In a slot in a downlink frame, the UE shall assume that downlink transmissions only occur in ‘downlink’ or ‘flexible’ symbols. In a slot in an uplink frame, the UE shall only transmit in ‘uplink’ or ‘flexible’ symbols. The number of symbols per slot is 14 (in case of Normal CP)
What is mini slot in 5G?
➤Mini-slot occupies 2, 4 or 7 OFDM symbols. It enables non-slot based scheduling. It is minimum scheduling unit used in 5G NR. As mentioned mini-slots can occupy as little as 2 OFDM symbols and are variable in length. They can be positioned asynchronously with respect to the beginning of a standard slot.
What is slot aggregation?
The basic idea of slot aggregation and repeti- tion is that an initial transmission of a packet can be followed by automatic repetitions of the same packet in consecutive slots. The aggregation factor (or the number of repetitions) K is configured by the higher layer.
How many subcarriers are in 5G?
5G NR can choose subcarrier spacing from 15kHz to 240kHz, with a maximum 3300 subcarriers in simultaneous use on one channel. However, channels can be no more than 400MHz wide.
What is TTI in 5G?
In the time domain, 5G NR will enable scalability to latencies much lower than what is possible in today’s LTE networks. Today, LTE supports a fixed transmission time interval (TTI) of 1 ms. … Scalable frame structure is also designed to cover all the frequency bands, from sub-6GHz all the way to mmWave bands.
What is resource block in 5G?
In 5G, One NR Resource Block (RB) contains 12 sub-carriers in frequency domain similar to LTE. In LTE resource block bandwidth is fixed to 180 KHz but in NR it is not fixed and depend on sub-carrier spacing.
What is the duration of each frame in 5G?
5G NR defines a frame to be 10 milliseconds (ms) in duration, like 4G LTE. Each frame is divided into 10 subframes of 1 ms each. The 1 ms subframe is then divided into one or more slots in 5G, whereas LTE has exactly two slots in a subframe.
What is Coreset in 5G?
In 5G NR, CORESET is known as Control Resource Set. It is a set of physical resources within a specific area in Downlink Resource Grid and used to carry PDCCH (DCI). … Frequency allocation in a CORESET configuration can be contiguous or non-contiguous.
What is codeword in 5G?
The output of a coding chain is a codeword. 5G supports transmission of up to 8 layers to a single user on the downlink. This means that there can be up to eight streams transmitted in parallel. … The coded data is then mapped to the physical downlink shared channel or PDSCH.
Why are there different subcarrier spacing in 5G?
Slot length gets different depending on different subcarrier spacing. The general tendency is that slot length gets shorter as subcarrier spacing gets wider. Actually this tendency comes from the nature of OFDM. NOTE: In LTE, there are fixed two slots per subframe, but in NR, no.
What modulation scheme does 5G use?
Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation format used in modern wireless communication systems including 5G.
What is SSB in 5G NR?
5G/NR – SS Block Home : www.sharetechnote.com. SS Block. SS Block(SSB) stands for Synchronization Signal Block and in reality it refers to Synchronization/PBCH block because Synchnronization signal and PBCH channel are packed as a single block that always moves together.
How does 5G NR work?
5G NR utilises modulation, waveforms and access technologies that will enable the system to meet the needs of high data rate services, those needing low latency and those needing small data rates and long battery lifetimes amongst others. … Release 15 forms phase one of a 5G mobile communication standard.
Does 5G use more energy?
5G networks are up to 90% more energy efficient per traffic unit than 4G networks, according to a new 5G energy efficiency study from Nokia and Telefonica.
What is TTI bundling?
TTI bundling enables a data block to be transmitted in consecutive TTIs, which are packed together and treated as the same resource during the scheduling process. TTI bundling makes use of HARQ gains and reduces the number of re-transmissions and round trip time (RTT).
What is LTE TTI?
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.