Radio Base Station Timing Coordination for Interference Reduction

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Solution Overview

Problem

Conventional radio communication systems experience increased waiting times and reduced transmission efficiency due to interference between radio base stations using the same frequency band, leading to decreased data transmission speed and fewer simultaneous voice calls, with solutions like adding more base stations or upgrading to high-performance models being costly.

Innovation Solution

A radio communication system that includes timing acquiring and schedule adjusting means to prevent overlapping transmission and reception times between radio base stations, allowing for simultaneous connections within a set frequency range without increasing costs by using broadcasting information to set communication suspended times and adjust transmission timing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If radio base stations use the same frequency band for communication, then communication resources are efficiently utilized, but transmission waiting time increases exponentially due to medium busy detection

Engineering Contradiction:

Improvefrequency band utilizationVSAvoidtransmission waiting time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The system performs preliminary scheduling of transmission frames between adjacent radio base stations before actual transmission occurs. The scheduling information is exchanged in advance, allowing base stations to pre-coordinate their transmission timing and avoid conflicts, thereby eliminating the need for exponential backoff waiting periods while maintaining efficient frequency utilization.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A scheduling information parameter set acts as an intermediary mechanism between radio base stations. This parameter set carries timing and frequency coordination data, enabling base stations to indirectly coordinate their transmissions without direct interference, thus reducing waiting time while allowing multiple base stations to share the same frequency band.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the number of radio base stations is increased to reduce waiting time, then communication capacity improves, but system cost increases

Engineering Contradiction:

Improvecommunication capacityVSAvoidsystem cost

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system changes operational parameters by implementing dynamic transmission timing adjustments based on scheduling information. Instead of increasing hardware capacity, the system optimizes the timing parameters of existing base stations to reduce waiting periods and improve overall communication capacity, thereby avoiding additional costs for more base stations or high-performance models.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If transmission right allocation control is performed sequentially, then interference between base stations is prevented, but transmission efficiency deteriorates due to control overhead

Engineering Contradiction:

Improveinterference preventionVSAvoidtransmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system implements periodic exchange of scheduling information between radio base stations at predetermined intervals. This periodic coordination allows base stations to maintain interference-free operations while minimizing control overhead, as the scheduling information is updated only when necessary rather than continuously, thereby preserving transmission efficiency.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS7869829B2Radio communication system, including a plurality of radio base stations, radio base station, radio communication method, and computer readable medium for radio communication system

Publication Date: 2011.01.11 NEC PLATFROMS LTD

AI summary

The present invention increases, even while transmission rights are not being allocated to respective radio communication terminals, a maximum number of simultaneous connections within a communication capacity range of a communication frequency set in advance, reduce a waiting time, and increase speed of communication without causing an increase in cost for addition of radio base stations, replacement with a high-performance model, and the like. A radio base station 2a calculates a guard time based on beacon transmission timing from a difference between reference times in beacon transmission, and transmission and reception time frame information based on beacon transmission timing of a radio base station 2b. In other words, the radio base station 2a calculates a guard time based on beacon transmission timing to prevent overlap of a transmission and reception time frame of transmission and reception to and from a radio communication terminal 3 belonging to the radio base station 2b, and transmission and reception timing of transmission and reception to and from a radio communication terminal 3 belonging to the radio base station 2a.