5G NR Resource Blocks

5G NR is a mobile wireless communication system using a time and frequency resource grid. It has a concept of a PRB that is different from the LTE PRB. Aside from the technical specifications, you also need to know about the resource blocks of 5G.

The resource block is used to give scheduling flexibility in the time-domain. The RB also provides a means of adjusting cell capacity by allocating more or less time in the DL. To accomplish this, the UE will have to configure its BWPs. This can be done by selecting different slot configurations. The UE will then randomly select the RB that fits into its available slots.

One Resource Element is equivalent to a single subcarrier during a single OFDM symbol. A resource element is unique because it has a number defined in the frequency domain. This number is related to the position of a subcarrier at Point A, a common reference point.

The size of a PRB is determined by its numerology and the signaling overhead. It is also important to consider the size of the resource particles that are created by the bandwidth. Increasing the Subcarrier Spacing in a UE can boost the size of the frequency-domain part of a PRB. However, this does not change the fact that the allocation of DL and UL at the symbol level remains static.

What Are 5G Resource Blocks?


In 5G NR, a Resource Block is a rectangle-shaped physical resource block. It contains 12 OFDM subcarriers. This is the same number as the number of subcarriers in LTE. This translates into one slot in the time-domain. The RB occupies the space of a 180-kHz channel.

In 5G NR, the Resource Block (RB) is a physical component. It contains 84 Resource Elements (REs), which are defined in the time-frequency domain. This allows for the possibility of transmitting data with multiple subcarrier spacings.

In 5G NR, the physical element is a time-frequency resource that is mapped across OFDM symbols. Each subcarrier within an OFDM symbol corresponds to an RB. It is the smallest physical resource in the NR.

The RB occupies one slot in the time domain. This slot is allocated by the network. The network provides the starting location of the first usable subcarrier. The shortest slot can be used to change the transmission queue. The RB is fixed for the duration of the slot.


The Resource Block is a frequency-domain concept. Each RB is a set of consecutive subcarriers. The number of subcarriers within each PRB depends on the SCS. Each SCS results in a different PRB indexing. The size of the PRB varies as well. This can cause problems with efficient resource allocation. In order to alleviate this problem, the granularity of the PRB is large. This helps reduce the increase in the number of resource particles caused by the bandwidth.

In addition to the PRB, the time-frequency resource scheduling can be described by the number of PRBs and the number of slots/symbols. This can be done by introducing a scaling factor. For example, the number of subcarriers in a PRB increases by a factor of three with an SCS of 30 kHz. The scaling factor can also be introduced into the UE downlink/uplink data rate formula. This enables a large Resource Block Group to be used for scheduling.

Layla Riley

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