Secondary User Apparatus Directional Channel Selection

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Solution Overview

Problem

Existing radio coexistence systems face challenges in efficiently arranging the use of radio channels between primary and secondary users, where primary users have priority, due to interference limitations that restrict the usage of radio bandwidth for secondary users.

Innovation Solution

A method where a secondary user apparatus detects interference limitations on a radio channel with a primary user's priority and selects alternative channels for one-directional communication to avoid causing harmful interference, allowing for more efficient use of the radio spectrum.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If secondary users are allowed to use radio channels with primary users, then spectrum utilization efficiency is improved, but interference to primary users increases

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidinterference to primary users

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The radio channel is segmented into different spatial directions (first direction and second direction opposite thereto). The secondary user apparatus transmits signals in one direction while receiving in the opposite direction, dividing the channel usage into directional segments to avoid interfering with primary users in other directions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The secondary user apparatus applies different operations to different directions: transmitting in the first direction and receiving in the second direction. This local differentiation allows the system to optimize spectrum usage in each direction while protecting primary users from interference in their specific spatial zones

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If secondary users avoid channels with primary users, then interference to primary users is reduced, but spectrum utilization efficiency deteriorates

Engineering Contradiction:

Improveinterference to primary usersVSAvoidspectrum utilization efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The system transitions from frequency-only channel allocation to spatial-frequency domain allocation by introducing directional information. The secondary user apparatus uses the first radio channel in the first direction and second radio channel in the second direction, adding a spatial dimension to channel access and enabling more efficient spectrum utilization without increasing interference

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS9521656B2Method and apparatus for using radio channels

Publication Date: 2016.12.13 NOKIA TECHNOLOGIES OY

AI summary

In a non-limiting and example embodiment, a method is provided for controlling usage of prioritized radio channels, comprising: detecting (310), by a secondary user apparatus, an interference limitation of a first radio channel for which a primary user apparatus has priority over the secondary user apparatus, selecting (320), by the secondary user apparatus, the first radio channel for communication with another apparatus to a first direction after detecting the interference limitation, and selecting (330), by the secondary user apparatus, a second radio channel for communication with the other apparatus to a second direction, opposite to the first direction.