Pathloss version 5 - Maintenance update - Build date January 4, 2011

Check the build date of your current installation. Click the Help - About Pathloss 5.0 menu item.

If the build date is May 7, 2009 or newer, then use the link below to download the January 4, 2011 maintenance update.

Pathloss 5 update
This is an InstallShield installation program. The Pathloss program must be closed to run this update

If the build date of the current installation is earlier than May 7, 2009 then the update must be carried out as a new installation as described below.

Pathloss version 5 - Maintenance update using a new installation

Your existing installation must be first be uninitialized and then the program must be removed.

The following steps detail the procedure.

Start the Pathloss program

Click Configure - Pathloss program - Uninitialize program

If you were able to initialize the program on line, then select this option and click the Uninitialize Program button. You will be prompted to proceed with the uninitialization. This step will automatically update the licensing database for the next installation.

If you were not able to initialize the program on line due to the program internet access restrictions, then select the EMail option and click the Uninitialize Program button.

You will first be prompted to proceed with the uninitialization. Once the program has been uninitialized, the dialog on the left will appear. Click the "Copy serial number and uninitialization code" button. This step copies these two item to the clip board.

Create a new Email to cte@pathloss.com and paste (Ctrl V) the serial number and uninstallation code into the EMail body.

When we receive the EMail, the licensing database will be updated for the next installation.

Note that the uninitialization procedure (on line and EMail) creates the file "pluninst.txt" in the tmp_file folder. This file contains the serial number and uninstallation code. This also can be Emailed to update the installation status

Once the program has been uninitialized, remove the Pathloss program using the Control Panel operation "Add or Remove Programs" to remove the Pathloss program.

Finally download and install the latest program build using the procedure supplied with your serial number notification

Important note to VISTA users
It will be necessary to manually delete all files in the directory

C:\Users\\AppData\Local\VirtualStore\Program Files\Pathloss 5\geo_data

before installing the complete program.

Sdh3000s Mtd

TMA Status..How To Cek SWR

Pushing N95 to Trnasmit more power

See the attached picture.


Basically, this is a communication path from 3G Power Amplifier (PA) to power controller. When the power controller detected a low voltage from PA, it will tell the PA to rise its power through another path.

Changing the resistor with higher resistance value will drop the voltage to the controller. Thus, the controller will assume that the current power is not enough
 
 

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If many "tuned" phones of this kind are on the same cell , UL interference would increase big deal, and you would all experience degradation of 3G services ...

I think not a good idea ... this contrl of power in 3G is even more important than it was in 2G
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But this is the idea how to change your power control :-)

UMTS Question and answer part 5

71. What can we try to improve when access failure is high?


Answer –

• When access failure is high we can try the following to improve RACH performance:

• Increase maximum UE transmit power allowed: Max_allowed_UL_TX_Power.

• Increase power quickly: power_Offset_P0.

• Increase number of preambles sent in a given preamble cycle: preamble_Retrans_Max.

• Increase the number of preamble cycles: max_Preamble_Cycle.

• Increase number of RRC Connection Request retries: N300.



72. What is Eb/No requirement for HSDPA?

Answer –

The Eb/No requirement for HSDPA varies with user bit rate (data rate), typically 2 for 768kbps and 5 for 2Mbps.



73. What HS Channels are introduced in HSDPA in L1?

Answer –

HS-PDSCH – High Speed Physical Downlink Shared Channel

HS-SCCH – High Speed Shared Control Channel



74. How Power Control is implemented in HSDPA?

Answer -Initial Power is set in the same way as open Loop Power control of DCH & there is no further power control on HSDPA Shared Channel HS-DSCH. The Channel Rate is controlled by adaptive modulation & coding formats.



The principles and functionality of the power control for the HSDPA associated dedicated channels are the same as for the DPCH power control.



HS-DPCCH power is an offset relative to DPCCH depending upon whether the UE is in soft handoff or not.



The Power for HS-SCCH is fixed.



75. What FIXED SF is used for HSDPA?

Answer –

SF 16, maximum of 5 codes.



76. What do you understand by CQI Measurements?

Answer – Channel Quality Estimation (CQI) for HSDPA sessions only.

In order to aid scheduling and TFRC selection in the RBS, the UE sends a channel quality indicator (CQI) report on the uplink.

