802.15.4e

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802.15.4e 

802.15.4e for industrial applications and 802.15.4g for the smart utility networks (SUN)

 The 802.15.4e improves the old standard by introducing mechanisms such as time slotted access, multichannel communication and channel hopping.

• IEEE 802.15.4e introduces the following general functional enhancements:

 1. Low Energy (LE): This mechanism is intended for applications that can trade latency for energy efficiency. It allows a node to operate with a very low duty cycle.

 2. Information Elements (IE) It is an extensible mechanism to exchange information at the MAC sublayer. 

3. Enhanced Beacons (EB): Enhanced Beacons are an extension of the 802.15.4 beacon frames and provide a greater flexibility. They allow to create application-specific frames.

4. Multipurpose Frame: This mechanism provides a flexible frame format that can address a number of MAC operations. It is based on IEs.

5. MAC Performance Metric: It is a mechanism to provide appropriate feedback on the channel quality to the networking and upper layers, so that appropriate decision can be taken.

6. Fast Association (FastA) The 802.15.4 association procedure introduces a significant delay in order to save energy. For time-critical application latency has priority over energy efficiency.

• IEEE 802.15.4e defines five new MAC behavior modes.

1. Time Slotted Channel Hopping (TSCH): It targets application domains such as industrial automation and process control, providing support for multi-hop and multichannel communications, through a TDMA approach.

2. Deterministic and Synchronous Multi-channel Extension (DSME): It is aimed to support both industrial and commercial applications.

 3. Low Latency Deterministic Network (LLDN): Designed for single-hop and single channel networks

 4. Radio Frequency Identification Blink (BLINK): It is intended for application domains such as item/people identification, location and tracking.

 5. Asynchronous multi-channel adaptation (AMCA): It is targeted to application domains where large deployments are required, such as smart utility networks, infrastructure monitoring networks, and process control networks.

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