Radio Resource Control via Reduction Range Reporting

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Solution Overview

Problem

Conventional mobile communication systems face challenges in rapidly controlling uplink transmission rates due to processing load and delay, leading to inefficient radio resource management and increased costs, especially during burst data transmissions, and struggle to accurately grasp the maximum allowable transmission rate for effective call admission and handover control.

Innovation Solution

A radio resource control method that involves reporting the reduction range of the maximum allowable transmission rate from non-serving cells to the radio network controller at predetermined timings, allowing mobile stations to adjust their transmission rates accordingly and enabling the radio network controller to manage resources based on this information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the radio network controller integrally controls multiple radio base stations to determine transmission rates, then centralized resource management is achieved, but processing load and delay increase, preventing fast control

Engineering Contradiction:

Improvecentralized resource managementVSAvoidprocessing delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the transmission rate control function by introducing a reduction range parameter that is separately determined and reported. The radio base station determines the reduction range based on interference conditions, reports it to the radio network controller, and the mobile station uses this information to adjust its transmission rate. This segmentation allows faster local adjustments without burdening the centralized controller with real-time processing.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reduction range parameter acts as an intermediary between the radio base station's interference measurements and the mobile station's transmission rate adjustments. Instead of the radio network controller directly controlling every transmission rate decision, the reduction range serves as a pre-calculated guideline that enables faster, distributed control while maintaining centralized oversight.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If transmission rate control is performed slowly on the order of hundreds of milliseconds to seconds, then system complexity is reduced, but transmission efficiency decreases during burst data

Engineering Contradiction:

Improvecontrol system complexityVSAvoidtransmission efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The radio base station performs preliminary calculations of the reduction range based on current interference conditions and reports this information to the radio network controller and mobile station in advance. This preliminary action enables the mobile station to quickly adjust its transmission rate when burst data occurs, without requiring complex real-time control algorithms in the centralized controller.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces the reduction range parameter as a new control variable that changes based on interference conditions. This parameter enables the system to adapt transmission rates dynamically without requiring complete reconfiguration of the control system, thus improving responsiveness while maintaining manageable complexity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If radio resources are reserved for high-speed communications to handle burst data, then transmission efficiency improves, but radio bandwidth and hardware resources are wasted in unoccupied states

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidresource wastage

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent enables dynamic adjustment of transmission rates based on actual traffic conditions and interference levels. The mobile station uses the reduction range information to increase transmission rates during burst data periods and decrease rates during low-traffic periods, allowing the system to adapt resource usage dynamically rather than maintaining fixed reservations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements feedback through the reduction range reporting mechanism. The radio base station continuously monitors interference conditions and reports the reduction range to the mobile station, which then adjusts its transmission rate accordingly. This feedback loop enables efficient resource utilization by matching transmission rates to actual network conditions without requiring permanent resource reservations.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8942716B2Radio resource control method, radio base station, and radio network controller

Publication Date: 2015.01.27 NTT DOCOMO INC

AI summary

A radio resource control method of controlling a radio resource for transmitting user data by a mobile station via an uplink, including: sending, from a radio base station, a signal indicative of a reduction of a maximum allowable transmission rate of the user data signaled to the mobile station connected to the radio base station, to a radio network controller; and controlling, at the radio network controller, the radio resource based on the reported signal indicative of the reduction of the maximum allowable transmission rate.