The CQI report estimates the number of bits that can be transmitted to the UE using a certain assumed HS-PDSCH power with a block error rate of 10%



77. What type of Channel Coding is used for Voice and Data services?

Answer –

Voice – Convolution Coding

Data – Turbo coding

UMTS Question and answer part 4

61. What could be the cause of soft handover failure?


Answer –

• Undefined neighbors

• One way Neighbor definition

• UE issue.

• Resource unavailable at target NodeB.

• Inadequate SHO threshold defined.

62. What are the three sets in handover?

Answer –

Active Set

Monitored Set

Detected Set

63. What are the major differences between GSM and UMTS handover decision?

Answer –

GSM:

• Time-based mobile measures of RxLev and RxQual – mobile sends measurement report every SACH period (480ms).

• BSC instructs mobile to handover based on these reports.

UMTS:

• Event-triggered reporting – UE sends a measurement report only on certain event “triggers”.

• UE plays more part in the handover decision.



64. What are the events 1a, 1b, 1c, etc.?

Answer –

e1a – a Primary CPICH enters the reporting range, i.e. add a cell to active set.

e1b – a primary CPICH leaves the reporting range, i.e. removed a cell from active set.

e1c – a non-active primary CPICH becomes better than an active primary CPICH, i.e. replace a cell.

e1d: change of best cell.

e1e: a Primary CPICH becomes better than an absolute threshold.

e1f: a Primary CPICH becomes worse than an absolute threshold.



65. What are event 2a-2d and 3a-3d?

Answer –

Events 2a-2d are for inter-frequency handover measurements and events 3a-3d are for IRAT handover measurements.

e3a: the UMTS cell quality has moved below a threshold and a GSM cell quality had moved above a threshold.

e3b: the GSM cell quality has moved below a threshold.

e3c: the GSM cell quality has moved above a threshold.

e3d: there was a change in the order of best GSM cell list.



66. What may happen when there’s a missing neighbor or an incorrect neighbor?

Answer –

• Access failure and handover failure: may attempt to access to a wrong scrambling code.

• Dropped call: UE not aware of a strong scrambling code, strong interference.

• Poor data throughput.

• Poor voice quality.

• Etc.



67. How is inter-frequency Handover triggered?

Answer –

The network decides that inter frequency measurements need to be performed and sends the MEASUREMENT CONTROL MESSAGE with Measurement type set to Inter-Frequency measurements. Generally it will set an Event as well along with the measurements. The following are list of Events that can trigger Measurement Report.

• Event 2a: Change of Best Frequency

• Event 2b: The estimated quality of the currently used frequency is below a certain threshold and the estimated quality of a non-used frequency is above a certain threshold

• Event 2c: The estimated quality of a non-used frequency is above a certain threshold

• Event 2d: The estimated quality of the currently used frequency is below a certain threshold

• Event 2e: The estimated quality of a non-used frequency is below a certain threshold

• Event 2f: The estimated quality of the currently used frequency is above a certain threshold

The Inter-Frequency Handover Evaluation bases its decision on P-CPICH quality measures on the currently used frequency and on one or more non-used frequencies. If the evaluation result is positive, one cell on a non-used frequency is proposed to Inter-Frequency handover Execution.

Inter-Frequency Handover is a hard handover where the UE is ordered by the network to tune to another frequency. This means that there will be small interruptions in the data flow to and from the UE.

68. What kind of Handover takes place in Load Sharing?

Answer –

It’s a blind handover to the co-located cell. IFHO i.e.



69. What do you understand by IFHO?

Answer –

IFHO – Inter Frequency Handover

70. What do you understand by Directed Retry?

Answer –

When there is a co-existing GSM RAN, excess traffic in a WCDMA cell may be off-loaded to GSM

If a call is chosen for Directed Retry to GSM, the request for the speech RAB will be rejected with cause "Directed retry" and then a request is made to the core network to relocate the UE to a specific GSM cell, using the Inter-RAT handover procedure. This handover is a blind one since the target cell is chosen not based on UE measurements. Therefore, the target cell must be co-located with the WCDMA cell. Co-located GSM cells are assumed to have similar coverage and accessibility as their respective WCDMA cells.