What is TTI in HSDPA?

What is TTI in HSDPA?

TTI, Transmission Time Interval, is a parameter in UMTS (and other digital telecommunication networks) related to encapsulation of data from higher layers into frames for transmission on the radio link layer. TTI refers to the duration of a transmission on the radio link.

What does HSDPA mean on my phone?

HSDPA (High-Speed Downlink Packet Access) is a packet-based mobile telephony protocol used in 3G UMTS radio networks to increase data capacity and speed up transfer rates.

What is the difference between R99 and HSDPA?

R99 is the original standard for UMTS WCDMA based networks. HSDPA is an add on to R99/UMTS networks which adds a shared high speed downlink packet channel. HSDPA with Class 10 devices can support on a shared channel up to 14.4Mbit/s. All of this is carried on Wideband CDMA Channels.

What is TTI LTE value?

Within each transmission time interval (TTI), corresponding to one subframe of length 1 ms, up to two transport blocks of dynamic size are delivered to the physical layer and transmitted over the radio interface for each component carrier.

Is UMTS and HSPA the same?

UMTS provides a clear evolutionary path to high-speed packet access (HSPA). HSPA refers to the combination of high-speed downlink packet access (HSDPA) and high-speed uplink packet access (HSUPA). HSPA also boosts capacity in UMTS networks and provides significant latency reductions.

What is difference between LTE and HSPA?

LTE uses the network resources more efficiently, reduces the latency in data transfer, and also simplifies the overall network architecture. HSPA, on the other hand, is a third-generation standard (3G).

What is LTE TTI bundling?

TTI Bundling is a LTE feature which improves cell edge uplink coverage, and it is used for services like VoLTE. In TTI Bundling mechanism UE sends same data with different redundancy versions (PUSCH) in multiple consecutive sub-frames and gets only one ACK/NACK for the entire bundle.

Which is shortest TTI for HSDPA or UMTS?

These two contradicting requirements determine the choice of the TTI. In UMTS Release ’99 the shortest TTI is 10 ms and can be 20 ms, 40 ms, or 80 ms. In UMTS Release-5 the TTI for HSDPA is reduced to 2ms.

Which is the highest data rate for 10 ms TTI?

Also the highest data rate supported with a 10 ms TTi is 2 Mbps. The reason for this is to limit the amount of buffer memory required in the NodeB for soft combining because a larger block transport size means that a larger soft buffer is needed for retransmissions.

What’s the highest data rate you can get with HSUPA?

Support for the E-DCH TTI (Transmission Time Interval) of 10 ms is required for all HSUPA categories. It is only some HSUPA categories that support a 2 ms TTI. Also the highest data rate supported with a 10 ms TTi is 2 Mbps.

Why are there so many categories in HSUPA?

In the same way that HSDPA has a series of categories defined, so too does HSUPA. The HSUPA categories define the basic capabilities for the handset or UE and enable the base station or Node B to communicate effectively, knowing the limits of the performance.

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