB to make informed handover decisions based on its own network conditions and capabilities.
3Productivity
If traffic load notification is implemented between eNBs, then resource allocation can be optimized, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent removes the traffic load notification mechanism from the handover procedure. Instead of implementing complex signaling exchanges between source and destination eNBs regarding traffic load, the system allows the destination eNB to autonomously assess and manage its own resource allocation, thereby eliminating the need for detailed traffic load notifications while maintaining efficient resource management.
Solution Approach 2:
The destination eNB exercises self-service by independently evaluating its own traffic conditions and resource availability to determine suitability for handover. This eliminates the need for complex inter-eNB traffic load notification mechanisms, reducing signaling overhead and processing complexity while preserving resource allocation efficiency through the eNB's own network intelligence.
Data Source
AI summary
The invention proposes a method to support a handover of a service of a user equipment between a source eNB and a destination eNB in a wireless communication network with carrier aggregation, which includes the steps of: the destination eNB determining a primary component carrier jointly with the source eNB; transmitting a handover command to be transmitted to the user equipment to the source eNB, the handover command including indication information of the primary component carrier and dedicated preamble assignment information; the source eNB receiving the handover command to be transmitted to the user equipment from the destination eNB and forwarding the handover command to the user equipment; and then the user equipment accessing the destination eNB in response to the handover command. Also apparatuses performing the foregoing method in the source eNB, the destination eNB and the user equipment are proposed correspondingly. The technical solution of the invention improves the smoothness and efficiency of handing over a service of a user equipment between two eNBs in a carrier aggregation scenario and simplifies data transmission between the source eNB and the destination eNB in the handover procedure of the user equipment.