What is the difference between td lte and fdd lte

Yet as spectrum becomes more costly and scarce, TDD will become more widely adopted as spectrum is reallocated and repurposed. Please contact us with any questions on CableFree Wireless Technology. You must be logged in to post a comment. Skip to content. Frequency Division vs. Time Division Duplexing in Wireless Communications Frequency Division Duplex FDD requires two separate wireless communications channels on separate frequencies, one for transmit and the other for received data.

Share this: Click to email this to a friend Opens in new window Click to share on Twitter Opens in new window Click to share on Facebook Opens in new window. Loading Comments Sorry, your blog cannot share posts by email. Requires paired spectrum with sufficient frequency separation to allow simultaneous transmission and reception. Lower cost as no diplexer is needed to isolate the transmitter and receiver. As cost of the UEs is of major importance because of the vast numbers that are produced, this is a key aspect.

Channel propagation is the same in both directions which enables transmit and receive to use on set of parameters. Channel characteristics different in both directions as a result of the use of different frequencies.

It is therefore not possible to make dynamic changes to match capacity. Regulatory changes would normally be required and capacity is normally allocated so that it is the same in either direction. Guard period required to ensure uplink and downlink transmissions do not clash. Large guard period will limit capacity. Larger guard period normally required if distances are increased to accommodate larger propagation times. Besides, most telcos have a so-called fair usage policy wherein speed drops after reaching a specified download limit.

In theory at least, 4G which is a marketing term for LTE should have data speeds capable of reaching megabits per second while on the move, and 1GB per second when stationary. Ericsson Inc. You may compare this to how you make voice calls over an instant messaging tool like WhatsApp. Airtel claims its customers with mobile devices that support 4G Advanced will be able to enjoy 4G data speeds of over Mbps—in effect, all those users with high-end smartphones.

The buzz on fifth-generation, or 5G, technology is getting stronger. The speed of 5G is much faster than 4G—20 gigabits per second, fast enough to download HD movies in a span of seconds—and is expected to be the driver for trends such as the internet of things and initiatives such as smart cities and Digital India.

However, 5G networks are not expected to roll out until and the International Telecommunication Union is still working on 5G standards. Also Read: Mobile price wars: Airwave auction set for flop show as debt pile on telcos.

Never miss a story! Stay connected and informed with Mint. Download our App Now!! It is essential that any cellular communications system must be able to transmit in both directions simultaneously. This enables conversations to be made, with either end being able to talk and listen as required. Additionally when exchanging data it is necessary to be able to undertake virtually simultaneous or completely simultaneous communications in both directions.

It is necessary to be able to specify the different direction of transmission so that it is possible to easily identify in which direction the transmission is being made. There are a variety of differences between the two links ranging from the amount of data carried to the transmission format, and the channels implemented.

The two links are defined:. In order to be able to be able to transmit in both directions, a user equipment or base station must have a duplex scheme. There are two forms of duplex that are commonly used, namely FDD, frequency division duplex and TDD time division duplex..

Accordingly they may be used for different applications, or where the bias of the communications is different. These are naturally reflected into LTE. Although it is possible in TD-LTE to change the percentage of time that is occupied by the up and downlink, this is not as easy as it may appear at first sight. LTE Duplex schemes It is essential that any cellular communications system must be able to transmit in both directions simultaneously.

The two links are defined: Uplink: the transmission from the UE or user equipment to the eNodeB or base station.