Page 213 - Kaleidoscope Academic Conference Proceedings 2021

Session 1: Enabling future wireless communication systems
1
S1.1 Proposal for a user-centric RAN architecture towards beyond 5G
Kosuke Yamazaki, Takeo Ohseki, Yoshiaki Amano, Hiroyuki Shinbo, Takahide Murakami and

Yoji Kishi (KDDI Research, Inc., Japan)

In this paper, we propose a "user-centric Radio Access Network (RAN) architecture" towards
Beyond 5G. In a Beyond 5G mobile networks, connectivity to the network with sufficient quality
should always be provided to users who demand that various quality requirements be met
anytime and anywhere in the physical space. To achieve this, it is necessary to eliminate the
degradation of radio quality at the cell edge, which requires the installation and cooperation of a
much larger number of base stations in higher density. Furthermore, to overcome the imbalance
in communication quality between the uplink and downlink still found in 5G, it is also necessary
to eliminate the limitation of user terminals by virtually increasing the number of antennas and
expanding transmission power for the number of antennas of user terminals and the power
consumption of user terminals. On the other hand, a new RAN management is expected to
provide users with their respective radio access capability through flexible cooperation of the
base station around them. In this paper, we describe in detail the specific technical issues and our
approach to realize the user-centric RAN architecture.

S1.2 Towards a robust new radio compatible with XR*
Yuzhou Hu, Jiajun Xu, Xiaoying Ma, Mengzhu Chen, Hong Tang and Jun Xu (State Key
Laboratory of Mobile Network and Mobile Multimedia Technology, ZTE Corporation, China)

Extended Reality (XR), an umbrella abbreviation for Cloud Gaming/Augmented Reality/Virtual
Reality, is supposed to deliver the commercial outlook for 5G networks. This paper discusses the
challenges incurred by this service due to its inherent stringent requirements from a data rate,
reliability and latency perspective. To address the challenges, a novel priority-based adaptive
preemption/cancellation strategy is proposed to guarantee the new radio quality of service under
both the multi-streams XR service and XR in concurrent transmission with other services
scenarios. Simulation results demonstrate that a scheduler devised based on the principle of the
proposed strategy is quite useful from a capacity perspective. In the meantime, a synthesis of the
industrial consideration and vision is provided featuring the ongoing the 3rd Group Partnership
Project Release-17 XR study item

S1.3 A design of NB-IoT random access preamble receiver for large frequency offset
Chenchen Zhang (State Key Laboratory of Mobile Network and Mobile Multimedia Technology,
ZTE Corporation, China); Nan Zhang, Wei Cao and Kaibo Tian (ZTE Corporation, China);

Zhen Yang (State Key Laboratory of Mobile Network and Mobile Multimedia Technology, ZTE
Corporation, China)

In the fifth generation (5G) and beyond, the satellite communication system is expected to
support Narrowband Internet of Things (NB-IoT). However, the residual frequency offset in a
channel may be large because of the large velocity of the satellites. In a legacy narrowband
internet of things system, the users are assumed to have low velocity, and the random access
preamble consists of single-subcarrier orthogonal frequency-division multiplexing symbols.
With a large frequency offset, the power of the preamble leaks into adjacent subcarriers, which
will cause severe performance degradation. In this paper, the influence of the leaked power is
theoretically investigated, based on which a novel random access receiver is proposed to alleviate
the performance degradation. The adjacent subcarriers are actually coherently combined to take
advantages of the leaked power. The weights in combination are designed to suppress the
interference of other users when the frequency offset is large. Numerical results show that the
proposed receiver has good performance in preamble detection.

1 Papers marked with an “*” were nominated for the three best paper awards.
– 151 –