What is Echo Canceller and why it require in GSM – as from name Echo canceller is nothing but the process to remove duplicate signal or delayed signal, let’s see how it in GSM. An EC is used on the PSTN side of the MSC for all voice circuits. Echo control is required at the … Read more
When we talk about Mobile Business then its worst useful without authentication means to make Network as business all user required to be authenticate lets understand how authentication done in gsm. Authentication Center (AUC) The AUC is a processor system, it performs the “authentication” function. It will normally be co-located with the Home Location Register … Read more
As From the Name VLR means Visitor Location Register and HLR means Home Location Register so HLR having all detail of subscriber and VLR having temporary details for mainly call processing related. Let’s check in detail HLR and VLR in Function in telecom. HLR and VLR definition and function for GSM and LTE in telecom … Read more
Why and How BSIC Planning in GSM Why BSIC Planning in GSM ? Because when tight frequency planning required or we have very limited frequency to plan then to reduce Mobile confusion about cell id BSIC used to identify cell id after BCCH. lets understand How BSIC Planning in GSM? In addition to the assignment of frequency … Read more
How Normal and Extended Cyclic Prefix in LTE The key to making OFDM realizable in practice is the use of the FFT algorithm, which has low complexity. In order for the IFFT/FFT to create an ISI-free channel, the channel must appear to provide a circular convolution. Adding cyclic prefix to the transmitted signal to create … Read more
The global telecommunications industry was not immune to economic forces in 2012 that slowed growth from earlier predictions, according to a new market analysis report from Insight Research. Spending for wireline services contracted in 2012, while spending on wireless services grew modestly. According to the new industry market study, telecommunications services revenue worldwide will grow … Read more
LTE Frame Structure and Resource Block Architecture The figure below shows the LTE frame structure under Time division mode (TDD) Type 2 and Frequency Division mode (FDD) Type 1. Differences in LTE Frame Structure Main differences in LTE Frame Structure between the two modes are Frame 0 and frame 5 (always downlink in TDD) Frame … Read more
USA based AT&T has announced that it is paying US$1.9 billion in cash to buy blocks of radio spectrum from Verizon Wireless. AT&T has agreed to acquire spectrum in the 700 MHz B band from Verizon Wireless for $1.9 billion in cash and AWS spectrum licenses in several markets, including Phoenix, Ariz., Los Angeles and … Read more
Here I write about GSM RF Optimization Step by Step and how to find KPI degradation and its solution. The RF network optimization process can be categorized by the following steps: Problem analysis Analyzing performance retrieved from tool reports and statistics for the worst performing BSCs and/or Sites Viewing ARQ reports for BSC/Site performance trends … Read more
OFDM and SC-FDMA Fundamental OFDM was selected for the downlink because it can Improved spectral efficiency Reduce ISI effect by multipath Provide better Protection against frequency selective fading OFDM is a scheme that offers good resistance to multipath and is now widely recognized as the method of choice for mitigating multipath for broadband wireless. It … Read more