HSDPA Flow Controller for Bandwidth Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing High Speed Downlink Packet Access (HSDPA) flow control algorithm fails to effectively utilize transport network resources as some users do not use their allocated bandwidth, leading to underutilization and degradation of network performance.
Innovation Solution
A radio access network node with a flow controller that measures actual utilization of capacity allocation for priority queues and adjusts capacity allocation by dividing transport network resources among them, ensuring efficient use of available bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If capacity allocation is granted to priority queues based on maximum bandwidth, then individual user data rate is improved, but transport network resource utilization deteriorates due to underutilization when users do not use their allocated bandwidth
Solution Approach 1:
The flow controller dynamically adjusts capacity allocation for priority queues based on actual utilization measurements. Instead of static maximum bandwidth allocation, the system continuously monitors and adapts capacity grants to match real-time network conditions and user实际需求, transforming the rigid allocation into a flexible, responsive mechanism that optimizes both individual user rates and overall network utilization
Solution Approach 2:
The system implements a feedback loop where the flow controller measures actual capacity utilization from priority queues and uses this information to adjust future capacity allocations. This closed-loop control ensures that capacity is allocated efficiently - granting sufficient bandwidth to users who need it while reducing allocations for users who don't utilize their full grant, thereby improving overall transport network resource utilization without compromising individual user experience
2Device complexity
If flow control algorithm allocates bandwidth without measuring actual utilization, then implementation complexity is reduced, but network performance deteriorates due to inability to reallocate unused bandwidth
Solution Approach 1:
The flow controller incorporates utilization measurement and feedback mechanisms that monitor actual bandwidth consumption by priority queues. This feedback enables the system to identify underutilized capacity and reallocate it to other queues that need it, significantly improving network performance. The added complexity of measurement and adjustment logic is justified by the substantial gains in resource efficiency and overall network throughput
Solution Approach 2:
The flow control system enables priority queues to effectively 'self-regulate' their bandwidth consumption through the measurement and adjustment mechanism. By monitoring actual utilization and automatically adjusting allocations, the system allows queues to adapt to changing conditions without manual intervention, improving network performance while keeping the control mechanism relatively simple and automated
Data Source
AI summary
A radio access network node (28) which provides High Speed Downlink Packet Access (HSDPA) comprises one or more priority queues (50i) and a flow controller (60). The priority queue (50) stores data which is to be sent on a High Speed Downlink Shared Channel (HS-DSCH) over an air interface (32) to a mobile terminal (30). The data is received in the priority queue over an interface with a superior node in accordance with a capacity allocation determined by the radio access node. The flow controller (60) measures actual utilization of the capacity allocation for the priority queue and uses the actual utilization of the capacity allocation to adjust the capacity allocation.