TTI bundling has been recently introduced as a feature of LTE. Rel. 8 to improve the uplink coverage. In TTI bundling, a VoIP packet is transmitted as a single. TTI Bundling optimizes the uplink (cell edge) coverage for services like VoLTE. For services such as VoIP, the packet size is small and the. TTI Bundling in FDD and TD-LTE Abstract TTI Bundling has been introduced in FDD Alternative Approach The alternative to TTI bundling is.

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This way we are avoiding delay and reducing control plane overhead at mac layer. Isn’t it too much waste of subframes?

There might be retransmissions of each of those transport blocks which will also potentially increase the control signaling overhead. During this time, he not only delivered effective hundling in a multitude of technologies to top operators, but he was also responsible for identifying and developing courseware to meet their future training needs.

Should it be always like this i. The advantage over sending the packet in a single TTI and then detecting that it wasn’t received correctly which in turn would lead to one or more retransmissions is that it saves a lot of signaling overhead.

Then Why we need this kind of method?

Latency is also reduced as no waiting time is required between the retransmissions. About Sekhar Sekhar joined Award Solutions inand has over 16 years of experience in wireless telecommunication industry with mobile cellular, digital communications technologies. When the base station detects that llte mobile can’t increase it’s transmission power and reception is getting worse it can instruct the device to activate TTI bundling and send the same packet but with different error detection and correction bits in 2, 3 or even 4 consecutive transmit time intervals.


Thus, with limited power, the UE has a better chance of a successful transmission with lesser latency using the TTI fti method. One drawback of this method is the potential overhead increase due to RLC segmentation due to multiple RLC headers needed. At first the feature name reminded me of the packet bundling that is done in Wi-Fi, which concatenates several packets into one transmission burst thereby saving a lot of air interface overhead.

Bundljng of TTI Bundling. The channel coding used in LTE enables easy generation of the multiple redundancy versions from which the transmissions in the TTI bundle are generated.

Unknown December 14, at 2: Re transmission means control plane overhead and specially the delay which is not acceptable for services like VoIP. Bhavesh Thakker February 21, at For services like VoIP this means bad end user experience.

LTE TTI Bundling – WirelessMoves

Unknown April 25, at Now you may have another question. Sekhar joined Award Solutions inand has over 16 years of experience in wireless telecommunication industry with mobile cellular, digital communications technologies. Combined processing of the redundant transmissions over multiple subframes leads to a better probability of detection of the transport block. Or is equally applicable to both? This way the chances of gundling decoding bundilng bits improve every time.

The purpose of TTI Bundling is to bunfling cell edge coverage and in-house reception for voice. DJ May 29, at 3: Rachel Johnson October 13, at What would be the advantages and drawbacks of TTI bundling compared to this other solution if it is possible to implement?

Emeka Ijere February 20, at 7: In some aspect, you bunddling say this is a kind of wasting resources. Is this ‘Not allowed’? The reciever will combine the previously recieved erroneous data with newly attempted data by the sender. This approach can also reduce the delay in the HARQ process compared to transmissions of the redundancy versions separated in time using the normal approach.

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Vicky January 15, at Therefore, in a case where the communication is for time critical communication and UE is in the area of poor coverage e.

LTE TTI Bundling

In case the bundle is not received correctly, let is repeated in the same way as an ordinary transmission of a packet. Or only in UL?

Why are the durations of the TTIs all common, or equal? Altamont April 16, at 2: The process as shown in Figure 3 is typically triggered by UE informing the eNB about its power limitations at the present state.

The simple answer is to increase the possibility of data reception at the destination. Ok here is what I understand Since UE has very limited power in uplink 23dbm LTE this means that at cell edge there can be many re transmissions in uplink due to poor radio conditions.

But the real implementation and optimization may not as easy as it sound. A single RLC Bundking is transmitted as multiple redundancy versions in consecutive subframes using a single common allocation. As shown in Figure 4, TTI bundling enables up to 4 redundancy versions of the same transport block to be sent in 4 consecutive subframes.

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