802.15.4

802.15.4 - AreaNetworksIEEE 802.15.4 1 WPANs :...

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  cps750 Wireless Networking 1 Low Rate Wireless Personal  Area Networks – IEEE  802.15.4 
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Cps 750 Wireless Networking 2 WPANs Wireless Personal Area Networks: short range infrastructure-less  wireless networks, sometimes formed in an ad hoc manner, often  operated under limited power. IEEE 802.15 defines several WPAN types. 802.15.1 (Bluetooth) is the medium rate WPAN for cable replacement  and consumer networking. 802.15.3 is the high rate WPAN for real time and multimedia  applications. 802.15.4 is the low rate WPAN for low complexity, low power  connectivity among portable and mobile devices. Important application area for low rate WPANs: sensor networks.
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Cps 750 Wireless Networking 3  General description Wireless Personal Area Networks (WPANs) are used to convey information over relatively short distances. Unlike Wireless Local Area Networks (WLANs), connections effected via WPANs involve little or no infrastructure. This allows small, power efficient, inexpensive solutions to be implemented for a wide range of devices. P802.15.4 provides a standard for ultra low complexity, ultra low cost, ultra low power consumption and low data rate wireless connectivity among inexpensive devices. The raw data rate will be high enough (maximum of 250 kb/s) to satisfy a set of simple needs such as interactive toys, but scalable down to the needs of sensor and automation needs (20 kb/s or below) for wireless communications.
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Cps 750 Wireless Networking 4 General description Some of the characteristics of an LR-WPAN are: — Over air data rates of 250 kb/s, 40 kb/s, and 20 kb/s. — Star or Peer-to-Peer operation. — Allocated 16-bit short or 64-bit extended addresses. — Allocation of guaranteed time slots. — CSMA-CA channel access. — Fully acknowledged protocol for transfer reliability. -- Transfer without acknowledgement in some cases. — Low power consumption. — Energy detection and link quality indication ( aPhysical layer) — 16 channels in the 2450 MHz band, 10 channels in the 915MHz band, and 1 channel in the 868MHz band
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5 Components of IEEE 802.15.4 WPAN There are two different device types that can participate in an LR-WPAN network, a full function device (FFD) and a reduced function device (RFD). The FFD can operate in three modes serving either as a PAN coordinator, a coordinator or a device. An FFD can talk to RFDs or other FFDs, while an RFD can only talk to an FFD. An RFD is intended for applications that are extremely simple, such as a light switch or a passive infrared sensor, they do not have the need to send large amounts of data and may only associate with a single FFD at a time.
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802.15.4 - AreaNetworksIEEE 802.15.4 1 WPANs :...

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