NodeB Congestion Flag for Handover Reliability
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Solution Overview
Problem
Inefficient radio resource management in E-UTRA networks leads to excessive measurement reporting, handover failures, and increased signaling overheads due to inadequate congestion status communication between NodeBs, which affects quality of service and resource utilization.
Innovation Solution
Each NodeB generates a congestion status flag based on resource usage and performance metrics, allowing for efficient communication of congestion status to neighboring nodes, reducing unnecessary measurement reports, and enabling predictive admission and handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete measurement reports are exchanged between NodeBs to prevent handover failures, then handover reliability is improved, but signaling overhead increases and bandwidth is wasted
Solution Approach 1:
The patent extracts only the essential congestion status information from complete measurement reports. Instead of exchanging full measurement reports containing all resource metrics, the system extracts and transmits only a congestion status indicator that reflects whether the target cell has sufficient resources for handover, thereby reducing signaling overhead while maintaining handover reliability.
Solution Approach 2:
The patent applies partial action by transmitting only the necessary portion of measurement information (congestion status) rather than complete measurement reports. This partial information exchange is sufficient to prevent handover failures due to resource congestion, avoiding the excessive signaling overhead of full report exchange.
2Reliability
If multiple handover attempts are made to overcome resource congestion, then handover success rate is improved, but handover latency increases
Solution Approach 1:
The patent implements preliminary action by having the target NodeB proactively provide congestion status information to the serving NodeB before handover is attempted. This advance knowledge allows the serving NodeB to select appropriate target cells that are not congested, preventing handover failures and avoiding the need for multiple retry attempts, thereby reducing handover latency.
3Loss of information
If all types of measurement reports are requested from target NodeB, then resource availability information is complete, but bandwidth efficiency decreases
Solution Approach 1:
The patent applies local quality by providing different levels of measurement information based on local needs. Instead of universally exchanging all measurement report types between all NodeBs, the system provides only the specific congestion status information that is locally relevant for handover decisions, optimizing bandwidth efficiency while maintaining information completeness where needed.
Data Source
AI summary
A radio base station generates a congestion status flag, based on measured resource usage in its cell, and based on performance of sessions in the cell. The flag may be a one bit, or a small number of bits, indicating whether the base station is congested. The flag can be sent to neighboring radio base stations, for use in determining whether to perform handovers to that radio base station. The flag generated in a radio base station, and the flags generated in neighboring radio base stations, can also be sent to user equipment in a cell.