3rd Generation Partnership Project (3GPP) associates accommodated consistently to coact and actualize cellular communications standards. Currently, 3GPP is defining standards for 5G. Altered groups, anniversary with a specific focus area, accomplish up 3GPP. Figure 1 shows an overview of the structure. It focuses on the lower layers, the concrete (PHY) bandage as authentic by RAN1, the MAC bandage as authentic by RAN2, and, in some cases, the PHY bandage analysis as authentic by RAN4.
5G KPIs and 3GPP’s Timeline
The International Telecommunication Union (ITU) has put alternating some requirements for 5G that focus on accomplishing three key achievement indicators (KPIs):
■ >10 Gb/s aiguille abstracts ante for the added adaptable broadband (eMBB)
■ >1 M/km2 connections for massive machine-type communications (MMTC)
■ <1 ms cessation for ultra-reliable low-latency communications (URLLC).
The table beneath provides an overview of specific abstruse requirements laid out as the 2020 minimum requirements.
3GPP has a authentic absolution timeline, apparent in Figure 2, to ensure that the approved accent of releases amid 4G and 5G continues and that the accepted is delivered on time. The agenda for Absolution 15 has been accelerated back the timeline was initially released, but Absolution 16 is still planned for 2020 to adjust with the ITU.
5G NR TIMELINE
■ Overall timeline had been agreed at RAN#75 in March 2017
■ This time plan still holds
■ RAN#77 took some key measures to ensure timeline is met
Release 15 was assured at the June 2018 RAN absolute meeting. However, some issues still charge to be advised and solutions charge to be formalized. A backward bead is scheduled
in December 2018 to altercate New Radio to New Radio (NR-NR) bifold connectivity (DC). Specifically, options 4 and 7 for DC are planned to be treated. Figure 3 shows Illustrations for these two options.
Release 15 Detailed Overview
Defining an absolute new accepted for 5G is a ample undertaking. 3GPP has breach the 5G accepted into two releases: Absolution 15, which corresponds to NR Appearance 1, and Absolution 16, which corresponds to NR Appearance 2. In NR Appearance 1, there are accepted elements amid LTE and NR, such as both application erect abundance analysis multiplexing (OFDM).
However, there are additionally differences as abbreviated in Table 2.
To absolutely apparatus the abounding adaptation of NR, a massive bulk of new accouterments charge be deployed. To abide application absolute hardware, a phased admission has been proposed. There is a non-standalone (NSA) adaptation that will use the LTE bulk and a standalone (SA) adaptation that will use an NR bulk and be absolutely absolute of the LTE bulk network.
To accumulate beeline which accessories can acquaint with anniversary other, new analogue has been introduced:
■ LTE eNB—Device that can affix to the EPC or the accepted LTE bulk network
■ eLTE eNB—Evolution of the LTE eNB that can affix to the EPC and NextGen core
■ gNB —5G NR agnate of the LTE eNB
■ NG—Interface amid the NextGen bulk and the gNB
■ NG2—Control even interface amid bulk arrangement and RAN (S1-C in LTE)
■ NG3—User even interface amid the bulk arrangement and RAN (S1-U in LTE)
Keeping this analogue in mind, the three diagrams from 3GPP TR 38.804 (draft v0.4) apparent in Figure 4 and Figure 5 allegorize assorted deployment scenarios for 5G NR.
Figure 4 shows in the larboard diagram a bureaucracy breadth a accessory corpuscle NSA operation of the NR gNBs connects to the LTE EPC. The angel on the appropriate shows a book breadth the NextGen bulk is added. The eLTE eNB acts as the master. The NR gNBs are in NSA admission with a authentic aisle for abstracts breeze amid the eLTE eNB and the NR gNB with the NextGen bulk as the master. Figure 5 shows an another deployment book with a phased change to add standalone operation. All the deployment types can accomplish accompanying as this phased admission is enacted. The exact timing and phasing of the new deployments depend on alone arrangement providers.
For NSA operation, there needs to be a accommodating abundance plan amid LTE and NR for bifold connectivity. Table 3 shows how assorted LTE bands accord to proposed NR abundance ranges.
There is accession about accurate bands for NR, but the frequencies are still not durably set, abnormally for mmWave. From the RAN4 affair captivated in May 2018, Table 4 shows the proposed operating bands. Of note, bandage n261 has been added and, added interestingly, bandage n259, authentic in the old versions as 31.8 GHz–33.4 GHz TDD, has been removed. This bandage was originally alleged out as a bandage for study, but CEPT removed it for application for 5G in November 2017.
Other bands, such as 24.25 GHz–29.5 GHz, are actuality actively advised for use in 5G NR. This is actuality tracked and actively adapted as a allotment of Abstruse Address 38.815. The beneath abundance chart, taken from that report, provides a acceptable beheld overview of the frequencies of absorption in assorted locations.
The numerology for NR is advised to action in both the sub-6 GHz bands as able-bodied as mmWave bands. This is accomplished by creating assorted numerologies formed by ascent a basal subcarrier agreement (SCS) by accumulation N breadth 15 kHz is the baseline SCS and N is a ability of 2. The numerology is called apart of the abundance band, with accessible SCS of 15 kHz to 480 kHz.
Not all SCS options are actuality proposed for all frequencies. For sub 6 GHz, alone 15 kHz, 30 kHz, and 60 kHz are to be used. Above 6 GHz, there is no accommodation yet. The applicant SCSs are 60 kHz, 120 kHz, and 240 kHz with 480 kHz apparent for approaching study. The achievability of anniversary of these will be advised based on appearance babble models, approach bandwidth, fast Fourier transform (FFT) size, and which account they are to abutment (eMBB, URLLC, or mMTC). These SCSs are not applicative to all bands and are applicative to common/dedicated abstracts channels. Table 5 summarizes these combinations.
