{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["006:55"], "contactPoint": {"fn": "Alison Kahn", "hasEmail": "mailto:alison.kahn@nist.gov"}, "description": "Data collected includes audio device characterization (latency/delay). End to end access time of Land Mobile Radios (LMR) including direct mode operation and trunked mode operation.", "distribution": [{"accessURL": "https://nist.force.com/pdr?@id=8C669FDFEA76120CE0532457068104992083", "description": "This page provides a registration form that must be completed before downloading the data.", "title": "Gateway for Registered Data Access"}, {"description": "Example measurement results from the Mission Critical Voice (MCV) Quality of Experience (QoE) access delay measurement system. Access delay and mouth-to-ear latency combine to describe end-to-end access time. In particular access delay describes the minimum amount of time a transmitting user must wait between pressing PTT on a device and starting to speak to ensure that the start of their message is not lost.", "downloadURL": "https://data.nist.gov/od/ds/8C669FDFEA76120CE0532457068104992083/Access_Time_Data.zip", "format": "The data is provided as wav files for the audio clips used, and results are presented as csv files.", "mediaType": "application/x-zip-compressed", "title": "Example Access Delay Measurement Data"}, {"description": "The purpose of this software is to measure the access delay of a push-to-talk network. Access time generally describes time associated with the initialization and assignment of channels upon user request to speak and has been identified as a key component of quality of experience (QoE) in communications. NIST?s PSCR division developed a method to measure and quantify the access time of any push to talk (PTT) communication system.", "downloadURL": "https://doi.org/10.18434/M32085", "format": "Git repository", "mediaType": "application/http", "title": "accessTime Repository"}, {"downloadURL": "https://data.nist.gov/od/ds/8C669FDFEA76120CE0532457068104992083/Access_Time_Data.zip.sha256", "mediaType": "text/plain", "title": "SHA256 File for Example Access Delay Measurement Data"}], "identifier": "8C669FDFEA76120CE0532457068104992083", "issued": "2019-10-07", "keyword": ["Access Delay; Access Time; Articulation Band Correlation Modified Rhyme Test (ABC-MRT); Audio; Communications; Delay; Device to Device (D2D); Direct Mode; Handset;Key Performance Indicator (KPI); Land Mobile Radio (LMR); Latency; Mission CriticalPush  To  Talk  (MCPTT);  Mission  Critical  Voice  (MCV);  Modified  Rhyme  Test  (MRT);Mouth-to-Ear (M2E); Project 25 (P25); Proximity Services (ProSe); Public Safety; PushTo Talk (PTT); Quality of Experience (QoE); Quality of Service (QoS); Repeater;  RootMean Square Error (RMSE); Sidelink; Trunked Mode."], "landingPage": "https://data.nist.gov/od/id/mds2-2083", "language": ["en"], "license": "https://www.nist.gov/open/license", "modified": "2019-06-28 00:00:00", "programCode": ["006:045"], "publisher": {"@type": "org:Organization", "name": "National Institute of Standards and Technology"}, "references": ["https://doi.org/10.6028/NIST.IR.8275"], "rights": "Purchase is not required for data downloading. Users must complete registration form to download data.", "theme": ["Advanced Communications:Wireless (RF)", "Public Safety:Public safety communications research"], "title": "MCV QoE End to End Access Time Measurement Data"}