SYMEO LPR-2DB Operator's manual
SYMEO LPR®
Product: LPR®-2DB
Product Documentation
Symeo LPR®-System
LPR®-2DB
Product Documentation
General
Copyright © Symeo 2012
Page 2 of 132
CONTENT
1GENERAL ........................................................................................................9
1.1 Safety Instructions................................................................................................... 9
1.2 Installation............................................................................................................... 9
1.3 Repairs.................................................................................................................... 9
1.4 Transport and Storage ............................................................................................ 9
1.5 Power Supply.........................................................................................................10
1.6 Setup and Operation..............................................................................................10
1.7 System Extensions and Accessories......................................................................10
1.8 Additional Instructions Regarding Compact Type and Integral Type Stations.........11
2INTRODUCTION ............................................................................................12
2.1 Details....................................................................................................................12
2.2 Overview of Files....................................................................................................12
2.3 Project Planning.....................................................................................................15
3SYSTEM DESCRIPTION................................................................................18
3.1 Technical Data.......................................................................................................18
3.2 Operating Mode .....................................................................................................19
3.2.1 Operation Mode 1: Basic Cell..........................................................................19
3.2.2 Operation Mode 2: Managed Cell....................................................................20
3.2.3 Operation Mode 3: TDOA................................................................................21
3.3 Vehicle Model.........................................................................................................22
3.3.1 Hover-Track....................................................................................................23
3.3.2 Vehicle-Track..................................................................................................23
3.4 System Design.......................................................................................................23
3.4.1 2D Positioning.................................................................................................24
4HARDWARE...................................................................................................26
4.1 System components –Overview............................................................................26
4.2 LPR-2DB Station (mobile station)...........................................................................26
4.2.1 Overview compact station...............................................................................26
4.2.2 Technical data compact station.......................................................................26
4.2.3 Station BSB000313, BSB000319....................................................................27
4.2.4 Station BSB000603, BSB000604, BSB000605, BSB000606...........................28
4.2.5 Lumberg Connector Type 0233 08..................................................................29
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4.3 Cables for Compact Station....................................................................................29
4.3.1 Cable for Power Supply...................................................................................29
4.3.2 Recommended Cable Types HARTING Push Pull Connector.........................31
4.4 Connector box........................................................................................................31
4.4.1 Example: Connector Box.................................................................................32
4.5 LPR-2DB Integral Station (fixed mounted unit).......................................................33
4.5.1 Technical Data: LPR-2DB Integral Station.......................................................33
4.5.2 Components of LPR-2DB Integral Station.......................................................34
4.6 LPR Antennas for Compact Station (mobile unit) ...................................................34
4.6.1 Mounting devices of LPR Antennas.................................................................35
5INSTALLATION..............................................................................................37
5.1 Installation of the LPR-2DB Station (mobile unit)....................................................37
5.2 Installation of the LPR-2DB Integral Station ...........................................................38
5.2.1 Electrical Interface...........................................................................................38
5.2.2 Installation.......................................................................................................39
5.2.3 Allocation of LPR-2DB Integral Stations and Installation Points.......................41
5.3 Installation of LPR antennas...................................................................................41
5.3.1 Connection of antenna cables to the mobile units (LPR-2DB Station).............41
5.3.2 Mounting of LPR antennas..............................................................................42
5.3.3 Notes for mounting position of LPR antennas on the mobile unit.....................43
6COORDINATE SYSTEM................................................................................46
6.1 Survey Instructions for the LPR-2DB Integral Station.............................................46
6.1.1 Coordinate system of LPR-2DB Integral Station..............................................46
6.1.2 Reference point of LPR-2DB Integral Station..................................................47
6.1.3 Orientation of LPR-2DB Integral Station..........................................................48
6.1.4 Formatting of coordinates................................................................................49
6.2 Surveying of LPR-2DB Compact Station on mobile unit.........................................50
6.2.1 Reference system for vehicle type: forklift.......................................................50
6.2.2 Reference system for vehicle type: Van Carrier...............................................50
6.2.3 Reference system for vehicle type: passenger car..........................................51
6.2.4 Reference system for vehicle type: crane/ trolley ............................................52
6.3 Surveying of LPR antennas....................................................................................52
6.3.1 Formatting of coordinates................................................................................53
7COMMISSIONING..........................................................................................55
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LPR®-2DB
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7.1 Check list installation and surveying.......................................................................55
7.1.1 Cells, Integral stations.....................................................................................55
7.1.2 LPR-2DB Station (Mobile units).......................................................................56
7.1.3 Formatting of coordinates................................................................................56
7.1.4 Folders structure.............................................................................................56
7.2 Editing of configuration files for the DSP ................................................................56
7.2.1 File basestation_config.txt...............................................................................57
7.2.2 File stationXXM_config.txt...............................................................................57