Some genitalia of the numerology are flexible, like the SCS, while others are fixed. The subframe continuance is anchored to 1 ms and the anatomy breadth is 10 ms. Accustomed subcarrier agreement of 15 kHz* 2n, anniversary attribute length, including the CP, of 15 kHz equals the sum of the agnate 2n syms of the SCS. The aboriginal OFDM attribute in 0.5 m is best by 16 Ts (assuming 15 kHz and FFT admeasurement of 2,048) compared to added OFDM syms. 16 Ts is acclimated for the CP for the aboriginal sym. NR supports an continued CP.
For NR, a aperture is authentic as 7 or 14 OFDM syms for subcarriers up to 60 kHz and 14 OFDM syms for subcarrier agreement college than 60 kHz. A aperture can accommodate all downlink, all uplink, or at atomic one downlink allotment and at atomic one uplink part. Abstracts manual can bulk assorted slots. Figure 8 shows an archetype numerology in a aperture that uses alloyed numerology in both abundance breadth and time domain.
The NR accentuation and waveforms accept some commonalities with LTE but aim to accept abundant college ashen efficiency. NR supports QPSK, 16 QAM, and 256 QAM with the aforementioned afterlife mapping as LTE. An OFDM-based waveform is support. At atomic up to 40 GHz, CP-OFDM waveform supports ashen appliance of Y greater than that of LTE, breadth Y=90% for LTE. Y as a percent is authentic as manual bandwidth agreement disconnected by approach bandwidth* 100%. The proposed Y, for archetype is 98 percent. For uplink only, DFT-S-OFDM- based waveforms are additionally supported, but they are bound to distinct beck transmissions.
Both CP-OFDM- and DFT-S-OFDM-based waveforms are binding for user accessories (UE).
NR defines concrete ability block (PRB) breadth the cardinal of subcarriers per PRB is the aforementioned for all numerologies. The cardinal of subcarriers per PRB is N=12. Beneath is a diagram of this.
An breadth that has not yet been caked for NR is the best approach bandwidth. RAN1 agreed to a best approach bandwidth of 400 MHz in Absolution 15, but the afterward are listed for added study:
Sub 6 GHz: MHz –200 MHz range
Above 6 GHz: MHz–1 GHz range
Possibility to abutment best approach bandwidth with carrier aggregation
Carrier accession allows for the use of spectrum that is beyond than the best approach bandwidth. This is of accurate absorption for mmWave breadth there are 800 MHz- and 1.2 GHz-wide channels accessible for use. Table 6 shows the companies proposing best approach bandwidths beyond altered frequencies.
Multiple input, assorted achievement (MIMO) operation is a key basic of NR. The gNB has two TXRUs per polarization, which are affiliated to cantankerous polarized Tx antenna panels. The gNB selects one analog axle on anniversary antenna console animosity for the downlink abstracts manual (that is, MIMO transmission). The UE should be able to admeasurement assorted Tx beams swept on altered time units on anniversary console animosity and again baddest one Tx axle that is bent to be the “best” axle on each.
Synchronization in NR is authentic by synchronization arresting (SS) blocks, bursts, and admission sets. The NR-PSS, NR-SSS, and/or the NR-PBCH arresting are transmitted aural an SS block. One or assorted SS blocks compose an SS burst. One or assorted SS bursts added compose an SS admission set. From the UE perspective, the SS admission set manual is periodic. This abstraction is best declared visually. Figure 11 shows the architecture of an SS admission and Figure 12 shows the SS admission set structure.
Finally, to complete Absolution 15, the approach coding for NR has been absitively and it differs from LTE for both the abstracts and the ascendancy channels. LTE uses turbo coding for the abstracts approach and NR uses LDPC coding. For the Downlink Ascendancy Information (DCI) ascendancy channel, LTE uses coil coding and NR uses arctic coding. These coding techniques are authentic for the eMBB use case. It is accessible that altered coding techniques may be acclimated in the added NR use cases in the future.
Channel coding techniques for NR should abutment advice block admeasurement K adaptability and codeword admeasurement flexibility. Amount analogous like biting and/or alliteration supports 1-bit granularity in codeword size. The approach coding address for abstracts channels of NR supports both incremental back-up (IR) and hunt (C). For actual baby block lengths breadth repetition/ block coding is used, it may be adopted to use accumulation (CC) HARQ.
Looking Forward: Absolution 16 Abstraction Items and Trends
Work for Absolution 16 has already amorphous and some trends are emerging. There is accretion abutment of vertical industries such as non-terrestrial networks (NTN), agent to aggregate (V2X), accessible safety, and Industrial Internet of Things (IoT). For NTN, NR Absolution 15 will charge to be adapted to abutment accessory communications, accurately at mmWave bands. For V2X, added abstraction is proposed for activating abutment for sidelink (PC5) as able-bodied as admission arrangement (Uu) interfaces. New appraisal alignment is actuality authentic for V2X use cases including agent platooning, avant-garde active to accredit semi-automated or absolutely automatic driving, and alien driving. Added trends and accessible abstraction items accommodate actionable admission (NR-U), added MIMO studies (in accurate >6 GHz), chip admission and backhaul (IAB), and non-orthogonal assorted admission (NOMA) waveforms. Added applications and abstraction items will absolutely appear as assignment for Absolution 16 continues. The 2020 ambition for achievement of 5G is aggressive accustomed the bulk of accomplishment still appropriate to accomplish Absolution 16 successful. But, if the clip stays at the amount it was for Absolution 15, it is an accessible goal.
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