1 Slot Lte
- SLOT Systems Limited is the leading retail company for affordable and durable mobile phones, computers, accessories, and various types of Electronics. We consider it necessary to fill up this need in the global information technology sector with emphasis on Africa market.
- Network: GSM / HSPA / LTE Color. MEMORY Card slot microSD, up to 512 GB (dedicated slot) Internal 8/16 GB, 1 GB RAM MAIN CAMERA Single 5 MP, f/1.9, AF.
4G LTE includes:
What is LTELTE OFDMA / SCFDMAMIMOLTE DuplexLTE frame & subframeLTE data channelsLTE frequency bandsLTE EARFCNUE categories / classesLTE-M (Machine to Machine)LTE-LAA / LTE-UVoLTESRVCC
LTE Advanced topics:LTE Advanced introductionCarrier aggregationCoordinated multipointLTE relayDevice to device, D2D
Like previous cellular systems, and virtually all data communications systems, LTE data is carried in frames and subframes.
The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE Subframes then consist of two slots - in other words there are ten LTE subframes within a frame. Type 1 LTE Frame Structure.
Using frames and subframes enables the data to be synchronised enabling the radio network to be able to handle the data correctly.
The frames and subframes used different between the FDD and TDD versions of LTE because there are different requirements for segregating data on the two schemes.
The two types of LTE frame structure are:
- Type 1: used for the LTE FDD mode systems.
- Type 2: used for the LTE TDD systems.
Type 1 LTE Frame Structure
The basic type 1 LTE frame has an overall length of 10 ms. This is then divided into a total of 20 individual slots. LTE Subframes then consist of two slots - in other words there are ten LTE subframes within a frame.
Type 2 LTE Frame Structure
The frame structure for the type 2 frames used on LTE TDD is somewhat different. The 10 ms frame comprises two half frames, each 5 ms long. The LTE half-frames are further split into five subframes, each 1ms long.
The subframes may be divided into standard subframes of special subframes. The special subframes consist of three fields;
- DwPTS - Downlink Pilot Time Slot
- GP - Guard Period
- UpPTS - Uplink Pilot Time Stot.
These three fields are also used within TD-SCDMA and they have been carried over into LTE TDD (TD-LTE) and thereby help the upgrade path. The fields are individually configurable in terms of length, although the total length of all three together must be 1ms.
LTE TDD / TD-LTE subframe allocations
One of the advantages of using LTE TDD is that it is possible to dynamically change the up and downlink balance and characteristics to meet the load conditions. In order that this can be achieved in an ordered fashion, a number of standard configurations have been set within the LTE standards.
A total of seven up / downlink configurations have been set, and these use either 5 ms or 10 ms switch periodicities. In the case of the 5ms switch point periodicity, a special subframe exists in both half frames. In the case of the 10 ms periodicity, the special subframe exists in the first half frame only. It can be seen from the table below that the subframes 0 and 5 as well as DwPTS are always reserved for the downlink. It can also be seen that UpPTS and the subframe immediately following the special subframe are always reserved for the uplink transmission.
| Uplink / Downlink subframe configurations for LTE TDD (TD-LTE) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Uplink-downlink configuration | Downlink to uplink switch periodicity | Subframe number | |||||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||
| 0 | 5 ms | D | S | U | U | U | D | S | U | U | U |
| 1 | 5 ms | D | S | U | U | D | D | S | U | U | D |
| 2 | 5 ms | D | S | U | D | D | D | S | U | D | D |
| 3 | 10 ms | D | S | U | U | U | D | D | D | D | D |
| 4 | 10 ms | D | S | U | U | D | D | D | D | D | D |
| 5 | 10 ms | D | S | U | D | D | D | D | D | D | D |
| 6 | 5 ms | D | S | U | U | U | D | S | U | U | D |
Where:
D is a subframe for downlink transmission
S is a 'special' subframe used for a guard time
U is a subframe for uplink transmission
1 Slot Lte Phones
The frame and subframe structure used within LTE provides the data synchronisation and organisation required to enable it to be transferred in a logical and ordered fashion.
Wireless & Wired Connectivity Topics:
Mobile Communications basics2G GSM3G UMTS4G LTE5GWiFiIEEE 802.15.4DECT cordless phonesNFC- Near Field CommunicationNetworking fundamentalsWhat is the CloudEthernetSerial dataUSBSigFoxLoRaVoIPSDNNFVSD-WAN
Return to Wireless & Wired Connectivity
Has your LTE connection been letting you down lately? Or stopped working all together? Don’t worry! There are various fixes you can try before blowing up your cell carrier’s customer support line.
