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. The standard is frequency agnostic, meaning any subcarrier configuration can be used on any band.
What is subcarrier spacing?
Why are there multiple subcarrier spacing in 5G?
What is subcarrier spacing SCS?
What is radio frame in LTE?
In LTE, DL and UL transmissions are organized into radio frames of 10 ms each. Each frame is divided into ten equally sized subframes. The duration of each subframe is 1 ms. Moreover, each subframe is further divided into two equally sized time slots, that is, each slot is 0.5 ms.
What is LTE resource block?
A resource block (RB ) is the smallest unit of resources that can be allocated to a user. The resource block is 180 kHz. wide in frequency and 1 slot long in time.
What is a resource block in 5G?
A resource block (a.k.a physical resource block – PRB) is a block of N RBsc = 12 subcarriers over which the transmissions are scheduled. 5G NR physical layer uses time-frequency resource (physical resource block) for transmission.
What is LTE numerology?
In LTE, there is only type of numerology or subcarrier spacing (15 KHz), whereas in NR, multiple types of subcarrier spacing are available e.g 5G NR supports subcarrier spacing of 15, 30, 60, 120 and 240 KHz. As you see in below picture, each numerology is labled as a parameter (u, mu in Greek).
What is a frame in 5G?
A frame has duration of 10 ms which consists of 10 subframes having 1ms duration each similar to LTE technology. Each subfame can have 2μ slots. Each slot typically consists of 14 OFDM symbols.
How many slots are in a 5G frame?
In this configuration, a subframe has 16 slots in it, it means a radio frame contains 160 slots in it.
What is bandwidth part?
A bandwidth part is a subset of contiguous common physical resource blocks (PRBs). A UE can be configured with up to four BWPs in the uplink or four BWPs in the downlink. An additional four BWPs can be configured in a supplementary uplink. Only one BWP in the UL and one in the DL are active at a given time.
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.
What is a PRB in 5G?
PRB refer to block assigned to user by scheduler. In 5G we have VRB to PRB mapping which depends on Downlink resource allocation type, it can be interleaved or non inter leaved.
What is a subcarrier in LTE?
A subcarrier is a secondary modulated signal frequency modulated into the main frequency (the carrier) to provide an additional channel of transmission. It allows for a single transmission to carry more than one separate signal.
What is re in LTE?
Reading various LTE specification, you will see many terms which seems to be related to resource allocation but looks very confusing. At least you have to clearly understand the following units. Resource Element(RE) : The smallest unit made up of 1 symbol x 1 subcarrier.
What is a symbol 5G?
If you see just the “5G” symbol, that means you’re connected to standard 5G, on the sub-6GHz spectrum. This spectrum can be faster than LTE but slower than mmWave and higher-frequency 5G bands.
What is the numerology in 5G?
5G NR Numerology varies from 0 to 4 indicating different types of Subcarrier spacing from 15 KHz to 240 KHz. Numerology-4 : 240 kHz sub-carrier spacing can be used to provide broadcast signals at millimeter-wave.
What is resource grid in LTE?
– A resource grid is characterized by one subframe in time domain and full carrier bandwidth in the frequency domain. – There are a set of resource grids per transmission direction (uplink or downlink).
What is subcarrier spacing in LTE?
In LTE, each subcarrier is spaced 15 kHz apart. These subcarriers are combined in groups of 12 to form a single resource block. Each resource block is used in an OFDMA arrangement to send data to different handsets or combined for high-speed data.
What is a resource block in LTE?
A resource block (RB ) is the smallest unit of resources that can be allocated to a user. The resource block is 180 kHz. wide in frequency and 1 slot long in time.