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Content for  TR 36.763  Word version:  17.0.0

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1 Scope  2 References  3 Definitions of terms, symbols and abbreviations 
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1  Scope  Word‑p. 8

At the RAN#86 meeting, a new Study Item was approved for Internet of Things Non Terrestrial Network (IoT NTN) and revised in RAN#91 [4]. There was an email discussion on [91E][42][NTN_IoT_Roadmap] In RAN#91 with moderator summary and final proposal for GTW input in [5].
In RAN#91-e GTW session, the Chairman endorsed a Way Forward Proposal in [6] on email discussion on [50][New_proposals_approval]. This included guidance from RAN Chairman for NTN NR and NTN IoT as follows
  • RAN#92E (June) to finalize the scope and project plan to deliver the essential minimum functionality of both NTN NR and NTN IoT (both NB-IoT and eMTC) within the existing TU allocations
  • Detailed scoping exercise (NTN NR WID revision, NTN IoT WID approval) to be undertaken at RAN#92E (June)
The objectives for this document are, based on the outcomes of the Release-17 NR NTN WI [7] and Release-16 TR 38.821, to study a set of necessary features/adaptations enabling the operation of the IoT NTN for 3GPP Release 17 with a priority on satellite access.
The first objective of this Study is to identify scenarios applicable to NB-IoT/eMTC [RAN1, RAN2], including:
  • Bands of interest in sub 6 GHz
  • Device type with PC3 or PC5 (LEO and GEO)
  • Satellite constellation orbit LEO and GEO
  • Transparent payload.
  • Link budget
The second objective is, for the above identified scenarios, to study and recommend necessary changes to support NB-IoT and eMTC over satellite, reusing as much as possible the conclusions of the studies performed for NR NTN in TR38.821. This objective will address the following items:
  • Aspects related to random access procedure/signals [RAN1, RAN2]
  • Mechanisms for time/frequency adjustment including Timing Advance, and UL frequency compensation indication [RAN1, RAN2]
  • Timing offset related to scheduling and HARQ-ACK feedback [RAN1, RAN2]
  • Aspects related to HARQ operation [RAN2, RAN1]
  • General aspects related to timers (e.g. SR, DRX, etc.) [RAN2]
  • RAN2 aspects related to idle mode and connected mode mobility [RAN2]
    • RLF-based for NB-IoT
    • Handover-based for eMTC
  • System information enhancements [RAN2]
  • Tracking area enhancements [RAN2]
Recommendations for NB-IoT and recommendations for eMTC will be documented in the conclusions.
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2  References  Word‑p. 9

The following documents contain provisions, which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications"
[2]
TR 38.811: v15.2.0 "Study on New Radio (NR) to support non-terrestrial networks (Release 15)"
[3]
TR 38.821: v16.0.0 "Solutions for NR to support non-terrestrial networks (NTN) (Release 16)"
[4]
RP-210868, "New Study WID on NB-IoT/eTMC support for NTN", MediaTek, RAN#91-e, March 2021
[5]
RP-210915, "Moderator's summary for email discussion [91E][42][NTN_IoT_roadmap]", Ericsson (RAN1 Vice-Chair), RAN#91-e, March 2021
[6]
RP-210906, Way forward on new proposals, Nokia (RAN Chair), RAN#91-e, March 2021
[7]
RP-210908, "Solutions for NR to support non-terrestrial networks (NTN)", Rapporteur (Thales), RAN#91-e, March 2021
[8]
TR 38.821: "Solutions for NR to support non-terrestrial networks", V16.0.0 (2019-12)
[9]
TR 38.811: v15.2.0 "Study on New Radio (NR) to support non-terrestrial networks (Release 15)"
[10]
TS 37.340: "NR; Multi-connectivity; Overall description"
[11]
R1-2103897, Rapporteur (MediaTek), Text proposal for TR 36.763 for RAN1#104bis-e Agreements, RAN1#104bis-e, Apr 2021
[12]
TR 45.820: v13.1.0 "Cellular system support for ultra-low complexity and low throughput Internet of Things (CIoT) (Release 13)"
[13]
TS 22.261: "Service requirements for the 5G system; Stage 1 (Release 16)"
→ to date, withdrawn by 3GPP
[14]
R2-1901404: "IoT Device Density Models for Various Environments", Vodafone, RAN2 #105
[15]
TS 36.331: "E-UTRA Radio Resource Control (RRC) protocol specification (Release 16)"
[16]
TS 36.322: "E-UTRA Radio Link Control (RLC) protocol specification (Release 16)"
[17]
TS 36.323: "E-UTRA Packet Data Convergence Protocol (PDCP) specification (Release 16)"
[18]
R2-2011275: "[IoT-NTN] Applicability of TR 38.821 (MediaTek)"
[19]
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); UE Procedures in Idle Mode (Release 16)"
[20]
TS 36.321: "Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification (Release 16)"
[21]
R2-2106169: "Connection density evaluation for IoT NTN devices", Ericsson, RAN2 #114-e
[22]
R2-2105662: "Paging evaluation for NTN IOT", Huawei, HiSilicon, RAN2 #114-e
[23]
R2-2106729: "On Paging Capacity Evaluation for IoT-NTN", Nokia, Nokia Shanghai Bell, RAN2 #114-e
[24]
R2-2105371: "Paging capacity evaluation for IoT NTN", ZTE Corporation, Sanechips, RAN2 #114-e
[25]
R2-2104033: "Summary of [Post113-e][055][IoT NTN] Performance evaluation", Ericsson, RAN2 #113bis-e
[26]
R1-2103962, Summary #3 of AI 8.15.1 Scenarios applicable to NB-IoT/eMTC, Moderator (MediaTek), RAN1#104bis-e, April 2021
[27]
R1-2104573, Link budget result calibration Spreadsheet for IoT NTN, RAN1#104bis-e, April 2021
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3  Definitions of terms, symbols and abbreviations  Word‑p. 10

