Latency (engineering)

About: Latency (engineering) is a research topic. Over the lifetime, 3729 publications have been published within this topic receiving 39210 citations. The topic is also known as: lag.

Location based placement of whole distributed systems

Abstract: The high bandwidth and low latency of the modern internet has made possible the deployment of distributed computing platforms. The XenoServe platform provides a distributed computing platform open to all and presents three major new challenges for resource discovery: Firstly, network location is key for effectively provisioning services, to mitigate against high-latency, high-load or component failure. Secondly, many services require a presence on several servers, with inter-related requirements. Finally, as the platform is open with respect to users and servers, large numbers of queries and updates are expected.To address these requirements we introduce and evaluate XenoSearch, a new distributed service for selecting the machines to host components of multi-node distributed systems and which is uniquely able to express and efficiently answer complex queries with inter-related location constraints. We demonstrate that XenoSearch represents a trade-off between accuracy and query time which avoids exhaustive search and supports multiple resources. In addition the performance of the algorithm and the quality of its server selections is investigated and the performance of the distributed service shown to be invariant as the number of nodes or items indexed increases.

A Proxy Server-Network for Real-time Computer Games ?

Abstract: Computer games played over the Internet have recently become an important class of distributed applications. In this paper we present a novel proxy server-network topology aiming at improved scalability of multiplayer games and low latency in client-server data transmission. We present a mechanism to efficiently synchronize the distributed state of a game based on the concept of eventual consistency. We analyse the benefits of our approach compared to commonly used client-server and peer-to-peer topologies, and present first experimental results.

APS: Adaptive Packet Spraying to Isolate Mix-flows in Data Center Network

Abstract: Modern data centers host diverse applications, which generate a mix of short flows with stringent latency requirement and long flows requiring large sustained throughput. To solve the problem of resource competition between the mixed flows, we propose an adaptive traffic isolation scheme APS. Based on the packet spraying scheme in the multipath transmission, APS dynamically separates long flows from short ones on different paths to provide the low latency for the short flows. Meanwhile, to resolve the out-of-order problem, APS limits the long flows to a few paths with Equal Cost Multi Path (ECMP). Experimental results of NS2 simulation and Mininet implementation show that, APS reduces the average completion time for short flows by up to 60% and increases the throughputs for long flows by about 1.68x over the state-of-the-art multipath transmission schemes.

Unified Device-to-Device Communications for Low-Latency and High Reliable Vehicle-to-X Services

Abstract: We propose a novel unified radio frame structure and medium access control (MAC) protocol for low-latency and highly reliable vehicle-to-X (V2X) communications. The radio frame structure enables short latency transmission and the unified device-to- device (D2D) communication for V2X services. The unified MAC protocol simultaneously enables the cellular-assisted and ad-hoc D2D communications to enable reliable V2X services in full / partial / out- of-cellular-coverage scenario. The initial system- level simulations show promising performance results in benchmarking scenarios: Unified D2D MAC can achieve radio transmission latency below 5 ms at high reliability of 90% packet reception ratio and with high availability of coverage radius of up to 200 meter. Our on-going work is expected to provide further evaluation results of the unified D2D MAC in heterogeneous V2X scenarios.

Energy Efficiency Analysis of Heterogeneous Cache-Enabled 5G Hyper Cellular Networks

Abstract: The emerging 5G wireless networks will pose extreme requirements such as high throughput and low latency. Caching as a promising technology can effectively decrease latency and provide customized services based on group users behaviour (GUB). In this paper, we carry out the energy efficiency analysis in the cache-enabled hyper cellular networks (HCNs), where the macro cells and small cells (SCs) are deployed heterogeneously with the control and user plane (C/U) split. Benefiting from the assistance of macro cells, a novel access scheme is proposed according to both user interest and fairness of service, where the SCs can turn into semi- sleep mode. Expressions of coverage probability, throughput and energy efficiency (EE) are derived analytically as the functions of key parameters, including the cache ability, search radius and backhaul limitation. Numerical results show that the proposed scheme in HCNs can increase the network coverage probability by more than 200% compared with the single- tier networks. The network EE can be improved by 54% than the nearest access scheme, with larger research radius and higher SC cache capacity under lower traffic load. Our performance study provides insights into the efficient use of cache in the 5G software defined networking (SDN).