Page 71 - Kaleidoscope Academic Conference Proceedings 2021

TOWARDS A ROBUST NEW RADIO COMPATIBLE WITH XR

Yuzhou Hu 1,2 ; Jiajun Xu 1,2 ; Xiaoying Ma 1,2 ; Mengzhu Chen 1,2 ; Hong Tang 1,2 ; Jun Xu 1,2
1
ZTE Corperation, China
2
State Key Laboratory of Mobile Network and Mobile Multimedia Technology, China

ABSTRACT To that end, the 3rd Generation Partnership Project
(3GPP) Release-17 is discussing evaluations on XR
Extended Reality (XR), an umbrella abbreviation for with a study item involving both System Aspects (SA)
Cloud Gaming/Augmented Reality/Virtual Reality, is and a Radio Access Network (RAN) 3GPP technical
supposed to deliver the commercial outlook for 5G specification group including aspects of a traffic model
networks. This paper discusses the challenges incurred and simulation methodology. From a traffic perspective,
by this service due to its inherent stringent requirements application data unit-based video streaming, multiple
from a data rate, reliability and latency perspective. stream and a packet arrival jittering effect is distinctive
To address the challenges, a novel priority-based of XR and set up as evaluation assumptions. From
adaptive preemption/cancellation strategy is proposed to a simulation methodology perspective, capacity and
guarantee the new radio quality of service under both power perspectives have been pursued so far taking the
the multi-streams XR service and XR in concurrent number of user equipment (UE) within which a 90%
transmission with other services scenarios. Simulation satisfaction rate is fulfilled as a capacity metric and the
results demonstrate that a scheduler devised based on the power saving benefit compared with an always-on UE
principle of the proposed strategy is quite useful from state as the power metric. Moreover, the assessment of
a capacity perspective. In the meantime, a synthesis any power saving scheme should be taken jointly with
of the industrial consideration and vision is provided its degradation on capacity as well. The challenges and
featuring the ongoing the 3rd Group Partnership Project answering enhancement to the two Key Performance
Release-17 XR study item. Indicators (KPIs) capacity and power are drawing major
industrial focus and are vital to ensuring the quality
Keywords - Extended reality, industrial consideration of experience of this service. Taking the progress
and vision, priority-based adaptive preemptive made as starting point, 3GPP is envisioned to identify,
scheduler, quality of service. through extensive evaluation results, the challenges
of XR services to the current NR air interface. In
the ongoing 3GPP Release-18 workshop discussion [6,
1. INTRODUCTION
7, 8], cross-layer examination of the current NR air
interface is elaborated wherein detailed working areas
Extended Reality (XR) services have been used
for enhancement have been proposed towards better
to generate a new business paradigm in areas
delivery of these two KPIs.
including work flow assistance, professional formation,
telemedicine services, advanced automated services and In this paper, Release-17 discussion on a single stream
are also widely expected to take up the role of a and multiple streams XR traffic model is introduced
killer application to truly and substantially incentivize first. Due to the traffic arrival jitter and the overlarge
new radio air interfaces[1]-[5]. The market margin for radio resource occupation of XR packets, collision
this service is expected to exceed US$180 million by exists under circumstances of both between different
the end of 2021 [1]. A new radio air interface shall XR data streams or XR with a concurrent stream.
convey 6 degrees of freedom data bulks, 8-12k high Quality of experience degradation for the packets with
definition video and incorporate new user equipment stringent requirement will lead to network congestion
endpoints such as a head-mounted display device or and degradation of the system capacity. To address
augmented reality glass. Split rendering together with this, a priority-based adaptive preemptive scheduler is
multi-access edge computation provides architectural proposed. According to our simulation results, the
support for the offload of computation/transmission proposed scheduler is capable of increasing the system
burden incurred by XR services. In addition to that, capacity compared to the traditional scheduler.
thorough evaluation based on closely examined XR The subsections are organized as follows: Section 2
traffic characteristics should be done to determine provides detailed analysis of XR-specific traffic featuring
whether or how to introduce any further enhancement to video streaming. Section 3 elaborates the challenges
New Radio (NR) so that the capital expenditure of NR with this service, in particular under concurrent
deployment can be actually leveraged by XR services.

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