7.2.3 File stationXXY_config.txt ...............................................................................58
7.3 Upload of configuration files for the DSP................................................................58
7.3.1 Connection with LPR mobile unit (type: compact) via TCP/IP..........................59
7.3.2 Connection with LPR mobile unit (type: compact) via RS232..........................60
7.3.3 Upload DSP configuration file for LPR mobile unit (base station) ....................61
7.3.4 Upload DSP configuration file for master transponder unit ..............................62
7.3.5 Upload DSP configuration file for transponder unit..........................................65
7.4 Editing of configuration files for Fusion Engine.......................................................67
7.4.1 fusion.ini..........................................................................................................68
7.4.2 field.ini.............................................................................................................69
7.4.3 LPR_B.ini........................................................................................................70
7.4.4 LoadPos.ini.....................................................................................................71
7.4.5 Customer.ini (or Symeo_2D.ini) ......................................................................71
7.5 Upload configuration files for FusionEngine ...........................................................73
7.5.1 Upload of files via WinSCP..............................................................................73
8SYMEO MAP..................................................................................................78
8.1 Configuration and Connection with Symeo MAP....................................................78
8.1.1 lpr.ini...............................................................................................................78
8.1.2 Starting FusionEngine.....................................................................................79
8.1.3 Starting Symeo Map........................................................................................80
8.1.4 Connection with mobile unit.............................................................................82
8.2 Display of Symeo MAP...........................................................................................83
8.2.1 Level of Transponders.....................................................................................83
8.2.2 Radius/ Hyperboloids of Transponders ...........................................................83
8.3 Antenna Calibration................................................................................................83
9NETWORK SETTINGS...................................................................................85
9.1 TCP/IP connection between PC and LPR-2DB station...........................................85
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9.2 Open Web Server ..................................................................................................86
9.3 Settings..................................................................................................................87
9.3.1 LAN.................................................................................................................88
9.3.2 Network...........................................................................................................89
9.3.3 Serial-to-Ethernet............................................................................................90
9.3.4 Remote Access...............................................................................................92
9.3.5 Miscellaneous .................................................................................................93
9.3.6 Special functions.............................................................................................93
9.3.7 Accept settings/ System reboot.......................................................................94
9.4 System status.........................................................................................................94
9.5 Diagnostics ............................................................................................................96
9.6 Update Firmware....................................................................................................97
9.6.1 Step 1 –File system........................................................................................98
9.6.2 Step 2 –Linux Kernel....................................................................................100
9.6.3 Step 3 –User space (optional)......................................................................103
9.6.4 Step 4 –Restart............................................................................................103
9.7 System Log..........................................................................................................104
10 SYMEO 2D PROTOCOL..............................................................................106
10.1 Introduction / Basics.............................................................................................106
10.1.1 Configuration file Symeo_2D.ini....................................................................106
10.2 Binary format of the protocol ................................................................................108
10.2.1 Data types.....................................................................................................108
10.2.2 Byte Stuffing..................................................................................................108
10.2.3 General Structure..........................................................................................109
10.2.4 Data fields.....................................................................................................110
10.3 ASCII format of the Protocol.................................................................................116
10.3.1 Data Types....................................................................................................116
10.3.2 General Structure..........................................................................................116
10.3.3 Data fields.....................................................................................................117
10.4 Bit Mask SELECTED-FIELDS..............................................................................124
10.5 CRC Calculation...................................................................................................125
10.6 Error Codes..........................................................................................................126
10.6.1 Overview.......................................................................................................126
10.6.2 Error codes ...................................................................................................126
10.6.3 LPR-B address..............................................................................................128
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LPR®-2DB
Product Documentation
General
Copyright © Symeo 2012
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11 APPENDIX A: AGENCY CERTIFICATIONS................................................129
United States (FCC) and Canada (Industry Canada)......................................................129
United States (FCC)........................................................................................................129
Canada (Industry Canada)..............................................................................................131
Symeo LPR®-System
LPR®-2DB
Product Documentation
General
Copyright © Symeo 2012
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The documentation for the LPR Local Positioning Radar System is published by:
SYMEO GmbH
Prof.-Messerschmitt-Str. 3
85579 Neubiberg
www.symeo.com
If you have any questions or suggestions, please contact:
Email: in[email protected]
phone: +49 89 660 7796 0
Copyright © Symeo GmbH 2009
All rights reserved
HISTORY
Version
Date
Description
3.17
2009-05-20
Initial release
3.18
2009-07-07
Added documents to one document
3.19
2010-02-01
Updated SYMEO Map and FusionEngine description
4.00
2010-06-30
Completely revised
4.01
2012-04-20
FCC Appendix added
VERWENDETE SYMBOLE
The following symbols are used in the documentation:
This symbol appears before instructions that must be followed at all times.
