Open AccessSingle‐radio multi‐subchannel random access for OFDMA wireless networks
Author(s) -
Xu Jia,
Lv Pin,
Wang Xudong
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.1905
Subject(s) - carrier sense multiple access with collision avoidance , computer network , computer science , random access , frequency division multiple access , subcarrier , channel access method , orthogonal frequency division multiple access , wireless network , orthogonal frequency division multiplexing , wireless , network packet , cognitive radio , distributed coordination function , channel (broadcasting) , throughput , ieee 802.11 , telecommunications
Orthogonal frequency division multiple access (OFDMA) is a promising technology owing to its flexibility in subcarrier/subchannel allocation. Since most applications in OFDMA wireless networks generate bursty traffic, it is efficient and flexible to employ a random access mechanism in such networks. A single‐radio multi‐subchannel carrier sense multiple access with collision avoidance (CSMA/CA)‐based random access protocol (called SRMC‐CSMA/CA) is proposed for OFDMA wireless networks. By means of intermittent carrier sense and cumulative update of backoff counters, a terminal with a single radio can utilise multiple subchannels to transmit packets concurrently. Simulation results indicate that the SRMC‐CSMA/CA protocol apparently improves the channel utilisation, especially when the traffic loads of the terminals are unbalanced.