Turn airplane mode on and off
Sometimes the most obvious fix is the most reliable one. If your mobile data is giving you trouble, one of the first things you should try is turning airplane mode on and off. You can do this simply by dragging down the notification bar and tapping on the airplane icon, or you can do it through Settings.
Paths can differ slightly depending your Android version and phone manufacturer, but you can usually enable Airplane mode by going to Settings > Wireless & networks > Airplane mode. Turn it on for at least a couple of seconds, then disable it. In a lot of cases your LTE connection issues will be gone.
Restart your device
If toggling airplane mode didn’t solve your problem, it’s time for another tried and true step — restarting your device. Simply press and hold the power button of your smartphone and then tap Restart. Wait a couple of seconds and turn it back on. Check your status icon, but also test the speed of your LTE connection by opening some websites or downloading some smaller apps.
Make sure the right network mode is enabled
What is LTE Advanced?
Depending on your smartphone and carrier, you should have at least three connection types – 2G, 3G, and 4G LTE or just LTE. Usually, your device will try to connect to the fastest option when available, but if you’ve been tinkering with your settings or recently installed an update, that might need to be adjusted manually. Here is how to do it:
1 Slot Lte Phone
- Go to Settings, then tap on Mobile Network.
- Select Network mode. A pop-up list of preferred modes will appear.
- Tap on the auto or LTE option.
Take out and readjust your SIM card
If none of the steps above did the trick, the problem might lie in an ill-positioned SIM card. Eject it and carefully reposition it in its tray. Be careful when inserting it back into your device. Once you’re done, your LTE connection should be back to normal.
Check if you’re using the correct SIM slot
Certain dual-SIM phones only support LTE in one of the two available SIM slots. If you plugged the SIM in the wrong one without realizing, it may prevent LTE from working. Try moving the SIM card to the other slot.
Reset network settings
If you tried all of the above, but nothing changed, it’s time to take a slightly more drastic step. Resetting your network settings. Here is how you can do it:
- Head to Settings, then find either Reset or Backup & reset. Tap on it.
- From the list, tap Network settings reset. Keep in mind that this step will erase all network settings, including saved Wi-Fi networks, paired Bluetooth devices and so on. If you are sure you want to proceed tap Reset Settings.
- You will be asked to enter your PIN if you have one. Do so and confirm resetting your network settings.
Once you’ve done this, wait a couple of minutes — new network settings should be picked up by your phone automatically. If nothing happens, a good old reboot is always an option, but at the end your LTE connection should be back to normal. Factory reset is always an option too, but don’t resort to it if you haven’t tried other steps first.
Contact your cell carrier
If you’ve tried everything else on the list and nothing seemed to fix your problem, it’s time to contact your cell carrier. You can always do so on social media, but sometimes a good old-fashioned call might address your concerns better. Here are the customer support numbers of the major US providers:
- Verizon Wireless: 800-922-0204
- Sprint: 888-211-4727
- AT&T: 611 from an AT&T phone or 800-331-0500
- T-Mobile: 611 from a T-Mobile phone or 1-877-746-0909 from another phone
- U.S. Cellular: 611 from a U.S. Cellular phone or 1-888-944-9400 from another phone
Verizon’s 5G network now available in 31 US cities (Update: More cities added)
5G has arrived – here’s what you can expect from AT&T
Get your phone checked out for hardware problems
Sometimes a disappearing or inconsistent LTE connection is the fault of hardware. If you’ve recently dropped your device that could have resulted in damage to internal components. Take it to an authorized repair shop to get it checked out. If your device is brand new, on the other hand, but still experiencing consistent connection issues, you might have a faulty unit.
Connection problems can be the result of damaged or faulty hardware.
Contact the smartphone manufacturer or carrier you bought it from immediately. In most cases you will have to send in your device to get it checked out. Make sure you back it up before handing it in. If faulty, in most cases you should get a replacement unit in a reasonable amount of time.
These are our tips and tricks on fixing your LTE connection. Did we manage to help you solve your issue? Let us know in the comments below.
Read next:How to fix the Google Play Store “download pending” error