Line Control Device for Wireless Band Allocation

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Solution Overview

Problem

In wireless communication systems where a primary system with continuous band allocation and a secondary system performing spectrum division transmission share a frequency band, the secondary system's use of unused bands can lead to a situation where continuous bands cannot be secured for the primary system, affecting its operation efficiency and operability.

Innovation Solution

A line control apparatus that identifies the use status of both systems' frequency bands and prioritizes the allocation of shared bands to the primary system, releasing allocated bands from the secondary system's terminal stations as needed to ensure continuous band allocation to the primary system, and performing line disconnection if no unused bands are available.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the secondary system uses unused bands for spectrum division transmission, then spectral efficiency is improved, but continuous bands cannot be secured for the primary system

Engineering Contradiction:

Improvespectral efficiencyVSAvoidcontinuous band availability for primary system

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The line control apparatus performs preliminary identification of the use status of both shared and unshared bands before allocation decisions are made. This preliminary action enables the system to proactively secure continuous bands for the primary system while still allowing the secondary system to utilize unused bands, thereby preventing the contradiction from arising in the first place.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The line control apparatus acts as an intermediary between the primary and secondary systems. It manages the shared bands by identifying use status and controlling allocation priorities, ensuring that the primary system's continuous band requirements are met while the secondary system can still access unused bands for spectrum division transmission.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If shared bands are allocated to the secondary system, then the secondary system can perform spectrum division transmission, but the primary system cannot secure requested bands

Engineering Contradiction:

Improvesecondary system's ability to use shared bandsVSAvoidprimary system's band allocation capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The line control apparatus performs preliminary identification of band use status before allocation requests are processed. This allows the system to pre-determine which bands are available for the primary system and which can be allocated to the secondary system, ensuring smooth operation for both systems without conflicts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the allocation parameter by introducing priority levels based on system type. The primary system is given higher priority for continuous band allocation in shared bands, while the secondary system can access unused bands. This parameter change resolves the contradiction by adjusting allocation rules rather than physically changing the bands.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If demand allocation method is used to dynamically allocate bands, then bandwidth utilization is improved, but discontinuous open bands are created

Engineering Contradiction:

Improvebandwidth utilizationVSAvoidcontinuity of allocated bands

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The frequency band is segmented into shared bands and unshared bands, with different allocation rules applied to each segment. The shared bands are reserved for primary system continuous allocation, while unshared bands can be dynamically allocated to the secondary system. This segmentation allows both continuous availability for the primary system and flexible utilization for the secondary system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different allocation qualities are applied to different parts of the frequency spectrum. Shared bands maintain continuous allocation quality for the primary system, while unshared bands allow dynamic allocation quality for the secondary system. This local differentiation resolves the contradiction between bandwidth utilization and band continuity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11902795B2Line control device, line control method, and line control program

Publication Date: 2024.02.13 NIPPON TELEGRAPH & TELEPHONE CORP

AI summary

In a line control apparatus including a shared band in which first and second frequency bands used by first and second wireless communication systems, respectively, overlap with each other and allocating the first and second frequency bands including the shared band to terminal stations of the respective wireless communication systems, the line control apparatus includes a control unit configured to identify a use status of the first and second frequency bands, and release an allocated band of a terminal station of the second wireless communication system, the terminal station being a minimum terminal station necessary, in a case where a terminal station of the first wireless communication system performs a new band allocation request, and a requested band by the first wireless communication system is not secured due to allocation of the shared band to the terminal station of the second wireless communication system, until the requested band is secured.