Month: March 2019

LTE Base Station Classifications

March 31, 2019

As per 3GPP reference 36.104 release 12, there are four classes for the base stations based on the rated power is listed below S.No. 3GPP Base station Class Rated O/p Tx Power Base Station Type 1 Wide Area Base Station  No Upper limited defined by 3GPP, Max power is restricted by local Regulatory Macro Cell […]

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5G and 4G Comparison

March 31, 2019

A Short comparison of 5G and 4G technologies is given is table below Technology Data Rates Latency Mobility Support Spectrum Efficiency Users Density Energy Efficiency 5G (NR) Avg 100 Mb/s Peak 20 Gb/s  ~ 1 ms > 500 Km/h x3 Better DL- 30 bits/Hz UL- 15bits/Hz  1000K/square Km x100 Better 4G (LTE) Avg 25 Mb/s […]

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LTE Network in Box -LTE NIB

March 31, 2019

A LTE NIB is a compact box that includes an eNodeB base station and integrated EPC or Mini-EPC. NIB offers standard authorized IP connectivity for LTE users. NIB can integrate additional components such as IMS to provide  services like Voice over LTE  and push-to-talk . The local Mini EPC  can also serve limited neighboring eNodeBs (Four-Five), if […]

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What is LTE-LAA and its co-existence with other technologies

March 31, 2019

Licensed-assisted access (LAA) is a 3GPP enhancement of Long-Term Evolution (LTE) to allow cellular network operators to offload some of their data traffic by accessing the unlicensed 5 GHz frequency band, which has been standardized in LTE Release 13 only for the downlink (DL). LTE LAA allows operators to transmit in the unlicensed spectrum using […]

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What is LTE Repeater, how it works? perfect guide for buying one !

March 31, 2019

A LTE repeater (also known as cell phone signal booster or amplifier) is a type of bi-directional amplifier used to improve UE reception and address coverage issues. LTE repeater does not just do power amplification of the received signal from LTE eNB or LTE Base Station, it also selects the band specific signals using one duplexer. After amplification it transmits the signal back to […]

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What is Inter Symbol Interference (ISI) in LTE, How Cyclic Prefix (CP) helps eliminating this problem ?

March 31, 2019

What is Inter Symbol Interference (ISI) ? In an ideal system (theoretical), the transmitted symbols arrive at the receiver without any loss or interference, as shown in the following figure. But in a real scenario, due to the signal propagation phenomena, such as reflection, diffraction or multipath, a receiver can receive several delayed versions of […]

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802.11ax vs LTE : Key features and Not just 4X Throughput

March 31, 2019

It was last year when I first read/ discovered about 802.11ax on one of the websites mentioned below as references. Ever since I tried to collect more information and wanted to write about the same. But every passing day/ week/ month, I learnt a new aspect about 802.11ax. Being from Telecom Industry and Radio background, […]

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RSRP (Reference Signal Received Power)

March 31, 2019

Reference Signal Received Power RSRP is the linear average of reference signal power (in Watts) measured over a specified bandwidth (in number of REs). This is the most important measurement UE has to do for cell selection, re-selection and handover. It is very similar to CPICH RSCP in WCDMA. It is applicable while UE in different RRC states […]

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RSSI (Received Signal Strength Indicator)

March 31, 2019

RSSI represents the total received wide-band power measured over entire bandwidth by UE. RSSI is not reported to eNodeB. It is computed to be used for the calculation of RSRQ in LTE system. RSSI is also a power and its measurement unit is dBm same as RSRP. RSSI=Serving Cell Power + Neighbour Co-Channel Cells Power + […]

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RSRQ (Reference Signal Received Quality)

March 31, 2019

RSRQ is th Reference Signal Received Quality and it can be defined using following. RSRQ= (N* RSRP)/RSSI As per the definition of RSSI, It is wide band power including signal power from serving cell, co-channel neighbour cell, interference from other cell interference and noise, in similar word one can say that RSRQ define the purity […]

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