Secondary Pilot Channel Manager for HS-DPCCH Demodulation

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Solution Overview

Problem

In wireless communication systems, particularly in LTE and other multi-access technologies, the uplink high-speed dedicated physical control channel (HS-DPCCH) experiences unreliable demodulation due to severe imbalances in downlink and uplink path loss between user equipment (UE) and cells, leading to fluctuating SINR and ineffective power control.

Innovation Solution

The implementation of a secondary pilot channel manager that receives and demodulates the HS-DPCCH using a secondary pilot channel, which is power controlled by the serving cell, thereby improving demodulation reliability by using it as a phase reference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the UE transmit power is power controlled by a non-serving cell, then the downlink path loss balance is improved, but the uplink HS-DPCCH demodulation reliability deteriorates due to fluctuating SINR at the serving cell

Engineering Contradiction:

Improvedownlink path loss balanceVSAvoiduplink HS-DPCCH demodulation reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent separates the power control functions for different cells. The serving cell and non-serving cell independently control the UE's pilot channel power, allowing each cell to optimize its own link conditions without interfering with the other's demodulation reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a secondary pilot channel as an intermediary reference signal. This secondary pilot is specifically power-controlled by the serving cell to provide a stable phase reference for HS-DPCCH demodulation, decoupling the demodulation reliability from the fluctuations caused by non-serving cell power control

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the UE transmit power is reduced to balance downlink path loss, then the downlink resource allocation efficiency is improved, but the uplink SINR at the serving cell becomes too low for reliable HS-DPCCH demodulation

Engineering Contradiction:

Improvedownlink resource allocation efficiencyVSAvoiduplink HS-DPCCH demodulation reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies different power control strategies to different channels. The primary pilot channel follows downlink path loss balance control, while the secondary pilot channel receives additional power control from the serving cell to ensure sufficient uplink SINR for HS-DPCCH demodulation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the power control parameters for the secondary pilot channel specifically. The serving cell adjusts the secondary pilot's transmit power independently to maintain adequate uplink SINR, while allowing the primary pilot to follow the downlink path loss balance strategy

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9232509B2Apparatus and methods for improving demodulation reliability of an uplink high speed-dedicated physical control channel

Publication Date: 2016.01.05 QUALCOMM INC

AI summary

The present disclosure presents a method and apparatus for improving demodulation reliability of an uplink (UL) high speed dedicated physical control channel (HS-DPCCH) at a base station. For example, the disclosure presents a method for receiving a secondary pilot channel from a user equipment (UE) on an uplink (UL) and demodulating the HS-DPCCH using at least the secondary pilot channel. As such, improved demodulation reliability of an uplink (UL) high speed dedicated physical control channel (HS-DPCCH) at a base station may be achieved.