IEEE Consumer Electronics Magazine - November/December 2020 - 36

5G in Consumer Electronics

Figure 1. Thermal Radiation (TR) mode incorporating half-duplex radio.

ADAPTIVE FRAME STRUCTURE
DESIGN FOR TR MODE IN 5G NR
The waveforms supported in 5G NR are similar
to LTE, which include CP-OFDM (UL/DL) with DFTs-OFDM (UL). There is a flexible numerology support in 5G NR with 15 KHz à 2n subcarrier spacing
ranging from 15 to 240 KHz. For the first frequency
band (0.45-6 GHz), the maximum bandwidth support is up to 200 MHz and for 24-52.6 GHz, maximum of 400 MHz bandwidth is supported.12 The
proposed frame structure for 5G NR is depicted in
Figure 2 keeping the LTE frame format as basis,
along with the supported duplex schemes for
spectrum allocation. One radio frame consists of
ten subframes each of 1 ms duration.
Each subframe of 1 ms duration consists of
two slots of 0.5 ms each, 14 OFDM symbols. The
resource block, which is smallest unit of resource
allocation to a user, is of one slot duration consisting of 12 subcarriers and seven OFDM symbols in each slot. For enhanced services in 5G NR,
such as ultra-reliable low latency communication
(URLLC) services, minislot length of two, four, or
seven symbols are defined in the 5G NR standard
so far. This provides fast transmission opportunities for services requiring very low latency that is
not restricted by slot boundaries. Thus, minislots

36

provide a viable solution to low-latency transmissions irrespective of subcarrier spacing. As the
subcarrier spacing increases, the slot duration
decreases.

Figure 2. Proposed Frame format (FDD and TDD
frame type) for TR mode.

IEEE Consumer Electronics Magazine



IEEE Consumer Electronics Magazine - November/December 2020

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