Presentation Information
[B-5A-01]Early Commercialization and System Evolution for HAPS Direct-to-Mobile-Phone Service
- Design and Software Integration of Beam Control for a Regenerative Payload with Environmental Considerations -
◎Yuki Hokazono1, Daisuke Kurita1, Atsunori Shimamura1, Yuki Itabashi1, Hirofumi Nakajo1, Toshihiko Suzuki1, Kenji Fukasawa1, Yuto Muroki2, Takuya Miyashita2, Yoshihisa Kishiyama2 (1. NTT DOCOMO, INC., 2. Space Compass Corporation)
Keywords:
HAPS,Beyond 5G,6G,NTN,TDD
In the advancement of direct communications for handheld devices using high-altitude platform stations (HAPS), not only wide-area coverage but also enhancement of spectral efficiency and flexible radio resource control are essential. To address these requirements, regenerative payloads capable of onboard processing of gNodeB (gNB) functions are needed. However, stringent size, weight, and power (SWaP) constraints necessitate the development of low-complexity beam management schemes compliant with 5G New Radio (NR). In prior work, we proposed a user-specific beamforming scheme utilizing both synchronization signal blocks (SSB) and channel state information reference signals (CSI-RS), along with an implementation method that integrates platform information, referred to as HAPS beamformer by MIX of SSB/CSI-RS beams and platform information (HAPMIX). In this paper, to realize these techniques at the implementation level, we present a service-link payload architecture applying HAPMIX, a software integration framework for beam control, and design requirements to ensure robustness against stratospheric environmental conditions.