MRU User's Manual

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Mobile Receiving Unit

Users Manual


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This manual is provided by Ascom Network Testing AB without any kind of

warranty. Improvements and changes in this description due to typographical

errors or inaccuracies in current information, or improvements to programs

and/or equipment may be made by Ascom Network Testing AB at any time

without notice. These changes will, however, be incorporated into new

editions of this manual.

No part of this publication may be reproduced, transmitted, stored in a

retrieval system, nor translated into any human or computer language, in any

form or by any means, electronic, mechanical, magnetic, optical, chemical,

manual or otherwise, without the prior written permission of the copyrighted

owner, Ascom Network Testing AB.

TEMS is a trademark of Ascom.

All other trademarks are the property of their respective holders.

Ascom 2010. All rights reserved.

Publication number: LZT 108 9939 R1C


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Contents

LZT 108 9939 R1C i

Contents

1. Introduction 1

1.1. What Is MRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2. Prerequisites For Using MRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3. Battery Charging Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.3.1. Choice of Phone Charger. . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.2. The Charging Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2. Using MRU 4

2.1. Switching On The MRU Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2. Locking On RAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Index 9


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Mobile Receiving Unit (MRU) Users Manual

ii


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Chapter 1. Introduction

LZT 108 9939 R1C 1

1. Introduction

The purpose of this users manual is to describe how to use the feature

Mobile Receiving Unit (MRU) in the mobile phone where it is implemented.

1.1. What Is MRU

MRU is the unit involved in mobile to mobile PESQ measurements, in a

TEMS Automatic system or with TEMS Investigation.

When the MRU feature is switched on (from the mobile phone menu or from

TEMS Investigation), the MRU automatically answers incoming calls and

starts to play PESQ sentences. The AQM module in the RTU/MTU (for TEMS

Automatic) or in the TEMS Investigation case measures and calculates on

downlink the PESQ values for these sentences. The PESQ values can then

be monitored and analyzed in TEMS Presentation.

The MRU can be locked on a certain RAT (GSM or WCDMA) from the mobile

phone menu.


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2

1.2. Prerequisites For Using MRU

To avoid disturbances in the PESQ measurements, there are a couple of

items to consider:

Accessories can not be used during the measurements. That means no

headset, no external speakers, etc, can be connected to the MRU.

The service Call waiting must be deactivated. That is done through the

mobile phone menu (Settings Calls Manage calls Call waiting

Deactivate).

The MRU should be placed in an environment with good radio quality. It is

thus not recommended to use the MRU in a vehicle.

1.3. Battery Charging Considerations

Some specific advice on battery charging related matters is given below.

1.3.1. Choice of Phone Charger

When engaging the phone in highly power-consuming tasks, you should

always use the regular phone charger. The USB charger which is also

provided with the phone is only about one third as powerful, which may beinsufficient when running the MRU feature.

1.3.2. The Charging Operation

You must take special steps to ensure that the phone battery is not drained.

To understand why, it is first necessary to explain how the battery charging in

the phone works.

First we need to define the end-of-charge(EoC) state for the battery. This is astate where the battery is regarded as fully charged by the phones charging

algorithm. The precise details need not bother us; however, and crucially, the

method of testing whether the EoC state has been reached is to measure the

average current flowing to/from the battery over a period of time.

Now, if the MRU is playing PESQ sentences frequently (executing orders

initiated from a command sequence in TEMS Investigation or from a work

order in TEMS Automatic), the phone will be switching frequently between

idle and dedicated mode. This in turn means that the current to the battery

will not be constant enough for the EoC state ever to be reached. Even if the


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Chapter 1. Introduction

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battery charge level remains high at all times (for example, above 90%), the

charging algorithm will never consider the battery to be fully charged.

Since prolonged charging of the battery increases the risk of battery failure,

the charging algorithm has a safety timer that disables the charger after fourhours if the battery has failed to reach the EoC state within this time. If this

happens, the phone will run on batteries until the charger is disconnected and

reconnected, or until the phone is power cycled. If neither of these actions is

performed, and the MRU is still executing orders, the battery will be drained in

a fairly short time.

For example, suppose that the following has to be executed:

PESQ sentence to be played

Call duration = 30 s Guard time = 30 s

The phone performs charging in idle mode only, unless the battery charge is

low. In the above case, the phone is idle about 50% of the time, so after about

4 2 = 8 hours the safety timer expires and the charger is disabled. After that

the phone runs on battery power only, and tests using a battery in near mint

condition have shown that the battery is then drained in about 4 hours.

To prevent this situation from arising, you have two options:

One way is to disable the playing of PESQ sentences for a while (beforethe safety timer expires) to give the phone an unbroken stretch of time in

idle mode and allow the battery to reach the EoC state. Note, however,

that the length of the break required depends on the settings in the

command sequence or work order, and on the general condition of the

battery. In the above test case, an idle mode period of 1520 minutes was

required, but in other circumstances more time may be needed.

Another approach is simply to make sure you disconnect the battery

charger physically from the phone (or unplug the charger from its power

source) before the battery is drained, and then reconnect the charger.

The latter option is the only completely safe one, and it is therefore

recommended.


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2. Using MRU

2.1. Switching On The MRU Feature

Make sure you have no accessories connected to the mobile phone and that

Call waiting is deactivated (see section 1.2. Prerequisites For Using MRU).

To switch on the MRU feature in the mobile phone, you enter the ordinary

mobile phone menu and select Settings.

Under General tab, select MRU menu and click Select.


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Chapter 2. Using MRU

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In the MRU menu, select MRU mode and click Select.

In MRU mode, select MRU on and click Select. Now the MRU feature is

switched on, which means that MRU will automatically answer all incoming

calls and start to play PESQ sentences.

The call is normally disconnected by the AQM module in TEMS Automatic or

TEMS Investigation. If the call has not been disconnected by the AQM

module after one hour, the call is disconnected by the MRU to avoid hangings

in the network or fraud calls.


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To switch off the MRU feature, you make the same menu selections as

described for switching it on, but you select MRU off in the MRU mode menu.

2.2. Locking On RAT

You can lock the mobile phone, and thus the MRU, on a certain Radio Access

Technology (RAT). One purpose is to be able to compare PESQ values

between the different RATs.

To lock on a certain RAT (and also to unlock from a locked RAT), you enter

the ordinary mobile phone menu and select Settings.

Under General tab, select MRU menu and click Select.


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Chapter 2. Using MRU

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In the MRU menu, select Lock to RAT and click Select.

In the Lock to RAT menu, select the desired technology (or Off, to unlock) and

click Select. The previous MRU menu will appear with Lock to RAT option

chosen.

Your MRU feature (and thus the mobile phone) will now be locked on your

desired technology (or unlocked, if you selected Off). From here, you can

either exit the menu or enter MRU mode and switch on (enable) the MRU

(see section 2.1. Switching On The MRU Feature).


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Index

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Index

Bbattery charging considerations 2

Llock on RAT 6

Pprerequisites 2

Sswitching on the MRU feature 4

Uusing the MRU 4

Wwhat is MRU 1


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