Coordinated Random Access Trigger Frame Resource Selection

Solution Overview

Problem

Current coordinated random access procedures in wireless communication networks, particularly for OFDMA technology, face performance issues with terminals at the edge of the radio range or with limited transmission capabilities, leading to inefficiencies in medium access and increased collisions.

Innovation Solution

The method involves including information in coordinated random access trigger frames about frequency resource selection methods, such as random or free selection, along with transmission power and modulation schemes, allowing terminals to dynamically choose resources that suit their conditions, and the access point collects statistics to optimize resource allocation and reduce collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a random frequency resource selection method is used in coordinated random access, then collision probability is reduced, but transmission performance for terminals at radio range limit deteriorates

Engineering Contradiction:

Improvecollision probabilityVSAvoidtransmission performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements dynamic frequency resource selection where terminals can switch between random selection and free selection methods based on their transmission conditions. Terminals at radio range limit with poor channel conditions use random selection to avoid collisions, while terminals with good channel conditions use free selection to maximize transmission performance. This dynamic adaptation resolves the contradiction by allowing each terminal to choose the appropriate method for its specific situation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different frequency resource selection methods to different terminals based on their local conditions. Terminals are categorized into different groups (e.g., first set for random selection, second set for free selection) according to their radio range position and transmission capabilities. This localized approach ensures that each terminal uses the method most suitable for its specific environment, resolving the contradiction between collision avoidance and transmission performance.

Inventive Principle:

Principle #3Local quality

2Productivity

If a free frequency resource selection method is used, then transmission performance improves, but collision probability increases

Engineering Contradiction:

Improvetransmission performanceVSAvoidcollision probability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements dynamic frequency resource selection where terminals can switch between random selection and free selection methods based on their transmission conditions. Terminals at radio range limit with poor channel conditions use random selection to avoid collisions, while terminals with good channel conditions use free selection to maximize transmission performance. This dynamic adaptation resolves the contradiction by allowing each terminal to choose the appropriate method for its specific situation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies different frequency resource selection methods to different terminals based on their local conditions. Terminals are categorized into different groups (e.g., first set for random selection, second set for free selection) according to their radio range position and transmission capabilities. This localized approach ensures that each terminal uses the method most suitable for its specific environment, resolving the contradiction between collision avoidance and transmission performance.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If coordinated random access procedure is used, then medium access control is improved, but complexity of resource allocation increases

Engineering Contradiction:

Improvemedium access controlVSAvoidresource allocation complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent segments the terminal population into different sets based on their transmission conditions and applies different frequency resource selection methods to each segment. The access point categorizes terminals (e.g., first set for random selection, second set for free selection) and manages resource allocation separately for each group. This segmentation simplifies the overall resource allocation complexity by breaking it down into manageable subsets with different strategies.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies full coordinated resource allocation only when necessary (for terminals in the first set with poor channel conditions), while allowing terminals in the second set to perform free selection with minimal access point intervention. This partial coordination approach reduces the overall complexity of resource allocation while still providing medium access control where it is most needed.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP3510826B1Procedure for coordinated random access to a wireless communication network

Publication Date: 2021.04.21 SAGEMCOM BROADBAND SAS

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AI summary

An access point of a wireless communication network to which a plurality of terminals is connected transmits frames for triggering a coordinated random access procedure, thereby providing an opportunity for access to the medium of the wireless communication network at each terminal which is to receive said frame. Each terminal that seizes the medium access opportunity performs an OFDMA-type ascending transmission in response to said frame. The access point (303, 308) includes, in each frame for triggering a coordinated random access procedure, information representing a method for selecting frequential resources out of a random selection method and a free selection method.