Failure to comply with these instructions will result in personal injury.
This symbol appears before instructions that must be followed at all times.
Failure to comply with these instructions will result in damage to equipment.
This symbol appears before information of particular importance.
All rights reserved, particularly those relating to the translation, reprinting, and reproduction
by photocopying or similar processes of all or part of the documentation.
All rights reserved, particularly for purposes of the award of patents or submission of utility
models.
Delivery options and technical changes reserved.
Published by SYMEO GmbH
Symeo LPR®-System
LPR®-2DB
Product Documentation
General
Copyright © Symeo 2012
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Symeo LPR®-System
LPR®-2DB
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General
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1 General
1.1 Safety Instructions
LPR®-2D systems are purely tracking and assistance systems. They
therefore do not satisfy special requirements for personal safety, e.g.
performance level c.
Follow the safety instructions in the operating instructions for the device
and the additional documentation!
Keep these safety instructions and other documents together with the device.
1.2 Installation
All installation, repair and servicing work must be carried out by qualified
and trained technicians!
1.3 Repairs
Repairs to the device must be carried out by authorized technicians.
Unauthorized opening and incorrect repairs could result in severe
danger to the user (danger of electric shock, radiated energy, fire
hazard).
1.4 Transport and Storage
Use the original packaging or other suitable packaging for returns and
whenever the system is to be transported. This ensures protection from
crushing, impacts, moisture and electrostatic discharge.
During setup and before operation, refer to the instructions for
environmental conditions included in the operating instructions for the
device.
Route the wires in such a way that they do not cause a hazard and are
not damaged. When connecting the wires, refer to the corresponding
instructions in the operating instructions for the device.
Do not drop the device and do not expose it to strong vibrations.
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LPR®-2DB
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1.5 Power Supply
A safety-inspected power cable that satisfies the regulations of the
country of use is required for the device. Devices with metal housings
must only be connected to a grounded, shock proof socket.
The device must not be operated unless the nominal voltage of the
device matches the local supply voltage. Check the supply voltage of
the device in stationary devices.
When connecting and disconnecting wires, refer to the instructions in
the operating instructions for the device.
Do not use any damaged wires (damaged insulation, exposed wires). A
faulty wire poses a risk of electric shock or fire hazard.
1.6 Setup and Operation
During installation, make sure that no objects or fluids get inside the
device (risk of electric shock, short circuit).
In emergencies (e. g. if there is damage to the housing, control
elements or the mains cable, if fluids or foreign bodies have infiltrated
the equipment), switch off the power supply to the device immediately
and notify your SYMEO Service.
Protect the contacts of all of the device's sockets and plugs from static
electricity. Do not touch the contacts. If it is ever necessary to touch the
contacts, take the following precautionary measures: Touch a grounded
object or carry a ground strap before touching the contacts. This will
divert static charges.
Proper operation (in accordance with IEC60950/EN60950) of the device
is only assured if the housing and integral covers for mounting slots are
fully installed (electric shock, cooling, fire protection, noise suppression).
If necessary, refer to the corresponding instructions in the operating
instructions for the device.
In the case of high outside temperatures and intense, direct solar
radiation or other radiant heat, it may be necessary to provide a sun or
heat shield.
1.7 System Extensions and Accessories
Data links to peripheral devices must be provided with adequate
shielding.