3.1  Terms

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Availability:
% of time during which the RAN is available for the targeted communication. Unavailable communication for shorter period than [Y] ms shall not be counted. The RAN may contain several access network components.
Feeder link:
wireless link between NTN Gateway and satellite.
Geostationary Earth orbit:
circular orbit at 35,786 km above the Earth's equator and following the direction of the Earth's rotation. An object in such an orbit has an orbital period equal to the Earth's rotational period and thus appears motionless, at a fixed position in the sky, to ground observers.
Low Earth Orbit:
orbit around the Earth with an altitude between 300 km, and 1500 km.
Medium Earth Orbit:
region of space around the Earth above low Earth orbit and below geostationary Earth Orbit.
Minimum Elevation angle:
minimum angle under which the satellite or UAS platform can be seen by a terminal.
Mobile Services:
a radio-communication service between mobile and land stations, or between mobile stations.
Mobile Satellite Services:
a radio-communication service between mobile earth stations and one or more space stations, or between space stations used by this service; or between mobile earth stations by means of one or more space stations.
Non-Geostationary Satellites:
satellites (LEO and MEO) orbiting around the Earth with a period that varies approximately between 1.5 hour and 10 hours.
Non-terrestrial networks:
networks, or segments of networks, using an airborne or space-borne vehicle to embark a transmission equipment relay node or base station.
NTN-gateway:
an earth station or gateway is located at the surface of Earth, and provides sufficient RF power and RF sensitivity for accessing to the satellite. NTN Gateway is a transport network layer (TNL) node.
On Board processing:
digital processing carried out on uplink RF signals aboard a satellite or an aerial.
On board NTN eNB:
eNB implemented in the regenerative payload on board a satellite.
On ground NTN eNB:
eNB of a transparent satellite payload implemented on ground.
One-way latency:
time required to propagate through a telecommunication system from a terminal to the public data network or from the public data network to the terminal.
Regenerative payload:
payload that transforms and amplifies an uplink RF signal before transmitting it on the downlink. The transformation of the signal refers to digital processing that may include demodulation, decoding, re-encoding, re-modulation and/or filtering.
Round Trip Delay:
time required for a signal to travel from a terminal to the sat-gateway or from the sat-gateway to the terminal and back.
Satellite:
a space-borne vehicle embarking a bent pipe payload or a regenerative payload telecommunication transmitter, placed into Low-Earth Orbit (LEO), Medium-Earth Orbit (MEO), or Geostationary Earth Orbit (GEO).
Satellite beam:
a beam generated by an antenna on-board a satellite.
Service link:
radio link between satellite and UE.
Transparent payload:
payload that changes the frequency carrier of the uplink RF signal, filters and amplifies it before transmitting it on the downlink.
User Connectivity:
capability to establish and maintain data transfer between networks and terminals.
User Throughput:
data rate provided to a terminal.
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3.2  Symbols  Word‑p. 11

Void

3.3  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
CHO
Conditional Handover
DRX
Discontinuous Reception
ECEF
Earth-Centred, Earth-Fixed
eDRX
Extended DRX
EIRP
Equivalent Isotropic Radiated Power
GEO
Geostationary Earth Orbiting
eNB
E-UTRAN Node B
GW
Gateway
LEO
Low Earth Orbiting
Mbps
Mega bit per second
MEO
Medium Earth Orbiting
MS
Mobile Services
MSS
Mobile Satellite Services
NGEO
Non-Geostationary Earth Orbiting
NTN
Non-Terrestrial Network
PSM
Power Saving Mode
PUR
Preconfigured Uplink Resource
RAN
Radio Access Network
RTD
Round Trip Delay
Rx
Receiver
SNR
Signal-to-Noise Ratio
TA
Timing Advance
TA
Tracking Area
TAC
Tracking Area Code
TAU
Tracking Area Update
TLE
Two-Line Element
UAS
Unmanned Aircraft System
UE
User Equipment
WI
Work Item
WID
Work Item Description
WUS
Wake Up Signal
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