The 6LoWPAN Adaptation Layer
Before digging into the IP protocols developed for smart object networks, several terms that may be confusing need to be defined. According to  a LoWPAN is Low-power Wireless Personal Area Networks (LoWPANs) composed of devices conforming to the IEEE 802.15.4-2003 standard defined by the IEEE . IEEE 802.15.4 devices are characterized by short range, low bit rate, low power, and low cost.
IEEE 80.15.4 networks have the following characteristics:
• Small packet size (the maximum transmission unit or MTU on IEEE 802.15.4 links is 127 bytes), which provides even less room for data when including other headers (as discussed in detail in Section 16.2).
• Support for both 16-bit short ...