Assuming that a cellular operator is currently using FDD LTE spectrum, how difficult (in terms of the cost and the required changes to the system) is to switch to TDD? Is it technically possible to use the same spectrum but for TDD? If not, why is that so? Is there any legacy issue? And last but not least, how difficult is for an operator to add TDD 5G to its FDD LTE network?
I would appreciate your opinion.
Dear Shaharm,
There are basic changes that must be made to change the system from FDD to TDD.
These changes may be deep such that it is better to install a new system operating using TDD time division duplexing.
My opinion is based on the required following changes:
There is a deep change in the physical layer especially the rf front end, the A/D and the D/A converter in the transmitter and the receiver. Duplexing will be also changed
There will be also change in the control layer including the data link layer.
The controllers of this layer will be changed to control the data flow on the wireless link.
The higher layers may not need any changes such as the network layer and the application layers.
I think technically the matter is complicated to modify FDD system to work in TDD mode.
May be with using the SDR software defined radio one can see for integrating these modes of operation in the early conception and design stages.
What i said remain as my insight to the problem.
Best wishes
Dear Abdelhalim,
Many thanks for sharing your insights on my question.
Best wishes
Hi.,
FDD LTE and TDD LTE are two different standards of LTE 4G technology. LTE FDD uses a paired spectrum that comes from a migration path of the 3G network, whereas TDD LTE uses an unpaired spectrum that evolved from TD-SCDMA.. FDD has inherently low latency compared to TDD. In case of FDD, both UL and DL spectrum are transmitting and receiving simultaneously. advantage to be deployed in those markets, where the requirements for low latency is crucial compared to TDD.
TDD is now allowed by regulatory and standards organisations all over the world. New technologies such as 802.16 (Wimax), 802.11 (Wi-Fi), Bluetooth, Home RF and 3G cellular all support TDD technology. Several things have changed that have made TDD a practical and in many cases preferable alternative to FDD microwave. The Galaxy S4 and S4 Mini are getting 'TDD/FDD Dual Mode LTE' ... and it would be difficult to eliminate all the possible variables to produce a meaningful answer. ... feature for end-user customers and mobile operators, especially in markets ... So phones like the new S4 and S4 Mini that can nimbly swap ..
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