Dynamic Admission Control for CDMA Network Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing CDMA mobile networks face challenges in maximizing system capacity while maintaining network stability and coverage, as admission control procedures often result in cell shrinking and poor service due to fixed admission thresholds set during the planning phase, which do not account for actual network conditions.
Innovation Solution
A method and architecture for dynamic admission control in CDMA-based mobile networks that evaluates actual system load through power measurements, allowing for the admission of additional calls by dynamically setting admission thresholds based on current resource availability, thereby maximizing system capacity and preventing network instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed admission thresholds are used based on planning phase parameters, then network stability is ensured, but system capacity is not optimized and coverage holes appear
Solution Approach 1:
The patent applies dynamics by transitioning from fixed admission thresholds to dynamic thresholds that adapt to actual network conditions. The admission threshold is continuously adjusted based on real-time measurements of system load, interference levels, and resource availability, allowing the network to optimize capacity while maintaining stability through adaptive control rather than static rules
Solution Approach 2:
The patent implements feedback mechanisms where network parameters such as load, interference, and resource usage are continuously measured and fed back into the admission control system. This feedback loop enables the system to adjust admission decisions based on actual performance, resolving the contradiction between stability and capacity by learning from real-time conditions
2Productivity
If admission thresholds are exceeded to accept additional calls, then system capacity is maximized, but network instability arises
Solution Approach 1:
The system dynamically adjusts admission thresholds based on current network conditions rather than using fixed values. When the network is lightly loaded, higher thresholds allow capacity maximization; when load is high, thresholds automatically lower to prevent instability, thus adapting the balance between capacity and stability to actual conditions
Solution Approach 2:
The patent changes admission control parameters dynamically based on measured network conditions. By adjusting thresholds as functions of real-time parameters like interference levels, load, and resource availability, the system can safely exceed traditional capacity limits when conditions permit while preventing instability when they do not
3Productivity
If cell load increases, then system capacity is utilized, but cell coverage area shrinks leading to coverage holes
Solution Approach 1:
The system uses feedback from real-time measurements of load and interference to dynamically adjust admission decisions. When coverage area is at risk, the feedback mechanism detects deteriorating conditions and prevents further admissions that would cause cell shrinking, thus maintaining both capacity and coverage through adaptive control
Data Source
AI summary
A method for controlling admission of calls to a mobile communication network having cells associated with at least one determined threshold level of operation suitable for managing cell shrinking phenomena. The method includes the operation of detecting call requests from a cell edge affected by such cell shrinking phenomena, variably exceeding the determined threshold level in uplink. A method for admitting calls to the mobile communication network in both uplink and downlink on the basis of the evaluation of the actual system load is also proposed. Preferred application is in UMTS mobile networks.