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What are the possible causes for a Drop Call on a UMTS network?               Poor Coverage (DL / UL)  Pilot Pollution / Pilot Spillover  Missing Neighbor  SC Collisions  Delayed Handovers  No resource availability (Congestion) for Hand in  Loss of Synchronization  Fast Fading  Delayed IRAT Triggers  Hardware Issues  External Interference

What are the possible causes for an Access Failure in UMTS?       ·          Missing Neighbors ·          Poor Coverage ·          Pilot Pollution / Spillover ·          Poor Cell Reselection ·          Core Network Issues ·          Non – availability of resources. Admission Control denies ·          Hardware Issues Improper RACH Parameters External Interference

What are the processing gains for CS and PS services? CS12.2:     25dB PS-64:       18dB PS-128:     15dB PS-384:     10dB HSDPA:      2dB

Basic Parameters of WCDMA Frequency Band                                      :            2100 MHz 1920-1980MHz (UL) &2110-2170 MHz (DL) Duplex Space                                         :            190 MHz Channel bandwidth                                 :            5 MHz Coding Spacing   ...

About Us  Telecomstudy18 Hello Guys, Thanks for landing on “About Page” at Telecomstudy18 Telecomstudy18 was launched on 14-Febuarary- 2013 with a dream to provide every possible guides and tutorials related to Fresher and Experience Telecom. The main goal of starting this blog is to build an active community of Telecom Engineer so that they can learn every aspect of technology GSM, WCDMA and LTE in a better way. Telecomstudy18 constantly tries to bring quality tutorials for Telecom domain Engineer  to help them make their knowledge  more better gradually. Our unique and detailed posts will surely help you to be an independent successful. Tutorials to make a successful improve telecom domain skill  :) This blog mainly focus on below categories: GSM WCDMA CDMA LTE 

What is SIR? SIR is the Signal-to-Interference Ratio – the ratio of the energy in dedicated physical control channel bits to the power density of interference and noise after dispreading. What is RSCP? RSCP stands for Received Signal Code Power – the energy per chip in CPICH averaged over 512 chips. What is Eb/No? By definition Eb/No is energy bit over noise density, i.e. is the ratio of the energy per information bit to the power spectral density (of interference and noise) after dispreading. Eb/No = Processing Gain + SIR For example, if Eb/No is 5dB and processing gain is 25dB then the SIR should be -20dB or better. What are the Eb/No targets in your design? The Eb/No targets are dependent on the service:  on the uplink, typically CS is 5 to 6dB and PS is 3 to 4dB – PS is about 2dB lower.  on the downlink, typically CS has 6 to 7dB and PS is 5 to 6dB – PS is about 1dB lower. Why is Eb/No requirement lower for PS than for CS? PS has a bet...

Handover Parameter maxActiveSet: Maximum number of cells allowed in the Active Set. IndividualOffset: Offset value which can be assigned to each cell. It is added to the measurement quantity before the UE evaluates whether or not an event has occurred. It can either be positive or negative value. measQuantity1: Defines the measurement quantity for intra-frequency reporting evaluation. Default is Ec/No . hsQualityEstimate: Indicates whether Ec/No or RSCP should be used for indicating "best cell" for HS-DSCH Cell Change. Default is RSCP. reportingRange1a: Relative threshold referred to the CPICH of the best cell in the Active Set used as evaluation criteria for event 1a (a primary CPICH enters the reporting range). reportingRange1b: Relative threshold referred to CPICH of the best cell in the Active Set used as evaluation criteria for event 1b (a primary CPICH leaves the reporting range). reportingInterval1a: Time between periodic reports at even...