Gain Factor Setting for Stand-Alone E-DCH in WCDMA

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In asynchronous WCDMA communication systems, there is a need for determining the transmit power of enhanced dedicated physical channels, especially when the Dedicated Channel (DCH) is not established, as existing methods rely on the DCH for power determination, which is not feasible in stand-alone Enhanced DCH (E-DCH) scenarios.

Innovation Solution

A method and apparatus for setting gain factors for dedicated physical channels, where the transmit power is determined based on channel configuration information, with a predetermined constant used if the DCH is not configured, allowing for independent power setting of enhanced dedicated physical channels like E-DPDCH and E-DPCCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the DCH is not configured, then stand-alone E-DCH operations can be supported, but the transmit power cannot be determined using existing methods that rely on DCH

Engineering Contradiction:

Improvestand-alone E-DCH operation capabilityVSAvoidtransmit power determination

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a reference signal (DPCCH or pilot signal) as an intermediary to enable transmit power determination for E-DPDCH when DCH is not configured. The gain factor is calculated relative to this reference signal's power, allowing power control without requiring DCH configuration.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the parameter used for power determination from DCH-based parameters to E-DCH-specific parameters (gain factor relative to DPCCH or pilot signal). This parameter change enables stand-alone E-DCH operation by shifting the reference point for power calculation.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the gain factor is calculated using DCH parameters, then power control is accurate for DCH-based systems, but it becomes infeasible for stand-alone E-DCH scenarios

Engineering Contradiction:

Improvepower control accuracyVSAvoidapplicability to stand-alone E-DCH

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent makes the power determination method dynamic by detecting whether DCH is configured and switching between two different calculation methods: using DCH parameters when available, or using DPCCH/pilot signal parameters when DCH is not configured. This dynamic adaptation maintains both accuracy and versatility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal power determination mechanism that functions in both DCH-based and stand-alone E-DCH scenarios. The gain factor calculation is designed to work with either DCH parameters or DPCCH/pilot signal parameters, making the system multi-functional and broadly applicable.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS7606212B2Method and apparatus for setting gain factors for dedicated physical channels in a mobile telecommunications system

Publication Date: 2009.10.20 SAMSUNG ELECTRONICS CO LTD

AI summary

A system and method are provided for setting gain factors for dedicated physical channels in a mobile communication system supporting E-DCH service. If the E-DCH is established without the legacy DCH, the UE sets a gain factor for a DPCCH related to the DCH to a predetermined constant and calculates gain factors for dedicated physical channels related to the E-DCH using the gain factor of the DPCCH. In another embodiment of the present invention, if the E-DCH is established without the legacy DCH, the RNC sets a gain factor for a DPCCH related to a virtual DCH to a predetermined constant and sends channel configuration information including the gain factor to the UE.