## 2 Overview of Existing Wireless Standards and Protocols
\begin{table}
\begin{tabular}{|c|c|c|c|c|c|c|c|} \hline
**Item** & \multicolumn{2}{c|}{**Protocols**} & \multicolumn{4}{c|}{**Standards**} \\ \hline  & **TSMP** & **802.15.4e** & **WISA** & **ZigBEC Pro** & **WirelessHART** & **WIA-PA** & **ISA100.11a** \\ \hline System & & Flexible & Fixed timeslot & Flexible & All slots are 10 ms & All slots are 10 ms & Confurable time \\ management: & & & duration, 64 and & & & & duration: Timeslot \\ Timeslot & & & 128 μs & & & & duration is set by the system manager to a \\ Duration & & & & & & & \\  & & & & & & & \\  & & & & & & & \\ \hline Important & Solves the time & Low Power & High data rate, & Scalability & Low Power & Reliability, Using & Scalability, Reliability, \\ Strength problem & synchronization problem & Consumption, & Minimum delay, & Consumption, & Arri for & Robustness, Coexistence & with other, Integration \\  & in a more energy- & Reliability, & Robustness, Enhance & & Robustness, & communications, & with internet, Low \\  & relying on ACKs to & and add functionality & & Multipath routing, & Two-level packet & Power Consumption and \\  & exchange timing offset & to the 802.15.4-2006 & & & Coexistence with & aggregation & Energy savings \\  & information, Multipath & MAC to better & & & other & (adjustuate transmission \\  & routing & support the industrial & & & & power of individual \\  & markets & & & & & nodes), Multipath routing, \\  & & & & & & \\ \hline Important & Dependent to the & TSMP Drawback & Interoperability, & Reliability, Multipath routing, & Scalability, Using & Proving by & Using blind channel \\ Drawback & Centralized System & Multipath routing & routing, Realline, & blind channel & synchronization by & hopping and not using \\  & Management, In the case & & Robustness, Beacon & hopping and not & beacon & ACI, Lack of \\  & of Distributed & & transmission not & using ACI, Lack of & transmission, & centralized Distributed \\  & Management, a & & permuted in mesh & centralized network & Supporting hybrid & network management \\  & mechanism is missing & & networks and introduces & management & topology, & algorithm as well as \\  & which allows each pair & & a larger overhead in & algorithm & Multipath routing, & node’s transmission \\  & of neighbor nodes to & & terms of higher energy & Lack of & power adjustment \\  & agree on cells to & & consumption as the radio & centralizedDistrib & algorithm \\  & communicate on & & needs to remain in listen & & used network & \\  & & & mode for long periods & & management \\  & & & & algorithm & \\ \hline \end{tabular}
\end{table} 
Table 1: _Cont._ISA100.11a has been developed by the ISA100 standard committee, which is a part of the International Society of Automation (ISA). ISA100.11a uses IPv6 over Low power WPAN (6 LoWPAN) protocol in the network layer. The 6 LoWPAN was originally targeted at IEEE 802.15.4 radio standards assuming layer-2 mesh forwarding capability. Using the 6 LoWPAN protocol in the network layer in ISA100.11a allows IP-based communication over IEEE 802.15.4. ISA100.11a uses a synchronized mesh protocol (based on TSMP) in the data link layer which allows peer-to-peer communication and mesh forwarding. This makes every node in the sensor network directly accessible through the Internet. WISA, WirelessHART, WIA-PA and Zigbee Pro do not have the capability to provide such access. Table 1 summarizes the main features of TSMP, IEEE 802.15.4e, WISA, ZigBee pro, WirelessHART, WIA-PA, and ISA100.11a, as well as their important strengths and drawbacks.