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To be able to counteract propagation delays, a guard-time (Tg) is also added. In MS-Aloha, Layer-1 is not specified but is presupposed to be the identical of IEEE 802.11p. Worthily, 802.11p supplies the PLCP sub-layer which allows frame detection and alignment, required to recover from propagation delays as high as guard-time Tg. Therefore, within the receiver’s notion, every MS-Aloha body floats inside the boundaries of the perfect time-slot, and PLCP is required to properly recuperate the start of each MS-Aloha body.
Any physical layer (PLCP, PMD) can be utilized, in particular, the same as IEEE 802.11p. MS-Aloha and IEEE 802.11p can be utilized in different frequencies with the same radio entrance-end. To realize the next compliance to IEEE 802.11p and no matter a exact software of ISO/OSI paradigm, FI might be moved inside higher layers, without any major impacts on the overall operate. The nested Layer-2 information corresponds to the classical 802.11p body with just one foremost modification: in MS-Aloha a short identifier of the node (STI - 8 bit) is used contained in the FI as a substitute of MAC deal with, which is usually 48-bit lengthy.
MS-Aloha adopts a distinct approach and subtends the following hypotheses and rules which, mainly, define all its fundamental mechanisms.
Considering the everyday taxonomy of MAC protocols, MS-Aloha represents a hybrid solution. However, solely the latter case represents a real alternative to IEEE 802.
