Call Admission Control via Average Transmission Data Rate

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Solution Overview

Problem

Conventional call admission control methods in mobile communication systems fail to adaptively manage call admissions based on the method of generating packet data and the mode of a cell, leading to inconsistent transmission data rates for mobile stations at capacity limits.

Innovation Solution

A call admission control device that estimates congestion status by measuring the average transmission data rate of mobile stations and sets a minimum transmission data rate threshold, allowing adaptive call admission control based on the number and ratio of stations below this threshold, ensuring consistent data rates regardless of traffic conditions and cell environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional call admission control based on number of mobile stations is used, then the control method is simple, but the transmission data rate becomes inconsistent depending on cell mode and traffic conditions

Engineering Contradiction:

Improvecall admission control simplicityVSAvoidtransmission data rate consistency

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent changes the control parameter from simple number of mobile stations to average transmission data rate, which adaptively reflects actual channel conditions and traffic patterns, ensuring consistent QoS across different cell modes and traffic types

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If the number of mobile stations at capacity limit is kept constant, then the call admission control is straightforward, but the transmission data rate fluctuates depending on radio channel quality

Engineering Contradiction:

Improvecall admission control mechanismVSAvoidtransmission data rate stability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces feedback mechanism by continuously measuring average transmission data rates of mobile stations and using this information to dynamically adjust call admission decisions, creating a closed-loop control system that maintains stable QoS

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If call admission is controlled based on total number of mobile stations, then the control method is uniform, but it cannot adapt to different traffic patterns and cell modes

Engineering Contradiction:

Improveadaptation to traffic and cell conditionsVSAvoidcall admission control method

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the control parameter from static number of mobile stations to dynamic average transmission data rate, which automatically adapts to different traffic patterns (FTP vs Web browsing) and cell modes (indoor vs outdoor) without requiring complex classification logic

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8099102B2Call admission control device and call admission control method

Publication Date: 2012.01.17 NTT DOCOMO INC

AI summary

A call admission control device efficiently controls admission of a new call. In a scheduling operation, a congestion state in a cell is estimated based on the number or ratio of the mobile stations whose average transmission data rates have been initialized, and call admission control is performed, thereby appropriately performing the call admission control regardless of the occurrence of traffic or a mode of a cell.