Ya-Qin Zhang

Tsinghua University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Wenwu Zhu

Tsinghua University

Qian Zhang

Huazhong University of Science and Technology

Shipeng Li

University of Nottingham Ningbo China

Xiaoyan Sun

Worcester Polytechnic Institute

Feng Wu

Nanjing University of Science and Technology

Jiangchuan Liu

Simon Fraser University

Xiang‐Gen Xia

University of Delaware

Dapeng Wu

City University of Hong Kong

Tihao Chiang

National Yang Ming Chiao Tung University

Huai-Rong Shao

Samsung (United States)

Cooperative Institutions

Chinese Academy of Sciences

Microsoft Research Asia (China)

Hong Kong University of Science and Technology

University of Hong Kong

Microsoft (United States)

Tsinghua University

East China Jiaotong University

University of Chinese Academy of Sciences

National Institutes of Health

National Center for Advancing Translational Sciences

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

6G Network Business Support System

arXiv (Cornell University) (2023)

Ye Ouyang Ya-Qin Zhang Peng Wang Yunxin Liu Qiao Wen

6G is the next-generation intelligent and integrated digital information infrastructure, characterized by ubiquitous interconnection, native intelligence, multi-dimensional perception, global coverage, green and low-carbon, native network security, etc. 6G will realize the transition from serving people and people-things communication to supporting the efficient connection of intelligent agents, and comprehensively leading the digital, intelligent and green transformation of the economy and the society. As the core support system for mobile communication network, 6 6G BSS need to integrate with new business models brought about by the development of the next-generation Internet and IT, upgrade from "network-centric" to "business and service centric" and "customer-centric". 6G OSS and BSS systems need to strengthen their integration to improve the operational efficiency and benefits of customers by connecting the digital intelligence support capabilities on both sides of supply and demand. This paper provides a detailed introduction to the overall vision, potential key technologies, and functional architecture of 6G BSS systems. It also presents an evolutionary roadmap and technological prospects for the BSS systems from 5G to 6G.

Upgrade

10.48550/arxiv.2307.10004

Cite

Citations (0)

Media streaming over mobile networks

Ya-Qin Zhang

Summary form only given. Robust multimedia transmission over wireless channels is a challenging problem due to the high bit error rate (BER) and its impact on compressed media quality. We propose an adaptive quality-of-service control scheme to achieve end-to-end image and video quality improvement with the following two new components: (1) an optimal mode decision algorithm that provides the best tradeoff between compression efficiency and error-resilience in rate-distortion (R-D) sense, which works in the compression layer; and (2) delay-constrained hybrid ARQ capable of reducing the residual BER for the compression layer while guaranteeing delay bound and achieving high throughput. Simulation results for MPEG4 video are demonstrated to show the effectiveness of the new scheme. We believe the proposed approach provide a promising technology for streaming rich media contents over emerging mobile networks such as 3G wireless framework.

Forward error correction

10.1109/icosp.2000.894436

Cite

Citations (0)

Overview of Virtual Private Network

Zhensheng Zhang Xiaowen Chu Bo Li Ya-Qin Zhang

Private network

Source

Cite

Citations (0)

MPEG4 compressed video over the Internet

Dapeng Wu Yonghong Hou Wenwu Zhu Ya-Qin Zhang H. Jonathan Chao

This paper focuses on transport issues of MPEG-4 video over the Internet. Specifically, we present a packetization algorithm for MPEG-4 bit streams at the sync layer and an end-to-end feedback control mechanism. Our packetization algorithm achieves both efficiency and robustness by exploiting the unique video object plane (VOP) feature in MPEG-4 while our feedback control algorithm is capable of estimating available network bandwidth based on the packet loss information at the receiver. Simulation results demonstrate that once our algorithms are employed by an adaptive MPEG-4 encoder, MPEG-4 video is able to achieve good perceptual picture quality at the receiver under low bit rate and varying network conditions and efficiently utilize network resources.

sync

Robustness

10.1109/iscas.1999.780008

Cite

Citations (12)

How to Cultivate the Innovation Ability of Students in Middle School Computer Teaching

Computer Knowledge and Technology (2014)

Ya-Qin Zhang

Mode (computer interface)

Source

Cite

Citations (0)

Throughput and QoS Optimization in IEEE 802.11 WLAN

Jun Zhao Qian Zhang Wenwu Zhu Ya-Qin Zhang

Source

Cite

Citations (11)

