ASA Cell Clearance Handover via Pre-Reserved Random Access Resources
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Solution Overview
Problem
In LTE-Advanced networks, existing methods for authorized shared access (ASA) struggle with efficient and fast handovers to neighboring cells during cell clearance, leading to abrupt needs for random access channel resources and ineffective load-balancing procedures.
Innovation Solution
A method and apparatus for obtaining resource information from target nodes, choosing suitable nodes for traffic transfer based on available resources, informing them of incoming traffic, and performing handover procedures using enhanced signaling messages to reserve and allocate random access channel resources, ensuring efficient traffic transfer and cell evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional handover procedures are used during cell clearance in ASA networks, then handover can be performed, but the handover process is slow and random access channel resources are not efficiently managed
Solution Approach 1:
The patent applies preliminary action by having target nodes pre-reserve random access channel resources before handover traffic actually arrives. When a cell clearance is anticipated, the source node informs target nodes in advance, which then allocate dedicated random access resources. This eliminates the need for abrupt resource requests during actual handover, significantly reducing handover preparation time and enabling faster traffic transfer.
2Productivity
If random access channel resources are allocated on-demand during handover, then resource allocation flexibility is maintained, but handover efficiency decreases due to abrupt resource needs
Solution Approach 1:
The system performs preliminary resource allocation by having target nodes reserve random access channel resources in advance based on predicted handover traffic. This is managed through signaling messages that convey resource information before handover occurs, reducing the complexity of on-demand resource management during actual handover while improving overall handover efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where source nodes inform target nodes about upcoming traffic transfers, and target nodes provide resource information back to source nodes. This feedback loop enables coordinated resource allocation, allowing the system to optimize handover efficiency while managing resource allocation complexity through structured information exchange.
3Reliability
If cell clearance is performed without advance resource reservation, then resource allocation remains simple, but load-balancing procedures become ineffective
Solution Approach 1:
The patent enhances load-balancing effectiveness by performing preliminary resource reservation at target nodes before cell clearance traffic arrives. Through enhanced signaling messages that convey resource information in advance, the system ensures that target nodes are prepared to efficiently handle incoming handover traffic, making load-balancing procedures effective while managing signaling complexity through structured protocols.
Data Source
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AI summary
The invention relates to the Authorized Shared Access (ASA) concept in which a source node temporarily uses ASA spectrum as secondary user and on request of an ASA controller said ASA spectrum needs to be cleared (evacuated) and made available to a primary spectrum user and thus target nodes have to be selected by the source node to take over traffic from the source node; the source node thus obtains resource information of at least one target node for the spectrum clearance, choose at least one target node for clearance traffic transfers based on the resource information of the at least one target node, inform the chosen at least one target node about the coming traffic transfers, and transfer traffic by using a handover procedure; the target node reserves resources after receiving the information about the coming traffic transfers.