Title :
Performances of IEEE 802.15.4 unslotted CSMA-CA for voice communications
Author :
Song, Hae Yeon ; Cho, Sung Ho
Author_Institution :
Dept. of Electron. & Comput. Eng., Hanyang Univ., Seoul, South Korea
Abstract :
The 2.4 GHz band of the IEEE 802.15.4 specifies low rate transmission of 250 kbps. Because of the low bandwidth, it is not easy to implement Voice over Sensor Networks (VoSN) even peer to peer voice communication. In this paper, we implement VoSN using non beacon-enabled mode to achieve high utilization of bandwidth. As a result, peer to peer full-duplex voice communication in the long distance and four users to four users (4-to-4) full-duplex voice communication in star topology show very low packet loss rate. With these results, we explain the cause of packet loss by analyzing received and transmitted voice packets between voice nodes and a coordinator.
Keywords :
Zigbee; carrier sense multiple access; telecommunication congestion control; telecommunication network topology; voice communication; IEEE 802.15.4 unslotted CSMA-CA; VoSN; bandwidth utilization; bit rate 250 kbit/s; frequency 2.4 GHz; nonbeacon-enabled mode; packet loss rate; peer full-duplex voice communication; star topology; voice node; voice over sensor network; voice packet transmission; Bandwidth; Codecs; Delay; IEEE 802.15 Standards; Peer to peer computing; Topology; Wireless communication; Bandwidth capacity; CSMA/CA; IEEE 802.15.4; Voice communication; Voice over Sensor Networks (VoSN);
Conference_Titel :
Communications (APCC), 2011 17th Asia-Pacific Conference on
Conference_Location :
Sabah
Print_ISBN :
978-1-4577-0389-8
DOI :
10.1109/APCC.2011.6152795