Lateral error recovery for application-level multicast

K.-F.S. Wong S.-H. Gary Chan Wan-Ching Wong Qian Zhang Wenwu Zhu

We consider the delivery of reliable and streaming services using application-level multicast (ALM) by means of UDP, where packet loss has to be recovered via retransmission in a timely manner in order to offer high level of service. Since packets may be lost due to congestion, tree-reconfiguration or node failure, the traditional "vertical" recovery, whereby upstream nodes retransmit the lost packet is no longer effective. We therefore propose and investigate lateral error recovery (LER). In LER, hosts are divided into a number of planes, each of which forms an independent ALM tree. Since the correlation of error among the planes is likely to be low, a node can effectively recover its error "laterally" from nearby nodes in other planes. We employ the technique of global network positioning (GNP) to map the hosts into a coordinate space and identify a set of close neighbors for error recovery by constructing a Voronoi diagram for each plane. We present centralized and distributed algorithm on how to construct the Voronoi diagrams. Using Internet-like topologies, we show via simulations that our system achieves low overheads in terms of relative delay penalty and physical link stress. For reliable service, lateral recovery greatly reduces the average recovery time as compared with vertical recovery schemes. For streaming applications, LER achieves much lower residual loss rate under a certain deadline constraint.

Retransmission

Tree (set theory)

10.1109/infcom.2004.1354689

Cite

Citations (21)

Optimal joint source-channel bit allocation for MPEG-4 fine granularity scalable video over OFDM system

Jizheng Xu Qian Zhang Wenwu Zhu Xiang‐Gen Xia Ya-Qin Zhang

In this paper, we propose an optimal bit allocation method for MPEG-4 fine granularity scalable (FGS) video over OFDM transmission. In the proposed method, we consider the joint optimal bit allocation of source and forward error correction (Reed-Solomon) codes of different rates over OFDM. Our simulation results show that our proposed approach achieves significant PSNR gain over the existing approach without channel error protection when the input and the output data rates are fixed.

Granularity

MPEG-4

Bit (key)

10.1109/iscas.2003.1205982

Cite

Citations (10)

Transporting real-time video over the Internet: challenges and approaches

Proceedings of the IEEE (2000)

Dapeng Wu Yiwei Hou Ya-Qin Zhang

Delivering real-time video over the Internet is an important component of many Internet multimedia applications. Transmission of real-time video has bandwidth, delay, and loss requirements. However the current Internet does not offer any quality of service (QoS) guarantees to video transmission over the Internet. In addition, the heterogeneity of the networks and end systems makes it difficult to multicast Internet video in an efficient and flexible way. Thus, designing protocols and mechanisms for Internet video transmission poses many challenges. In this paper, we take a holistic approach to these challenges and present solutions from both transport and compression perspectives. With the holistic approach, we design a framework for transporting real-time Internet video, which includes two components, namely, congestion control and error control. Specifically congestion control consists of rate control, rate-adaptive encoding, and rate shaping; error control consists of forward error correction (FEC), retransmission error resilience, and error concealment. For the design of each component in the framework, we classify approaches and summarize representative research work. We point out there exists a design space which can be explored by video application designers and suggest that the synergy of both transport and compression could provide good solutions.

Retransmission

Packet loss

Component (thermodynamics)

Internet video

Forward error correction

10.1109/5.899055

Cite

Citations (310)

End-to-end modeling and simulation of MPEG-2 transport streams over ATM networks with jitter

IEEE Transactions on Circuits and Systems for Video Technology (1998)

Wenwu Zhu Y. Thomas Hou Yao Wang Ya-Qin Zhang

The operation of MPEG-2 systems is modeled and simulated when an MPEG-2 transport stream is delivered through an ATM network with jitter. End-to-end packet-based analysis is performed for delivery of MPEG-2 transport streams over ATM networks. A novel approach to analyzing the decoder buffer behaviour in the presence of network jitter is presented. The probability density function of the interarrival time of the ATM adaptation layer 5 (AAL5) protocol data unit (PDU) is derived from an MPEG-2 video source model and an ATM network jitter model. Based on a real-time decoding requirement of the MPEG-2 transport stream (TS) system target decoder (T-STD), the decoder buffer behaviour is simulated. In this simulation, the packets' arrivals follow the derived probability density function of the AAL5 PDU interarrival time. The modeling and simulation results show the interactions among packet loss ratio, decoder buffer size, and network jitter level. We found that jitter affects decoder buffer size and packet loss ratio in a significant way.

Packet loss

Packet Switching

Distributed coordination function

10.1109/76.660823

Cite

Citations (15)