access icon free Single-radio multi-subchannel random access for OFDMA wireless networks

© The Institution of Engineering and Technology
Received 10/06/2013, Published

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.

Inspec keywords: radio access networks; telecommunication traffic; frequency division multiple access; OFDM modulation

Other keywords: OFDMA wireless networks; orthogonal frequency division multiple access; single-radio multisubchannel random access; random access mechanism; intermittent carrier sense; subcarrier/subchannel allocation; channel utilisation; bursty traffic; collision avoidance based random access protocol

Subjects: Modulation and coding methods; Multiple access communication; Radio access systems

References

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