For LAN cabling, the requirements in accordance with EN 50173 and
EN 50174-1/2 apply. Use of either a Category 5 shielded cable for
10/100 Ethernet or Category 5e shielded cable for gigabit Ethernet is a
minimum requirement. The specifications of standard ISO/IEC 11801
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Copyright © Symeo 2012
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must be complied with.
The warranty shall be voided if you cause defects to the device by
installing or exchanging system extensions.
1.8 Additional Instructions Regarding Compact Type and Integral
Type Stations
The Compact type LPR station must not be opened except for
installation. The Compact station contains no serviceable components.
When opening, ensure that no fluid gets into the housing. When sealing
the station, ensure that the seal is included in the cover and that the
Compact station is completely closed. Otherwise, moisture can
penetrate the station and damage it.
In order to install the Integral type LPR station, the hood must be
detached from the serviceable components. Refer also to the
instructions on installing the transponder.
Please take note of the safety and operating instructions in the
operating instructions for the system in which you want to install the
component.
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LPR®-2DB
Product Documentation
Introduction
Copyright © Symeo 2012
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2 Introduction
2.1 Details
This symbol appears before information of particular importance.
This symbol appears before instructions that must be followed at all
times. Failure to comply with these instructions will result in damage to
equipment.
This symbol appears before instructions that must be followed at all
times. Failure to comply with these instructions will result in personal
injury.
This symbol appears if the following sub-chapter describes difference in
the operating mode. An overview about the operating modes is given in
chapter 3.2.
2.2 Overview of Files
LPR-2DB Station
(Mobile unit / base
station):
-master_basestation_config.txt or Basestation_config.txt
(depending on the selected operating mode)
LPR-2DB Integral
Stations
(transponders):
-STATION010_CONFIG.TXT
-STATION011_CONFIG.TXT
-STATION012_CONFIG.TXT
-STATION013_CONFIG.TXT
-STATION014_CONFIG.TXT
-STATION015_CONFIG.TXT
Master LPR-2DB
Integral Station
(optional):
-station01M_config.txt (depending on the selected operating
mode)
Symeo MAP (optional)
-SYMEO Map XP Installer
FusionEngine:
-FusionEngine.exe
-const_pos.ini
-field.ini
-fusion.ini
-LPR_B.ini
-movingcell.ini
-multi_cell.ini (TDOA)
-HoverTrack.ini / VehicleTrack.ini or TDOA.ini (depending on
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LPR®-2DB
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Introduction
Copyright © Symeo 2012
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the selected model, application and operation mode)
-symeo_map.ini
-symeo_2D.ini
All files are delivered in the structure shown in Figure 1 (“deliverables” and “symeoMap”).
Figure 1- folder structure
The folder “mobileUnits”
contains all files for the
vehicles. The folder
“staticCells” contains all files
for the LPR-2DB Integral
Station including the master
LPR-2DB Integral Station. The
folder name for all LPR stations
is named with the serial
number.
To allocate the stations for the customer, it makes sense to create a
text-file that describes the function of that LPR station, i.e.
“forklift_123_customer.txt”.
If it is later necessary to replace a LPR unit (e.g. due to a defect) you
can find easily the necessary configuration files for the appropriate
station.
Folder for the files of the
FusionEngine
Symeo LPR®-System
LPR®-2DB
Product Documentation
Introduction
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Folder for the files of the
firmware for the mobile unit
Folder for the configuration
files of the DSP for the mobile
unit
Folder for the configuration
files of the DSP for the
transponder unit
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LPR®-2DB
Product Documentation
Introduction
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2.3 Project Planning
The planning from identifying the position for the transponders to the commissioning with
Symeo MAP is separate into intermediate steps. In the following all possible steps are listed
with refer to the relevant chapter in this document.
ToDo
Description
Responsible
Relevant
chapter
1
Definition of measurement
area/cell
Analyzing of layout,
pictures, definition of
mounting positions
Customer
provides
information to
Symeo
---
2
Definition of local
coordinate system, point
of origin
Local Coordinates
available? Coordinates of
light towers available?
