Wireless Cell Handover with Asymmetric Thresholds to Reduce Ping-Pong
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing handover procedures between cells, leading to ping-pong handovers due to inappropriate threshold settings, which result in increased signaling overhead, latency, and decreased throughput.
Innovation Solution
Implementing a method where a user equipment (UE) transmits measurement reports based on multiple threshold amounts to control handover procedures, applying a bias to previous serving cells to prevent frequent handovers, thereby reducing ping-pong effects by requiring significant improvements in signal quality before initiating handovers back to previous cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single threshold amount is used for handover measurements, then the handover procedure is simple to implement, but ping-pong handovers occur frequently due to inappropriate threshold settings
Solution Approach 1:
The patent applies parameter changes by implementing multiple threshold amounts (first threshold and second threshold) instead of a single threshold for handover measurements. The first threshold is used for initiating handover from source to target cell, while a higher second threshold is applied for handover back to the source cell, thereby preventing ping-pong effects and improving handover stability without significantly complicating the implementation.
2Reliability
If frequent handovers are allowed to maintain optimal signal quality, then connection quality is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent applies preliminary anti-action by preemptively preventing unnecessary handovers through the use of a higher second threshold for handover back to the source cell. This anticipatory measure blocks potential ping-pong handovers before they occur, thereby reducing signaling overhead and latency while maintaining adequate connection quality by allowing handovers only when truly necessary.
3Reliability
If a higher threshold is applied for handover back to previous cell, then ping-pong handovers are reduced, but handover responsiveness to actual signal conditions decreases
Solution Approach 1:
The patent applies segmentation by dividing the handover threshold into two distinct segments: a first threshold for handover from source to target cell and a second (higher) threshold for handover back to the source cell. This segmented approach provides differentiated control for different handover directions, maintaining stability by preventing ping-pong effects while preserving responsiveness through the appropriate use of the first threshold for initial handovers.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network entity associated with a first cell, a measurement report triggering a first handover procedure from the first cell to a second cell, wherein the measurement report is transmitted to the network entity based at least in part on a second measurement associated with the second cell being greater than a first measurement associated with the first cell by a first threshold amount. The UE may monitor the first measurement and the second measurement for triggering a second handover procedure from the second cell to the first cell, wherein a second measurement report is transmitted triggering the second handover procedure if the first measurement is greater than the second measurement by a second threshold amount that is greater than the first threshold amount. Numerous other aspects are described.