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REA-MAC:A low latency routing-enhanced asynchronous duty-cycle MAC protocol for wireless sensor networks

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Journal of Central South University 2013年第3期20卷 678-687页

作者：唐宏伟曹建农孙彩霞卢凯 College of Computer Science National University of Defense Technology Department of Computing Hong Kong Polytechnic University

Many energy efficiency asynchronous duty-cycle MAC(media access control) protocols have been proposed in recent ***,in these protocols,wireless sensor nodes almost choose their wakeup time randomly during the operational cycle,which results in the packet delivery latency increased significantly on the multiple hops *** reduce the packet delivery latency on multi-hop path and energy waste of the sender's idle listening,a new low latency routing-enhanced asynchronous duty-cycle MAC protocol was presented,called *** REA-MAC,each sensor node decided when it waked up to send the beacon based on cross-layer routing ***,the sender adaptively waked up based on the relationship between the transmission request time and the wakeup time of its next hop *** simulation results show that REA-MAC reduces delivery latency by 60% compared to RI-MAC and reduces 8.77% power consumption on *** heavy traffic,REA-MAC's throughput is 1.48 times of RI-MAC's.

关键词： wireless sensor networks asynchronous duty-cycle media access control protocol idle listening low latency

Mobile Edge Computing and Field Trial Results for 5G low latency Scenario

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China Communications 2016年第S2期13卷 174-182页

作者： Jianmin Zhang Weiliang Xie Fengyi Yang Qi Bi China Telecom Co. Ltd.Technology Innovation Center China Telecom Beijing Information Sci.&Tech

Through enabling the IT and cloud computation capacities at Radio Access Network(RAN),Mobile Edge Computing(MEC) makes it possible to deploy and provide services ***,MEC becomes the potential technology to satisfy the requirements of 5G network to a certain extent,due to its functions of services localization,local breakout,caching,computation offloading,network context information exposure,***,MEC can decrease the end-to-end latency dramatically through service localization and caching,which is key requirement of 5G low latency ***,the performance of MEC still needs to be evaluated and verified for future ***,the concept of MEC is introduced into5 G architecture and analyzed for different 5G scenarios in this ***,the evaluation of MEC performance is conducted and analyzed in detail,especially for network end-to-end *** addition,some challenges of the MEC are also discussed for future deployment.

关键词： mobile edge computing(MEC) 5G network architecture low latency

Higher Speed Passive Optical Networks for low latency Services

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ZTE Communications 2021年第2期19卷 61-66页

作者： ZHANG Weiliang YUAN Liquan Wireline Product Planning Department ZTE CorporationShanghai 201203China

latency sensitive services have attracted much attention lately and imposedstringent requirements on the access network design. Passive optical networks (PONs) providea potential long-term solution for the underlying transport network supporting theseservices. This paper discusses latency limitations in PON and recent progress in PONstandardization to improve latency. Experimental results of a low latency PON system arepresented as a proof of concept.

关键词： passive optical networks time-division multiple access wavelength-division multiple access low latency

A low-latency list decoder for polar codes

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Science China(Information Sciences) 2018年第10期61卷 163-172页

作者： Qingyun XU Zhiwen PAN Nan LIU Xiaohu YOU National Mobile Communications Research Laboratory Southeast University

Successive cancellation(SC) is a low complexity serial decoding algorithm for polar codes, and successive cancellation list(SCL) can achieve excellent error-correcting performance. However, SCL decoder suffers from long decoding latency compared with belief propagation(BP) decoder. In this paper, a lowlatency list decoder whose latency performance can approach that of BP deocder is proposed. A prunable subtree recognizing scheme based on H-Matrix check is proposed by taking the reliability of frozen bits into account. Then, a latency-reduced list decoder based on the prunable constituent codes is *** results show that the decoding latency of proposed list scheme can be reduced significantly,especially for high signal noise ratio(SNR) region.

关键词： list decoder low latency polar codes successive cancellation

Deep reinforcement learning based computation offloading and resource allocation for low-latency fog radio access networks

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Intelligent and Converged Networks 2020年第3期1卷 243-257页

作者： G.M.Shafiqur Rahman Tian Dang Manzoor Ahmed Key Laboratory of Universal Wireless Communications(Ministry of Education) Beijing University of Posts and TelecommunicationsBeijing 100876China

Fog Radio Access Networks(F-RANs)have been considered a groundbreaking technique to support the services of Internet of Things by leveraging edge caching and edge ***,the current contributions in computation offloading and resource allocation are inefficient;moreover,they merely consider the static communication mode,and the increasing demand for low latency services and high throughput poses tremendous challenges in F-RANs.A joint problem of mode selection,resource allocation,and power allocation is formulated to minimize latency under various *** propose a Deep Reinforcement Learning(DRL)based joint computation offloading and resource allocation scheme that achieves a suboptimal solution in *** core idea of the proposal is that the DRL controller intelligently decides whether to process the generated computation task locally at the device level or offload the task to a fog access point or cloud server and allocates an optimal amount of computation and power resources on the basis of the serving *** results show that the proposed approach significantly minimizes latency and increases throughput in the system.