Customer
---
3
Definition of operating
mode
3 operating modes are
available. Operating mode
depends on the number of
vehicles and the number of
cells
Symeo
Chapter 3.2
4
Definition of vehicle model
HoverTrack-model or
VehicleTrack-model
Symeo
Chapter 3.3
5
Definition of antenna
positions and position of
mobile unit on the vehicle
for mounting
Defining mounting position
of 1, 2, 3 or 4 antennas on
the vehicle
Customer/
Symeo
Chapter 5.3
6
Definition of the height of
the antenna above ground
level
The height of the top of the
antennas above ground
has to be calculated to set
the appropriate height for
the mounting of the
transponders, height of
transponders ideally
0.5meters over antennas
level, up to 2.5meters is
possible
Customer
Chapter 6.3
7
Definition of protocol for
interface
Structure of the protocol
can be configured.
Customer/
Symeo (if
information is
provided)
Chapter 0
8
Mounting of the LPR-2DB
Integral Station on the LTs
Mounting of the LPR-2DB
Integral Station (labeled
XX0, XX1, XX2, XX3, XX4,
XX5 and Master XXM)
according to the files Visio-
LPR_CellPlanning.pdf and
Customer
Chapter 5.2
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LPR®-2DB
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Introduction
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CellPlanning.xlsx
9
Mounting of the antennas
Mounting on defined
positions on vehicle with
installation brackets
Customer
Chapter 5.3
10
Mounting of the mobile
station on the vehicle
Mounting of the mobile
station, connection to the 1,
2, 3 or 4 antennas, power
10-36VDC and TCP/IP
Customer
Chapter 5.1
11
Surveying of LPR-2DB
Integral Station
Surveying of the mounted
LPR-2DB Integral Stations
needs to be done to local
coordinates with best
possible accuracy (+- 2cm)
Customer
Chapter 6.1
12
Surveying of vehicle
Surveying of the antenna
positions on to the vehicle.
Depending on the steering
of the vehicle (front and/or
back) the definition of point
of origin on vehicle has to
be set. Offset from point of
origin to container center
has to be determined.
Customer
Chapter
6.2/ chapter
6.3
13
Implementation of
Surveying coordinates in
configuration files
The surveying coordinates
have to be provided in a
data format provided from
Symeo. Transponder
coordinates have to be
implemented into
configuration files for the
master transponder or the
mobile unit. Vehicle
coordinates have to be
implemented into the
configuration files of the
mobile station on the
vehicle.
Customer
Chapter
6.1.4 and
6.3.1
Chapter
7.2.2 or
7.4.2
14
Upload of configuration
files
Configuration files to be
uploaded to the Master-
Transponder (operating
mode 2b and 3b) or mobile
unit (operating mode 1, 2a,
2b) and mobile station on
vehicle
Customer/
Symeo
Chapter 7.3
15
Modifying of ini-files for
software FusionEngine
Modification of ini-files
Customer
Chapter 7.4
16
Upload of files for software
fusion engine
Upload of ini-files via
WinSCP
Customer
Chapter 7.5
Symeo LPR®-System
LPR®-2DB
Product Documentation
System Description
Copyright © Symeo 2012
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3 System Description
SYMEO Industrial Local Positioning Radar (LPR) is a system for contactless, real-time
determination of distances and positions.
LPR B 2D is a distance measurement system which is particularly well suited for use in very
harsh, industrial environments, in which other systems such as mechanical rotary encoders
or lasers cannot function for long periods.
The system composes of mobile units and fixed, wall-mounted units at known positions. The
mobile units compute its position using the delay time of the radio-signals between wall
mounted units and the mobile unit.
LPR-2DB has an in-build communication channel to handle all background communication
necessary for operation of the positioning system. LPR-2DB units use the same frequency
band and the same hardware for communicating as for measuring distance. This means that
no external WLAN or cable networks are needed for transmitting measurement values and
other reference data.
The system is organized in a cellular fashion. 4 to 6 wall-mounted units are arranged to form
a group with a unique group-ID and an individual measurement ID ranging from 0-5 for each
wall-mounted unit. For the communication between the mobile unit and the 6 transponders 6
different measurement channels separated in frequency (FDMA) are used, allowing instant
position computation.
For arrangements with more than 6 transponders neighboring cells with different group IDs
can be set up. To separate the communication of neighboring cells different communication
frequency channels can be assigned for different cells. For some system topologies an
additional cell-master is required to handle measurement timing and communication.
