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Directional distributed co-ordination function – a medium access control protocol to simultaneously support both omni-directional and smart antennas in a same WLAN cell.
- Source :
-
IET Communications (Institution of Engineering & Technology) . Aug2007, Vol. 1 Issue 4, p765-771. 7p. 7 Diagrams, 1 Chart, 5 Graphs. - Publication Year :
- 2007
-
Abstract
- Directional distributed co-ordination function (D-DCF), a modified medium access control protocol of IEEE 802.11, is proposed to support hybrid antennas such as smart adaptive array antennas and normal omni-directional antennas, in one wireless local area network cell. Nodes equipped with smart antennas follow D-DCF and nodes equipped with normal antennas follow DCF. D-DCF based on a hybrid virtual carrier sense mechanism maintains compatibility with DCF. In D-DCF, before sending any data-frames, the sender and receiver node transmit a pilot sequence by means of an omni-directional request-to-send/clear-to-send handshake mechanism. Based on the pilot, the directional beam can be formed by the smart antenna. Then the node can transmit its data-frame in the directional mode. The other nodes save the transmission time between the sender and receiver in the omni-directional mode in their network allocation vectors. When the sender and receiver communicate in the directional mode, the other nodes can access the channel to send their data-frames. Hence, D-DCF supports space division multiplexing. Moreover, D-DCF fully supports time division duplex, namely both the forward and backward transmission in one access period. Simulation results show that D-DCF can support the hybrid antenna system effectively and provide much higher network throughput, lower delay, jitter and packet-loss-rate than DCF does. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17518628
- Volume :
- 1
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IET Communications (Institution of Engineering & Technology)
- Publication Type :
- Academic Journal
- Accession number :
- 26017599
- Full Text :
- https://doi.org/10.1049/iet-com:20060641