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Paper Abstract and Keywords
Presentation 2026-09-03 10:10
N/A
Hanchen Feng (UOsaka), Takumasa Ishioka (KTU), Shunsuke Saruwatari, Takuya Fujihashi (UOsaka) NS2026-68
Abstract (in Japanese) (See Japanese page) 
(in English) Speculative video transmission in cloud gaming hides input-to-display latency by generating and transmitting video frames for possible future inputs in advance. However, game inputs often remain unchanged over many consecutive frames and then change abruptly when players change direction or press or release buttons. In such sequences, overall prediction accuracy is dominated by performance on frames with unchanged inputs, while a single prediction candidate may fail to capture the actual input following a transition. If that input is absent from the speculative candidates, the video frames generated and transmitted in advance cannot be used, and the system can no longer hide the latency.
We propose a method for generating top-(K) speculative input candidates by estimating the probability of each input bit in the next frame from past input history. In addition to the most likely input, the method enumerates alternative inputs in ascending order of the sum of the costs associated with flipping bits relative to the most likely input. By including post-transition inputs that a single prediction may miss in a limited set of speculative candidates, the proposed method aims to accommodate abrupt changes during sustained input while limiting network traffic.
Using approximately 27.05 hours of input logs collected from 16 sessions across 10 games, we evaluated the effective frame rate over all frames and prediction accuracy at input transitions. With 10 speculative candidates, the proposed method achieved effective frame rates of 57.9 fps in the same-player setting and 55.8 fps in the different-player setting, outperforming the comparison methods in both settings.
Keyword (in Japanese) (See Japanese page) 
(in English) Cloud gaming / Speculative video transmission / Speculative candidate selection / / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 164, NS2026-68, pp. 12-18, Sept. 2026.
Paper # NS2026-68 
Date of Issue 2026-08-27 (NS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NS2026-68

Conference Information
Committee NS IN CS NV  
Conference Date 2026-09-03 - 2026-09-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Session management (SIP/IMS), Interoperability/Standardization, NGN/NwGN/Future networks, Cloud/Data center networks, SDN (OpenFlow, etc.)/NFV, IPv6, Machine learning, etc. 
Paper Information
Registration To NS 
Conference Code 2026-09-NS-IN-CS-NV 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) N/A 
Sub Title (in English)  
Keyword(1) Cloud gaming  
Keyword(2) Speculative video transmission  
Keyword(3) Speculative candidate selection  
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1st Author's Name Hanchen Feng  
1st Author's Affiliation The University of Osaka (UOsaka)
2nd Author's Name Takumasa Ishioka  
2nd Author's Affiliation Kyoto Tachibana University (KTU)
3rd Author's Name Shunsuke Saruwatari  
3rd Author's Affiliation The University of Osaka (UOsaka)
4th Author's Name Takuya Fujihashi  
4th Author's Affiliation The University of Osaka (UOsaka)
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Speaker Author-1 
Date Time 2026-09-03 10:10:00 
Presentation Time 25 minutes 
Registration for NS 
Paper # NS2026-68 
Volume (vol) vol.126 
Number (no) no.164 
Page pp.12-18 
#Pages 7 
Date of Issue 2026-08-27 (NS) 

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