3.1 Technical Data
Frequency range
5.725-5.875 GHz
5.725-5.875 GHz
Transmitting power*1
Max. 0.010 W / 10 dBm output on the antenna port
Output power is adjustable
For overall output power antenna gain and cable attenuation
must be added
Range*2
Max. 300 m
Measurement accuracy*2
up to ± 10 cm
Measurement frequency
Max. 20 Hz
Power supply
10-36 V DC
Ambient temperature *2
-40°C bis +70°C
*1 Transmitting power can be adjusted to assure that emission limits at the antenna are within
legal limits, e.g. 25 mW EIRP in the EU and 10 mW EIRP in the US
*2 Depending on the antenna type, mounting position and environment
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LPR®-2DB
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*3 Temperature inside the housing can range from -40°C to 85°C.
3.2 Operating Mode
There are different system topologies to determine a 2D position with a Symeo LPR®system.
Which operating is best suited depends on the application and the environment. It depends
on the number of mobile units you want to track and on the number of cells which are
necessary to cover the environment.
Operating Mode
Properties
Mode 1: Basic Cell
6 fixed wall-mounted units [LPR-2DB Integral Station], 1 mobile
unit [LPR-2DB Station]; measurement principle: RTOF (round
trip of flight)
Mode 2a: Managed Cell
6 fixed wall-mounted units [LPR-2DB Integral Station], 1Master,
up to 5 mobile units [LPR-2DB Station] ; measurement principle:
RTOF (round trip of flight); cell coordinates are stored on the
mobile unit(s)
Mode 2b: Managed Cell
6 fixed wall-mounted units [LPR-2DB Integral Station], 1 Master,
up to 10 mobile units [LPR-2DB Station] ; measurement
principle: RTOF (round trip of flight); cell coordinates are stored
at the master
Mode 3a: TDOA
6 fixed wall mounted units [LPR-2DB Integral Station], 1 Master,
no limitation of mobile units [LPR-2DB Station] ; measurement
principle: TDOA (time difference of arrival); cell coordinates are
stored on the mobile unit(s)
Mode 3b. TDOA
6 fixed wall mounted units [LPR-2DB Integral Station], 1 Master,
no limitation of mobile units [LPR-2DB Station] ; measurement
principle: TDOA (time difference of arrival); cell coordinates are
stored at the master
The operating mode is normally set by Symeo after consulting the
customer.
3.2.1 Operation Mode 1: Basic Cell
4-6 fixed mounted units (i.e. at a wall or on light poles) at known positions as basic cell and
one single mobile unit form the setup for mode 1. The fixed mounted units are configured as
reply units or “slave transponders”. Each fixed mounted unit has the same group ID and a
different measurement ID ranging from 0...5. Additionally, the units within the same group
must be set to the same communication channel. The positions of the fixed mounted units
are known to the mobile unit. The measurement of mode 1 is based on the measurement
principle RTOF (Round Trip Of Flight). It is organized as follows:
The mobile unit acts as “master base-station” and sends a measurement command to the
fixed mounted units. The fixed mounted units synchronize to this signal and transmit a return
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LPR®-2DB
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System Description
Copyright © Symeo 2012
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signal with precisely known delay and an individual frequency offset corresponding to the
fixed mounted unit measurement ID. The mobile unit computes the round-trip time-of-flight
and therefore the 1D distance to each transponder. Finally, the mobile unit calculates of all
single 1D distances a 2D position.
222
2
2
2
1
344
4
4 4 4
3 3
3
3
3
Figure 2 - System setup for mode 1
1: Mobile unit
2: Wall-mounted unit
3: Communication channel (commands)
4: Broadband measurement signals
3.2.2 Operation Mode 2: Managed Cell
Mode 2 is used when several mobile units are present at the same time within the cell. In this
case the measurement intervals between the mobile units are synchronized. This is done by
using the setup of mode 1 and an additional master transponder for coordination. The master
transponder assigns the measurement slots for different mobile units. The mobile unit no
longer initializes the measurement and simply acts as base-station. The measurement of
mode 2 is based on the measurement principle RTOF (Round Trip Of Flight). The detailed
measurement procedure is as follows:
The master transponder repeatedly broadcasts his group-ID. Base-stations in range reply to
this broadcast with their ID. The master transponder keeps a list of active base-stations in
range, assigns measurement slots to the stations and broadcasts them to the individual
stations in range. The base-station then transmits the broadband measurement signal and
computes its position as described in mode 1.
Measurement rate for the stations present can be set to equal distribution for all mobile units
or to a preferred channel with maximum measurement rate for one base-station and slower
measurement rate for the remaining stations.
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