The primary purpose of the Internet MANET Encapsulation Protocol (IMEP) is to improve overall network performance by reducing the No. of network control packet broadcasts through encapsulation and aggregation of multiple MANET control packets (e.g. routing protocol packets, acknowledgements, link status sensing packets, ``network-level" address resolution, etc.) into larger IMEP messages. Usage of the IMEP is desirable because per-message, multiple access delay in contention-based schemes such as CSMA/CA, IEEE 802.11, FAMA etc. is significant, and thus favors the use of fewer, larger messages. It also may be useful in reservation-based, time-slotted access schemes where smaller packets must be aggregated into appropriately-sized IP packets for transmission in a given time slot. Upper Layer Protocols (ULP) *other than routing* may make use of this encapsulation functionality for the same purpose.
you can find more here: An Internet MANET Encapsulation Protocol (IMEP) Specification
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