关键词： fog radio access networks computation offloading mode selection resource allocation distributed computation low latency deep reinforcement learning

Recent Trends of In-Vehicle Time Sensitive Networking Technologies, Applications and Challenges

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中国通信:英文版 2023年第11期20卷 30-55页

作者： Yanli Xu Jian Shang Hao Tang School of Information Engineering Shanghai Maritime UniversityShanghai 201306China

With the vigorous development of automobile industry,in-vehicle network is also constantly upgraded to meet data transmission requirements of emerging *** main transmission requirements are low latency and certainty especially for autonomous *** sensitive networking(TSN)based on Ethernet gives a possible solution to these *** surveys usually investigated TSN from a general perspective,which referred to TSN of various application *** this paper,we focus on the application of TSN to the in-vehicle *** in-vehicle networks,we discuss all related TSN standards specified by IEEE 802.1 work group up to *** further overview and analyze recent literature on various aspects of TSN for automotive applications,including synchronization,resource reservation,scheduling,certainty,software and *** scenarios of TSN for in-vehicle networks are analyzed one by *** TSN of in-vehicle network is still at a very initial stage,this paper also gives insights on open issues,future research directions and possible solutions.

关键词： automobile industry deterministic transmission in-vehicle network low latency time sensitive networking(TSN)

Beam Position and Beam Hopping Design for LEO Satellite Communications

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China Communications 2023年第7期20卷 29-42页

作者： Leyi Lyu Chenhao Qi School of Information Science and Engineering Southeast UniversityNanjing 210096China

The numbers of beam positions(BPs)and time slots for beam hopping(BH)dominate the latency of LEO satellite *** at minimizing the number of BPs subject to a predefined requirement on the radius of BP,a low-complexity user density-based BP design scheme is proposed,where the original problem is decomposed into two subproblems,with the first one to find the sparsest user and the second one to determine the corresponding best *** particular,for the second subproblem,a user selection and smallest BP radius algorithm is proposed,where the nearby users are sequentially selected until the constraint of the given BP radius is no longer *** two subproblems are iteratively solved until all the users are *** further reduce the BP radius,a duplicated user removal algorithm is proposed to decrease the number of the users covered by two or more *** at minimizing the number of time slots subject to the no co-channel interference(CCI)constraint and the traffic demand constraint,a low-complexity CCI-free BH design scheme is proposed,where the BPs having difficulty in satisfying the constraints are considered to be illuminated in *** results verify the effectiveness of the proposed schemes.

关键词： beam hopping(BH)design beam position(BP)design low earth orbit(LEO) low latency satellite communications

Designs of low insertion loss optical router and reliable routing for 3D optical network-on-chip

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Science China(Information Sciences) 2016年第10期59卷 33-49页

作者： Pengxing GUO Weigang HOU Lei GUO School of Computer Science and Engineering Northeastern University

Three-Dimensional Optical Network-on-Chip(3D ONoC) has recently emerged as a high-performance on-chip communication solution; however, owing to the intrinsic characteristics of photonic devices in existing 3D ONoC, the insertion loss caused by undesirable coupling among optical signals degrades network performance. Considering manufacturing defects and unpredictable noise sources that cause the failure of Optical Routers(ORs) in 3D ONoC, previous work simply abandoned the disabled OR when computing the restore *** this paper, we propose a new OR structure that reduces insertion loss, and we present the design of a novel adaptive routing algorithm, FTRA-BL, based on the new OR structure with bidirectional waveguides, without abandoning any disabled ORs. Our FTRA-BL selects the normal waveguide in the disabled OR as the backup link so that the best macroscopic restore path can be guaranteed. Simulation results show that our method performs better than previous work in improving transmission reliability and latency.

关键词： 3D ONoC low insertion loss reliable routing bidirectional waveguide low latency

T-IP: A Self-Trustworthy and Secure Internet Protocol

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China Communications 2018年第2期15卷 1-14页

作者： Xiaofeng Wang Huan Zhou Jinshu Su Baosheng Wang Qianqian Xing Pengkun Li School of Computer National University of Defense Technology

IPsec has become an important supplement of IP to provide security protection. However, the heavyweight IPsec has a high transmission overhead and latency, and it cannot provide the address accountability. We propose the self-trustworthy and secure Internet protocol(T-IP) for authenticated and encrypted network layer communications. T-IP has the following advantages:(1) Self-Trustworthy IP address.(2) low connection latency and transmission overhead.(3) Reserving the important merit of IP to be stateless.(4) Compatible with the existing TCP/IP architecture. We theoretically prove the security of our shared secret key in T-IP and the resistance to the known session key attack of our security-enhanced shared secret key calculation. Moreover, we analyse the possibility of the application of T-IP, including its resilience against the man-in-the-middle attack and Do S attack. The evaluation shows that T-IP has a much lower transmission overhead and connection latency compared with IPsec.

关键词： identity-based cryptography self-trustworthy lightweight low latency in-cremental deployment