5G Millimeter Wave Frame Structure | 5G Mm Wave Frame | TDD

5G millimeter wave frame structure. Dynamic TDD frame is used in 5G mm wave system. 5G millimeter wave frame structure consists of control and data parts used for both downlink (eNB to UE) and uplink (UE to eNB).

The 5G mm wave radio frame structure defines the way transmissions from 5G eNB and UEs are relayed in the air interface. Figure below depicts one subframe. This will repeat till the duration of one 5G radio frame lasts. Hence there will be more number of subframes in a 5G radio frame.

5G millimeter wave frame follows TDD topology. The TDD refers to Time Division Duplex. The frame duration is about 10ms. The frame is composed into smaller size subframes (of duration 1ms). The subframe is made up of OFDMA symbols. Here both downlink (i.e. transmissions from eNB to UEs) and uplink (i.e. transmissions from UEs to eNB) are allocated different time instances in the subframe. Both downlink and uplink uses same RF frequencies in TDD topology at different time slots. There will be GP (Guard Period or Gap) between different parts of subframe to avoid interference.

The subframe is divided into reference, control and data parts. Reference signals are carried in each subframe are used to demodulate downlink and uplink data parts. Control part carries messages used for connection establishment and management between eNB and UE. Data part carries data payload as per application of usage by various UEs in 5G system. Subframe is further divided based on downlink only (DL only), uplink only (UL only) and bi-directional usage by UEs and eNB.

Note: This is proposed frame structure. We request to kindly refer latest updates on 5G specifications as available from 3GPP and related sites as mentioned below.
https://www.5gworkshops.com/5GCM.html
https://5g-ppp.eu/