Frequent question: What is the need guard period?

Guard Period is a period during which no transmission and no reception occurs. This guard period varies depending on whether it is downlink or uplink, and varies with different situations within downlink or uplink.

Why is there a guard period?

In TDMA, each user’s timeslot ends with a guard period, to avoid data loss and to reduce interference to the following user, caused by propagation delay. Thus a user’s timeslot is protected from interference from the preceding user, by the guard interval (guard period) at the end of that preceding user’s timeslot.

What is the function of GP guard period in special subframe?

In TDD , there are 9 special subframe configuration, each have different number of OFDM symbols for DwPTS,GP and UpPTS. Special subframe guard period impact the size of cell, it represent how much propagation delay it can compensate. Longer guard period can compensate more propagation delay result a longer cell size.

What is UPPT LTE?

In LTE , the radio frame structure type 2 is used for TDD operation and consists of two half-frames with a duration of 5ms each and containing each 8 slots of length 0.5ms and three special fields ( DwPTS , GP and UpPTS) which have configurable individual lengths and a total length of 1ms.

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What is SSF in LTE?

In LTE TDD special subframes are used for switching from downlink to uplink and contain three sections: DwPTS, GP, and UpPTS. But we don’t have any special subframe for switching from uplink to downlink.

What is resource block in 5G?

resource block in 5g. 5G NR is 12 consecutive subcarriers in the frequency domain. A resource block (RBResource Block) is the smallest unit of resources that can be allocated to a user.

Is 5G TDD or FDD?

In FDD mode, both uplink and downlink can transmit at the same time at different spectrum frequencies. In TDD mode, both uplink and downlink use the same spectrum frequencies but at different times.

5G TDD.

Feature 5G FDD 5G TDD
Interference with neighboring Base Stations Less More

What is DwPTS?

DwPTS. The DwPTS is used for downlink synchronization. During the cell search procedure, the UE acquires the timing of the DwPTS by correlating with the SYNC-DL code transmitted in the DwPTS. The UE must identify which SYNC-DL sequence is used out of 32 SYNC-DL possible sequences.

What is resource grid in LTE?

The subframe resource grid is represented in the LTE Toolbox as a multidimensional array of the following size. … Therefore, the resource grid represents a subframe (two slots) and whole bandwidth, since there are 12 subcarriers per resource block.

What is a subcarrier in LTE?

In addition to this the subcarriers spacing is 15 kHz, i.e. the LTE subcarriers are spaced 15 kHz apart from each other. To maintain orthogonality, this gives a symbol rate of 1 / 15 kHz = of 66.7 µs. Each subcarrier is able to carry data at a maximum rate of 15 ksps (kilosymbols per second).

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What is the Vo LTE symbol on my phone?

VoLTE means Voice over LTE. The icon notifies you that you are now able to phone over LTE. This means, it’s not necessary in order to make a phone call to switch back to 3G (You cannot phone over normal LTE). In short it’s new and better.