Wireless Access Congestion Control via Handover Information Transfer
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Solution Overview
Problem
Conventional wireless communication systems face network congestion issues, particularly during handovers, leading to starvation and unfairness among users due to the lack of effective congestion control mechanisms that share resource allocation information between cells.
Innovation Solution
A method where congestion control information, including details on service priority levels and packet discard rates, is shared between source and target cells during handovers, allowing the target cell to perform congestion control and allocate resources fairly, thereby preventing starvation and unfairness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RAN-based congestion control schemes are used, then network congestion can be controlled, but starvation problem occurs during handover
Solution Approach 1:
The source cell prepares congestion control information about the UE before handover occurs and transmits it to the target cell in advance. This preliminary action ensures that the target cell already has the necessary congestion control context when the UE arrives, preventing service interruption and starvation during handover.
Solution Approach 2:
Congestion control information acts as an intermediary carrier that transfers the congestion control state from the source cell to the target cell. This information includes priority levels and service status, enabling the target cell to continue congestion control without restarting the process, thus maintaining service continuity.
2Reliability
If differential support of specific users or services is implemented, then congestion control is possible, but unfairness and starvation occur
Solution Approach 1:
The system implements feedback by transmitting congestion control information from the source cell to the target cell, which includes the current priority level and service status of the UE. The target cell uses this feedback to adjust resource allocation and maintain fair treatment of users during handover, preventing starvation of low-priority services.
Solution Approach 2:
The invention dynamically adjusts priority levels and service parameters based on the congestion control information received from the source cell. By changing these parameters appropriately during handover, the system maintains service fairness and prevents starvation while still implementing differential support for congestion control.
3Adaptability or versatility
If handover occurs in RAN, then user mobility is supported, but congestion control information is lost
Solution Approach 1:
The source cell transmits congestion control information to the target cell before the handover is completed. This preliminary transmission ensures that no information is lost during the handover process, as the target cell already possesses the necessary congestion control context when the UE switches cells.
Solution Approach 2:
The invention ensures continuous congestion control information availability by transmitting it from source to target cell during handover. This continuity allows the congestion control mechanism to operate seamlessly across cell boundaries, supporting user mobility without information loss.
Data Source
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Figure 3(a)~3(b)
AI summary
The present invention relates to a wireless communication system and, more specifically, to a method and an apparatus for controlling wireless access congestion. A method by which a target cell supports a handover in a wireless communication system, according to one embodiment of the present invention, comprises: a step for receiving, from a source cell by the target cell, congestion control information for a terminal handed over from the source cell to the target cell; and a step for congestion controlling, by the target cell, the terminal on the basis of the congestion control information. The congestion control information includes whether a drop in service priority for the terminal occurs in the source cell.