WiMAX 16e Capacity Planning

WiMAX 16e Capacity Planning

HUAWEI TECHNOLOGIES CO., LTD.

www. huawei. com

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WiMAX Capacity Planning Process

WiMAX BS Capacity Analysis

WiMAX 16e Traffic Model Analysis

WiMAX 16e Capacity planning

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.

Capacity Planning Purpose

÷ =

The purpose of capacity planning: Site number and Site configure

Total users Users supported per site Site number required


Capacity Planning Process

Total users Users supported per siteSite number required = ÷

Users supported per site = Average throughput per site

÷ Average throughput per User

BTS


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Average capacity Analysis

16QAM

64QAM

QPSK

25%~30%

65%~70%

The Average capacity per sector = x%*Throughput of QPSK 1/2 + x%* Throughput of QPSK 3/4 + … + x%* Throughput of QAM64 5/6

Max Bit Rate per Sector (Mbps)

DL

Physical MAC

QPSK 1/2 3.710 3.676

QPSK 3/4 5.564 5.531

QAM16 1/2 7.419 7.386

QAM16 3/4 11.129 11.095

QAM64 1/2 11.129 11.095

QAM64 2/3 14.838 14.805

QAM64 3/4 16.693 16.660

QAM64 5/6 18.548 18.514

10MHz channel bandwidthTDD Ratio ＝ 32:15

How much of x% ???

Base on the CINR distribution and Users distribution


Average capacity base on the simulation

The throughput supplied is based on the network simulation, the process is introduced below, which is based on the Monte Carlo Simulation;

1, Deploy the subscribers in random and uniformly;

2, Calculate the path loss depend on the location of the subscribers and sites;

3, Determine the best server cell for each subscribers;

4, Calculate the CINR for each subscribers both in downlink and uplink; which decide the MCS selection;

5, Calculate the frequency efficiency for each cell based on the CINR of subscribers;

6, Get the statistic of the final throughput for each site;

7, Repeat the steps above;

Average Throughput per Site

Channel bandwidth 10MHz

Frequency reuse 1*3*3

TDD Time Scale DL:UL=32:15

　 DL(Mbps) UL(Mbps)

Average Capacity per S111 site 42.54 10.38

Example:


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WiMAX 16e Service Model PrincipleService Type: WEB A session is equal to

browsing a web site. A packet call is equal to browsing a web page in the website. Reading time is the time for reading all or partial contents of the web page.

Active Ratio: No. of online or active subscribers / No. of total subscribers

Duty Ratio: The ratio of working time to total time for an intermittently operating device, usually expressed as a percent. Also known as

duty factor. Overbooking = Active Ratio * Duty Ratio

Data rate: Average data rate when the data is transmitted

Typical Service Duty Ratio

Internet/HTTP 10%

Video 80%

FTP 40&

Game 30%

Typical value of Duty Ratio

WiMAX 16e Service Model in WiMAX ForumTraffic Model Definition from WiMAX Forum For Reference

The Average throughput per user calculation:

Average throughput per user DL = 50%*1/5*25%*600+35%*1/7*25%*480+15%*1/20*25%*240

= 21.45kbps

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Case - Average throughput per user

Item Value

Overbooking 10%

Average DL data rate 1024kbps

Average UL data rate 256kbps

The Average throughput per user calculation:

Average throughput per user DL = Average DL data rate * Overbooking

= 1024kbps*10%

=102.4kbps

Average throughput per user UL = Average UL data rate * Overbooking

= 256kbps*10%

=25.6kbps

Assumed Traffic Model

HUAWEI TECHNOLOGIES Co., Ltd.

Case - Base station capacity and site planningCase - Base station capacity and site planning

Formula: Users supported per site = Average Capacity per site / Average throughput per user

Average Throughput per Site

Channel bandwidth 10MHz

Frequency reuse 1*3*3

TDD Time Scale DL:UL=31:15

　 DL(Mbps) UL(Mbps)

Average Capacity per S111 site 42.54 10.38

　 DL UL

Users supported per S111 site 425 415

Site number by Capacity = Total uses / Users supported per site

Thank You

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WiMAX 16e Service Module Principle

Type 1: interactive game module

Define parameters of a session: packet call, reading time, packet arrival interval, mean data rate of package call.

Simplified module

WiMAX 16e Service Model PrincipleType 2: VoIP and video meeting

Various applications such as voice, video and data, form video meeting service frames through different protocol stacks.

Considering single voice user, the entire service period falls into OFF and ON periods. In the ON period, users send fixed size packet in fixed time and generate voice data. In the OFF period, no data is generated.

WiMAX 16e Service Model Principle

Type 3: Streaming media

Each frame of the video data arrives at the destination in specified time interval (T). Each frame can be divided into data splits of fixed amount. The size of data split is dependent on the cut Pareto distribution.

The parameter T is dependent on the data frame amount of each second. Dc is the delay that the video coder introduced to the 1-frame data split (packet data). The delay period also conforms to the cut Pareto distribution. TB is the de-jitter cache data window that the receiver sets to ensure the consecutive display video stream.

WiMAX 16e Service Model PrincipleType 4: WEB and IM

A session is equal to browsing a web site. A packet call is equal to browsing a web page in the website. Reading time is the time for reading all or partial contents of the web page.

Instant message falls into instant text message and instant multi-media message.

WiMAX 16e Service Model PrincipleType 5: FTP and E-Mail

FTP: Users include file technology working personnel with large common FTP transmission and users rarely use FTP. An FTP transmission has several files. The time interval between file transmission is the reading time.

E-Mail: Users include the technical working personnel using large mail attachment and the users rarely use mails. The maximum e-mail attachment cannot exceed a certain limit, such as 20M bytes. Most email servers limit the email size, including the attachment size.

PCD

WiMAX 16e Capacity Planning

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