Code-Expanded Random Access for Machine-Type Communications

Research output: Contribution to journalConference article in JournalResearchpeer-review

51 Citations (Scopus)

Abstract

Abstract—The random access methods used for support of machine-type communications (MTC) in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. Motivated by the random access method employed in LTE, we propose a
novel approach that is able to sustain a wide random access load range, while preserving the physical layer unchanged and incurring minor changes in the medium access control layer.
The proposed scheme increases the amount of available contention resources, without resorting to the increase of system resources, such as contention sub-frames and preambles. This increase is accomplished by expanding the contention space to the code domain, through the creation of random access
codewords. Specifically, in the proposed scheme, users perform random access by transmitting one or none of the available LTE orthogonal preambles in multiple random access sub-frames, thus creating access codewords that are used for contention. In this way, for the same number of random access sub-frames and orthogonal preambles, the amount of available contention
resources is drastically increased, enabling the support of an increased number of MTC users. We present the framework and analysis of the proposed code-expanded random access method and show that our approach supports load regions that are beyond the reach of current systems.
Original languageEnglish
JournalGlobecom. I E E E Conference and Exhibition
Pages (from-to)1681 - 1686
Number of pages6
ISSN1930-529X
DOIs
Publication statusPublished - 2012
EventIEEE Globecom 2012: Globecom Communications Conference - Disneyland Hotel, Anaheim, California, United States
Duration: 3 Dec 20127 Dec 2012

Conference

ConferenceIEEE Globecom 2012
LocationDisneyland Hotel
CountryUnited States
CityAnaheim, California
Period03/12/201207/12/2012

Cite this

@inproceedings{29699bbc7173432db3d4233947049f3c,
title = "Code-Expanded Random Access for Machine-Type Communications",
abstract = "Abstract—The random access methods used for support of machine-type communications (MTC) in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. Motivated by the random access method employed in LTE, we propose a novel approach that is able to sustain a wide random access load range, while preserving the physical layer unchanged and incurring minor changes in the medium access control layer. The proposed scheme increases the amount of available contention resources, without resorting to the increase of system resources, such as contention sub-frames and preambles. This increase is accomplished by expanding the contention space to the code domain, through the creation of random access codewords. Specifically, in the proposed scheme, users perform random access by transmitting one or none of the available LTE orthogonal preambles in multiple random access sub-frames, thus creating access codewords that are used for contention. In this way, for the same number of random access sub-frames and orthogonal preambles, the amount of available contention resources is drastically increased, enabling the support of an increased number of MTC users. We present the framework and analysis of the proposed code-expanded random access method and show that our approach supports load regions that are beyond the reach of current systems.",
author = "{Kiilerich Pratas}, Nuno and Henning Thomsen and Cedomir Stefanovic and Petar Popovski",
year = "2012",
doi = "10.1109/GLOCOMW.2012.6477838",
language = "English",
pages = "1681 -- 1686",
journal = "Globecom. I E E E Conference and Exhibition",
issn = "1930-529X",
publisher = "IEEE Communications Society",

}

Code-Expanded Random Access for Machine-Type Communications. / Kiilerich Pratas, Nuno; Thomsen, Henning; Stefanovic, Cedomir; Popovski, Petar.

In: Globecom. I E E E Conference and Exhibition, 2012, p. 1681 - 1686 .

Research output: Contribution to journalConference article in JournalResearchpeer-review

TY - GEN

T1 - Code-Expanded Random Access for Machine-Type Communications

AU - Kiilerich Pratas, Nuno

AU - Thomsen, Henning

AU - Stefanovic, Cedomir

AU - Popovski, Petar

PY - 2012

Y1 - 2012

N2 - Abstract—The random access methods used for support of machine-type communications (MTC) in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. Motivated by the random access method employed in LTE, we propose a novel approach that is able to sustain a wide random access load range, while preserving the physical layer unchanged and incurring minor changes in the medium access control layer. The proposed scheme increases the amount of available contention resources, without resorting to the increase of system resources, such as contention sub-frames and preambles. This increase is accomplished by expanding the contention space to the code domain, through the creation of random access codewords. Specifically, in the proposed scheme, users perform random access by transmitting one or none of the available LTE orthogonal preambles in multiple random access sub-frames, thus creating access codewords that are used for contention. In this way, for the same number of random access sub-frames and orthogonal preambles, the amount of available contention resources is drastically increased, enabling the support of an increased number of MTC users. We present the framework and analysis of the proposed code-expanded random access method and show that our approach supports load regions that are beyond the reach of current systems.

AB - Abstract—The random access methods used for support of machine-type communications (MTC) in current cellular standards are derivatives of traditional framed slotted ALOHA and therefore do not support high user loads efficiently. Motivated by the random access method employed in LTE, we propose a novel approach that is able to sustain a wide random access load range, while preserving the physical layer unchanged and incurring minor changes in the medium access control layer. The proposed scheme increases the amount of available contention resources, without resorting to the increase of system resources, such as contention sub-frames and preambles. This increase is accomplished by expanding the contention space to the code domain, through the creation of random access codewords. Specifically, in the proposed scheme, users perform random access by transmitting one or none of the available LTE orthogonal preambles in multiple random access sub-frames, thus creating access codewords that are used for contention. In this way, for the same number of random access sub-frames and orthogonal preambles, the amount of available contention resources is drastically increased, enabling the support of an increased number of MTC users. We present the framework and analysis of the proposed code-expanded random access method and show that our approach supports load regions that are beyond the reach of current systems.

UR - http://www.scopus.com/inward/record.url?scp=84875640567&partnerID=8YFLogxK

U2 - 10.1109/GLOCOMW.2012.6477838

DO - 10.1109/GLOCOMW.2012.6477838

M3 - Conference article in Journal

SP - 1681

EP - 1686

JO - Globecom. I E E E Conference and Exhibition

JF - Globecom. I E E E Conference and Exhibition

SN - 1930-529X

ER -