Questions tagged [lte]

LTE - Long Term Evolution - is a wireless cellular system

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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
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SIM7080G MFF2 SIM not detected

I have designed and assembled a custom PCB with ESP32 and SIM7080G LTE-M modem, basically an IoT weather station. SIM7080G datasheet Everything works fine except for a very important part that renders ...
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Sim7600 TLS data buffer size?

I use sim7600 module's TLS layer to connect the Azure IoT hub. I have problem with tls buffer size, which is 2kb(as datasheet says). It acts unexpectedly when i try to receive message more than 2kb in ...
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How To calculate RSSI parameters in 3G and LTE

I'm working on how to determine the distance using RSSI through LTE and 3G network, but I'm having a problem how to calculate the RSSI at a certain distance
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NB-IoT: open/close PDP/bearer for each transmission or keep constantly open?

What is the "right strategy" to communicate from sensor to network? Assuming sensor sends data every 5 minutes or maybe every 60 minutes should I activate PDP context and open bearer for ...
tipo1000's user avatar
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What type of antenna connector is this? (USB 4G modem)

What type of antenna connector is in the Huawei E5573Cs-322 phone? (Internally - left side on the image) SMA or ts-9? Photo attached.
Ruslan Korolev's user avatar
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Can the PA1616D GPS module connect to a backend server to send GPS updates to a mobile phone?

I am building an IOT device that will be moving around outdoors and will not be able to have a secure wifi connection. I want to be able to know the location of this device at all times on my mobile ...
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How to build a safe antenna switch and how to simulate loss of reception?

Problem : I'd like to run the following test routine with an LTE router: cause a loss of signal, as if the router entered a tunnel remove the signal obstruction, as if the router just exited said ...
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CSFB service vs SRVCC service - LTE basics

I have been reading core architecture topics on LTE. In a session, I was introduced to CSFB, as a service handover, instead of the coverage handover associated with the SRVCC. While I am able to ...
Kaswechiha's user avatar
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How to use Snapdragon X16 LTE Modem chip

I've seen many LTE modems use MDM9X50 chips. After searching for this chip on the internet, I just saw this webpage, and there is no more information about the "Snapdragon X16 LTE Modem", ...
John Jin's user avatar
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LTE PC5 Subframe Structure

LTE provides sidelink communication via the PC5 interface. According to the "secondary literature" [1],[2],[3], the PC5 subframe is structured as follows: Symbol 0,1,3,4,6,7,9,10,12: PSCCH, ...
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Best antenna design with the following requirements?

I'm looking for the best antenna design with the following requirements Small Discrete Wideband (LTE and WiFi) Directional High gain (20-25dBi with relatively high transmission power) Could anyone ...
icyli2's user avatar
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Estimating the range of an antenna and determining what the best option is?

I'm very new to radio communication so I apologize for the lack of knowledge about this subject. That being said, I'm looking for a directional antenna imagine a situation as follows, I'm in a rural ...
icyli2's user avatar
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LTE Bandwidth at band edge

If my LTE uplink channel is right on the band 20 edge for example 861.9MHz or 24449 EARFCN and my LTE BW is 10MHz does that mean the final signal would be outside of B20 or 856.9-866.9 ? Or is the ...
Engo's user avatar
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Why in MISO, SISO, MIMO definition Input is Transmitting antennas not the receiving ones?

This is a definition for SIMO in the reference below: "The SIMO or Single Input Multiple Output version of MIMO occurs where the transmitter has a single antenna and the receiver has multiple ...
Son Pham's user avatar
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Coexistence Testing for Consumer grade RF and ECG Systems

How are ECG (electrocardiogram) systems tested on wearable products to show no coexistence issue RF systems? Specifically I am trying to understand if the products are tested with ECG electrodes ...
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Powering On/Off Quectel BG95 LTE & GNSS module

I have a Quectel module of the BG_95 series, for LTE and GNSS. Haven't gotten to use it but am trying to integrate it with a PCB. In the hardware design guide they list a circuit for powering off ...
Feynman137's user avatar
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How to bond PCB and metal for high power RF boards

I want to bond a PCB (2 layer & 0.6mm thickness) to a metal (copper & 4mm thickness.) Could anyone help me with the process of bonding it? There is a power amplifier that has to be soldered ...
Vineeth's user avatar
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Getting 4G/LTE signal through sheet metal - opening/aperture size needed?

