Default E-DCH Resource Configuration Determination

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Solution Overview

Problem

The E-RACH system faces inefficiencies due to the lack of a defined method for allocating default E-DCH resource configurations, leading to increased downlink control information and potential collisions, especially when base stations do not support E-AICH.

Innovation Solution

A method where the base station determines a default resource configuration using the total number of resource configurations or a value derived from it, allowing mobile stations to transmit data using this configuration upon receiving a first response, thereby reducing the need for extensive broadcast information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a default E-DCH resource configuration allocation method is not defined, then mobile stations can transmit data using E-RACH, but downlink control information increases and collisions occur

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoiddownlink control information

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The mobile station autonomously determines its default E-DCH resource configuration by calculating the remainder when dividing the number of the first code channel assigned in a previous RACH process by the total number of E-DCH resource configurations. This self-service mechanism eliminates the need for the base station to broadcast default configuration information, thereby reducing downlink control information while maintaining efficient data transmission

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system pre-establishes a deterministic relationship between code channel numbers and E-DCH resource configuration indices. When a mobile station receives a code channel assignment in a previous RACH process, it can preliminarily determine its default E-DCH resource configuration without requiring additional broadcast information, thus preventing information loss and reducing control overhead

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If base stations do not support E-AICH, then E-DCH resource configuration cannot be allocated, but mobile stations need to transmit data

Engineering Contradiction:

Improvecompatibility with non-E-AICH base stationsVSAvoiddata transmission capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

Mobile stations autonomously determine their default E-DCH resource configuration by calculating the remainder when dividing their assigned code channel number by the total number of E-DCH resource configurations. This self-service capability enables data transmission without requiring E-AICH support from the base station, thereby improving compatibility while maintaining ease of operation

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention creates a universal mechanism that works with both E-AICH and non-E-AICH base stations. By establishing a deterministic calculation method for default E-DCH resource configuration that does not depend on E-AICH, the system achieves multi-functionality and broad compatibility across different base station types

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If default E-DCH resource configurations are allocated without a defined method, then resource allocation flexibility is maintained, but collisions increase

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidcollision avoidance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system uses feedback from previous RACH processes (code channel assignments) to deterministically determine default E-DCH resource configurations. This feedback mechanism ensures that mobile stations with different code channel numbers will calculate different E-DCH resource configuration indices, thereby reducing collisions while maintaining allocation efficiency

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The invention changes the parameter used for resource configuration determination from arbitrary or broadcast-based values to a deterministic calculation based on code channel numbers. By using the formula (code channel number) mod (total number of E-DCH resource configurations), the system transforms resource allocation into a parameter-driven process that reduces collisions while maintaining flexibility

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11638241B2Communication system, mobile station, base station, response decision method, resource configuration decision method, and program

Publication Date: 2023.04.25 NEC CORP

AI summary

It is possible to solve the problem that a downstream control information amount is significantly increased if allocation information is periodically reported because no allocation method of a default E-DCH resource configuration is defined for a preamble signature. A base station and a mobile station decide a default resource configuration by using a total number of resource configurations or a value obtained from the total number.