Operators are spending millions of dollars just on the license only. It is expected that TDD spectrum will be sold at lower price as compared to FDD spectrum and secondly the TDD spectrum is also available in many countries. So certainly there is emerging interest in TD-LTE. Some of the main advantages of TD-LTE over FDD-LTE are as follows
In FDD LTE (Frequency division duplex)
In FDD LTE (Frequency division duplex)
- duplexing scheme requires paired spectrum which in other words means that the downlink and uplink transmission should be on different frequency spectrum
- There is wastage of frequency resources in up-link if most UEs in the cells are using downlink spectrum most the time or vice versa (For example if most users in he cells are watching YouTube or downloading some files)
- Since different range of frequencies are used in uplink and downlink, therefore channel characteristics are different in both directions. UE needs to report the downlink channel characteristics to the eNB on its uplink channels
- Additional hardware required on UE and eNB side to separate uplink and downlink frequencies which adds extra cost to the terminals and base stations
Now in TD-LTE (Time division duplex) ?
- Paired spectrum is not required and both downlink / uplink communication occurs on single frequency channel
- Channel characteristics are same for both uplink and downlink channels
- Hardware cost is low, no need of diplexer in UE and eNB
- Spectrum is efficiently utilized since UEs can use all the slots for downlink traffic if there is no uplink traffic
TD-LTE frame structure is shown in the figure below
Subframe 0 and 5 carries synchronization signals and system information blocks
Subframe 1 is special subframe that is used to carry information for switching between uplink and downlink for 10ms switching period
For 5 ms switching period both subframe 1 and 6 are used
H-FDD (Half-Duplex FDD)is also an option that can used in LTE which was basically proposed by Nokia in 1999 for incorporation in high spectral efficient user terminals like LTE. What about the option of using this technique for LTE as it can heavily relieve up-link interference while the down-link capacity is preserved.
ReplyDeleteThe main reason for H-FDD is to reduce terminal cost specially for multiple-band supporting devices. The current standard does support this but I believe there is not yet any big need for it..
DeleteSuch an awesome post, I was looking for this information finally got from your blog thanks for sharing.
ReplyDeleteRegards
charter spectrum
Nice article.Thank you for providing this informative article.This article helped me in a great extent.This is really interesting to read this.Although the language used here is simple and awesome.Every reader will get some useful information from here.Visit essay writing service to get more details.
ReplyDeleteGreat Article. Thank you for sharing! Really an awesome post for every one.
DeleteAdding Support for Automatic Enforcement of Security Policies in NFV Networks Project For CSE
Automated Self Optimization in Heterogeneous Wireless Communications Networks Project For CSE
Battle of Opinions Over Evolving Social Networks Project For CSE
Detecting and Mitigating Points of Failure in Community Networks A Graph Based Approach Project For CSE
Dynamic Cloud Network Control Under Reconfiguration Delay and Cost Project For CSE
High Capacity 5G Fronthaul Networks Based on Optical Space Division Multiplexing Project For CSE
There is wastage of frequency resources in up-link if most UEs in the cells are using downlink spectrum most the time or vice versa. Field-Service-Lightning-Consultant dumps
ReplyDeleteWelcome to suplexmedshop Online Drugstore, BUY Xanax Online without prescription.
ReplyDeleteLooking to buy prescription drugs online discreetly?
You are at the right place! Here, you can buy drugs online without prescription and have it shipped and delivered to your location.
As part of our expansion, we equally ship to all 50 States within the USA, The UK, Canada, Australia and a whole lot of countries worldwide.
Buying prescription drugs like Actavis Promethazine – Codeine Cough Syrup has never been easier.
We equally employ the most discreet payment methods, Bitcoin being one of many. All to ensure your safety and discretion is guaranteed.
Buy Drugs Online Without Prescription .Actavis
Promethazine Cough Syrup with codeine and Morphine Sulphate for Sale Online Without Prescription.
Actavis Promethazine.
How should I take Adderall?,
BUY Xanax Online
Buy Adderall Online
BUY DEMEROL ONLINE
BUY Promethazine Codeine
BUY ECSTACY ONLINE
BUY VYVANSE ONLINE
BUY Oxycodone ONLINE
An impressive share, I just given this onto a colleague who was doing a little analysis on this. And he in fact bought me breakfast because I found it for him.. smile. So let me reword that: Thnx for the treat! But yeah Thnkx for spending the time to discuss this, I feel strongly about it and love reading more on this topic. If possible, as you become expertise, would you mind updating your blog with more details? It is highly helpful for me. Big thumb up for this blog post!
ReplyDeleteCompleted.com
Information
Click Here
I am often to blogging and i really appreciate your content. The article has really peaks my interest. I am going to bookmark your site and keep checking for new information.
ReplyDeletePejawaran.banjarnegarakab.go.id
Information
Click Here
Very nice post, i certainly love this website, keep on it
ReplyDeleteSlideserve.com
Information