We have a storage area, that is surrounded by corrugated sheet metal. (Appears to be galvanised steel, and probably 2-3mm thick). Inside the sheet metal, we have a LTE/4G router, on the Telstra ...
user37872's user avatar
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Not getting expected band pass filter response

I am trying to make a LTE signal repeater and trying to filter all other signals except the band 3 (869 - 894 MHz) This is what I am getting: This is the circuit: ...
Prabodh's user avatar
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Impedance matching through via and signal trace of 2 layer board

Due to tight space constraints I need to pass my LTE signal (800-1800 MHz) through a via. The proximity between the antenna connector and the modem is very short (literally on the other side of the ...
Troy Cados's user avatar
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How are LAN routers, WAN routers and eNodeBs connected to each other (TCP/IP)? [closed]

I'm new to telecommunication, and from what I understand, an user equipement is either connected to a LAN router or an eNodeB, and a LAN router is connected to a WAN router, and routers send the ...
qwerty_99's user avatar
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Is MIMO equivalent to link aggregation?

Is MIMO the wireless version of link aggregation in wired networks? I'm not asking if MIMO is a similar link aggregation protocol like LACP or PAgP. What I'm asking is, if it is the same concept as ...
Noob_Guy's user avatar
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Does data rate depends on Frequency not on BW?

If we have two RF signals of 900Mhz and 1800Mhz both of equal Bandwidth 20Mhz which one has higher data rate?
Shashank 's user avatar
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What is meant by downstream bandwidth in lte?

In my phone, it says that the downstream bandwidth of LTE is 10Mhz. But if a carrier frequency of 900Mhz has a bandwidth of 20Mhz, i.e., frequency ranges from 900Mhz to 920Mhz, then I have almost half ...
Shashank 's user avatar
2 votes
1 answer
286 views

Calculate power of an LTE Signal

I am looking for the formula to convert the power level of an OFDM RF signal to an absolute power level. For example if I have my typical rectangular RF spectrum and the bandwidth of the signal is ...
Eoin O Connell's user avatar
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1 answer
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How do LTE radio networks deal with co-channel interference?

In 802.11 Wifi, I've read that a wifi adapter (like my laptop's wifi adapter/radio) will use Energy Detection to see if a channel is busy (if a certain energy threshold is detected on the channel, it ...
Jerry Ku's user avatar
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Which LTE band should I use?

Background I am designing a basic IIoT device. When the sensor detects the parameter of interest, it transmits a message using an LTE modem. The modem is capable of Cat-M1 and NB-IoT, and I want to ...
bob bob's user avatar
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PCB with 5 Pluggable RF modules and 1 LTE puggable module - will it cause issues for reception at different antennas?

I am designing a prototype PCB which shall have 5 pluggable RF modules and one 4G LTE module as shown in the image The Base board size shall be 240 x 140 mm, RF board size is 40 x 50 mm and LTE board ...
dndserv's user avatar
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Current waveform for LTE transmit

I am designing an IoT system which uses the SIM7000A. In the SIM7000 series datasheet it says that the highest possible current for LTE is under 200mA (section 5.4 of SIM7000 Hardware Design_V1.03). ...
Bill Mahoney's user avatar
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1 answer
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Is NB-IoT roaming possible?

I found a comment on a blog post stating that NB-IoT doesn't support roaming: nbiot do not support roaming (you must have sim from the operator that have the infrastructure). nbiot also lacks support ...
DurandA's user avatar
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How to connect CPU with RGMII pins to an LTE module that takes only SGMII signals?

The Hi3519 Hisilicon CPU has RGMII pins. We are trying to connect it to the EC21 LTE Module from Quectel which contains SGMII pins. Would using two Realtek RTL8201F-VB-GG PHY chips with magnetics ...
k051819's user avatar
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Why are there two LTE antennas?

I have a design with LTE CAT 4 and I wonder why two antennas are needed. I searched around the web but am still kind of confused. Below are my questions: Is the second antenna used for Rx only? Is ...
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