Relay Access Node Call Admission Control for Backhaul Throughput
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Solution Overview
Problem
Relay UEs in wireless networks face limitations in effectively servicing user equipment due to limited resources from donor access nodes, particularly in scenarios where throughput requirements exceed available backhaul connection capabilities.
Innovation Solution
Implementing a method for call admission control at relay access nodes that continuously monitors the backhaul connection throughput and compares it to the throughput requirements of connected user equipment, rejecting new connection requests when requirements exceed available resources and releasing existing connections if necessary to maintain resource balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UEs are deployed to improve coverage and service quality, then coverage area and service quality are improved, but resource availability from donor access node becomes limited
Solution Approach 1:
The system performs preliminary throughput monitoring and call admission control decisions before new UEs are admitted to the relay. By continuously monitoring backhaul throughput and comparing it against required throughput, the system proactively identifies resource constraints and prevents admission of new connections that would exceed available resources, thereby maintaining service quality without overloading the relay
Solution Approach 2:
The system implements continuous feedback loops by monitoring backhaul throughput performance and using this information to dynamically adjust call admission decisions. The throughput monitoring mechanism provides real-time feedback on resource utilization, enabling the relay to adapt its admission control policy based on actual network conditions and maintain reliable service within available resource constraints
2Adaptability or versatility
If more UEs are admitted through the relay, then network service coverage is expanded, but throughput requirements exceed backhaul connection capabilities
Solution Approach 1:
The system performs preliminary throughput assessment and call admission control before admitting new UEs. By comparing the required throughput for potential new connections against the monitored backhaul throughput, the system proactively determines whether additional UEs can be admitted without exceeding backhaul capacity, thereby expanding service coverage sustainably
Solution Approach 2:
The call admission control mechanism is dynamic and adapts to changing network conditions. The system continuously monitors backhaul throughput and adjusts admission decisions in real-time based on current resource availability, allowing the relay to flexibly expand or contract its served UE population according to actual backhaul capacity rather than operating with fixed admission limits
3Productivity
If call admission control is implemented to manage resources, then resource management efficiency is improved, but system complexity increases
Solution Approach 1:
The relay access node autonomously performs throughput monitoring and call admission control decisions without requiring complex external control mechanisms. The system self-manages its resource allocation by comparing monitored throughput against requirements and making admission decisions based on its own measurements, thereby achieving efficient resource management through decentralized self-service rather than complex centralized control
Data Source
AI summary
A wireless device or UE is configured to function as a relay on behalf of a donor access node. The relay UE performs call admission controls including balancing the resources of the relay access node with the resources provided by the donor access node providing services to end UEs via the relay access node, i.e. a backhaul connection of the relay UE. The backhaul throughput is compared to a throughput requirement of the end UEs being served by the relay UE. If the throughput requirement is larger than the backhaul throughput, any new connection requests from an additional end UE may be rejected. A threshold may be defined to ensure that there are ample resources at the backhaul prior to accepting connection requests from additional end UEs.