Fast Power Congestion Control WCDMA

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

WCDMA RAN

Fast Power Congestion Control Feature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.

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WCDMA RAN

Fast Power Congestion Control Contents

Issue 01 (2011-04-30) Huawei Proprietary and Confidential


i

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Technical Description .............................................................................................................. 3-1

4 Parameters.................................................................................................................................. 4-1

5 Counters ...................................................................................................................................... 5-1

6 Glossary ...................................................................................................................................... 6-1

7 Reference Documents ............................................................................................................. 7-1

WCDMA RAN

Fast Power Congestion Control 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes the Fast Power Congestion Control feature (WRFD-010208 Fast Power Congestion Control (FCC)).

1.2 Intended Audience

This document is intended for:

Personnel who are familiar with WCDMA basics

Personnel who need to understand the Fast Power Congestion Control feature

Personnel who work with Huawei products

1.3 Change History

This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to the change in the Fast Power Congestion Control feature.

Editorial change: refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues

The document issues are as follows:

01 (2011-04-30)

Draft B (2011-03-30)

Draft A (2010-12-30)

01 (2011-04-30)

This is the document for the first commercial release of RAN13.0.

Compared with issue Draft B (2011-03-30) of RAN13.0, this issue has no change.

Draft B (2011-03-30)

This is the draft of the document for RAN13.0.

Compared with Draft A (2010-12-30) of RAN13.0, this issue has no changes.

Draft A (2010-12-30)

This is the draft of the document for RAN13.0.

Compared with issue 01 (2010-03-30) of RAN12.0, this issue optimizes the description.

WCDMA RAN

Fast Power Congestion Control 2 Overview



2-1

2 Overview

Fast power congestion control (FCC) is implemented on the NodeB side. This feature aims to quickly rectify the system overload situation to prevent the output power from exceeding the maximum power allowed by hardware.

This feature enables efficient utilization of power amplifiers for traffic load, especially for dynamic power sharing in one carrier between R99 and HSDPA.

WCDMA RAN

Fast Power Congestion Control 3 Technical Description



3-1

3 Technical Description

FCC is a NodeB function that complements RNC congestion control. The function monitors the output power per slot that all users demand at the same time, using the real time scale as the fast power control function.

Huawei provides the DL automatic level control (ALC) function for fast power congestion control in the NodeB, in order to limit output power and avoid PA saturation. The ALC monitors the transmit power in real time. When the input power reaches or exceeds the predefined threshold, the ALC can decrease the signals on TX channels by increase attenuation to keep the output power lower than the threshold, thus avoiding PA saturation.

The NodeB uses FCC to quickly control the output power, the control reaction time is 1024 chips, which is fast enough to fully prevent saturation of the TX chain or overdriving of PAs without the need for power margins.

Therefore, when a cell is heavily loaded, its performance remains robust, without the risk of call drops or inaccurate modulation. In addition, the RNC congestion and admission thresholds can be set to higher levels, which increase cell capacity without compromising overall quality of service.

WCDMA RAN

Fast Power Congestion Control 4 Parameters



4-1

4 Parameters

There are no specific parameters associated with this feature.

WCDMA RAN

Fast Power Congestion Control 5 Counters



5-1

5 Counters

There are no specific counters associated with this feature.

WCDMA RAN

Fast Power Congestion Control 6 Glossary



6-1

6 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

WCDMA RAN

Fast Power Congestion Control 7 Reference Documents



7-1

7 Reference Documents

There are no specific reference documents associated with this feature.

Fast Power Congestion Control WCDMA

Documents

Transcript of Fast Power Congestion Control WCDMA