Page 17 - 3GPP_Highlights_I4

RF AND RECEIVER PERFORMANCE

TOWARDS 5G-ADVANCED

By Xizeng Dai, 3GPP WG RAN4 Chair, Haijie Qiu, RAN4 Vice-

Chair, Andrey Chervyakov RAN4 Vice-Chair

The recent TSG RAN#95-e Plenary 86 RAN4 led items in Rel-17 The focus shifts to Release 18
meeting, in March 2022, finalized the For Release 17, we have worked on 86
RAN4 core RF and RRM requirements RAN4-led work or study items and The Release 18 package of RAN4 work and
for most of Release-17 non-spectrum also on the requirements for 15 work study items were approved after extensive
work items and approved the new items led by RAN1 and RAN2. Among discussions in the group and at TSG RAN
Release-18 package of RAN4-led work the RAN4-led items, we enhanced RF level in June, September, December of 2021
items and study items. requirements for Tx switching, high and February 2022. During the discussions,
the 3GPP leadership focused on keeping
3GPP TSG RAN4 is responsible power UE, transmit diversity, 1024QAM the RAN4 workload within reasonable limits,
for standardization of spectrum, and Pi/2 BPSK for sub-6GHz bands, and focusing on the most important and urgent
RF (radio frequency), and receiver uplink and downlink Carrier Aggregation demands in the industry – a task that called
performance, among which the on millimeter wave bands. RAN4 also for control of the number of items and care
receiver performance includes enhanced the RRM and demodulation in the scoping clear objectives. We now have
requirements of RRM (radio resource requirements. Besides, new scenarios a good balance between RAN4-led items
management), demodulation like high speed train on millimeter wave and impacts of items led by other working
performance and CSI (channel state bands were enabled. groups, as well as a balance between long
information) reporting. RAN4 is Regarding RAN1 and RAN2-led work term evolutions and urgent deployment
playing an important role in 3GPP items, RAN4 completed or is soon going requests.
to identify the implementation to complete RF and RRM requirements
limits to help physical layer and for non-terrestrial networks, UE power Release 18 RAN4-led items were approved
high layer designs and to specify savings, NR sidelink enhancement, NR to continue the performance enhancements
the requirements to verify devices coverage enhancement, NR extension up of UE RF in FR1 (below 7 GHz), UE RF in FR2
in order to guarantee that the to 71GHz, enhancements of IAB, reduced (below 71 GHz), RRM, measurement gaps and
performance in the field can meet capability NR devices, etc. demodulation, as shown below:
the goal of design.

UE FR1 RF UE FR2 RF RRM enhancements Measurement gap enh Demodulation
enhancements enhancements performance
• SCell activation • Joint requirements for requirement
• 4Tx for CPE/FWA/ • Requirement for enhancements in FR2 pre-configured MG, enhancements
vehicle/industrial FR2 multi-Rx chain DL (i.e., reduction of concurrent MG and
devices reception SCellactivation delays) NCSG • Advanced receiver
to cancel inter-user
• 8Rx for CPE/FWA/ • UL 256QAM • FR1-FR1 NR-DC RRM • NeedForGap interference for
vehicle/industrial requirements requirements MU-MIMO
devices • Beam correspondence
requirements for RRC_ • Inter-RAT NR and [LTE] • ATP (Absolute
• Lower MSD INACTIVE and initial measurement without ThroughPut)
access gaps
In addition, more targeted work and study items were also approved for the following areas:
• Simplification of band combination specification • Enhancement for 700/800/900MHz band combinations
• Base Station (BS) RF requirement evolution for millimeter wave multi-band BS • FR2 high-speed train enhancement
• Over-the-air (OTA) testing enhancement, for FR2-1 OTA testing for UEs with multi-panel reception and 4DL layer
• EMC enhancements • Support of intra-band non-collocated E-UTRA, NR Dual Connectivity - EN-DC/NR-CA deployment
• NB-IoT (Narrowband IoT)/eMTC (enhanced Machine Type Communication) core & performance requirements for Non-
Terrestrial Networks • Air-to-ground (BS on the ground, CPE in the air)
• NR support for dedicated spectrum less than 5MHz for FR1 (which was approved in RAN#94-e December 2021)
One quarter after 3GPP RAN1, RAN2 and RAN3 working groups started their 5G-Advanced work, RAN4 is also on the exciting path
for 5G evolution.
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